Low-voc polyurethane matte varnish and preparation method thereof

Abstract

The invention relates to a low-VOC polyurethane matt varnish and a preparation method thereof. It is prepared from components A and B at a ratio of 1:0.8-1.2. A is composed of the following components: high-solid and low-viscosity alkyd resin, dispersant , defoamer No. 1, anti-settling slurry, matting powder, leveling agent, defoamer No. 2, drier, composite environmental protection solvent; B is composed of the following components: TDI trimer, HDI trimer, acetic acid butyl ester. The beneficial effects of the present invention are as follows: it can reduce the VOC content during coating construction and achieve the purpose of exempting consumption tax; it can reduce the number of coating layers of paint, so it helps to reduce costs and save raw materials; the paint film is smooth and transparent, and improves the quality of woodenware The grade of paint.

Description

technical field [0001] The invention relates to a low-VOC polyurethane matte varnish and a preparation method thereof. Background technique [0002] In order to promote energy conservation and environmental protection, from February 1, 2015, consumption tax will be levied on paints with a volatile organic compound (VOC) content higher than 420 mg / L (inclusive) under construction. At present, the VOC content of PU wood paint coatings on the market is higher than 420 g / L, and the collection in the production, commissioned processing and import links will not only increase the cost, but also pollute the environment, making it difficult to be welcomed by consumers. On the other hand, for PU matte varnishes, the solid content is often low in construction, and the VOC content during spraying construction is basically above 600 g / L, which is much higher than the index of 420 g / L. At the same time, the paint film is easy to dry out and lack fullness Therefore, preparing a kind of l...

AI Technical Summary

Problems solved by technology

At present, the VOC content of PU wood paint coatings on the market is higher than 420 g / L, and the VOC is collected in the production, commissioned processing and import links, which not only increases the cost, but also pollutes the environment, and is difficult to be welcomed by consumers.

On the other hand, for PU matte varnishes, the solid content is often low in construction, and the VOC content during spraying construction is basically above 600 g / L, which is much higher than the index of 420 g / L. At the same time, the paint film is easy to dry out and lack fullness Therefore, preparing a low-VOC polyurethane matt varnish is a problem that technical personnel need to overcome together

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