JP5974491B2 - Manufacturing method of fiber reinforced resin molded product - Google Patents

Description

The present invention relates to a process for producing a fiber-reinforced resin molded article.

  Fiber-reinforced resin molded products (hereinafter referred to as FRP) are lightweight, high-strength, and highly rigid, so they are used in the fields of sports and leisure products such as fishing rods and golf shafts, and are used in industries such as automobiles and aircraft. It is used in a wide range of fields up to the field of industrial parts.

  In manufacturing FRP, a method of using an intermediate material called a prepreg obtained by impregnating a fiber reinforcing material made of reinforcing fibers with a resin is generally widely used. After cutting the prepreg into a desired shape, it is shaped to create a preform, and this preform is heated and cured in a mold to obtain FRP.

  High cycle press molding performed using high temperature and pressure is expected in automotive applications because of its high productivity. For example, International Publication No. 2004/48435 (Patent Document 1) proposes a method of forming a prepreg with a press.

  However, the resin does not spread over a part of the fiber reinforcing material on the surface of the FRP press-molded using the molding method described in Patent Document 1 using a preform formed by stacking prepregs. The occurrence of “withering” occurs frequently, leaving a major problem on the surface appearance.

  The automotive outer panel obtained using the molding method described in Patent Document 1 is required to have a very high grade called class A as a surface smoothness state after coating, When resin withering occurs on the surface of the FRP, class A quality cannot be obtained after painting.

  The cause of the resin withering is considered to be due to (1) minute unevenness on the mold surface and (2) local dimensional error of the mold when the preform is heated and cured in the mold. . When a situation that causes these problems exists, if the preform is placed in a mold and is to be cured by heating, a gap is generated at a location where the preform is not in contact with the mold.

  Since the pressure is not applied to the preform in this gap, the resin withering occurs at that location on the surface of the FRP. As a method for improving the resin withering due to the above-mentioned cause (1), there is a method in which the processing accuracy of the mold is increased to reduce the surface roughness, and the number of projections and depressions on the molding surface of the mold are caused to occur. . There is also a method of eliminating the local dimensional error of the mold by increasing the molding pressure. Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 2009-226657 (Patent Document 2), a method is also known in which an acrylic resin film or sheet is disposed on the surface of the preform and molded.

International Publication No. 2004/48435 Pamphlet JP 2009-226657 A

  However, at present, there is a limit to improving the machining accuracy in the die machining method, and minute irregularities of about ± 100 μm remain even if the machining accuracy is increased. Further, in the processing method in which the molding pressure is increased, the occurrence of resin withering is eliminated, but the flow of the resin impregnated in the fiber reinforcing material is increased by applying a high molding pressure to the preform. The flow of the resin causes the reinforcing fibers to meander and cause unevenness on the surface of the FRP.

  Furthermore, the method disclosed in Patent Document 2 is not suitable for high cycle press molding for the following reason. That is, since there is a large difference in thermal shrinkage between the preform and the acrylic resin disposed on the surface of the preform, cracks occur at the interface between the two. At the place where the crack is generated, the resin layer disposed on the surface is easily peeled off, and the surface of the FRP is cracked.

As described above, any method has not yet solved the problem of resin withering on the FRP surface. In this invention, an object to provide a method for producing a fiber-reinforced resin molded article using the free Purifo beam aforementioned disadvantages.

In order to achieve the above object, the method for producing a fiber-reinforced resin molded article of the present invention includes the above-described raw material in a flat portion of a plate-shaped original preform formed by laminating a prepreg impregnated with a resin composition into a fiber reinforcement. When only the preform is heat-cured to form a molded product, the place where the resin withering occurs in the molded product (defect location) on the corresponding one side of the original preform including the specific position specified in advance by the test piece The main configuration is that a film-like resin composition having the same composition as the resin impregnated in the original preform is attached and heated and pressurized .

  In the present invention, it is important that the resin composition used for the film-shaped resin composition has the same composition as the resin impregnated in the original preform. The same composition is obtained by using a main agent, a curing aid and a curing accelerator having the same chemical structure as the resin impregnated in the original preform.

  If the composition of the film-like resin composition is the same as the resin impregnated in the original preform, the difference in the curing time between the resin impregnated in the original preform and the film-like resin composition will be extremely small, and molding FRP can be manufactured without impairing the cycle. Further, since it is excellent in compatibility with the resin impregnated in the original preform, there is no color difference and it is advantageous from the aspect of appearance.

Further, according to a preferred embodiment of the method for producing a fiber-reinforced resin molded product according to the present invention, when the molded product is obtained by heating and curing only the original preform, a place where resin withering occurs in the molded product ( The film-shaped resin composition is pasted at a position corresponding to the defect portion.

Furthermore, according to the preferable form of the manufacturing method of the fiber reinforced resin molded product of the present invention, the area of the film-shaped resin composition is 1.2 to 40 times larger than the area of the defective portion, And it is an area 0.5 times or less with respect to the total surface area in the back surface of the said preform, and the thickness of the said film-form resin composition is 10-150 micrometers.

In the method for producing a fiber-reinforced resin molded article according to the present invention, the resin impregnated in the original preform and the film-like resin composition are preferably epoxy resin compositions, and the epoxy resin It is preferable that toluene bisdimethyl urea is contained as a bisphenol S type epoxy resin and a curing aid.
Furthermore, in the method for producing a fiber-reinforced resin molded article according to the present invention, the film-like resin composition preferably contains a phenoxy resin, and can also contain polyethersulfone. Furthermore, in the method for producing a fiber-reinforced resin molded article according to the present invention, it is preferable that the film-like resin composition viscosity is 1.6 times or more with respect to the viscosity of the resin impregnated in the original preform, Moreover, it is good to make the gel time of the said film-form resin composition 0.7 to 1.21 time with respect to the gel time of resin impregnated in the said original preform.

Moreover, the manufacturing method of the fiber reinforced resin molded product which concerns on this invention heats the preform obtained by the said manufacturing method for 1 to 20 minutes within 100-150 degreeC and 1-15 MPa conditions in a metal mold | die. It is characterized by producing a molded product by applying pressure and curing.

In the present invention, as a preform, by forming a FRP using a preform having a film-like resin composition attached to the back surface thereof, unevenness occurs due to resin withering or the like on the front surface. And high-quality FRP can be obtained. Moreover, by using the said manufacturing method, a yield can also increase and high productivity can be obtained.

