▎ 摘　　要

NOVELTY - A composite heat-dissipating graphene material comprises 0.3 wt.% graphene and 99.7 wt.% plastic. USE - Composite heat-dissipating graphene material. ADVANTAGE - The preparation is simple and uses inexpensive graphite or expanded graphite as raw material to produce high purity graphene. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite heat-dissipating graphene material which involves adding 200 ml mixed acid of 98% concentrated sulfuric acid and 85% concentrated phosphoric acid in ratio of 180mL: 20mL to dry beaker, leaving still, adding 1.5 g graphite in a 500mL beaker and then slowly pouring mixed acid along the walls of graphite containing beaker, placing in magnetic stirring oil bath and heating at 50 degrees C, then adding 9 g potassium permanganate, covering the beaker with large filter paper to prevent impurities from falling into the beaker, and heating at 50 degrees C for 6 hours, continuously adding hydrogen peroxide diluted with water to the mixture under heating and stirring at 50 degrees C until color of the solution changes from black to purple and finally to bright yellow until no bubbles are generated, further heating and stirring at 50 degrees C for 3 hours, cooling to room temperature and subjecting to centrifugal washing treatment.