JP2000334755A - Plastic molded article, method for producing the same, and method for producing fiber-reinforced plastic molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antifouling plastic molded article having a durable hydrophilic surface layer, a method for producing the same, and a method for producing a fiber-reinforced plastic molded article. SOLUTION: A plastic molded article having a surface carrying a hydrophilic inorganic oxide is provided. Further, after applying a hydrophilicity imparting agent or a hydrophilizing agent to a molding die, a method for producing a plastic molded body characterized by filling the molding die with a thermoplastic resin or a thermosetting resin composition and molding. . Also,
A method for producing a fiber-reinforced plastic molded article characterized by applying a hydrophilicity-imparting agent or a hydrophilizing agent to a mold, filling the mold with a sheet molding compound, and molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic molding having water-repellent antifouling properties, such as a bathtub, a bathtub apron, a washing pan, a bathroom wall, a bathroom ceiling, a wash counter, a kitchen counter, a method for producing the same, and a fiber reinforcement. The present invention relates to a method for manufacturing a plastic molded body.

[0002]

2. Description of the Related Art In a living environment, a thermosetting resin or an acrylic thermoplastic resin, which is called artificial marble, is often used for a plastic molding around water as described above. These plastic molded articles include proteins, fats and other organic substances emitted from the human body, bacteria that propagate as nutrients, microorganisms such as fungi, and inorganic substances such as metal ions contained in tap water and soap. There are soap scum and the like generated by chemical bonding, and these stains are complexed and adhere to the surface of the plastic molded body. Conventionally,
The removal of these contaminants from the plastic molded body requires a lot of time and is a serious task.

In order to impart an antifouling function to a plastic molded article, a method of reducing the free energy of the surface of the molded article to make the surface water-repellent, or a method of increasing the surface free energy to make the surface hydrophilic. Are listed. The surface of the molded article is made water-repellent by applying an antifouling coating agent such as a fluorine-based coating agent or a silicone-based coating agent having a relatively low surface free energy to the surface of the molded article, for example. In order to make the surface of the molded product hydrophilic, a photocatalytic substance such as titanium oxide is applied (in this case, an enamel substrate is used in particular) to form a hydrophilic coating layer. Done. For example, in JP-A-10-29246, a gel coat layer containing an organic silicon compound is formed on a plastic molded article to make the surface of the molded article water-repellent.
In Japanese Patent No. 25393, titanium oxide is applied to the surface of an enameled bathtub and baked to make the product surface hydrophilic.

[0004]

The above-mentioned plastic molded article is frequently used on a daily basis, and is required to exhibit its antifouling function continuously and to be durable. However, plastic molded articles coated with a fluorine-based coating agent or silicone-based coating agent as an antifouling material do not have a surface free energy low enough to prevent the adhesion of dirt, and sufficiently prevent the adhesion of contaminants. Can not. In addition, plastic molded articles coated with a photocatalytic substance such as titanium oxide have poor adhesion between the resin base material of the molded article and the coating agent, and the coating layer peels off during use. Have a point.

[0005] The present invention has been made in view of the above problems, and provides an antifouling plastic molded article having a durable hydrophilic surface layer, a method for producing the same, and a method for producing a fiber-reinforced plastic molded article. The purpose is to provide.

[0006]

The present invention relates to the following. (1) A plastic molded article having a surface carrying a hydrophilic inorganic oxide. (2) The plastic molded article according to the above (1), wherein the plastic molded article is made of fiber reinforced plastic. (3) The above (1) or (2), wherein the hydrophilic inorganic oxide is at least one selected from the group consisting of aluminum oxide, magnesium oxide, silicon oxide, cerium oxide and yttrium oxide. Plastic moldings. (4) A method for producing a plastic molded article, which comprises applying a hydrophilicity-imparting agent or a hydrophilicizing agent to a mold, filling the mold with a thermoplastic resin or a thermosetting resin composition, and molding. (5) A method for producing a fiber-reinforced plastic molded article, comprising applying a hydrophilicity-imparting agent or a hydrophilizing agent to a mold, filling the mold with a sheet molding compound, and molding. (6) The viscosity of the resin composition of the sheet molding compound containing no reinforcing material is 10,000 to 3
(5) wherein the pressure is 5,000 Pa · s.
The method for producing a fiber-reinforced plastic molded article according to the above. (7) Fill the sheet molding compound and add 1
The method for producing a fiber-reinforced plastic molded article according to the above (5) or (6), wherein the molding is performed at a pressure of ３3 MPa.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A method for transferring a layer having a hydrophilicity imparting agent formed on a molding die to a plastic molded article and supporting the hydrophilicity imparting agent on the surface of the plastic molded article is as follows. It has good adhesion to the substrate and is much more excellent than the post-coating method in which it is applied to a preformed plastic molded article. The coating composition used in the present invention comprises a hydrophilicity-imparting agent, a dispersion solvent for dispersing the hydrophilicity-imparting agent, and the like. The hydrophilicity-imparting agent has a hydroxyl group bonded to its surface, and the surface of the hydrophilicity-imparting agent becomes hydrophilic by a water molecule hydrogen-bonded to the hydroxyl group. When the composition containing the hydrophilicity-imparting agent, the dispersion solvent, and the like is applied to a mold, the formed layer exhibits hydrophilicity.

As the hydrophilicity-imparting agent, for example, there is a hydrophilic inorganic oxide. This hydrophilic inorganic oxide includes aluminum oxide, magnesium oxide, silicon oxide, indium oxide, zirconium oxide, vanadium oxide, niobium oxide, chromium oxide, molybdenum oxide, manganese oxide, nickel oxide, ruthenium oxide, copper oxide, and cadmium oxide. ,
Examples include cerium oxide, yttrium oxide, holmium oxide, neodymium oxide, iridium oxide, amorphous titanium oxide, and composite oxides of inorganic oxides such as aluminum silicate and magnesium silicate. These can be used in powder or granular form.

Preferably, at least one selected from the group consisting of aluminum oxide, magnesium oxide, silicon oxide, cerium oxide and yttrium oxide is used. They are,
They may be used alone or as a mixture of two or more.

The above-mentioned hydrophilic inorganic oxide in the present invention is used as a composition obtained by dispersing these in a dispersion solvent. Preferably, a binder is mixed with these compositions, and more preferably, a binder and a curing agent are mixed.

The binder includes unsaturated polyester resin, vinyl ester resin, epoxy resin, diallyl phthalate resin, acrylic resin, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, and fluorine resin. , Organic polymers such as silicone resin, alumina sol, silica sol,
An inorganic sol such as titania sol is used.

