JP6990393B2 - Manufacturing method of fiber reinforced composite material - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act ・ 2016 Graduation Research Summary Collection Department of Mechanical Engineering, Faculty of Industrial Science and Technology, Nihon University (Publication date: February 14, 2017, Publication date: February 24, 2017) ・ Department of Mechanical Engineering, 2016 Graduation research presentation (Date: February 24, 2017)

The present invention relates to a method for producing a fiber -reinforced composite material.

Fiber reinforced plastics (FRP), which have excellent specific strength and rigidity, are used in a wide range of fields as metal substitutes for the purpose of weight reduction, including the automobile industry.
As a method for continuously producing a fiber reinforced plastic (FRP) material of a thermosetting resin, for example, a pultrusion method as disclosed in Patent Document 1 is known. Since an uncured thermosetting resin that is in a liquid state at room temperature and does not have a high viscosity is used, it can be easily impregnated into fibers and can be easily continuously molded.
On the other hand, as a method for continuously producing a fiber reinforced plastic (FRP) material of a thermoplastic resin, in Patent Document 2, a reinforced material made of carbon fiber or the like is impregnated with a polymerizable lactam mixed solution, and an excess matrix material is removed by a removing device. A method for drawing out a fiber-reinforced composite material, which is scooped up and then heated and polymerized by passing it through a heating device, is disclosed. Further, in Patent Document 3, when a fiber material is impregnated with a polymerizable lactam mixed liquid and polymerized to produce a fiber-reinforced composite material, a discharge unit and a discharge control unit are provided at the bottom of a tank containing the polymerizable lactam mixed liquid. A method for continuously producing a fiber-reinforced composite material of a thermoplastic resin, which has been devised to be provided, has been proposed.

Japanese Unexamined Patent Publication No. 2004-74427 Japanese Patent Publication No. 2005-513206 Special Table 2017-007266 Gazette

Although continuous pultrusion of thermosetting resin FRP material as disclosed in Patent Document 1 has been put into practical use, pultrusion of thermoplastic resin FRP material is difficult to control the polymerization rate, and continuous molding is possible. difficult.
In the pultrusion method of the fiber-reinforced composite material disclosed in Patent Document 2, impregnation with the fiber tends to be insufficient, the resin polymerized by the heating device becomes highly viscous and easily clogged, and stable continuous molding is difficult. In Patent Document 3, since the mechanism discharges excess matrix material, the matrix material is wasted. Further, in Patent Document 3, the polymerization heating part and the molding part are independent, and since the surface of the fiber-reinforced composite material comes into direct contact with the polymerization heating part, friction is large, a large pulling force is required, and the fiber-reinforced composite is required. The surface of the material was rough, resulting in unevenness.

The present invention has been made in view of the above circumstances, and provides an apparatus for producing a fiber-reinforced composite material capable of stable continuous production and a method for producing a fiber-reinforced composite material.

The inventors can prevent the reaction solution from coming into contact with air during polymerization by heating and polymerizing the polymerizable lactam mixed solution impregnated in the fiber sheet material while being sandwiched between a pair of protective sheets. Since the polymerizable lactam mixture does not come into direct contact with the hot mold, the pulling force can be reduced, the surface of the fiber-reinforced composite material can be cleaned, and nylon, which is a thermoplastic resin, is used as a mother. It has been found that the fiber-reinforced composite material used as a material can be continuously produced.
That is, the present invention provides the following means for solving the above problems.

(1) The fiber-reinforced composite material manufacturing apparatus according to the first aspect is a mixer in which a thermoplastic resin monomer and a polymerization catalyst are mixed to form a thermoplastic resin monomer mixed solution, and the thermoplastic resin monomer mixed solution is mixed with fibers. A laminating device that continuously impregnates the sheet material and sandwiches it between the first protective sheet and the second protective sheet, and a thermoplastic resin monomer mixed solution that is sandwiched between the first protective sheet and the second protective sheet and impregnated into the fiber sheet material. A heat polymerization machine for forming a sheet-shaped fiber-reinforced composite material using a thermoplastic resin as a base material by heat-polymerizing the above, and a drawing device for continuously pulling out the fiber-reinforced composite material from the heat-polymerizing machine. ..

