JPS608018B2 - synthetic resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel mixed resin composition of polypropylene and styrene resin with improved physical properties, and more specifically, in producing the mixed resin composition, chlorinated polyolefin is used. This invention relates to a synthetic resin composition whose physical properties of molded articles are significantly improved by addition and mixing.

Polypropylene is an inexpensive resin and is widely used in various molded products and films.

However, when used as a molded product, the rigidity is low, the low-temperature impact strength is low, and the molding shrinkage rate is large.
In addition, it has many defects such as poor paintability, adhesion, dyeability, and poor plating properties. Therefore, inorganic fillers such as glass fiber, calcium carbonate, turquoise, and asbestos are added to improve the rigidity and molded wind ratio.
Although the addition of these inorganic fillers can achieve the purpose of improving rigidity and molding shrinkage, it has the disadvantage of causing problems such as deterioration of moldability and wear of the molding machine. On the other hand, although styrene/styrene resins do not have the disadvantages of polypropylene, they are expensive and their excellent features cannot be fully utilized over a wide range of areas. Therefore, it has been considered to improve the defects of polypropylene by mixing polypropylene and styrene resin, and on the other hand, to lower the price of styrene resin and expand the uses of each. However, while polypropylene is a crystalline polymer, styrenic resin is an amorphous polymer, and the two have considerably different chemical structures.

Therefore, even if they are simply mixed together by ordinary mechanical melt-kneading, the resulting molded product will suffer from peeling and peeling, resulting in very poor physical properties. As a result of intensive research into improving the physical properties of a mixture of polypropylene and styrene resin, which have poor compatibility and miscibility, the present inventors found that the addition of chlorinated polyolefin exerts a surprising effect. We have arrived at the present invention.

According to the present invention, for example, a mixture having a composition ratio (weight) of polypropylene and A mottled resin of 50/50 can have a tensile strength of only 150 kg', but can be increased to 250 to 340 kg by adding chlorinated polyethylene. It can be improved. The composition of the resin to be mixed consists of 85 parts by weight of polypropylene without 15 and 15 parts by weight of styrene resin without 85. If the mixed composition is outside this range, one component will be in a small amount and both will be mixed in the mixed resin composition. It is not possible to obtain a product that fully demonstrates the characteristics of.

In the present invention, the chlorinated polyolefin is added in an amount of 0.10 to 3 parts by weight, preferably 0.25 to 25 parts by weight, per 10 parts by weight of the above resin composition comprising polypropylene and styrene resin. be done. If the amount is less than this range, the effect of addition will not be seen, and if the amount is too large, the mechanical strength will be lowered. Examples of chlorinated polyolefins that can be used in the present invention include chlorinated polyethylene, chlorinated polypropylene, and chlorinated polybutene.
Particularly preferred are chlorinated polyethylene and chlorinated polypropylene. Polyethylene as chlorinated polyethylene,
A suitable material is one obtained by chlorinating an ethylene-propylene copolymer or an ethylene-butene copolymer using a conventional method as a raw material and having a chlorine content of 25 to 45% by weight. In addition, chlorinated polypropylene includes chlorinated isotactic polypropylene and atactic polypropylene, and products containing up to about 70% chlorine are manufactured, but chlorine content of up to 15% and 35% is produced.
% by weight is appropriate.

If the chlorine content is too small, the effect of addition will be small, and if it is too large, the thermal stability of the additive will be poor, which may cause decomposition during thickening and molding processes, which is not preferable. The polypropylene used in the present invention is not only a highly crystalline propylene homopolymer but also contains 90 mol% or more of propylene units, and this and Q of ethylene, butene-1, pentene-1, 3-methylbentene-1, and 4-methylbentene-1, etc. - Random or block copolymers made of one or more olefins, or resin compositions made by mixing two or more homopolymers and copolymers thereof.

