▎ 摘　　要

NOVELTY - Manufacture of graphene oxide-modified aqueous polyurethane coating film-forming agent involves preparing aqueous polyurethane prepolymer by sequentially adding 9-12 pts. wt. isocyanate, 15-18 pts. wt. polycarbonate diol and 20-30 pts. wt. acetone to a reactor, stirring and heating at 70-80 degrees C to obtain a polyurethane prepolymer, adding the polyurethane prepolymer and 30-40 pts. wt. acetone, stirring at 70-80 degrees C, and adding 1.2-1.6 pts. wt. dimethylolpropionic acid, and adding 1-2 pts. wt. hydroxy-terminated hyperbranched graphene oxide powder to the aqueous polyurethane prepolymer, performing chain extension and intercalation reaction by stirring at 70-80 degrees C, reducing the temperature to 40-50 degrees C, adding 0.9-1.1 pts. wt. triethylamine to neutralize and stir, adding 90-120 pts. wt. deionized water to stir and emulsify, and removing acetone using a rotary evaporator at 40-50 degrees C to obtain a graphene oxide-modified aqueous polyurethane coating agent having a solid content of 18-22%. USE - Manufacture of graphene oxide-modified aqueous polyurethane agent (claimed) used for forming coating film used for radiator, radiating fins, light device, engine, and electronic device. ADVANTAGE - The method enables convenient, economical and environmentally-friendly manufacture of graphene oxide-modified aqueous polyurethane coating agent using easily available raw material. The coating agent provides film having excellent heat conductivity, heat resistance, flame retardance, smoke suppression effect, antistatic property, corrosion resistance, and mechanical property, such as tear strength and tensile strength. DETAILED DESCRIPTION - Manufacture of graphene oxide-modified aqueous polyurethane coating film-forming agent involves preparing (i) hydroxy-terminated hyperbranched graphene oxide powder by adding 1-2 pts. wt. graphene oxide nanosheet powder to 60-80 pts. wt. N,N'-dimethylformamide, uniformly dispersing, ultrasonically-processing, sequentially adding 6-9 pts. wt. hydroxy-terminated hyperbranched polyester, 0.9-1.2 pts. wt. dicyclohexylcarbodiimide as a catalyst and 0.1-0.2 pts. wt. 4-dimethylaminopyridine, stirring at 25-30 degrees C, reacting, vacuum-filtering under reduced pressure, washing, and freeze-drying, preparing (ii) aqueous polyurethane prepolymer by sequentially adding 9-12 pts. wt. isocyanate, 15-18 pts. wt. polycarbonate diol and 20-30 pts. wt. acetone to a reactor, stirring and heating at 70-80 degrees C to obtain a polyurethane prepolymer, adding the polyurethane prepolymer and 30-40 pts. wt. acetone, stirring at 70-80 degrees C, and adding 1.2-1.6 pts. wt. dimethylolpropionic acid, and adding (iii) 1-2 pts. wt. hydroxy-terminated hyperbranched graphene oxide powder to the aqueous polyurethane prepolymer, performing chain extension and intercalation reaction by stirring at 70-80 degrees C, reducing the temperature to 40-50 degrees C, adding 0.9-1.1 pts. wt. triethylamine to neutralize and stir, adding 90-120 pts. wt. deionized water to stir and emulsify, and removing acetone using a rotary evaporator at 40-50 degrees C to obtain a graphene oxide-modified aqueous polyurethane coating film-forming agent having a solid content of 18-22%. An INDEPENDENT CLAIM is included for graphene oxide-modified aqueous polyurethane coating film-forming agent, which has a heat conductivity of 1.55-1.76 W/(m.K) when the coating is modified under a heat source of 100 degrees C to reduce the temperature of substrate by 8.3-10.5 degrees C, a heat resistance when glass transition temperature reaches 190-200, a flame retardance including a limiting oxygen index of 29-33%, a maximum heat release rate of 204.6-211.5 KW/m2, a smoke density of 105.8-115.3 and a smoke suppression effect, an antistatic property including a volume resistivity of 5.6x 10-2 to 8.7x 10-2 ( Omega ).m and a surface resistivity of 6.82-8.45 ( Omega ).m, a corrosion resistance including a salt spray resistance of 1300-1500 hours, a self-corrosion potential of the coating of -0.6 to -0.7 V and a corrosion current density is 0.02-0.03 mu A/cm2, and a strong mechanical property including a tear strength of 136.7-143.5 kN/m, a tensile strength of 47.6-51.8 MPa and an adhesive force of level II.