JPH10202766A - Resin molding and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molding which can be manufactured by a production method of high productivity, is improved sufficiently in falling ball impact strength, and is good in appearance, heat resistance, chemical resistance, weatherability, etc. SOLUTION: A molding is formed by containing a monofunctional monomer mainly of methacrylate, a crosslinking agent, polymethacrylate, an inorganic filler and obtained by molding and curing a resin composition in which the content of the curing agent is 0.5-12wt.% of the total resin composition while being pressurized and heated. A deflection temperature under load is 100-120 deg.C, and falling ball impact strength Y (J) at plate thickness of X (cm) is at least 2X<2> .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded product and a method for producing the same, and more particularly, to an acrylic resin molded product containing an inorganic filler suitably used as an artificial marble product and the like, and a method for producing the same. About. Acrylic artificial marble made of acrylic resin filled with inorganic filler is used for kitchen top plate, various counter tops, vanities, shower trays, floor materials, wall materials, partition boards, etc. It's being used.

[0002]

2. Description of the Related Art Acrylic artificial marble is disclosed in, for example,
It is manufactured by a casting method as proposed in Japanese Patent Publication No. 0-22586. Generally, in the casting method, a methacrylate ester is prepolymerized by about 10 to 30%, or a so-called syrup in which a methacrylate ester polymer is dissolved in a methacrylate ester is blended with an inorganic filler and mixed. A method of injecting the mixture into a gap in a mold, and then curing the mixture under normal pressure to obtain an artificial marble product. However, this casting method requires a long curing time and low productivity, and also has a large amount of monomer components, gives off a monomer odor, and is inconvenient to handle due to stickiness caused by syrup during injection. The problem is that it is difficult to maintain a good working environment, for example, it is easy to cause problems.

As one method for avoiding such a problem, for example, a press molding method as proposed in Japanese Patent Publication No. 5-13899 has been studied. In this method, a monomer containing 20% by weight or more of a polyfunctional (meth) acrylate, which is an essential component, a methacrylic acid-based resin powder, a curing agent, an inorganic filler, and the like are kneaded at room temperature or at a temperature lower than the curing temperature. The molding material obtained by aging is molded and cured by heating under pressure. However, according to this method, although a considerable improvement in productivity is achieved as compared with the conventional casting method or press molding method, mixing can be performed only at room temperature or at a temperature lower than the curing temperature because the curing agent is added and kneaded. In addition, there is a problem that the productivity is still low because the aging step is required, and the components cannot be sufficiently mixed in order to increase the productivity. In addition, there is a problem that the obtained molded product has a low falling ball impact strength.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a beautiful and heat-resistant material which can be manufactured by a method with high productivity and has a sufficiently improved falling ball impact strength. Another object of the present invention is to provide a resin molded product having good chemical resistance, weather resistance and the like.

[0005]

Means for Solving the Problems The present inventors have intensively studied an artificial marble molded product in order to solve the above problems, and as a result, in a method of molding and hardening under pressure and heat, a specific molding material is used. By molding and curing by a specific molding method, it is found that a resin molded article having a sufficient falling ball impact strength and having beautiful and good properties can be obtained.
The present invention has been completed.

That is, the gist of the present invention is as follows.
It contains a monofunctional monomer mainly composed of methacrylate, a crosslinking agent, a methacrylate polymer, an inorganic filler and a curing agent, and the content of the crosslinking agent is based on the total amount of the resin composition. A molded product obtained by molding and curing a resin composition of 0.5 to 12% by weight under pressure and heat,
When the deflection temperature under load is in the range of 100 to 120 ° C. and the falling ball impact strength Y (J) at the plate thickness X (cm) is Y =
2X ² or more at which the resin molded product, and a monofunctional monomer mainly composed of methacrylate ester, cross-linking agent, methacrylic acid ester polymer, and an inorganic filler are kneaded at a temperature of sixty-five to one hundred and twenty ° C. Clay A resin composition obtained by mixing a curing agent after cooling or during the cooling process into a molded product is molded and cured under pressure and heat in a mold. It is characterized by using a resin composition in which the mold temperature and / or the lower mold temperature is in the range of 120 to 140 ° C and the deflection temperature under load of the molded product is 0 to 20 ° C lower than the mold temperature. This is a method for producing a resin molded product.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The monofunctional monomer based on methacrylic acid ester used in the present invention is a monofunctional methacrylic acid ester alone, or another unsaturated monomer mainly based on methacrylic acid ester and copolymerizable therewith. A monomer mixture of
50% by weight or more, preferably 7% by weight of methacrylic acid ester
It is desirably 0% by weight or more.