Styrenic resins include styrene homopolymers, copolymers of styrene and styrene monomers such as Q-methylstyrene and chlorostyrene, and high-impact polystyrenes produced by craft polymerization of styrene monomers. Alternatively, a mixture thereof is obtained by polymerizing a styrenic monomer and a vinyl monomer such as an unsaturated nitrile or a Q8 monoolefinic unsaturated carboxylic acid ester, and furthermore, these vinyl monomers are polymerized with a styrene-based monomer and a vinyl monomer such as an unsaturated nitrile or a Q8 monoolefinic unsaturated carboxylic acid ester. These include acrylic combs containing saturated groups, chlorinated polyethylene, impact-resistant resins graft-polymerized with ethylene-vinyl acetate copolymers, or mixtures of these copolymers and impact-resistant resins. In addition to chlorinated polyolefins, if necessary, polymeric substances such as ethylene-vinyl acetate copolymers, butadiene-styrene block copolymers, ethylene-propylene elastomers, and stabilizers, such as c.

It is also possible to add heat-resistant stabilizers for polyolefin-containing polymers, heat-resistant stabilizers and antioxidants for polyolefins, heat-resistant stabilizers conventionally commonly used for styrene resins, other ultraviolet absorbers, beam pigments, and the like. In addition, stabilizers such as various heat stabilizers and ultraviolet absorbers, pigments such as extender pigments and coloring pigments, dyes, flame retardants such as halogen compounds, phosphorus compounds, or inorganic compounds, inorganic and Organic fillers, antistatic agents, nucleating agents, plasticizers, etc. can also be used in combination.

In order to obtain the resin mixture composition of the present invention, it is necessary to mix the above-mentioned components into a homogeneous mixture, and various methods can be used for kneading.

For example, the solution blending method involves dissolving and mixing in a solvent and pouring the solution into a non-solvent to make the mixed resin co-pillow, or rapidly drying the solvent after casting, rolls, kneaders, extruders, etc. There is a molten mud kneading method in which the composition is kept at a temperature at which it can be melted and processed and thoroughly mixed with bran. There is also a method of emulsifying or suspending, mixing and condensing.
In extreme cases, when performing in-line screw type injection molding, a method may be used in which a predetermined amount of each resin component is charged into a hopper and kneaded during molding. The mixed resin composition can be molded by a commonly used molding method, such as press molding or injection molding.

The mixed composition of the present invention has good moldability, low mold shrinkage, is rigid, and has excellent adhesion, paintability, dyeability, plating properties, etc., and is suitable for use in light electrical equipment parts, automobile parts, general equipment parts, etc. **Can be used for a very wide range of purposes such as miscellaneous goods, pipes, and building materials. Experimental examples are shown below to specifically explain the present invention, but these are not intended to limit the scope of the present invention.

Experimental Examples 1 to 8 The following resins were used as polypropylene, styrene resin, and chlorinated polyolefin.

Ashi resin (ABS) Manufactured by Daicel ■ Product name Sebian V
200 Polypropylene (PP) Manufactured by Sumitomo Chemical Co., Ltd. Product Name: Sumitomo Noblen 501 Chlorinated Polyethylene (CPE)
) Osaka Soda ■Product name Dysolac Hi 135 (chlorine content 35% by weight) As shown in Table 1 below, 5 parts by weight of polypropylene and ABS resin were used, and the amount of chlorinated polyethylene added to this was varied. The composition was prepared and charged into a Prabender Plastograph manufactured by Brabender Corporation equipped with a roller mixer type rotor set at 230° C. and a rotor rotation speed of 4 pm.

After the preparation, kneading was performed for 5 minutes. 1 of each kneaded product obtained
Press molded to rib thickness. Press molding was performed by preheating at 230° C. for 7 minutes and applying pressure for 3 minutes. Two parallel parts of the proboscis from the molding,
Punch out a middle-sized dumbbell and pull at a speed of 50 min.
A tensile test was conducted.

