▎ 摘　　要

NOVELTY - Preparation of composite material involves dispersing graphene oxide in dimethyl formamide solution, adding diisocyanate, reacting to obtain a reaction solution, pouring the reaction solution into methylene chloride to obtain a turbid solution and centrifuging the turbid liquid to obtain modified graphene oxide, adding selenium powder to the aqueous solution of sodium borohydride, heating to obtain an aqueous solution of sodium selenide, adding the aqueous solution of sodium selenide to 11-bromo-1-undecyl alcohol solution, heating to obtain a light yellow solid and purifying the light yellow solid to obtain hydroxyl-terminated diselenide monomer, adding the diisocyanate solution to dihydric alcohol solution, dripping the hydroxyl-terminated diselenide monomer to obtain a polyurethane product, and dissolving the modified graphene oxide in dimethyl formamide solution, adding to the solution of the polyurethane product, stirring, transferring the mixed liquid to the mold, and heating. USE - Preparation of composite material (claimed) used for aerospace and automotive industry applications. ADVANTAGE - The method is efficient and convenient, realizes the self-healing ability of the material, uses modified graphene oxide having excellent photothermal properties, and produces composite material which converts light energy into heat when irradiated by a remote infrared laser. DETAILED DESCRIPTION - Preparation of composite material with photothermal self-healing function involves (i) dispersing graphene oxide in dimethyl formamide solution under an inert gas atmosphere, adding diisocyanate, stirring and reacting at room temperature to obtain a reaction solution, and pouring the reaction solution into methylene chloride to obtain a turbid solution, and centrifuging the turbid liquid to obtain modified graphene oxide, (ii) adding selenium powder to the aqueous solution of sodium borohydride in an ice bath environment, mixing and stirring, raising the temperature to 70-80 degrees C, and heating to obtain an aqueous solution of sodium selenide, (iii) adding the aqueous solution of sodium selenide to 11-bromo-1-undecyl alcohol solution under an inert gas atmosphere, heating the reaction to 40-60 degrees C to obtain a light yellow solid, and purifying the light yellow solid to obtain a yellow powder, which is a hydroxyl-terminated diselenide monomer, (iv) slowly adding the diisocyanate solution to dihydric alcohol solution under an inert gas atmosphere, heating and reacting for a period of time, and dripping the hydroxyl-terminated diselenide monomer to continue the reaction to obtain a polyurethane product, and (v) dissolving the modified graphene oxide in dimethyl formamide solution under an inert gas atmosphere, adding to the solution of the polyurethane product, heating and stirring, ultrasonically processing, transferring the mixed liquid to the mold, and heating.