The dispersion solvent is not particularly limited as long as it can disperse the above-mentioned hydrophilic inorganic oxide or disperse or dissolve the binder. These dispersion solvents include benzene, toluene, xylene, styrene, methylene chloride, chloroform, carbon tetrachloride, chlorobenzene, dichloromethane, dichloroethylene, trichlene, perchloroethylene, ethyl ether, isopropyl ether, tetrahydrofuran, 1,4-dioxane, diglyme , Anisole, methanol, ethanol, propanol, 2-propanol, t-butanol, ethyl cellosolve, methyl cellosolve, butyl cellosolve, phenol, methyl ethyl ketone, methyl isobutyl ketone, 2-pentanone, 3-pentanone, ethyl acetate, butyl acetate, triethylamine, piperidine ,
Pyridine, acetonitrile, N, N-dimethylformamide, N, N-dimethylacetamide, dimethylsulfoxide, hexamethylphosphoramide, N-methylpyrrolidone, methyl methacrylate, dioctyl phthalate, water and the like are used.

The above-mentioned hydrophilic inorganic oxide and the binder, when converted to the weight%, are such that the hydrophilic inorganic oxide is 20 to 95%.
It is preferable that the content of the hydrophilic inorganic oxide is 50 to 95% by weight, and the content of the binder is 5 to 50% by weight. When the content of the hydrophilic inorganic oxide is less than 20% by weight, the hydrophilic inorganic oxide does not easily appear on the surface of the plastic molded article, and the surface energy tends not to be increased. As a result, the hydrophilicity of the surface decreases. There is a possibility that. On the other hand, when the content of the hydrophilic inorganic oxide exceeds 95% by weight, the amount of the binder becomes too small, and the strength of the surface layer of the plastic molded article may be reduced.

The hydrophilic inorganic oxide and the binder are dispersed in the dispersion solvent such that the total amount of the hydrophilic inorganic oxide and the binder becomes 5 to 70% by weight in terms of% by weight. The amount to be dispersed in the dispersion solvent is not necessarily limited to this range, for example, a roll coating method, a knife coating method, a die coating method, a spray-up method, a suitable method by a coating method such as brush painting method. The conditions are set. The order of mixing the hydrophilic inorganic oxide, the binder, and the dispersion solvent is not particularly limited.

A curing agent may be added to a composition comprising components such as a hydrophilic inorganic oxide, a binder, and a dispersion solvent. The curing agent may include tertiary (abbreviated as t) -butylperoxybenzoate, Benzoyl peroxide, t-
Organic peroxides such as butylperoxyisopropyl carbonate, t-hexylperoxyisopropyl carbonate, t-hexylperoxybenzoate, bis (4-t-butylcyclohexyl) peroxydicarbonate or t-hexylperoxydiethylhexanoate Aromatic, alicyclic, aliphatic etc. Is used.

Next, the hydrophilizing agent will be described. The term "hydrophilizing agent" as used herein means that the surface becomes wettable by external factors such as light and heat, and the contact angle with water is reduced to exhibit hydrophilicity. The hydrophilizing agent includes, for example, photocatalytic substances, and these substances include, for example, anatase-type titanium oxide, rutile-type titanium oxide, zinc oxide, tin oxide, bismuth trioxide, tungsten trioxide, ferric oxide, and titanium. And strontium acid.

These hydrophilizing agents can be used as a composition obtained by dispersing them in a dispersing solvent, like the hydrophilicity-imparting agent. Preferably, a binder is mixed with these compositions, and more preferably, a binder and a curing agent are mixed and used.

Next, a plastic molded article carrying a hydrophilic inorganic oxide will be described. As the resin of the plastic molded body, a thermoplastic resin or a thermosetting resin is used, and the surface of the plastic molded body, at least one surface of the back surface, the entire surface or a part of the above-described hydrophilic inorganic oxide is a base resin layer. It is carried on the upper side as a surface layer. In the surface layer to be formed, a hydrophilic inorganic oxide may be present in a dispersed state. The thickness of the surface layer is 0.5 to 300 μm, but is not necessarily limited to this range.

The thermoplastic resin of the plastic molded body includes:
Olefin resins such as polyethylene and polypropylene,
Styrene resins such as polystyrene and acrylonitrile butadiene styrene, acrylic resins such as polymethyl methacrylic resin, polyacetal, polyester resin, polyvinyl chloride resin and the like are used.

Further, the composition of the thermosetting resin of the plastic molded article includes a thermosetting resin, a filler, a coloring agent, a curing agent,
It comprises a component such as an ultraviolet absorber.

As the thermosetting resin, a thermosetting unsaturated polyester resin such as an unsaturated polyester resin or a vinyl ester resin is preferably used.
More than one kind can be mixed and used. Further, these thermosetting resins are used after being diluted with a polymerizable vinyl monomer. The polymerizable vinyl monomers include styrene, α-methylstyrene, t-butylstyrene, methyl (meth) acrylate, diallyl phthalate, divinylbenzene, vinyl toluene, vinyl acetate,
Methacrylic acid esters, triallyl cyanurate and the like are used.

As the filler, aluminum hydroxide, aluminum oxide, aluminum silicate, magnesium silicate, calcium carbonate, calcium silicate, silicon dioxide, calcium aluminate, zinc oxide, zinc oxide or the like which does not impair heat resistance or water resistance is used. Glass powder or the like is used. These fillers may be used as a mixture of two or more,
Further, it may be used after surface treatment with a silane coupling agent.

The curing agent includes tertiary (abbreviated as t) -butylperoxybenzoate, benzoyl peroxide, t-butylperoxyisopropyl carbonate, t-hexylperoxyisopropyl carbonate, t-hexylperoxybenzoate, Screw (4
Organic peroxides such as -t-butylcyclohexyl) peroxydicarbonate or t-hexylperoxydiethylhexanoate are used.

For the plastic molded article made of fiber reinforced plastic, the same thermosetting resin as that of the above-mentioned plastic molded article is used, and the thermosetting resin composition is further added with glass fiber, carbon fiber, aromatic polyamide fiber and the like. Or a mixture of whiskers and the like.

Next, a method for producing a plastic molded article will be described. After forming a layer by applying a hydrophilicity imparting agent or a hydrophilizing agent to a mold, the mold is filled with a thermoplastic resin or a thermosetting resin composition, and the layer is formed of a thermoplastic resin or a thermosetting resin. The composition is transferred to the surface to be cured and molded. As a molding method, injection molding, compression molding, reaction injection molding, injection molding and the like are used.

