▎ 摘　　要

NOVELTY - Producing heat-resistant graphene oxide composite melamine resin comprises (i) preparing modified graphene oxide; (ii)(a)adding aqueous formaldehyde solution, melamine, and hexamethylenetetramine into the reaction vessel, performing the reaction under stirring conditions, prepolymerizing melamine with 37% formaldehyde solution, where the molar ratio of melamine to formaldehyde is 1:2-3, and controlling the prepolymerization at 85-105 degrees C under the pH 8-8.5 for 70-120 minutes; (b) adding polyethylene glycol for poly-condensation and controlling the pH to 5-6, controlling poly-condensation temperature at 45-55 degrees C for 80-100 minutes; (iii) adding graphene oxide to the composite melamine formaldehyde resin, stirring, adding alkaline pH adjuster, adjusting the pH to 8-9 and reacting for 3-4 hours to obtain a melamine resin prepolymer containing graphene oxide; and (iv) placing prepolymer in a vacuum oven at 30 degrees C, removing water, adjusting the pH to 5-6, and curing. USE - The method is useful for producing heat-resistant graphene oxide composite melamine resin. ADVANTAGE - The resin improves corrosion resistance and toughness of resin; and improves flexibility and bending property of melamine resin. DETAILED DESCRIPTION - Producing heat-resistant graphene oxide composite melamine resin comprises (i) preparing modified graphene oxide by dissolving polyacrylonitrile solution in dimethylformamide to obtain 4 wt% solution, dissolving polyethylene oxide in a methylene chloride solvent to obtain 4 wt% solution, and mixing homogeneously the above two solutions, adding titanium dioxide nano-tubes and graphene oxide, and stirring uniformly mixture, and adding trifluoroethyl methacrylate and tert-butyl hydroperoxide, heating to 60-70oC, stirring, reacting for 1-2 hours, filtering, washing the filter cake with ethanol 2-3 times to obtain modified graphene oxide; (ii)(a) adding aqueous formaldehyde solution, melamine, and hexamethylenetetramine into the reaction vessel, performing the reaction under stirring conditions, prepolymerizing melamine with 37% formaldehyde solution, where the molar ratio of melamine to formaldehyde is 1:2-3, and controlling the prepolymerization at 85-105 degrees C under the pH 8-8.5 for 70-120 minutes, and the quality of hexamethylenetetramine is 4-12% of the total mass of melamine and the quality of hexamethylenetetramine is 4-12% of the total mass of melamine; (b) adding polyethylene glycol for poly-condensation and controlling the pH to 5-6, where the mass of polyethylene glycol is 40-60% of the mass of melamine, and the polyethylene glycol has a molecular weight of 800-1500, controlling poly-condensation temperature at 45-55 degrees C for 80-100 minutes; (iii) adding graphene oxide to the composite melamine formaldehyde resin, stirring for 10-20 minutes, adding alkaline pH adjuster, adjusting the pH to 8-9 and reacting for 3-4 hours to obtain a melamine resin prepolymer containing graphene oxide; and (iv) placing the prepolymer in a vacuum oven at 30 degrees C, removing water, adjusting the pH to 5-6, and curing in an oven at 50 degrees C for 8-9 hours.