JP2000246806A - Member made of fiber-reinforced plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member made of fiber-reinforced plastic in which compression strength is remarkably enhanced more than in the conventional practice by windening a degree of freedom for design of the member made of FRP. SOLUTION: In the member made of fiber-reinforced plastic in which a layer consisting of reinforcing fiber and a matrix resin is laminated, the following at least one [A] layer is provided and [B] layers are provided adjacently to both faces of the [A] layer. Thickness of the [B] layer on at least one side is in a range within 0.02-0.085 for thickness of the [A] layer. Tensile ductility in the direction orthogonal to the orientation direction of reinforcing fiber of the [A] layer is >=0.82%. The [A] layer is such a layer that reinforcing fiber is oriented substantially in one direction. The [B] layer is such a layer that reinforcing fiber is oriented in a range within 40-80 deg. absolute value of orientation angle θ for the orientation direction of reinforcing fiber of the [A] layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced plastic member having a high resistance to various loads including compression.

[0002]

2. Description of the Related Art Fiber-reinforced plastics (hereinafter abbreviated as FRP) have a high tensile strength per unit weight in the direction in which reinforcing fibers are arranged, and are therefore widely used for members requiring weight reduction, such as aircraft structural materials and sports materials. Have been done.

However, loads applied to members in an actual structure are complicated, and loads in various modes such as compression and shearing are applied from various directions in addition to tension. In particular, for compressive load, the use of FRP is not limited because the compressive strength of FRP is not as superior as the tensile strength compared to other materials, and therefore its use may be limited. Therefore, it is strongly desired to improve the compressive strength of FRP. Have been.

As a method for improving the compressive strength of a member made of FRP, Japanese Patent Application Laid-Open No. 8-224814 discloses a layer in which reinforcing fibers are arranged substantially in one direction (hereinafter, abbreviated as a center layer).
(Hereinafter referred to as side layers) having a specific reinforcing fiber arrangement angle and a specific layer thickness are disposed adjacent to both sides. However, in this method, the load generated secondarily by the compressive load causes destruction of the center layer or the side layer, or delamination between the center layer and the side layer or within each layer triggers the destruction of the member. Therefore, the effect of improving the compressive strength was sometimes insufficient.

In addition, since the reinforcing fiber arrangement angle and the layer thickness of the side layer are limited to a narrow range, there is a problem that the degree of freedom of design such as rigidity of the member is narrowed.

That is, in the conventional FRP member, it has been required to further increase the degree of freedom in designing the member and to greatly improve the compressive strength.

[0007]

The problem to be solved by the present invention is to increase the degree of freedom in designing a FRP member and to significantly improve the compressive strength as compared with the prior art.

[0008]

In order to solve the above-mentioned problems, the present inventor has found that it is effective to use a specific member structure and combine it with a layer or a matrix resin having certain characteristics. And found the present invention. That is, the member of the present invention basically has the following configuration in order to solve the above problems. “A fiber-reinforced plastic member formed by laminating a layer composed of a reinforcing fiber and a matrix resin has at least one of the following [A] layers and a [B] layer adjacent to both sides of the [A] layer. Then θ
Is in the range of 40 ° to 80 °, and the thickness of at least one of the [B] layers is 0.02 with respect to the thickness of the [A] layer.
A fiber-reinforced plastic member having a tensile elongation in the range of 0.085 to 0.085 and a direction perpendicular to the arrangement direction of the reinforcing fibers of the layer [A] of 0.82% or more. [A] layer: a layer in which reinforcing fibers are arranged substantially in one direction [B] layer: a layer in which reinforcing fibers are arranged at an arrangement angle θ with respect to the arrangement direction of the reinforcing fibers in the [A] layer ”

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The FRP member of the present invention will be described in detail below.

[0010] The member of the present invention is formed by laminating layers comprising a reinforcing fiber and a matrix resin. The shape is not limited to a plate shape, but may be a tubular shape, a shell shape, a columnar shape, or the like. However, it is preferably a plate material or a cylindrical body which is easily subjected to a compressive load and the compressive strength of the member often governs the total failure.

Various types of reinforcing fibers such as carbon fiber, glass fiber, aramid fiber, and metal fiber can be used, and a plurality of types can be used in combination. Is preferable, and a polyacrylonitrile-based carbon fiber that provides higher strength is more preferable.

The form of the reinforcing fiber may be a continuous fiber or a discontinuous fiber as long as it has an arrangement in a specific direction, but a continuous fiber having a high reinforcing effect is preferable.

