▎ 摘　　要

NOVELTY - Composite film comprises substrate film composed of graphene, high molecular polymer and curing agent and a coating layer coated on the surface of substrate film. USE - Used as composite film. ADVANTAGE - The composite film: has excellent heat dissipation; good electromagnetic shielding effectiveness; and simple structure and low cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the preparation of composite film comprising (1) adding dispersing agent and grinding agent, dissolving in organic solvent to obtain a mixed solution, (2) adding graphite raw material to mixed solution to obtain a graphene dispersion, (3) mixing high molecular polymer and curing agent into graphene dispersion to obtain coating liquid and (4) coating the coating liquid on the surface of substrate film and subjecting to curing treatment to obtain composite film.