Low-viscosity high-solid acrylic polyurethane coating and preparation method thereof

Abstract

The invention relates to a coating for coating various surfaces, and particularly relates to a low-viscosity high-solid acrylic polyurethane coating and a preparation method thereof. The low-viscosity high-solid acrylic polyurethane coating comprises the following components: by mass, 60-70 parts of acrylic acid modified resin, 0.5-2 parts of a leveling agent, 25-30 parts of rutile-type titanium dioxide, 0.2-1 parts of a defoaming agent, 1-3 parts of a surfactant, 0.2-1 part of a dispersing agent, 0.8-1.2 parts of an anti-settling agent and 10-13 parts of a curing agent; the acrylic acid modified resin comprises the following raw materials: by weight, 45-60 parts of methyl acrylate, 40-50 parts of methacrylate, 3-7 parts of 2, 4-dimethoxysilane and 0.1-2 parts of dibutyl potassium. The low-viscosity high-solid acrylic polyurethane coating prepared by the preparation method has a greatly improved solid content relative to acrylic polyurethane in the prior art, at the same time low viscosity is maintained, and the volatile organic compound (VOC) emission is reduced and the environment is protected.

Description

technical field [0001] The invention relates to a coating used for various surface coatings, in particular to a low-viscosity and high-solid acrylic polyurethane coating and a preparation method thereof. Background technique [0002] At present, most domestic acrylic polyurethane coatings are mainly based on a solid content of 55% to 60%. The production and use of such coatings have the defects of high VOC emissions and serious environmental pollution. The reasons why the mass solid content or volume solid content of this type of coating cannot be increased are as follows: 1. The main resin is mostly acrylic resin with a mass solid content of 55%~60% as raw material. Of course, there are also high solid acrylic resins, but The viscosity of the lacquer is high, and a large amount of diluent still needs to be added to meet the process requirements during actual production. In this way, the high solid gold content cannot be guaranteed; 2. Since the production and construction ...

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Problems solved by technology

[0002] At present, most domestic acrylic polyurethane coatings are mainly composed of 55% to 60% solid content. The production and use of such coatings have the defects of high VOC emissions and serious environmental pollution.

The reasons why the mass solid content or volume solid content of this type of coating cannot be increased are as follows: 1. The main resin is mostly acrylic resin with a mass solid content of 55%~60% as raw material. Of course, there are also high solid acrylic resins, but The viscosity of the paint is high, and a large amount of diluent still needs to be added to meet the process requirements in actual production

In this way, the high solid gold content cannot be guaranteed; 2. Since the production and construction must adjust the mixed component to a suitable viscosity before grinding or spraying construction, etc., if the component is changed by expanding its volume, the volume solid content will be changed. It will bring serious construction problems, which may lead to large-area anti-corrosion failure or even powdering and falling off of the coating.

3. Due to the problem of the main resin content of this kind of coating, which leads to the disadvantages of production, most enterprises boldly use various additives to thicken in order to avoid the problem of primary film thickness and surface state, which in turn leads to serious leveling problems, resulting in a series of unforeseen defects such as topcoat orange streaks

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