Following the previous topic, manufacturers generally wrap titanium dioxide to help them wear "clothes", the most common are the followings

- Alumina coating

- Silicon dioxide coating

- Zirconia coating

So, what are the differences between these "clothes" wrapped in titanium dioxide, and what kind of impact will they have on titanium dioxide?

- Alumina coating

Alumina film belongs to the inorganic surface treatment of titanium dioxide surface treatment method. Generally, it is through precipitation and adsorption, coating one or more layers of inorganic hydrate oxide film on the surface of titanium dioxide particles. Inorganic surface coating can block the crystal defects of titanium dioxide, thereby improving the weather resistance of titanium dioxide particles.

- Silicon dioxide coating

In the titanium dioxide slurry, water-soluble silicon compounds are added, and then the pH value is adjusted with acids to be 8-9, at this time the silicon compound reacts with the acid and precipitates on the surface of the titanium dioxide particles, so that the thickness of the envelope is basically uniform, the structure is dense, and continuous, not porous sponge-like.

- Zirconia coating

Using sodium hexametaphosphate as the dispersant, the rutile titanium dioxide is coated with zirconia. Effectively shield its photochemical activity, make its chemical properties stable, improve its adsorption, dispersion, and weather resistance.

In inorganic treatment, only a metal hydrated emulsion or hydroxide is used as a coating agent, and the improvement of the anti-chalking and photosensation of titanium dioxide is limited, therefore, many on the market are, combined with silicon oxide, alumina (that is, silicon aluminum or zirconium aluminum coating) can obtain significant effects, enhance the performance of titanium dioxide in all aspects.

Thus, titanium dioxide in pigments, coatings, inks, plastics and many other industries, stable play its chemical properties, so that the final product with white, brighter, more translucent.