Prepreg and carbon fiber reinforced composite material

A prepreg and carbon fiber technology, applied in carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of low reactivity, difficulty in achieving high adhesion of matrix resin, and no simultaneous satisfaction, so as to achieve less change over time , excellent microcrack resistance, and excellent adhesion

Active Publication Date: 2015-06-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] For example, in Patent Document 7, in order to improve the adhesion between carbon fibers and the sizing agent, it is disclosed that the sizing agent has an inclined structure, but it can be said that in Patent Document 7 and any other documents (Patent Documents 8-11, etc.), there At the same time, it satisfies the idea of ​​suppressing the reaction of the epoxy compound with high adhesion to carbon fiber on the surface of the size layer and the components in the matrix, and achieving high adhesion to the matrix resin
[0020] In addition, Patent Document 12 discloses that a polyfunctional aliphatic compound exists in the inner layer of the sizing agent, and a low-reactivity aromatic epoxy resin and aromatic reactant exist in the outer layer, and it is expected that the prepreg can be suppressed in the case of long-term maintenance. Preform changes over time, but since there is no polyfunctional aliphatic compound with high adhesion on the surface layer of the sizing agent, it is difficult to achieve high adhesion to the matrix resin

Method used

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  • Prepreg and carbon fiber reinforced composite material
  • Prepreg and carbon fiber reinforced composite material
  • Prepreg and carbon fiber reinforced composite material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0358] (A) Preparation of resin

[0359] 100 parts by mass of bisphenol A epoxy compound "jER (registered trademark)" 828 (manufactured by Mitsubishi Chemical Co., Ltd.) and 14.5 parts by mass of m-phenylenediamine (manufactured by Sigma-Aldrich Japan Co., Ltd.) were placed in containers . Thereafter, heating was performed at a temperature of 75° C. for 15 minutes in order to lower the viscosity of jER828 and dissolve m-phenylenediamine. Thereafter, the two were thoroughly mixed, and vacuum defoaming was carried out at a temperature of 80° C. for about 15 minutes.

[0360] (B) Fix the carbon fiber monofilament to the special mold

[0361] A single fiber is extracted from a carbon fiber bundle, and both ends are fixed in the longitudinal direction of a dumbbell-shaped mold with an adhesive while a certain tension is applied to the single fiber. Thereafter, in order to remove moisture adhering to the carbon fibers and the mold, vacuum drying was performed at a temperature of ...

Embodiment 1

[0443] This embodiment includes the following I process, II process, III process and IV process.

[0444] ・Step I: A step of producing carbon fiber as a raw material

[0445] Spinning and firing a copolymer composed of 99 mol% of acrylonitrile and 1 mol% of itaconic acid, the total number of filaments is 6,000, the total fineness is 250Tex, the specific gravity is 1.8, the tensile strength of the strand is 5.9GPa, and the tensile modulus of elasticity of the strand is obtained 295GPa carbon fiber. Next, using an aqueous solution of ammonium bicarbonate at a concentration of 0.1 mol / L as an electrolyte, the carbon fibers were subjected to electrolytic surface treatment with an electric quantity of 80 coulombs per 1 g of carbon fibers. Next, the electrolytic surface-treated carbon fibers were washed with water and dried in heated air at a temperature of 150° C. to obtain carbon fibers as raw materials. At this time, the surface oxygen concentration (O / C) was 0.15, the surface ...

Embodiment 2～8

[0453] ・Step I: A step of producing carbon fiber as a raw material

[0454] It carried out similarly to Example 1.

[0455] ・The second step: the step of attaching the sizing agent to the carbon fiber

[0456] Except having used (A) component and (B1) component shown in Table 1 as a sizing agent, it carried out similarly to Example 1, and obtained the sizing agent carbon fiber. Next, the epoxy equivalent of the sizing agent was measured, X-ray photoelectron spectroscopy was performed on the surface of the sizing agent, and the interfacial shear strength (IFSS) and ΔTg of the carbon fiber coated with the sizing agent were measured. It can be seen that the epoxy equivalent of the sizing agent, the chemical composition of the sizing agent surface, and ΔTg are all as expected, and the adhesiveness measured by IFSS is also sufficiently high. The results are shown in Table 1.

[0457] ·The third process: the production of carbon fiber fabric

[0458] It carried out similarly to ...

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Abstract

To provide a prepreg and a carbon fiber reinforced composite material that are excellent in adhesion between a matrix resin and carbon fibers and long-term storage stability and also excellent in microcrack resistance due to the increased toughness. The present invention provides a prepreg that includes; agent-coated carbon fibers coated with a sizing agent; and a thermosetting resin composition impregnated into the sizing agent-coated carbon fibers. The sizing agent includes an aliphatic epoxy compound (A) and an aromatic epoxy compound (B1). The sizing agent-coated carbon fibers are in a shape of woven fabric or braid. The thermosetting resin composition includes a thermosetting resin (D), a thermoplastic resin (F), and a latent hardener (G). The sizing agent-coated carbon fibers have an (a)/(b) ratio in a certain range where (a) is the height of a component at a binding energy assigned to CHx, C-C, and C=C and (b) is the height of a component at a binding energy assigned to C-O in a C 1s core spectrum of the surfaces of the sizing agent-coated carbon fibers analyzed by X-ray photoelectron spectroscopy.

Description

technical field [0001] The present invention relates to a prepreg and a carbon fiber-reinforced composite material suitable for sports applications such as golf clubs and fishing rods represented by aircraft components, spacecraft components, automobile components, and ship components, and other general industrial applications. More specifically, the present invention relates to a prepreg and a carbon fiber-reinforced composite material that have excellent adhesion between a matrix resin and carbon fibers and microcrack resistance, and can suppress deterioration of mechanical properties such as tensile strength during long-term storage. Background technique [0002] Fiber-reinforced composite materials made of reinforcing fibers such as glass fibers, carbon fibers, and aramid fibers and matrix resins are lightweight and have excellent mechanical properties such as strength and elastic modulus compared with competing metals, so they are used in aircraft components , spacecraf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24D06M13/11D06M15/55D06M101/40
CPCD06M13/11D06M15/55D06M2101/40C08J2300/24C08J2363/00C08J2481/06C08J5/249C08J5/248C08J5/042C08L2205/035C08L2205/025C08J5/243C08K7/06C08L63/00
Inventor 荒井信之市川智子大皷宽远藤真小林正信三角润
Owner TORAY IND INC
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