▎ 摘　　要

NOVELTY - A composite polyimide film comprises 150-300 pts. wt. polyimide resin polymer comprising 0.2-1.5 wt.% graphene, 1-5 wt.% titanium dioxide, 0.5-6 wt.% silica sol, 2-10 wt.% fluoroacrylate copolymer and balance amount of polyimide resin, 1-2 pts. wt. fullerene, 0.1-0.2 pt. wt. rare earth oxide and 2.5-3.5 pts. wt. modifier. USE - Composite polyimide film. ADVANTAGE - The composite polyimide film has improved mechanical properties, tensile strength of more than 200 MPa, smoothness and volume resistivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite polyimide film, which involves mixing raw materials, stirring, ultrasonically-processing for 20-30 minutes, crushing, heating at 45-50 degrees C for 30 minutes and cooling to room temperature.