The whiteness of the white pigment of titanium dioxide paint is very important and is one of the key quality indicators required by the coating. The poor whiteness of titanium dioxide will directly affect the appearance of the coating film. The main factor affecting the whiteness of titanium dioxide is the type and content of harmful impurities, because titanium dioxide is very sensitive to impurities, especially rutile titanium dioxide.
The hiding power is the surface area of the coated object per square centimeter. When it is completely covered, the same area is painted. The greater the hiding power of the titanium dioxide paint used, the thinner the coating film and the less the amount of paint required, and the smaller the amount of titanium dioxide required. If the hiding power of titanium dioxide decreases, the amount of titanium dioxide required to achieve the same hiding effect increases, the production cost will increase, and the increase in the amount of titanium dioxide will cause the titanium dioxide to be difficult to disperse uniformly in the coating, and aggregation occurs, which will affect the covering effect of the paint.
TiO2 coating has high requirements for the weather resistance of titanium dioxide, especially for outdoor surface coatings, which require titanium dioxide with high weather resistance or ultra-high weather resistance. Using titanium dioxide with low weather resistance, the coating film will have problems such as fading, discoloration, chalking, cracking, and peeling. The main method to improve the weather resistance of titanium dioxide is to perform inorganic surface treatment, that is, to coat the surface of titanium dioxide particles with one or more layers of inorganic oxides or hydrated oxides.
Titanium dioxide is ultra-fine particles with large specific surface area and high surface energy. It is easy to aggregate between particles, and it is difficult to stably disperse in coatings. The poor dispersion of titanium dioxide will directly affect its optical properties such as color reduction, hiding power and surface gloss in the coating, and also affect the storage stability, fluidity, leveling, coating durability, and corrosion resistance of the coating. Application properties such as electrical conductivity and conductivity will also affect the production cost of coatings, because the energy consumption of grinding and dispersion operations is high, accounting for most of the total energy consumption of the coating manufacturing process, and the loss of equipment is large.