Prepreg and fiber-reinforced composite material

Patent metadata

Field	Value
Publication number	US-2021371613-A1
Application number	US-201916980988-A
Country	US
Kind code	A1
Filing date	Feb 27, 2019
Priority date	Mar 20, 2018
Publication date	Dec 2, 2021
Grant date	—

Abstract

A prepreg having excellent tackiness as well as excellent resin strength after curing and strength in the non-fiber direction is described; and a fiber-reinforced composite material using the prepreg, where the prepreg is composed of reinforcing fibers and a resin composition which includes [A] an epoxy resin, [B] a dicyanamide and [C] a compound having a melting point of 130° C. or lower and a solubility parameter whose difference from the solubility parameter of [B] is 8 or less.

First claim

1 . A prepreg composed of reinforcing fibers and a resin composition,
wherein the resin composition comprises the following [A] to [C]: [A]: an epoxy resin; [B]: a dicyandiamide; and [C]: a compound which has a melting point of 130° C. or lower and a solubility parameter whose difference from the solubility parameter of [B] is 8 or less, and which is selected from ethers, amides, sulfoxides and imides; wherein the resin composition comprises from 30 to 250 parts by mass of [C] with respect to 100 parts by mass of [B], and wherein the resin composition has a viscosity at 25° C. of 1,000 Pa·s or more.

2 . The prepreg according to claim 1 , wherein the resin composition comprises from 1 to 10 parts by mass of the component [C] with respect to 100 parts by mass of the component [A].

3 . The prepreg according to claim 1 , wherein all the compounds as the component [C] contained in the resin composition have a boiling point of 125° C. or higher.

4 . The prepreg according to claim 1 , wherein the component [A] has an average epoxy equivalent of from 115 to 200 g/eq.

5 . The prepreg according to claim 1 , wherein 100 parts by mass of the component [A] comprises from 40 to 90 parts by mass of an epoxy resin having three or more functional groups and containing a nitrogen atom within the molecule.

6 . A fiber-reinforced composite material obtained by curing the prepreg according to claim 1 .

Assignees

• Toray Industries

Inventors

• Furukawa Koji
• Kawasaki Junko
• Yoshizaki Soichi
• Sano Kentaro
• Kamae Toshiya

Classifications

• C08G59/3227 Primary

  Compounds containing acyclic nitrogen atoms · CPC title

• C08J5/243 Primary

  using carbon fibres · CPC title

• C08J5/249

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

• C08G59/245 Primary

  aromatic · CPC title

• C08G59/4021

  Ureas; Thioureas; Guanidines; Dicyandiamides · CPC title