JP6801341B2 - Resin composition and resin molded product - Google Patents

Description

The present invention relates to a resin composition and a resin molded product.

Conventionally, various resin compositions have been provided and used for various purposes.
In particular, resin compositions containing polyolefin as a thermoplastic resin are used for various parts of home appliances and automobiles, housings, and parts such as office equipment and housings of electronic and electrical equipment.

For example, Patent Document 1 states that "(a) 0.1 to 90% by weight of at least one type of polyolefin, (b) 0.1 to 50% by weight of at least one type of polyamide, and (c) 0.1 to 0.1. 15% by weight of at least one modified polyolefin, (d) 5.0 to 75% by weight of at least one reinforcing fiber, (e) 0.1 to 10% by weight of at least one sulfur-containing additive. A long fiber reinforced polyolefin structure having a length of 3 mm or more including the above is disclosed.

Further, Patent Document 2 states that "an acid-modified polyolefin (A) block and a polyamide (B) block are provided, and carbon derived from an amide group by ¹³ C-NMR and carbon derived from a methyl group, a methylene group and a methine group are used. A modifier for a polyolefin resin containing a polymer (X) having a ratio (α) of 0.5 / 99.5 to 12/88 ”is disclosed. Further, Patent Document 2 discloses "an inorganic fiber-containing polyolefin resin composition containing the modifier (K) for a polyolefin resin, a polyolefin resin (D) and an inorganic fiber (E)." ..

Further, Patent Document 3 states, "In a thermoplastic resin molded product containing carbon fibers, the total content of the carbon fibers contained in the molded product is 0.5 to 30 wt%, further exceeding 1.5 mm. A carbon fiber-containing thermoplastic resin molded article characterized in that the length of the carbon fiber is 0.1 to 4.7 wt%. "

Special Table 2003-528965 Japanese Unexamined Patent Publication No. 2014-181307 Japanese Unexamined Patent Publication No. 2000-071245

An object of the present invention is that in a resin composition containing a polyolefin, carbon fibers, a resin containing at least one of an amide bond and an imide bond, and a compatibilizer, the content of the resin containing at least one of the amide bond and the imide bond is determined. When the amount is 20 parts by mass or less with respect to 100 parts by mass of the polyolefin, or a part of the resin containing at least one of the amide bond and the imide bond forms a domain having a diameter of less than 0.1 μm or more than 10 μm in the polyolefin. It is an object of the present invention to provide a resin composition capable of obtaining a resin molded body having an excellent bending elasticity as compared with the case of the above.

The above object is achieved by the following invention.

The invention according to < 1 > is
With polyolefin
With carbon fiber
A resin containing at least one of an amide bond and an imide bond, wherein the content with respect to 100 parts by mass of the polyolefin is more than 20 parts by mass and 100 parts by mass or less.
With a compatibilizer,
Including
A resin composition in which a part of a resin containing at least one of the amide bond and the imide bond forms a domain having a diameter of 0.1 μm or more and 10 μm or less in the polyolefin.

The invention according to < 2 > is
The resin composition according to < 1 > , wherein a part of the resin containing at least one of the amide bond and the imide bond forms a coating layer around the carbon fiber.

The invention according to < 3 > is
The resin composition according to < 2, wherein a layer of the compatibilizer is interposed between the coating layer and the polyolefin.

The invention according to < 4 > is
The resin composition according to any one of < 1 > to < 3 > , wherein the resin containing at least one of the amide bond and the imide bond is a polyamide.

The invention according to < 5 > is
The resin composition according to any one of < 1 > to < 4 > , wherein the compatibilizer is a modified polyolefin.

The invention according to < 6 > is
The resin composition according to any one of < 1 > to < 5 > , wherein the average fiber length of the carbon fibers is 0.1 mm or more and 2.5 mm or less.

The invention according to < 7 > is
The resin composition according to any one of < 1 > to < 6 > , wherein the content of the carbon fibers is 0.1 part by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the polyolefin.

The invention according to < 8 > is
The item according to any one of < 1 > to < 7 > , wherein the content of the compatibilizer is 1 part by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the resin containing at least one of the amide bond and the imide bond. Resin composition.

The invention according to < 9 > is
The item according to any one of < 1 > to < 8 > , wherein the content of the resin containing at least one of the amide bond and the imide bond with respect to the mass of the carbon fiber is 0.1% by mass or more and 200% by mass or less. Resin composition.

The invention according to < 10 > is
The resin composition according to any one of < 1 > to < 9 > , wherein the content of the compatibilizer with respect to the mass of the carbon fibers is 1% by mass or more and 100% by mass or less.

The invention according to < 11 > is
With polyolefin
With carbon fiber
A resin containing at least one of an amide bond and an imide bond, wherein the content with respect to 100 parts by mass of the polyolefin is more than 20 parts by mass and 100 parts by mass or less.
With a compatibilizer,
Including
A resin molded product in which a part of a resin containing at least one of the amide bond and the imide bond forms a domain having a diameter of 0.1 μm or more and 10 μm or less in the polyolefin.

The invention according to < 12 > is
The resin molded product according to < 11 > , wherein a part of the resin containing at least one of the amide bond and the imide bond forms a coating layer around the carbon fiber.

The invention according to < 13 > is
The resin molded product according to < 12 > , wherein a layer of the compatibilizer is interposed between the coating layer and the polyolefin.

The invention according to < 14 > is
The resin molded product according to any one of < 11 > to < 13 > , wherein the resin containing at least one of the amide bond and the imide bond is polyamide.

The invention according to < 15 > is
The resin molded product according to any one of < 11 > to < 14 > , wherein the compatibilizer is a modified polyolefin.

The invention according to < 16 > is
The resin molded product according to any one of < 11 > to < 15 > , wherein the average fiber length of the carbon fibers is 0.1 mm or more and 2.5 mm or less.

The invention according to < 17 > is
The resin molded product according to any one of < 11 > to < 16 > , wherein the content of the carbon fibers is 0.1 part by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the polyolefin.

The invention according to < 18 > is
The item according to any one of < 11 > to < 17 > , wherein the content of the compatibilizer is 1 part by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the resin containing at least one of the amide bond and the imide bond. Resin molded body.

The invention according to < 19 > is
The item according to any one of < 11 > to < 18 > , wherein the content of the resin containing at least one of the amide bond and the imide bond with respect to the mass of the carbon fiber is 0.1% by mass or more and 200% by mass or less. Resin molded body.

The invention according to < 20 > is
The resin molded product according to any one of < 11 > to < 19 > , wherein the content of the compatibilizer with respect to the mass of the carbon fibers is 1% by mass or more and 100% by mass or less.

