Opacity refers to the ability of a pigment in a coating to cover the surface of the surface of the object being coated when it is coated with a coating, so that the background color can no longer be transmitted through the coating.
Opacity = pigment mass (g) / surface area of ​​coated object (cm 2 )
The greater the hiding power of the pigment, the smaller the value. The main factors affecting the hiding power of pigments are as follows:
1) The refractive index of the crystal itself.
The refractive index of titanium dioxide is the highest among white pigments, so its refractive index is theoretically the highest.
2) The size of the pigment particle size and the degree of dispersion of the particle structure also affect the hiding power.
In the range of wavelengths larger than the half wavelength of visible light, the finer the particle size, the smoother the particle structure, and the better the dispersibility, the greater the hiding power, but it has a certain limit. When the average particle size is 0.2 um, the hiding power is the largest. When it is less than half of the wavelength of visible light, the hiding power is decreased due to the transparency of the crystal grains to light. It is not good because the visible particles are too large or too small.
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