High-performance water-based bi-component UV (ultraviolet) dual-curing quick-drying finishing varnish coating and application thereof

Abstract

The invention relates to a high-performance water-based double-component UV (ultraviolet) double-curing quick-drying finishing varnish coating which comprises a component A and a component B. The component A comprises the following components in parts by weight: 30-40 parts of water-based ultraviolet curing polyurethane acrylate emulsion, 30-40 parts of water-based hydroxyl acrylic dispersion, 5-10 parts of water-dispersed hyperbranched polyester, 0.2-1 part of a wetting agent and 0.2-1 part of a flatting agent. 0.2-1 part of a defoaming agent, 0.2-1 part of a rheological control agent, 5-10 parts of a cosolvent and 8-15 parts of water; the component B comprises the following components in parts by weight: 60-75 parts of isocyanate resin, 5-20 parts of a cosolvent and 1-5 parts of a photoinitiator; the ratio of the component A to the component B is that the molar ratio of-NCO to-OH is 1.1: 1 to 1.3: 1. Compared with the prior art, the coating disclosed by the invention has the advantages of environmental protection, stable coating performance, excellent mechanical property, excellent liquid medium resistance, excellent weather resistance and the like.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a preparation method and application of a high-performance water-based two-component UV dual-curing fast-drying overcoat varnish coating. Background technique [0002] For a long time, the automotive overcoat varnishes in the domestic market are mainly solvent-based, because solvent-based varnishes have good workability and excellent film performance. In recent years, with environmental regulations restricting volatile organic compound emissions, the market demand for water-based coatings has continued to increase. However, in the automotive refinish coating market, due to the limitation of baking conditions, traditional water-based coatings have slow drying time and long curing time, and the coating needs a long time to achieve stable performance. These unfavorable conditions make it difficult for traditional water-based coatings to meet the fast pace of repair market demand. ; And with...

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Problems solved by technology

However, compared with the traditional two-component polyurethane varnish coating, this patent replaces the reaction curing of part of -OH and -NCO in component A with the more active -NH and -NCO reaction curing, from the perspective of increasing the chemical reaction rate Starting to shorten the curing temperature and curing time of the coating, but as can be seen from its examples, its performance is completely stable, and it still needs several hours of curing time at 60 ° C, and the polyurea coating is too closed because of its coating. Excellent, after the coating is defective or damaged, it will have a negative effect on its water resistance and liquid medium resistance, which will easily cause defects or damage. Water resistance or liquid medium resistance around the paint film will cause blistering

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