Rutile titanium dioxide - STS Group Chemical

Rutile titanium dioxide

Rutile titanium dioxide (TiO2) is a colorless crystalline solid. Despite its colorlessness, in large quantities titanium dioxide is an extremely effective white pigment if it is well cleaned. TiO2 practically does not absorb any incident light in the visible spectrum. Light is either transmitted or refracted through a crystal or reflected on surfaces. TiO2 is a stable (the most stable of all known white pigments), non-volatile, insoluble in acids, alkalis and solutions under normal conditions. Titanium dioxide is highly reactive to various compounds, including toxic ones contained in the air. Due to its inertness, titanium dioxide is non-toxic and, in general, is considered a very safe substance. It can come into contact with products in a package, and in certain concentrations it can also be used as a food coloring.
Titanium dioxide does not dissolve in water and dilute mineral acids (except hydrofluoric) and dilute alkali solutions.

Pigment titanium dioxide exists in two forms – anatase and rutile, and is produced according to two technological schemes: sulfate and chlorine methods. Both forms can be produced by any of the methods.
Compared to the sulfate, the chlorine method is more environmentally friendly and perfect due to the ability to carry out the process in a continuous mode, which involves complete automation of production. However, the chlorine method is selective for raw materials, and due to the use of chlorine and high temperatures, it requires the use of corrosion-resistant equipment.
Titanium dioxide, TiO2, is a compound of titanium with oxygen in which titanium is tetravalent. White powder, yellow when heated. It occurs in nature mainly in the form of the rutile mineral. Melting point – 1855 ° С, boiling point – 2500-3000 ° С. Density 3.9 – 4.25 g / cm³. Practically insoluble in alkalis and acids, with the exception of HF. In concentrated H2SO4 it dissolves only with prolonged heating. When titanium dioxide is fused with caustic or carbonic alkalis, titanates are formed, which are easily hydrolyzed to form Ti (OH) 4 orthotitanic acid (or hydrate) in the cold, which is readily soluble in acids. When standing, it passes into Mstatitanic acid (form), which has a microcrystalline structure and is soluble only in hot concentrated sulfuric and hydrofluoric acids. Most titanates are practically insoluble in water.
The main properties of titanium dioxide are more pronounced than acidic, but salts in which titanium is a cation also hydrolyze to a large extent to form the divalent titanyl radical TiO2 +. The latter is included in the composition of salts as a cation (for example, titanyl sulfate TiOSO4 • 2H2O). Titanium dioxide is one of the most important compounds of titanium; it serves as a starting material for the production of its other compounds, as well as partially metallic titanium. It is used mainly as a mineral paint, in addition, as a filler in the production of rubber and plastic metals. It is part of refractory glasses, glazes, and porcelain masses. Artificial gemstones are made from it, bicolor and dyed.
TiO2 is one of the most important inorganic compounds consumed by modern industry, the unique properties of titanium dioxide determine the level of technological progress in various sectors of the world economy.
Pigment titanium dioxide is the most sought-after product on the world market. The global volume of its production is 4.5 million tons.

Rutile or anatase?

TiO2 – occurs in nature in three main crystalline forms: antase, rutile and brookite, the latter is rare in nature and is not of commercial interest. Rutile dioxide scatters light about 30% better (better hiding power) than anatase, so the latter is used much less often. In addition, anatase is less weather resistant than rutile. Anatase works much worse in protecting the polymer (acrylate, plastic) from UV rays and leads to photocatalysis (destruction of the material under the influence of sunlight) and loss of polymer properties (degradation, fading, chalking, etc.).

Thus, it is the rutile form of titanium dioxide that is the only and non-alternative white pigment in standard industries (paints, plastics, paper) to give whiteness, hiding power (pigment count in grams to cover 1 sq. M of contrast surface) and stability pigment + carrier system. The only reasonable use of anatase titanium is road marking paints. In this type of Karsky, some specific properties of this form are manifested.

 

Properties and technology

Titanium dioxide is widely used in the manufacture of polymer products. This material has long been known as an excellent white pigment, and it is in this quality that it is familiar to most people …
At the same time, titanium dioxide brought to the polymer industry not only the ability to obtain sparkling white surfaces. By its nature, titanium dioxide is a photoactive material, and just this ability to interact with light gives it special value. For example, such an interaction can take the form of ordinary light scattering, which ensures the opacity of the material, or the form of absorption of energy from the ultraviolet light spectrum, which protects the polymer from degradation under the influence of ultraviolet radiation. The effect of the interaction of particles of titanium dioxide with light continues to find more and more widespread application in practice.
Against the backdrop of the emergence of a wide variety of options for the practical use of titanium dioxide, its pigment properties continue to remain of paramount importance. Titanium dioxide is considered the main white pigment in the polymer industry. It is widely used because it effectively scatters visible light, thereby imparting to the plastic product in which it is contained, whiteness, brightness and opacity. The substance is chemically inert, does not dissolve in polymers and is characterized by high heat resistance under the most severe processing conditions. Industrial titanium dioxide is supplied in two crystalline versions, referred to as anatase and rutile. When choosing between them, rutile pigments are preferred, since they better diffuse light, are more stable, and contribute less to photodestruction.
There are practically no industrially produced pigments made from pure titanium dioxide. Most of them have an inorganic, and in some cases organic treatment, applied to the surface of TiO2 particles by precipitation, mechanical stirring, or some other method. Such methods of surface treatment lead to the improvement of one or even several operational properties of the pigment, which include ease of dispersion, resistance to weathering, or color fastness. A universal method of surface treatment has not yet been found that would allow obtaining the pigment that is most suitable for any practical applications, so the goal of ongoing research is to continue to develop new grades of titanium dioxide that would meet the ever-changing requirements of the plastics industry.
Light-scattering properties: titanium dioxide provides hiding power by scattering light.

Unlike color pigments, which provide hiding power by absorbing certain wavelengths of the visible light spectrum, titanium dioxide and other white pigments achieve this by scattering light. The scattering effect in this case is possible due to the fact that the white pigment refracts light. If there is a sufficient amount of pigment in the composition, then all the light falling on its surface, with the exception of a small part, which is absorbed by the polymer or pigment, will be scattered outside, and the composition will look white and opaque. Light scattering is accompanied by refraction and diffraction of light rays when they pass through or near pigment particles.

 

STS Group specializes in the wholesale supply of titanium dioxide.

You can always buy titanium dioxide in bulk at a good price on order or from the warehouse of our company.

We are able to arrange the supply of titanium dioxide, according to the needs of your production with strict adherence to delivery dates, product quality and at a fixed price.

The group of our companies includes a logistics operator, thanks to which we deliver by any means of transport to all regions of Russia and the CIS countries at the lowest rates for the transportation of products.

Shipping cost depends on the batch size, type of packaging and city of delivery.

STS Group customers always receive the highest quality products at the best prices.