Technology | How to improve the performance requirements of anatase titanium dioxide?

Anatase titanium dioxide is a commonly used white pigment in the coating industry and has excellent performance in all aspects.
However, the purity, dispersibility, hiding power and other aspects are also affected by many factors, so how to improve the performance requirements of anatase titanium dioxide?1.
How to improve the whiteness of anatase titanium dioxide? 1.
How to improve the whiteness of anatase titanium dioxide? Through experimental tests, the main factors for the whiteness of anatase titanium dioxide are: hydrolysis quality, impurity elements and calcination conditions.
At present, in China, there are two types of hydrolysis technology for anatase titanium dioxide: pressure hydrolysis and normal pressure hydrolysis.
From the perspective of hydrolysis quality and product quality, the hydrolysis quality under normal pressure is better, and the hydrolysis particle size is uniform.
If you want to ensure the quality of the hydrolysis, you must control the quality index of the concentrated titanium solution, control the ratio of iron to titanium and the solid content within the specified range, and increase the control of the operating conditions of the hydrolysis process.

In addition, impurity and colored elements are also important factors affecting the whiteness of anatase titanium dioxide, such as iron, cobalt, nickel, etc.
Therefore, measures must be taken to remove colored elements.
For anatase titanium dioxide, when the high iron content is higher than 120ppm When, it will directly affect the whiteness, and even the phenomenon of light and color mutual change.
Bleaching technology can be used to increase the washing power of high-speed iron, or add antimony trioxide and phosphoric acid, etc.
, to complex and mask the iron and reduce the influence of impurity elements on the whiteness of anatase titanium dioxide.

The control of calcination conditions is an important part of titanium dioxide crystal nucleation.
A good calcination temperature can desulfurize and dehydrate the anatase titanium dioxide completely, and try to avoid the lattice defects of the anatase titanium dioxide crystal nucleus, thereby affecting its BaiDu.
Therefore, the control of key temperature points is increased, and at the same time, the feed rate and the kiln body speed are reasonably matched, and the combustion chamber is increased to avoid the contact between the material and the flame and the occurrence of sintering.

2.
How to improve the dispersibility and hiding power of anatase titanium dioxide? 2.
How to improve the dispersibility and hiding power of anatase titanium dioxide?
The particle size distribution of anatase titanium dioxide directly affects the performance and application performance of anatase titanium dioxide.
Therefore, the improvement of hiding power and dispersibility can be studied from the particle size distribution.

The influencing factors of the particle size distribution of titanium dioxide are more complicated.
The first is to hydrolyze the size of the original particle size.
By controlling and adjusting the conditions of the hydrolysis process, the original particle size is within a certain range.
The second is the calcination temperature.
During the calcination process of metatitanic acid, the particles undergo a crystalline transformation period and a growth stage, and the appropriate temperature is controlled to keep the grown particles within a certain range.
Finally, the product is crushed.
The Raymond mill is usually modified and the analyzer speed is adjusted to control the crushing quality.
At the same time, other crushing equipment such as universal mills, jet mills and hammer mills can be used.3.
How to improve the application performance of anatase titanium dioxide? 3.
How to improve the application performance of anatase titanium dioxide?
Anatase titanium dioxide Anatase titanium dioxide is a highly dispersible powder, which is hydrophilic and oil repellent in nature.
However, if the surface layer absorbs air, water and other substances, the dispersibility in water will be reduced, and frequent For surface treatment, the commonly used modifiers are hydrated alumina and hydrated silica.
There are also many surface modifiers on the market, such as silicones, coupling agents, etc.
, for treatment.
Or add some other inorganic pigments such as: barium sulfate, aluminum hydroxide, etc.
to improve the surface characteristics of anatase titanium dioxide and improve its dispersibility.