According to the invention according to < 1 > , in a resin composition containing a polyolefin, a carbon fiber, a resin containing at least one of an amide bond and an imide bond, and a compatibilizer, a resin containing at least one of the amide bond and the imide bond. When the content of the resin is 20 parts by mass or less with respect to 100 parts by mass of the polyolefin, or a part of the resin containing at least one of the amide bond and the imide bond is less than 0.1 μm or more than 10 μm in the polyolefin. Provided is a resin composition capable of obtaining a resin molded body having an excellent bending elasticity as compared with the case of forming the above.
According to the invention according to < 2 > , a resin molded product having an excellent flexural modulus is higher than that in the case where the resin containing at least one of the amide bond and the imide bond does not form a coating layer around the carbon fibers. The resulting resin composition is provided.
According to the invention according to < 3 >, there is provided a resin composition capable of obtaining a resin molded product having an excellent flexural modulus as compared with the case where a layer of a compatibilizer is not interposed between the coating layer and the polyolefin. Will be done.
According to the invention according to < 4 >, there is provided a resin composition capable of obtaining a resin molded product having an excellent flexural modulus as compared with the case where imidazole is used as a resin containing at least one of an amide bond and an imide bond.
According to the invention according to < 5 >, there is provided a resin composition capable of obtaining a resin molded product having an excellent flexural modulus as compared with the case where an epoxy copolymer is used as a compatibilizer.
According to the invention according to < 6 > , in a resin composition containing a polyolefin, a carbon fiber, a resin containing at least one of an amide bond and an imide bond, and a compatibilizer, a resin containing at least one of the amide bond and the imide bond. When the content of the resin is 20 parts by mass or less with respect to 100 parts by mass of the polyolefin, or a part of the resin containing at least one of the amide bond and the imide bond has a diameter of less than 0.1 μm or more than 10 μm in the polyolefin. Provided is a resin composition capable of obtaining a resin molded product containing carbon fibers having an average fiber length of 0.1 mm or more and 2.5 mm or less and having an excellent bending elasticity as compared with the case of forming the above.

According to the invention according to < 7 > , the formability is excellent and the flexural modulus is excellent as compared with the case where the carbon fiber content is less than 0.1 part by mass or more than 200 parts by mass with respect to 100 parts by mass of polyolefin. A resin composition for obtaining a resin molded product is provided.
According to the invention according to < 8 > , the content of the compatibilizer is less than 1 part by mass or more than 100 parts by mass with respect to 100 parts by mass of the resin containing at least one of the amide bond and the imide bond. Provided is a resin composition capable of obtaining a resin molded product having an excellent elastic modulus.
According to the invention according to < 9 > , the content of the resin containing at least one of the amide bond and the imide bond with respect to the mass of the carbon fiber is less than 0.1% by mass or more than 200% by mass, as compared with the case where the resin is bent. Provided is a resin composition capable of obtaining a resin molded product having an excellent elastic modulus.
According to the invention according to < 10 > , a resin molded product having an excellent flexural modulus is higher than that in the case where the content of the compatibilizer with respect to the mass of the carbon fiber is less than 1% by mass or more than 100% by mass. The resulting resin composition is provided.

According to the invention according to < 11 > , in a resin molded product containing a polyolefin, a carbon fiber, a resin containing at least one of an amide bond and an imide bond, and a compatibilizer, a resin containing at least one of the amide bond and the imide bond. When the content of the resin is 20 parts by mass or less with respect to 100 parts by mass of the polyolefin, or a part of the resin containing at least one of the amide bond and the imide bond is less than 0.1 μm or more than 10 μm in the polyolefin. A resin molded body having an excellent bending elasticity as compared with the case of forming the above is provided.
According to the invention according to < 12 > , a resin molded product having an excellent flexural modulus is higher than that in the case where the resin containing at least one of the amide bond and the imide bond does not form a coating layer around the carbon fibers. Provided.
According to the invention according to < 13 > , a resin molded product having an excellent flexural modulus is provided as compared with the case where a layer of a compatibilizer is not interposed between the coating layer and the polyolefin.
According to the invention according to < 14 > , a resin molded product having an excellent flexural modulus is provided as compared with the case where imidazole is used as the resin containing at least one of an amide bond and an imide bond.
According to the invention according to < 15 > , a resin molded product having an excellent flexural modulus is provided as compared with the case where an epoxy copolymer is used as a compatibilizer.
According to the invention according to < 16 > , in a resin molded product containing a polyolefin, carbon fibers, a resin containing at least one of an amide bond and an imide bond, and a compatibilizer, a resin containing at least one of the amide bond and the imide bond. When the content of the resin is 20 parts by mass or less with respect to 100 parts by mass of the polyolefin, or a part of the resin containing at least one of the amide bond and the imide bond has a diameter of less than 0.1 μm or more than 10 μm in the polyolefin. Provided is a resin molded body containing carbon fibers having an average fiber length of 0.1 mm or more and 2.5 mm or less and having an excellent bending elasticity as compared with the case of forming the above.

According to the invention according to < 17 > , the formability is excellent and the flexural modulus is excellent as compared with the case where the carbon fiber content is less than 0.1 part by mass or more than 200 parts by mass with respect to 100 parts by mass of polyolefin. A resin molded product is obtained.
According to the invention according to < 18 > , the content of the compatibilizer is less than 1 part by mass or more than 100 parts by mass with respect to 100 parts by mass of the resin containing at least one of the amide bond and the imide bond. Provided is that a resin molded product having an excellent elastic modulus can be obtained.
According to the invention according to < 19 > , the content of the resin containing at least one of the amide bond and the imide bond with respect to the mass of the carbon fiber is less than 0.1% by mass or more than 200% by mass, as compared with the case where the resin is bent. Provided is a resin molded product having an excellent elastic modulus.
According to the invention of < 20 > , a resin molded product having an excellent flexural modulus is provided as compared with the case where the content of the compatibilizer with respect to the mass of the carbon fiber is less than 1% by mass or more than 100% by mass. Will be done.

It is a model figure which shows the main part of the resin molded body which concerns on this embodiment. It is a schematic diagram for demonstrating an example of the main part of the resin molded article which concerns on this embodiment. It is a schematic diagram of the test using the microdroplet method.

Hereinafter, embodiments that are examples of the resin composition and the resin molded product of the present invention will be described.

[Resin composition]
The resin composition according to the present embodiment contains a polyolefin, carbon fibers, a resin containing at least one of an amide bond and an imide bond, and a compatibilizer. The content of the resin containing at least one of the amide bond and the imide bond is such that the content with respect to 100 parts by mass of the polyolefin is more than 20 parts by mass and 100 parts by mass or less. Further, a part of the resin containing at least one of the amide bond and the imide bond forms a domain having a diameter of 0.1 μm or more and 10 μm or less in the polyolefin.
Hereinafter, a resin containing at least one of an amide bond and an imide bond may be referred to as a "specific resin".