(2) In the fiber-reinforced composite material manufacturing apparatus according to the above embodiment, the mixer and the laminating apparatus may be covered with a housing so that they can be operated under an inert gas atmosphere or in a vacuum.
(3) In the fiber-reinforced composite material manufacturing apparatus according to the above aspect, the fiber sheet material supply device for supplying the fiber sheet material to the laminating device is provided, and the fiber sheet material supply device preheats the fiber sheet material. It may be provided with a heating device.

(4) In the apparatus for producing a fiber-reinforced composite material according to the above aspect, the thermoplastic resin monomer is a lactam monomer, and the fiber-reinforced composite material is a sheet-shaped fiber-reinforced composite material using polyamide as a base material. May be good.
(5) In the apparatus for producing a fiber-reinforced composite material according to the above aspect, the mixer mixes a mixed solution A of a lactam monomer and an activator and a mixed solution B of a lactam monomer and a polymerization catalyst. May be good.

(6) In the method for producing a fiber-reinforced composite material according to the second aspect, a mixed solution A of a lactam monomer and an activator and a mixed solution B of a lactam monomer and a polymerization catalyst are mixed, and the mixed solution A and the above -mentioned mixed solution A are mixed. The fiber sheet material was continuously impregnated with the lactam monomer mixed solution obtained by mixing the mixed solution B , sandwiched between the first protective sheet and the second protective sheet, and sandwiched between the first protective sheet and the second protective sheet. The lactam monomer mixed solution impregnated in the fiber sheet material is heat-polymerized to form a sheet-shaped fiber-reinforced composite material using polyamide as a base material, and the fiber-reinforced composite material is continuously drawn out.

(7) In the method for producing a fiber-reinforced composite material according to the above embodiment, the fiber sheet material is continuously impregnated with the lactam monomer mixture in an inert gas atmosphere or in a vacuum, and the fiber sheet material is continuously impregnated with the first protective sheet and the second protection. It may be sandwiched between sheets.
(8) In the method for producing a fiber-reinforced composite material according to the above embodiment, the fiber sheet material may be preheated and then the fiber sheet material may be continuously impregnated with the lactam monomer mixed solution.

INDUSTRIAL APPLICABILITY According to the present invention, stable continuous production of a fiber-reinforced composite material of a thermoplastic resin becomes possible.

It is a schematic diagram which shows the outline of the manufacturing apparatus of the fiber reinforced composite material of this invention.

Hereinafter, the apparatus for producing the fiber-reinforced composite material and the method for producing the fiber-reinforced composite material according to the present invention will be described in detail with reference to the drawings.
It should be noted that the drawings used in the following description may be shown differently from the actual fiber-reinforced composite material manufacturing apparatus for convenience in order to make the features easy to understand. Further, the materials, conditions, etc. exemplified in the following description are examples, and the present invention is not necessarily limited to them, and the present invention can be appropriately modified without changing the gist thereof. ..

As one embodiment of the present invention, the fiber-reinforced composite material manufacturing apparatus 1 shown in FIG. 1 includes a mixer 10 and a mixer 10 in which a thermoplastic resin monomer and a polymerization catalyst are mixed to form a thermoplastic resin monomer mixed solution. The laminating device 20 in which the obtained thermoplastic resin monomer mixed solution is continuously impregnated into the fiber sheet material 30 and sandwiched between the first protective sheet 21 and the second protective sheet 22, and the first protective sheet 21 and the second protective sheet 22. The thermoplastic resin monomer mixed solution sandwiched between the fibers and the fiber sheet material 30 is heat-polymerized to form a sheet-shaped fiber-reinforced composite material 32 using the thermoplastic resin as a base material, and a heating polymer 40. A drawing device 50 for continuously pulling out the fiber-reinforced composite material 32 from the polymerization machine 40 is provided.

Further, the method for producing a fiber-reinforced composite material according to the present invention can be realized by the fiber-reinforced composite material manufacturing apparatus 1 shown in FIG. 1, and is thermoplastic obtained by mixing a thermoplastic resin monomer and a polymerization catalyst. The fiber sheet material 30 is continuously impregnated with the resin monomer mixed solution, sandwiched between the first protective sheet 21 and the second protective sheet 22, and sandwiched between the first protective sheet 21 and the second protective sheet 22. The thermoplastic resin monomer mixed solution impregnated with the above is heat-polymerized to form a sheet-shaped fiber-reinforced composite material 32 using the thermoplastic resin as a base material, and the fiber-reinforced composite material 32 is continuously drawn out.

