Water-based high-gloss finish paint as well as preparation method and application thereof

Abstract

The invention discloses water-based high-gloss finish paint as well as a preparation method and application thereof. The water-based high-gloss finish paint is prepared from the following raw materials: water-based ultraviolet curing polyurethane resin, a base material wetting agent, a cosolvent and a photoinitiator, and the water-based ultraviolet light curing polyurethane resin is prepared from water-based ultraviolet light curing polyurethane I and water-based ultraviolet light curing polyurethane II. A coating formed by curing the water-based high-gloss finish paint has excellent flexibility when being applied to a base coat, and has certain bending resistance while keeping high hardness, so that the application scene of the coating is expanded. The coating disclosed by the invention has excellent interlayer adhesion to a base coat, is wide in adaptability to the base coat, and can keep a relatively good mirror surface leveling effect on various base coats.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based high-gloss finish paint and its preparation method and application. 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 splits into free radicals, and the electrons in the outer layer of its molecules jump to generate active centers in a very short time, and then the active centers and The action of unsaturated groups in the resin triggers the breakage of the double bonds in the photocurable resin and reactive diluent molecules, triggers the polymerization, crosslinking, and grafting reactions of the prepolymer, and solidifies into a network in a short period of time. molecular polymer. As a result, the UV coating is converted from liquid to solid within a few seconds to form a film-forming substance; its curing speed is fast, the cured...

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Problems solved by technology

[0003] In the related art, the spray-type high-gloss UV coating is a solvent-based UV coating, and the VOC content is relatively high, generally ≥550g / L, even if the low-VOC one is generally between 450g / L and 550g / L, in order to reduce the VOC content, A large amount of monomers are often used to replace organic solvents to reduce viscosity; but the addition of monomers will reduce hardness, chemical resistance, etc., which is not conducive to the surface properties of the coating film, and monomers are relatively toxic

[0004] The VOC content of the water-based high-gloss coating is relatively low, and has a relatively broad application prospect; but when the water-based high-gloss UV coating in the related art is applied to the primer, the interlayer stress coordination is not good, the flexibility is insufficient, and the hardness is high. The paint film is brittle and collapsed during the 100-grid test. When it is subjected to external force impact in actual application, the coating will crack and break away from the primer when it releases the stress.

At the same time, when the water-based high-gloss UV coating in the related art is applied to the primer, the mirror surface leveling effect is the best when the film thickness is ≥ 40 μm, and the film thickness is ≤ 20 μm. Effect

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