▎ 摘　　要

NOVELTY - Preparing graphene and polyolefin composite material comprises dispersing the graphene oxide in solvent, to obtain suspension liquid, where the concentration of the suspension liquid is 0.1-10 mg/ml, reacting the suspension at 100-200 degrees C for 12-24 hours, to obtain a foamed graphene precursor, dissolving the foamed graphene precursor in water, freeze-drying at -80 to -10 degrees C, under inert atmosphere at 700-1200 degrees C, roasting for 1-3 hours, to obtain foamed graphene, soaking foamed graphene in a polyolefin solution, evaporating to dryness, to obtain composite material of graphene and polyolefin. USE - The method is useful for preparing graphene and polyolefin composite material (claimed). ADVANTAGE - The material is cheap. The method is produced in large scale. DETAILED DESCRIPTION - Preparing graphene and polyolefin composite material comprises dispersing the graphene oxide in the solvent, to obtain the suspension liquid, where the concentration of the suspension liquid is 0.1-10 mg/ml, reacting the suspension at 100-200 degrees C for 12-24 hours, to obtain a foamed graphene precursor, dissolving the foamed graphene precursor in water, freeze-drying at -80 to -10 degrees C, under an inert atmosphere at 700-1200 degrees C, roasting for 1-3 hours, to obtain a foamed graphene, soaking the foamed graphene in a polyolefin solution, evaporating to dryness, to obtain a composite material of graphene and polyolefin, where the proportion of the foamed graphene in the composite material of the graphene and the polyolefin is 0.01-20 wt.%, and the proportion of polyolefin in the composite material of graphene and polyolefin is 80-99.99 wt.%.