▎ 摘　　要

NOVELTY - Graphene is heated in air or inert gas and ground-reacted with a transitional metal compound in inert gas, to obtain a solid catalyst. Nitrogen is pumped into a container for displacing air, ethylene-substitution is carried out, and an ionic liquid is added to the container. The solid catalyst and an organoaluminum compound are added to the ionic liquid. Ethylene is supplied and polymerization is carried out. The polymerization product is separated and dried to obtain off-white powder of ultrahigh molecular weight polyethylene graphene material. USE - Preparation of ultrahigh molecular weight polyethylene graphene material by ionic-liquid-assisted polymerization (claimed). ADVANTAGE - The method improves polymerization activity by catalyst loading, and product strength. Since the catalyst is prepared by grinding reaction between graphene and transition metal compound, graphene is uniformly distributed in the polymerization product. The overall performance, particularly impact resistance, of the product is improved. DETAILED DESCRIPTION - Commercially available graphene is heated in air or inert gas at 110-300 degrees C for 6-10 hours and ground-reacted with a transitional metal compound under inert gas protection for 2-10 hours, to obtain a solid catalyst containing 63-95 wt.% graphene. Nitrogen is pumped into a container for displacing air, ethylene-substitution is carried out, and an ionic liquid is added to the container. The solid catalyst and an organoaluminum compound are added to the ionic liquid which serves as a solvent. Ethylene is supplied to the container at 0.01-1 MPa and polymerization is carried out at 40-90 degrees C. Ethanol is added to terminate the reaction after 2-10 hours. The polymerization product is separated from the inert hydrocarbon diluent and dried to obtain off-white powder of ultrahigh molecular weight polyethylene graphene material. The molar ratio of aluminum in the organoaluminum compound and transition metal in the catalyst is 10-100:1.