It is sectional drawing which shows typically an example of the state (a) and the heating-pressing state (b) which have arrange | positioned the preform which affixed the film-form resin composition on the back surface of this invention in the metal mold | die. It is a perspective view which shows typically an example of the original preform which has not affixed the film-form resin composition on the back surface. It is sectional drawing which shows typically an example of the state (a) and the heating-pressing state (b) which have arrange | positioned the raw preform which has not stuck the film-form resin composition on the back surface in a metal mold | die. It is the perspective view which shows the position of the resin withering, and the expansion perspective view when the position of the resin withering is overlapped (in the balloon). It is a perspective view which shows typically an example of the preform which affixed the film-form resin composition on the back surface of this invention. 5 is a graph used when evaluating the curing behavior of a resin composition to determine gel time (GT) and 100% torque attainment time (tmax).

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be specifically described with reference to the accompanying drawings.
In the present invention, as a result of intensive studies on the problem of unevenness of the FRP surface due to resin withering, the surface of a molded product due to resin withering or the like by using a preform having a specific function and a method for producing FRP using the preform It has been found that the problem of unevenness occurring in can be solved all at once.

  That is, the preform 6 in which the film-like resin composition 7 is pasted on the back surface 9 of the original preform is placed in the mold 1 shown in FIG. 1 for 1 to 20 minutes under the conditions of 100 to 150 ° C. and 1 to 15 MPa. In the meantime, it is heated and pressurized to cure.

  In FIG. 2, the surface indicated by reference numeral 8 is the front (front) surface of the preform 6, and the surface indicated by reference numeral 9 is the back surface of the preform 6. In FIG. 1, reference numeral 4 is a shear edge part of the upper mold 2, and reference numeral 5 is a shear edge part of the lower mold 3. When the shear edge portion 4 of the upper die 2 and the shear edge portion 5 of the lower die 3 are in sliding contact, the end portion of the preform 6 can be accurately formed.

  The inventor of the present invention knew that the production method of the FRP molded in this way suppresses the occurrence of unevenness due to resin erosion on the surface of the FRP obtained by high cycle press molding. When the cause was investigated, it turned out that the preform of this invention is because the film-form resin composition 7 was affixed on the back surface of the original preform. Regarding the identification of the front and back surfaces of the original preform, the surface that forms the surface to be painted or the design surface in the FRP obtained by molding the preform is the front (front) surface. It is. The back side of this surface is the back side.

  By sticking the film-like resin composition 7 to the back surface of the original preform, the resin of the film-like resin composition 7 flows and fills between the preform 6 and the mold at the time of molding. Thereby, since no gap is generated between the preform 6 and the mold 1, a uniform pressure can be applied from the mold 1 to the entire surface of the preform. Since uniform pressure can be applied from the mold to the entire surface of the preform, it is possible to significantly suppress the occurrence of unevenness due to resin withering that has occurred on the surface of the FRP.

  Here, in the present invention, with regard to resin withering, a part where there is no resin layer on the front (front) surface of the FRP and the unevenness of the reinforcing fiber constituting the preform is exposed is a part where resin withering occurs. It is called.

  Moreover, in the preform 6 of the present invention, it is preferable that the place where the film-like resin composition is attached corresponds to a place where defects are likely to occur on the FRP surface. The defect on the FRP table (front) surface is a convex and concave portion generated on the FRP table (front) surface, and is a portion mainly generated due to resin withering.

  In the present invention, the defect portion is a position where a defect is generated on the FRP table (front) surface. In addition, when the film-shaped resin composition is not attached, the position of the front (front) surface of the original preform that will form a defect portion on the FRP front (front) surface is determined as the original preform. The position projected on the back surface of the lens is referred to as the position corresponding to the defective portion. In order to prevent the occurrence of a defective portion on the FRP table (front) surface, it is preferable to attach the film-like resin composition to such a position. A defective part is calculated | required with the following methods.

  As a method for finding out a defective portion of the preform, for example, 20 FRPs are first manufactured under the molding conditions of the present invention on the original preform to which the film-like resin composition is not attached. Next, positioning of the defect of each obtained FRP surface is performed. Then, it is assumed that a region surrounded by the outermost periphery in a region obtained by superimposing all the positions of the respective defects is a defective portion.

  The film-like resin composition 7 is affixed to the back surface of the original preform so as to cover the position corresponding to the defect portion on the FRP surface obtained by the above-described method. In the case where there are a plurality of defective portions apart from each other, the film-shaped resin composition 7 is attached to a position corresponding to each defective portion on the back surface of the original preform.

  Thereby, the preform 6 which suppresses generation | occurrence | production of the unevenness | corrugation by the resin withering which generate | occur | produces on the FRP table | surface (front) surface can be created. The preform 6 of the present invention is placed in a mold and heated and pressurized. Thereby, at the time of shaping | molding by the metal mold | die 1, the molten resin of the film-form resin composition 7 will flow into the space | gap between a preform and a metal mold | die, and the film-form resin composition 7 does not produce a space | gap location. This resin can be easily filled.

As a result, there are no gaps, and uniform pressure can be applied from the mold 1 to the entire preform surface. Then, a uniform pressure is uniformly applied from the mold to the entire preform surface, and the uneven surface due to the resin withering generated on the front surface of the FRP can be reduced.

  Furthermore, in the preform of the present invention, the surface area of the film-like resin composition 7 to be attached to the back surface of the original preform is 1.2 to 40 times the surface area of the defect portion on the FRP table (front) surface. It is desirable that the area be 0.5 times or less the total surface area of the back surface of the preform 6. Furthermore, the thickness of the film-like resin composition 7 is preferably 10 to 150 μm.

  As a method for obtaining the surface area of the defect portion on the FRP surface, for example, the same molding conditions as those performed when the preform of the present invention is used using the original preform to which the film-like resin composition 7 is not attached. Then, 20 FRPs are manufactured. The position of the defect of each obtained FRP surface is performed. And in the area | region obtained by superimposing all the positions of each defect, let the area of the area | region enclosed by outermost periphery be the surface area of the defect location in the FRP surface.

  As the surface area of the film-like resin composition 7 to be attached to the back surface of the original preform, the surface area of the FRP surface is configured to be 1.2 to 40 times as large as the surface area of the defect, and the total surface area of the back surface of the original preform is On the other hand, it is configured to have an area of 0.5 times or less, and the thickness of the film-like resin composition 7 can be configured to a thickness of 10 to 150 μm. By comprising in this way, the effect which suppresses generation | occurrence | production of the unevenness | corrugation by the resin withering which generate | occur | produces on the FRP table | surface (front) surface after shaping | molding becomes remarkable.

