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Prepreg and carbon-fiber-reinforced composite material

A prepreg and carbon fiber technology, applied in the field of prepreg and carbon fiber reinforced composite materials, can solve the problems of strength, rigidity reduction, overall fracture, etc., and achieve the effect of excellent interlayer toughness of type II

Inactive Publication Date: 2020-12-04
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When tensile or compressive stress is applied to the above-mentioned thick-walled member or curved-surface member, there may be cases where peeling stress toward the out-of-plane direction between the prepreg fiber layers occurs, and an opening mode (opening mode) occurs between the layers. Due to the progress of the crack, the overall strength and rigidity of the component will be reduced, and even the overall fracture will be caused.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9、 comparative example 1～12

[0347] According to the compounding ratios in Tables 1 and 2, the epoxy resin composition for carbon fiber reinforced composite materials was produced by using the above (12) steps of preparation of the epoxy resin composition. Using the obtained epoxy resin composition, the nematic phase-isotropic phase transition temperature of the resin composition containing the constituent elements [B] and [C] was measured by the procedure of (17) above, and the temperature was measured by (13) prepreg The prepreg production step yields a prepreg. Using the obtained prepreg, the above-mentioned (18) type I interlaminar toughness (G IC ) Fabrication of flat panels made of composite materials for testing and G IC Determination, (19) Type II interlaminar toughness (G IIC ) Fabrication of flat panels made of composite materials for testing and G IIC Measurement, (23) Polarizing microscope observation of carbon fiber-reinforced composite materials, (24) Wide-angle X-ray diffraction measurem...

Embodiment 10～22、 comparative example 13～23

[0356] According to the mixing ratios in Table 3 and Table 4, the prepreg was obtained by using the above-mentioned step (14). Using the obtained prepreg, the above-mentioned (28) The presence ratio of the constituent element [D] present in the range of the depth of 20% of the thickness of the prepreg, (18) Type I interlaminar toughness (G IC ) Fabrication of flat panels made of composite materials for testing and G IC Determination, (19) Type II interlaminar toughness (G IIC ) Fabrication of flat panels made of composite materials for testing and G IICMeasurement, (23) Polarizing microscope observation of carbon fiber-reinforced composite materials, (24) Wide-angle X-ray diffraction measurement of prepregs, (25) Measurement of anisotropy in resin compositions based on polarized Raman spectroscopy, (20 ) Fabrication and measurement of flat plates made of composite materials for 0° tensile strength test, (29) Measurement of interlaminar resin layer thickness of carbon fiber r...

Embodiment 23～28、 comparative example 24～27

[0360] According to the compounding ratio in Table 5, a prepreg was obtained by the above-mentioned procedure (15). Using the obtained prepreg, the above-mentioned (28) The presence ratio of the constituent element [D] present in the range of the depth of 20% of the thickness of the prepreg, (18) Type I interlaminar toughness (G IC ) Fabrication of flat panels made of composite materials for testing and G IC Determination, (19) Type II interlaminar toughness (G IIC ) Fabrication of flat panels made of composite materials for testing and G IIC Measurement, (23) Polarizing microscope observation of carbon fiber-reinforced composite materials, (24) Wide-angle X-ray diffraction measurement of prepregs, (25) Measurement of anisotropy in epoxy resin compositions based on polarized Raman spectroscopy, (20) Preparation and measurement of flat plates made of composite materials for 0° tensile strength test, (29) Measurement of interlaminar resin layer thickness of carbon fiber reinfo...

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Abstract

Provided are: a prepreg which can give a carbon-fiber-reinforced composite material excellent in terms of mode-I interlaminar toughness and mode-II interlaminar toughness; and the carbon-fiber-reinforced composite material. The prepreg comprises constituent elements [A] to [C] and satisfies requirements [I] to [III]. [A]: Carbon fibers coated with a sizing agent [B]: An epoxy resin having a specific structure [C]: A hardener for [B] [I]: An epoxy resin composition comprising constituent elements [B] and [C] has a nematic-isotropic phase transition temperature in the range of 130-180 DEG C. [II]: The prepreg, when isothermally held at 100 DEG C for 30 minutes and then examined by wide-angle X-ray diffraction at 100 DEG C, does not have a higher-order structure derived from a diffraction angle 2theta of 1.0-6.0 degrees. [III]: The prepreg, when isothermally held at 180 DEG C for 2 hours and then examined by wide-angle X-ray diffraction at 180 DEG C, has a higher-order structure derived from a diffraction angle 2theta of 1.0-6.0 degrees.

Description

technical field [0001] The present invention relates to a prepreg capable of obtaining a carbon fiber reinforced composite material having both excellent Type I interlaminar toughness and Type II interlaminar toughness, and a carbon fiber reinforced composite material. Background technique [0002] Conventionally, fiber-reinforced composite materials composed of reinforcing fibers such as carbon fibers and glass fibers and thermosetting resins such as epoxy resins and phenolic resins are lightweight, and have excellent mechanical properties such as strength and rigidity, heat resistance, and corrosion resistance. It is used in a large number of fields such as aviation and aerospace, automobiles, railway vehicles, ships, civil engineering, and sporting goods. In particular, for applications requiring high performance, fiber-reinforced composite materials using continuous reinforcing fibers are used, and carbon fibers excellent in specific strength and specific elastic modulus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24
CPCC08J5/243C08J2363/02C08J5/249C08J5/248Y02E10/72C08J5/042C08K7/06C08K3/04C08K9/04C08G59/5033C08J2363/00C08J5/06C08J2371/02C08J2377/00C08J2379/08C08J2481/04C08J2481/06C08K5/18
Inventor 杉本笃希新井厚仁古川浩司渡辽平
Owner TORAY IND INC