In recent years, in order to obtain a resin molded product having excellent mechanical strength, a resin composition containing polyolefin as a base material (matrix) and reinforcing fibers has been used.
In such a resin composition, if the affinity between the reinforcing fiber and the polyolefin is low, a space is formed at the interface between the reinforcing fiber and the polyolefin, and the adhesion at the interface may be lowered.
In particular, when carbon fiber is used as the reinforcing fiber in the resin composition, higher mechanical strength is required as compared with glass fiber or the like, but the polarity that contributes to adhesion to polyolefin such as hydroxyl group and carboxyl group on the surface of carbon fiber. Since the number of groups is smaller than that of glass fiber, the adhesion at the interface between the carbon fiber and the polyolefin is lowered. As a result, the mechanical strength, particularly the flexural modulus, is unlikely to increase for the composition of the carbon fibers. In particular, when a load of repeated bending is applied, peeling at the interface between the carbon fiber and the polyolefin tends to proceed, so that the bending elastic modulus tends to decrease significantly from the initial stage.

Therefore, the resin composition according to the present embodiment contains four components of a polyolefin, carbon fibers, a resin containing at least one of an amide bond and an imide bond (specific resin), and a compatibilizer. In addition, the content of the specific resin with respect to 100 parts by mass of polyolefin is set to more than 20 parts by mass and 100 parts by mass or less.
With this configuration, a resin molded body having an excellent flexural modulus can be obtained. The action to obtain such an effect is not clear, but it is presumed as follows.

When a resin molded product is obtained from the resin composition according to the present embodiment, when the resin composition is thermally melt-mixed, the polyolefin as the base material and the compatibilizer are melted, and one of the compatibilizers in the molecule. The portion and the amide bond or the imide bond contained in the molecule of the specific resin are compatible with each other, and the specific resin is dispersed in the resin composition.
In this state, when the specific resin comes into contact with the carbon fiber, the amide bond or imide bond contained in large numbers along the molecular chain of the specific resin and the polar group slightly present on the surface of the carbon fiber have an affinity (attractive force). And hydrogen bonds) to physically bond at multiple points. Further, since the compatibility between the polyolefin and the specific resin is generally low, the repulsive force between the polyolefin and the specific resin increases the contact frequency between the specific resin and the carbon fiber, and as a result, the specific resin has a low compatibility with the carbon fiber. The amount of adhesion and the area of adhesion increase. In this way, a coating layer made of the specific resin is formed around the carbon fibers (see FIG. 1). In FIG. 1, PP indicates polyolefin, CF indicates carbon fiber, and CL indicates a coating layer.
Then, the specific resin forming the coating layer is also compatible with some reactive groups in the molecule of the compatibilizer by performing a chemical reaction and electrostatic interaction between the polar groups, so that the compatibilizer is used. By being compatible with polyolefin, an equilibrium state is formed between the attractive force and the repulsive force, and the coating layer made of the specific resin is formed in a thin and nearly uniform state. In particular, since the carboxy group existing on the surface of the carbon fiber has a high affinity for the amide bond or the imide bond contained in the molecule of the specific resin, a coating layer made of the specific resin is likely to be formed around the carbon fiber, resulting in a thin film. It is considered that the coating layer is excellent in uniformity.

On the other hand, by including a large amount of the specific resin having such an action in the range of more than 20 parts by mass and 100 parts by mass or less with respect to 100 parts by mass of the polyolefin, the amount of the compatibilizer can be increased relative to the amount of the specific resin. The amount is reduced, the specific resin is less likely to spread in the polyolefin, and the tendency to be localized around the carbon fiber is increased. As a result, it is considered that the coating layer made of the specific resin is formed in a nearly uniform state while being thickened to some extent over the entire circumference of the carbon fibers.
The coating layer preferably covers the entire periphery of the carbon fiber, but there may be a partially uncoated portion.

Further, a part of the specific resin forms a domain having a diameter in the above range in the polyolefin, that is, the specific resin that is free does not contribute to the formation of the coating layer and is finely dispersed in the polyolefin. And the mechanical strength, especially the flexural modulus is improved. This is because 1) the domain of the specific resin dispersed in the polyolefin plays a role of dispersing the mechanical load such as bending, and 2) the domain of the specific resin is fine and the stress on the interface between the domain of the specific resin and the polyolefin This is because it is thought that the concentration is eased.

From the above, since the adhesion of the interface between the carbon fiber and the polyolefin is enhanced and the specific resin is finely dispersed in the polyolefin, a resin molded product having excellent mechanical strength, particularly bending elastic modulus, can be obtained. It is presumed.

Further, since a part of the specific resin forms a domain having a diameter in the above range in the polyolefin, the moldability is also improved.

Here, when the fiber length of the carbon fiber is shortened, the resin reinforcing ability of the carbon fiber tends to decrease. In particular, in recent years, due to the demand for recycling, the resin molded product reinforced with carbon fibers has been crushed and reused, and the fiber length of the carbon fiber is often shortened when the resin molded product is crushed. .. In addition, the fiber length of the carbon fibers may be shortened during heat melt kneading during the production of the resin composition. Therefore, when a resin molded product is molded from a resin composition containing carbon fibers having a shortened fiber length, the mechanical strength, particularly the flexural modulus, tends to decrease.
However, even if the resin molded body containing the carbon fibers is crushed and a recycled product in which the carbon fibers are shortened is used as a raw material, or the carbon fibers are shortened during hot melt kneading, the resin composition according to the present embodiment. The material is useful because a resin molded body having an excellent bending elasticity can be obtained.

Here, the resin composition according to the present embodiment and the resin molded product obtained by the resin composition are made of a specific resin around the carbon fibers by heat melt kneading and injection molding during the production of the resin composition (for example, pellets). It is preferable that the coating layer is formed and has a structure in which the thickness of the coating layer is 50 nm or more and 700 nm or less.

In the resin composition according to the present embodiment, the thickness of the coating layer made of the specific resin is 50 nm or more and 700 nm or less, and is preferably 50 nm or more and 650 nm or less from the viewpoint of further improving the flexural modulus. When the thickness of the coating layer is 50 nm or more, the flexural modulus is improved, and when the thickness of the coating layer is 700 nm or less, the interface between the carbon fiber and the polyolefin via the coating layer is suppressed from becoming brittle, and the flexural modulus is suppressed. The decrease is suppressed.

The thickness of the coating layer is a value measured by the following method. The object to be measured is broken in liquid nitrogen, and its cross section is observed using an electron microscope (VE-9800 manufactured by Keyence Corporation). In the cross section, the thickness of the coating layer covering around the carbon fiber is measured at 100 points and calculated as the average value.
The coating layer is confirmed by observing the cross section.

In the resin composition according to the present embodiment and the resin molded product obtained thereby, the diameter of the domain of the specific resin in the polyolefin is 0.1 μm or more and 10 μm or less, but from the viewpoint of further improving the flexural modulus. , 0.5 μm or more and 5 μm or less is preferable.

The diameter of the domain of the specific resin in the polyolefin is, for example, 1) increase / decrease in the content of the compatibilizer, 2) adjustment of the heat melt kneading temperature and molding temperature, and 3) heat melt kneading, mixing force or dispersion during molding. It is adjusted by force.