More specifically, a composition containing at least a hydrophilicity-imparting agent or a hydrophilicizing agent and a dispersion solvent is prepared, and this composition is roll-coated on a mold such as injection molding, compression molding, reaction injection molding, or injection molding. The layer is formed by applying a method such as a knife coating method, a die coating method, a spray-up method, or a brush-coloring method. Next, a thermoplastic resin or a thermosetting resin composition is filled in a molding die, and molded by heating and / or pressing.

At this time, the layer formed on the molding die is transferred to a surface where the thermoplastic resin or the thermosetting resin composition to be molded is cured. On the surface of the demolded thermoplastic resin or thermosetting resin plastic molded body, a hydrophilic inorganic oxide serving as a hydrophilicity-imparting agent, or a surface layer carrying a hydrophilicizing agent is firmly adhered and formed. . Therefore, the surface of the obtained plastic molded body can be formed as a hydrophilic surface layer because the layer applied to the mold surface is transferred, and is formed firmly. That is, it becomes the surface of the plastic molded article having antifouling properties.

Next, a method for producing a fiber-reinforced plastic molded body in the case of using a sheet molding compound (abbreviated as SMC) will be described.

SMC is obtained by adding a filler, a thickener, a low-shrinking agent, a polymerization inhibitor, a colorant, a curing agent, etc. to a thermosetting polymerizable unsaturated polyester resin such as an unsaturated polyester resin or a vinyl ester resin. An agent is mixed, and these are further impregnated with a reinforcing material and processed into a sheet shape. Not all of these additives need be added.

The thermosetting polymerizable unsaturated polyester resin is used after being diluted with a polymerizable vinyl monomer. For example, polymerizable vinyl monomers include styrene, chlorostyrene, tertiary (abbreviated as t) -butylstyrene, methyl acrylate, methyl methacrylate, diallyl phthalate, divinyl benzene, vinyl toluene or triallyl cyanurate. No.

As the filler among the additives, inorganic fillers such as calcium carbonate, magnesium silicate and aluminum hydroxide are used. The inorganic filler is blended in an amount of 100 to 180 parts by weight, preferably 120 to 150 parts by weight, based on 100 parts by weight of the combination of the thermosetting polymerizable unsaturated polyester resin and the low shrinkage agent described below. .

As the thickener, oxides or hydroxides of alkaline earth metals such as magnesium oxide, magnesium hydroxide, calcium oxide and calcium hydroxide are used. This thickener is used in an amount of 0.15 to 0.25 parts by weight, preferably 0.16 parts by weight, per 100 parts by weight of the combination of the thermosetting polymerizable unsaturated polyester resin and the low shrinkage agent described below.
０．２0.24 parts by weight.

As the low-shrinkage agent, thermoplastic resins such as polystyrene, styrene-vinyl acetate copolymer, polyethylene, polypropylene, polymethyl methacrylate, and styrene-butadiene copolymer are used. The low-shrinkage agent is blended in an amount of 5 to 40 parts by weight, preferably 10 to 30 parts by weight, based on 100 parts by weight of the thermosetting polymerizable unsaturated polyester resin.

As the polymerization inhibitor, parabenzoquinone, hydroquinone, nitrobenzene and the like are used, and as the colorant, pigments and dyes are used.

As the curing agent, tertiary (abbreviated as t) -butylperoxybenzoate, benzoyl peroxide, t-butylperoxyisopropyl carbonate, t-hexylperoxyisopropyl carbonate, t-hexylperoxybenzoate, bis- (4
Organic peroxides such as -t-butylcyclohexyl) peroxydicarbonate or t-hexylperoxydiethylhexanoate are used.

The curing agent is used in an amount of 0.5 to 2 parts by weight, preferably 0.8 to 1.2 parts by weight, based on 100 parts by weight of the combination of the thermosetting polymerizable unsaturated polyester resin and the low-shrinking agent. Parts are blended.

The SMC resin composition containing the above-mentioned thermosetting polymerizable unsaturated polyester resin and other components (hereinafter abbreviated as SMC compound) is impregnated with a reinforcing material and aged to form SMC. , Used as a molding material.

As the reinforcing material, glass fibers, carbon fibers, aromatic polyamide fibers or the like, or chopped strands or whiskers thereof are used. The reinforcing material is blended in an amount of 5 to 40% by weight, preferably 15 to 30% by weight based on the total weight of the SMC.

The SMC is used by impregnating a reinforcing material with a compound for SMC so as to reach a specific viscosity range after aging. In addition, the viscosity after aging refers to the viscosity of the compound for SMC aged in a state where the reinforcing material is not included, because the proper viscosity cannot be measured when the reinforcing material is present.

The viscosity of the compound for SMC was measured at 37-45 ° C.
After storage for up to 28 hours, it is measured using a Brookfield viscometer. The viscosity of the compound for SMC in the present invention uses the value measured by the above method.

The viscosity of the SMC compound is adjusted to 10,000 to 35,000 Pa · s. When this viscosity exceeds 35,000 Pa · s, SMC
The viscosity of the mold will be too high, and it will not flow sufficiently in the mold during molding, causing insufficient filling, or even if it flows, the flow resistance will be large, so peel off the layer formed on the mold surface. Or wrinkles may occur. In addition, this viscosity is 10,000 Pa · s
If it is less than 1, the viscosity of the SMC becomes too low,
There is a possibility that the handling property (handling property) may be deteriorated due to stickiness of the SMC itself.

The produced SMC is filled into a mold having a layer coated with a hydrophilicity-imparting agent or a hydrophilizing agent, and molded by pressurizing and heating. And molded. And the molding pressure is 1-3M
It is set to Pa and molded. If the molding pressure is less than 1 MPa, the flow of the SMC is not sufficiently performed, resulting in insufficient filling, or if the molding pressure exceeds 3 MPa,
Even if the SMC flows, the resistance during the flow will increase,
There is a possibility that the layer formed on the mold surface may be peeled off or wrinkles may be generated.

The temperature of the mold during molding is from 120 to 1
Heating is performed at 60 ° C., and the pressure-holding time is maintained at 1 to 10 minutes to perform pressure-heating molding. The mold temperature and the dwell time are not limited to the above ranges.

A plastic molded article using SMC is manufactured by the following method. A composition containing a hydrophilicity-imparting agent or a hydrophilizing agent, a dispersion solvent, and the like is applied to a mold or a mold that has been subjected to a mold release treatment to form a layer. Then, after filling the SMC adjusted to an appropriate viscosity and performing a predetermined pressurization and heating and releasing the mold after a lapse of a predetermined time, the layer applied to the molding die is integrally adhered to the SMC surface to be cured and the SMC is removed. Transferred to the surface. Thereby, in the obtained plastic molded body, a hydrophilicity-imparting agent or a hydrophilicizing agent is supported on the surface, and a hydrophilic surface layer is formed.

