▎ 摘　　要

NOVELTY - Modification of ultra-low temperature interface performance of carbon fiber/epoxy resin composite material involves depulping and acidifying the carbon fiber, obtaining acidified carbon fiber, using polyetherimide as connecting agent, to graft graphene oxide on the acidified carbon fiber to obtain graphene oxide modified carbon fiber, modifying the surface of the modified material with attapulgite to obtain modified composite of multi-level structure. The mass ratio of polyetherimide, graphene oxide and acidified carbon fiber is 0.15-0.25 g: 15-25 mg: 0.06-0.1 g. The mass ratio of modified attapulgite and graphene oxide modified carbon fiber is 5-15 mg:0.03-0.1 g. USE - Modification of ultra-low temperature interface performance of carbon fiber/epoxy resin composite material. ADVANTAGE - The modification method produces a bridge at the carbon fiber/epoxy resin interface and improves the ultra-low temperature interface shear strength of the carbon fiber and epoxy resin by generating a covalent bond and increasing mechanical meshing effect.