[0008] Methacrylic acid esters include those having 5 carbon atoms.
About 18 to 18 methacrylates are preferably used, and specific examples thereof include methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, and lauryl methacrylate. These are used alone or in combination of two or more. Among them, methyl methacrylate is particularly preferably used.

The other unsaturated monomer copolymerizable with the methacrylic acid ester is not particularly limited.
For example, acrylates such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, and lauryl acrylate: aromatic vinyl compounds such as styrene and α-methylstyrene: acrylonitrile, methacrylonitrile And unsaturated monomers such as acrylamide, vinyl acetate, vinyl chloride, acrylic acid and methacrylic acid. One or more of these monomers may be used.

The crosslinking agent used in the present invention is not particularly limited, but a (meth) acrylic crosslinking agent which is usually an ester of a polyhydric aliphatic alcohol with methacrylic acid or acrylic acid is preferably used. Examples include methacrylate, 1,3-butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, and trimethylolpropane trimethacrylate. These crosslinking agents are used alone or in combination of two or more. The cross-linking agent is necessary to give the required deflection temperature under load to the resin molded article of the present invention, and is useful for imparting chemical resistance. The content of the crosslinking agent is 0.5 to 12%, preferably 2 to 10%, based on the total amount of the resin composition.
It is. If the content is less than 0.5%, the heat resistance of the molded product is insufficient, while if it exceeds 12%, the falling ball impact strength is undesirably reduced.

The methacrylic acid ester polymer used in the present invention can be used without particular limitation as long as it is a methacrylic acid ester polymer soluble in the above-mentioned monofunctional monomer mainly composed of methacrylic acid ester. However, for example, those obtained by polymerizing monomers mainly composed of the above methacrylic acid ester, or those obtained by polymerizing one or more of these monomers and other polymerizable monomers Are preferred.

As the methacrylate polymer, a polymer obtained by polymerizing the above-mentioned methacrylate-based monomer by an emulsion polymerization method, a suspension polymerization method, a bulk polymerization method or the like is usually used. The methacrylic acid ester-based polymer obtained by such a polymerization method is preferably in the form of particles from the viewpoint of mixing solubility with the monomer, and has a particle diameter of a size that can be used for kneading described below. Although it is not particularly limited as long as it is one, it is usually 5 mm or less, more preferably about 0.1 to 2 mm. The shape of the methacrylate polymer is usually in the form of beads, pellets, pulverized powder, or the like, and is preferably in the form of beads from the viewpoint of solubility, handleability, and the like. The average molecular weight of the methacrylate polymer is selected from those that can be dissolved in the monomer, and is generally in the range of 50,000 to 600,000, preferably 70 to 300,000, and more preferably 100 to 200,000. The blending ratio of the methacrylic acid ester polymer is determined by the total amount of the monofunctional monomer mainly composed of methacrylic acid ester and the crosslinking agent (hereinafter, referred to as a monomer mainly composed of methacrylic acid ester). A) 100 to 100 parts by weight, usually 50 to 4
00 parts by weight, preferably 80 to 300 parts by weight are used. Further, a part of the methacrylate polymer can be used in place of, for example, an acrylic partially crosslinked gel polymer whose production method is described in JP-A-60-202128.

The inorganic filler used in the present invention includes, for example, aluminum hydroxide, magnesium hydroxide, alumina, magnesium oxide, calcium carbonate, silica, mica, glass beads and the like. There is no particular limitation unless it impairs. Among these inorganic fillers, aluminum hydroxide, magnesium hydroxide,
Silica, especially aluminum hydroxide, is preferably used. The particle size of the inorganic filler is usually 0.1 to 1
00 μm, more preferably 1 to 30 μm
m. When the particle diameter exceeds 100 μm, the surface properties of the acrylic artificial marble product are inferior and the appearance may be impaired. Inorganic fillers that have been surface-treated, such as silane treatment, are also preferably used. The mixing ratio of the inorganic filler is usually 50 to 500 parts by weight, preferably 100 to 100 parts by weight, based on 100 parts by weight of the monomer mainly composed of methacrylic acid ester.
400 parts by weight.