The member of the present invention has a layer in which reinforcing fibers are arranged substantially in one direction (hereinafter referred to as [A] layer).
The layer [A] is a main portion that bears a compressive load applied to the member, and the arrangement direction of the reinforcing fibers thereof preferably matches the direction of the compressive load as much as possible.

When the reinforcing fibers are aligned in the load direction, the elastic modulus and strength in the vertical direction with respect to the load decrease, causing cracks and bending in the lateral direction, and the shear elastic modulus also decreases. In many cases, compressive strength, which should originally be exhibited, does not appear due to shear displacement of the material.

In order to suppress such undesired deformation, both sides of the [A] layer are formed on both sides of the [A] layer with reinforcing fibers arranged at an angle θ with respect to the arrangement direction of the reinforcing fibers (hereinafter referred to as [B]).
Layer). Where θ is 40 °
From 80 to 80, preferably from 50 to 70, more preferably from 55 to 65.

The presence of the [B] layer on both sides of the [A] layer can increase the compressive strength of the member as compared to the case where the [B] layer is not present.

As the layer [B], the reinforcing fibers have an arrangement angle θ.
And a layer in which the reinforcing fibers are arranged substantially in one direction at an arrangement angle of -θ. In this case, it is more preferable that the thickness of the layer having the arrangement angle θ is substantially equal to the thickness of the layer having the arrangement angle −θ. Here, the sign of the array angle means that the angle is in the reverse rotation direction.

If the absolute value of θ is too small, the stress acting on the layer [B] will increase, and the fracture will easily start from the layer [B], and the compressive strength of the member will decrease. On the other hand, if the absolute value of θ is too large, the shear stiffness of the layer [B] decreases, and the entire member is easily broken due to shear displacement, and the compressive strength decreases.

The thickness of the layer [B] on at least one side of the layer [A] must be in the range of 0.02 to 0.085 with respect to the thickness of the layer [A], and is 0.05 to 0. It is preferably in the range of 0.07. If the thickness of the layer [B] is smaller than this range, the deformation of the layer [A] cannot be prevented, and the effect of improving the compressive strength is not sufficient. If the thickness is too large, the cross-sectional area and weight of the member increase, and May have lower compressive strength and compressive strength per unit weight than that of the layer [A] alone.

The thickness of the layer [B] is preferably substantially equal on both sides of the layer [A]. This is because the stress distribution and deformation of the [A] layer are made uniform and the substantial strength of the [A] layer is increased by making the structure symmetrical with respect to the [A] layer. Further, for the same reason, it is preferable that the reinforcing fibers of the layer [B] are arranged mirror-symmetrically with respect to the center plane in the layer of the layer [A].

When the member of the present invention is used as a cylinder, a cylinder having high strength can be obtained by making the arrangement direction of the reinforcing fibers of the layer [A] substantially coincide with the axial direction of the cylinder.

In the member of the present invention, the tensile elongation in the direction perpendicular to the arrangement direction of the reinforcing fibers in the layer [A] needs to be 0.82% or more, and 1.0% or more. Is preferred. Here, that the tensile elongation is 0.82% or more means that the strain at which the [A] layer is broken when the member is subjected to tensile deformation is 0.82% or more. By increasing the tensile elongation in the perpendicular direction of the [A] layer, when the member is compressed in the fiber arrangement direction of the [A] layer,
Break modes such as so-called splitting are less likely to occur, and as a result, the compressive strength of the member can be increased. On the other hand, in the member of the present invention, the tensile elongation in the direction perpendicular to the arrangement direction of the reinforcing fibers of the layer [A] is preferably 3.5% or less, more preferably 2% or less. Because if you try to make the elongation too high,
This is because the heat resistance and elastic modulus of the resin tend to decrease, which may eventually have a bad influence on the overall characteristics of the member.

