Double-component polyurethane water-based paint

Abstract

The invention provides a double-component polyurethane water-based paint, belonging to the field of organic polymer compounds. The double-component polyurethane water-based paint comprises isocyanate curing agents component A and component B, wherein the molar ratio of OH groups of a polymer in the component A to NCO groups in the component B is 1: (1-2.2); and the component A contains polymer aqueous dispersion and polymer emulsion, wherein the content of OH in the polymer aqueous dispersion is 2.0-5.0% and the grain size of latex in the polymer aqueous dispersion is 10-100nm, the weight of the polymer emulsion is 0.05-16 times that of the polymer aqueous dispersion, the content of OH in the polymer emulsion is 0-2.0%, and the grain size of the latex in the polymer emulsion is 80-500nm. In the invention, the polymer aqueous dispersion which has small average grain size and contains -OH and the polymer emulsion which has large average grain size are compounded, wherein the latex with a large grain size can increase the roughness and unevenness of a film and reduce the gloss of the film, and the emulsion with small particles promotes the latex with the large grain size to aggregate, reduces the lowest film-forming temperature of the film, improves the film-forming capability of the film and decreases the usage amount of a film-forming additive; and the hardness, chemical-resistance and wear-resistance of the film are improved by using two different water-based polymers are used for compounding.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and relates to polymer compounds obtained only with isocyanate or isothiocyanate, in particular to polyurethane. Background technique [0002] With the enhancement of environmental protection awareness and the improvement of environmental regulations, water-based coatings have attracted more and more attention. Among them, water-based two-component coatings have the advantages of high performance and multi-function, which is the development direction of water-based coatings. People's pursuit of high-quality life has led to an increasing demand for water-based matte coatings, and the development of high-performance water-based two-component matte coatings has become a research hotspot. [0003] Matte paint is to add a certain amount of matting agent to the paint. During the film-forming process of the paint, the matting agent is entrained to the surface of the coating film due to the volat...

AI Technical Summary

Problems solved by technology

However, the dispersion stability of the former matting powder is not good, so that the matting powder and the resin will be delaminated and agglomerated during the storage process of the matte paint, which will reduce the matting effect and reduce the storage stability of the matte paint. The latter will increase the construction process. The complexity of the coating, and the uneven dispersion of the matting powder reduces the performance of the coating, especially the hardness and chemical resistance of the coating film.

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