Hydroxyl acrylic resin with ultrahigh solid content as well as preparation method and application thereof

The invention discloses hydroxyl acrylic resin with ultrahigh solid content and a preparation method and application thereof, the hydroxyl acrylic resin with ultrahigh solid content is prepared by modifying hydroxyl acrylic resin with micro-branched polyester polyol, and the solid content of the hydroxyl acrylic resin with ultrahigh solid content is 88-92%. The hydroxyl acrylic resin with the ultrahigh solid content of 88-92% is prepared from the micro-branched polyester polyol modified hydroxyl acrylic resin, the viscosity is 15000-30000 cps, the hydroxyl value is 165 mgKOH/g, the acid value is 5-10 mgKOH/g, later packaging and use are facilitated, the application range of the resin is widened, the VOC of the colored paint prepared from the hydroxyl acrylic resin is smaller than or equal to 300 g/L, and the color paint is suitable for being used in a large scale. The application range of the colored paint coating is widened, the whole preparation process is simple, and the colored paint coating is suitable f