JP2015168221A - Manufacturing method of fiber reinforced plastic molding - Google Patents

Abstract

A method for producing a homogeneous fiber-reinforced plastic molded article having excellent heat resistance and mechanical properties is provided.
A process for preparing a defoamed mixture by mixing short fibers with heat-melted bisallylnadiimide, mixing and stirring under vacuum, forming the defoamed mixture into a film, cooling, and A step of producing a fiber-containing resin film, a step of laminating the short fiber-containing resin film and a reinforced fiber fabric, producing a laminate, and heating the laminate to the melting temperature of the bisallylnadiimide. Pressure or reduced pressure, impregnating the reinforcing fiber fabric while melting the bisallylnadiimide in the short fiber-containing resin film, and heating the laminate to the curing temperature of the bisallylnadiimide, And a step for curing the bisallylnadiimide in the body.
[Selection] Figure 1

Description

  The present invention relates to a method for producing a fiber-reinforced plastic molded body.

Conventionally, metal materials have been used as structural materials for aircraft, rockets, space equipment and the like, but fiber reinforced plastics have been used as an alternative to metal materials from the viewpoint of weight reduction. With the expansion of the use of such fiber reinforced plastics, fiber reinforced plastics having a heat resistant temperature of 300 ° C. or higher are required.
The fiber reinforced plastic is generally a composite material obtained by impregnating and curing a matrix resin such as an epoxy resin, a phenol resin, or a cyanate resin in a fiber reinforcement, and its heat resistance temperature and use environment are approximately 200 ° C. or less. It is.

As a fiber reinforced plastic having a heat resistant temperature of 300 ° C. or higher, a fiber reinforced plastic using a condensation reaction type curable imide resin or the like as a matrix resin is known.
However, fiber reinforced plastics using condensation-reactive curable imide resins generate reaction by-products such as water during the production process, particularly condensation polymerization of condensation-reactive curable imide resins, and these remain as voids. As a result, the strength of the fiber reinforced plastic is reduced. Moreover, since this fiber reinforced plastic needs to be molded at a high temperature of 350 ° C. or higher, there is a problem that the cost increases and the productivity decreases. Development of fiber reinforced plastic using thermosetting polyimide that can suppress generation of reaction by-products such as water has been carried out, but the problem of high molding temperature remains.

  Therefore, Patent Document 1 proposes a method for producing a fiber-reinforced plastic molded body using bisallyldidiimide, which can be melted at a relatively low temperature of 180 ° C. or lower and can be molded at a curing temperature of 300 ° C. or lower, as a matrix resin. ing. In Patent Document 1, a prepreg in which a fiber reinforcement (carbon fiber, glass fiber, etc.) is impregnated with bisallylnadiimide is manufactured, and a fiber-reinforced plastic molded body is manufactured by laminating the prepreg and pressing and heating. ing.

JP 2004-262950 A

However, in the method of Patent Document 1, several problems occur when producing a prepreg. For example, when bisallylnadiimide is heated and melted, air is taken in, and bubbles are included in the molten bisallylnadiimide. In addition, in order to improve the impregnation property of molten bisallyl nadiimide to fiber reinforcement, viscosity adjustment may be performed by adding a solvent, but when the fiber reinforced material is impregnated with molten bisallyl nadiimide, the solvent volatilizes. There are things to do. These bubbles and volatile components disturb the arrangement of the fiber reinforcement when the fiber reinforcement is impregnated with molten bisallyl nadiimide. As a result, a homogeneous prepreg cannot be obtained, and the fiber-reinforced plastic molded body produced using this prepreg has a portion with insufficient mechanical properties.
On the other hand, a method for producing a fiber reinforced plastic molded body by resin film infusion (RFI) is also known, but it is mainly used in combination with a prepreg, and if the prepreg is not used, the fiber reinforced material is sufficiently impregnated with resin. Therefore, a homogeneous fiber-reinforced plastic molded body cannot be obtained.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for producing a homogeneous fiber-reinforced plastic molded article excellent in heat resistance and mechanical properties.

  As a result of diligent research to solve the above problems, the inventors of the present invention prepared from a defoamed mixture obtained by blending short fibers into heat-melted bisallylnadiimide and mixing and stirring under vacuum. By laminating the short fiber-containing resin film with the reinforced fiber fabric and heat molding, it is possible to obtain a homogeneous fiber reinforced plastic molded body by preventing disorder of the arrangement of the fiber reinforcement due to bubbles and volatile components. I found it.

