▎ 摘　　要

NOVELTY - Preparing graphene-containing plastic additive comprises (i) preparing graphite powder into graphene oxide by Hummers' method; (ii) dissolving the graphene oxide in dimethylformamide, ultrasonically dispersing for 20-25 minutes, adding styrene amide and initiator azobisisobutyronitrile, stirring for 10-15 minutes and reacting at 70-80 degrees C for 28-32 hours; (iii) subjecting the obtained step (ii) product to vacuum distillation, precipitating, dispersing, centrifuging and drying to obtain composite modified material; and (iv) melt-blending the composite modified material and polymethyl methacrylate by double-screw rod co-extruder, cooling, air-drying and granulating. USE - The method is useful for preparing graphene-containing plastic additive. ADVANTAGE - The plastic additive has good thermal conductivity and heat dissipation property and enhanced mechanical property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene-containing plastic additive, prepared by the above mentioned method.