According to the above-mentioned manufacturing method, the layer formed on the molding die does not move in accordance with the flow of the SMC, so that there is no occurrence of slippage or wrinkling, whereby the surface of the obtained plastic molded product has a tactile feel. Excellent surface can be obtained.

On the other hand, after the plastic molded body has been molded in advance, a hydrophilicity imparting agent or a hydrophilicizing agent is added to the surface of the plastic molded body.
A method of post-coating a composition containing a binder, a dispersion solvent, and a curing agent may be used. Better.

According to the above-mentioned plastic molded article carrying a hydrophilic inorganic oxide or hydrophilic agent as a hydrophilicity-imparting agent in the present invention, a method for producing the same, and a method for producing a fiber-reinforced plastic molded article, Adhesion between the surface layer imparting hydrophilicity and the base resin is improved, and the durability of the surface layer can be improved. Then, contaminants do not adhere to this surface layer, and even if they do adhere, they can be easily washed off by running water, and a plastic molded article having excellent antifouling properties can be obtained.

The above-mentioned plastic molded article can be used, for example, by molding into water-blowing equipment and members such as a bathtub, a bathtub apron, a washing pan, a bathroom wall, a bathroom ceiling, a washing counter and a door, a kitchen counter and a door. it can.

The relationship between the hydrophilicity of the surface of the plastic molded article and the antifouling property will be described. When the contact angle of water is less than 20 °, contaminants are less likely to adhere to the surface of the plastic molded body, and when the contact angle is less than 10 °, it is more difficult for contaminants to adhere. In this case, it can be removed only by washing down with water. According to the present invention, such effects can be obtained.

[0050]

Examples (Examples 1 to 6) Examples of plastic molded articles will be described. After preparing a composition comprising a hydrophilic inorganic oxide or a hydrophilizing agent serving as a hydrophilicity-imparting agent, a binder, and a dispersing solvent, and applying this composition to a mold serving as a surface of a plastic molded body, a cavity of a male and female mating mold is prepared. A plastic molded article having a hydrophilic surface layer formed on its surface by injecting a thermosetting resin composition into the mixture, curing and releasing the mold, and having a length of 200
A flat plate having a width of 200 mm and a width of 200 mm was formed.

Example 1 (Preparation of Composition Containing Magnesium Oxide, Binder, and Dispersion Solvent) Magnesium oxide powder (NanoTek, MgO, manufactured by C-I Kasei Co., Ltd., trade name) was used for magnesium oxide, and vinyl was used for the binder. Ester resin (PS
-6150, manufactured by Hitachi Chemical Co., Ltd.), and butyl cellosolve was used as a dispersion solvent to prepare a composition containing a hydrophilic inorganic oxide. The mixing ratio of magnesium oxide and vinyl ester resin was 9 (magnesium oxide): 1 (vinyl ester resin) in weight ratio, and this compounding ratio was dispersed in butyl cellosolve so as to be 50% by weight to obtain a composition. .

(Application to Mold) The above-prepared composition was applied using a spray gun to a mold on the surface of a plastic molded product subjected to a mold release treatment, and was dried by heating at 100 ° C. for 10 minutes. The dispersion solvent was evaporated to form a hydrophilic layer.

(Preparation of Thermosetting Resin Composition and Molding of Plastic Molded Product) The thermosetting resin composition to be injected into the cavity of the mold contains 50% by weight of vinyl ester diluted with styrene as the thermosetting resin. Resin (PS615
0, manufactured by Hitachi Chemical Co., Ltd., trade name) 100 parts by weight,
200 parts by weight of aluminum hydroxide (HBT320, manufactured by Showa Denko KK, trade name) as a filler, bis (4-t-butylcyclohexyl) peroxydicarbonate (Percadox 16S, manufactured by Kayaku Akzo Co., Ltd.) as a curing agent, 0.3 parts by weight of trade name) and 1 part by weight of t-hexylperoxydiethylhexanoate (Percure HO, manufactured by NOF Corporation) were mixed and used uniformly.

The applied mold and the other mold are joined together, and the mold is clamped. The prepared thermosetting resin composition is poured into the cavity to be formed, and heated at a temperature of 100 ° C.
Molding was performed with a heating time set to 30 minutes. At this time, the layer was transferred to the plastic molded body side and demolded to obtain a plastic molded body constituting a surface layer carrying a hydrophilicity-imparting agent.

Example 2 (Preparation of Composition Containing Aluminum Oxide, Binder, and Dispersion Solvent) Powder of α-type aluminum oxide (AM21, manufactured by Sumitomo Chemical Co., Ltd., trade name) was used for aluminum oxide, and vinyl was used for the binder. Using an ester resin (PS-6150, manufactured by Hitachi Chemical Co., Ltd., trade name) and butyl cellosolve as a dispersion solvent, a composition containing a hydrophilic inorganic oxide was prepared. The mixing ratio of α-type aluminum oxide and vinyl ester resin is 9 (α-type aluminum oxide): 1 (vinyl ester resin) in weight ratio, and this compounding ratio is dispersed in butyl cellosolve so as to be 50% by weight. The composition was used.

(Application to Mold) The above-prepared composition was applied using a spray gun to a mold on the surface to be a surface of a plastic molded product subjected to a mold release treatment, and dried by heating at 100 ° C. for 10 minutes. The dispersion solvent was evaporated to form a hydrophilic layer.

(Preparation of Thermosetting Resin Composition and Molding of Plastic Molded Product) A 50% by weight vinyl ester diluted with styrene as a thermosetting resin was used as the thermosetting resin composition to be injected into the mold cavity. Resin (PS615
0, manufactured by Hitachi Chemical Co., Ltd., trade name) 100 parts by weight,
200 parts by weight of aluminum hydroxide (HBT320, manufactured by Showa Denko KK, trade name) as a filler, bis (4-t-butylcyclohexyl) peroxydicarbonate (Percadox 16S, manufactured by Kayaku Akzo Co., Ltd.) as a curing agent, 0.3 parts by weight of trade name) and 1 part by weight of t-hexylperoxydiethylhexanoate (Percure HO, manufactured by NOF Corporation) were mixed and used uniformly.