That is, the present invention is a step of blending short fibers in heat-melted bisallylnadiimide, mixing and stirring under vacuum to prepare a defoamed mixture,
Forming the defoamed mixture into a film and cooling to produce a short fiber-containing resin film;
Laminating the short fiber-containing resin film and the reinforced fiber fabric, and producing a laminate,
Heating the laminate to the melting temperature of the bisallylnadiimide, pressurizing or depressurizing, and impregnating the reinforcing fiber fabric while melting the bisallylnadiimide in the short fiber-containing resin film;
And heating the laminated body to the curing temperature of the bisallylnadiimide, and curing the bisallylnadiimide in the laminated body.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the homogeneous fiber reinforced plastic molding excellent in heat resistance and a mechanical characteristic can be provided.

3 is a flowchart of a method for manufacturing the fiber-reinforced plastic molded body of Embodiment 1. FIG. It is a figure for demonstrating the preparation process of a laminated body, a fusion | melting / impregnation process, a hardening process, and a demolding process. It is a figure for demonstrating the manufacturing method of a hemispherical FRP molded object. 3 is a graph showing the Tg measurement results of the FRP molded body produced in Example 1. FIG.

Embodiment 1 FIG.
Hereinafter, preferred embodiments of a method for producing a fiber-reinforced plastic molded body of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a flow of a method for manufacturing a fiber-reinforced plastic molded body according to the present embodiment.
As shown in FIG. 1, the method for producing a fiber-reinforced plastic molded body according to the present embodiment includes a defoaming mixture preparation step, a short fiber-containing resin film preparation step, a laminate preparation step, a melting / impregnation step, and a curing step. Including a process and a demolding process.
Hereinafter, each step will be described in detail.

(Preparation process of defoaming mixture)
The defoamed mixture is prepared by blending short fibers in heat-melted bisallylnadiimide (hereinafter abbreviated as “BANI”) and mixing and stirring under vacuum.
BANI used in this step is an addition-type thermosetting imide monomer synthesized from allyl nadic anhydride and diamine and having allyl groups at both ends after completion of the dehydration ring-closing reaction. Since BANI is bulky and has a relatively strong allyl norbornene skeleton, it has a low melting temperature (melting point). In addition, since BANI has a lower curing temperature than conventional imide resins and the like, when used as a resin material for a fiber reinforced plastic (hereinafter abbreviated as “FRP”) molded body, the FRP molded body is cooled at a low temperature (about 300 ° C. or lower). Furthermore, since BANI has a minimum viscosity of about 20 cp and a viscosity range of 100 cp or less is relatively wide up to about 100 to 220 ° C., the moldability is also good. Moreover, the cured product of BANI is characterized by high heat resistance and excellent adhesion.

  BANI is preferably a solid at room temperature (25 ° C.) from the viewpoint of producing a short fiber-containing resin film having characteristics suitable for the method for producing the fiber-reinforced plastic molded body of the present embodiment. If the BANI is liquid at room temperature, the short fiber-containing resin film tends to be difficult to be formed.

BANI generally has the following chemical formula (1).

  In chemical formula (1), R represents the following diphenylmethane group (2), hexamethylene group (3) or xylylene group (4).

Among the BANIs represented by the above chemical formula, BANI in which R is a diphenylmethane group (2) or a xylylene group (4) is preferable, and BANI in which R is a diphenylmethane group (2) is more preferable.
Moreover, BANI represented by said chemical formula can be used individually or in combination of 2 or more types. However, when several types of BANI are used in combination, the tackiness (degree of viscosity) of the short fiber-containing resin film can be adjusted by the blending ratio, while the heat resistance may be lowered. Therefore, it is preferable to use a single component BANI.

  BANI having the structure as described above is commercially available from Maruzen Petrochemical Co., Ltd. under the trade names “BANI-M”, “BANI-H”, and “BANI-X”. Good.

  The short fibers used in this step are not particularly limited as long as they are formed from fibers having heat resistance, and various known short fibers used for FRP molded products can be used. Examples of short fibers include short fibers formed from inorganic fibers such as carbon fibers, glass fibers, and Kevlar fibers, and organic fibers such as aramid fibers. These can be used alone or in combination of two or more.