The diameter of the domain of the specific resin is a value measured by the following method.
That is, the sample piece of the object to be measured is embedded in epoxy resin, and a precision polishing cross section is prepared by an automatic polishing machine (Vector manufactured by BUEHLER).
Next, using SEM (Hitachi S-3400N, accelerating voltage 15KV), the polished cross section of the sample piece was randomly photographed in three fields at a magnification of 1500 times, and carbon of the specific resin was photographed using image analysis software (ImageProPlus). The brightness range is set so as to extract all the coating layer component and the free component (corresponding to the domain of the specific resin) of the fiber.
After that, the coating layer component is manually selected and excluded, and the diameter and the number of objects are selected and calculated with only the free component (corresponding to the domain of the specific resin) as the measurement item, and the size of each domain (diameter = equivalent circle diameter). ) And the number, and from this, the average value of the size (diameter) of the domain is calculated.

In the resin composition (and its resin molded product) according to the present embodiment, for example, the compatibilizer is partially compatible between the coating layer and the polyolefin.
Specifically, for example, a layer of a compatibilizer may be interposed between the coating layer made of the specific resin and the polyolefin as the base material (see FIG. 2). That is, it is preferable that a layer of the compatibilizer is formed on the surface of the coating layer, and the coating layer and the polyolefin are adjacent to each other via the layer of the compatibilizer. The layer of the compatibilizer is formed thinner than the coating layer, but the presence of the compatibilizer layer enhances the adhesion (adhesiveness) between the coating layer and the polyolefin, and is excellent in mechanical strength, especially flexural modulus. It becomes easy to obtain a resin molded product. In FIG. 2, PP indicates polyolefin, CF indicates carbon fiber, CL indicates a coating layer, and CA indicates a compatibilizer layer.

In particular, the layer of the compatibilizer is bonded to the coating layer (hydrogen bond, covalent bond by the reaction of the functional group of the compatibilizer and the specific resin, etc.) and is compatible with the polyolefin, and the coating layer and the polyolefin are in a state of being compatible with each other. It is good to intervene between. In this configuration, for example, as a compatibilizer, a phase having the same structure or a compatible structure as the polyolefin as the base material, and including a part in the molecule that reacts with the functional group of the specific resin described above. It is easy to realize by applying a solubilizer.
Specifically, for example, when a polyolefin, a polyamide as a specific resin, and a maleic anhydride-modified polyolefin are applied as a compatibilizer, the layer of the maleic anhydride-modified polyolefin (layer of the compatibilizer) is the maleic anhydride moiety. It is preferable that the carboxy group generated by opening the ring reacts with the amine residue of the polyamide layer (coating layer) to bond, and the polyolefin moiety is interposed in a state of being compatible with the polyolefin.

Here, the method for confirming that the layer of the compatibilizer is interposed between the coating layer and the polyolefin is as follows.
An infrared spectroscopic analyzer (NICOLET 6700FT-IR manufactured by Thermo Fisher Scientific Co., Ltd.) is used as the analysis apparatus. For example, in the case of a resin composition (or resin molded product) of polypropylene (hereinafter PP) as a polyolefin, PA66 as a polyamide and maleic acid-modified polypropylene (hereinafter MA-PP) as a modified polyolefin, a mixture thereof, or a mixture of PP and PA66. , PP and MA-PP mixture, as a reference, the IR spectra of PP alone, PA66 alone, and MA-PP alone were obtained by the KBr tablet method and derived from acid anhydride (peak characteristic of MA-PP) in the mixture. comparative analysis of the peak area of the wave number 1820 cm ^-1 or 1750 cm ^-1 or less. In the mixture of PP, PA66 and MA-PP, a decrease in the peak area of acid anhydride is confirmed, and it is confirmed that MA-PP and PA66 are reacting. From this, it can be confirmed that a layer of the compatibilizer (bonding layer) is interposed between the coating layer and the polyolefin. Specifically, when MA-PP and PA66 are reacting, the cyclic maleinated portion of MA-PP is ring-opened and the amine residue of PA66 is chemically bonded to reduce the cyclic maleated portion. It can be confirmed that a layer of the compatibilizer (bonding layer) is interposed between the polypropylene and the polyolefin.

Hereinafter, details of each component of the resin composition according to the present embodiment will be described.

-Polyolefin (A)-
Polyolefin is a base material of a resin composition and is a resin component reinforced by carbon fibers (also called a matrix resin).
One type of polyolefin may be used alone, or two or more types may be used in combination.

The polyolefin is a resin containing a repeating unit derived from an olefin, and may contain a repeating unit derived from a monomer other than the olefin as long as it is 30% by mass or less with respect to the entire resin.
Polyolefins are obtained by addition polymerization of olefins (optionally non-olefin monomers).
Further, the olefin and the monomers other than the olefin for obtaining the polyolefin may be one kind or two or more kinds, respectively.
The polyolefin may be a copolymer or a homopolymer. Further, the polyolefin may be linear or branched.

Here, examples of the olefin include a linear or branched aliphatic olefin and an alicyclic olefin.
Examples of the aliphatic olefin include α-olefins such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-hexadecene and 1-octadecene.
Examples of the alicyclic olefin include cyclopentene, cycloheptene, norbornene, 5-methyl-2-norbornene, tetracyclododecene, vinylcyclohexane and the like.
Among them, from the viewpoint of cost, α-olefin is preferable, ethylene and propylene are more preferable, and propylene is particularly preferable.

The monomer other than the olefin is selected from known addition-polymerizable compounds.
Examples of the addition polymerizable compound include styrenes such as styrene, methylstyrene, α-methylstyrene, β-methylstyrene, t-butylstyrene, chlorostyrene, chloromethylstyrene, methoxystyrene, styrenesulfonic acid or a salt thereof; (Meta) acrylic acid esters such as alkyl (meth) acrylate, benzyl (meth) acrylate, dimethylaminoethyl (meth) acrylate; halovinyls such as vinyl chloride; vinyl esters such as vinyl acetate and vinyl propionate; Vinyl ethers such as vinyl methyl ether; halogenated vinylidene such as vinylidene chloride; N-vinyl compounds such as N-vinylpyrrolidone; and the like can be mentioned.

Suitable polyolefins include polypropylene (PP), polyethylene (PE), polybutene, polyisobutylene, kumaron-inden resin, terpene resin, ethylene-vinyl acetate copolymer resin (EVA) and the like.
Of these, a resin containing only a repeating unit derived from an olefin is preferable, and polypropylene is particularly preferable from the viewpoint of cost.

The molecular weight of the polyolefin is not particularly limited, and may be determined according to the type of resin, molding conditions, application to the resin molded product, and the like. For example, the weight average molecular weight (Mw) of polyolefin is preferably in the range of 10,000 or more and 300,000 or less, and more preferably in the range of 10,000 or more and 200,000 or less.
Further, the glass transition temperature (Tg) or melting point (Tm) of the polyolefin is not particularly limited as in the above molecular weight, and may be determined according to the type of resin, molding conditions, application to the resin molded product, and the like. For example, the melting point (Tm) of the polyolefin is preferably in the range of 100 ° C. or higher and 300 ° C. or lower, and more preferably in the range of 150 ° C. or higher and 250 ° C. or lower.