The applied mold and the other mold are joined together, and the mold is clamped. The prepared thermosetting resin composition is poured into the cavity to be formed, and the heating temperature is 100 ° C.
Molding was performed with a heating time set to 30 minutes. At this time, the layer was transferred to the plastic molded body side and demolded to obtain a plastic molded body constituting a surface layer carrying a hydrophilicity-imparting agent.

Example 3 (Preparation of Composition Containing Silicon Oxide, Binder, and Dispersion Solvent) Silicon oxide (SiO ₂ ) powder (Nan
oTek, SiO ₂ (trade name, manufactured by CI Kasei Co., Ltd.), and a vinyl ester resin (PS-615) as a binder.
0, manufactured by Hitachi Chemical Co., Ltd.), and butyl cellosolve was used as a dispersion solvent to prepare a resin composition containing a hydrophilic inorganic oxide. The mixing ratio of silicon oxide and vinyl ester resin was 9 (silicon oxide): 1 (vinyl ester resin) in weight ratio, and this mixing ratio was 50% by weight.
Was dispersed in butyl cellosolve to obtain a composition.

(Application to Mold) The above-prepared composition was applied using a spray gun to a mold on the surface to be a surface of a plastic molded article subjected to a mold release treatment, and dried by heating at 100 ° C. for 10 minutes. The dispersion solvent was evaporated to form a hydrophilic layer.

(Preparation of Thermosetting Resin Composition and Molding of Plastic Molded Product) The same thermosetting resin composition as that used in Example 1 was injected into the cavity of the mold. In addition, the same method as in Example 1 was applied to the method for producing a plastic molded body.

Example 4 (Preparation of Composition Containing Yttrium Oxide, Binder, and Dispersion Solvent) Yttrium oxide powder (NanoTek, Y ₂ O ₃ , trade name, manufactured by C I Kasei Co., Ltd.), binder Is a vinyl ester resin (PS
-6150, manufactured by Hitachi Chemical Co., Ltd.), and a resin composition containing a hydrophilic inorganic oxide was prepared using butyl cellosolve as a dispersion solvent. The compounding ratio of yttrium oxide and vinyl ester resin was 9 (yttrium oxide): 1 (vinyl ester resin) in weight ratio, and this compounding ratio was dispersed in butyl cellosolve so as to be 50% by weight to obtain a composition. .

(Application to Mold) The above-prepared composition was applied to a mold on the surface of a plastic molded product subjected to a release treatment using a spray gun, and was heated and dried at 100 ° C. for 10 minutes. The dispersion solvent was evaporated to form a hydrophilic layer.

(Preparation of Thermosetting Resin Composition and Molding of Plastic Molding) The same thermosetting resin composition as that used in Example 1 was injected into the mold cavity. In addition, the same method as in Example 1 was applied to the method for producing a plastic molded body.

(Example 5) (Preparation of composition comprising cerium oxide, binder and dispersion solvent) Cerium oxide powder (Nano
Tek, CeO, manufactured by CI Kasei Co., Ltd.)
A resin composition containing a hydrophilic inorganic oxide was prepared using a vinyl ester resin (PS-6150, manufactured by Hitachi Chemical Co., Ltd., trade name) as a binder and butyl cellosolve as a dispersion solvent. The compounding ratio of cerium oxide and vinyl ester resin was 9 (cerium oxide): 1 (vinyl ester resin) in weight ratio, and this compounding ratio was dispersed in butyl cellosolve so as to be 50% by weight to obtain a composition. .

(Application to Mold) The above-prepared composition was applied using a spray gun to a mold on the surface to be a surface of a plastic molded product subjected to a mold release treatment, and dried by heating at 100 ° C. for 10 minutes. The dispersion solvent was evaporated to form a hydrophilic layer.

(Preparation of Thermosetting Resin Composition and Molding of Plastic Molding) The same thermosetting resin composition as that used in Example 1 was injected into the cavity of the mold. In addition, the same method as in Example 1 was applied to the method for producing a plastic molded body.

Example 6 (Preparation of Composition Comprising Titanium Oxide of Hydrophilizing Agent, Binder, and Dispersion Solvent) Titanium oxide of the hydrophilizing agent was an anatase type titanium oxide powder (ST01, manufactured by Ishihara Sangyo Co., Ltd.). Product name) and vinyl binder resin (PS-61)
50, manufactured by Hitachi Chemical Co., Ltd.), and a resin composition containing a hydrophilizing agent was prepared using butyl cellosolve as a dispersion solvent. The composition ratio of titanium oxide anatase and vinyl ester resin was 9 (anatase titanium oxide): 1 (vinyl ester resin) in weight ratio, and the composition ratio was dispersed in butyl cellosolve so as to be 50% by weight. And

(Application to Mold) The above-prepared composition was applied using a spray gun to a mold on the surface of a plastic molded product subjected to a mold release treatment, and dried by heating at 100 ° C. for 10 minutes. The dispersion solvent was evaporated to form a hydrophilic layer.

(Preparation of Thermosetting Resin Composition and Molding of Plastic Molding) The same thermosetting resin composition as that used in Example 1 was injected into the mold cavity. In addition, the same method as in Example 1 was applied to the method for producing a plastic molded body.

(Comparative Example 1) As Comparative Example 1, the binder and the dispersion solvent of the other components were the same as in Example 1 except that the hydrophilicity-imparting agent or the hydrophilicizing agent was not contained in the composition applied to the mold. A composition was prepared and applied to a mold in the same manner as in Example 1. Further, a plastic molded body was molded using the same thermosetting resin composition as in Example 1.

(Test Example 1) In order to evaluate the hydrophilicity of the surface of the plastic molded body produced in Examples 1 to 6 and Comparative Example 1, water drops were dropped on the surface of the plastic molded body using a Pasteur pipette. The droplet diameter was measured with a caliper. In addition, a droplet is 0.03 mL. The larger the droplet diameter, the more hydrophilic the surface. Table 1 shows the measurement results.

Test Example 2 Water was applied to the entire surface of the plastic molded body to evaluate the water wettability of the surface of the plastic molded body produced in Examples 1 to 6 and Comparative Example 1. The spreading state of the water at this time was visually observed to evaluate the water wettability. The better the water wettability, the more hydrophilic the surface. Table 1 shows the results of the evaluation.

Test Example 3 In order to evaluate the hydrophilicity of the surface of the plastic molded body produced in Examples 1 to 6 and Comparative Example 1, the contact angle of the droplet of Test Example 1 was measured. A smaller contact angle indicates that the surface is more hydrophilic. The contact angle was measured using a contact angle meter (C
A-X150 type) was used. Table 1 shows the measurement results.

