Aqueous finishing coat

Abstract

The invention discloses an aqueous finishing coat. The aqueous finishing coat is composed of a component A and a component B, wherein the component A is composed of the following components by weight percent: 55-85% of aqueous acrylic emulsion, 5-25% of tinting color, 0.5-2.5% of dispersant, 0.5-2% of defoaming agent, 0.5-2% of base material humectant. 0.5-1% of flatting agent, 0.1-0.5% of rheological additive, 0.1-0.5% of catalyst, 0.5-1.5% of light stabilizer and the balance of deionized water; the component B is an aqueous firming agent; and the weight ratio of the component A to the component B is (2-6) to 1. The aqueous finishing coat provided by the invention realizes the aquosity of the finishing cost for a car coating and the amount of the contained harmful substances is obviously reduced; the harmful substances, such as benzene, toluene, dimethylbenzene, ethylbenzene and the like, are not detected; and the content of VOC (Volatile Organic Compounds) is greatly reduced and the content of the free formaldehyde is obviously reduced. The aqueous finishing coat provided by the invention has the advantages of reducing the pollution on the environment and also improving the work environment of the coating operating personnel.

Description

technical field [0001] The invention relates to the technical field of automobile coatings, in particular to a water-based finish paint. Background technique [0002] Over the past 30 years, my country's automobile industry has developed rapidly, especially in the last 20 years, the automobile industry has shown a blowout rapid growth. In 2009, the total output of automobiles nationwide reached 13.79 million, and the number of automobiles has reached 76.19 million. The great development of the automobile industry has also led to the development of automobile coating technology. At the same time, automobile coatings have also made great progress. [0003] At present, my country's automotive coatings are still dominated by solvent-based systems, which contain a large amount of volatile organic compounds (VOC), which pollute the environment very seriously. Since the 1960s, in order to protect the living environment of human beings, countries around the world have enacted rele...

AI Technical Summary

Problems solved by technology

Because large passenger cars, car repair coatings, and plastic parts coatings cannot withstand high-temperature baking, low-temperature drying is generally used, that is, drying at 60-80°C or self-drying at room temperature. Therefore, acrylic polyurethane two-component coatings are usually used at present. For example, domestic buses and coaches are all equipped with solvent-based epoxy antirust paint, solvent-based acrylic polyurethane or polyester polyurethane primer, and solvent-based acrylic polyurethane topcoat. Water-based technology is still blank

Although there are a small number of foreign countries that use water-based technology to paint buses and buses, it is difficult to achieve high-gloss and high-reflection coating effects. Therefore, water-based semi-gloss or matte solid color paint and solvent-based high-solid paint are generally used Varnish varnish supporting coatings, which are still semi-aqueous in nature

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