UV photocureable coating and preparation method thereof

Abstract

The invention relates to a UV photocureable coating and a preparation method thereof, which belong to the technical field of UV coatings. The UV photocureable coating comprises a component A and a component B, wherein the component A is prepared from the following components in percentage by weight: 50 to 70 percent of water-based hyperbranched polyurea aliphatic polyurethane methacrylate, 10 to 30 percent of water-based aliphatic polyurethane hydroxyl acrylic emulsion, 0.1 to 0.5 percent of photoinitiator, 0.5 to 1 percent of pH regulator, 0.1 to 0.3 percent of water-based foam inhibitor, 0.1 to 0.4 percent of water-based defoaming agent, 0.2 to 0.8 percent of water-based dispersing agent, 0.2 to 0.4 percent of water-based wetting agent, 0.5 to 1 percent of water-based thickening agent, 1 to 2 percent of coalescing agent, 4 to 6 percent of a cosolvent and 9 to 11 percent of deionized water. The obtained UV photocureable coating has excellent wear resistance, insulativity, chemical resistance and weather resistance, and is high in drying speed.

Description

technical field [0001] The invention relates to a UV photocurable coating and a preparation method thereof, belonging to the technical field of UV coatings. Background technique [0002] As the country's environmental protection requirements become more and more stringent, coatings have become a key industry under the government's control. Environmentally friendly coatings mainly include water-based coatings, powder coatings, UV coatings, and solvent-free coatings. However, UV coatings have high market performance requirements due to the large molecular weight of resin monomers. If all monomers with low molecular weight are used for dilution, the performance requirements required by the market cannot be met. Therefore, low boiling point is currently used in the production of UV coatings on the market. The ester and ketone solvents, such as ethyl ester, acetone, etc., will seriously affect the VOC emission of UV coatings. In the 3C electronic product industry, South China and...

AI Technical Summary

Problems solved by technology

However, water-based UV coatings still have the following disadvantages: 1. Most of the water in the system needs to be dried and removed before curing, which increases energy consumption, prolongs time, and reduces production efficiency; 2. The high surface tension of water is not easy to infiltrate base 3. The gloss of the cured film is low, and the water resistance and scrub resistance are poor; 4. Water-based UV raw materials are more expensive, resulting in higher cost of water-based UV High; the system stability is poor, and the PU value is relatively sensitive; 5. The water-based system is prone to bacteria, freezing, and the formula structure is complex; 6. There is still a large gap in the comprehensive performance of water-based UV coatings compared with solvent-based UV, such as: hardness, Scratch resistance, gloss, chemical resistance, abrasion resistance and more

However, most of the above-mentioned methods have problems such as complicated preparation technology and poor curing effect.

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