▎ 摘　　要

NOVELTY - Heat-conducting polymer film comprises 30-80 pts. wt. polymer matrix, 5-40 pts. wt. uniformly dispersed and highly oriented graphene, 10-30 pts. wt. second heat conducting filler, 0.015-4 pts. wt. surface processing agent, 1-40 pts. wt. filling agent and 0.5-20 pts. wt. processing auxiliary agent. USE - Used as heat-conducting polymer film. ADVANTAGE - The film: promotes the uniform dispersion of graphene nanosheets and other heat conducting filler; has high degree of orientation; utilizes graphene to construct long-range, continuous, three-dimensional hybrid thermal network structure; overcomes anisotropy of graphene; and builds a stable and effective heat conduction network. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the heat-conducting polymer film comprising (1) carrying out high-shear melt blending at 120-300 degrees C of polymer, graphene, second heat conducting filler, surface processing agent, coating agent and processing aid at high shear strength, where the ratio of the output energy of blending process to the mass of all the mixtures is 0.1-5 kWh/kg, cooling and pelletizing or directly pelletizing to obtain uniformly dispersed graphene-filled modified polymer and (2) subjecting the uniformly dispersed graphene-filled modified polymer to high mechanical stretching at 160-300 degrees C at a stretch ratio 2-200 and obtaining a heat-conducting polymer film containing uniformly dispersed and highly oriented graphene having 10-800 mu m thickness.