The weight average molecular weight (Mw) and melting point (Tm) of the polyolefin show the values measured as follows.
That is, the weight average molecular weight (Mw) of the polyolefin is determined by gel permeation chromatography (GPC) under the following conditions. A high-temperature GPC system "HLC-8321GPC / HT" is used as the GPC apparatus, and o-dichlorobenzene is used as the eluent. The polyolefin is once melted and filtered into o-dichlorobenzene at a high temperature (temperature of 140 ° C. or higher and 150 ° C. or lower), and the filtrate is used as a measurement sample. The measurement conditions were a sample concentration of 0.5% and a flow velocity of 0.6 ml / min. , Sample injection volume 10 μl, using an RI detector. The calibration curve is "polystylene standard sample TSK standard" manufactured by Tosoh Corporation: "A-500", "F-1", "F-10", "F-80", "F-380", "A-". It is prepared from 10 samples of "2500", "F-4", "F-40", "F-128", and "F-700".
Further, the melting point (Tm) of the polyolefin is determined from the DSC curve obtained by differential scanning calorimetry (DSC), as described in "Melting peak" described in "Method for measuring transition temperature of plastics" of JIS K 7121-1987. Obtained by "temperature".

The content of the polyolefin may be determined according to the use of the resin molded product and the like. For example, the content of the polyolefin is preferably 5% by mass or more and 95% by mass or less, and 10% by mass or more and 95% by mass or more, based on the total mass of the resin composition. More preferably, it is 20% by mass or more and 95% by mass or less.

-Carbon fiber-
As the carbon fiber, a known carbon fiber is used, and both a PAN-based carbon fiber and a pitch-based carbon fiber are used.

The carbon fiber may be one that has been subjected to a known surface treatment.
Examples of the surface treatment of the carbon fiber include an oxidation treatment and a sizing treatment.
The form of the carbon fiber is not particularly limited, and may be selected depending on the intended use of the resin molded product and the like. Examples of the form of carbon fibers include fiber bundles composed of a large number of single fibers, bundles of fiber bundles, and woven fabrics in which fibers are woven two-dimensionally or three-dimensionally.

The fiber diameter, fiber length, and the like of the carbon fiber are not particularly limited, and may be selected according to the application of the resin molded product and the like.
However, even if the fiber length of the carbon fibers is short, a resin molded body having an excellent flexural modulus can be obtained. Therefore, the average fiber length of the carbon fibers is 0.1 mm or more and 2.5 mm or less (preferably 0.2 mm or more 2). It may be 0.0 mm or less).
Further, the average diameter of the carbon fibers may be, for example, 5.0 μm or more and 10.0 μm or less (preferably 6.0 μm or more and 8.0 μm or less).

Here, the method for measuring the average fiber length of carbon fibers is as follows. The carbon fibers are observed with an optical microscope at a magnification of 100, and the length of the carbon fibers is measured. Then, this measurement is performed on 200 carbon fibers, and the average value is taken as the average fiber length of the carbon fibers.
On the other hand, the method for measuring the average diameter of carbon fibers is as follows. A cross section orthogonal to the length direction of the carbon fiber is observed by an SEM (scanning electron microscope) at a magnification of 1000 times, and the diameter of the carbon fiber is measured. Then, this measurement is performed on 100 carbon fibers, and the average value thereof is taken as the average diameter of the carbon fibers.

As the carbon fiber, a commercially available product may be used.
Commercially available PAN-based carbon fibers include "Treca (registered trademark)" manufactured by Toray Industries, Inc., "Tenax" manufactured by Toho Tenax Co., Ltd., and "Pyrofil (registered trademark)" manufactured by Mitsubishi Rayon Co., Ltd. Can be mentioned. In addition, examples of commercially available PAN-based carbon fibers include commercially available products manufactured by Hexcel, Cytec, Dow-Axa, Formosa Plastics, and SGL.
Examples of commercially available pitch-based carbon fibers include "Dyriad (registered trademark)" manufactured by Mitsubishi Rayon Corporation, "GRANOC" manufactured by Nippon Graphite Fiber Co., Ltd., and "Kureka" manufactured by Kureha Corporation. .. In addition, examples of commercially available pitch-based carbon fibers include commercially available products manufactured by Osaka Gas Chemical Co., Ltd. and Cytec.

As the carbon fiber, one type may be used alone, or two or more types may be used in combination.

The content of the carbon fiber is preferably 0.1 part by mass or more and 200 parts by mass or less, more preferably 1 part by mass or more and 180 parts by mass or less with respect to 100 parts by mass of the polyolefin as the base material, and 5 parts by mass. It is more preferably 150 parts by mass or less.
The resin composition is strengthened by containing 0.1 part by mass or more of carbon fibers with respect to 100 parts by mass of polyolefin, and the content of carbon fibers is set to 200 parts by mass or less with respect to 100 parts by mass of polyolefin. As a result, the moldability when obtaining the resin molded product is improved.
When reinforcing fibers other than carbon fibers are used, it is preferable that 80% by mass or more of the reinforcing fibers is carbon fibers with respect to the total mass of the reinforcing fibers.

Here, hereinafter, the content (parts by mass) with respect to 100 parts by mass of polyolefin may be abbreviated as "phr (per hungred resin)".
When this abbreviation is used, the content of the carbon fiber is 0.1 phr or more and 200 phr or less.

-Resin containing at least one of imide bond and amide bond (specific resin)-
The specific resin is a resin that contains a specific partial structure and can coat the periphery of carbon fibers as described above.
This specific resin will be described in detail.

The specific resin is preferably a resin having low compatibility with polyolefin, specifically, a resin having a solubility parameter (SP value) different from that of polyolefin.
Here, the difference in SP value between the polyolefin and the specific resin is preferably 3 or more, and more preferably 3 or more and 6 or less, from the viewpoint of compatibility between the two and repulsive force between the two.
The SP value referred to here is a value calculated by the Fedor method. Specifically, the solubility parameter (SP value) is, for example, Polym. Eng. Sci. , Vol. 14, p. Based on the description of 147 (1974), the SP value is calculated by the following formula.
Formula: SP value = √ (Ev / v) = √ (ΣΔei / ΣΔvi)
(In the formula, Ev: evaporation energy (cal / mol), v: molar volume (cm ³ / mol), Δei: evaporation energy of each atom or atomic group, Δvi: molar volume of each atom or atomic group)
As the solubility parameter (SP value), (cal / cm ³ ) ^1/2 is adopted as the unit, but the unit is omitted according to the practice and is expressed dimensionlessly.

