▎ 摘　　要

NOVELTY - The preparation of graphene/polyamide composite material involves (A) preparing graphene oxide into high-concentration aqueous solution, ultrasonically dispersing, and adding reducing agent to the mixture, mixing, heating, adding aluminum potassium sulfate dodecahydrate and adjusting pH of the mixture to 10 using aqueous ammonia, (B) sealing the mixture and increasing the temperature to obtain graphene hydrogel containing aluminum source, (C) transferring the graphene hydrogel containing aluminum source to aqueous ammonia solution, placing in closed environment, heating and freeze-drying to obtain three-dimensional graphene sponge containing aluminum source, (D) mechanically pulverizing three-dimensional graphene sponge containing aluminum source and sintering to obtain three-dimensional alumina/graphene powder, (E) mixing three-dimensional alumina/graphene powder with polyamide and processing additive at high speed and carrying out melt extrusion in twin-screw extruder. USE - Preparation of graphene/polyamide composite material used for heat conductive electronic device (claimed). ADVANTAGE - The method enables preparation of graphene/polyamide composite material ensuring excellent thermal conductivity. DETAILED DESCRIPTION - The preparation of graphene/polyamide composite material involves (A) preparing graphene oxide into 2 mg/mL high-concentration aqueous solution, ultrasonically dispersing for 1 hour, and adding reducing agent to the mixture, mixing, heating at 35 degrees C, adding 25-30 %mass aluminum potassium sulfate dodecahydrate and adjusting pH of the mixture to 10 using aqueous ammonia, (B) sealing the mixture and increasing the temperature to obtain graphene hydrogel containing aluminum source, (C) transferring the graphene hydrogel containing aluminum source to aqueous ammonia solution, placing in closed environment, heating and freeze-drying to obtain three-dimensional graphene sponge containing aluminum source, (D) mechanically pulverizing three-dimensional graphene sponge containing aluminum source and sintering at high temperature to obtain three-dimensional alumina/graphene powder, (E) mixing three-dimensional alumina/graphene powder with polyamide and processing additive at high speed and carrying out melt extrusion in twin-screw extruder.