Here, in the present specification, the “short fiber” means a fiber bundle that is cut to a fiber length of generally 10 mm or less, preferably 5 mm or less.
It is preferable that the short fiber has a fiber length smaller than the opening width (cross width) of the reinforcing fiber fabric from the viewpoint of enhancing the integration of the short fiber-containing resin film and the reinforcing fiber fabric. That is, for example, when the opening width of the reinforcing fiber fabric is 3 mm, the fiber length of the short fibers is preferably less than 3 mm. When the short fiber has a fiber length larger than the opening width of the reinforcing fiber fabric, the short fiber is not introduced into the opening of the reinforcing fiber fabric and remains on the surface of the reinforcing fiber fabric, and the short fiber-containing resin film Integration with the reinforcing fiber fabric may not be sufficient. Here, in the present specification, “integration of a short fiber-containing resin film and a reinforced fiber fabric” means that the short fiber-containing resin film and the reinforcing material are reinforced by a laminate production process, a melting / impregnation process, and a curing process described below. It means to combine with a textile fabric. Further, the “opening width” of the reinforcing fiber fabric refers to the width of the opening existing in the reinforcing fiber fabric, for example, the width of the opening formed between the warp and the weft constituting the reinforcing fiber fabric. means.

In this step, the short fibers are blended into the heated and melted BANI. BANI can be melted by heating to the melting temperature. Here, the “melting temperature” of BANI in this specification means a temperature at which BANI changes from a solid to a liquid. The melting temperature of BANI may be appropriately set depending on the type of BANI used, but is generally less than 200 ° C., preferably 50 ° C. or more and 180 ° C. or less, more preferably 60 ° C. or more and 160 ° C. or less.
Moreover, the mixture ratio of the short fiber with respect to BANI is not particularly limited, but affects the flexibility of the produced short fiber-containing resin film. For example, when an FRP molded body having a complicated shape is produced, it is desirable to increase the flexibility of the short fiber-containing resin film, so the amount of BANI may be increased. However, if the amount of BANI is too large, the heat resistance of the FRP molded product may be lowered. Therefore, the proportion of short fibers in the total of BANI and short fibers (that is, in the short fiber resin film) is preferably 20% by mass or less, more preferably 15% by mass or less, and most preferably 10% by mass or less. .

After mixing the short fiber with molten BANI and mixing and stirring, vacuum defoaming treatment is performed by further mixing and stirring under vacuum. Specifically, the pressure may be reduced using a vacuum pump or the like, and mixing and stirring may be continued. Thereby, it is possible to obtain a defoamed mixture from which air bubbles mixed at the time of heating and melting of BANI and blending of short fibers are removed.
The stirring method is not particularly limited, but depending on the type of short fiber, aggregation or the like may occur, and bubbles may be easily mixed. Therefore, it is necessary to appropriately select a known stirring method according to the type of short fiber.
Moreover, the conditions (for example, pressure etc.) of a vacuum defoaming process are not specifically limited, What is necessary is just to set suitably according to the raw material to be used or the kind of installation.

(Production process of short fiber-containing resin film)
The short fiber-containing resin film is produced by forming a defoamed mixture into a film and cooling it.
Usually, when the BANI is cooled after being heated and melted, the shape cannot be maintained in many cases. However, by adding short fibers to the heat-melted BANI, the film can be formed into a film.
It does not specifically limit as a shaping | molding method to a film form, A well-known method can be used in the said technical field. For example, the defoamed mixture is poured into a mold that has been subjected to a mold release treatment, press-molded, and then cooled to form a film. The obtained short fiber-containing resin film is demolded and then used in the next step. The release treatment is not particularly limited, and a known release agent may be applied to the surface of the mold or a release film may be disposed. Moreover, you may shape | mold into a film form other than said method using a vacuum laminator and a doctor blade.

  The thickness of the produced short fiber-containing resin film is not particularly limited, and may be appropriately adjusted according to the number and size of reinforcing fiber fabrics used in the production process of the laminate. The thickness of the short fiber-containing resin film is generally from 10 μm to 10 mm, preferably from 50 μm to 5 mm, more preferably from 100 μm to 3 mm.

  In addition, when forming into a short fiber-containing resin film, the short fiber-containing resin film may be preformed into the shape of an FRP molded body from the viewpoint of preventing cracking of the short fiber-containing resin film in subsequent steps. For example, when a hemispherical FRP molded body is manufactured, it may be preformed into a hemispherical short fiber-containing resin film corresponding to the shape of the FRP molded body. By preforming in this way, there is no need to process (for example, cut out) the short fiber-containing resin film in accordance with the shape of the FRP molded body before the production process of the laminate, While being able to prevent a crack, the manufacturing efficiency of a FRP molded object also improves.