In addition, the specific resin contains at least one of an imide bond and an amide bond in the molecule.
By including an imide bond or an amide bond, an affinity is developed with the polar group present on the surface of the carbon fiber.
Specific types of the specific resin include thermoplastic resins having at least one of an imide bond and an amide bond in the main chain, and specifically, polyamide (PA), polyimide (PI), and polyamideimide (PAI). , Polyetherimide (PEI), polyamino acids and the like.

As the specific resin, it is preferable that the compatibility with polyolefin is low and the SP value is different. Therefore, it is preferable to use a thermoplastic resin different from that of polyolefin.
Among them, polyamide (PA) is preferable from the viewpoint of further improving the flexural modulus and excellent adhesion to carbon fibers.

Here, the adhesion between the specific resin and the carbon fiber is evaluated by an index such as interfacial shear strength.
Interfacial shear strength is measured using the microdroplet method. Here, the microdroplet method will be described with reference to the schematic diagram of the test shown in FIG.
The microdroplet method is a test in which a liquid resin is applied to a single fiber f, a droplet D (also called a resin grain or a resin ball) is attached, the droplet D is fixed, and then the single fiber f is pulled out in the direction of an arrow. This is a method of evaluating the interfacial adhesiveness between the two.
Then, based on this test, the interfacial shear strength (τ) is calculated using the following formula.

In the formula, τ represents the interfacial shear strength, F represents the pull-out load, d represents the fiber diameter of the single fiber, and L represents the droplet length.
The larger the value of the calculated interfacial shear strength (τ) is, the higher the adhesion between the carbon fiber and the specific resin is, and by selecting the combination of the carbon fiber and the specific resin having a large value, the bending is higher. It is also an index that a resin molded body having an elastic modulus is formed.

Examples of the polyamide include those obtained by copolymerizing dicarboxylic acid and diamine, and those obtained by ring-opening polycondensation of lactam.
Examples of the dicarboxylic acid include oxalic acid, adipic acid, suberic acid, sebacic acid, terephthalic acid, isophthalic acid, 1,4-cyclohexanedicarboxylic acid, malonic acid, succinic acid, glutaric acid, pimelic acid, azelaic acid, phthalic acid, etc. Among them, adipic acid and terephthalic acid are preferable.
Examples of the diamine include ethylenediamine, pentamethylenediamine, hexamethylenediamine, nonanediamine, decamethylenediamine, 1,4-cyclohexanediamine, p-phenylenediamine, m-phenylenediamine, m-xylenediamine and the like. Among them, hexamethylene. Diamine is preferred.
Examples of the lactam include ε-caprolactam, undecane lactam, lauryl lactam and the like, and among them, ε-caprolactam is preferable.

As the polyamide, polyamide (PA6), 6.6 nylon, and 6.10 nylon obtained by ring-opening and polycondensing ε-caprolactam from the viewpoint of affinity (adhesiveness) with carbon fibers and moldability of the resin molded body. , 1-12 nylon, MXD, HT-1m, 6-T nylon known as aromatic nylon, polyaminotriazole, polybenzimidazole, polyoxadiazol, polyamideimide, piperazine-based polyimide, among others, 6 6.6 Nylon is preferred.

The molecular weight of the specific resin is not particularly limited as long as it is easier to heat-melt than the polyolefin coexisting in the resin composition. For example, when the specific resin is polyamide, its weight average molecular weight is preferably in the range of 10,000 or more and 300,000 or less, and more preferably in the range of 10,000 or more and 100,000 or less.
Further, the glass transition temperature or the melting temperature (melting point) of the specific resin is not particularly limited as in the above molecular weight, and it may be easier to heat-melt than the polyolefin coexisting in the resin composition. For example, when the specific resin is polyamide, its melting point (Tm) is preferably in the range of 100 ° C. or higher and 400 ° C. or lower, and more preferably in the range of 150 ° C. or higher and 350 ° C. or lower.

The content of the specific resin is more than 20 parts by mass and 100 parts by mass or less with respect to 100 parts by mass of polyolefin, and is preferably 30 parts by mass or more and 90 parts by mass or less, preferably 40 parts by mass, from the viewpoint of improving the flexural modulus. It is more preferably 80 parts by mass or less.

The content of the specific resin with respect to the mass of the carbon fibers is preferably 0.1% by mass or more and 200% by mass or less, and preferably 10% by mass or more and 150% by mass or less, from the viewpoint of improving the flexural modulus. More preferably, it is 12% by mass or more and 120% by mass or less.
When the content of the specific resin with respect to the mass of the carbon fibers is 0.1% by mass or more, the affinity between the carbon fibers and the specific resin tends to increase, and when it is 200% by mass or less, the resin fluidity improves.

-Solution agent-
The compatibilizer is a resin that enhances the affinity between the polyolefin and the specific resin.
The compatibilizer may be determined according to the polyolefin.
The compatibilizer includes a site having the same structure as that of polyolefin or a structure compatible with the polyolefin, and having a part in the molecule having an affinity for the above-mentioned specific resin or a site reacting with a functional group of the specific resin. Is preferable.

Specifically, it is preferable to use modified polyolefin as the compatibilizer.
Here, if the polyolefin is polypropylene (PP), modified polypropylene (PP) is preferable as the modified polyolefin, and similarly, if the polyolefin is ethylene-vinyl acetate copolymer resin (EVA), the modified polyolefin is modified ethylene-acetic acid. Vinyl copolymer resin (EVA) is preferable.

Examples of the modified polyolefin include a polyolefin having a modified site containing a carboxy group, a carboxylic acid anhydride residue, a carboxylic acid ester residue, an imino group, an amino group, an epoxy group and the like introduced therein.
The modification site introduced into the polyolefin preferably contains a carboxylic acid anhydride residue from the viewpoint of further improving the affinity between the polyolefin and the specific resin and the upper limit temperature during molding, and is particularly anhydrous. It preferably contains a maleic anhydride residue.

The modified polyolefin can be obtained by reacting a compound containing the above-mentioned modified site with a polyolefin to directly chemically bond the modified polyolefin, or using a compound containing the above-mentioned modified site to form a graft chain and binding the graft chain to the polyolefin. There is.
Examples of the compound containing the above-mentioned modification site include maleic anhydride, fumaric anhydride, citric anhydride, N-phenylmaleimide, N-cyclohexylmaleimide, glycidyl (meth) acrylate, glycidyl vinylbenzoate, and N- [4- (2,2). 3-Epoxypropoxy) -3,5-dimethylbenzyl] acrylamide, alkyl (meth) acrylates, and derivatives thereof.
Among the above, modified polyolefin obtained by reacting maleic anhydride, which is an unsaturated carboxylic acid, with polyolefin is preferable.

Specific examples of the modified polyolefin include maleic anhydride-modified polypropylene, maleic anhydride-modified polyethylene, maleic anhydride-modified ethylene-vinyl acetate copolymer resin (EVA), and acid-modified polyolefins such as adducts or copolymers thereof. ..

