Polyester polyurethane high-gloss white stoving varnish and coating process thereof

Abstract

The invention provides a polyester polyurethane high-gloss white stoving varnish and a coating process thereof, and belongs to the field of coatings. The stoving varnish is composed of the following raw materials in percentages by mass: 35.0-45.0 wt% of polyester polyurethane resin, 1.5-3.5 wt% of a neutralizing agent, 0.5-3.0 wt% of a dispersant, 10.0-20.0 wt% of titanium dioxide, 0.2-1.0 wt% ofan anti-settling agent, 0.1-0.5 wt% of an antifoaming agent, 0.2-1.5 wt% of a bactericide, and 30.0-50.0 wt% of deionized water; and the polyester polyurethane resin is prepared from the following rawmaterials in terms of mass percentage of the polyester urethane resin: 16.0-26.0 wt% of trimethylolethane, 4.0-6.0 wt% of pentaerythritol, 10.0-15.0 wt% of 2,2-dimethyl-1,3-propanediol, 6.0-10.0 wt%of isophthalic acid, 8.0-12.0 wt% of adipic acid, 12.0-17.0 wt% of propylene glycol diacetate, 7.0-11.0 wt% of dimethylolpropionic acid, and 18.0-22.0 wt% of a partially-blocked isocyanate curing agent. The polyester polyurethane high-gloss white stoving varnish provided by the invention performs end capping on an isocyanate curing agent, avoids the problem of an activation period and improves storage stability.

Description

technical field [0001] The invention relates to a polyester polyurethane high-gloss white baking varnish, which belongs to the field of coatings. Background technique [0002] At present, the heat-cured baking varnish film prepared by using amino resin alone is hard and brittle, and there are still some problems in poor adhesion, impact resistance, and high-temperature anti-yellowing. The solution is to use amino resins in combination with other resins, so there are some baking varnishes used in combination with polyester and amino resins, but some of these baking varnishes are two-component A and B, and the two components need to be mixed in a certain proportion before coating Uniform, and the weather resistance of the paint film is average, but the water resistance is poor. Some are a one-component mixture of polyester and amino resin, heat-cured, but because the compatibility of polyester and amino resin is not very good, the storage stability will also deteriorate, and ...

AI Technical Summary

Problems solved by technology

The solution is to use amino resins in combination with other resins, so there are some baking varnishes used in combination with polyester and amino resins, but some of these baking varnishes are two-component A and B, and the two components need to be mixed in a certain proportion before coating Uniform, and the weather resistance of the paint film is average, but the water resistance is poor

Some are a one-component mixture of polyester and amino resin, heat-cured, but because the compatibility of polyester and amino resin is not very good, the storage stability will also deteriorate, and it is easy to layer

And when configuring amino resin and polyester, organic solvents are used to configure, resulting in high volatile organic compounds and polluting the environment

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