  In particular, as a configuration of the film-shaped resin composition 7, the surface area of the film-shaped resin composition 7 is configured to be 5 to 20 times as large as the surface area of the defect portion on the FRP table (front surface), and the preform 6 It is more preferable to configure the area of 0.3 times or less with respect to the total surface area of the back surface and to configure the thickness of the film-like resin composition 7 to a thickness of 20 to 50 μm.

  As the film-like resin composition 7 used in the present invention, a resin composition using a main agent, a curing agent and a curing accelerator having the same chemical structure as the resin impregnated in the original preform is used. Various resins are used for the combination of the resin impregnated in the original preform and the film-like resin composition, and a thermosetting resin is preferable. If it is a thermosetting resin, since a film-like resin composition should just be affixed on an original preform, it is preferable.

  As the thermosetting resin, phenol resin, vinyl ester resin, unsaturated polyester resin, urea resin, melamine resin, alkyd resin, polyurethane, BMI resin, BT resin, and the like can be used, but the thermosetting resin is not limited thereto. An epoxy resin is preferable. Any epoxy resin can be used as the epoxy resin preferably used in the present invention. For example, polyfunctional epoxy resins to increase heat resistance, epoxy resins with a rigid ring structure in the main chain, or low molecular weight epoxy resins or alicyclic to reduce the viscosity of the resin composition Any epoxy resin can be blended depending on the purpose, such as blending the epoxy resin.

The epoxy resin to be blended is, for example, a glycidyl ether type epoxy resin obtained from a compound having a hydroxyl group in the molecule and epichlorohydrin, a glycidylamine type epoxy obtained from a compound having an amino group in the molecule and epichlorohydrin. Resin, glycidyl ester type epoxy resin obtained from epichlorohydrin and compound having carboxyl group in molecule, alicyclic epoxy resin obtained by oxidizing compound having double bond in molecule, or selected from these An epoxy resin in which two or more types of groups are mixed in the molecule is used.

  Specific examples of the glycidyl ether type epoxy resin include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, resorcinol type epoxy resin, phenol novolac type epoxy resin, other trisphenol novolak type epoxy resin, polyethylene glycol Type epoxy resin, polypropylene glycol type epoxy resin, naphthalene type epoxy resin, dicyclopentadiene type epoxy resin, and their positional isomers, substituted groups with alkyl groups and halogens.

  Here, as commercial products of bisphenol A type epoxy resin, EPON 825, jER 826, jER 827, jER 828 (above, manufactured by Mitsubishi Chemical), Epicron 850 (made by DIC), Epototo YD-128 (made by Nippon Steel Chemical Co., Ltd.) DER-331, DER-332 (manufactured by Dow Chemical Company), Bakelite EPR154, Bakelite EPR162, Bakelite EPR172, Bakelite EPR173, and Bakelite EPR174 (above, manufactured by Bakelite AG).

  Commercially available products of bisphenol F type epoxy resins include jER806, jER807, jER1750 (manufactured by Mitsubishi Chemical Corporation), Epicron 830 (manufactured by DIC Corporation), Epototo YD-170, Epototo YD-175 (manufactured by Nippon Steel Chemical Co., Ltd.) ), Bakelite EPR169 (manufactured by Bakerite AG), GY281, GY282, and GY285 (above, manufactured by Huntsman Advanced Material).

  As a commercial product of bisphenol S-type epoxy resin, Epicron EXA-1514 (manufactured by DIC Corporation) can be mentioned. Examples of commercially available resorcinol type epoxy resins include Denacol EX-201 (manufactured by Nagase ChemteX Corporation).

  Examples of commercially available phenol novolac epoxy resins include jER152, jER154 (above, manufactured by Mitsubishi Chemical Corporation), Epicron 740 (made by DIC), EPN179, EPN180 (above, made by Huntsman Advanced Materials), and the like. . Examples of commercially available trisphenol novolak epoxy resins include Tactix 742 (manufactured by Huntsman Advanced Material), EPPN501H, EPPN501HY, EPPN502H, EPPN503H (manufactured by Nippon Kayaku Co., Ltd.), jER1032 (manufactured by Mitsubishi Chemical). It is done.

  Specific examples of the glycidylamine type epoxy resin include tetraglycidyldiaminodiphenylmethanes, glycidyl compounds of aminophenol, glycidylanilines, and glycidyl compounds of xylenediamine. Commercially available products of tetraglycidyldiaminodiphenylmethanes include Sumiepoxy ELM434 (manufactured by Sumitomo Chemical), Araldite MY720, Araldite MY721, Araldite MY9512, Araldite MY9612, Araldite MY9634, Araldite MY9663 (above Huntsman Advanced ER 4) Mitsubishi Chemical Co., Ltd.), Bakelite EPR494, Bakelite EPR495, “Bakelite EPR496, Bakelite EPR497 (above, manufactured by Bakelite AG), and the like.

Commercially available products of aminophenol and aminocresol glycidyl compounds include jER630 (Mitsubishi Chemical Corporation), Araldite MY0500, Araldite MY0510, Araldite MY0600 (manufactured by Huntsman Advanced Materials), Sumiepoxy ELM120, and Sumiepoxy ELM100. (Above, manufactured by Sumitomo Chemical Co., Ltd.). Examples of commercially available glycidyl anilines include GAN, GOT (manufactured by Nippon Kayaku Co., Ltd.) and Bakelite EPR493 (manufactured by Bakelite AG). Examples of the glycidyl compound of xylenediamine include TETRAD-X (manufactured by Mitsubishi Gas Chemical Company).

  Specific examples of the glycidyl ester type epoxy resin include phthalic acid diglycidyl ester, hexahydrophthalic acid diglycidyl ester, isophthalic acid diglycidyl ester, dimer acid diglycidyl ester and various isomers thereof. Examples of commercially available products of diglycidyl phthalate include Epomic R508 (manufactured by Mitsui Chemicals) and Denacol EX-721 (manufactured by Nagase ChemteX). Examples of commercially available hexahydrophthalic acid diglycidyl ester include Epomic R540 (Mitsui Chemicals) and AK-601 (Nippon Kayaku). Examples of commercially available dimer acid diglycidyl ester include jER871 (manufactured by Mitsubishi Chemical Corporation) and Epototo YD-171 (manufactured by Nippon Steel Chemical Co., Ltd.).