(Test Example 4) In order to evaluate the antifouling property of the surface of the plastic molded product produced in Examples 1 to 6 and Comparative Example 1, a salad oil in which carbon black was dispersed was used as a contaminant, and this was used as a plastic. It was forcibly attached to the surface of the molded body. Ten minutes after the adhesion, tap water was allowed to flow down to the soiled surface for 10 seconds, and the degree of stain removal was visually evaluated. Table 1 shows the results of the evaluation.

(Test Example 5) A surface layer in which a hydrophilic inorganic oxide or a hydrophilic agent serving as a hydrophilicity-imparting agent is carried on the surface of the plastic molded body produced in Examples 1 to 6 and Comparative Example 1, and a substrate resin The plastic molded body was immersed in hot water at 90 ° C. for 300 hours in order to evaluate the adhesion to the plastic molded body. This was taken out and visually inspected for swelling or peeling on the surface to evaluate. Table 1 shows the results of the evaluation.

[0077]

[Table 1]

As shown in Table 1, in the plastic molded articles of Examples 1 to 5, the droplet diameter was as large as 10 mm or more. It shows a wet state, and the contact angle of the droplets is 5 ° or less, indicating sufficient hydrophilicity. As for the antifouling property, the contaminants are easily washed away by flowing down with water and exhibit good characteristics, and also exhibit good characteristics without swelling or peeling in adhesion. Therefore, the antifouling property and durability of the surface layer of the plastic molded article are excellent. Further, the plastic molded product of Example 6 has the same effects as those of Examples 1 to 5 in the droplet diameter, water wettability, contact angle, and antifouling property. On the other hand, the plastic molded article of Comparative Example 1 is inferior in hydrophilicity and does not show an antifouling effect.

(Examples 7 to 13) Next, examples of the fiber-reinforced plastic molding will be described. As a plastic molded body having a hydrophilic stainproof property imparted to the surface molded from SMC, a plastic bath having a size of 0.7 m in length, 1.4 m in width and 0.55 m in height is pressurized and heated. Molded.

Example 7 (Preparation of Composition Containing Hydrophilic Inorganic Oxide, etc.) α-type aluminum oxide powder (AM2
1, using Sumitomo Chemical Co., Ltd., trade name) vinyl ester resin (PS-6150, manufactured by Hitachi Chemical Co., Ltd., trade name) as binder, butyl cellosolve as dispersion solvent, hydrophilic inorganic oxide, etc. A containing composition was prepared.
The mixing ratio of α-type aluminum oxide and vinyl ester resin is 9 (α-type aluminum oxide): 1 (vinyl ester resin) in weight ratio, and 50 wt%
Was dispersed in butyl cellosolve to obtain a composition.

(Application to Mold) The above-prepared composition was applied using a spray gun to the surface of a molding die to be a surface of a plastic molded product subjected to mold release treatment, and was heated and dried for 10 minutes at 145 ° C. The dispersion solvent was evaporated to form a hydrophilic layer.

(Preparation of Compound for SMC) As the thermosetting polymerizable unsaturated polyester resin, 80 parts by weight of an unsaturated polyester resin (PS9415, manufactured by Hitachi Chemical Co., Ltd., trade name) diluted with styrene was used as a low shrinkage agent. Is 20 parts by weight of a polystyrene solution (42% by weight) obtained by dissolving polystyrene (Dencastyrol QP-2-301, manufactured by Denki Kagaku Kogyo Co., Ltd.) with a styrene monomer, and t-butyl peroxybenzoate (curing agent) as a curing agent. PBZ, 1 part by weight, manufactured by NOF Corporation, 0.5 parts by weight of a parabenzoquinone solution (10% by weight) in which parabenzoquinone (manufactured by Seiko Chemical Co., Ltd.) is dissolved with a styrene monomer as a polymerization inhibitor, Calcium carbonate (NS-
400, manufactured by Nitto Powder Chemical Co., Ltd., 140 parts by weight, colorant (CR-30, manufactured by Dainichi Seika Kogyo Co., Ltd., 6.2 parts by weight), thickener: magnesium oxide (Kyowa Mag # 20, manufactured by Kyowa Chemical Industry Co., Ltd., trade name) 0.18 parts by weight was used.

(Preparation of SMC) The prepared SMC compound was impregnated into glass fiber as a reinforcing material. Chopped strands of glass fiber (glass roving 0740, manufactured by Nitto Boseki Co., Ltd.) were used as the reinforcing material. The amount of the chopped strand was 25% by weight based on the total weight of the SMC. Also, SMC
The viscosity of the compound for use was 15, as a value measured with a Brookfield viscometer after 24 hours in an environment of 40 ° C.
000 Pa · s. Then, similarly, set the SMC at 40 ° C.
For 24 hours.

(Molding of Plastic Bathtub) A molding die having a layer formed thereon was filled with the prepared SMC, and molding was performed at a molding pressure of 2.8 MPa and a dwell time of 6 minutes. The heating temperature of the molding die was 145 ° C. on the side where the layer was formed and 135 ° C. on the other side.

(Example 8) (Preparation of Composition Containing Hydrophilic Inorganic Oxide etc. and Application to Mold) A composition having the same amount of the same components as in Example 7 was prepared. In the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of a molding die to be a surface of a plastic bathtub.

(Preparation of SMC Compound and SMC
Preparation of the compound for SMC having the same components as in Example 7 was prepared by changing the amount of the thickener alone. 0.22 parts by weight of the thickening agent magnesium oxide was blended.
And SMC was produced with the same compounding quantity as Example 7.
The viscosity of the compound for SMC was adjusted to 33,000 Pa · s as a value measured by a Brookfield viscometer after 24 hours in an environment of 40 ° C. And SM
C was aged for 24 hours in a 40 ° C. environment.

(Molding of Plastic Bathtub) A plastic bathtub was formed in the same manner as in Example 7.

(Example 9) (Preparation of a composition containing a hydrophilic inorganic oxide and the like and application to a mold) A composition comprising the same components and the same amounts as in Example 7 was prepared, and this was used. In the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of a molding die to be a surface of a plastic bathtub.

(Preparation of SMC Compound and SMC
Preparation of SM having the same amount of the same components as in Example 7
A compound for C was prepared, and an SMC having the same blending amount as in Example 7 was prepared using this compound.

(Molding of Plastic Bathtub) A molding die having a layer formed thereon was filled with the prepared SMC, and molding was performed at a molding pressure of 1.3 MPa and a dwell time of 6 minutes. The heating temperature of the molding die was 145 ° C. on the side where the layer was formed and 135 ° C. on the other side.