In order to increase the tensile elongation in the direction perpendicular to the direction in which the reinforcing fibers are arranged, it is effective to increase the elongation of the matrix resin in the layer [A] and the adhesive strength with the reinforcing fibers. is there. For this purpose, the matrix resin of the layer [A] is preferably a thermosetting resin composition comprising the following components. (A) Thermosetting resin (A) Compound containing one functional group capable of reacting with the thermosetting resin of (A) or a curing agent thereof, and a partial structure selected from the following formulas (1) to (4)

[0024]

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[0025]

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[0026]

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[0027]

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The thermosetting resin as the component (A)
It refers to a precursor that thermally cures, ie, reacts thermally to give a polymer with a network structure. Specific examples of the thermosetting resin include an epoxy resin, a resin having a plurality of polymerizable unsaturated bonds in a molecule (a vinyl ester resin,
Unsaturated polyester resin, diallyl phthalate resin, maleimide resin), phenol resin, cyanate resin, melamine resin, urea resin, polyurethane resin, benzoxazine resin, oxazoline resin, etc., among which epoxy resin is preferably used. The epoxy resin means a compound having two or more epoxy groups in a molecule.

The structures represented by the formulas (1) to (4) may be a part of a more complicated structure. For example, a typical compound having an amide bond represented by the general formula (1) is Although it is a carboxylic acid amide, it may have an amide bond in a part of the ring in addition thereto, or a more complicated structure such as imide, urethane, urea, biuret, hydantoin, carboxylic acid hydrazide, hydroxamic acid, It may have a structure such as semicarbazide or semicarbazone.

The term "amide bond" as used herein means a partial structure comprising a group selected from a carbonyl group, a thiocarbonyl group, a sulfonyl group and a phosphoryl group, and a nitrogen atom bonded to the carbon by a single bond.

The carbonyl oxygen of the amide bond forms a strong hydrogen bond with a hydrogen atom bonded to oxygen or nitrogen. Therefore, a hydrogen bond with a hydrogen atom such as a carboxyl group or a hydroxyl group present on the surface of the carbon fiber as the reinforcing fiber is generated, and the adhesiveness is enhanced.

Furthermore, since the carbonyl group of the amide bond is a strong permanent dipole, an organic dipole is formed in a reinforcing fiber having a high polarizability such as carbon fiber, and the adhesive force is increased by the electric attraction of the dipole-dipole. Enhance.

If the compound having an amide bond does not have a functional group capable of reacting with an epoxy resin or a curing agent, adhesiveness may not be sufficiently exhibited due to phase separation, or heat resistance may be remarkably reduced by acting as a plasticizer. However, when the compound having an amide bond has a functional group capable of reacting with an epoxy resin or a curing agent, with the curing of the resin composition, it becomes a part of a network of a cured epoxy resin, so that There is no fear of causing such adverse effects.

2 which can react with an epoxy resin or a curing agent
It is known to use an epoxy resin composition containing a compound having at least one functional group and at least one amide bond for a fiber-reinforced composite material. However, in these known techniques, a remarkable improvement in adhesiveness has been confirmed. Not. However, the epoxy resin composition found by the present inventors in which a compound having one functional group and one or more amide bonds capable of reacting with an epoxy resin or a curing agent in the molecule is blended has a remarkable effect.

The reason is that a compound having two or more functional groups capable of reacting with an epoxy resin or a curing agent chemically bonds to an epoxy resin network at two or more locations, so that oxygen atoms of amide bonds are sufficiently present on the reinforcing fiber surface. Compounds having a functional group that can react with the epoxy resin or curing agent, while inaccessible, chemically bond to the epoxy resin network at only one place, so the degree of freedom of movement of the partial structure derived from the compound is large. The present inventors presume that the oxygen atom of the carbonyl group easily contacts the surface of the reinforcing fiber.

Further, the addition of the component (a) not only increases the adhesiveness but also has the effect of increasing the elastic modulus of the cured product of the epoxy resin composition. This is considered to be because the oxygen of the hydroxyl group and the carbonyl group present in the epoxy resin forms a strong hydrogen bond and restricts the molecular motion.

The epoxy resin composition can be obtained from the components (A) and (A), and is not necessarily obtained from the components (A) and (A). It doesn't have to be a thing. Of course, a product obtained from the components (A) and (A) is a preferable example, but as a result, if the configuration is the same as that obtained from the components (A) and (A), For example, the raw materials are not limited to the components (A) and (A). For example, even when a component having two or more functional groups capable of reacting with an epoxy resin or a curing agent is used as the component (a), a part of the functional groups can be partially selected by appropriately selecting a functional group and a process. As a result of deactivation or denaturation, the epoxy resin composition of the present invention can be obtained. Alternatively, conversely, even if it does not have the functional group, the functional group may be modified during the reaction or the process to form the functional group.

