What is titanium dioxide? Why is a dispersant so important to titanium dioxide?

What is titanium dioxide?

Titanium dioxide is a non-toxic inorganic pigment with excellent whiteness and brightness and strong hiding power. It is one of the best white pigments in the world. It is widely used in coatings, plastics, rubber, paper, chemical fiber inks. Industrial fields such as cosmetics.

Zhengzhou Yucai Phosphate Chemical Plant sodium hexametaphosphate Spot

The importance of dispersants for titanium dioxide

Since titanium dioxide has good photochemical activity, when it is exposed to visible light or ultraviolet light, it can oxidize the organic compound in contact with it, causing degradation of the organic compound in contact with it, brittle cracking and powdering. Therefore, in the industrial production, titanium dioxide is generally surface-treated, that is, coated with an inorganic oxide to compensate for this defect of titanium dioxide. Before the surface treatment, the titanium dioxide is firstly dispersed and pulped, and the dispersibility of the obtained slurry directly affects the surface treatment effect of the titanium dioxide. If the titanium dioxide particles are not well dispersed, not only can it be continuously and uniformly coated, but also the scattering of light by the pigment particles, thereby reducing the optical properties and pigment properties of the pigment, and possibly even in the subsequent jet milling process. The coating is damaged, thereby affecting the weatherability of the pigment. Therefore, it is especially important that the titanium dioxide is selected as a dispersant before surface treatment.

The best dispersant for titanium dioxide - sodium hexametaphosphate

Zhengzhou Yucai Phosphate Chemical Factory.
Sodium hexametaphosphate produced by Yucai Phosphate Chemical Plant is a linear polyphosphate glass body. The surface of titanium dioxide particles is adsorbed to form an electric double layer, which increases the Zeta point of the particles, so that the particles cannot be mutually disabled due to charge repulsion. Contact with each other and remain suspended in the slurry. Sodium silicate changes the dispersibility by changing the pH of the slurry. Polyethylene glycol and sodium dodecylbenzene sulfonate do not improve the dispersibility by increasing the potential of the surface of the particles. Instead, the hydroxy group on the surface of the molecule adsorbs with the surface of the titanium hydride to form a solvation layer, which is ultimately prevented by the steric hindrance effect. Flocculation between particles. Therefore, the best dispersing agent for titanium dioxide before surface treatment is sodium hexametaphosphate produced by Yucai Phosphate Chemical.