(Laminate manufacturing process)
The laminate is produced by laminating a short fiber-containing resin film and a reinforced fiber fabric.
The reinforcing fiber fabric used in this step is not particularly limited as long as it is formed from heat-resistant fibers, and known reinforcing fiber fabrics used for FRP molded products can be used. Examples of reinforcing fiber fabrics include reinforcing fiber fabrics formed from inorganic fibers such as carbon fibers, glass fibers, and Kevlar fibers, and organic fibers such as aramid fibers. These can be used alone or in combination of two or more.

  The reinforcing fiber woven fabric as described above is commercially available from Toray Industries, Inc. under the trade name “Torayca (registered trademark) cloth”, and these commercially available products may be used.

The magnitude | size etc. of a reinforced fiber fabric are not specifically limited, What is necessary is just to adjust suitably according to the magnitude | size of a FRP molded object.
The number of the short fiber-containing resin film and the reinforcing fiber fabric is not particularly limited, and the number corresponding to the thickness of the FRP molded body may be used. Therefore, the number of short fiber-containing resin films and reinforcing fiber fabrics may be two or more as well as one.
The order of lamination of the short fiber-containing resin film and the reinforcing fiber fabric is not particularly limited, but from the viewpoint of efficiently performing the impregnation treatment in the next step, it is preferable to alternately laminate the short fiber-containing resin film and the reinforcing fiber fabric. . For example, as shown in FIG. 2, the reinforcing fiber fabric 2, the short fiber-containing resin film 3, and the reinforcing fiber fabric 2 may be sequentially arranged and laminated in the mold 1.

  From the viewpoint of forming the laminate into a desired shape, the laminate is preferably produced using the mold 1 corresponding to the shape of the FRP molded body. By using the mold 1 corresponding to the shape of the FRP molded body, the subsequent steps can be performed efficiently. For example, when producing a hemispherical FRP molded body, as shown in FIG. 3, a hemispherical mold 1 is used, and a reinforcing fiber fabric 2, a short fiber-containing resin film 3, and a reinforcing fiber fabric 2 are sequentially disposed thereon. And can be laminated.

At the time of lamination, the end of the laminate may be fixed with a glass tape or the like from the viewpoint of preventing dislocation between the short fiber-containing resin film 3 and the reinforcing fiber fabric 2.
Further, by heating during lamination, the short fiber-containing resin film 3 may be softened to increase the viscosity, and the adhesion between the short fiber-containing resin film 3 and the reinforcing fiber fabric 2 may be improved. For example, after laminating the short fiber-containing resin film 3 on the reinforcing fiber fabric 2 and heating to the softening temperature of BANI used for the short fiber containing resin film 3, the reinforcing fiber fabric 2 is laminated on the short fiber containing resin film 3. By doing, the shift | offset | difference of arrangement | positioning between the short fiber containing resin film 3 and the reinforced fiber fabric 2 can be prevented.
Here, the “softening temperature” of BANI in this specification means a temperature at which BANI softens and begins to deform when heated. This softening temperature may be appropriately set according to the type of BANI used, and is generally 35 ° C. or higher and 100 ° C. or lower, preferably 40 ° C. or higher and 90 ° C. or lower, more preferably 40 ° C. or higher and 80 ° C. or lower.

(Melting / impregnation process)
The melting / impregnation step is performed by heating or depressurizing the laminated body to the melting temperature of BANI. Thereby, the reinforcing fiber fabric 2 can be impregnated while the BANI in the short fiber-containing resin film 3 is melted. When the heating temperature is lower than the melting temperature, BANI does not melt, and the reinforcing fiber fabric 2 cannot be impregnated with BANI in the short fiber-containing resin film 3. On the other hand, when the heating temperature is too high (for example, when the curing temperature is set), the BANI in the short fiber-containing resin film 3 is cured before the reinforcing fiber fabric 2 is sufficiently impregnated, and a homogeneous FRP molded body is formed. Can't get.

