▎ 摘　　要

NOVELTY - Multifunctional coating, comprises (1) adding the reduced graphene oxide to dimethylformamide and ultrasonically mixing for 1 hour, then pouring into a reaction container, and adding isophorone diisocyanate, and carrying out the reaction and obtaining the mixture by centrifugation, cleaning the mixture, and finally drying the cleaned product in a vacuum drying oven to obtain functionally reduced graphene oxide, (2) pouring isophorone diisocyanate into another reaction vessel, heating and reacting to obtain a polyurethane prepolymer, bottling, sealing, storing and cooling to room temperature, and (3) taking the polyurethane prepolymer and ethyl acetate and pouring them into a beaker, adding functional reduced graphene oxide, mixing and dispersing, and obtaining polyurethane prepolymer polymer mixed solution, dissolving to obtain chain extender antifouling agent mixture and adding ethyl acetate solvent to dilute, stirring to end the reaction to obtain the final product. USE - The multifunctional coating is useful in complex and variable marine environment. ADVANTAGE - The coating: has excellent bionic self-healing, anti-fouling and anti-corrosion effects; ensure the high self-healing ability, mechanical strength, high segment mobility, high mechanical performance. DETAILED DESCRIPTION - Multifunctional coating, comprises (1) adding the reduced graphene oxide to dimethylformamide and ultrasonically mixing for 1 hour, then pouring into a reaction container, and adding isophorone diisocyanate, and carrying out the reaction under a nitrogen atmosphere for 12 hours and obtaining the mixture by centrifugation, ultrasonically cleaning the mixture for 3 times with butyl acetate, and finally drying the cleaned product in a vacuum drying oven at 60°C for 24 hours to obtain functionally reduced graphene oxide, where 2 mg of reduced graphene oxide is added to 0.5-2 ml dimethylformamide and the mass ratio of reduced graphene oxide and isophorone diisocyanate is 1:(1-10), (2) pouring isophorone diisocyanate into another reaction vessel, heating to 50°C, and adding nitrogen, poly tetrahydrofuran ether glycol at a speed of 0.2 ml per second, after the dropwise addition, reacting at 50°C for 30 minutes, then raising the temperature to 80°C, continuing the reaction for 3 hours to obtain a polyurethane prepolymer, bottling, sealing, storing and cooling to room temperature, where the mass ratio of isophorone diisocyanate and polytetrahydrofuran ether glycol is 0.92:0.8-1.2 and the molecular weight of polytetrahydrofuran ether glycol is 850, and (3) taking the polyurethane prepolymer and ethyl acetate in a mass ratio of 1: (0.6-2) and pouring them into a beaker, adding functional reduced graphene oxide, mixing and ultrasonically dispersing for 1 hour, and obtaining polyurethane prepolymer polymer mixed solution, adding antifouling agent 2-methyl-4-isothiazolin-3-one and chain extender 2-hydroxyethyl disulfide to dimethylformamide and dissolving completely to obtain chain extender antifouling agent mixture, adding the mixed solution of chain extender and antifouling agent into the mixed solution of polyurethane prepolymer, and adding ethyl acetate solvent to dilute and the solute accounts for 20-50 wt.% of the solution, then stirring at 60°C for 2 hours to end the reaction to obtain the final product, where the mass ratio of functional reduction graphene oxide to polyurethane prepolymer is (0.05-0.15):1, the mass ratio of polyurethane prepolymer to chain extender 2-hydroxyethyl disulfide is (4.0-4.2):1, the antifouling agent 2-methyl-4-isothiazolin-3- ketone accounts for 0.1-10 wt.% of the polyurethane coating. The ratio of the total mass of 2-methyl-4-isothiazolin-3-ketone and 2-hydroxyethyl disulfide to the mass of dimethylformamide is 1:(0.5-1.5). An INDEPENDENT CLAIM is also included for a multifunctional coating prepared by the above-mentioned method.