▎ 摘　　要

NOVELTY - An aqueous coating composition comprises primer including 8-12 pts. wt., preferably 10 pts. wt. aqueous epoxy emulsion, 8-12 pts. wt., preferably 10 pts. wt. aqueous polyurethane emulsion, 6-15 pts. wt., preferably 11 pts. wt. aqueous epoxy curing agent, 50-65 pts. wt., preferably 57.5 pts. wt. zinc powder, 5-10 pts. wt., preferably 7.5 pts. wt. graphene, 1-2 pts. wt., preferably 1.5 pts. wt. leveling agent and 14-25 pts. wt., preferably 20 pts. wt. deionized water, and topcoat including 10-14 pts. wt., preferably 12 pts. wt. aqueous epoxy emulsion, 10-14 pts. wt., preferably 12 pts. wt. aqueous acrylic emulsion, 15-30 pts. wt., preferably 22.5 pts. wt. aqueous polyurethane emulsion, 1-3 pts. wt., preferably 2 pts. wt. epoxy diluent, 20-30 pts. wt., preferably 25 pts. wt. filler, 0.1-2 pts. wt., preferably 1 pt. wt. leveler, 0.1-2 pts. wt., preferably 1 pt. wt. defoamer, 1-2 pts. wt., preferably 1.5 pts. wt. thixotropic additive. USE - Aqueous coating composition for cold chain containers (claimed). ADVANTAGE - The aqueous coating exerts the synergistic effect of multi-component mixed resin, has good adhesion between primer coating and topcoat, saves intermediate layer coating, saves cost, and has good adhesion, corrosion resistance, impact resistance, temperature change resistance, anti-sagging performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application method of the aqueous coating composition to surface of container metal plates for cold chain containers, which involves spraying the primer on the surface of metal plate of home appliance after pretreatment, baking and drying after leveling, and cooling, spraying the topcoat on the surface of primer coating, baking and drying after leveling.