  The method for heating and pressurizing or depressurizing the laminate to the BANI melting temperature is not particularly limited, and a known method capable of simultaneously performing heating and pressurization or depressurization can be used. For example, when pressurizing, a hot press method can be used. When using the hot press method, as shown in FIGS. 2 and 3, a pressing die 4 is placed on the top of the laminate, and this is placed in the hot press, and then pressed. In the case of reducing the pressure, a vacuum forming method, an autoclave forming method, or the like capable of heating and forming under vacuum can be used. At this time, from the viewpoint of sufficiently melting the BANI in the short fiber-containing resin film 3, it is preferable to pressurize or depressurize after holding for a certain time at the BANI melting temperature. The holding temperature may be appropriately adjusted according to the type of material used, the size of the laminate, etc., but is generally 5 minutes to 1 hour, preferably 10 minutes to 30 minutes.

  The magnitude of the pressurization may be appropriately adjusted according to the type of material used, the size of the laminate, etc., but is generally 0.05 MPa to 50 MPa, preferably 0.1 MPa to 10 MPa. Similarly, the size of the reduced pressure may be appropriately adjusted according to the type of material used, the size of the laminate, and the like, but generally the degree of vacuum is -0.09 MPa or less.

(Curing process)
The curing step is performed by heating the laminate to the BANI curing temperature. Thereby, BANI in a laminated body can be hardened. When the heating temperature is lower than the curing temperature, BANI is not cured and an FRP molded product having desired mechanical properties cannot be obtained.
Here, the “curing temperature” of BANI in the present specification means a temperature at which a three-dimensional crosslinked structure is formed by the addition reaction of double bonds in the allyl group of BANI and the nobornene skeleton. This curing temperature may be appropriately set according to the type of BANI used, and is generally 200 ° C. or higher and 300 ° C. or lower, preferably 210 ° C. or higher and 280 ° C. or lower, more preferably 220 ° C. or higher and 270 ° C. or lower.

The method for heating the laminate to the BANI curing temperature is not particularly limited, and a known method can be used. For example, the heating temperature may be increased to the BANI curing temperature using the apparatus used in the melting / impregnation step. For example, the FRP molded body 5 can be obtained by increasing the heating temperature to the BANI curing temperature using the apparatus used in the melting / impregnation step as shown in FIGS.
The heating time may be appropriately adjusted according to the type of material used, the size of the laminate, etc., but is generally 1 to 24 hours, preferably 2 to 20 hours.

(Demolding process)
Demolding is performed by removing the FRP molded body 5 from the mold 1 after cooling the curing step. The cooling method is not particularly limited, and cooling may be performed using various media in addition to natural cooling.

  According to the method for producing the FRP molded body 5 described above, the short fiber-containing resin film 3 prepared from the defoamed mixture obtained by blending the short fibers into the heat-melted BANI and mixing and stirring under vacuum is used as the reinforcing fiber. Since it is laminated with the woven fabric 2 and heat-molded, it is possible to prevent the disorder of the arrangement of the fiber reinforcement caused by bubbles and volatile components, and to obtain a homogeneous FRP molded body 5 excellent in heat resistance and mechanical properties. be able to. In addition, since the amount of resin of the short fiber-containing resin film 3 can be easily adjusted during the production of the short fiber-containing resin film 3, the amount of resin impregnated into the reinforcing fiber fabric 2 can be easily controlled. The FRP molded object 5 which has the optimal content rate of the reinforced fiber fabric 2 can be obtained.

EXAMPLES Hereinafter, although an Example demonstrates the detail of this invention, this invention is not limited by these.
Example 1
10 g of BANI-M (manufactured by Maruzen Petrochemical Co., Ltd.) was placed in a metal container, and the metal container was placed in an oven and heated to 170 ° C. for 20 minutes to melt BANI-M. Next, 0.5 g of pitch-based carbon short fibers (fiber length: 200 μm) were blended with the melted BANI-M, and the mixture was stirred under vacuum to prepare a defoamed mixture.
Next, the defoamed mixture was poured into a 1 mm-thick metal frame that could be formed into a size of 10 cm × 10 cm, pressed into a film, and allowed to cool naturally. Thereafter, the metal frame was removed to obtain a short fiber-containing resin film.
Next, two carbon fiber woven fabrics (T300 cloth material, manufactured by Toray Industries, Inc.) were cut into a size of 9 cm × 9 cm, and each of the short fiber-containing resin films obtained above was cut out to obtain two carbon fiber woven fabrics. A laminate with one short fiber-containing resin film sandwiched therebetween was placed in a 9 cm × 9 cm mold.

