▎ 摘　　要

NOVELTY - Polyurethane coating comprises 55-65 pts. wt. hydroxy acrylic resin, 12-18 pts. wt. solvent, 0.5-2 pts. wt. filler, 0.2-2 pts. wt. auxiliary agent, 12-18 pts. wt. isocyanate compound and 5-8 pts. wt. pigment. The solid content of the hydroxy acrylic resin is 66-70 wt.%, the viscosity is 5000-6000cps (23℃) and the hydroxy value is 100-105 mg potassium hydroxide/g. USE - The polyurethane coating is useful for construction at low temperature, acid and alkali resistance, ultraviolet aging and salt mist resistance. ADVANTAGE - The polyurethane coating: has good anti-aging performance and anti-tarnishing performance, strong adhesive force, high hardness, scratch resistance and good film forming property; and solves problem of foaming, crack and delamination. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing polyurethane coating, comprising (i) adding the hydroxy acrylic resin, solvent, auxiliary agent and pigment into the production reaction device and stirring for 10-30 minutes to obtain mixture a; (ii) adding the mixture a and the filler into a sand mill for grinding for 2-4 hours to obtain the mixture b; and (iii) adding the isocyanate compound into the mixture b and dispersing for 5-15 minutes.