JP2013208791A - Method of producing composite molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of producing a composite molded product capable of preparing a sandwich molded product having a layer of a fiber-reinforced material and a layer made of only resin by performing molding once.SOLUTION: A method of producing a composite molded product 4 including at least one layer of a fiber-reinforced composite material 5 and at least one layer 6 made of only resin includes a process of laminating reinforced fiber, a thermoplastic resin film or sheet 1 and a layer 3 suppressing passage of the reinforced fiber, melting resin to impregnate the resin with the reinforced fiber by hot press and solidifying the resin by cold press.

Description

  The present invention relates to a method for producing a fiber-reinforced plastic molded product that is required for light weight, high strength, and high rigidity, for example, used as a part of a personal computer, OA device, mobile phone or the like, a casing part, or an automobile part.

  Composite materials in which resin is reinforced with carbon fiber, glass fiber, etc. are used in various fields such as electrical / electronic equipment applications, civil engineering / architecture applications, automobile applications, aircraft applications due to their high specific rigidity and specific strength.

In particular, a sandwich structure may be employed for the purpose of reducing the weight.
In the case of producing a molded article having a sandwich structure, a method is known in which a core material and a skin material are separately produced as described in Patent Document 1 and are produced with an adhesive or the like. However, this method requires a step of separately preparing and bonding the core material and the skin material, which is not preferable from an economical viewpoint.

  In addition, when the matrix resin is made of a thermoplastic resin as in Patent Document 2, there is a method in which the core material and the skin material are simultaneously molded. However, if either one is used as a non-reinforcing material, the reinforcing fiber diffuses into the resin. Seems to be difficult.

Japanese Patent Application No. 2006-535768 JP 2012-890 A

  The present invention provides a method for producing a composite molded product that can produce a sandwich molded product having a fiber reinforcing material layer and a resin-only layer by a single molding.

The present invention for solving the above problems employs the following configuration. That is,
(1) By laminating a reinforcing fiber base, a thermoplastic resin sheet, and a suppression layer that suppresses the passage of reinforcing fibers, melting the thermoplastic resin sheet with a hot press, impregnating the reinforcing fibers, and solidifying with a cold press A method for producing a composite molded article, wherein at least one layer is a fiber-reinforced composite material layer and further has at least one layer made of resin alone.
(2) The method for producing a composite molded article according to (1), wherein the suppression layer is a nonwoven fabric.
(3) The method for producing a composite molded article according to (2), wherein the nonwoven fabric is papermaking made of glass fiber or organic fiber.
(4) The method of producing a composite molded article according to the basis weight of the paper is 20~100g / ^{m 2} (3).
(5) The manufacturing method of the composite molded article in any one of (1)-(4) in which the said fiber reinforced composite material layer has the following components (a) and a component (b).

Component (a): Reinforcing fiber: 25-80% by mass
Component (b): Polyamide resin: 20 to 75% by mass
(6) The method for producing a composite molded article according to (5), wherein the reinforcing fiber of the component (a) has a fiber length of 1 to 50 mm.
(7) The method for producing a composite molded article according to (5) or (6), wherein the reinforcing fibers are carbon fibers.
(8) The method for producing a composite molded article according to any one of (1) to (7), wherein the thermoplastic resin sheet is made of a polyamide resin.
(9) The method for producing a composite molded article according to any one of (1) to (8), wherein the hot press temperature is in the range of the melting point to the melting point + 80 ° C. of the component (b).
(10) The method for producing a composite molded article according to (9), wherein the cold press temperature is equal to or lower than a solidification temperature of the thermoplastic resin of the component (b).
(11) The method for producing a composite molded article according to any one of (1) to (10), wherein the pressure applied to the projected areas of the hot press and cold press is 2 MPa to 10 MPa.
(12) A composite obtained by the method for producing a composite molded article according to any one of (1) to (11), which is a part / member used for automobiles, electrical / electronic devices, home appliances, or aircraft applications Molding.
It is.

  By using a sandwich material in which the resin-only layer is the center and the surface layer is a reinforced fiber composite material, weight reduction and cost reduction can be achieved while suppressing a decrease in rigidity as compared with a solid reinforced fiber composite material. On the other hand, when the resin layer is placed on the surface layer, a product with a better appearance can be obtained as compared with the solid reinforced fiber composite material.

