▎ 摘　　要

NOVELTY - Method for preparing aqueous-based polyurethane coating involves (i) dispersing graphene oxide in deionized water, adding cobalt chloride and calcium titanate, dispersing for 10-14 minutes, transferring the resulting system to the reaction kettle, reacting at 160-163 degrees C for 12-14 hours, and reducing the temperature at a rate of 2-3 degrees C/minute, filtering at room temperature, washing with deionized water, drying to obtain metal oxide-containing graphene oxide composites, (ii) adding 1,5-naphthalene diisocyanate to acetone, stirring and dissolving, adding metal oxide-containing graphene oxide composites, heating at 65-70 degrees C and reacting at 200-300 rpm for 4-5 hours to obtain graphene oxide composite-isocyanate prepolymer containing metal ions, and (iii) adding polyol, catalyst, chain extender to prepolymer, stirring and reacting for 3-5 hours, cooling and adding 2-3 pts. wt. 1,3 cyclohexanedimethylamine, 80-120 pts. wt. ice water, and emulsifying at 1500-1800 rpm for 1-2 hours. USE - Method for preparing aqueous-based polyurethane coating. ADVANTAGE - The method has excellent anti-corrosion performance, scratch resistance, strong adhesion, high hardness, and acid and alkali resistance, is conducive to the flow of electrons and enhances conductivity. DETAILED DESCRIPTION - Method for preparing aqueous-based polyurethane coating involves (i) dispersing 10-12 pts. wt. graphene oxide in deionized water at 35-40 degrees C under 130-150 rpm for 15-20 minutes, adding 4-6 pts. wt. cobalt chloride and 10-15 pts. wt. calcium titanate, continuously dispersing for 10-14 minutes, transferring the resulting system to the reaction kettle, reacting at 160-163 degrees C for 12-14 hours, and reducing the temperature at a rate of 2-3 degrees C/minute, filtering at room temperature, washing with deionized water, drying at 45-50 degrees C to obtain metal oxide-containing graphene oxide composites, (ii) adding 50-80 pts. wt. 1,5-naphthalene diisocyanate to 120-180 pts. wt. acetone, stirring and dissolving at 40-45 degrees C under 150-180 rpm for 15-20 minutes, adding 15-18 pts. wt. metal oxide-containing graphene oxide composites obtained in step (i), heating at 65-70 degrees C and reacting at 200-300 rpm for 4-5 hours to obtain graphene oxide composite-isocyanate prepolymer containing metal ions, and (iii) adding 50-60 pts. wt. polyol, 0.02-0.05 pts. wt. catalyst, 5-8 pts. wt. chain extender to 50-80 pts. wt. prepolymer obtained in step (ii), continuously stirring and reacting for 3-5 hours, cooling and adding 2-3 pts. wt. 1,3 cyclohexanedimethylamine, 80-120 pts. wt. ice water, and emulsifying at 1500-1800 rpm for 1-2 hours.