▎ 摘　　要

NOVELTY - Preparing a polyimide composite material involves dispersing graphene oxide and carbon nanotubes uniformly in water to obtain a blending dispersion of carbon nanotubes/graphene oxide, adding dopamine hydrochloride, adjusting the pH value to 7.5-10.5, and complet reacting until the reaction to obtain mixture product. The obtained mixture product is washing and drying to obtain polydopamine-modified carbon nanotube graphene. The polydopamine-modified carbon nanotube graphene, dianhydride and diamine is add to an aprotic polar solvent, and performing in-situ polymerization under nitrogen protection, stirring at 10-30 degrees C to obtain polydopamine as modified carbon nanotube graphene/polyamic acid precursor solution. The aprotic polar solvent is N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide or N-methylpyrrolidone. USE - Method for preparing a polyimide composite material. ADVANTAGE - The method enables to prepare a polyimide composite material, which has simple technique, green and safe, convenient for industrial production. DETAILED DESCRIPTION - The polydopamine-modified carbon nanotube graphene/polyamic acid precursor solution is formed into a desired form by casting, a mold or other composite material, and is cured at 40-100 degrees C, and then at 100 degrees and mixture is incubated at 450 degrees C for 1-4 hours to obtain a polyimide composite.