The epoxy resin composition of the present invention preferably has at least one amide bond in chemical structure and has a partial structure having a large degree of freedom of movement.
A partial structure having a large degree of freedom of movement is typically a structure in which one end of a molecular chain has a main chain of a composition such as an epoxy resin or a curing agent or a residue thereof or a large molecular weight corresponding thereto. And the other end is a structure that is not covalently bonded to the structure having a large molecular weight as described above. Also, even if there are multiple binding sites,
If they are extremely close together on the partial structure, the binding site can be regarded as substantially one, and the degree of freedom of the partial structure is large. Or, from the viewpoint of a structure having a large molecular weight bonded to both ends on the partial structure,
When the positions are close to each other, the degree of freedom of movement of the substructure may be large. Furthermore, also when the partial structure has a branch having one or more amide bonds, the degree of freedom of movement is large.

It is considered that the component (a) gathered at the interface between the matrix resin and the reinforcing fiber has the effect of improving the adhesiveness. In particular, when the component (a) has a relatively slow curing speed as compared with the epoxy resin, the component (a) tends to gather at the interface, which is preferable.

The functional groups capable of reacting with the epoxy resin include carboxyl groups, phenolic hydroxyl groups, amino groups,
Examples include secondary amine structures and mercapto groups. Examples of the functional group capable of reacting as a curing agent include a double bond conjugated to an epoxy group and a carbonyl group. The double bond conjugated with the carbonyl group performs a Michael addition reaction with an amino group or a mercapto group in the curing agent.

Specific examples of the compound having one carboxyl group and having an amide bond include succinamic acid, oxamic acid, N-acetylglycine, N-acetylalanine, 4-acetamidobenzoic acid, N-acetylanthranilic acid, -Acetamidobutyric acid, 6-acetamidohexanoic acid,
Hippuric acid, 5-hydantoin acetic acid, pyroglutamic acid, 2-
(Phenylcarbamoyloxy) propionic acid and the like.

Specific examples of the compound having one phenolic hydroxyl group and having an amide bond include salicylamide,
Examples thereof include 4-hydroxybenzamide, 4-hydroxyphenylacetamide, 4-hydroxyacetanilide, and 3-hydroxyacetanilide.

Specific examples of the compound having one amino group and having an amide bond include 4-aminobenzamide, 3-aminobenzamide, 4'-aminoacetanilide, 4-aminobutylamide, 6-aminohexanamide, and 3-aminobenzamide. Examples include aminophthalimide and 4-aminophthalimide.

Specific examples of the compound having one secondary amine structure and having an amide bond include nipecotamide, N, N-diethylnipecotamide, isonipecotamide, 1-acetylpiperazine and the like.

Specific examples of the compound having one mercapto group and having an amide bond include 4-acetamidothiophenol and N- (2-mercaptoethyl) acetamide.

Specific examples of the compound having one epoxy group and having an amide bond include glycidamide, N-phenylglycidamide, N, N-diethylglycidamide, N-methoxymethylglycidamide, and N-hydroxymethylglycidamide. , 2,3-epoxy-3-methylbutyramide, 2,3-epoxy-2-methylpropionamide, 9,10-epoxystearamide, N-glycidylphthalimide and the like.

In a compound having one double bond conjugated to a carbonyl group and having an amide bond, the carbonyl group conjugated to the double bond may be the same as or different from the carbonyl group of the amide bond. Compounds in which the carbonyl group conjugated to the double bond is the same as the carbonyl group of the amide bond include amides of α, β-unsaturated carboxylic acids and derivatives having a substituent on the nitrogen atom thereof. Specific examples thereof include acrylamide, methacrylamide, N, N-dimethylacrylamide, N, N-diethylacrylamide, N-tert-butylacrylamide, N-isopropylacrylamide, N-butylacrylamide, N-hydroxymethylacrylamide, and N-hydroxymethylacrylamide. -Methoxymethylacrylamide, N-ethoxymethylacrylamide, Nn-propoxymethylacrylamide, Nn-butoxymethylacrylamide, N-isobutoxymethylacrylamide, N-
Benzyloxymethyl acrylamide, diacetone acrylamide, 1-acryloylmorpholine, 1-acryloylpiperidine. In addition, imides of unsaturated dicarboxylic acids such as maleimide, N-ethylmaleimide, and N-phenylmaleimide are also applicable. Examples of the compound in which the carbonyl group conjugated to the double bond is not the same as the carbonyl group of the amide bond include 2- (phenylcarbamoyloxy) ethyl methacrylate and the like.

The compound having one functional group and one or more amide bonds capable of reacting with an epoxy resin or a curing agent in the molecule as the constituent element (a) may be used alone or in combination of two or more.

