▎ 摘　　要

NOVELTY - Multifunctional polyurea elastomer composite material based on graphene nanosheets comprises graphene nanosheets and polyurea elastomer, where the graphene nanosheets and the polyurea elastomer are connected by chemical bonds, and the graphene nanosheets are uniformly dispersed in the polyurea elastomer, and the graphene nanosheets account for 0.1-10 wt.% of the polyurea elastomer by mass. USE - Multifunctional polyurea elastomer composite material based on graphene nanosheets. ADVANTAGE - The multifunctional polyurea elastomer composite material based on graphene nanosheets improve the mechanical properties and impact resistance of the polyurea material, and make the polyurea elastomer material have multiple properties of electrical conductivity, heat conduction and sensing. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene nanosheet-based multifunctional polyurea elastomer composite material, which comprises (A) preparing graphene nanosheets and placing expandable graphene, keeping it in a crucible at 680-700 degrees C for 1 to 2 minutes, and after expansion, placing in an acetone solution for ultrasonic peeling, and during the ultrasonic process, maintaining the temperature below 20 degrees C to remove the acetone to obtain graphene nanosheets; (B) crushing and mixing the amino-terminated polyether and graphene nanosheets to obtain a mixture, where according to the solid-liquid ratio, graphene nanosheets: amino-terminated polyether is 0.1g:(2-3)mL; (C) mixing the mixture with the solvent, ultrasonically treating for 10-20min, then placing at 80-100 degrees C to react for 3-5h, cooling to room temperature, using solvent to clean and removing impurities, and vacuum drying to obtain amino-modified graphene nano piece; (D) preparing isocyanate prepolymer, dissolving the aliphatic diisocyanate in a solvent, and then adding amino-modified graphene nanosheets, controlling the temperature to 0-10 degrees C, adding the dehydrated amino-terminated polyether dropwise, after the dropwise addition is complete, stirring the reaction below 10 degrees C for 2-3h, then transferring to 80-85 degrees C heating reaction for 3 to 5 hours to obtain an isocyanate prepolymer; and (E) adding liquid amine chain extender to the isocyanate prepolymer, stirring, transferring to a mold, and curing in an oven to obtain graphene nanosheet-based multifunctional polyurea elastomer composite material.