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Prepreg and carbon-fiber-reinforced composite material

A prepreg and carbon fiber technology, applied in the direction of carbon fiber, fiber processing, thin material processing, etc., can solve the problems that it is difficult to achieve high adhesion of matrix resin, low reactivity, and no simultaneous satisfaction, etc., to achieve excellent adhesion , little change over time, and excellent impact resistance

Active Publication Date: 2015-04-08
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] For example, in Patent Document 5, 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 5 and any other documents (Patent Documents 6-9, 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
[0015] In addition, Patent Document 10 discloses that a polyfunctional aliphatic compound exists in the inner layer of the sizing agent, and an aromatic epoxy resin and an aromatic-based reactant with low reactivity exist in the outer layer, and that the prepreg is suppressed when long-term retention is expected. However, since there is no polyfunctional aliphatic compound with high adhesion on the surface 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

Embodiment 1

[0434] This embodiment includes the following process I, process II and process III.

[0435] ・Step I: A step of producing carbon fiber as a raw material

[0436] A copolymer composed of 99 mol% of acrylonitrile and 1 mol% of itaconic acid was spun and fired to obtain a total number of filaments of 24,000, a total fineness of 1,000Tex, a specific gravity of 1.8, a strand tensile strength of 5.9GPa, and a strand tensile elastic modulus Carbon fiber with a weight of 295GPa. 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 carboxylic acid concentratio...

Embodiment 2～8

[0442] ・Step I: A step of producing carbon fiber as a raw material

[0443] It carried out similarly to Example 1.

[0444] ・The second step: the step of attaching the sizing agent to the carbon fiber

[0445]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 surface of the sizing agent, and ΔTg are all as expected, and the adhesiveness measured by IFSS is also sufficiently high. The results are shown in Table 1.

[0446] ・Third process: Production, molding and evaluation of unidirectional prepreg

[0447] Pre...

Embodiment 9～13

[0451] ・Step I: A step of producing carbon fiber as a raw material

[0452] It carried out similarly to Example 1.

[0453] ・The second step: the step of attaching the sizing agent to the carbon fiber

[0454] A sizing agent-coated carbon fiber was obtained in the same manner as in Example 2, except that the mass ratio shown in Table 2 was used as the sizing agent. 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 surface of the sizing agent, and ΔTg are all as expected, and the adhesiveness measured by IFSS is also sufficiently high. The results are shown in Table 2.

[0455] ・Third process: Production, molding and evaluation of unidirectional prepreg

[0456] Prepregs were f...

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Abstract

Provided are a prepreg that is excellent in adhesiveness between carbon fibers and a matrix resin and long-term storage stability and achieves both excellent impact resistance and electrical conductivity in the thickness direction and a carbon fiber reinforced composite material. The present invention provides a prepreg formed by impregnating sizing agent-coated carbon fibers coated with a sizing agent containing an aliphatic epoxy compound (A) and an aromatic epoxy compound (B1) with a thermosetting resin composition containing thermoplastic resin particles (F) and conductive particles (G) in a mass ratio of 1:1 to 1,000 or conductive particles (H) in which a thermoplastic resin is covered with a conductive substance. An (a) / (b) ratio is within a predetermined range where (a) is a height of a component at a binding energy assigned to CHx, C-C, and C=C and (b) is a height of a component at a binding energy assigned to C-O in a C 1s core spectrum of 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 having both excellent impact resistance and electrical conductivity, and long-term storage stability. Background technique [0002] Carbon fiber-reinforced composite materials are useful due to their excellent strength, rigidity, and electrical conductivity, and are widely used in aircraft structural members, windmill blades, automobile outer panels, IC trays, and notebook computer casings (housings) And other computer applications, etc., its demand is increasing year by year. [0003] Carbon fiber-reinforced composite materials are generally heterogeneous materials obtained by molding prepregs with reinforcing fibers, that is, carbon fibers and matrix resin as essential components. There are large differences in the mechanical properties in directions other than the . It is known that the impact resistance expressed, for example, by the resistance to falling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24D06M13/11D06M15/55D06M101/40
CPCC08J5/24C08G59/38C08J5/10D06M15/55C08L63/00C08J2363/00C08J5/06D06M13/11D06M2101/40Y10T428/254Y10T428/31511C08J5/249C08J5/248C08K7/06C08J5/243C08J2300/24
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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