Epoxy resin composition, molding material for fiber-reinforced composite material, and fiber-reinforced composite material

Patent metadata

Field	Value
Publication number	US-11339243-B2
Application number	US-201917270153-A
Country	US
Kind code	B2
Filing date	Aug 21, 2019
Priority date	Sep 10, 2018
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

An epoxy resin composition contains components (A)-(C), and satisfies the expressions below: Component (A): an aliphatic epoxy resin having one hydroxyl group and two to three epoxy groups in one molecule; Component (B): an aliphatic epoxy resin having no hydroxyl group and three epoxy groups in one molecule; Component (C): a polyisocyanate compound; 0.125≤A/B≤3; and 0.2<(A+B)/T≤0.8 (A: parts by mass of component (A), B: parts by mass of component (B), and T: total parts by mass of the epoxy resins in the epoxy resin composition).

First claim

The invention claimed is:

1. An epoxy resin composition comprising components (A) to (C):
the component (A): an aliphatic epoxy resin having 1 hydroxyl group and 2 or more and 3 or less epoxy groups in a molecule;
the component (B): an aliphatic epoxy resin having 0 hydroxyl groups and 3 epoxy groups in a molecule; and
the component (C): a polyisocyanate compound,
the epoxy resin composition satisfying:
0.125≤ A/B≤ 3 and 0.2<( A+B )/ T≤ 0.8, wherein

A is parts by mass of the component (A), B is parts by mass of the component (B), and
T is total parts by mass of an epoxy resin in the epoxy resin composition.

2. The epoxy resin composition according to claim 1 , further comprising a component (D):
the component (D): an epoxy resin having 2 or more hydroxyl groups and 2 or more epoxy groups in a molecule,
the epoxy resin composition satisfying:
0.1≤ D/B≤ 2, wherein

D is parts by mass of the component (D).

3. The epoxy resin composition according to claim 2 , wherein the component (D) is an aliphatic epoxy resin.

4. The epoxy resin composition according to claim 2 , wherein a total carbon number in a molecule of the epoxy resin as the component (D) is 20 or more and 50 or less.

5. The epoxy resin composition according to claim 1 , wherein the component (B) is an aliphatic epoxy resin represented by general formula (1):

wherein R 1 represents H or an aliphatic chain having a carbon number of 1 or more and 6 or less, and optionally contains a cyclic structure and/or a heteroatom, and R 2 represents O or an aliphatic chain having a carbon number of 1 or more and 6 or less, and optionally contains a cyclic structure and/or a heteroatom.

6. The epoxy resin composition according to claim 1 , wherein the component (C) satisfies:
1≤ I/W≤ 2, wherein

I is a number of isocyanate groups of the component (C) in the epoxy resin composition, and W is a total number of hydroxyl groups in the epoxy resin in the epoxy resin composition.

7. The epoxy resin composition according to claim 1 , wherein a cured resin of the epoxy resin composition has a glass transition temperature of 120° C. or more.

8. A molding material for a fiber-reinforced composite material, the molding material comprising the epoxy resin composition according to claim 1 and a reinforcing fiber.

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

10. The fiber-reinforced composite material according to claim 9 , wherein the reinforcing fiber is a carbon fiber.

Assignees

• Toray Industries

Inventors

• Ishikawa Norikazu
• Hondo Kazunori
• Tomioka Nobuyuki

Classifications

• C08J5/249

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

• C08J5/243

  using carbon fibres · CPC title

• C08G18/581 Primary

  Reaction products of epoxy resins with less than equivalent amounts of compounds containing active hydrogen added before or during the reaction with the isocyanate component (with amines C08G18/584) · CPC title

• C08G18/58 Primary

  Epoxy resins {(C08G18/42, C08G18/48 take precedence; reaction products of epoxy resins with at least equivalent amounts of compounds containing active hydrogen C08G18/6407, with at least equivalent amounts of amines C08G18/6415; polymeric products of isocyanates or isothiocyanates with epoxy compounds having no active hydrogen C08G18/003)} · CPC title

• C08G18/73

  acyclic · CPC title