A kind of water-based paint and its preparation method and application

Abstract

The invention discloses a water-based coating, a preparation method and application thereof, which is prepared from the following preparation materials: water-based ultraviolet light curing polyurethane resin, a substrate wetting agent, a photoinitiator and water. The raw materials used in the water-based paint are simple and less in variety. Compared with the related art, rheological additives and defoamers are not added, which reduces the activation period of rheological additives and defoamers during coating construction and the appearance of the coating after storage. The effect is affected, and the stability of the coating film is improved. It can maintain the original appearance effects such as leveling and fullness after being stored for more than one year, which greatly improves the shelf life of water-based coatings and the stability of the coatings during the shelf life.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based coating and a preparation method and application thereof. Background technique [0002] UV coating refers to that under the irradiation of ultraviolet light, the photoinitiator in the coating absorbs the energy of ultraviolet radiation and then splits into free radicals. The electrons in the outer layer of the molecule jump to generate an active center in a very short time, and then the active center and the The unsaturated groups in the resin act to cause the double bonds in the photo-curable resin and reactive diluent molecules to break, trigger the polymerization, cross-linking, and grafting reactions of the prepolymer, and cure into a network high molecular polymers. As a result, the UV coating can be converted from liquid to solid in a few seconds to form a film-forming substance; its curing speed is fast, and the cured coating film has high hardness and good...

AI Technical Summary

Problems solved by technology

[0003] High-gloss UV coating is one of the most widely used UV coatings. High-gloss UV is widely used in 3C electronic products and automotive interior parts because of its high gloss, good fullness, and good transparency. Solvent-based high-gloss UV coatings are It contains a certain amount of organic solvent, which is diluted with an organic solvent in the actual application process, resulting in VOC ≥ 650g / L. In order to reduce the VOC content in related technologies, a large amount of monomers are often used to replace organic solvents to reduce viscosity. Adding will reduce the hardness and chemical resistance of the coating film, which is not conducive to the surface properties of the coating film, and the monomer is relatively toxic

In related technologies, water-based high-gloss UV coatings are developed to reduce VOC values, but there are disadvantages such as complex components, poor appearance after storage for a period of time, and short shelf life, which limits the development and market acceptance of water-based high-gloss UV to a certain extent.

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