Commercially available alicyclic epoxy resins include Celoxide 2021P (Daicel Chemical Industries), CY179 (Huntsman Advanced Materials), Celoxide 2081 (Daicel Chemical Industries), and Celoxide 3000 (Daicel Chemical Industries). Manufactured). Examples of the epoxy resin having an oxazolidone ring in the skeleton include AER4152, AER4151, LSA4311, LSA4313, and LSA7001 (manufactured by Asahi Kasei E-Materials). Examples of the epoxy resin having a naphthalene skeleton in the skeleton include HP-4032, HP-4700 (manufactured by DIC), NC-7300 (manufactured by Nippon Kayaku). Examples of the epoxy resin having a dicyclopentadiene skeleton in the skeleton include XD-100 (manufactured by Nippon Kayaku Co., Ltd.) and HP7200 (manufactured by DIC). Examples of the epoxy resin having an anthracene skeleton in the skeleton include YL7172YX-8800 (above, manufactured by Mitsubishi Chemical Corporation). Examples of the epoxy resin having a xanthene skeleton in the skeleton include EXA-7335 (manufactured by DIC). Among them, an epoxy resin having an SO ₂ structure in the skeleton such as a bisphenol S type epoxy resin is preferable.

A bisphenol S-type epoxy resin containing an epoxy resin having an SO ₂ structure in the chemical structural formula is preferable in terms of excellent quick curing properties. The epoxy resin having the SO ₂ structure can also be obtained by prereacting an epoxy resin and 4-4′-diamidediphenylsulfone. As the epoxy resin curing agent preferably used in the present invention, amine type, acid anhydride, phenol, mercaptan type, Lewis acid amine complex, onium salt, imidazole, etc. are used, as long as they can cure the epoxy resin. Any structure may be used. Preferred are aromatic amines such as diaminodiphenylmethane and diaminodiphenylsulfone, imidazole derivatives, dicyandiamide, tetramethylguanidine, thiourea-added amines and isomers and modifications thereof. Particularly preferred is dicyandiamide.

These curing agents can be combined with an appropriate curing aid in order to increase the curing activity. Preferred examples include dicyandiamide and 3-phenyl-1,1-dimethylurea, 3- (3,4-dichlorophenyl) -1,1-dimethylurea (DCMU), 3- (3-chloro-4-methylphenyl). Examples in which urea derivatives such as 1,1-dimethylurea, 2,4-bis (3,3-dimethylureido) toluenemethylenediphenylbis (dimethylureido), phenyldimethylurea (PDMU) are combined as a curing aid, Examples of combining tertiary anhydrides with acid anhydrides and novolak resins as curing aids, urea compounds such as imidazole compounds and phenyldimethylurea (PDMU) with diaminodiphenylsulfone, and amine complexes such as monoethylamine trifluoride and amine trichloride complexes There is an example of combining as a curing aid. 2,4-bis (3,3-dimethylureido) toluene is Omicure 24 (manufactured by PTI Japan), and methylenediphenylbis (dimethylureido) is Omicure 52 (manufactured by PTI Japan) As industrially available. A preferred curing aid is 3- (3,4-dichlorophenyl) -1,1-dimethylurea (DCMU). More preferred are dicyandiamide and phenyldimethylurea or toluenebisdimethylurea. In particular, the combination of dicyandiamide and toluene bisdimethylurea is more preferable in terms of fast curability and heat resistance.

  Moreover, various additives can be added to the film-like resin composition used in the present invention. When the film-shaped resin composition is an epoxy resin composition, it is preferable to add a thermoplastic resin. When a thermoplastic resin is contained in the film-like epoxy resin composition, it is possible to prevent the film-like resin composition from being impregnated into the original preform. Moreover, at the time of shaping | molding by a metal mold | die, a film-form resin composition flows into the clearance gap part of a preform and a metal mold | die, and it becomes easy to fill a clearance gap. As a result, it is possible to sufficiently exhibit the effect of suppressing the occurrence of unevenness on the front surface of the FRP due to the effect of resin depletion. Various thermoplastic resins are used. Examples include phenoxy resin, polyether sulfone, polyvinyl formal, and the like. Preferable are phenoxy resin and polyether sulfone. Furthermore, as a film-form resin composition used for this invention, the form coated on the release paper can be used.

  The viscosity of the film-like resin composition used in the present invention is preferably 5,000 to 1,000,000 Pa · sec at 30 ° C. If it is less than 5,000 Pa · sec, a part of the film-like resin composition remains on the release paper when the release paper is peeled off after the film-like resin composition coated on the release paper is pasted on the original preform. Resin withering occurs on the surface of the product. If it exceeds 1,000,000 Pa · sec, the reactivity is lowered and it takes time to cure the film-like resin composition, so the productivity of the molded product is lowered. Preferably, it is 10,000 to 500,000 Pa · sec.

In addition, it is preferable that the viscosity of the film-shaped resin composition is higher than the resin viscosity of the original preform because the resin can be prevented from withstanding. The viscosity of the film-like resin composition is preferably 1.6 times or more the resin viscosity of the original preform. If it is 1.6 times or more, the occurrence of resin withering is significantly reduced.
The gel time of the film-like resin composition is preferably 0.7 to 1.21 times the gel time of the resin impregnated in the original preform. Within the range, it is preferable that the molding cycle has a small change width.

As a manufacturing method for obtaining the preform in the present invention, the prepreg is cut according to the dimensions of the FRP, and the prepreg cut according to a predetermined laminated structure is laminated to obtain an original preform. Next, the film-like resin composition coated on the release paper is attached to the back surface of the original preform. The preform with the film-like resin composition attached thereto is disposed in a mold, and can be shaped into a desired FRP shape by heating and pressing in the mold. The film-like resin composition can be attached to the back surface of the preform after shaping the original preform.

  Carbon fiber, glass fiber, aramid fiber, boron fiber, etc. can be used as the prepreg reinforcing fiber used in the preform. In addition, as a reinforced fiber, it is preferable to use the carbon fiber excellent in specific strength and specific elasticity. As the form of the reinforcing fiber, a unidirectional material in which long fibers are aligned in one direction and a woven material having a woven shape can be used, but a unidirectional material is preferably used from the viewpoint of surface smoothness.

Next, the FRP manufacturing method according to the present invention will be specifically described with reference to FIG. 1 showing an example of an embodiment of the present invention.
First, as shown in FIG. 1 (a), after adjusting the mold 1 to a temperature equal to or higher than the curing temperature of the matrix resin impregnated with the prepreg, a preform 6 having a film-like resin composition 7 attached to the back surface is prepared. Place on the lower mold 3. Next, as shown in FIG.1 (b), between the upper mold | type 2 and the lower mold | type 3 is closed, and the preform 6 is heat-pressed and shape | molded. The matrix resin fills all the cavities inside the shear edge portions 4 and 5. In addition, the film-like resin composition 7 attached to the back surface of the preform 6 flows into the gap between the preform 6 and the molding surface of the mold 1, and the gap is formed into the film-like resin composition. The product 7 can be easily filled with resin.

