▎ 摘　　要

NOVELTY - Acrylic polyurethane varnish comprises component A and component B, where component A comprises 300-500 pts. wt. aqueous acrylic acid emulsion, 3-7 pts. wt. antifoaming agent, 5-12 pts. wt. flatting agent, 50-100 pts. wt. deionized water, 5-15 pts. wt. fluorescein, 3-10 pts. wt. cosolvent and 0.5-2 pts. wt. oxidized graphene powder; and component B comprises 100-200 pts. wt. aqueous curing agent and 50-100 pts. wt. diluting agent, where weight ratio between component A and component B is 2-5:1. USE - The acrylic polyurethane varnish is useful for detecting metal corrosion (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing acrylic polyurethane varnish comprising (i) dissolving first oxidized graphene powder in deionized water, high-speed ultrasonic dispersion to obtain aqueous solution, mixing aqueous acrylic emulsion, defoamers, leveling agent, cosolvent and oxidized graphene aqueous solution, high-speed dispersing, adding fluorescein to dispersion, scattering for twenty minutes, forming uniform paint to obtain component A, (ii) mixing aqueous curing agent and diluent to obtain component B, and (iii) mixing components A and components B and then stirring to obtain final product.