1. Crystal properties
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There are two stable crystal forms: rutile (Rutile-R type) and anatase type (Anatase-A type). In general, R-type titanium dioxide has better weather resistance, water resistance and resistance to yellowing, but its whiteness is slightly worse. Type A titanium dioxide has poor light resistance and weather resistance, but has good whiteness.
2. Optical properties
(1)Refractive index: determines hiding power
Titanium dioxide has a very high refractive index, the anatase type is about 2.55, and the rutile type is about 2.70.
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Different refractive index produces different covering power
The higher the refractive index, the more opaque, which means the stronger the hiding power. Because light bends more in a paint film containing high-refractive-index pigments than in a paint film containing low-refractive-index pigments, it is more difficult for light to penetrate the film.
(2) Light scattering: determines coloring power
Tinting power is the result of the absorption and scattering of light by pigments. Titanium dioxide is a white pigment that absorbs very little light. Unlike colored pigments, light absorption plays an important role. Therefore, its tinting power (achromatic power) mainly depends on its ability to scatter visible light. It has strong scattering power and high tinting power (achromatic power).
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