Lithopone is also known as zinc bismuth white. The English name Lithopone is a non-toxic white powder. It is insoluble in water. It is liberated from vulcanization by acid action. It does not work with hydrogen sulfide and alkali. It has good heat resistance and can improve weather resistance. Anti-algae, reducing cost and its whiteness with excellent hiding power. Lithopone is a white pigment, a mixture of zinc sulfide and barium sulfate.
Physical properties of lithopone
1, relative density
Among the commonly used white pigments, the relative density of lithopone is the smallest, and in the white pigment of the same quality, titanium dioxide has the largest surface area and the highest pigment volume.
2, melting point and boiling point
Since the anatase type is converted to a rutile type at a high temperature, the melting point and boiling point of the anatase type titanium dioxide are practically absent. Only the rutile type titanium dioxide has a melting point and a boiling point, the rutile type titanium dioxide has a melting point of 1850 ° C, the air has a melting point of (1830 ± 15) ° C, and the oxygen-rich melting point is 1879 ° C. The melting point is related to the purity of the titanium dioxide. The rutile type titanium dioxide has a boiling point of (3200 ± 300) ° C, and titanium dioxide is slightly volatile at this high temperature.
3. Dielectric constant
Since titanium dioxide has a high dielectric constant, it has excellent electrical properties. When determining the physical properties of titanium dioxide, mi9k_3 should consider the crystallographic orientation of titanium dioxide crystals. The dielectric constant of anatase titanium dioxide is relatively low, only 48.
4, conductivity
Titanium dioxide has the properties of a semiconductor, its electrical conductivity increases rapidly with increasing temperature, and is also very sensitive to hypoxia. The dielectric constant and semiconductor properties of rutile titanium dioxide are very important to the electronics industry, and can be used to produce electronic components such as ceramic capacitors.
5, hardness
According to the Mohs hardness, the rutile type titanium dioxide is 6 to 6.5, and the anatase type titanium dioxide is 5.5 to 6.0. Therefore, an anatase type is used in the chemical fiber extinction to avoid abrasion of the spinning holes.
6, hygroscopicity
Although titanium dioxide is hydrophilic, its hygroscopicity is not too strong, and the rutile type is smaller than the anatase type. The hygroscopicity of titanium dioxide has a certain relationship with the surface area, large surface area, high hygroscopicity, and also related to surface treatment and properties.
7, thermal stability
Titanium dioxide is a material with good thermal stability.
8, granularity
The particle size distribution of lithopone is a comprehensive indicator that seriously affects the properties of Lide powder pigments and product application properties. Therefore, the discussion of hiding power and dispersibility can be directly analyzed from the particle size distribution.
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