What are the uses of zinc oxide in the coatings industry?

2021-03-21

Zinc oxide is an alkaline compound that can react with a small amount of free fatty acids to form zinc soap. Zinc soap often thickens the coating and dissolves when encountering inorganic acids or acetic acid.


　　 Zinc oxide It is an alkaline compound that can react with a small amount of free fatty acid to form zinc soap. Zinc soap tends to thicken the coating and dissolves when encountering inorganic acids or acetic acid.


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　　Zinc oxide has a high refractive index and the ability to absorb ultraviolet rays. It has strong coloring power and covering power, but the color is pure white, it does not powder, and it has good light resistance and heat resistance; it can interact with carboxylates in coatings. Acid radical ions form coordination compounds to reduce water sensitivity in the coating. Therefore, zinc oxide can improve the weather resistance and powdering resistance of the coating and is suitable for exterior wall coatings.

　　Generally speaking, ceramics and canned coatings use indirect zinc oxide, which has a small particle size and high purity. Indoor coatings and latex coatings use acicular direct zinc oxide to increase oil absorption and improve suspension performance.


　　 Zinc oxide It makes the product coating soft, firm and impermeable, thus preventing metal corrosion. However, it should not be mixed with substrates with more free acid to avoid producing more zinc soap, making the coating thicker and difficult to brush.


　　In addition, zinc oxide is also used in anti-corrosion or marine coatings, which can form a dense zinc titanium compound and reduce the further penetration rate of the corrosive medium, mainly playing a rust prevention role. It has antifungal properties and can inhibit the growth of microorganisms and fungi.


　　That's all we have to explain Zinc oxide the role in coatings, hoping to help everyone.


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