The curing agent used in the present invention is not particularly limited, and benzoyl peroxide, lauroyl peroxide, cumene hydroperoxide, bis (4-t-butylcyclohexyl) dicarbonate, which is used in ordinary radical polymerization, Organic peroxides such as 1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane; azo such as azobisisobutyronitrile and 2,2-azobis (2,4-dimethylvaleronitrile) Compounds and the like are used. These curing agents are used alone or in combination of two or more. The mixing ratio of the curing agent is usually 1 to 10 parts by weight, preferably 3 to 7 parts by weight, based on 100 parts by weight of the monomer mainly composed of methacrylic acid ester.

The resin molded product of the present invention is a resin composition obtained by kneading and mixing a monofunctional monomer mainly composed of methacrylate, a crosslinking agent, a methacrylate polymer, an inorganic filler and a curing agent. Is molded and cured under pressure and heat. The resin composition is, for example, a monofunctional monomer mainly composed of methacrylic acid ester, a cross-linking agent, a methacrylic acid ester-based polymer, and an inorganic filler in a kneading machine of 65 to 120.
Mixing and kneading under a temperature condition of ° C. to obtain a clay-like kneaded material, which can be preferably carried out by mixing a curing agent after cooling or during the cooling process.

The kneader includes a batch type twin-screw kneader,
A continuous twin-screw kneader is preferably used. As a batch type twin-screw kneader, for example, Z placed parallel in a trough
A twin-arm kneader in which two mixing blades, such as a mold, an H-type, a finisher-type, and a dispersion-type, rotate in opposite directions to shear, compress, stretch and knead the mixture; Pressure kneader that has a typical pressure cover, and compresses the pressure cover by air pressure, liquid pressure, etc., thereby generating a strong shear force between the kneaded material and the trough wall surface or between the kneaded materials to enhance the kneading; An internal mixer or the like in which the raw materials are put into the mixing chamber, and the two rotors incorporated in the mixing chamber rotate in opposite directions to give a strong shearing force between the chamber wall and the rotor or between the rotors and knead the mixture. Can be As a continuous twin-screw kneader, raw materials are continuously fed into a kneading section by a feed screw section arranged in a raw material supply section, kneaded in a kneading section in which a rotor or a kneading desk or the like is arranged, and the kneaded material is continuously mixed. And a twin-screw kneader, a container kneader or the like is preferably employed. The kneading temperature is preferably from 65 to 120 ° C, more preferably from 70 to 100 ° C. By kneading in this temperature range, the kneading is completed in a short time of 10 minutes or less, and the production of a molded article having a high falling ball impact strength can be achieved.

The method of mixing the curing agent with the kneaded material obtained by kneading is not particularly limited, and for example, various mixers and kneaders can be used. Among these, it is preferable to use the twin-screw kneader, and for example, the one used for the kneading can be used again, or two twin-screw kneaders can be used. The mixing time is 1 to 5
Mixing is completed in about a minute.

The resin molded article of the present invention has, for example, an upper mold temperature and / or a lower mold temperature in the range of 120 to 140 ° C., preferably 120 to 135 ° C., and the deflection temperature under load of the molded article is lower than the mold temperature. 0-20 ° C, preferably 0-15 ° C
It can be produced by a method in which the resin composition having a low temperature is molded and cured by heating under pressure in a mold. In this method, when both upper and lower mold temperatures are lower than 120 ° C., the curing time tends to be long and the falling ball impact strength tends to decrease. On the other hand, when the mold temperature exceeds 140 ° C., the molded article tends to have a whitening defect, foaming, or a poor releasability, which is not preferable.