Example 10 (Preparation of Composition Containing Hydrophilic Inorganic Oxide) Magnesium oxide powder (NanoTe) was used as the hydrophilic inorganic oxide.
k, MgO, manufactured by C-I Kasei Co., Ltd.), a vinyl ester resin (PS-6150, manufactured by Hitachi Chemical Co., Ltd., trade name) as a binder, butyl cellosolve as a dispersion solvent, and a hydrophilic inorganic oxide. Was prepared. The mixing ratio of magnesium oxide and vinyl ester resin was 9 (magnesium oxide): 1 (vinyl ester resin) in weight ratio, and this compounding ratio was dispersed in butyl cellosolve so as to be 50% by weight to obtain a composition. .

(Application to Mold) In the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of a molding die to be the surface of a plastic bathtub.

(Preparation of SMC Compound and SMC
Preparation of SM having the same amount of the same components as in Example 7
A compound for C was prepared, and an SMC having the same blending amount as in Example 7 was prepared using this compound.

(Formation of Plastic Bathtub) A plastic bathtub was formed in the same manner as in Example 7.

(Example 11) (Preparation of composition containing hydrophilic inorganic oxide) Powder of yttrium oxide (NanoTe) was used as the hydrophilic inorganic oxide.
k, Y ₂ O ₃ , manufactured by C-I Kasei Co., Ltd., a vinyl ester resin (PS-6150, manufactured by Hitachi Chemical Co., Ltd., trade name) as a binder, and butyl cellosolve as a dispersion solvent. A composition containing an oxide and the like was produced. The compounding ratio of yttrium oxide and vinyl ester resin was 9 (yttrium oxide): 1 (vinyl ester resin) in weight ratio, and this compounding ratio was dispersed in butyl cellosolve so as to be 50% by weight to obtain a composition. .

(Application to Mold) In the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of a molding die to be a plastic bathtub surface.

(Preparation of Compound for SMC and SMC
Preparation of SM having the same amount of the same components as in Example 7
A compound for C was prepared, and an SMC having the same blending amount as in Example 7 was prepared using this compound.

(Molding of Plastic Bathtub) A plastic bathtub was formed in the same manner as in Example 7.

(Example 12) (Preparation of composition containing hydrophilic inorganic oxide) Powder of cerium oxide (NanoTek, C
eO, manufactured by C-I Kasei Co., Ltd.), binder: vinyl ester resin (PS-6150, manufactured by Hitachi Chemical Co., Ltd., trade name), dispersion solvent: butyl cellosolve, hydrophilic inorganic oxide, etc. Was prepared. The mixing ratio of cerium oxide and vinyl ester resin is
The weight ratio was 9 (cerium oxide): 1 (vinyl ester resin), and this compounding ratio was dispersed in butyl cellosolve so as to be 50% by weight to obtain a composition.

(Application to Mold) In the same manner as in Example 7, a hydrophilic layer was formed on the surface of a molding die to be a plastic bathtub surface.

(Preparation of Compound for SMC and SMC
Preparation of SM having the same amount of the same components as in Example 7
A compound for C was prepared, and an SMC having the same blending amount as in Example 7 was prepared using this compound.

(Molding of Plastic Bathtub) A plastic bathtub was formed in the same manner as in Example 7.

(Example 13) (Preparation of composition containing hydrophilic inorganic oxide) Powder of silicon oxide (NanoTek, SiO
₂ , CI Chemical Co., Ltd., trade name; vinyl ester resin (PS-6150, Hitachi Chemical Co., Ltd., trade name) as binder, butyl cellosolve as dispersion solvent, containing hydrophilic inorganic oxide, etc. Was prepared. The mixing ratio of silicon oxide and vinyl ester resin is 9 (silicon oxide): 1 (vinyl ester resin) in weight ratio,
This composition was dispersed in butyl cellosolve so as to be 50% by weight to obtain a composition.

(Application to Mold) In the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of a molding die to be a plastic bathtub surface.

(Preparation of SMC Compound and SMC
Preparation of SM having the same amount of the same components as in Example 7
A compound for C was prepared, and an SMC having the same blending amount as in Example 7 was prepared using this compound.

(Molding of Plastic Bathtub) A plastic bathtub was formed in the same manner as in Example 7.

Comparative Example 2 A composition containing a hydrophilic inorganic oxide and the like was the same as in Example 7 (the hydrophilic inorganic oxide was α-type aluminum oxide). Further, in the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of the molding die which was to be the surface of the plastic bathtub.

The compound for SMC was the same as in Example 7, except that the amount of magnesium oxide as a thickener alone was changed to 0.27 parts by weight, and the amounts of other components were the same. In addition, SMC was produced in the same blending amount as in Example 7. At this time, the viscosity of the SMC compound was 4
After 24 hours in an environment of 0 ° C., the value was adjusted to 50,000 Pa · s as measured by a Brookfield viscometer.
The SMC was aged at 40 ° C. for 24 hours.

The plastic bath was filled with the above-mentioned SMC prepared in a molding die having a layer formed thereon, and molded at a molding pressure of 2.8 MPa for a holding pressure time of 6 minutes.
The heating temperature of the molding die is set at 14 on the side where the layer is formed.
The temperature was 5 ° C and the other was 135 ° C.

Comparative Example 3 A composition containing a hydrophilic inorganic oxide and the like was the same as in Example 7 (the hydrophilic inorganic oxide was α-type aluminum oxide). Further, in the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of the molding die which was to be the surface of the plastic bathtub.

The compound for SMC had the same components as in Example 7, except that the compounding amount of only magnesium oxide as a thickener was changed to 0.13 parts by weight, and the compounding amounts of other components were the same. In addition, SMC was produced in the same blending amount as in Example 7. At this time, the viscosity of the SMC compound was 4
After 24 hours in an environment of 0 ° C., the value was adjusted to 5,000 Pa · s as measured by a Brookfield viscometer. The SMC was aged at 40 ° C. for 24 hours.

The plastic bath was filled with the SMC prepared in a molding die having a layer formed thereon, and a molding pressure of 2.
The molding was carried out at a pressure holding time of 6 minutes at a setting of 8 MPa. The heating temperature of the molding die was set to 145 on the side where the layer was formed.
° C and 135 ° C for the other.

Comparative Example 4 A composition containing a hydrophilic inorganic oxide and the like was the same as that in Example 7 (the hydrophilic inorganic oxide was α-type aluminum oxide). Further, in the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of the molding die which was to be the surface of the plastic bathtub.

