How to prepare titanium dioxide TiO2

Titanium dioxide is an inorganic substance with the chemical formula TiO2, a white solid or powdered amphoteric oxide with a molecular weight of 79.9, non-toxic, the best opacity, the best whiteness and brightness, and is considered to be the best performance in the world today. a white paint. Titanium dioxide has strong adhesion, is not easy to chemically change, and is always white. Widely used in coatings, plastics, paper, printing ink, chemical fiber, rubber, cosmetics and other industries. It has a high melting point and is also used to make refractory glass, glaze, enamel, clay, high-temperature laboratory utensils, etc.

At the same time, titanium dioxide has a good UV shielding effect, and is often incorporated into textile fibers as a sunscreen agent. Ultrafine titanium dioxide powder is also added to sunscreen creams to make sunscreen cosmetics.

Titanium dioxide can be extracted from rutile by acid decomposition or obtained by decomposition of titanium tetrachloride. Titanium dioxide has stable properties and is widely used as a white pigment in paints. It has good hiding power, similar to lead white, but does not turn black like lead white; it has the same persistence as zinc white. Titanium dioxide is also used as a matting agent for enamels, producing a very bright, hard and acid-resistant enamel glaze finish.

Titanium dioxide is generally divided into anatase type (Anatase, referred to as A type) and rutile type (Rutile, referred to as R type).

How to prepare titanium dioxide TiO2

Vapor Oxidation

Gas phase oxidation with dry oxygen at 923K-1023K:

TiCl4+O2=TiO2+2Cl2

Sulfuric acid method

First, use ground ilmenite and sulfuric acid (concentration ≥ 80%, temperature 343K-353K) to react under the condition of continuous introduction of air and stirring to obtain soluble sulfate:

FeTiO3+H2SO4=TiOSO4+FeSO4+2H2O

Since this reaction is exothermic, the temperature can reach 473K when the reaction is vigorous.

When preparing titanium dioxide, the key step is to hydrolyze the titanium liquid:

TiOSO4+2H2O=TiO2·H2O↓+H2SO4

The concentration, acidity and temperature of the titanium liquid will affect the progress of the hydrolysis reaction. The smaller the concentration, the smaller the acidity, and the higher the temperature, the easier the reaction will occur. In order to increase the temperature, the reaction is often carried out under pressure, which can also make the precipitated particles more compact and make the product have better physical properties.

Determination of titanium content in the preparation of titanium dioxide

When measuring, first add aluminum sheet to the titanium solution to reduce Ti(IV) to Ti3+. The reducing ability of Ti3+ is stronger than that of Sn2+, and it can reduce Fe3+. Therefore, KSCN is used as an indicator in the determination, and the content of Ti3+ is titrated with a standard Fe3+ solution. During titration, when Fe3+ ions are slightly excessive, blood-red [FeSCN]2+ will be formed, and the titration end point will be reached at this time. 

Overview of titanium dioxide TiO2 powder

Titanium dioxide TiO2 powder, also known as titanium dioxide, is an important inorganic chemical pigment whose main component is titanium dioxide. The production process of titanium dioxide has two process routes: sulfuric acid method and chloride method. Widely used in coatings, inks, paper, plastic rubber, chemical fiber, ceramics and other industries.

Among the commonly used white pigments, titanium dioxide has the smallest relative density. Among the white pigments of the same quality, titanium dioxide has the largest specific surface area and the largest pigment volume. Titanium dioxide has very stable chemical properties and is an acidic amphoteric oxide. At room temperature, it hardly reacts with other elements and compounds. Ineffective for oxygen, ammonia, nitrogen, hydrogen sulfide, carbon dioxide, sulfur dioxide. Insoluble in water, fat, dilute acid and inorganic acid, alkali, only soluble in hydrofluoric acid. . But under the action of light, titanium dioxide can undergo continuous redox reactions and has photochemical activity. This photochemical activity is particularly evident under the action of UV-anatase titanium dioxide.

Titanium dioxide has two structures: rutile (rutile R type) and anatase (A type). Rutile crystal structure is dense, relatively stable, and has low optical activity, so it has good weather resistance, high hiding power and extinction. Titanium dioxide has semiconducting properties, its conductivity increases rapidly with temperature, and it is also very sensitive to oxygen deficiency. The dielectric constant and semiconducting properties of rutile titanium dioxide are very important to the electronics industry and can be used to produce electronic components such as ceramic capacitors.

