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

Patent metadata

Field	Value
Publication number	US-9683072-B2
Application number	US-201314650027-A
Country	US
Kind code	B2
Filing date	Oct 31, 2013
Priority date	Jan 15, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Provided are: an epoxy resin composition which enables the production of a carbon-fiber-reinforced composite material having excellent tensile strength and compressive strength and suitable as a material for structures; a prepreg; and a carbon-fiber-reinforced composite material. An epoxy resin composition characterized by comprising at least [A] an epoxy resin having a structure represented by formula (1), [B] an epoxy resin having at least one amine-type glycidyl group or at least one ether-type glycidyl group and having a liquid form at 40° C. and [C] a curing agent; and a prepreg and a carbon-fiber-reinforced composite material, each produced using the epoxy resin composition.

(In the formula, R 1 to R 4 independently represent at least one atom or group selected from the group consisting of a hydrogen atom, an aliphatic hydrocarbon group having 1 to 4 carbon atoms, an alicyclic hydrocarbon group having 4 or less carbon atoms, and a halogen atom.)

First claim

The invention claimed is:

1. An epoxy resin composition comprising at least the following components [A], [B], [C] and [D]:
[A] epoxy resin having a structure as represented by chemical formula (1) in an amount of 40 to 90 mass % based on 100 mass % of the epoxy resin in the epoxy resin composition,

wherein R 1 to R 4 represent at least one selected from the group consisting of a hydrogen atom, aliphatic hydrocarbon group containing 1 to 4 carbon atoms, alicyclic hydrocarbon group containing 4 or less carbon atoms, and halogen atom,
[B] epoxy resin having at least one amine type glycidyl group or ether type glycidyl group and being liquid at 40° C. in an amount of 10 to 60 mass % based on 100 mass % of the epoxy resin in the epoxy resin composition,
[C] curing agent, and
[D] thermoplastic resin soluble in epoxy resin.

2. An epoxy resin composition as described in claim 1 , wherein curing agent [C] is an aromatic amine curing agent.

3. An epoxy resin composition as described in claim 2 , wherein component [A] is tetraglycidyl diaminobenzanilide.

4. An epoxy resin composition as described in claim 2 , wherein curing agent [C] is diaminobenzanilide.

5. An epoxy resin composition as described in claim 1 , wherein component [A] is tetraglycidyl diaminobenzanilide.

6. An epoxy resin composition as described in claim 5 , wherein curing agent [C] is diaminobenzanilide.

7. An epoxy resin composition as described in claim 1 , wherein curing agent [C] is diaminobenzanilide.

8. An epoxy resin composition as described in claim 1 , wherein cured epoxy resin produced by the curing thereof at 180° C. for 2 hours has a flexural modulus of 4.5 GPa or more and 5.7 GPa or less and a rubber-state elastic modulus of 9.5 MPa or more and 23 MPa or less.

9. An epoxy resin composition as described in claim 1 further comprising thermoplastic resin particles [E].

10. An epoxy resin composition as described in claim 1 , wherein thermoplastic resin [D] is present in an amount of 1 to 40 parts by mass relative to 100 parts by mass of the epoxy resin.

11. Prepreg produced by impregnating carbon fiber with an epoxy resin composition as described in claim 1 .

12. Prepreg as described in claim 11 , wherein the carbon fiber has a tensile strength of 4.0 GPa to 7.5 GPa.

13. Carbon fiber reinforced composite material produced by curing prepreg as described in either claim 11 .

14. Carbon fiber reinforced composite material comprising cured resin produced by curing an epoxy resin composition as described in claim 1 and carbon fiber.

Assignees

• Toray Industries

Inventors

• Misumi Jun
• Arai Nobuyuki
• Taiko Hiroshi
• Ueno Shizue

Classifications

• C08G59/10

  of polyamines with epihalohydrins or precursors thereof · CPC title

• C08G59/28 Primary

  containing acyclic nitrogen atoms · CPC title

• C08L63/00

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

• C08G59/245

  aromatic · CPC title

• C08G59/226

  Mixtures of di-epoxy compounds · CPC title