In the present invention, (a) a schematic diagram of a base material laminated structure before molding, (b) a schematic diagram of a cross section of a product after molding.

  Hereinafter, the manufacturing method of the composite molded product of this invention is demonstrated using drawing.

  Fig.1 (a) is a block diagram before shaping | molding in the manufacturing method of this composite molded product. The thermoplastic resin sheet 1, the reinforcing fiber base 2, and the suppression layer 3 that suppresses the passage of the reinforcing fibers are sequentially laminated. In that case, it is the characteristic of this invention to laminate | stack the suppression layer 3 before and behind the layer which ensures the layer 6 only of resin. By heating and pressurizing the laminates in this way with a hot press, the thermoplastic resin sheet 1 is melted, the molten thermoplastic resin 2 is impregnated with the molten thermoplastic resin, solidified with a cooling press, and taken out. A composite molded product is obtained.

  FIG. 1B is a cross-sectional view of the manufactured composite molded product 4. As the composite molded product 4, a fiber reinforced composite material layer 5, a suppression layer 3 that suppresses the passage of fibers, and a resin-only layer 6 (heat Residual portion of the plastic resin sheet 1) is formed.

  The composite molded product 4 obtained by the present invention has a predetermined fiber reinforced composite material on the surface layer of the composite molded product 4 by uniformly impregnating the reinforced fiber base material 2 with a molten thermoplastic resin during hot pressing. Layer 5 is formed. The fiber reinforced composite material layer 5 plays a role of exhibiting the rigidity and strength of the entire composite molded product 4 and also exhibits an appearance design. On the other hand, the suppression layer 3 is disposed so that fibers flowing due to falling off, peeling, or the like from the reinforcing fiber base 2 are not mixed into the internal thermoplastic resin sheet 1 (the layer that remains as the resin-only layer 6). . By providing the suppression layer 3, the fiber reinforced composite material layer 5 disposed on the surface layer includes the predetermined reinforcing fiber base material 2, and the amount of reinforcing fibers due to the flow decreases, and the predetermined strength and rigidity are reduced. Will not stop working. Further, since the suppression layer 3 itself allows permeation of the molten thermoplastic resin, the fiber reinforced composite material layer 5 and the suppression layer 3, or the suppression layer 3 and the resin-only layer 6 (the remaining portion of the thermoplastic resin sheet 1). )) Is firmly joined by a molten thermoplastic resin. Furthermore, by providing the suppression layer 3 and the resin-only layer 6, it is possible to reduce the weight and cost of the composite molded product 4 as a whole.

  Hereinafter, a specific method for manufacturing the composite molded product 4 will be described.

  As described above, the composite molded product 4 is formed by pressing the thermoplastic resin sheet 1, the reinforcing fiber base 2, and the suppression layer 3 in this order, and then molding the composite molded product 4 by press working. The press device (not shown) used for molding is not particularly limited as long as the mold used for the press can be temperature-controlled. There is no restriction | limiting in particular about the material of a metal mold | die, What is necessary is just what can endure press pressure and temperature. Moreover, there is no restriction | limiting in particular also about a temperature control medium and a temperature control line, What is necessary is just what can be temperature-controlled to desired temperature.

  The hot press temperature is preferably from the melting point to the melting point + 80 ° C. of the thermoplastic resin used for the thermoplastic resin sheet. When lower than the melting point, the molten thermoplastic resin is not impregnated into the reinforcing fiber base. On the other hand, when the melting point is higher than + 80 ° C., the thermoplastic resin is decomposed and physical properties are deteriorated and design properties are lowered.

  The temperature of the cold press is preferably less than the solidification temperature of the thermoplastic resin used for the thermoplastic resin sheet 1. If the temperature is higher than the solidification temperature, the composite molded product 4 cannot be taken out. Although the lower limit of the solidification temperature is not particularly limited, if the time required for temperature adjustment can be reduced when hot pressing and cold pressing are performed in the same mold, manufacturing time and manufacturing cost can be reduced. Therefore, it is preferable to provide a mechanism capable of adjusting the temperature in the range of the solidification temperature to the solidification temperature −30 ° C. When cold pressing is performed with another mold, temperature control is not necessary if it can be used at room temperature, and manufacturing costs can be reduced by shortening the waiting time for temperature adjustment and reducing energy consumption.

