▎ 摘　　要

NOVELTY - Preparing graphene/polyurethane composite resin comprises (i) adding diethylene glycol, 1,4-butanediol, adipic acid and sebacic acid into a reaction container, adding a titanium-based catalyst, and slowly heating to 130-135 degrees C, with the system undergoing dehydration and condensation reaction, and gradually heating to 210-215 degrees C, and obtaining polyester polyol after the hydroxy value reaches the standard; (ii) adding polyester polyol, graphene oxide and methyl acetone into reaction container, stirring uniformly, adding isophorone diisocyanate and hexamethylene diisocyanate; (iii) adding hexamethylene diisocyanate, toluene diisocyanate and ethyl acetate in the flask, and adding trimethylolpropane, adding polyether polyol after 30 minutes, and controlling the temperature, preserving temperature and reacting for a period of time to obtain glue B; and (iv) blending graphene/polyurethane composite resin glue A, glue B and diluent in proportion and working concentration. USE - The method is useful for preparing graphene/polyurethane composite resin. ADVANTAGE - The graphene has a higher specific surface area, better flexibility and excellent corrosion resistance, thus is more conducive to improving the performance of the polyurethane resin. The method reduces the reinforcement effect, realizes the dispersibility of graphene in polyurethane, the interfacial effect and the binding property of the polyurethane group. The composite resin has excellent thermal stability and corrosion resistance. DETAILED DESCRIPTION - Preparing graphene/polyurethane composite resin comprises (i) adding diethylene glycol, 1,4-butanediol, adipic acid and sebacic acid into a reaction container, adding a titanium-based catalyst, and slowly heating to 130-135 degrees C, with the system undergoing dehydration and condensation reaction, and gradually heating to 210-215 degrees C, measuring the acid value after 5 hours of heat preservation, turning on the vertical condenser after the acid value reaches the standard, carrying out vacuum distillation for 2-3 hours to measure the hydroxy value, and obtaining polyester polyol after the hydroxy value reaches the standard; (ii) adding polyester polyol, graphene oxide and methyl acetone into reaction container, stirring uniformly, adding isophorone diisocyanate and hexamethylene diisocyanate, slowly heating, keeping for 12 hours, and adding ethyl acetate to dilute to obtain glue A; (iii) adding hexamethylene diisocyanate, toluene diisocyanate and ethyl acetate in the flask, and adding trimethylolpropane when the temperature reaches 45 degrees C with an exothermic reaction at this time, and controlling cooling, adding polyether polyol after 30 minutes, and controlling the temperature, preserving temperature and reacting for a period of time to obtain glue B; and (iv) blending graphene/polyurethane composite resin glue A, glue B and diluent in proportion and working concentration, where glue A is a graphene/polyester polyol composite modified resin, and B glue is a polyisocyanate compound.