Baking type waterborne acrylic coating composition with excellent thixotropy and preparation method thereof

Abstract

The invention relates to the technical field of coatings, specifically to a baking type waterborne acrylic coating composition with excellent thixotropy and a preparation method thereof. The coating composition provided by the invention is prepared from the following main raw materials by weight: 0.05 to 0.45% of a functional filling material A, 10 to 15% of deionized water, 30 to 38% of tertiaryamine group containing hydroxyl-functionalized waterborne acrylic resin, 2.5 to 4.5% of waterborne amino resin, 4.5 to 8% of a cosolvent A, 0.1 to 0.8% of a dispersant, 0.1 to 0.55% of a leveling agent, 0.1 to 0.65% of an anti-foaming agent, 0.05 to 0.4% of a pH regulator, 5 to 15% of a pigment, 10 to 40% of a filling material B, 0.1 to 0.85% of a rheological auxiliary agent and 3.5 to 9.7% of a cosolvent B, wherein the functional filling material A is hectorite or flaky silicate. The coating provided by the invention has excellent thixotropy, sag resistance and stone-bumping resistance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a baking-type water-based acrylic coating composition with excellent thixotropy and a preparation method thereof. Background technique [0002] The baking-type water-based acrylic coating is mainly prepared by using water-based hydroxyacrylic resin as the film-forming resin, adding water-based amino resin, adding pigments and fillers and water-based additives, and grinding and dispersing. At present, during the construction process of baking-type water-based acrylic coatings, since the baking temperature is generally above 140°C, the viscosity of the coating during the construction process will drop significantly due to the increase in temperature, resulting in the current baking-type water-based acrylic coatings. hang. At present, rheological additives are mainly used to solve the sag problem, such as polyurethane thickeners, but in fact, the anti-sag effect of rheological add...

AI Technical Summary

Problems solved by technology

At present, during the construction process of baking-type water-based acrylic coatings, since the baking temperature is generally above 140°C, the viscosity of the coating during the construction process will drop significantly due to the increase in temperature, resulting in the current baking-type water-based acrylic coatings. hang

At present, rheological additives are mainly used to solve the sag problem, such as polyurethane thickeners, but in fact, the anti-sag effect of rheological additives at high temperatures is not ideal

In addition, a certain amount of co-solvent needs to be added to the baking-type water-based acrylic coating system. The existence of co-solvent will destroy the thixotropic effect of polyurethane thickener, and the coating is more likely to sag during the construction process, especially on the facade. In spraying construction, the problem of paint sagging is more serious

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