Epoxy resin composition, prepreg, and carbon fiber-reinforced composite material

Patent metadata

Field	Value
Publication number	US-11034810-B2
Application number	US-201816491050-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 22, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

An object of the present invention is to provide an epoxy resin composition capable of providing a carbon fiber-reinforced composite material that is excellent in moldability, heat resistance, and mechanical properties such as tensile strength and compression strength, and a prepreg. The present invention provides an epoxy resin composition containing at least components [A] to [D] shown below: [A]: an epoxy resin having a xylene group; [B]: a glycidyl amine epoxy resin having three or more glycidyl groups in a molecule; [C]: a thermoplastic resin; and [D]: an aromatic polyamine, the epoxy resin composition containing 10 to 80 parts by mass of the component [A] and 20 to 90 parts by mass of the component [B] based on 100 parts by mass in total of epoxy resins, and also 1 to 25 parts by mass of the component [C] based on 100 parts by mass in total of epoxy resins.

First claim

The invention claimed is:

1. An epoxy resin composition comprising at least components [A] to [D] shown below:
[A]: an epoxy resin having a xylene group;
[B]: a glycidyl amine epoxy resin having three or more glycidyl groups in a molecule;
[C]: a thermoplastic resin; and
[D]: an aromatic polyamine,

wherein:
the epoxy resin composition comprising 10 to 80 parts by mass of the component [A] and 90 to 20 parts by mass of the component [B] based on 100 parts by mass in total of epoxy resins, and also 1 to 25 parts by mass of the component [C] based on 100 parts by mass in total of epoxy resins,
a mixing ratio [A]/[B] between the component [A] and the component [B] being 0.25 to 2.3, and
the component [A] having an epoxy equivalent of 200 to 350 g/eq.

2. The epoxy resin composition according to claim 1 , comprising 40 to 80 parts by mass of the component [A] and 60 to 20 parts by mass of the component [B] based on 100 parts by mass in total of epoxy resins.

3. The epoxy resin composition according to claim 2 , wherein the component [D] is an aromatic polyamine having 1 to 4 phenyl groups in a molecule, and at least one of the phenyl groups has an amino group at an ortho position or a meta position.

4. A prepreg comprising a carbon fiber, and the epoxy resin composition according to claim 2 impregnated into the carbon fiber.

5. A carbon fiber-reinforced composite material comprising a cured product of the epoxy resin composition according to claim 2 , and a carbon fiber.

6. The epoxy resin composition according to claim 1 , wherein the component [D] is an aromatic polyamine having 1 to 4 phenyl groups in a molecule, and at least one of the phenyl groups has an amino group at an ortho position or a meta position.

7. A prepreg comprising a carbon fiber, and the epoxy resin composition according to claim 6 impregnated into the carbon fiber.

8. A prepreg comprising a carbon fiber, and the epoxy resin composition according to claim 1 impregnated into the carbon fiber.

9. The prepreg according to claim 8 , wherein the carbon fiber is in a form of a woven fabric.

10. A carbon fiber-reinforced composite material that is a cured product of the prepreg according to claim 9 .

11. A carbon fiber-reinforced composite material that is a cured product of the prepreg according to claim 8 .

12. A carbon fiber-reinforced composite material comprising a cured product of the epoxy resin composition according to claim 1 , and a carbon fiber.

Assignees

• Toray Industries

Inventors

• Aoki Junichi
• Furukawa Koji
• Arai Atsuhito
• Misumi Jun
• Sakata Hiroaki
• Ochi Takashi

Classifications

• C08L63/00 Primary

  Compositions of epoxy resins; Compositions of derivatives of epoxy resins · CPC title

• C08J5/249

  characterised by the additives used in the prepolymer mixture · CPC title

• C08J5/243

  using carbon fibres · CPC title

• C08J5/042 Primary

  with carbon fibres · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title