Yellowing-resistant quick-drying polyurethane wood paint and using method thereof

Abstract

The invention provides a yellow-resistant quick-drying polyurethane wood paint and a using method thereof. The polyurethane wood paint is prepared by mixing a main paint, a curing agent and a diluent, wherein the main paint comprises 30 to 45 weight percent of hydroxylated acrylic resin; and the curing agent comprises 40 to 50 weight percent of hexamethylene diisocyanate prepolymer. The paint film of the yellow-resistant quick-drying polyurethane wood paint provided by the invention has excellent yellowing resistance; and the yellowing resistance delta E is less than 0.5 when the polyurethane wood paint is radiated by UVA for 168 hours or naturally stored indoors for three years; and the paint film overcomes the defect that the hexamethylene diisocyanate prepolymer and the hydroxylated acrylic resin reacts slowly, and the surface dry time and the pressure dry time of the paint film are respectively 0.5 hour and 1.5 hours (at a temperature of 25 DEG C and a humidity of 50 percent).

Description

technical field [0001] The invention relates to a polyurethane wood paint. Background technique [0002] Polyurethane wood paint (referred to as PU wood paint, the same below) on the market today, the main paint is generally made of vegetable oil short oil alkyd resin as the base material, and the curing agent is generally made of toluene diisocyanate adduct or toluene diisocyanate trimer system. Do, the paint film after mixing and curing the main paint and curing agent in proportion has the following defects, (1) the aromatic urethane bond in its polyurethane is easily oxidized to quinone by ultraviolet rays and turns yellow, (2) vegetable oil short oil alkyd A small amount of unsaturated double bonds in the resin are oxidized by ultraviolet rays and turn yellow, resulting in poor yellowing resistance of the paint film, and the yellowing resistance (UVA, 168 hours) / ΔE color difference is more than 10.0, which affects the decoration quality. SUMMARY OF THE INVENTION [00...

AI Technical Summary

Problems solved by technology

[0002] Polyurethane wood lacquer (referred to as PU wood lacquer, the same below) on the market today is generally made of vegetable oil short oil alkyd resin as the base material, and the curing agent is generally toluene diisocyanate adduct or toluene diisocyanate trimer system. Do, the main paint and the curing agent are mixed in proportion to the cured paint film, which has the following defects, (1) the aromatic urethane bond in the polyurethane is easily oxidized to quinone by ultraviolet rays and turns yellow, (2) the short oil alkyd of vegetable oil A small amount of unsaturated double bonds in the resin are oxidized by ultraviolet rays and turn yellow, resulting in poor yellowing resistance of the paint film, and the yellowing resistance (UVA, 168 hours) / ΔE color difference is more than 10.0, which affects the decoration quality