  In order to suppress the flow of the resin in the mold 1 and prevent the fiber meandering from occurring in the FRP, the surface area of one side of the preform 6 before being put into the mold 1 is shaped on one side of the preform 6. It is preferable to make the structure close to the surface area of the molding surface of the mold 1 to be performed.

  Here, the single-sided surface area of the preform 6 is one of the two molding surfaces constituting the FRP (the surface in contact with the upper mold 2 and the lower mold 3), which is one molding surface for molding the one-side of the preform. Of the surface area. Although depending on the mold, FRP has a structure in which two surfaces are formed by molding. Therefore, the surface area of each surface of the preform 6 to be molded is made close to the surface area of the molding surface for molding each surface. It is desirable to keep it.

  Specifically, between the surface area S1 on one side of the preform 6 and the surface area S2 on the molding surface of the mold 1 which is shaped by contacting the one surface of the preform 6 when the mold 1 is closed. In addition, it is preferable that the ratio S1 / S2 between S1 and S2 is 0.8 to 1.

  If the ratio S1 / S2 is 0.8 or more, the flow of the resin inside the mold 1 can be easily suppressed, and fiber meandering is less likely to occur during molding. If the ratio S1 / S2 is greater than 1, the peripheral edge of the preform 6 protrudes from the mold 1. When the mold 1 is closed, the protruding part of the preform 6 becomes an obstacle to pressurization with the mold 1 or causes a volume shortage as a preform in molding the FRP. . Further, at the time of heating and pressurizing, the preform 6 is folded in the mold 1 and the fiber orientation is disturbed. However, if the ratio S1 / S2 is set to 1 or less, these problems can be prevented.

  In particular, when obtaining a high-quality FRP, it is preferable that the volume and height of the preform 6 be configured in a shape close to the FRP obtained after molding. Specifically, the volume of the preform 6 put in the mold 1 is 100 to 120% of the volume of the obtained FRP, and the thickness of the preform 6 is set to the thickness of the obtained FRP. It is preferable to make it 100 to 150%.

  When the volume of the preform 6 put into the mold 1 is less than 100% of the volume of the obtained FRP, it is difficult to apply sufficient pressure to the preform 6. On the other hand, when the volume of the preform 6 which is a molding material put into the mold 1 exceeds 120% of the volume of the FRP to be obtained, airtightness is obtained in the mold 1 when the mold 1 is closed. In the previous state, the preform 6 which is a molding material easily flows out of the mold 1.

  Moreover, when the thickness of the preform 6 is less than 100% of the thickness of the FRP to be obtained, and when it exceeds 150%, it is difficult to uniformly press the entire surface of the preform 6 with the mold 1. Here, the thickness of the preform 6 and the thickness of the obtained FRP are thicknesses obtained by averaging the thickness of the preform 6 and the obtained FRP, respectively.

The curing temperature is desirably 100 to 150 ° C. If the curing temperature is 100 ° C. or higher, the curing reaction can be sufficiently caused. If the molding temperature is 150 ° C. or lower, the viscosity of the matrix resin impregnated in the preform 6 does not become too low, and the gold Excessive flow of the matrix resin in the mold 1 can be suppressed. And the outflow of the resin from the metal mold | die 1 and the meandering of a fiber can be suppressed, and high quality FRP can be obtained.

  When the curing temperature is lower than 100 ° C., the curing reaction cannot be caused, and the desired shape cannot be formed. On the other hand, when the curing temperature is higher than 150 ° C., the viscosity of the matrix resin becomes too low, and the matrix resin causes excessive flow in the mold 1. Then, due to excessive flow of the matrix resin, meandering occurs in the fiber, and high quality FRP cannot be obtained.

  The pressure at the time of molding is preferably 1 to 15 MPa. If a pressure of 1 MPa or more can be applied to the preform 6, an appropriate flow of the resin can be obtained, and appearance defects and voids due to poor outgassing can be prevented. Since the preform 6 is firmly attached to the mold during molding, a good appearance quality can be obtained. On the contrary, if the pressure applied at the time of molding is less than 1 MPa, an appropriate flow cannot be generated in the resin, and the molding is performed in a state where gas escape is poor. And the appearance defect and generation | occurrence | production of a void will arise.

  Moreover, if the pressure applied at the time of shaping | molding is larger than 15 MPa, resin will flow more than needed and the meandering of a reinforced fiber will be generated with the flow of resin. The meandering of the reinforcing fibers causes the appearance defect of the FRP. Further, a load more than necessary from the mold 1 is applied to the preform 6, which causes deformation outside the design. However, these problems can be prevented if the pressure applied during molding is 15 MPa or less.

  Moreover, as for the hardening time in the manufacturing method of this invention, it is desirable that it is 1 to 20 minutes. By molding under such conditions, an excellent quality FRP can be produced with high productivity. If the curing time is shorter than 1 minute, the FRP having a desired strength and shape cannot be obtained because the molding is performed with insufficient curing. On the other hand, if the curing time is longer than 20 minutes, the resin is cured too much in the mold, and cracks and the like are generated.

  According to the manufacturing method of the present invention described above, it is possible to suppress the occurrence of an inappropriate state in the mold 1 at the time of molding, and to produce a high-quality FRP with reduced appearance defects and poor performance. Can be obtained by sex.

  In addition, the manufacturing method of this invention is not limited to the method of using the metal mold 1 illustrated in FIG. As described above, a mold other than the mold 1 shown in FIG. 1 can be used as long as it can be cured in a short time under high temperature and high pressure.

  Hereinafter, based on the Example and comparative example of this invention, this invention is demonstrated further more concretely. However, the configuration of the present invention is not limited by the following description.

  In addition, the list of the implementation conditions and evaluation results of Examples 1 to 11 and Comparative Examples 1 to 4 is shown in Tables 1 to 3. Table 1 shows the epoxy resin compositions of the matrix resin and the film-like resin composition impregnated in the prepreg used in Examples 1 to 11 and Comparative Examples 1 to 4.

