best quality of titanium dioxide in China

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best quality of titanium dioxide in China

When used in paints, it provides for maximum whiteness and opacity. It gives paint high hiding power, meaning the ability to mask or hide the substrate underneath. It does this more effectively than any other white pigment.

Today, titanium dioxide pigment is by far the most important material used by the paints industry for whiteness and opacity. These unique properties are derived from the refractive index of titanium dioxide. The refractive index expresses the ability to bend and scatter light. Titanium dioxide has the highest refractive index of any material known to man, greater even than diamond. To take advantage of this property, titanium dioxide must be mined, refined and ground to a fine, uniform particle size.

Source

Nature does not yield titanium dioxide in a form that is usable as a pigment. Titanium dioxide is usually associated with iron, mostly as the mineral ilmenite. It is also mined in one of the pure forms, rutile beach sand. Deposits of titanium-bearing minerals used as the basic raw materials in the manufacture of titanium dioxide pigments can be found in many places on the earth.

Pigment manufacturers convert these raw materials to produce titanium dioxide pigments. The production of titanium dioxide pigments is basically a refinement process. This may be achieved by either the sulfate process, which uses sulfuric acid as a separating agent, or the chloride process, which works with chlorine. Once refined and developed to the appropriate particle size, the pigment may be surface treated with inorganic oxides and an organic compound to achieve better technical performance, such as easy processability or higher weather durability.

Origin and History

Titanium dioxide can refer to any pigment containing a compound of titanium. The name "Permanent White" has been applied to many pigments, including titanium dioxide whites. Such imprecise names can cause confusion and many are still used today. At the beginning of the 20th century development of titanium dioxide white pigment occurred simultaneously in Norway and the United States. Several processes were later developed and patented by companies in both countries. Use of titanium dioxide as a white pigment in artist's palettes began in field tests as early as 1916, but it wasn't until the 1940's that widespread use of the pigment began.