EPOXY RESIN COMPOSITION, PREPREG AND FIBRE-REINFORCED COMPOSITE MATERIAL Russian patent published in 2020 - IPC C08G59/06 C08G59/10 C08G59/50 C08J5/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a prepreg, as well as to a fibre-reinforced composite material which can be used for production of aviation parts, automotive parts and industrial parts. Prepreg contains a composition of epoxy resin and reinforcing fibre. Epoxy resin composition contains component [A] tri- or more functional epoxy resin binaftalin type, component [B] diaminodiphenyl sulphone and component [F] bifunctional epoxy resin of general formula (F-1), presented below, in which the substituents R⁶ and R⁷ each independently represents at least one substitute selected from a group consisting of an aliphatic hydrocarbon group having 1 to 4 carbon atoms, alicyclic hydrocarbon group having 3 to 6 carbon atoms, an aromatic hydrocarbon group having 6 to 10 carbon atoms, a halogen atom, an acyl group, a trifluoromethyl group and a nitro group; n is integer from 0 to 4, and m is integer from 0 to 5; and Y denotes a group selected from -O-, -S-, -CO-, -C(=O)O-, -SO₂-. Fibre reinforced composite contains a cured prepreg and reinforcing fibre. Glass transition temperature of the cured product, which is obtained by curing the epoxy resin composition at 180 °C for 2 hours, after immersion in boiling water at 1 atm for 48 hours, is 180 °C or more.

EFFECT: invention increases heat resistance of composite material in conditions of moisture absorption.

11 cl, 10 tbl, 75 ex