Titanium dioxide is a bright white powder that has many uses, especially in the field of glossy plastic paints. It is considered one of the types of opaque pigments that block light when combined with paints. It gives the surface a white color and hides defects. One of the most important features of titanium is that it is a basic material in glossy paints. It does not affect the degree of gloss of the binding materials. Titanium also protects the painted surface from ultraviolet rays and the harmful effects of the sun. Titanium dioxide or TiO2 has excellent light scattering properties and is used in paints to add whiteness, coverage strength, brightness and color durability that cannot be achieved using any other raw material. The best type of titanium used in the field of paints is titanium treated with chlorine.
Titanium dioxide or titanium dioxide or titania is a naturally occurring oxide of titanium, so it is called white titanium. It is an inactive compound that is not affected by solvents, acids or alkalis, and does not affect the paint medium during storage. It exists in two crystalline forms, rutile and anatase. Rutile is the most widely used and of the highest quality due to its strong coverage and non-crystalline properties. Titanium dioxide is famous for its many uses, from paint and sunscreen to its use in food coloring. When used as a food coloring, it has the number E171.
Titanium dioxide pigments are divided into two types: anatase and rutile. According to international standards, they are called type R and type A, respectively. The rutile and anatase types without post-treatment are called type RI and type AI, respectively; the rutile and anatase types after post-treatment are called types R2, R3 and A2, respectively. At present, most of the rutile titanium dioxide on the market belong to the R2 and R3 types, where the R2 type accounts for more than 70% of sales, while the R2 and R3 account for 77% and 22% of the rutile titanium dioxide for coating, respectively.
Performance and use of titanium dioxide pigment:
The titanium dioxide based on has high refractive index, strong chromatic strength, great hiding power, good dispersion, good whiteness, non-toxic and stable physical and chemical properties, excellent optical and electrical properties, so it has a wide range of uses, paint, plastic, paper, chemical fiber, ink, rubber, cosmetics, etc., all use titanium dioxide, with paints accounting for about 57% in particular, and rutile titanium dioxide is mostly consumed in the coating industry.
The refractive index of rutile titanium dioxide is 2.76, and the refractive index of anatase titanium dioxide is 2.55. The hiding power is determined by the difference between the refractive index of the pigment and the refractive index of the medium. The refractive index of rutile titanium dioxide is 25% to 30% higher than that of anatase titanium dioxide, which means that if it produces the same hiding power as anatase titanium dioxide, the amount of rutile titanium dioxide can be reduced by 25% to 30%. In addition, rutile titanium dioxide has a compact structure, relatively stable, low photochemical activity, UV resistance, and has better weather resistance and gloss than anatase titanium dioxide, so it is widely used in various high-quality weather-resistant exterior coatings for high-end ships, bridges, automobiles and buildings, accounting for about 70% of the coating. Anatase and yellow titanium dioxide are generally only used for interior coatings, and the amount only accounts for 30% of the titanium dioxide used in coatings
