▎ 摘　　要

NOVELTY - Preparing polyimide composite film comprises (a) preparing silicon dioxide/graphene glue solution, where the kinematic viscosity of the glue at 25 degrees C is 0.005-0.03 cm2/second, and the mass fraction of graphene oxide is 1-5 wt.%, (b) carrying out surface modification of pure polyimide film with alkali, and (c) coating the silicon dioxide/graphene glue solution on the pure polyimide film by pulling method after the surface modification treatment, then sequentially performing sealing aging and heat treatment molding to form silicon dioxide/graphene coating to obtain polyimide composite film. USE - The method is useful for preparing polyimide composite film. ADVANTAGE - The method: can tightly combine inorganic coating with organic matrix; and can uniformly disperse inorganic particles. The film: has better mechanical properties, and has excellent wear resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for polyimide composite film prepared by the above method, where the thickness of silicon dioxide/graphene coating is 0.5-5 mu m.