Micro-nano modified high-weather-resistance anti-corrosion polyurethane coating and preparation method thereof

The invention discloses a micro-nano modified polyurethane coating with high weather resistance and corrosion resistance and a preparation method thereof. The coating is composed of a component A and a component B. The component A comprises, by mass, 20-30% of polyester polyol resin, 20-30% of hydroxy acrylic resin, 12-18% of a solvent, 1-5% of a wetting dispersant, 1-3% of a thixotropic agent, 0.5-2% of a light stabilizer, 0.5-1% of an antioxidant, 0.5-2% of an ultraviolet light absorber, 0.5-2% of a coupling agent, 1-2% of an antifoaming agent, 0.5-2% of a leveling agent, 0.1-1% of a curing accelerator and 30-60% of a filler. The component B is prepared from the following components in percentage by mass: 80 to 90 percent of HDI tripolymer and 10 to 20 percent of solvent; the micro-nano modified high-weather-resistance anti-corrosion polyurethane coating provided by the invention has excellent corrosion resistance and weather resistance, has a good protection effect on high humidity, high salt mist, strong