1. Titanium dioxide is the trade name of titanium dioxide, commonly known as titanium dioxide. It has two structures: rutile type (Rutile R type) and anatase type (Anatase A type). The rutile crystal structure is compact, relatively stable, and has low optical activity, so it has good weather resistance, high hiding power and achromatic power. Therefore, it has better application performance and has more extensive applications.Titanium dioxide has stable physical and chemical properties, excellent optical, electrical properties and pigment application performance, so it has a wide range of use value. Titanium dioxide should be used as raw material in coating, chemical fiber, paper making, plastics, printing ink, enamel, welding electrode, metallurgy, electronic industry, commodity industry, etc.2. Classification of titanium dioxideAccording to the production process, it can be divided into sulfuric acid titanium dioxide and chloride titanium dioxide;According to the crystal morphology, it can be divided into anatase type and rutile type;It can be divided into pigment titanium dioxide and special titanium dioxide, etc2.1. Coating: It has bright colors, high covering power, strong coloring power, low dosage, and a wide variety of varieties. It can protect the physical stability of the medium, enhance the mechanical strength and adhesion of the paint film, prevent cracks, prevent UV and water penetration, and extend the lifespan of the paint film.2.2 Plastics: adding titanium dioxide 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 extend the service life.2.3. Paper making: Make the paper have good whiteness, good luster, high strength, thin and smooth, non penetrating during printing, and light weight. Titanium dioxide for paper making generally uses anatase titanium dioxide without surface treatment, which can act as a fluorescent whitening agent and increase the whiteness of paper.2.4 Ink: The ink containing titanium dioxide is durable and does not change color, has good surface wettability and is easy to disperse. The titanium dioxide used in the ink industry includes rutile and anatase2.5. Rubber: It not only serves as a colorant, but also has reinforcing, anti-aging, and filling effects. Add titanium dioxide into white and colored rubber products. Under sunlight, it is resistant to sunlight, does not crack, does not discolor, and has a large elongation and acid and alkali resistance. Titanium dioxide for rubber is mainly used for automobile tires, rubber shoes, rubber floors, gloves, sports equipment, etc., and it is mainly anatase. However, when used in the production of automobile tires, a certain amount of rutile products are often added to enhance their ozone and ultraviolet resistance.2.6 Cosmetics: Since titanium dioxide is non-toxic and far superior to lead white, almost all kinds of perfumes use titanium dioxide instead of lead white and zinc white. Only 5-8% titanium dioxide can be added into the fragrance powder to get permanent white, making the fragrance more smooth, with adhesion, absorption and covering power. Titanium dioxide can reduce greasy and transparent feeling in gouache and cold cream. Titanium dioxide is often used in other spices, sunscreen, soap, white soap, shaving cream and toothpaste.2.7 Textile and chemical fiber: titanium dioxide used for chemical fiber is mainly used as a matting agent. Since anatase is softer than rutile, anatase is generally used. Generally, titanium dioxide used for chemical fiber does not need surface treatment, but some special varieties need surface treatment in order to reduce the photochemical effect of titanium dioxide and avoid fiber degradation under the effect of titanium dioxide photocatalysis/ The degradation of titanium dioxide by photocatalysis requires surface treatment.