EPOXY RESIN COMPOSITIONS AND FIBER-REINFORCED COMPOSITE MATERIALS OBTAINED THEREFROM Russian patent published in 2020 - IPC C08G59/24 C08L63/00 C08J5/24 B32B27/38 

FIELD: production of composite materials.

SUBSTANCE: invention relates to a composition of epoxy resin intended for producing a composite material, a prepreg and a composite material reinforced with carbon fiber, which can be used in sports, aeronautical, space and various industrial fields. Epoxy resin composition contains components [A], [B], [C] and [D]. Component [A] is an aromatic epoxy resin containing two or more epoxy-functionalities. Component [B] is an amine curing agent of diaminodiphenyl sulphone. Component [D] is a cycloaliphatic epoxy resin of formula (I):

(I),

wherein Y is a single bond or a divalent moiety selected from a group comprising O, C(CH₃)₂, CH₂, an oxirane ring and having molecular weight less than 45 g/mol. Component [C] is a latent acid catalyst—an onium salt of formula (II):

(II).

Prepreg contains carbon fibers impregnated with said composition. Prepreg hardens the composite material reinforced with carbon fiber and contains the cured product.

EFFECT: invention enables to obtain a cured material obtained as a result of heating, which is characterized by high level of heat resistance and high strength properties.

17 cl, 2 tbl, 18 ex, 1 dwg