The amount of the component (a) (when a plurality of components are used) is preferably 0.5 to 15 parts by weight per 100 parts by weight of the component (A). If the amount is less than 0.5 part, the effect of improving the adhesion is not sufficiently exhibited, and if the amount is more than 15 parts by weight, adverse effects such as a decrease in heat resistance may be caused.

The component (a) may be a liquid or a solid at room temperature. When a solid component is used as the component (a), it may be added to the epoxy resin composition and then dissolved by means such as heating and stirring, or may be added without being dissolved. When the solid component (a) is added without dissolving, it is preferable to use the solid component after pulverizing to a particle size of 10 μm or less.

The member of the present invention has an interlayer shear strength of 90MP.
It is preferably at least a, and more preferably at least 100 MPa. Here, the interlaminar shear strength refers to the interlaminar strength obtained by performing a short span bending test on a laminate obtained by taking out the [A] layer and the [B] layer from the member as an integral unit in the arrangement direction of the reinforcing fibers of the [A] layer. Shear strength. By increasing the interlaminar shear strength, modes such as shearing and delamination can be made less likely to occur under a compressive load, and as a result, the compressive strength of the member can be increased.

In order to increase the interlayer shear strength, [A]
It is effective to increase the elongation of the matrix resin of the layer and increase the adhesive strength with the reinforcing fiber. for that purpose,
[A] The matrix resin of the layer is the component (A)
It is preferably a thermosetting resin composition comprising (a).

In any of the FRP members of the present invention,
When delamination occurs between the [A] layer and the [B] layer, a sufficient effect of improving the compressive strength cannot be obtained. Therefore, it is necessary to increase the delamination strength between the [A] layer and the [B] layer. For this purpose, it is effective that the resin existing between the layers has a high elongation and excellent adhesion to the reinforcing fiber. . Therefore, it is most preferable that both the matrix resin of the layer [A] and the matrix resin of the layer [B] are made of a thermosetting resin composition comprising the above components (A) and (A).

[0054]

EXAMPLES Example 1 The following materials were mixed in a kneader to obtain a resin composition having both components (A) and (A). Bisphenol A type epoxy resin 40 parts ("Epicoat" 828, manufactured by Yuka Shell Epoxy) Bisphenol A type epoxy resin 40 parts ("Epicoat" 1001, manufactured by Yuka Shell Epoxy) Brominated bisphenol A type epoxy Resin 10 parts ("Epiclon" 152, manufactured by Dainippon Ink & Chemicals, Inc.) Tetraglycidyl diaminodiphenylmethane 10 parts ("Sumiepoxy" ELM434, manufactured by Sumitomo Chemical Co., Ltd.) Dicyandiamide 5 parts (DICY7, Yuka Shell Epoxy Co., Ltd.) )) 3- (3,4-dichlorophenyl) -1,1-dimethylurea 3 parts (DCMU99, manufactured by Hodogaya Chemical Industry Co., Ltd.) N, N-dimethylacrylamide (component (a) 5 parts ((Co.) 7 units of polyvinyl formal ("Vinilec" K, Chisso ( As the [A] layer, a prepreg in which carbon fibers (“Treca” T800HB-12K-40B manufactured by Toray Industries, Inc.) are arranged in one direction in this resin composition (molded thickness of prepreg = 0.14 mm, fiber (Weight content = 67%) were laminated in the same direction, and as a [B] layer, a prepreg having the same composition and a molding thickness of only 0.05 mm was arranged at an angle of arrangement of reinforcing fibers of the [A] layer. The two layers were laminated on both sides of the [A] layer so as to be ± 60 ° with respect to the central plane of the [A] layer, and this was placed in an autoclave at 180 ° C. for 2 hours. Cured in a plate-like FRP
A member made of the material was obtained.

