▎ 摘　　要

NOVELTY - Preparation of graphene and polymer conductive composite material involves mixing graphite powder, sodium nitrate, concentrated sulfuric acid and potassium permanganate, obtaining mixed solution, adding deionized water, heating, filtering, drying, obtaining oxidized graphite, putting the graphite oxide in deionized water, ultrasonic dispersing, adding polyvinylidene fluoride powder, mechanical stirring, coating obtained product on surface of polyvinylidene fluoride powder particles, drying, and air cooling to room temperature. USE - Preparation of graphene and polymer conductive composite material (claimed). ADVANTAGE - The method enables economical and environmentally-friendly preparation of graphene and polymer conductive composite material having high electric conductive performance by a simple process, with low content of electroconductive filler. DETAILED DESCRIPTION - Preparation of graphene and polymer conductive composite material involves mixing 2-3 g graphite powder, 1-1.5 g sodium nitrate, 350-375 ml concentrated sulfuric acid and 10-12 g potassium permanganate, stirring, obtaining mixed solution, maintaining temperature to less than cooling temperature of 20 degrees C, slowly adding into water bath at 35 degrees C, continuously stirring for 30 minutes, adding 250-375 ml deionized water, heating to 97 degrees C, stirring for 30 minutes, adding deionized water and 30% hydrogen peroxide,terminating reaction, filtering the mixed solution of hydrochloric acid aqueous solution with concentration of 5%, and water, drying, obtaining oxidized graphite, putting the graphite oxide in deionized water, ultrasonic dispersing for 3 hours, obtaining uniformly dispersed graphene oxide aqueous solution with concentration of 0.1 mg/ml, adding 2 g polyvinylidene fluoride powder into 27-330 ml graphene oxide aqueous solution, mechanical stirring at 80 degrees C, evaporating, coating obtained product on surface of polyvinylidene fluoride powder particles, drying in vacuum at 80 degrees C for 24 hours, providing under protection of inert gases, mold pressing at 200 degrees C for 2 hours, taking out, and air cooling to room temperature.