<Prepreg>
50 parts by mass of EPICLON EXA1514, a bisphenol S type epoxy resin manufactured by DIC Corporation, 50 parts by mass of jER828, a bisphenol A type epoxy resin manufactured by Japan Epoxy Resin Co., Ltd., and polyethersulfone manufactured by BASF Corporation 7 Ultra Zone E2020P
7 parts by mass of jER Cure DICY15, which is dicyandiamide manufactured by Japan Epoxy Resin Co., Ltd., 4 parts by mass of Omicure 24, which is toluenebisdimethylurea manufactured by PTI Japan, Inc. Matrix resin A was obtained.
Pyrofil TR50S15L GF, which is carbon fiber manufactured by Mitsubishi Rayon Co., Ltd., was used as the fiber reinforcement. A unidirectional prepreg P1 was prepared by impregnating the matrix resin A into the fiber reinforcement having a fiber basis weight of 250 g / m ^{2 with} a resin content of 30 parts by mass. This prepreg P1 was used for preparation of a preform.

100 parts by weight of jER828, a bisphenol A type epoxy resin manufactured by Japan Epoxy Resin Co., Ltd., Seika Cure S (ground product), 4-4′-diamidediphenylsulfone (DDS) manufactured by Wakayama Seika Kogyo Co., Ltd. 72 parts by mass of a pre-reacted epoxy resin that was pre-reacted at 160 ° C. for 6 hours, and 28 parts by mass of jER828, a bisphenol A type epoxy resin manufactured by Japan Epoxy Resin Co., Ltd., manufactured by BASF Corporation 7 parts by mass of Ultrazone E2020P, which is a polyethersulfone, 7 parts by mass of jER Cure DICY15, which is dicyandiamide manufactured by Japan Epoxy Resin Co., Ltd., and toluenebisdimethylurea manufactured by PTI Japan Ltd. A matrix resin B was obtained by blending 4 parts by mass of certain Omicure 24 and these. This matrix resin B is impregnated with Pyrofil TR50S15L GF, which is a carbon fiber manufactured by Mitsubishi Rayon Co., Ltd., in a fiber reinforcing material to prepare a unidirectional prepreg P2 having a fiber basis weight of 250 g / m ² and a resin content of 30 parts by mass. This was used to create the preform.

<Film-like resin composition>
An epoxy resin composition F1 is used as the film-like resin composition used in Examples 1 to 7 and Comparative Examples 1 and 2, and the composition thereof is EPICLON EXA1514, which is a bisphenol S type epoxy resin manufactured by DIC Corporation. 65 parts by mass, 35 parts by mass of jER828, a bisphenol A type epoxy resin manufactured by Japan Epoxy Resin Co., Ltd., 5 parts by mass of phenototo YP50S, a phenoxy resin manufactured by Toto Kasei Co., Ltd., Japan Epoxy Resin Co., Ltd. 7 parts by mass of jER Cure DICY15, which is a dicyandiamide manufactured by, and 4 parts by mass of Omicure 24, which is toluenebisdimethylurea, manufactured by PTI Japan KK, and a resin composition in which these are blended.

  An epoxy resin composition F2 is used as the film-like resin composition used in Example 8. The composition is 65 parts by mass of EPICLON EXA1514, a bisphenol S type epoxy resin manufactured by DIC Corporation, 35 parts by mass of jER828, a bisphenol A type epoxy resin manufactured by Japan Epoxy Resin Co., Ltd. 7) parts by mass of jER Cure DICY15, which is dicyandiamide, and 4 parts by mass of Omicure 24, which is toluenebisdimethylurea, manufactured by PITI Japan, Inc.

  As a film-like resin composition used in Example 9, an epoxy resin composition F3 having the same composition as the matrix resin A used in the prepreg P1 was used.

  As the film-like resin composition used in Example 10, an epoxy resin composition F4 was used. The composition was 65 parts by mass of EPICLON EXA1514, a bisphenol S type epoxy resin manufactured by DIC Corporation, Japan Epoxy Resin ( 35 parts by mass of jER828, a bisphenol A type epoxy resin manufactured by Co., Ltd., 5 parts by mass of phenototo YP50S, a phenoxy resin manufactured by Toto Kasei Co., Ltd., jER Cure DICY15, a dicyandiamide manufactured by Japan Epoxy Resin Co., Ltd. 5 parts by mass, 3 parts by mass of Omicure 24, which is toluenebisdimethylurea manufactured by PTI Japan, and a resin composition in which these were blended were used.

As the film-like resin composition used in Example 11, the epoxy resin composition F6 is used, and the composition thereof is the same epoxy resin composition as the matrix resin B used in the prepreg P2.

  Epoxy resin composition F5 is used as the film-like resin composition used in Comparative Example 3, and its composition is 65 parts by mass of EPICLON EXA1514, a bisphenol S type epoxy resin manufactured by DIC Corporation, Japan Epoxy Resin ( 35 parts by mass of jER828 which is a bisphenol A type epoxy resin manufactured by Co., Ltd., 5 parts by mass of phenototo YP50S which is a phenoxy resin manufactured by Tohto Kasei Co., Ltd., 4-4′− manufactured by Wakayama Seika Kogyo Co., Ltd. A resin composition in which 24 parts by mass of Seika Cure S (pulverized product), which is diamide diphenyl sulfone (DDS), was blended with these was used. Each obtained epoxy resin composition F5 was coated on a release paper using a resin coater to prepare a film-like resin composition.

<30 ° C viscosity measurement>
The viscosity at 30 ° C. of the resin composition used for the film-like resin composition was measured by the method shown below.
Equipment: DSR-200 manufactured by Rheometrics Co., Ltd.
Measurement mode: Parallel plate (25mm φ, gap 0.5mm)
Frequency: 1Hz

<Measurement of gel time and 100% torque arrival time with curast meter>
The gel time (GT) and 100% torque attainment time (tmax) of the resin composition used for the film-shaped resin composition were measured by the following methods.
Equipment: Curator Meter IIF-HT manufactured by Nigo Corporation
Measurement mode: PP (peak measurement mode)
Frequency: ± 3 °
Measurement temperature: 140 ℃

  A time-torque curve as shown in FIG. 6 is obtained from the measured values. Gel time (GT) is the time for the torque value to rise from 0 to a positive value. The 100% torque attainment time (tmax) is defined as the maximum time at which the torque does not change from the curve.

