High-gloss aqueous modified polyurethane finish coat and preparation method thereof

Abstract

The invention discloses a high-gloss aqueous modified polyurethane finish coat. The finish coat comprises the following components in percentage by weight: 40-53% of aqueous polyurethane dispersoid, 15-25% of an epoxy modified acrylic emulsion, 12-16% of medium chrome yellow, 5-10% of nanometer barium sulfate, 0.2-0.3% of an aqueous dispersing agent, 0.1-0.2% of an aqueous foam inhibitor, 0.1-0.2% of an aqueous antifoaming agent, 0.2-0.3% of an aqueous flatting agent, 0.1-0.2% of an aqueous wetting agent, 0.6-1% of a neutralizer, 0.5-1% of hydrated magnesium silicate, 0.2-0.4% of an aqueous rheologic addition agent, 0.3-0.5% of an antimildew disinfectant, 6.8-10.7% of deionized water and 1-2% of a film forming addition agent. The coat disclosed by the invention adopts traditional aqueous polyurethane for modifying epoxy acrylic acids, so that the purposes of obviously strengthening gloss and antiseptic property are realized, and the coat can be widely used for industries of various tower cranes, steel structures, bridges, machinery, machine tools and the like. The product of the coat has the advantages of high drying speed, high hardness, high gloss (wherein the gloss can reach more than 91%), excellent fullness, good weather resistance and good excellent water resistance, and the salt mist resistant property can reach more than 1000 hours.

Description

technical field

[0001] The invention relates to the field of paint making, in particular to a high-gloss water-based modified polyurethane topcoat and a preparation method thereof. Background technique

[0002] Under the pressure of smog, the National People's Congress revised the Environmental Protection Law for the first time in 25 years. The revision of the "Environmental Protection Law" was passed, which increased the punishment of large polluters. The amendment clearly stipulates that polluting enterprises can be punished according to the original The amount is continuously punished on a daily basis. According to statistics from the Shuwei department, during the use of domestic paints, as many as 7 million tons of organic volatiles are emitted into the atmosphere every year, and the degree of pollution to the atmosphere is staggering. It can be seen that the market for water-based paints will have a very large market in recent years. Great growth. The existing metal a...

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