▎ 摘　　要

NOVELTY - Self-repairing water-based polyurethane anti-corrosion coating comprises 0.002-0.005 pts. wt. graphene oxide, 20-50 pts. wt. water-based polyurethane emulsions, 5-20 pts. wt. tung oil, 5-15 pts. wt. polyvinyl alcohol, 1-10 pts. wt. silane coupling agent, 1-10 pts. wt. phosphoric acid, 0.01-0.4 pts. wt. photoinitiator and 30-110 pts. wt. deionized water. USE - Self-repairing water-based polyurethane anti-corrosion coating. ADVANTAGE - The self-repairing water-based polyurethane anti-corrosion coating has smooth and uniform surface, bright color, stable structure, good thermal stability, strong water resistance, excellent mechanical properties, excellent adhesion, corrosion resistance, abrasion resistance and self-healing. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing self-healing type waterborne polyurethane anti-corrosion coating, which involves: a. obtaining appropriate amount of graphene oxide, adding to beaker containing deionized water, and carrying out ultrasonic dispersion treatment for 2 hours to obtain graphene oxide dispersion; b. obtaining appropriate amount of absolute ethanol and silane coupling agent, adding to beaker, adding prepared graphene oxide dispersion in beaker, and carrying out ultrasonic treatment after uniform stirring; c. adjusting pH of system to 3-5 with phosphoric acid, raising temperature to 50degrees Celsius for 30 minutes under low-speed stirring, and raising temperature to 70degrees Celsius for 2 hours, after reaction is completed, temperature is normal, cooling to room temperature to obtain modifier; d. transferring graphene oxide dispersion and modifier to centrifuge tube for centrifugation for 3 minutes, taking out sediment at bottom, washing, placing in vacuum drying oven, and drying at 60degrees Celsius for 12 hours to obtain silane-modified graphene oxide powder; e. adding silane-modified graphene oxide powder to polyvinyl alcohol and ultrasonically dispersing to obtain capsule wall composite solution; f. adding tung oil and distilled water, in four-necked flask, stirring and heating up to 50degrees Celsius, after uniform dispersion, passing nitrogen to discharge air, under nitrogen protection, dropping capsule wall composite solution, and stirring at high speed; g. heating up to 80degrees Celsius for 2 hours to obtain off-white spherical particles, stopping stirring, filtering and discharging, washing with distilled water three times, and air-drying to obtain the modified graphene oxide microcapsule product; and h. adding modified graphene oxide microcapsule product and photoinitiator into reheated water-based polyurethane, and after fully mixing, vacuum-baking mixture for 30 minutes to remove air bubbles to obtain self-healing water-based polyurethane anti-corrosion coating.