Next, a pressing die was placed on the laminate, and this was placed on a hot press, and then heated to 170 ° C. at a temperature rising rate of 5 ° C./min and held for 10 minutes. Next, after pressurizing this laminated body on the conditions of uniaxial press and press pressure 0.3MPa, it heated to 250 degreeC with the temperature increase rate of 5 degree-C / min, and was hold | maintained for 12 hours. Thereafter, the FRP molded body was obtained by natural cooling and demolding.
As a result of observing the cross section of the obtained FRP molded product, conspicuous voids and disturbance of the reinforcing fiber fabric were not confirmed in each part of the matrix resin and the reinforcing fiber fabric.
Moreover, the result of having measured Tg of the FRP molded object with the thermal-analysis apparatus (TMA) is shown in FIG. As shown in FIG. 4, the Tg of the FRP molded body was 290 ° C., and it was confirmed that the heat resistance was excellent.

(Example 2)
A short fiber-containing resin film was prepared in the same manner as in Example 1, and a carbon fiber fabric (T300 cloth material, manufactured by Toray Industries, Inc.) was prepared. Next, two carbon fiber fabrics (T300 cloth material, manufactured by Toray Industries, Inc.) and one short fiber-containing resin film were cut out to a size of 150 mm × 150 mm.
Next, one carbon fiber fabric was placed in a hemispherical mold (diameter 200 mm) preheated at 80 ° C. for 30 minutes, and one short fiber-containing resin film was laminated thereon. After maintaining for 3 minutes in this state to soften the short fiber-containing resin film, one carbon fiber fabric was placed thereon. At this time, the displacement of the carbon fiber fabric could be prevented by the viscosity generated by the softening of the short fiber-containing resin film.

Next, a pressing die was placed on the laminate placed in the hemispherical mold, and this was placed in a hot press, and then heated to 170 ° C. at a heating rate of 5 ° C./min and held for 10 minutes. Next, after pressurizing this laminated body on the conditions of uniaxial press and press pressure 0.3MPa, it heated to 250 degreeC with the temperature increase rate of 5 degree-C / min, and was hold | maintained for 12 hours. Thereafter, the FRP molded body was obtained by natural cooling and demolding.
As a result of observing the cross section of the obtained FRP molded product, conspicuous voids and disturbance of the reinforcing fiber fabric were not confirmed in each part of the matrix resin and the reinforcing fiber fabric.
Moreover, as a result of measuring Tg with a thermal analyzer (TMA), Tg was 290 ° C., and it was confirmed that the heat resistance was excellent.

  As can be seen from the above results, according to the present invention, it is possible to provide a method for producing a homogeneous fiber-reinforced plastic molded article having excellent heat resistance and mechanical properties.

  1 type, 2 reinforced fiber fabric, 3 short fiber-containing resin film, 4 stamping mold, 5 FRP molded body.

Claims (6)

Blending short fibers with heat-melted bisallylnadiimide, mixing and stirring under vacuum to prepare a defoamed mixture; and
Forming the defoamed mixture into a film and cooling to produce a short fiber-containing resin film;
Laminating the short fiber-containing resin film and the reinforced fiber fabric, and producing a laminate,
Heating the laminate to the melting temperature of the bisallylnadiimide, pressurizing or depressurizing, and impregnating the reinforcing fiber fabric while melting the bisallylnadiimide in the short fiber-containing resin film;
Heating the laminated body to the curing temperature of the bisallylnadiimide, and curing the bisallylnadiimide in the laminated body.   The method for producing a fiber-reinforced plastic molded body according to claim 1, wherein the short fibers have a fiber length smaller than an opening width of the reinforcing fiber fabric.   The method for producing a fiber-reinforced plastic molded body according to claim 1 or 2, wherein a ratio of short fibers in the short fiber resin film is 20% by mass or less.   The said short fiber is at least 1 sort (s) selected from the group which consists of carbon fiber, glass fiber, and an aramid fiber, The manufacture of the fiber reinforced plastic molding as described in any one of Claims 1-3 characterized by the above-mentioned. Method.   In the process of producing the said short fiber containing resin film, the said short fiber containing resin film is preformed in the shape of the said fiber reinforced plastics molded object, It is characterized by the above-mentioned. A method for producing a fiber-reinforced plastic molding.   In the step of producing the laminate, the short fiber-containing resin film is laminated on the reinforcing fiber fabric, heated to the softening temperature of the bisallylnadiimide, and then the reinforcing fiber fabric is formed on the short fiber-containing resin film. It laminates and produces a laminated body, The manufacturing method of the fiber reinforced plastic molding as described in any one of Claims 1-5 characterized by the above-mentioned.

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