  The pressing pressure is preferably 2 MPa or more. If it is less than 2 MPa, the thermoplastic fiber base 2 is not sufficiently impregnated with the thermoplastic resin. In addition, when the press pressure is too high, the pressurization capacity required of the press machine is increased, which is not preferable from the viewpoint of economy, and it is possible to impregnate the reinforced fiber base material 2 with the thermoplastic resin and considering the economy 2 MPa to 10 MPa is more preferable.

  The reinforcing fiber substrate 2 is not particularly limited as long as it is a fiber that can reinforce the matrix resin. For example, 1) a mat-like strand reinforcing fiber in which a needle is pierced into a plurality of strand reinforcing fibers and the fibers are entangled with each other, and 2) a suspension obtained by dispersing and mixing a reinforcing fiber and a powdered, fiber-shaped thermoplastic resin in water. Molding material obtained by heating and pressurizing a nonwoven material obtained by making a paper from a suspension, 3) Powder shape and fiber shape of a nonwoven material obtained by making a paper from a suspension in which only reinforcing fibers are dispersed in water Examples thereof include a nonwoven fabric material of reinforcing fibers obtained by heating and pressurizing a thermoplastic resin having a film shape or a nonwoven fabric shape, and making paper. Among these, it is preferable to use a nonwoven fabric material of reinforcing fibers from the viewpoint of being easily impregnated with a molten thermoplastic resin and easily following complicated forms due to the dispersibility of the reinforcing fibers in the nonwoven fabric material.

  Examples of the reinforcing fibers used for the reinforcing fiber base 2 include metal fibers such as aluminum fibers, brass fibers, and stainless fibers, polyacrylonitrile-based, rayon-based, lignin-based, pitch-based carbon fibers, graphite fibers, glass, and the like. Inorganic fibers such as fibers, silicon carbide fibers, silicon nitride fibers, and organic fibers such as aramid fibers, polyparaphenylene benzobisoxazole (PBO) fibers, polyphenylene sulfide fibers, polyester fibers, acrylic fibers, nylon fibers, polyethylene fibers Etc. can be used. These reinforcing fibers may be used alone or in combination of two or more. Among these, carbon fibers are preferable from the viewpoint of the balance of specific strength, specific rigidity, and lightness, and at least polyacrylonitrile-based carbon fibers are more preferably included from the viewpoint of excellent specific strength and specific elastic modulus.

  The reinforcing fiber base 2 may include a reinforcing fiber bundle in which single yarns of a plurality of reinforcing fibers are combined. In this case, the number of single yarns of the reinforcing fiber bundle is not particularly limited, and can be used within the range of 100 to 350,000, and particularly within the range of 1,000 to 250,000. preferable. Further, from the viewpoint of productivity of reinforcing fibers, those having a large number of single yarns are preferable, and it is preferable to use them within a range of 20,000 to 100,000. When reinforcing fibers are included as reinforcing fiber bundles, a composition of urethane resin, polyamide resin, epoxy resin, acrylic resin, etc., is used as a single yarn to give the reinforcing fiber bundle a bundling property and to improve handling. It may be appropriately given to the surface. Furthermore, in order to make dispersion | distribution of a reinforced fiber favorable in a fiber reinforced thermoplastic resin composition, you may use what cut the reinforced fiber bundle. In addition, the reinforcing fiber is preferably in the form of a web or mat-like sheet in which reinforcing fibers are randomly oriented from the viewpoint of obtaining a mechanically isotropic fiber.

