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Six Functions of Zinc Oxide in Powder Coatings


Published:

2022-11-25

Zinc oxide is a white pigment, also called zinc white. Because its coloring power is smaller than that of titanium dioxide, it can be used more when zinc oxide is used to replace titanium dioxide when titanium dioxide varnish is needed for color mixing. The utility model makes the color paste weighing convenient, the adjustment easy and accurate, and the color sensitivity is reduced.

1. As white pigment and filler at the same time

Zinc oxide is a white pigment, also called zinc white. Because its coloring power is smaller than that of titanium dioxide, it can be used more when zinc oxide is used to replace titanium dioxide when titanium dioxide varnish is needed for color mixing. The utility model makes the color paste weighing convenient, the adjustment easy and accurate, and the color sensitivity is reduced.

2. A little is used in epoxy resin containing carboxyl functional groups to improve the characteristics of the coating.

Zinc oxide is slightly alkaline, which can reflect with the carboxyl functional groups in epoxy resin to form zinc soap to improve the flexibility and strength of the coating, and the coating is cleaner than titanium white as the color paste.

3. Promote the reaction between epoxy group and carboxyl group.

In epoxy resin/polyester, polyester/TGIC and other electrostatic powders, the carboxyl reaction of epoxy reaction is accelerated, the catalytic reaction is dry and solid, and the setting time is reduced.

4. As conductive functional filler

Anti static or conductive static electricity must be used in some industrial applications. As a metal oxide, zinc oxide has a certain conductivity, so it is widely used as conductive filler in this building coating

5. It has the function of shielding ultraviolet light

Zinc oxide is a reasonable and cheap white light stabilizer. Especially, it has good safety protection ability for UV light in the range of 240-380nm. It is often used for electrostatic powder, especially for outdoor electrostatic powder with better UV light shielding ability, which can increase the service life of the coating.

6. It has the function of removing mold and bacteria

Zinc oxide has a strong ability to remove bacteria, which is used in water soluble architectural coatings. It also has the practical effect of removing mold when used in electrostatic powder.

key word:

Zinc Oxide

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