When the deflection temperature under load of a molded product obtained by molding and curing a resin composition as a molding material is higher than the mold temperature, distortion tends to occur. It is not preferable because stress concentrates on the boundary between the wall and the standing wall and the like, cracks are generated, and the falling ball impact resistance is reduced. On the other hand, the deflection temperature under load of a molded product obtained by molding and curing the resin composition is 20 degrees below the mold temperature.
If the temperature is lower than ℃, not only the releasability will be remarkably deteriorated, but also the surface properties of the molded product will be deteriorated, and warpage will occur at the time of demolding. That is, by setting the deflection temperature under load of the molded product obtained by molding and curing the resin composition to a temperature lower by 0 to 20 ° C. than the mold temperature, there is no mold release defect, and the surface properties are good. Thus, it is possible to obtain a molded product having no crack at the boundary between the standing wall portion and the like and excellent in falling ball impact resistance. In the above manufacturing method, if one of the upper mold temperature and the lower mold temperature is in the range of 120 to 140 ° C., the other temperature is 1
It may be lower than 20 ° C, 100 ° C or higher, preferably 11 ° C.
Temperatures above 0 ° C. can be used.

The molded article of the present invention needs to have a deflection temperature under load of 100 to 120 ° C. measured by ASTM D648. If the deflection temperature under load is less than 100 ° C., it is not possible to produce a molded product having good surface properties in good yield due to the problem of releasability, and in applications as artificial marble, heat resistance is insufficient, so it is preferable. Absent. on the other hand,
When the temperature exceeds 120 ° C., heat resistance is improved, but cracks and the like are liable to occur, and the falling ball impact resistance is undesirably reduced.

Further, the resin molded article of the present invention is a resin molded article according to JIS K
7211 by falling ball impact strength Y (J) is Y = 2X ² or [where, X represents a plate thickness of the flat plate (cm)] satisfied, that is excellent in impact resistance at practical is characterized. In the resin molded product of the present invention, if necessary, a glass fiber, an aramid fiber, a fiber reinforcing material such as carbon fiber, a coupling agent, a pattern material made of a polymer containing an inorganic filler, a pattern made of dyed fiber Additives such as materials, dyes, pigments, light stabilizers, antioxidants, release agents, polymerization regulators, polymerization inhibitors, and low shrinkage agents can be included. These can be easily mixed when producing the resin composition.

[0022]

The present invention will be described in more detail with reference to the following Examples, which by no means limit the scope of the present invention. The falling ball impact strength, the deflection temperature under load, and the polymer content of the partially crosslinked polymer described in the examples were measured and evaluated by the following methods.

Falling ball impact strength : A 50% breaking energy was determined by the method of JIS K7211, and this was defined as the falling ball impact strength. The falling ball impact tester used is in accordance with JIS K6718, and the steel ball is JIS ball type 2 (1 ± 0.05).
kg, diameter about 63 mm). The test piece is one side, 1
A square of 50 ± 1 mm was used.

Deflection temperature under load : HD, manufactured by Toyo Seiki Co., Ltd.
ASTM D using a T tester S6-MH type measuring instrument
648.

Polymer content of partially crosslinked polymer : 10 parts of hydroquinone monomethyl ether was added to a Soxhlet extractor.
150 ppm of dichloromethane dissolved by adding 00 ppm was added, and 15 g of the partially crosslinked polymer was placed in a cylindrical filter paper for extraction.
It was pulverized to a particle size of not more than mm. The extractor flask was heated at a constant temperature of 50 ° C. and refluxed for 20 hours to perform extraction. The extract was put into 1200 ml of methanol and reprecipitated to precipitate a polymer. The precipitated polymer was separated by filtration through filter paper, and was dried at 55 ° C. under reduced pressure at 55 ° C. until there was no loss in weight with the polymer remaining in the cylindrical filter paper.
The weight of the polymer was determined and divided by the weight of the partially crosslinked polymer to determine the polymer content.