<Identification of defect location, surface area of defect location>
The prepreg is cut with a width of 0.5 m and a length of 1.0 m. The cut prepreg was laminated with a laminated structure of 0 ° / 90 ° / 90 ° / 90 ° / 0 °. The laminated prepregs were shaped by heating and pressurizing using a preform apparatus, and 20 original preforms having the shape illustrated in FIG. 2 were produced. In FIG. 2, the surface indicated by reference numeral 8 is the surface of the original preform, and the surface indicated by reference numeral 9 is the back surface of the original preform. The film-shaped resin composition 7 is not attached to this original preform. As the mold, the mold 1 illustrated in FIG. 1 was used.

  As illustrated in FIG. 3, the upper mold 2 and the lower mold 3 of the mold 1 are heated in advance to 140 ° C., the original preform is placed on the lower mold 3, and the upper mold 2 is immediately lowered to mold the mold. 1 was closed and applied with a pressure of 4 MPa for 5 minutes by heating and pressing to cure, and after curing, the mold 1 was taken out to obtain 20 FRPs.

  As shown in FIG. 4, resin withering occurred at the center of the front (front) surface 8 of all the FRPs obtained. The position of each FRP withering the resin was determined. Resin withering occurring on the surface 8 of each FRP is indicated by different hatching in the partially enlarged view of FIG. Therefore, as shown in the partially enlarged view of FIG. 4, defects that occur on the front surface 8 of each FRP are overlapped by superimposing all the resin depletion sites that have occurred on the front surface 8 of each FRP. Location 10 was identified.

That is, all the portions of the resin withering indicated by different hatching were overlapped, and a portion obtained when the overlapped region was surrounded by the outermost periphery was defined as a defective portion. And the position of the part made into the defect location was performed. Moreover, the area of the area | region surrounding the outermost periphery of a defect location was calculated | required as a surface area of a defect location. The surface area of the defect site obtained at this time was 0.002 m ² .

[Example 1]
The prepreg P1 is cut to have a width of 0.5 m and a length of 1.0 m. The five cut prepregs were laminated in a 0 ° / 90 ° / 90 ° / 90 ° / 0 ° laminated structure. Next, using the film-like resin composition 7 made of the epoxy resin composition F1 having a thickness of 35 μm and a surface area of 0.02 m ² on the surface to be the back surface of the original preform, 100% of the position corresponding to the defective portion is covered. Pasted on. Subsequently, the laminated structure to which the film-like resin composition 7 was attached was shaped by heating and pressurizing using a preform apparatus, and 20 preforms having the shape illustrated in FIG. 5 were produced.

  In FIG. 5, the surface indicated by reference numeral 8 is the front (front) surface of the preform 6, and the surface indicated by reference numeral 9 is the back surface of the preform 6. A region surrounded by a dotted line indicated by reference numeral 11 is a position corresponding to a defective portion.

The total surface area on the back surface of the preform 6 is 0.5 m ² . As a mold for manufacturing a molded product, the mold 1 illustrated in FIG. 1 was used. The upper mold 2 and the lower mold 3 of the mold 1 are preheated to 140 ° C., the preform 6 is placed on the lower mold 3, the upper mold 2 is immediately lowered, the mold 1 is closed, and a pressure of 4 MPa. Was added and heated and pressed for 5 minutes to cure. Twenty FRPs obtained from the mold 1 after curing were prepared. Regarding the unevenness of the surface due to resin withering or the like on the surface of the obtained FRP, the presence or absence of unevenness was visually confirmed. Then, the number of FRPs in which one or more resin withering and surface irregularities occurred was counted. The implementation conditions and measurement results are shown in Table 2.

[Example 2]
An FRP was prepared in the same manner as in Example 1 except that 50% of the defective portions were covered with the film-like resin composition 7 composed of the epoxy resin composition F1, and evaluation was performed in the same manner as in Example 1. The implementation conditions and measurement results are shown in Table 2.

[Examples 3 to 5]
An FRP was prepared in the same manner as in Example 1 except that the surface area of the film-like resin composition 7 composed of the epoxy resin composition F1 was varied, and evaluation was performed in the same manner as in Example 1. The implementation conditions and measurement results are shown in Table 2.

[Examples 6 to 7]
An FRP was prepared in the same manner as in Example 1 except that the thickness of the film-like resin composition 7 composed of the epoxy resin composition F1 was changed, and evaluation was performed in the same manner as in Example 1. The implementation conditions and measurement results are shown in Table 2.

Example 8
As the epoxy resin composition F2, FRP was prepared in the same manner as in Example 1 except that the film-like resin composition 7 containing no phenoxy resin was used from the epoxy resin composition F1, and evaluated in the same manner as in Example 1. went. The implementation conditions and measurement results are shown in Table 2.

Example 9
An FRP was prepared in the same manner as in Example 1 except that the film-like resin composition 7 was an epoxy resin composition F3 having the same composition as the matrix resin A used in the prepreg P1, and the same as in Example 1. Was evaluated. The implementation conditions and measurement results are shown in Table 2.

Example 10
An FRP was prepared in the same manner as in Example 1 except that the film-shaped resin composition 7 was an epoxy resin F4 in which the mass parts of the curing agent and the curing accelerator differed from those in the epoxy resin composition F1. Evaluation was performed in the same manner as above. The implementation conditions and measurement results are shown in Table 2.

Example 11
An FRP was prepared in the same manner as in Example 1 except that the film-like resin composition 7 was the same epoxy resin composition F6 as the matrix resin B used in the prepreg P2, and the same as in Example 1. Evaluation was performed. The implementation conditions and measurement results are shown in Table 2.

[Comparative Example 1]
An FRP was prepared in the same manner as in Example 1 except that the film-like resin composition 7 composed of the epoxy resin composition F1 was attached to the front (front) surface of the original preform. Evaluation was performed in the same manner as above. On the surface of the obtained FRP (front), the occurrence of resin withering was not observed, but it was found that there was unevenness at the boundary where the film-like resin composition 7 was attached. The implementation conditions and measurement results are shown in Table 3.

[Comparative Example 2]
A film-like resin composition 7 composed of the epoxy resin composition F1 is applied to the entire surface of the original preform, and the FRP is manufactured in the same manner as in Example 1 except for the other structure. Then, the evaluation was performed in the same manner as in Example 1. The implementation conditions and measurement results are shown in Table 3. In all of the obtained FRPs, it was observed that resin withering occurred on the front (front) surface.

[Comparative Example 3]
FRP was produced in the same manner as in Example 1 except that the film-shaped resin composition 7 was an epoxy resin composition F5 having a different chemical structure of the curing agent and the curing accelerator in the epoxy resin composition F1. Evaluation was performed in the same manner as in Example 1. The implementation conditions and measurement results are shown in Table 3. In all of the obtained FRPs, it was observed that resin withering occurred on the front (front) surface.