  The resin used for the thermoplastic resin sheet 1 is preferably a thermoplastic resin, for example, polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) resin, polytrimethylene terephthalate (PTT) resin, polyethylene naphthalate (PEN) resin, Polyester resin such as liquid crystal polyester resin, polyolefin resin such as polyethylene (PE) resin, polypropylene (PP) resin, polybutylene resin, styrene resin, polyoxymethylene (POM) resin, polyamide (PA) resin, Polycarbonate (PC) resin, polymethylene methacrylate (PMMA) resin, polyvinyl chloride (PVC) resin, polyphenylene sulfide (PPS) resin, polyphenylene ether (PPE) resin, modified PPE resin, thermoplasticity Reimide (PI) resin, polyamideimide (PAI) resin, polyetherimide (PEI) resin, polysulfone (PSU) resin, modified PSU resin, polyethersulfone (PES) resin, polyketone (PK) resin, polyetherketone (PEK) ) Resin, polyether ether ketone (PEEK) resin, polyether ketone ketone (PEKK) resin, polyarylate (PAR) resin, polyether nitrile (PEN) resin, thermoplastic phenol resin, phenoxy resin, polytetrafluoroethylene resin Fluorine resins such as polystyrene resins, polyolefin resins, polyurethane resins, polyester resins, polyamide resins, polybutadiene resins, polyisoprene resins, thermoplastic resins such as fluorine resins, etc. Copolymers, modification products, and two or more blended resins. Among these, a resin mainly composed of polypropylene (PP), polyamide (PA), or polyphenylene sulfide (PPS) resin is preferable from the viewpoint of mechanical properties such as strength, rigidity, and economy. A polyamide (PA) resin is more preferable from the viewpoints of flame retardancy, impact characteristics, and economy.

  The suppression layer 3 that suppresses the passage of fibers has innumerable voids smaller than the fiber length constituting the reinforcing fiber base 2, suppresses the permeation of fibers through the voids, and allows only the molten thermoplastic resin to permeate. Can do. As a result, the reinforcing fibers constituting the reinforcing fiber base 2 cannot diffuse into the resin-only layer 6, and the resin-only layer 6 is formed.

  As the suppression layer 3 for suppressing the passage of fibers, a non-woven fabric made of paper is preferable. Examples of the fibers constituting the non-woven fabric include metal fibers such as aluminum fibers, brass fibers and stainless fibers, polyacrylonitrile-based, rayon-based, and lignin. Carbon fiber, graphite fiber, glass fiber, silicon carbide fiber, silicon nitride fiber, aramid fiber, polyparaphenylene benzobisoxazole (PBO) fiber, polyphenylene sulfide fiber, polyester fiber Organic fibers such as acrylic fibers, nylon fibers, polyethylene fibers, pulp fibers, and the like can be used. These reinforcing fibers may be used alone or in combination of two or more. Among these, glass fiber or PET fiber is preferable from the viewpoint of economy.

Furthermore, the basis weight of the suppression layer 3 is preferably ²⁰ to 100 g / m ² . If the basis weight is larger than this, the resin cannot pass sufficiently, and the adhesive strength between the layers is lowered. Moreover, when a fabric weight is smaller than this, a fiber also passes and it does not function as a suppression layer.

  The composite material layer 5 in which the reinforcing fiber base 2 is impregnated with the thermoplastic resin of the thermoplastic resin sheet 1 by the above-described production method preferably contains the component (a) in a proportion of 25 to 80% by mass. . In view of the mechanical properties of the molded product obtained by the present invention, it is more preferable that the molded product is contained in a proportion of 30 to 75% by mass. When the mass content of the carbon fiber is 25% by mass or more, the reinforcing effect of the reinforcing fiber of the molded body obtained by the press molding method of the present invention is exhibited, so that the bending strength required when used as a structural member is obtained. Can demonstrate. Moreover, when the mass content of the carbon fiber is 80% by mass or less, the impregnation of the thermoplastic resin between the reinforcing fiber and the thermoplastic resin can be satisfied, and the moldability can be secured.

  Further, the component (a) is preferably 1 to 50 mm.

The mass average fiber length of the reinforcing fibers is more preferably 1.5 to 26 mm, and further preferably 2 to 6.5 mm. When the mass average fiber length of the reinforcing fiber is longer than 1 mm, the fiber reinforcing effect is large, which is suitable for use as a structural member. Further, when the mass average fiber length of the reinforcing fibers is shorter than 50 mm, the steric hindrance due to the entanglement of the reinforcing fibers can be reduced, so that the occurrence of defects in the molded body obtained by the press molding method of the present invention can be suppressed. This is preferable because it is possible. The average fiber diameter of the reinforcing fibers is not particularly limited, but is preferably in the range of 1 to 20 μm and in the range of 3 to 15 μm from the viewpoint of mechanical properties and surface appearance of the obtained molded product. More preferred. Here, the mass average fiber length is calculated from the following formula.
Lw = Σ (wi × Li) / Σwi
wi: individual reinforcing fiber mass Li: individual reinforcing fiber length