We also observed whether a phenomenon such as turning over a thousand pieces was observed in the fragments. The results are shown in Table-1. Table-1 Experimental example 9-1
1 The following three types of chlorinated polyethylene (CPE) with different degrees of chlorination were used at 10% by weight each based on the total amount of polypropylene and ABS resin.
It was carried out in exactly the same manner.

The results are shown in Table-2. CP day (30 grandchildren lost)
Osaka Soda Co., Ltd. Terisorasoku U303〃(35
〃 〃 〃 Day 135″ (40 grandchildren) 〃
〃 P304 Chlorine Content Table-2 Experimental Examples 12 to 20 As shown in Table-3 below, for each mixture in which the blending ratio of polypropylene and ABS resin was changed, the case where chlorinated polyethylene was not added and the case where mixture 10 was In the case where 5 parts by weight of chlorinated polyethylene was added to each part by weight, molded products were prepared in exactly the same manner as in Experimental Examples 1 to 8, and the tensile strength was tested.

The results are shown in Table-3. Table 3 Experimental Example 21 In Experimental Example 1, chlorinated polyp was used instead of chlorinated polyethylene.

The same procedure was carried out except that Hardren 14P (chlorine content: 26%) manufactured by Toyo Kasei Kogyo ■ was used as pyrene (CPP). As a result, the tensile strength is 350k9'c
Tiger, the elongation was 9%. No peeling was observed in the fragments. Experimental Example 22 The following resin composition AS resin Made by Daicel ■ Part by weight of product name Cevian N5 Polypropylene Made by Sumitomo Chemical ■ Sumitomo Norfren W
501 5 parts by weight Chlorinated polyethylene Dysolac U30 manufactured by Osaka Soda ■
35 parts by weight was kneaded, molded, and measured for physical properties in the same manner as in Example 1.

As a result, the tensile strength was 240 kg' and the elongation was 11%. No peeling was observed on the fracture surface. Experimental Example 23 The same procedure as Experimental Example 22 was conducted except that chlorinated polyethylene was not used.

As a result, the tensile strength is 150k9/ground and the elongation is 8.5%.
Met. Moreover, the fractured surface exhibited a state of being turned over. Experimental Example 24 Resin composition AAS resin as shown below, manufactured by Hitachi Chemical Co., Ltd./Guitax 610
0 5 parts by weight Polypropylene Manufactured by Sumitomo Chemical Co., Ltd. Sumitomo/Prene Day 501
5 Low weight parts Chlorinated polyethylene Dysolac U303 manufactured by Osaka Soda ■
5 parts by weight was kneaded, molded, and measured for physical properties in the same manner as in Experimental Example 1.

As a result, the tensile strength is 220k9/c fin, and the elongation is 10%.
Met. No peeling was observed on the fracture surface.
Experimental Example 25 The same procedure as Experimental Example 24 was carried out except that chlorinated polyethylene was not used.

Claims (1)

[Claims] 1. Resin composition 10 comprising 15 to 85 parts by weight of polypropylene and 85 to 15 parts by weight of styrene resin.
A synthetic resin composition prepared by adding and mixing 0.1 to 30 parts by weight of chlorinated polyolefin to 0 parts by weight. 2 The amount of chlorinated polyolefin is 0 per 100 parts by weight of the resin composition consisting of polypropylene and styrene resin.
．． 25 to 25 parts by weight of the synthetic resin composition according to claim 1. 3. The synthetic resin composition according to claim 1 or 2, wherein the chlorinated polyolefin is chlorinated polyethylene, chlorinated polypropylene, or chlorinated polybutene. 4. According to claim 3, the chlorinated polyethylene is a chlorinated polyethylene with a chlorine content of 25 to 45% by weight obtained by chlorinating polyethylene, an ethylene-propylene copolymer, or an ethylene-butene copolymer. The synthetic resin composition described. 5. The synthetic resin composition according to claim 3, wherein the chlorinated polypropylene is a chlorinated polypropylene with a chlorine content of 15 to 35% by weight obtained by chlorinating isotactic polypropylene or atactic polypropylene.