On a Mos hardness scale of 10 points, rutile TiO2 is 6-6.5 and anatase TiO2 is 5.5-6.0. Therefore, in chemical fiber matting, in order to avoid the wear of the spinneret hole, anatase is used. Although titanium dioxide is hydrophilic, its hygroscopicity is not too strong, and the rutile type is smaller than the anatase type. The hygroscopicity of titanium dioxide has a certain relationship with its surface area, the specific surface area is large, and the hygroscopicity is high, but it is also related to surface treatment and performance.

Application of titanium dioxide TiO2 powder

The most important applications of titanium dioxide are paints, varnishes and papers, as well as plastics, which account for around 80% of world titanium dioxide consumption. Other pigment applications, such as printing inks, fibers, rubber, cosmetics and food, account for another 8%. The remainder is used in other applications such as industrially pure titanium, glass and glass ceramics, electrical ceramics, metallic copper, catalysts, electrical conductors and chemical intermediates.

1. Titanium dioxide has become the most widely used white pigment due to its brightness and high refractive index.

2. Powdered titanium dioxide is also an effective sunscreen. It is used as a pigment to provide whiteness and opacity in products such as paints, coatings, plastics, paper, inks, food, pharmaceuticals (such as tablets and pills), and most toothpastes. In painting, it is often abbreviated to "lively white," "perfect white," "whitest white," or other similar terms.

3. Titanium dioxide is used as a colorant in the rubber industry, and also has the functions of reinforcement, anti-aging and filling.

4. Add titanium dioxide to white and colored rubber products, in the sun, it is resistant to sunlight, no cracking, no discoloration, high stretching ratio, and acid and alkali resistance.

5. Titanium dioxide for rubber is mainly used in automobile tires, rubber shoes, rubber floors, gloves, sports equipment, etc., generally anatase type.

6. In the production of automobile tires, a certain amount of rutile titanium dioxide products are often added to enhance the ability of anti-ozone and anti-ultraviolet rays.

7. Titanium dioxide is also widely used in cosmetics. Since titanium dioxide is non-toxic and far superior to lead white, almost all powdered titanium dioxide can replace lead and zinc white.

8. For permanent white, just add 5%-8% titanium dioxide powder to make the fragrance smoother, with strong adhesion, absorption and covering power.

9. Titanium dioxide in gouache and cold cream reduces greasiness and clarity.

10. Titanium dioxide is also used in many other fragrances, sunscreens, soaps, white soaps and toothpastes.

11. When deposited as a thin film, the refractive index and color of titanium dioxide make it an excellent reflective optical coating for dielectric mirrors.

12. Certain grades of modified titanium-based pigments are used in foam coatings, plastics, topcoats and cosmetics - the particles of these artificial pigments have two or more layers of different oxides (usually titanium dioxide, iron oxide or oxides) . aluminium), which can produce sparkling, iridescent and/or pearlescent effects.

13. Titanium dioxide is used as a pigment, sunscreen and thickener in cosmetics and skin care products, and in sunscreens and anti-ultraviolet pigments.

14. As a sunscreen, it uses ultra-fine TiO2, which is known for its combination with ultra-fine zinc oxide. It is considered an effective sunscreen that reduces the incidence of sunburn and minimizes the effects associated with long-term use. Early photoaging, photocarcinogenic and immunosuppressive sun exposure. extra semester. Sometimes these UV protectants are used in sunscreens with iron oxide pigments to enhance protection from visible light.

The price of titanium dioxide TiO2 powder

The price of titanium oxide TiO2 powder will vary randomly with the demand of production cost, transportation cost, international situation, exchange rate and market supply and demand. Tanki New Materials Co.,Ltd aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full range of customized services. If you are looking for titanium dioxide powder, please feel free to send us the latest titanium dioxide powder price.

Titanium oxide TiO2 powder suppliers

As a global supplier of titanium dioxide TiO2 powders, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced technology and engineered materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metals, etc.), high-purity targets, functional ceramics, structural devices, and provides OEM services.