Example 1 Continuous biaxial kneading of a liquid obtained by mixing 57 parts by weight of methyl methacrylate and 43 parts by weight of neopentyl glycol dimethacrylate in a liquid mixing tank at a feed rate of 10 kg / hour from the liquid mixing tank by means of a metering pump. Machine [Kurimoto Iron Works Ltd .: S2 type KRC kneader, caliber 50φ, L / D = 1
3, rotation speed 100 rpm, power 3.7 kW],
In a powder mixing tank, methacrylic resin beads (98% by weight of methyl methacrylate) were added to 274 parts by weight of aluminum hydroxide.
And a copolymer of 2% by weight of methyl acrylate, 105 weight parts of a weight average molecular weight of 110,000 and an average particle diameter of 0.3 mm) were mixed with a powder quantitative feeder at 37.9 kg.
/ H feed rate. These materials were heated to a heat medium temperature of 90 using a jacket attached to a continuous twin-screw kneader.
While heating at ℃, the dissolution of the methacrylic resin beads in the above mixed solution and the mixing and dispersion of aluminum hydroxide in the dissolved mixture were carried out at the same time to obtain a clay-like material having an outlet temperature of 82 ° C. After cooling this to 40 ° C., it is supplied to an extruder [PCM30, manufactured by Ikegai Seisakusho Co., Ltd.], and from the curing agent tank, 1,1-di-t-butylperoxy-
3,3,5-trimethylcyclohexane was mixed with liquid mixture 1
By supplying 3.5 parts by weight per 00 parts by weight, a sheet-shaped resin composition was obtained. The average residence time required for dissolving and kneading the raw materials in the continuous twin-screw kneader and the mixing time of the curing agent in the extruder were both 2 minutes. 10 kg of the obtained resin composition was placed on a top plate part 600 mm × 1000 mm, 50
The mold was put into a vanity mold having a height of 1 mm and a back guard, and the mold temperature was set to 125 ° C. for the upper mold and 125 ° C. for the lower mold, and pressed at 100 kgf / cm ² for 10 minutes. After curing, 600mm x 1000mm x 1
A marble vanity of 0 mm was obtained. The releasability was good, and the obtained molded article was glossy and had no cracks. A sample of 150 mm × 150 mm square was cut out from the vanity stand, and the falling ball impact strength was measured.
J and high falling ball impact strength. The deflection temperature under load is 11
At 1 ° C., it was 14 ° C. lower than the mold temperature.

Example 2 2.5 kg of a mixture of 57 parts by weight of methyl methacrylate and 43 parts by weight of neopentyl glycol dimethacrylate
To a pressure kneader [Moriyama Seisakusho: D10-20
Mold, mixing capacity 10 liters], and a mixture of 105 parts by weight of methacrylic resin beads and 47 parts by weight of a stone-like pattern material as in Example 1 in 274 parts by weight of aluminum hydroxide in a powder mixing tank. 65 kg were fed. These materials were kneaded for 20 minutes while heating at a heating medium temperature of 90 ° C. using a jacket attached to a pressure kneader, and then cooled to 50 ° C., followed by 1,1-di-t-butylperoxy-3. 87 g of 3,3,5-trimethylcyclohexane was supplied and mixed for 5 minutes to obtain a resin composition. 10 kg of the obtained resin composition is weighed 600 mm × 1000 mm
It is poured into a vanity mold having a 0 mm height hang and a back guard, and the mold temperature is set to 135 ° C.
The lower mold was set at 120 ° C., pressurized at 100 kgf / cm ² for 10 minutes, molded and cured, and 600 mm × 1000 mm ×
A 10 mm marble-like vanity was obtained. The releasability was good, and the obtained molded article was glossy and had no cracks. A 150 mm × 150 mm square sample was cut out from the vanity stand, and the falling ball impact strength was measured.
J and high falling ball impact strength. The deflection temperature under load is 11
At 6 ° C., it was 19 ° C. lower than the upper mold temperature and 4 ° C. lower than the lower mold temperature.

