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Molecular formula：O2Ti
Physicochemical properties: white amorphous powder; Odorless and tasteless Insoluble in water, hydrochloric acid, dilute sulfuric acid, ethanol and other organic solvents, slowly soluble in hydrofluoric acid and hot concentrated sulfuric acid.
Using the opacity of titanium dioxide can improve the decorative effect of food and pharmaceutical products. In addition to excellent pigment properties, titanium dioxide for food and medicine has very strict requirements for purity and harmful impurity content.
In all applications of pigment titanium dioxide, the amount of coating is the largest. Titanium dioxide is widely used in coatings, such as buildings, automobiles, ships, furniture, household appliances, coil coating, toys and daily necessities. In the coating industry, architectural coatings consume the most titanium dioxide, followed by coatings for automobiles, ships, railway vehicles and furniture. Because rutile titanium dioxide has better performance than anatase titanium dioxide, rutile titanium dioxide is selected as high weatherability coating for outdoor use of ships, bridges, automobiles, buildings and so on. At present, rutile titanium dioxide has exceeded that of titanium dioxide used in coatings. With the development of China's automobile industry and construction industry, the coating industry not only needs more titanium dioxide in quantity, but also has higher requirements for variety and quality.
The plastic industry is the second largest user of titanium dioxide. In order to make plastics have beautiful colors, a certain amount of pigments are often added to plastics. Titania is required that the added pigments are easy to stain and disperse during the processing, and do not react with other components in the plastic. Because titanium dioxide has the characteristics of high whiteness, strong achromatic power, large hiding power and good chemical stability, adding titanium dioxide to plastic can improve the heat resistance, light resistance and weather resistance of plastic products, improve the physical and chemical properties of plastic products, enhance the mechanical strength of products and prolong the service life.
Titanium dioxide is mainly used as filler in paper industry. Titanium dioxide for papermaking generally uses anatase titanium dioxide without surface treatment, which can play the role of fluorescent brightener and increase the whiteness of paper. However, the laminated paper requires the use of rutile titanium dioxide with surface treatment to meet the requirements of light resistance and heat resistance. Because titanium dioxide has high refractive index and achromatic power, adding titanium dioxide to pulp can make the paper have better whiteness, higher opacity, good gloss, high strength, thin and smooth, nonpenetration during printing, and light weight.
Titanium dioxide is mainly used as a matting agent in the chemical fiber industry. Titanium dioxide has high refractive index, strong coloring power, large hiding power, good dispersion, high whiteness, fine and uniform particles, good chemical stability, not easy to change, does not affect the tension and dyeing of fibers, and has good light resistance and weather resistance. Titania is an excellent matting agent. Although the refractive index of rutile titanium dioxide is higher than that of anatase titanium dioxide, its atomic arrangement is dense, its hardness is greater than that of anatase titanium dioxide, and titania is easy to wear spinnerets and wire cutters. Therefore, anatase titanium dioxide without surface treatment is usually used as the matting agent of chemical fibers. Only when some special varieties in order to reduce the photochemical effect of titanium dioxide and avoid the degradation of fibers under the photocatalysis of titanium dioxide, the surface treated titanium dioxide is used.
Titanium dioxide has the characteristics of good whiteness, small and uniform particle size, high refractive index, high coloring power and hiding power, good physical and chemical stability, light diffusion, light resistance, heat resistance, weather resistance and hydrophobicity, which make titania not only an indispensable white pigment in ink manufacturing, but also a necessary raw material for blending many intermediate color ink products. The ink containing titanium dioxide is durable, does not change color, has good surface wettability, and is easy to disperse. Titania used in the ink industry has rutile type and anatase type.
Titanium dioxide is not only used as a colorant in the rubber industry, but also has the functions of filling, anti-aging, acid and alkali resistance and reinforcement. When titanium dioxide is added to white and light colored rubber products, the finished products have the characteristics of slow aging, high strength, no cracking, no fading, large elongation and acid and alkali resistance. Titania for rubber is mainly used in automobile tires, rubber shoes, rubber floors, gloves, sports equipment, etc. Titania is generally anatase type. However, when used in the production of automobile tires, a certain amount of rutile products are often added in order to enhance its ozone and ultraviolet resistance.
Titanium dioxide in the electronic industry is mainly used to manufacture ceramic capacitors, piezoelectric ceramics, transparent electro-optic ceramics and other electronic components required for electronic ceramic materials, one of the important raw materials. Titanium dioxide for electronic ceramics requires fine particles, large specific surface area, high reduction resistance, high dielectric constant and resistance, high purity and less impurities. Therefore, titania for capacitors or reagents is usually used in the electronic industry.
Enamel is a product obtained by painting a layer of enamel on the metal embryo and then melting. The glaze must have opacification. Titanium dioxide is the strongest opacifier in the glaze. The glaze made of titania has strong transparency, light weight, strong impact resistance, good mechanical properties, bright colors, and is not easy to be polluted.
The electrode is composed of welding core and coating. Titanium dioxide is one of the main raw materials of electrode industry. Titanium dioxide, as the most important raw material in the coating, is not only a good slagging agent, diluent, deoxidizer, but also an excellent viscoplastic agent and arc stabilizer.
The electrode with titania as the coating can be used for both AC and DC, and has the characteristics of fast arc ignition, stable arc, no splashing, low melting point of slag, low viscosity, good fluidity, easy slag removal after welding, beautiful weld and good mechanical properties.
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