▎ 摘　　要

NOVELTY - Preparing anti-corrosion polyurethane aqueous coating comprises: (i) adding polyether trihydric alcohol, diisocyanate and catalyst in reaction bottle; (ii) placing carboxylated graphene in thionyl chloride and N,N-dimethylformamide solvent, dispersing, refluxing and reacting, adding double-end amino polyethylene glycol, stirring and refluxing, filtering, washing, and drying; (iii) adding amino-terminated polyether grafted graphene into tetrahydrofuran, dispersing, adding triethylamine and silane coupling agent, refluxing, washing, and drying; (iv) adding modified graphene oxide into tetrahydrofuran, dispersing, filling nitrogen to replace air in reaction bottle, adding polyurethane prepolymer, stirring and reacting, suspending and evaporating; and (v) transferring polyurethane emulsion to stirring device, adding de-foaming agent and flatting agent, stirring, adding film-forming auxiliary agent and filler, stirring, adding de-foaming agent, flatting agent and water, and stirring. USE - The method is useful for preparing anti-corrosion polyurethane aqueous coating. ADVANTAGE - The polyurethane emulsion has anti-corrosive characteristic. The polyether chain between graphene and polyurethane segment increases its hydrophilicity and dispersibility, which is convenient for various auxiliary agent to enter into polyurethane emulsion system, so as to form aqueous polyurethane coating, thus greatly improving strength of polyurethane coating. The water is main solvent, green and environment-friendly, which is suitable for coating inner wall of building. The coated paint film has good self-cleaning performance, smooth surface, excellent adhesive force, and long aging-resistant time. DETAILED DESCRIPTION - Preparing anti-corrosion polyurethane aqueous coating comprises: (i) adding polyether trihydric alcohol in reaction bottle, vacuum stirring for 2 hours, adding diisocyanate and 50 ppm catalyst, and stirring and reacting for 1 hour to obtain polyurethane prepolymer; placing carboxylated graphene in thionyl chloride and N,N-dimethylformamide solvent, ultrasonically and uniformly dispersing, refluxing and reacting for 2 hours at 70-80 degrees C, adding double-end amino polyethylene glycol, continuously stirring and refluxing for 24 hours, filtering, washing, and drying to obtain amino-terminated polyether grafted graphene; (iii) adding amino-terminated polyether grafted graphene into tetrahydrofuran, ultrasonically dispersing for 4 hours, adding triethylamine and silane coupling agent under nitrogen atmosphere, refluxing for 24 hours at 50-60 degrees C, washing for multiple times with ethanol and water, and vacuum drying to obtain modified graphene oxide; (iv) adding modified graphene oxide into tetrahydrofuran, ultrasonically and uniformly dispersing, filling nitrogen to replace air in reaction bottle, adding equal amount of polyurethane prepolymer, stirring and reacting at 80 degrees C for 2 hours under nitrogen atmosphere, suspending and evaporating to remove organic solvent, and adding water to emulsify to obtain polyurethane emulsion; and (v) transferring polyurethane emulsion to stirring device, orderly adding de-foaming agent and flatting agent, stirring at 800-1000 revolutions/minute for 20 minutes, orderly adding film-forming auxiliary agent and filler, stirring at 1000-1200 revolutions/minute for 20 minutes, adding de-foaming agent, flatting agent and water, and stirring at 1200 revolutions/minute for 15 minutes to obtain anti-corrosion polyurethane aqueous coating. An INDEPENDENT CLAIM is also included for anti-corrosion polyurethane aqueous coating, prepared by above method.