Specifically, after the molded product or pellet is fired and the resin content is removed, the fiber length of 400 randomly extracted reinforcing fibers is measured. More specifically, the measurement visual field 1 cm × 1 cm was magnified 30 to 40 times with a microscope, the length was measured with a ruler, and the measurement visual field was slid until the total number of measurements reached 400. Each reinforcing fiber mass w i is calculated by the following equation.
wi = (density of reinforcing fiber) × (length of reinforcing fiber) × (radius of reinforcing fiber) 2 × π

  Furthermore, it is preferable that the compounding quantity of a component (b) is a ratio of 20-75 mass%. Like the viewpoint of the content of the reinforcing fiber, it is more preferable that the reinforcing fiber is contained in a proportion of 25 to 70% by mass.

  The resin-only layer 6 can be the one in which the thermoplastic resin sheet 1 remains without being melted by hot pressing. Thus, in order to leave as the resin-only layer 6, a method in which the temperature of the hot press is in the range of 220 ° C. to 300 ° C. and the press pressure is 10 MPa or less in order to maintain the shape of the nonwoven fabric of the suppression layer 3. Is preferably used.

  The molded body obtained by the press molding method of the present invention can be developed for various uses. Parts for automobiles and motorcycles such as various modules such as instrument panels, door beams, under covers, lamp housings, pedal housings, radiator supports, spare tire covers, front ends, notebook computers, mobile phones, digital still cameras, PDAs, plasmas Electrical and electronic parts such as displays, telephones, facsimiles, VTRs, photocopiers, televisions, microwave ovens, audio equipment, toiletries, laser discs (registered trademark), refrigerators, air conditioners and other household and office electrical parts, civil engineering and architecture It can be used for various applications such as automotive parts and aircraft parts, and is particularly preferably used for electronic equipment parts and automobile parts.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, the main point of this invention is not limited to a following example.

[Method for evaluating sandwich structure]
After cutting out any part of the molded composite molded product and polishing the cross section, the cross section is observed with a microscope (VHX-500 manufactured by KEYENCE CORPORATION), and a layer of resin alone and a layer of reinforced fiber composite material are formed. If it has passed.

[PAN-based carbon fiber used for reinforcing fiber base]
A PAN-based carbon fiber (manufactured by Toray Industries, Inc., “Torayca (registered trademark)”, T700SC-24000) was used as the reinforcing fiber.

  The manufacturing method of the reinforced fiber base material 2 is as follows. The carbon fiber continuous bundle described above was cut with a cartridge cutter to obtain a chopped yarn having a fiber length of 6.4 mm. 100 liters of a 1.5 wt% aqueous solution of “sodium n-dodecylbenzenesulfonate (product name)” manufactured by Wako Pure Chemical Industries, Ltd. was stirred to prepare a foamed dispersion. The chopped yarn obtained was put into this dispersion, stirred for 10 minutes, poured into a paper machine having a paper surface, dehydrated by suction, and then dried at a temperature of 150 ° C. for 2 hours. A non-woven fabric (hereinafter abbreviated as CF) was obtained.

Example 1
CF having a weight of 250 g / m ² was used. A 0.52 mm thick sheet using polyamide 6 resin (manufactured by Toray Industries, Inc., “Amilan (registered trademark)” CM1001, specific gravity: 1.13, plasticizing temperature: 225 ° C.) was used as the thermoplastic resin sheet. Further, a glass fiber nonwoven fabric (manufactured by Nittobo Co., Ltd., MF30P-104LS, basis weight: 30 g / m ² ) (hereinafter abbreviated as GF) was used as the suppression layer.

  The laminated structure was resin sheet / CF / GF / resin sheet / GF / CF / resin sheet.

  The hot press temperature was 250 ° C., the cold press temperature was 100 ° C., the molding pressure was 4 MPa, and the pressing time was 1 minute. Conditions and results are summarized in Table 1.

(Example 2)
Glass fiber nonwoven fabric of 60 g / ^{m 2} for suppressing layer reinforcing fiber (manufactured by Nitto Boseki (Ltd.), MF60P-104LS, basis weight: 60g / ^{m 2)} was. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 1.