The heat polymerization machine 40 is a sheet sandwiched between a first protective sheet 21 and a second protective sheet 22 and heat-polymerized with a thermoplastic resin monomer mixed solution impregnated in the fiber sheet material 30 to use a thermoplastic resin as a base material. It suffices as long as it forms a fiber-reinforced composite material 32 in the shape of a fiber, and the heat polymerization machine 40 has a plate-shaped upper mold and a plate-shaped lower mold, and is a thermoplastic resin impregnated in the fiber sheet material 30. The first protective sheet 21 and the second protective sheet 22 sandwiching the monomer mixed solution may be configured to be pulled out by the drawing device 50 so as to slide between the upper mold and the lower mold.

Like the fiber-reinforced composite material manufacturing device 1 shown in FIG. 1, the drawing device 50 continuously connects the fiber-reinforced composite material 32 sandwiched between the first protective sheet 21 and the second protective sheet 22 from the heat polymerizer 40. The extraction device 50 may continuously withdraw the first protective sheet 21 and the fiber-reinforced composite material 32 from the heat polymerizer 40, and the second protective sheet 22 is separately recovered. The extraction device 50 continuously extracts only the fiber-reinforced composite material 32 from the heat polymerizer 40, and the first protective sheet 21 and the second protective sheet 22 are recovered. You may.

The laminating device 20 continuously impregnates the fiber sheet material 30 with the thermoplastic resin monomer mixture obtained in the mixer 10 and sandwiches it between the first protective sheet 21 and the second protective sheet 22. The plate thickness of the sheet-shaped fiber-reinforced composite material using the thermoplastic resin as the base material can be adjusted by the rollers of the laminating device 20. Since it is rolled by the rollers of the laminating device 20, it is possible to mold while removing excess air, the surface of the sheet-like fiber-reinforced composite material becomes smooth and clean, and the air inside is quickly removed, so that it is minute. Can reduce the number of cavities.

In the fiber-reinforced composite material manufacturing apparatus 1 and the fiber-reinforced composite material manufacturing method, the thermoplastic resin monomer mixed solution impregnated in the fiber sheet material 30 while being sandwiched between the first protective sheet 21 and the second protective sheet 22. Since the thermoplastic resin monomer mixed solution does not come into direct contact with the heat polymerization machine 40, the pulling force can be reduced, and the sheet-shaped fiber-reinforced composite using the thermoplastic resin as the base material can be reduced. The surface of the material can be made beautiful, and a fiber-reinforced composite material using a thermoplastic resin as a base material can be continuously produced.

In the fiber-reinforced composite material manufacturing apparatus 1 and the fiber-reinforced composite material manufacturing method, the mixer 10 and the laminating device 20 may be covered with a housing 24 so that they can be operated under an inert gas atmosphere or in a vacuum. As a result, the fiber sheet material 30 can be continuously impregnated with the thermoplastic resin monomer mixed solution under an inert gas atmosphere or in a vacuum, and sandwiched between the first protective sheet 21 and the second protective sheet 22. Further, by connecting to the heat polymerization machine as it is, it is possible to prevent the thermoplastic resin monomer mixture from coming into contact with air, and it is possible to remove the influence of moisture in the air during polymerization.

It is more preferable that the mixer 10 and the laminating device 20 are covered with a housing 24 so that the mixer 10 and the laminating device 20 can be operated in an inert gas atmosphere. At this time, the housing 24 sends dry air or dry nitrogen gas. A gas suction port and a gas discharge port may be provided, and a desiccant / dehumidifying agent such as silica gel or calcium chloride may be provided in the housing. It is desirable to supply dry air or dry nitrogen gas into the housing 24 to keep the relative humidity at 20% or less.

The fiber-reinforced composite material manufacturing device 1 includes a fiber sheet material supply device 34 that supplies the fiber sheet material 30 to the laminating device 20. Since moisture in the air causes polymerization inhibition, it is preferable to sufficiently dry the fiber sheet material 30 before polymerization, and therefore, the fiber sheet material supply device 34 uses the fiber sheet material 30 to dry the fiber sheet material 30 sufficiently. A heating device 36 for preheating may be provided. As the heating device 36, a general plate heater or a far-infrared heater can be used. By using the far-infrared heater, the inside of the fiber sheet material 30 can be sufficiently heated and dried. Immediately after heating the fiber sheet material 30 with the heating device 36, the fiber sheet material 30 is continuously impregnated with the thermoplastic resin monomer mixed solution to absorb the moisture absorbed by the fiber sheet material 30 immediately before molding. By evaporating, the influence of moisture in the air at the time of polymerization can be more preferably removed, and the polymerization reaction temperature of the thermoplastic resin monomer mixed solution can be secured.