Example 3 45 parts by weight of methyl methacrylate, 15 parts by weight of neopentyl glycol dimethacrylate, 40 parts by weight of the same methacrylic resin beads as in Example 1, and 2,2'-azobis (4-methoxy-2,4- Dimethyl valeronitrile)
0.003 parts by weight were mixed and dissolved, poured into a cell assembled with two glass plates and a gasket at 10 mm intervals, and polymerized at 60 ° C. for 2 hours to obtain a partially crosslinked gel polymer. The polymer content of the partially crosslinked polymer was 50% by weight. 2.5 kg of this partially crosslinked polymer, 1.75 kg of methyl methacrylate, 0.75 kg of neopentyl glycol dimethacrylate, 2.5 parts by weight of methacrylic resin beads as in Example 1, 7.5 kg of aluminum hydroxide, and a stone-like pattern 1.5 kg of the material was put into a pressure kneader in the same manner as in Example 2, kneaded for 20 minutes, and then cooled to 50 ° C., followed by 1,1-di-t-butylperoxy-3,3,5- 87 g of trimethylcyclohexane
The mixture was supplied and mixed for 5 minutes to obtain a resin composition. 10 kg of the obtained resin composition is top plate part 600 mm × 1000 mm,
The mold is put into a vanity mold having a 50 mm height sagging and back guard, and the mold temperature is set to the upper mold 125.
C., lower mold 115 ° C., pressurization at 100 kgf / cm ² for 10 minutes, molding and curing, 600 mm × 1000 m
An acrylic artificial marble vanity of mx 10 mm was obtained. The releasability is good, and the obtained molded product is glossy,
There were no cracks. 150 mm x 15 from the washstand
When a 0 mm square sample was cut out and the falling ball impact strength was measured, the falling ball impact strength was as high as 2.5 J. The deflection temperature under load was 112 ° C., which was 12 ° C. lower than the upper mold temperature and 3 ° C. lower than the lower mold temperature.

Comparative Example 1 A liquid mixture of 40 parts by weight of methyl methacrylate and 60 parts by weight of neopentyl glycol dimethacrylate, and 100 parts by weight of methacrylic resin beads as in Example 1 and 260 parts by weight of aluminum hydroxide, A powder mixture obtained by mixing 47 parts by weight of a pattern material was used as a raw material.
The mixture was kneaded in the same manner as in Example 1 to obtain a clay-like substance having an outlet temperature of 79 ° C. 1,1-di-t-butylperoxy-3,3,5-
Trimethylcyclohexane was mixed in the same manner as in Example 1 to obtain a sheet-shaped resin composition. This resin composition 10
Using the same mold as in Example 1, the upper mold temperature was 125 kg.
C., lower mold temperature 115 ° C., pressurization at a pressure of 100 kgf / cm ² for 10 minutes, molding and curing, 600 mm ×
A 1000 mm × 10 mm marble vanity was obtained. The releasability was good and the obtained molded product was glossy, but cracks occurred at the boundary between the top plate and the standing wall.
A 150 mm × 150 mm square sample was cut out from the washstand and the falling ball impact strength was measured to be 1.6 J. The deflection temperature under load was 130 ° C., which was 5 ° C. higher than the upper mold temperature and 15 ° C. higher than the lower mold temperature.

[0030]

The resin molded article of the present invention can be produced by a production method having high productivity and has a sufficiently improved falling ball impact strength, good beauty, heat resistance, chemical resistance, weather resistance, etc. It is suitable as an acrylic artificial marble. Further, the method for producing a molded article of the present invention provides an economical production method with high productivity.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuhiko 2-28 Kurashiki-cho, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture Inside Kuraray Co., Ltd.

Claims (2)

[Claims] 1. A resin composition comprising a monofunctional monomer mainly composed of methacrylic acid ester, a crosslinking agent, a methacrylic acid ester-based polymer, an inorganic filler and a curing agent. A molded article obtained by molding and curing a resin composition in an amount of 0.5 to 12% by weight based on the total amount of the article under pressure and heat, wherein the deflection temperature under load is in the range of 100 to 120 ° C, and a resin molded article, wherein the falling ball impact strength Y in the sheet thickness X (cm) (J) is Y = 2X ² or more. 2. After kneading a monofunctional monomer mainly composed of methacrylic acid ester, a cross-linking agent, a methacrylic acid ester-based polymer, and an inorganic filler at a temperature of 65 to 120 ° C. to form a clay-like material. In a method for producing a molded product in which a resin composition obtained by mixing a curing agent after cooling or during the cooling process with a curing agent under pressure and heat in a mold, the upper mold temperature and / or Or lower the mold temperature to 120-1
A method for producing a resin molded product, comprising using a resin composition having a temperature within a range of 40 ° C and a deflection temperature under load of the molded product being 0 to 20 ° C lower than the mold temperature.