Zinc oxide manufacturer: What is the role of zinc oxide in coatings?

2020-06-23

Zinc oxide is an alkaline compound that reacts with a small amount of free fatty acid to form zinc soap. Zinc soap thickens the coating and dissolves when it encounters inorganic acid or acetic acid.

　　 Zinc oxide It is an alkaline compound that reacts with a small amount of free fatty acids to form zinc soap. Zinc soap thickens the coating and dissolves when it encounters inorganic acids or acetic acid.
 
　　 Zinc oxide It has a high refractive index, absorbs ultraviolet light, has strong coloring power and covering power, but the color is pure white, not powdery, and has good light resistance and heat resistance. It can form coordination compounds with carboxylate ions in coatings, reducing the sensitivity of coatings to water. Therefore, zinc oxide can improve the weather resistance and anti-chalking ability of coatings, making it suitable for exterior wall coatings.
 
 
　　Generally speaking, small-particle-size, high-purity indirect zinc oxide is used for ceramics, cans and barrel coatings; for interior coatings and emulsion coatings, acicular direct Zinc oxide is widely used, giving it a higher oil absorption value and improved suspension performance.
 
　　 Zinc oxide It can make the product coating soft, firm and waterproof, thus preventing metal corrosion. However, it should not be mixed with substrates containing more free acid to avoid producing more zinc soap, which will make the coating sticky and difficult to brush.
 
　　In addition, zinc oxide is also used in anti-corrosion or marine coatings, forming a dense zinc titanate compound to reduce the further penetration rate of corrosive media. It mainly plays a rust prevention role. In addition, it also has mildew resistance and can inhibit the growth of microbial fungi.
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