The fiber sheet material supply device 34 also includes a so-called general roving rack or a support rod capable of holding and positioning the woven material. It is also possible to install a tension bar or the like in order to ensure the linearity of the fiber sheet material 30. When carbon fiber is used, it is preferable to perform cleaning or neutralization treatment for removing the carboxylic acid contained in the sizing agent before molding.

The thermoplastic resin monomer may be, for example, a lactam monomer or an epoxy monomer. The thermoplastic resin monomer may be a lactam monomer, and the fiber-reinforced composite material may be a sheet-shaped fiber-reinforced composite material using polyamide as a base material.

Examples of the lactam monomer include γ-butyrolactam (melting point: 25 ° C.), δ-valerolactam (melting point: -13 ° C.), ε-caprolactam (melting point: 69 ° C.) and the like.

Activators include hexamethylene diisocyanate, isocyanates and blocked triisocyanates; isophthaloylbiscaprolactam, tetraphthaloylbis-caprolactam; esters such as dimethylphthalate-polyethylene glycol; polyols or polydiene pres combined with bisylated products. Polymers; examples include carbonylbiscaprolactam obtained by reacting phosgene with caprolactam.
Examples of the polymerization catalyst include alkali metal adducts of caprolactam, for example, sodium caprolactate, potassium caprolactamate and lithium caproractumate; aluminum or magnesium caprolactam with magnesium bromide; alkoxide and the like.

Here, the mixer 10 may be a mixer that mixes the mixed solution A of the lactam monomer and the activator and the mixed solution B of the lactam monomer and the polymerization catalyst. The mixer 10 may be agitated and mixed by a stirring blade, or may be agitated and mixed by a mixing head arranged in a static mixer.

The fiber sheet material 30 may be a fiber sheet material of glass, carbon, metal, phosphate, ceramic or polymer, and a glue that promotes the binding of the thermoplastic resin monomer mixed solution component to the fiber sheet material. Alternatively, it may contain a paint. Further, as the form of the fiber sheet material, continuous fibers such as filaments, fibers, rovings of strands or woven fabrics, knitted woven mats, non-woven mats, and other forms can be used.

The mixer 10 may directly mix the lactam monomer, the activator and the polymerization catalyst, but mixes the mixed solution A of the lactam monomer and the activator and the mixed solution B of the lactam monomer and the polymerization catalyst. It may be a thing.

When the lactam monomer is solid at room temperature, it is heated and melted to a temperature equal to or higher than the melting point and mixed. When the lactam monomer, the activator and the polymerization catalyst are melt-mixed, the polymerization starts, and when the mixture is excessively polymerized in the mixer 10 and the viscosity becomes high, the liquid is sent to the laminating apparatus 20 and then transferred to the fiber sheet material 30. It becomes difficult to impregnate evenly and evenly. Thermoplastic resin monomer mixed solution by appropriately controlling conditions such as the active agent concentration of the mixed solution A of the lactam monomer and the activator, the polymerization catalyst concentration of the mixed solution B of the lactam monomer and the polymerization catalyst, and the temperature of the mixer 10. Can be uniformly and evenly impregnated in the fiber sheet material 30.

The active agent concentration of the suitable mixed solution A of the lactam monomer and the active agent is 0.1 to 50% by mass, more preferably 0.5 to 30% by mass.
The polymerization catalyst concentration of the suitable mixture B of the lactam monomer and the polymerization catalyst is 0.1 to 50% by mass, more preferably 0.5 to 30% by mass.
The temperature of a suitable mixer 10 is 70 to 120 ° C.

