▎ 摘　　要

NOVELTY - Graphene conductive coating comprises 2-5 pts. wt. surface carboxylated graphene, 120-160 pts. wt. polyester polyol, 50-80 pts. wt. diisocyanate, 0.5-1.5 pts. wt. catalyst and 200-260 pts. wt. diluent. The surface carboxylated graphene is prepared by preparing graphene oxide by hummers process, ultrasonically dispersing graphene oxide in dimethylformamide, adding sodium hydroxide and succinic acid peroxide, ultrasonically processing continuously, reacting at 75-90 degrees C for 2-3 hours, filtering, washing and drying to obtain a carboxylated graphite oxide, adding surfactant to the carboxylated graphite oxide, ultrasonically processing for 10-20 minutes, adding diazonium salt solution, adding 2-2.5 ml 35-38 wt.% concentrated hydrochloric acid at 0-4 degrees C, stirring for 8-10 hours, stirring at room temperature for 5-8 hours, washing, filtering and drying to obtain surface carboxylated graphene. USE - As graphene conductive coating. ADVANTAGE - The coating has highly increased binding force between the graphene and the polyurethane because of reaction between the isocyanate group and the carboxy group, enhanced dispersibility of graphene in the matrix material, and excellent strength, toughness and electrical conductivity. DETAILED DESCRIPTION - Graphene conductive coating comprises 2-5 pts. wt. surface carboxylated graphene, 120-160 pts. wt. polyester polyol, 50-80 pts. wt. diisocyanate, 0.5-1.5 pts. wt. catalyst, and 200-260 pts. wt. diluent. The surface carboxylated graphene is prepared by preparing graphene oxide by hummers process, ultrasonically dispersing graphene oxide in dimethylformamide, adding sodium hydroxide and succinic acid peroxide, ultrasonically processing continuously, reacting at 75-90 degrees C for 2-3 hours, filtering, washing and drying to obtain a carboxylated graphite oxide, where the ratio between graphene oxide, sodium hydroxide, succinic acid peroxide and dimethylformamide is 1:(10-13):(10-13):(15-20) mmol/ml, adding surfactant to the carboxylated graphite oxide, ultrasonically processing for 10-20 minutes, adding diazonium salt solution, adding 2-2.5 ml 35-38 wt.% concentrated hydrochloric acid at 0-4 degrees C, stirring for 8-10 hours, stirring at room temperature for 5-8 hours, washing, filtering and drying to obtain surface carboxylated graphene, where the ratio between the carboxylated graphite oxide and the diazonium salt solution is 1:(0.8-0.9) g/ml. An INDEPENDENT CLAIM is included for a method for preparing the coating involving (i) uniformly dispersing a metered portion of the diluent and the surface carboxylated graphene at a high speed, ball-milling for 90-200 minutes and ultrasonically processing for 90-200 minutes to obtain a stable carboxylated graphene dispersion, and (ii) adding a metered portion of the polyester polyol, diisocyanate and catalyst to the carboxylated graphene dispersion obtained in step (i), heating at 70-90 degrees C under a nitrogen atmosphere, stopping the reaction after reacting for 2-3.5 hours, and distilling under reduced pressure to the product.