▎ 摘　　要

NOVELTY - Preparing polyaniline modified graphene oxide/hydroxylated boron nitride composite epoxy coating comprises e.g. (1) taking thionyl chloride and graphene oxide, mixing and ultrasonically processing to prepare dispersion liquid, refluxing dispersion liquid and distilling under reduced pressure to obtain acyl chloride graphene, adding acyl chloride graphene and para-phenylenediamine into an organic solvent to disperse evenly, refluxing under the protection of nitrogen and performing vacuum distillation, centrifuging, and freezing-drying to obtain amino-modified graphene rGO-NH2 powder; (2) adding the amino-modified graphene powder and aniline to the hydrochloric acid solution for ultrasonic dispersion, slowly dropwise adding the solution containing the initiator to aniline/amino modified graphene hydrochloric acid solution for polymerization, obtaining polyaniline-modified graphene solution, washing with water, centrifuging, and drying to obtain polyaniline-modified graphene PrGO powder. USE - The method is useful for preparing polyaniline modified graphene oxide/hydroxylated boron nitride composite epoxy coating. ADVANTAGE - The composite epoxy coating: has greatly improved anti-corrosion performance, gloss and adhesion force. DETAILED DESCRIPTION - Preparing polyaniline modified graphene oxide/hydroxylated boron nitride composite epoxy coating comprises (1) taking thionyl chloride and graphene oxide, mixing and ultrasonically processing to prepare a dispersion liquid, refluxing the dispersion liquid and distilling under reduced pressure to obtain acyl chloride graphene, adding the acyl chloride graphene and para-phenylenediamine into an organic solvent to disperse evenly, refluxing under the protection of nitrogen and performing vacuum distillation, centrifuging, and freezing-drying to obtain amino-modified graphene rGO-NH2 powder; (2) adding the amino-modified graphene powder and aniline to the hydrochloric acid solution for ultrasonic dispersion, slowly dropwise adding the solution containing the initiator to aniline/amino modified graphene hydrochloric acid solution for polymerization, obtaining a polyaniline-modified graphene solution, washing with water, centrifuging, and drying to obtain polyaniline-modified graphene PrGO powder; (3) placing the urea in muffle furnace for heating and heat preservation, cooling to room temperature to obtain g-carbon nitride powder, dissolve g-carbon nitride powder and boric acid in deionized water, carrying ultrasonic treatment, heating under protection of nitrogen and continuously calcining to obtain hydroxylated boron nitride BN(OH)x; (4) dissolving PrGO powder and BN(OH)x in organic solvent, dropwise adding aqueous ammonia to adjust the pH of the solution, heating and keep stirring, filtering the solution of black product, washing with water, centrifuging and freeze-drying to obtain a BN(OH)x-PrGO mixture; (5) taking the BN(OH)x-PrGO mixture obtained in the step (4) and dissolving in 1-methyl-2-pyrrolidone solution for ultrasonic dispersion, adding it to epoxy resin and stirring evenly, adding glycidyl methacrylate, propylene glycol methyl ether acetate, cardanol modified curing agent and leveling agent, and stirring evenly at high speed to obtain BN(OH)x-PrGO/epoxy resin slurry; and (6) using a coater to coat the prepared BN(OH)x-PrGO/epoxy resin slurry on the surface of the treated tinplate sheet, curing in vacuum drying oven to obtain BN(OH)x-PrGO composite epoxy anticorrosive coating.