PUA emulsion having super strong ability of covering matting powder and realizing high extinction and high permeability and preparation method of PUA emulsion

Abstract

The invention relates to the technical field of coatings, and in particular relates to a PUA emulsion having super strong ability of covering matting powder and realizing high extinction and high permeability and a preparation method of the PUA emulsion. The PUA emulsion having super strong ability of covering the matting powder and realizing high extinction and high permeability includes a polyester diol, diisocyanate, a methacrylate monomer, a chain extender, dibutyltin dilaurate, an initiator, a buffer agent, an emulsifier, triethylamine, an ammonia aqueous solution and water. The PUA emulsion not only has high hardness, but also has better water and solvent resistance, and more important, the PUA emulsion has low costs and can bring higher economic benefits; the water-based polyurethane dispersion mainly plays the role of a high-efficiency dispersant and can efficiently disperse an inorganic matting agent, so that a paint film can still maintain high permeability under the condition of high extinction; and the preparation method of the PUA emulsion having super strong ability of covering the matting powder and realizing high extinction and high permeability has the characteristics of a simple process, low production costs, and suitability for large-scale production.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a PUA emulsion with super strong ability to coat matting powder and realize high matting degree and high permeability and a preparation method thereof. Background technique [0002] With the rapid development of my country's furniture industry, people's demand for coatings continues to grow, which promotes the rapid development of industrial R&D and production of coatings. In the field of traditional coatings, high-gloss glossy coatings are loved by consumers because of their bright and plump paint film surface and beautiful color. However, for the improvement of the quality of life, people have higher and higher requirements for the light reflection of the furniture surface, and the reflection of the high-gloss paint film surface will strongly stimulate the eyes. Therefore, in order to meet the needs of customers in industrial production, they began to find ways to ensure that...

AI Technical Summary

Problems solved by technology

The second method is to use the difference in drying speed and the inconsistency of the shrinkage degree of the upper and lower layers when the paint film is formed to cause the wrinkle phenomenon of the paint film, forming an uneven microscopic surface to achieve the purpose of matting. This method usually uses the resin in the paint The characteristics of the resin and the interaction between the resins are realized, the process method is relatively complicated and the production cost is often high

However, although silica has many advantages for realizing matting of coatings, at the same time, it also has a problem that is difficult to solve in practical applications - "white haze", that is, the permeability of the paint film becomes poor

After the surface of the wood covered by the paint film, although the light becomes soft, the grain of the wood seen by the eyes will become less clear

[0005] Through exploration and verification, it is found that the "white haze" phenomenon on wood is mainly due to the failure of the silica particles to disperse well in the emulsion system after adding a silica matting agent to the emulsion, resulting in that when the paint is sprayed on the surface of the wood, The silicon dioxide particles are too large, and they protrude on the paint film plane in a large area after the paint film is formed and dried, thereby causing white haze phenomenon

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