(Example 3)
The layer which suppresses a reinforced fiber was made into a 71 g / m < ² > glass fiber nonwoven fabric (Olivest Co., Ltd. product, SB-070, basis weight: 71 g / m < ² >). Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 1.

Example 4
The layer for suppressing the reinforcing fibers was a PET fiber nonwoven fabric (manufactured by Vilene Co., Ltd., LMW-9007, basis weight: 70 g / m ² ). Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 1.

(Example 5)
The hot press temperature was 240 ° C. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 1.

(Example 6)
The hot press temperature was 290 ° C. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 1.

(Example 7)
The cold press temperature was 150 ° C. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 1.

(Example 8)
The cold press temperature was 50 ° C. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 1.

Example 9
The press pressure was 8 MPa. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 1.

(Comparative Example 1)
The layer for suppressing the reinforcing fibers was a glass cloth (manufactured by Nittobo Co., Ltd., WFA110D 100BS6, basis weight 97 g / m ² ). Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 2.

(Comparative Example 2)
^Two layers of 60 g / m ² glass fiber nonwoven fabric (manufactured by Nittobo Co., Ltd., MF60P-104LS, basis weight: 60 g / m ² ) were stacked to form a layer of 120 g / m ² glass fiber nonwoven fabric. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 2.

(Comparative Example 3)
The hot press temperature was 200 ° C. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 2.

(Comparative Example 4)
The hot press temperature was 180 ° C. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 2.

(Comparative Example 5)
The press pressure was 1 MPa. Other than that was carried out under the same configuration and conditions as in Example 1. Conditions and results are summarized in Table 2.

  From the above, in Examples 1 to 9, formation of the resin layer could be confirmed. On the other hand, in Comparative Examples 1 to 5, problems such as the inability to form a resin layer, the inability to form a composite material layer, and peeling between layers occurred.

  The fiber-reinforced thermoplastic obtained in the present invention is lightweight and excellent in mechanical properties, and can be accompanied by properties such as electromagnetic wave shielding and high heat resistance depending on the fiber type, so that it can be used in electrical / electronic equipment parts, civil engineering / It can be used for various applications such as building parts, automobile / motorcycle parts, aircraft parts and the like.

1: Thermoplastic resin sheet 2: Reinforced fiber substrate 3: Suppression layer 4: Composite molded article 5: Reinforced fiber composite material 6: Resin-only layer

Claims (12)

At least one layer is formed by laminating a reinforcing fiber substrate, a thermoplastic resin sheet, a suppression layer that suppresses the passage of reinforcing fibers, melting the thermoplastic resin sheet with a hot press, impregnating the reinforcing fibers, and solidifying with a cold press. Is a fiber-reinforced composite material layer and a method for producing a composite molded article having at least one layer made of resin alone. The method for producing a composite molded article according to claim 1, wherein the suppression layer is a nonwoven fabric. The method for producing a composite molded article according to claim 2, wherein the nonwoven fabric is papermaking made of glass fiber or organic fiber. Method of manufacturing a composite molded article according to claim 3 having a basis weight of said paper is 20 to 100 g / ^{m 2.} The manufacturing method of the composite molded product in any one of Claims 1-4 in which the said fiber reinforced composite material layer has the following components (a) and a component (b).
Component (a): Reinforcing fiber: 25-80% by mass
Component (b): Polyamide resin: 20 to 75% by mass The method for producing a composite molded article according to claim 5, wherein the reinforcing fiber of the component (a) has a fiber length of 1 to 50 mm. The method for producing a composite molded article according to claim 5 or 6, wherein the reinforcing fibers are carbon fibers. The method for producing a composite molded product according to claim 1, wherein the thermoplastic resin sheet is made of a polyamide resin. The method for producing a composite molded article according to any one of claims 1 to 8, wherein the hot press temperature is in the range of the melting point of the component (b) to the melting point + 80 ° C. The method for producing a composite molded article according to claim 9, wherein the cold press temperature is not higher than a solidification temperature of the thermoplastic resin of the component (b). The method for producing a composite molded article according to any one of claims 1 to 10, wherein the pressure applied to the projected areas of the hot press and cold press is 2 MPa to 10 MPa. The composite molded product obtained by the manufacturing method of the composite molded product according to any one of claims 1 to 11, which is a part / member used for an automobile, an electric / electronic device, a home appliance, or an aircraft.

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