[Comparative Example 4]
Although the kind of prepreg to be used is prepreg P1, the film-shaped resin composition 7 is not affixed on the original preform. For other configurations, FRPs were produced in the same manner as in Example 1 and evaluated in the same manner as in Example 1. The implementation conditions and measurement results are shown in Table 3. In all of the obtained FRPs, it was observed that resin withering occurred on the front (front) surface.

  As shown in Table 2, in Examples 1 to 11, there was a case where a maximum of 5 resin withering occurred, but the number was not a problem as FRP. In the case of Example 2, the coating rate (%) when the film-shaped resin composition is coated on the defective portion 10, that is, the area of the defective portion 10 is covered with the film-shaped resin composition 7. The area ratio is 50%. Thus, it can be seen that if the half of the area of the defective portion 10 is covered with the film-shaped resin composition 7, resin withering occurs frequently, but the number of resin withering (4) is the matrix resin. It was less than the number of occurrence of resin withering (5) in Example 11 in which B was used as a film-like resin composition, and was in a range that could be sufficiently put into practical use.

  The number of irregularities on the FRP surface was zero in all examples. Thus, the effect by sticking a film-form resin composition on the back surface of a prepreg is good. In particular, in Example 1, the number of occurrences of resin withering and the number of irregularities on the FRP surface were both 0, and a very high quality in which the surface smoothness state was called class A after coating was obtained.

  Moreover, even if it covers with the film-form resin composition 7 which has a magnitude | size 50 times or 150 times with respect to the area of the defect location 10, ie, a surface area ratio (times) is set to 50 or 150, it can suppress resin withering. However, it can be seen that it does not produce a significant effect. Furthermore, the ratio of the area of the film-like resin composition 7 to the total surface area on the back surface of the preform 6, that is, the surface area ratio (times) on the back surface of the preform, is larger than that of 0.04 in Example 1 in Example 3. It was also found that the effect is not higher than that in the case of Example 1 when various modifications are made by making the structure small as described above or by making it large as in Examples 4 and 5.

  Even if paying attention to the thickness of the film-like resin composition 7, it is configured to be thinner than 35 μm in the case of Example 1 as in Example 6 or thick as in Example 7. The effect was not higher than the case.

  As shown in Table 1 and Table 2, with respect to the experimental results in Examples 1 to 11, when the film-shaped resin composition 7 was attached to the front (front) surface of the original preform, In Comparative Example 1, the number of resin withering was zero, but there were 20 irregularities on the FRP table (front) surface. Further, in Comparative Example 2, as many as 20 resin withers were present. In Comparative Example 4 in which the film-shaped resin composition 7 was not attached to the original preform, there were 20 resin dies. Further, even when the film-shaped resin composition 7 is attached to the back surface of the original preform, the film-shaped resin composition of Comparative Example 3 having a different composition is used although it is the same epoxy resin composition as Comparative Example 1. In Comparative Example 3 used, 20 pieces of resin withered existed.

  Thus, on the back side of the original preform, the film-like resin composition 7 is attached to a position corresponding to the defective portion, thereby suppressing the resin withering effect, and occurs on the FRP table (front) surface. The effect of suppressing unevenness is exceptional.

  Since this invention can manufacture FRP with the outstanding surface quality with high productivity, it can be used conveniently for manufacture by high cycle press molding of FRP for uses such as automobile parts.

  DESCRIPTION OF SYMBOLS 1 ... Mold, 2 ... Upper mold, 3 ... Lower mold, 4 ... Shear edge part, 5 ... Shear edge part, 6 ... Preform, 7 ... Film-like resin composition 8 ・ ・ ・ Preform surface 9 ・ ・ ・ Preform backside 10 Defective part 11 Defective part (preform back)

Claims (13)

In a flat portion of a plate-shaped raw preform formed by laminating a prepreg impregnated with a resin composition on a fiber reinforcement , when the raw preform alone is heat-cured to form a molded product, the resin is not withered in the molded product. A film-like resin composition having the same composition as that of the resin impregnated in the original preform is formed on one side corresponding to the original preform including the specific position where the occurrence location (defect location) is previously specified by the test piece. A method for producing a fiber-reinforced resin molded article that is attached and heated and pressed . When the molded article is heated curing only the original preform, at a position corresponding to the location (defective portion) in which dead resin occurs in the molded article of claim 1, wherein the paste the film-like resin composition Manufacturing method of fiber reinforced resin molded product . The area of the film-like resin composition is 1.2 to 40 times as large as the area of the defective portion, and 0.5 times or less of the total surface area on the back surface of the preform. The method for producing a fiber-reinforced resin molded article according to claim 1 , wherein the film-shaped resin composition has a thickness of 10 to 150 μm. The method for producing a fiber-reinforced resin molded article according to any one of claims 1 to 3 , wherein the resin impregnated in the original preform and the film-like resin composition are epoxy resin compositions. The method for producing a fiber-reinforced resin molded article according to claim 4 , wherein the viscosity of the film-like resin composition is 1.6 times or more than the viscosity of the resin impregnated in the original preform. The method for producing a fiber-reinforced resin molded article according to claim 4 or 5 , wherein the gel time of the film-like resin composition is 0.7 to 1.21 times the gel time of the resin impregnated in the original preform. The method for producing a fiber-reinforced resin molded article according to any one of claims 4 to 6 , wherein the epoxy resin composition contains a bisphenol S-type epoxy resin as a main agent and toluenebisdimethylurea as a curing aid. The method for producing a fiber-reinforced resin molded article according to claim 5 , wherein the film-shaped resin composition comprises a phenoxy resin. 6. The method for producing a fiber-reinforced resin molded article according to claim 5, wherein the film-like resin composition comprises polyether sulfone. The method for producing a fiber-reinforced resin molded article according to any one of claims 1 to 4 , wherein the film-like resin composition contains bisphenol S-type epoxy resin as a main agent and toluenebisdimethylurea as a curing aid. The method for producing a fiber-reinforced resin molded article according to any one of claims 1 to 5 , wherein the film-like resin composition comprises a phenoxy resin. The method for producing a fiber-reinforced resin molded article according to any one of claims 1 to 5 , wherein the film-like resin composition comprises polyether sulfone. The preform obtained by the method for producing a fiber-reinforced resin molded product according to any one of claims 1 to 12 is heated for 1 to 20 minutes in a mold at 100 to 150 ° C and 1 to 15 MPa. A method for producing a fiber-reinforced resin molded product, which is cured by pressing to produce a molded product.

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