The thermoplastic resin monomer mixture obtained by the mixer 10 is sent into the laminating device 20 by a liquid feeding pump (not shown). Then, in the laminating device 20, first, the fiber sheet material 30 is placed on the first protective sheet 21, and the thermoplastic resin monomer mixed solution is evenly distributed on the fiber sheet material 30 placed on the first protective sheet 21. After being impregnated and then the second protective sheet 22 is laminated on the second protective sheet 22, the fiber is transferred to the heat polymerization machine 40 in a state of being sandwiched between the lower first protective sheet 21 and the upper second protective sheet 22. The thermoplastic resin monomer mixed solution impregnated in the sheet material 30 starts polymerization.

As the first protective sheet 21 and the second protective sheet 22, a release paper, a plastic film, or the like can be used independently, and as the plastic film, a release film (PET film), a heat-resistant film (PTFE film, etc.) can be used. Polyimide film) and the like.

The fiber-reinforced composite material manufacturing apparatus 1 and the fiber-reinforced composite material manufacturing method enable stable and continuous production of a sheet-shaped fiber-reinforced composite material using a thermoplastic resin as a base material. The sheet-shaped fiber-reinforced composite material whose base material is a thermoplastic resin, which is continuously molded by the fiber-reinforced composite material manufacturing apparatus 1 and the fiber-reinforced composite material manufacturing method, is a fiber whose base material is a thermosetting resin. Compared to reinforced composite materials, it shortens the time for secondary molding, can be expected to have high productivity, and is used as an intermediate material for various metal substitutes for the purpose of weight reduction, including automobile structural members that require recyclability. It can be applied to members.

Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the examples shown below.

[Example 1]
Using the fiber-reinforced composite material manufacturing apparatus 1 shown in FIG. 1, the fiber-reinforced polyamide composite material was continuously drawn and manufactured.

Of the fiber-reinforced composite material manufacturing apparatus 1, the mixer 10 and the laminating apparatus 20 are covered with a housing 24 made of a transparent acrylic box, and are dehumidified in a dry nitrogen gas atmosphere.

In a mixing tank 11 (not shown), heated and melted ε-caprolactam and the activator hexamethylene diisocyanate are mixed to prepare a mixed solution A having an active agent concentration of 2% by mass, melted and stored at 110 ° C., and mixed (not shown). In the tank 12, the heated and melted ε-caprolactam monomer and the polymerization catalyst ε-caprolactam / sodium salt were mixed to prepare a mixed solution B having a polymerization catalyst concentration of 16% by mass, which was melted and stored at 110 ° C. The temperatures of the mixing tank 11, the mixing tank 12, and the supply line were maintained at 110 ° C. to keep the ε-caprolactam monomer in a molten state.

Next, the two types of melted mixed liquid A and mixed liquid B are sent to a static mixer, which is a mixer 10, at 1 to 5 g / min, respectively, by a liquid feeding pump, and these are stirred and mixed to heat. A plastic resin monomer mixture is prepared and poured into the laminating apparatus 20. Here, the temperature of the mixer 10 is equal to or higher than the melting point, and the temperature of the laminating apparatus 20 is also equal to or higher than the melting point. , And the control of the flow rate of the liquid feed is important.

As the fiber sheet material 30, plain weave glass cloth WF300 10N manufactured by Nitto Spinning Co., Ltd. (grain mass: 272 g / m ² , width: 100 mm, warp density: 106 threads / 100 mm, weft density: 22.5 threads / 25 mm, thickness : 0.25 mm) was prepared in 2 rolls, and 2 layers of glass cloth were used.

In order to prevent the polymerization of water from being inhibited, the fiber sheet material 30 was dried by using a far-infrared heater (Sakaguchi Electric Heat Co., Ltd., PH50) as a heating device 36 at 80 ° C. before the polymerization.

As the first protective sheet 21 and the first protective sheet 22, PET films (width 150 mm, thickness 0.05 mm) are used, respectively, and first, in the roll holding portion for the lower protective sheet of the laminating device 20, the heating device 36 The fiber sheet material 30 dried and preheated in the above layer was laminated on the first protective sheet 21, and the fiber sheet material 30 was impregnated with the thermoplastic resin monomer mixed solution mixed and stirred by the mixer 10. rice field.

Further, in the roll holding portion for the upper protective sheet of the laminating device 20, the second protective sheet 22 is stacked, rolled by the rollers of the laminating device 20, sandwiched between the first protective sheet 21 and the second protective sheet 22, and the thermoplastic resin. The fiber sheet material 30 impregnated with the monomer mixed solution is guided to the heat polymerization machine 40. In the laminating device 20, the upper protective sheet roll holding portion is installed so as to be offset 200 mm rearward from the lower protective sheet roll holding portion.