As the modified polyolefin, a commercially available product may be used.
Examples of the modified propylene include Youmex (registered trademark) series (100TS, 110TS, 1001, 1010) manufactured by Sanyo Chemical Industries, Ltd.
Examples of the modified polyethylene include Youmex (registered trademark) series (2000) manufactured by Sanyo Chemical Industries, Ltd., Modic (registered trademark) series manufactured by Mitsubishi Chemical Industries, Ltd., and the like.
Examples of the modified ethylene-vinyl acetate copolymer resin (EVA) include the Modic (registered trademark) series of Mitsubishi Chemical Corporation.

The molecular weight of the compatibilizer is not particularly limited, but from the viewpoint of processability, the range is preferably 5,000 or more and 100,000 or less, and more preferably 5,000 or more and 80,000 or less.

The content of the compatibilizer is preferably 1 part by mass or more and 50 parts by mass or less, more preferably 2 parts by mass or more and 40 parts by mass or less, and 5 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polyolefin. The following is more preferable.
The content of the compatibilizer is preferably 1 part by mass or more and 100 parts by mass or less, more preferably 5 parts by mass or more and 70 parts by mass or less, and 10 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the specific resin. It is more preferably less than a part.
When the content of the compatibilizer is in the above range, the affinity between the polyolefin and the specific resin is enhanced, and the flexural modulus can be improved.

The content of the compatibilizer with respect to the mass of the carbon fiber is preferably 1% by mass or more and 100% by mass or less, more preferably 5% by mass or more and 70% by mass or less, and 10% by mass or more and 50% by mass or less. The following is more preferable.
When the content of the compatibilizer with respect to the mass of the carbon fiber is 1% by mass or more, the affinity between the carbon fiber and the specific resin can be easily obtained. If it is 100% by mass or less, the residual unreacted functional groups that cause discoloration and deterioration are suppressed.

-Other ingredients-
The resin composition according to the present embodiment may contain other components in addition to the above-mentioned components.
Other components include, for example, flame retardants, flame retardants, anti-drip agents when heated, plastic agents, antioxidants, mold release agents, lightfasteners, weatherproofing agents, colorants, pigments, etc. Modifiers, antistatic agents, antioxidants, fillers, reinforcements other than carbon fibers (talc, clay, mica, glass flakes, milled glass, glass beads, crystalline silica, alumina, silicon nitride, aluminum nitride, Well-known additives such as boron nitride, etc.) can be mentioned.
The other components are, for example, preferably 0 parts by mass or more and 10 parts by mass or less, and more preferably 0 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of polyolefin. Here, "0 parts by mass" means a form containing no other components.

(Manufacturing method of resin composition)
The resin composition according to the present embodiment is produced by melt-kneading each of the above components.
Here, as the means for melt-kneading, known means are used, and examples thereof include a twin-screw extruder, a Henschel mixer, a Banbury mixer, a single-screw screw extruder, a multi-screw screw extruder, and a conider.
The temperature (cylinder temperature) at the time of melt-kneading may be determined according to the melting point of the resin component constituting the resin composition and the like.

In particular, the resin composition according to the present embodiment is preferably obtained by a production method including a step of melt-kneading a polyolefin, carbon fibers, a specific resin, and a compatibilizer. When the polyolefin, the carbon fiber, the specific resin, and the compatibilizer are collectively melt-kneaded, a coating layer made of the specific resin is formed around the carbon fiber in a thin and nearly uniform state, and in the polyolefin. The domain of the specific resin is easily dispersed finely, and the flexural modulus is increased.

[Resin molded product]
The resin molded product according to the present embodiment contains a polyolefin, carbon fibers, a resin containing at least one of an amide bond and an imide bond (specific resin), and a compatibilizer. The content of the resin containing at least one of the amide bond and the imide bond is such that the content with respect to 100 parts by mass of the polyolefin is more than 20 parts by mass and 100 parts by mass or less. In addition, a part of the specific resin forms a domain having a diameter of 0.1 μm or more and 10 μm or less in polyolefin. That is, the resin molded product according to the present embodiment has the same composition as the resin composition according to the present embodiment.

The resin molded product according to the present embodiment may be obtained by preparing the resin composition according to the present embodiment and molding the resin composition, or may be a component other than carbon fibers. A composition containing the above may be prepared and obtained by mixing the composition with carbon fiber at the time of molding.
As the molding method, for example, injection molding, extrusion molding, blow molding, hot press molding, calender molding, coating molding, cast molding, dipping molding, vacuum molding, transfer molding and the like may be applied.

The method for molding the resin molded product according to the present embodiment is preferably injection molding because it has a high degree of freedom in shape.
The cylinder temperature for injection molding is, for example, 180 ° C. or higher and 300 ° C. or lower, preferably 200 ° C. or higher and 280 ° C. or lower. The mold temperature for injection molding is, for example, 30 ° C. or higher and 100 ° C. or lower, more preferably 30 ° C. or higher and 60 ° C. or lower.
Injection molding may be performed using commercially available devices such as NEX150 manufactured by Nissei Resin Industry Co., Ltd., NEX300 manufactured by Nissei Resin Industry Co., Ltd., and SE50D manufactured by Sumitomo Heavy Industries.

The resin molded product according to the present embodiment is suitably used for applications such as electronic / electrical equipment, office equipment, home appliances, automobile interior materials, and containers. More specifically, housings for electronic / electrical equipment and home appliances; various parts for electronic / electrical equipment and home appliances; interior parts for automobiles; storage cases for CD-ROMs and DVDs; tableware; beverage bottles; food trays Wrap material; film; sheet; etc.
In particular, since the resin molded product according to the present embodiment uses carbon fiber as the reinforcing fiber, it becomes a resin molded product having more excellent mechanical strength, and is therefore suitable for alternative use to metal parts.

The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[Examples 1 to 12, Comparative Examples 1 to 13]
The components according to Tables 1 and 2 (the numerical values in the table indicate the number of copies) are kneaded in a twin-screw kneader (manufactured by Toshiba Machine Co., Ltd., TEM58SS) under the following kneading conditions and melt kneading shown in Tables 1 and 2. Kneading was performed at a temperature (cylinder temperature) to obtain pellets of the resin composition. The obtained pellets were calcined at 600 ° C. for 2 hours, and the average fiber length of the remaining carbon fibers was measured by the above method. The measurement results are shown in Tables 1 and 2.

-Kneading conditions-
・ Screw diameter: φ58mm
・ Rotation speed: 300 rpm
・ Discharge nozzle diameter: 1 mm

The obtained pellets are subjected to an injection molding machine (manufactured by Nissei Resin Industry Co., Ltd., NEX150) at the injection molding temperature (cylinder temperature) and the mold temperature of 50 ° C. shown in Tables 1 and 2, and the ISO multipurpose dumbbell test piece (ISO527 tension). A D2 test piece (length 60 mm, width 60 mm, thickness 2 mm) was formed into a test (corresponding to the ISO178 bending test) (test portion thickness 4 mm, width 10 mm).

