▎ 摘　　要

NOVELTY - Preparation of nitrogen, phosphorus and fluorine co-doped graphene oxide/polyester resin composite involves adding graphite oxide into a beaker, pouring organic solvent, ultrasonically-treating at room temperature for 2-4 hours, adding catalyst and hydroxylated ionic liquid, ultrasonically-treating at room temperature for 2-4 hours to obtain a suspension, pouring the obtained suspension into a hydrothermal reactor, reacting at 50-60 degrees C for 8-12 hours, washing and filtering to obtain nitrogen, phosphorus and fluorine co-doped graphene oxide, adding the co-doped graphene oxide into N,N-dimethylformamide to make 1 g/10 ml solution, and ultrasonically-treating for 1 hour. The mass ratio of graphite oxide, hydroxylated ionic liquid, and catalyst is (1-5):(0.5-5):(0.01-0.04), and the amount of organic solvent added is 250-400 ml. USE - Nitrogen, phosphorus and fluorine co-doped graphene oxide/polyester resin composite used for flame retardant coating resins (claimed). ADVANTAGE - The nitrogen, phosphorus and fluorine co-doped graphene oxide/polyester resin composite has excellent strength, flame retardance, antibacterial properties and mechanical properties, and high limiting oxygen index. DETAILED DESCRIPTION - Preparation of a nitrogen, phosphorus and fluorine co-doped graphene oxide/polyester resin composite involves adding graphite oxide into a beaker, pouring organic solvent, ultrasonically-treating at room temperature for 2-4 hours, adding catalyst and hydroxylated ionic liquid, ultrasonically-treating again at room temperature for 2-4 hours to obtain a suspension, pouring the obtained suspension into a hydrothermal reactor, reacting at 50-60 degrees C for 8-12 hours, washing and filtering to obtain nitrogen, phosphorus and fluorine co-doped graphene oxide, adding the co-doped graphene oxide into N,N-dimethylformamide to make a 1 g/10 ml solution, and ultrasonically-treating for 1 hour. The mass ratio of graphite oxide, hydroxylated ionic liquid, and catalyst is (1-5):(0.5-5):(0.01-0.04), and the amount of organic solvent added is 250-400 ml. The organic solvent is chosen from toluene, tetrahydrofuran, N,N-dimethylformamide, N-methylpyrrolidone, cetyltrimethylammonium bromide surfactant solution and dimethyl sulfoxide. The catalyst is chosen from 2-picoline and N,N-dimethyl-4-pyridylamine. The hydroxylated ionic liquid is chosen from 1,2-dimethyl-3-hydroxyethylimidazolium p-toluenesulfonate, 1,2-dimethyl-3-hydroxyethylimidazolium bis(trifluoromethanesulfonyl)imide, 1,2-dimethyl-3-hydroxyethylimidazolium hexafluorophosphate, 1,2-dimethyl-3-hydroxyethylimidazolium tetrafluoroborate, 1-hydroxyethyl-2,3-dimethylimidazolium chloride, 1-hydroxyethyl-3-methylimidazolium hydrogen sulfate, 1-hydroxyethyl-3-methylimidazolium toluenesulfonate, 1-hydroxyethyl-3-methylimidazolium dicyanamide, 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-hydroxyethyl 3-methylimidazolium perchlorate, 1-hydroxyethyl-3-methylimidazolium nitrate, 1-hydroxyethyl-3-methylimidazolium hexafluorophosphate, 1-hydroxyethyl-3-methylimidazolium tetrafluoroborate, 1-hydroxyethyl-3-methylimidazolium chloride, trimethylhydroxyethylammonium bis(trifluoromethanesulfonyl)imide, trimethylhydroxyethylammonium hexafluorophosphate, trimethylhydroxyethylammonium tetrafluoroborate, and trimethylhydroxyethylammonium chloride.