A kind of high anti-yellowing film-coated UV white bright topcoat and preparation method thereof

Abstract

The invention relates to the field of coatings, in particular to a high-yellowing-resistant film-coated UV white bright topcoat and a preparation method thereof. A high-yellowing-resistant film-coated UV white bright topcoat, which is composed of the following components in weight percentage: 20-40% of six-functional polyurethane acrylic acid; 30-50% of di-functional polyurethane acrylic acid; 10-20% of monomer; 10-20% white paste; 3-6% photoinitiator; 0.2-2% functional additive; the titanium white paste is composed of the following components by weight percentage: titanium dioxide 50-70%; six-functionality polyurethane acrylic acid 10% ~25%; monomer 10~25%; wetting and dispersing agent 0.5~2%. The high-yellowing-resistant film-coated UV white bright topcoat of the invention solves the problem of deep-layer curing of the colored system of photocurable coatings and the fundamental problem of yellowing resistance of the white system.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a high-yellowing-resistant film-coated UV white bright topcoat and a preparation method thereof. Background technique [0002] Traditional oil-based paints have been widely used on wood, plastic, paper, metal and other substrates. In formula design, traditional coatings contain a large amount of solvents, which will produce toxic and irritating organic compounds during use, which are very harmful to people's health and fail to meet the environmental protection requirements that people are increasingly pursuing. With the continuous development of society and the continuous improvement of people's living standards, people's requirements for civil coatings are also getting higher and higher. More importantly, they pay close attention to their own health, such as children's toy paints, children's furniture paints, etc., which are required not to contain harmful substances. and heavy metals. ...

AI Technical Summary

Problems solved by technology

The second is the instability of the initiator itself. Some photoinitiators will produce some by-products when they are decomposed by ultraviolet radiation to generate free radicals. The by-products have a quinone structure or a strong rigid conjugated plane, which is easy to absorb Band of sunlight, so that the coating appears yellow

The yellowing of the coating seriously affects the aesthetics of the product

Moreover, in the existing UV paint, due to the defects of the lighting equipment, the coating often cannot be fully cured.