▎ 摘　　要

NOVELTY - Method for preparing polyethylenimine composite material, involves (i) mixing graphene and nano-silicon carbide fine powder, adding surfactant, and grinding to obtain a nano-carbon material complex, (ii) dispersing the nano-carbon material complex ligand by ultrasonic vibration dispersion in N,N-dimethylformamide, adding p-phenylenediamine and bisphenol A type diether dianhydride, stirring at high speed, and polymerizing to obtain viscous prepolymer polyamic acid, and (iii) adding acetic anhydride to the prepolymer polyamic acid through imidization, stirring, precipitating, carrying out suction filtration and drying. USE - The method is useful for preparing polyethylenimine composite material. ADVANTAGE - The composite material has excellent abrasion resistance, light weight, high strength and high impact resistance.