By observing the cross section of this FRP member, [A]
The thicknesses of the layer and the [B] layer were measured. Also, ASTM
The tensile elongation in the direction perpendicular to the fiber arrangement of the [A] layer was measured according to D3039. In addition, the interlaminar shear strength by a short span three-point bending method was measured according to ASTM D2344. Table 1 shows the results. (Comparative Example 1) Same molding thickness 0.1 as used in Example 1
Only 4 mm prepregs were laminated in the same direction to obtain an FRP member consisting of only the [A] layer. Next, in the same manner as in Example 1, the thickness of the layer, the tensile elongation perpendicular to the fiber arrangement, and the interlaminar shear strength were measured. Table 1 shows the results. (Comparative Example 2) An FRP member was obtained in the same manner as in Example 1 except that the number of layers of the [A] layer was changed to eight. Next, in the same manner as in Example 1, the thickness of each layer, the tensile elongation perpendicular to the fiber arrangement of the [A] layer, and the interlaminar shear strength were measured. Table 1 shows the results. Comparative Example 3 An FRP member was obtained in the same manner as in Example 1 except that the fiber arrangement angle of the layer [B] was 90 ° with respect to the arrangement direction of the reinforcing fibers of the layer [A]. Next, in the same manner as in Example 1, the thickness of each layer, the tensile elongation perpendicular to the fiber arrangement of the [A] layer, and the interlaminar shear strength were measured. Table 1 shows the results. (Comparative Example 4) An FRP member was obtained in the same manner as in Example 1 except that the fiber arrangement angle of the layer [B] was ± 35 ° with respect to the arrangement direction of the reinforcing fibers of the layer [A]. Next, in the same manner as in Example 1, the thickness of each layer, the tensile elongation perpendicular to the fiber arrangement of the [A] layer, and the interlaminar shear strength were measured. Table 1 shows the results. (Comparative Example 5) The following materials were mixed in a kneader, and an amide bond-containing compound (N-octylpyrrolidone) having no functional group capable of reacting with an epoxy resin or a curing agent was used instead of the component (a). A resin composition was obtained.

The following materials were mixed in a kneader to obtain a resin composition. Bisphenol A type epoxy resin 40 parts ("Epicoat" 828, manufactured by Yuka Shell Epoxy) Bisphenol A type epoxy resin 40 parts ("Epicoat" 1001, manufactured by Yuka Shell Epoxy) Brominated bisphenol A type epoxy Resin 10 parts ("Epiclon" 152, manufactured by Dainippon Ink & Chemicals, Inc.) Tetraglycidyl diaminodiphenylmethane 10 parts ("Sumiepoxy" ELM434, manufactured by Sumitomo Chemical Co., Ltd.) Dicyandiamide 5 parts ("DICY7", Yuka Shell Epoxy) 3- (3,4-dichlorophenyl) -1,1-dimethylurea 3 parts ("DCMU99", (Hodogaya Chemical Industry Co., Ltd.) N-octylpyrrolidone 5 parts (Aldrich Chemical Company) ) Polyvinyl formal 7 parts (“VINYLEC” K F Other using nitrogen Ltd.) The resin composition in the same manner as in Example 1
An RP member was obtained. Next, in the same manner as in Example 1, the thickness of each layer, the tensile elongation perpendicular to the fiber arrangement of the [A] layer, and the interlaminar shear strength were measured. Table 1 shows the results.

[0057]

[Table 1]

According to the present invention, the compressive strength can be remarkably improved as compared with the conventional one, while the degree of freedom in designing the FRP member is widened, and the plate-shaped or cylindrical FRP member can be significantly reduced in weight. Becomes

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Claims (3)

[Claims] 1. A fiber-reinforced plastic member obtained by laminating a layer comprising a reinforcing fiber and a matrix resin,
It has at least one next [A] layer and a [B] layer adjacent to both sides of the [A] layer, and the thickness of at least one side of the [B] layer is 0.1 mm relative to the thickness of the [A] layer. A fiber reinforced plastic member having a tensile elongation in the range of 02 to 0.085 and perpendicular to the arrangement direction of the reinforcing fibers of the layer [A] of 0.82% or more. [A] layer: a layer in which reinforcing fibers are arranged substantially in one direction [B] layer: the absolute value of the array angle θ with respect to the reinforcing fiber array direction of the [A] layer is in the range of 40 ° to 80 °. The layer where the reinforcing fibers are arranged 2. The fiber reinforced plastic member according to claim 1, wherein the fiber reinforced plastic member has an interlaminar shear strength of 90 MPa or more. 3. The matrix resin of the layer [A] or the layer [B] is mainly composed of the following component (A) and component (A)
The fiber reinforced plastic member according to claim 1 or 2, wherein the member can be obtained from 0.5 to 20 parts by weight of the component (a) based on 100 parts by weight. (A) Thermosetting resin (A) Compound containing one functional group capable of reacting with the thermosetting resin of (A) or a curing agent thereof, and a partial structure selected from the following formulas (1) to (4) Embedded image Embedded image Embedded image Embedded image