Epoxy resin composition, prepreg, fiber-reinforced composite material, and method for producing same

Patent metadata

Field	Value
Publication number	US-2020165378-A1
Application number	US-201816611351-A
Country	US
Kind code	A1
Filing date	Apr 5, 2018
Priority date	May 10, 2017
Publication date	May 28, 2020
Grant date	—

Abstract

Provided is a fiber-reinforced composite material exhibiting high heat resistance and excellent appearance quality. is the composite material is based on an epoxy resin composition which contains constituents [A], [B], and [C] and satisfies conditions (i) and (ii):
[A] a tri- or higher functional epoxy resin; [B] an aromatic amine; [C] an imidazole compound;

0.20≤ b/a ≤0.60; and  (i)

0.002≤ c/a ≤0.014;  (ii)

wherein a (mol) denotes the number of epoxy groups in 100 g of the epoxy resin composition, b (mol) denotes the number of active hydrogens contained in the constituent [B], and c (mol) denotes the number of imidazole rings contained in the constituent [C]).

First claim

1 . An epoxy resin composition comprising constituents [A], [B], and [C] below, and satisfying conditions (i) and (ii):
[A] a tri- or higher functional epoxy resin; [B] an aromatic amine; [C] an imidazole compound;
0.20≤ b/a≤ 0.60; and  (i)

0.002≤ c/a≤ 0.014;  (ii)

wherein a (mol) denotes a number of epoxy groups in 100 g of the epoxy resin composition, b (mol) denotes a number of active hydrogens contained in the constituent [B], and c (mol) denotes a number of imidazole rings contained in the constituent [C]).

2 . The epoxy resin composition according to claim 1 , wherein the constituent [A] is contained in an amount of 60 to 100 parts by mass in 100 parts by mass of all epoxy resins.

3 . The epoxy resin composition according to claim 1 , wherein [A1] a tetrakis(hydroxyphenyl)ethane epoxy resin is contained as the constituent [A].

4 . The epoxy resin composition according to claim 3 , wherein the constituent [A1] is contained in an amount of 10 to 50 parts by mass in 100 parts by mass of all epoxy resins.

5 . The epoxy resin composition according to claim 1 , wherein [C1] a reaction product of an imidazole compound and a bisphenol epoxy resin is contained as the constituent [C].

6 . The epoxy resin composition according to claim 1 , wherein a glass transition temperature of a cured resin produced by subjecting the epoxy resin composition to primary curing at 180° C. for 30 minutes and then to secondary curing at 240° C. for 30 minutes is 220° C. or more.

7 . A prepreg comprising the epoxy resin composition according to claim 1 and a reinforced fiber.

8 . A fiber-reinforced composite material comprising the prepreg according to claim 7 in cured form.

9 . A method for producing a fiber-reinforced composite material, comprising subjecting the prepreg according to claim 7 to primary curing at 130° C. to 200° C. and then to secondary curing at 210° C. to 270° C. for 10 minutes or more.

Assignees

• Toray Industries

Inventors

• Sano Kentaro
• Kuroda Taiki
• Mori Ayumi
• Kamae Toshiya

Classifications

• C08G59/5073 Primary

  having two nitrogen atoms in the ring · CPC title

• C08J2363/00

  Characterised by the use of epoxy resins; Derivatives of epoxy resins · CPC title

• C08G59/3218 Primary

  Carbocyclic compounds · CPC title

• C08L63/00

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

• C08G59/245

  aromatic · CPC title