The SMC compound had the same components and the same amounts as in Example 8. In addition, SMC was produced in the same blending amount as in Example 7.

The plastic bath was filled with the above-mentioned SMC prepared in a molding die having a layer formed thereon, and the molding pressure was changed to 0.5 MPa, and the molding was carried out for a holding time of 6 minutes. The heating temperature of the molding die was 145 ° C. on the side where the layer was formed and 135 ° C. on the other side.

Comparative Example 5 A composition containing a hydrophilic inorganic oxide and the like was the same as that in Example 7 (the hydrophilic inorganic oxide was α-type aluminum oxide). Further, in the same manner as in Example 7, a layer having hydrophilicity was formed on the surface of the molding die which was to be the surface of the plastic bathtub.

The SMC compound had the same components and the same amounts as in Example 8. In addition, SMC was produced in the same blending amount as in Example 7.

A plastic bath was filled with the SMC prepared in a molding die having a layer formed thereon, and the molding pressure was set at 5%.
The molding was performed with a pressure holding time set for 6 minutes.
The heating temperature of the molding die is set at 14 on the side where the layer is formed.
The temperature was 5 ° C and the other was 135 ° C.

Comparative Example 6 A composition containing a hydrophilic inorganic oxide or the like was prepared in the same manner as in Example 8, except that the hydrophilic inorganic oxide was not blended, but with other components. SMC
The compound for use had the same components as in Example 8 and 0.22 parts by weight of magnesium oxide as a thickener. In addition, SMC was produced in the same blending amount as in Example 7.

The plastic bath was filled with the formed SMC in a molding die having a layer formed thereon, and the molding pressure was changed to 2.8 MPa. The heating temperature of the molding die was 145 ° C. on the side where the layer was formed and 135 ° C. on the other side.

(Test Example 6) Examples 7 to 13 and Comparative Example 2
The handling property or handling property of SMC in Nos. To 6 was evaluated from the viewpoints of stickiness and hardness when filling SMC into a molding die. Table 2 shows the results.

(Test Example 7) Examples 7 to 13 and Comparative Example 2
Water was applied to the entire surface of the plastic bathtub prepared in Nos. 6 to 6, and the state of spreading of water at this time was visually observed to evaluate water wettability, that is, hydrophilicity. The better the water wettability, the more hydrophilic. Table 2 shows the results.

(Test Example 8) The appearance of the plastic bathtub after molding was observed, and it was checked whether there was any underfill due to the unfilled SMC, whether the material was filled, whether the surface layer of the bathtub was peeled or wrinkled. The presence or absence was evaluated. Table 2 shows the results
Shown in In Table 2, ◎ indicates excellent, ○ indicates good, Δ indicates slightly inferior, and × indicates inferior.

[0124]

[Table 2]

As shown in Table 2, Examples 7 to 13 show good characteristics in any of the evaluations. On the other hand, in Comparative Example 2, the viscosity of the SMC was too high, the filling property of the material was not sufficient, and peeling and wrinkling of the bathtub surface layer occurred. In Comparative Example 3, the viscosity of the SMC was too low and it was sticky, and the handleability was poor. In Comparative Example 4, the molding pressure of the molding die was too small, and the filling property of the material was not sufficient. In Comparative Example 5, the molding pressure of the molding die was too large, and peeling and wrinkling of the bathtub surface layer occurred. In Comparative Example 6, no hydrophilic inorganic oxide was carried on the bathtub surface layer, and thus no hydrophilicity was observed on the surface layer.

[0126]

The plastic molded article according to the present invention has excellent hydrophilicity and a durable surface layer, and thus has excellent antifouling properties. Further, by using a fiber-reinforced plastic for the plastic molded body, the strength of the molded body can be improved. In addition, since the production method according to the present invention is a step of applying a hydrophilicity-imparting agent or a hydrophilizing agent to a mold, then filling the mold with a thermoplastic resin or a thermosetting resin composition and molding. A plastic molded article having a hydrophilic surface layer can be easily produced. In addition, since the production method according to the present invention is a process in which a hydrophilicity imparting agent or a hydrophilicizing agent is applied to a mold, and then the mold is filled with SMC and molded, the hydrophilic surface layer can be easily formed. It is possible to produce a fiber-reinforced plastic molded article having strength.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Eisuke Yuioka 1250, Shimoedori, Shimodate-shi, Ibaraki Pref.Hitachi Chemical Industry Co., Ltd. Inside the Yuki Plant of Kasei Kogyo Co., Ltd. (72) Inventor Keiro Ishikawa 7-1-1, Omikacho, Hitachi City, Ibaraki Prefecture Inside the Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Tomoji Oishi, Omikamachi, Hitachi City, Ibaraki Prefecture No. 1-1, Hitachi, Ltd., Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Daigoro Kamoto 7-1, 1-1, Omika-cho, Hitachi City, Ibaraki Prefecture F-term, Hitachi Research Laboratory, F-term 4F204 AA36 AB03 AB16 AB19 AB25 AC04 AD11 AD16 AG03 AR03 FA01 FB01 FB13 FF01 FF05 4J038 CB021 CB081 CC021 CD021 CD081 CD091 CF011 CF021 CG001 DB001 DD061 DD181 DL03 1 HA216 KA03 KA06 MA07 NA05 NA06 PB02 PC08

Claims (7)

[Claims] 1. A plastic molded article having a surface carrying a hydrophilic inorganic oxide. 2. The plastic molding according to claim 1, wherein the plastic molding is made of fiber reinforced plastic. 3. The method according to claim 1, wherein the hydrophilic inorganic oxide is aluminum oxide,
The plastic molded product according to claim 1 or 2, wherein the plastic molded product is at least one selected from the group consisting of magnesium oxide, silicon oxide, cerium oxide, and yttrium oxide. 4. A method for producing a plastic molded article, comprising applying a hydrophilicity-imparting agent or a hydrophilicizing agent to a mold, filling the mold with a thermoplastic resin or a thermosetting resin composition, and molding. Method. 5. A method for producing a fiber-reinforced plastic molded article, comprising applying a hydrophilicity-imparting agent or a hydrophilicizing agent to a mold, filling the mold with a sheet molding compound, and molding. 6. The resin composition of a sheet molding compound containing no reinforcing material has a viscosity of 10,000.
The method for producing a fiber-reinforced plastic molded product according to claim 5, wherein the pressure is 0 to 35,000 Pa · s. 7. The method for producing a fiber-reinforced plastic molded article according to claim 5, wherein the sheet molding compound is filled and molded at a pressure of 1 to 3 MPa.