▎ 摘　　要

NOVELTY - Method for preparing high temperature resistant polyimide enamelled wire paint comprises (i) (ia) ultrasonically crushing the graphene oxide for 2-3 hours, processing the graphene oxide into nano-graphene oxide by the ultrasonic probe, removing the large-size graphene oxide by the filter membrane, dispersing the nano-graphene oxide in dimethylformamide ultrasonically and adding sodium hydroxide and citric acid to continue ultrasonication, and (ib) adding carboxylated nano-graphene oxide into the reactor, adding gamma -aminopropyl silsesquioxane, and stirring at 70-90 degrees C for 4-6 hours to obtain carboxylated silsesquioxane grafted mano-graphene oxide, i.e., the surface-modified nano-graphene oxide; and (ii) placing surface-modified nano-graphene oxide in the reactor, adding a solvent, heating, adding an specific amount of diamine and dianhydride, heating to 120-140 degrees C, cooling the material to 60-80 degrees C, adding the diluent and the film-forming assistant, and stirring. USE - The method is useful for preparing high temperature resistant polyimide enamelled wire paint. ADVANTAGE - The method is simple and greatly improves the heat resistance and mechanical strength of polyester wire enamel. DETAILED DESCRIPTION - Method for preparing high temperature resistant polyimide enamelled wire paint comprises (i) (ia) ultrasonically crushing the graphene oxide for 2-3 hours, processing the graphene oxide into nano-graphene oxide by the ultrasonic probe, removing the large-size graphene oxide by the filter membrane, dispersing the nano-graphene oxide in dimethylformamide ultrasonically and adding sodium hydroxide and citric acid to continue ultrasonication, reacting at 60-85 degrees C for 2-3 hours, subjecting the obtained product to suction filtration, washing, and drying in an oven to obtain carboxylated nano-graphene oxide, and (ib) adding carboxylated nano-graphene oxide into the reactor, adding gamma -aminopropyl silsesquioxane, and stirring at 70-90 degrees C for 4-6 hours to obtain carboxylated silsesquioxane grafted mano-graphene oxide, i.e., the surface-modified nano-graphene oxide, where the molar ratio of gamma -aminopropyl silsesquioxane to carboxylated nano-graphene oxide is 1:(0.2-0.6); and (ii) placing surface-modified nano-graphene oxide in the reactor, adding a solvent, heating to 80-90 degrees C, adding an specific amount of diamine and dianhydride, heating to 120-140 degrees C, reacting for 6-12 hours, cooling the material to 60-80 degrees C, adding the diluent and the film-forming assistant, and stirring.