Zinc oxide is an alkaline compound that can act with trace free fatty acids to produce zinc soap, which has a tendency to thicken paints and will dissolve when exposed to inorganic acids or acetic acid.

　　Zinc oxide is an alkaline compound that can act with trace free fatty acids to produce zinc soap, which has the tendency to thicken the paint and will dissolve when it meets inorganic acid or acetic acid.

Zinc oxide has a high refractive index, with the ability to absorb ultraviolet light, and its coloring power and covering power, but the color is pure white, not chalking, with good light resistance, heat resistance; it can form coordination compounds with the carboxylate ions in the paint so as to reduce the sensitivity of the water in the coating film, so the zinc oxide can improve the weathering and chalking resistance of the film ability to adapt to the external wall coatings.

In general, ceramics, cans and buckets of paint are used with small particle size, high purity of indirect method of zinc oxide; interior paint, latex paint is mostly used in needle-shaped direct method of zinc oxide, so that the oil absorption value is higher, can improve the suspension properties.

Zinc oxide has made the product coating film flexible, firm, impervious to water, thus preventing metal rust. However, it should not be mixed with more free acid base material, so as not to produce more zinc soap, so that the paint is sticky and not easy to paint.

In addition, zinc oxide is used in anti-corrosion or marine coatings, which can form dense zinc-titanium compounds and reduce the speed of further penetration of corrosive media. It mainly plays the role of rust prevention. And it has anti-mold properties and can microbial fungi growth.