[Evaluation]
The following evaluations were performed using the obtained two types of test pieces. The evaluation results are shown in Tables 1 and 2.

-Tensile modulus, elongation-
The obtained ISO multipurpose dumbbell test piece was measured for tensile elastic modulus and elongation by a method conforming to ISO527 using an evaluation device (manufactured by Shimadzu Corporation, Autograph AG-IS 5kN, a precision universal testing machine).

-Bending modulus-
The flexural modulus of the obtained ISO multipurpose dumbbell test piece was measured by a method conforming to ISO178 using a universal test device (manufactured by Shimadzu Corporation, Autograph AG-Xplus).

-Weight Deflection Temperature (HDT)-
The obtained ISO multipurpose dumbbell test piece is subjected to a deflection temperature (° C.) under a load of 1.8 MPa by a method conforming to the ISO178 bending test using an HDT measuring device (HDT-3 manufactured by Toyo Seiki Co., Ltd.). Was measured.

-Dimensional change rate-
The obtained D2 test piece was left to stand for 24 hours under the conditions of 28 ° C. and 31% RH, and the dimensional change rate (%) of the test piece before and after leaving was measured in each of the TD direction and the MD direction of the test piece. ..
The dimensional change was measured by a microscopic length measuring device (manufactured by Olympus, STM6-LM).

-Presence or absence of coating layer-
Using the obtained D2 test piece, the presence or absence of a coating layer made of a specific resin was confirmed according to the method described above.

-Measurement of domain diameter of specific resin-
Using the obtained D2 test piece, the domain diameter of the specific resin in the thermoplastic resin was measured according to the method described above.

The details of the material types in Tables 1 and 2 are as follows.
-Thermoplastic resin-
-Polypropylene (Novatec (registered trademark) PP MA3, manufactured by Japan Polypropylene Corporation), SP value: 9.3
-Reinforcing fiber-
-Carbon fiber (with surface treatment, chopped carbon fiber Treca (registered trademark), manufactured by Toray Industries, Inc., average fiber length 20 mm, average diameter 7 μm)
-Specific resin-
-Polyamide PA6 (PA6, Zytel (registered trademark) 7331J, manufactured by DuPont), SP value: 13.6
-Polyamide PA66 (PA66, 101L, manufactured by DuPont), SP value: 11.6
-Polyamide PA1010 (PA1010, Hipprolon 200, manufactured by Arkema)
-Polyamide MXD6 (MXD6, manufactured by Mitsubishi Gas Chemical Company)
-Polyamide PA9T (nylon 9T, GENESTAR PA9T, made by Kuraray)
-Solution agent-
-Maleic anhydride-modified polypropylene (Umex (registered trademark) 110TS, manufactured by Sanyo Chemical Industries, Ltd.-Maleic anhydride-modified polyethylene (Modic M142, manufactured by Mitsubishi Chemical Corporation))
-Maleic anhydride-modified EVA: Maleic anhydride-modified ethylene-vinyl acetate copolymer resin (Modic A543, manufactured by Mitsubishi Chemical Corporation)

From the above results, it can be seen that in this example, a molded product having an excellent flexural modulus can be obtained even if the fiber length of the carbon fibers is shorter than in the comparative example.

When the molded product produced in each example was analyzed by the above-mentioned method, a layer of the compatibilizer used (maleic anhydride-modified polypropylene layer) was interposed between the coating layer and the polyolefin. (The layer of the compatibilizer is formed on the surface of the coating layer) was confirmed.

Claims (20)

With polyolefin
With carbon fiber
A resin containing at least one of an amide bond and an imide bond, wherein the content with respect to 100 parts by mass of the polyolefin is more than 20 parts by mass and 100 parts by mass or less.
With a compatibilizer,
Including
A part of the resin containing at least one of the amide bond and the imide bond forms a domain having a diameter of 0.1 μm or more and 10 μm or less in the polyolefin .
A non-crosslinked resin composition in which the content of the compatibilizer is 5 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polyolefin . The resin composition according to claim 1, wherein a part of the resin containing at least one of the amide bond and the imide bond forms a coating layer around the carbon fiber. The resin composition according to claim 2, wherein a layer of the compatibilizer is interposed between the coating layer and the polyolefin. The resin composition according to any one of claims 1 to 3, wherein the resin containing at least one of the amide bond and the imide bond is a polyamide. The resin composition according to any one of claims 1 to 4, wherein the compatibilizer is a modified polyolefin. The resin composition according to any one of claims 1 to 5, wherein the average fiber length of the carbon fibers is 0.1 mm or more and 2.5 mm or less. The resin composition according to any one of claims 1 to 6, wherein the content of the carbon fibers is 0.1 part by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the polyolefin. The invention according to any one of claims 1 to 7, wherein the content of the compatibilizer is 1 part by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the resin containing at least one of the amide bond and the imide bond. Resin composition. The invention according to any one of claims 1 to 8, wherein the content of the resin containing at least one of the amide bond and the imide bond with respect to the mass of the carbon fiber is 0.1% by mass or more and 200% by mass or less. Resin composition. The resin composition according to any one of claims 1 to 9, wherein the content of the compatibilizer with respect to the mass of the carbon fibers is 1% by mass or more and 100% by mass or less. With polyolefin
With carbon fiber
A resin containing at least one of an amide bond and an imide bond, wherein the content with respect to 100 parts by mass of the polyolefin is more than 20 parts by mass and 100 parts by mass or less.
With a compatibilizer,
Including
A part of the resin containing at least one of the amide bond and the imide bond forms a domain having a diameter of 0.1 μm or more and 10 μm or less in the polyolefin .
A non-crosslinked resin molded product in which the content of the compatibilizer is 5 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polyolefin . The resin molded product according to claim 11, wherein a part of the resin containing at least one of the amide bond and the imide bond forms a coating layer around the carbon fiber. The resin molded product according to claim 12, wherein a layer of the compatibilizer is interposed between the coating layer and the polyolefin. The resin molded product according to any one of claims 11 to 13, wherein the resin containing at least one of the amide bond and the imide bond is a polyamide. The resin molded product according to any one of claims 11 to 14, wherein the compatibilizer is a modified polyolefin. The resin molded product according to any one of claims 11 to 15, wherein the average fiber length of the carbon fibers is 0.1 mm or more and 2.5 mm or less. The resin molded product according to any one of claims 11 to 16, wherein the content of the carbon fibers is 0.1 part by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the polyolefin. The method according to any one of claims 11 to 17, wherein the content of the compatibilizer is 1 part by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the resin containing at least one of the amide bond and the imide bond. Resin molded body. The invention according to any one of claims 11 to 18, wherein the content of the resin containing at least one of the amide bond and the imide bond with respect to the mass of the carbon fiber is 0.1% by mass or more and 200% by mass or less. Resin molded body. The resin molded product according to any one of claims 11 to 19, wherein the content of the compatibilizer with respect to the mass of the carbon fibers is 1% by mass or more and 100% by mass or less.