▎ 摘　　要

NOVELTY - Water-based graphene polyurethane coating comprises component A and component B. The A component includes polyurethane emulsion, wetting agent, defoamer, thickening agent, and diluent, and the B component is a curing agent. The preparation method of the polyurethane emulsion is adding diisocyanate, polyester diol and hydrophilic chain extender into the reactor, turning on the stirring for reaction, controlling the temperature of the reactor at 60-65 degrees C, adding acetone for dilution, adding alcohol and modified graphene to react, and controlling the reaction temperature at 75-85 degrees C, reacting for 1-3 hours, controlling the reaction, adding neutralizer, and stirring uniformly, adding water under high-speed shearing conditions to obtain polyurethane dispersion after emulsification and dispersion, adding reactor is added to a condensing reflux device, an initiator is added to carry out a polymerization reaction, distilling acetone is distilled off under reduced pressure. USE - Used as water-based graphene polyurethane coating. ADVANTAGE - The coating has excellent comprehensive properties. DETAILED DESCRIPTION - Water-based graphene polyurethane coating comprises component A and component B. The A component includes polyurethane emulsion, wetting agent, defoamer, thickening agent, and diluent, and the B component is a curing agent. The preparation method of the polyurethane emulsion is adding diisocyanate, polyester diol and hydrophilic chain extender into the reactor, turning on the stirring for reaction, controlling the reaction temperature at 75-85 degrees C, and reacting for 2-3 hours, controlling the temperature of the reactor at 60-65 degrees C, adding acetone for dilution, adding alcohol and modified graphene to react, and controlling the reaction temperature at 75-85 degrees C, reacting for 1-3 hours, controlling the reaction, heating reactor at 50-60 degrees C, adding hydroxyethyl methacrylate and methyl methacrylate to the reactor, stirring uniformly, controlling the temperature of the reactor at 30-40 degrees C, adding neutralizer, and stirring uniformly, adding water under high-speed shearing conditions to obtain polyurethane dispersion after emulsification and dispersion, adding reactor is added to a condensing reflux device, an initiator is added to carry out a polymerization reaction, distilling acetone is distilled off under reduced pressure to obtain the polyurethane emulsion and the preparation method of the modified graphene comprises (a) adding graphene oxide, thionyl chloride, and benzene to the reactor, turning on the stirring and condensing reflux device, controlling the temperature of the reactor to 65-75 degrees C, reacting for 20-25 hours, washing with anhydrous tetrahydrofuran and drying to obtain chlorinated graphene; and (b) adding the chlorinated graphene, hydroxyethyl methacrylate, and toluene into the reactor under an inert gas atmosphere, turning on the stirring and condensing reflux device, controlling the temperature of the reactor to 30-35 degrees C, slowly adding dropwise Triethylamine, reacting for 20-25 hours, adding diethylene glycol dropwise, and after reacting for 20-25 hours, washing with an organic solvent and drying to obtain the modified graphene. An INDEPENDENT CLAIM is also included for preparing the coating comprising mixing component A with the component B to obtain the coating.