Titanium dioxide is a non-toxic inorganic pigment with excellent whiteness and brightness and strong covering ability. It is one of the best white pigments in the world. And widely used in coatings, plastics, rubber, paper making, chemical fiber inks, cosmetics and other industrial fields.
Importance of Dispersant to Titanium Dioxide
Titanium dioxide has good photochemical activity. When it is exposed to visible light or ultraviolet light, it can oxidize the organic compounds in contact with it, resulting in degradation, brittle fracture and pulverization of the organic compounds in contact with it. Therefore, in the industrial production of titanium dioxide, the defects of titanium dioxide are usually compensated by surface treatment, that is, coating with inorganic oxide.
Before surface treatment, it is firstly dispersed and pulped, and the dispersity of the prepared slurry directly affects the surface treatment effect of titanium dioxide. If its particles are not well dispersed, it will not only fail to achieve continuous and uniform coating, but also affect the scattering of light by pigment particles. Thus reducing the optical properties and pigment properties of pigment. It is even possible that the coating will be damaged in the subsequent airflow crushing process, thus affecting the weather resistance of the pigment. Therefore, it is particularly important to select dispersant for it before surface treatment.
The Best Dispersant of Titanium Dioxide-Sodium Hexametaphosphate
Sodium hexametaphosphate produced by Yucai Chemical Industry is a kind of linear polyphosphate glass body. And its titanium dioxide particles are adsorbed on the surface to form an electric double layer, which increases the Zeta point of particles. Therefore, the particles can not contact each other due to charge repulsion, and remain suspended in the slurry.
Sodium silicate can change the dispersity by changing the PH value of slurry. Polyethylene glycol (PEG) and sodium dodecyl benzene sulfonate (SDS) do not improve the dispersibility by increasing the potential on the surface of particles. But form a solvation layer by the adsorption of hydroxyl groups on the molecule and titanium hydride surface. And finally prevent flocculation between particles due to steric hindrance effect. Therefore, the best dispersant for titanium dioxide before surface treatment is sodium hexametaphosphate produced by Yucai Phosphate Chemical Industry.
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