The thermoplastic resin monomer mixed solution consisting of ε-caprolactam monomer, polymerization catalyst ε-caprolactam sodium salt and activator hexamethylene diisocyanate is heated to an environmental temperature of 130 ° C. or higher in a heating polymerizer 40 to cause polymerization. , Nylon 6. In the heat polymerization machine 40, the heat required for the polymerization of the thermoplastic resin monomer mixture is heated, and the shape is adjusted so as to have a uniform plate thickness as a sheet-shaped fiber-reinforced composite material. The heat polymerization machine 40 has a plate-shaped upper mold and a plate-shaped lower mold, and the lower mold has a length of 1300 mm and a width of 150 mm according to the arrangement of the first protective sheet 21 and the first protective sheet 22. The upper mold has a length of 1000 mm, a width of 150 mm, and a thickness of 0.6 mm. Regarding the mold temperature of the lower mold and the upper mold, the temperature was heated so that the internal temperature of the mold was 150 ° C ± 5 ° C.

As the drawing device 50, a caterpillar type picking machine (Igarashi Machinery Manufacturing Co., Ltd., SD-150) was used.

The first protective sheet 21, the fiber sheet material 30, and the second protective sheet 22 are fixed in advance to the upper and lower crawlers of the extraction device 50, and nylon 6 is used as a base material as a thermoplastic resin molded at a constant speed during molding. The sheet-shaped fiber-reinforced composite material 32 is taken over. The time for passing through the 1000 mm mold was calculated so as to secure the polymerization time of 5 minutes, and the take-up speed was set to 150 mm / min. The fiber volume content was 36.4%.

From this example, a sheet-shaped fiber-reinforced composite material 32 having a plate thickness of 0.67 mm and a uniform plate thickness, using nylon 6 as a base material and plain weave glass cloth as a fiber reinforcing material was obtained. The second protective sheet 22 was peeled off, and the surface roughness (Ra) of the fiber-reinforced composite material 32 was measured with a laser microscope (VK-250X manufactured by KEYENCE CORPORATION) and found to be 4.9 μm.

[Comparative Example 1]
According to Example 1 of Patent Document 3 (Japanese Patent Laid-Open No. 2017-007266), the surface roughness (Ra) of the polyamide composite material fiber-reinforced with the fiber material made of glass roving is measured with a laser microscope (VK manufactured by KEYENCE CORPORATION). When measured by −250X), it was 24.4 μm.

By the method for producing a fiber-reinforced composite material of the present invention, the surface of the fiber-reinforced composite material could be made beautiful. In addition, since it is continuously molded, it has high productivity, it is possible to modify the base resin, and it is highly versatile as a product. It was shown that the molding material can be formed by continuous forming.

1 Fiber-reinforced composite material manufacturing equipment 10 Mixer 20 Laminating equipment 21 First protective sheet 22 Second protective sheet 24 Housing 30 Fiber sheet material 32 Sheet-shaped fiber-reinforced composite material 34 fiber sheet using thermoplastic resin as a base material Material supply device 36 Heating device 40 Heating polymerizer 50 Extraction device

Claims (3)

The mixed solution A of the lactam monomer and the activator and the mixed solution B of the lactam monomer and the polymerization catalyst are mixed.
The fiber sheet material was continuously impregnated with the lactam monomer mixed solution obtained by mixing the mixed solution A and the mixed solution B , and sandwiched between the first protective sheet and the second protective sheet.
A sheet-shaped fiber-reinforced composite material using polyamide as a base material is formed by heat-polymerizing a lactam monomer mixed solution sandwiched between a first protective sheet and a second protective sheet and impregnated with a fiber sheet material.
A method for producing a fiber-reinforced composite material by continuously drawing out the fiber-reinforced composite material. The production of the fiber-reinforced composite material according to claim 1 , wherein the fiber sheet material is continuously impregnated with the lactam monomer mixture in an inert gas atmosphere or in a vacuum and sandwiched between the first protective sheet and the second protective sheet. Method. The method for producing a fiber-reinforced composite material according to claim 1 or 2 , wherein the fiber sheet material is preheated and then the fiber sheet material is continuously impregnated with the lactam monomer mixed solution.

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