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Surface-modified titanium white powder and preparation method thereof

A technology of surface modification and titanium dioxide, which is applied in the direction of chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of low production capacity and product quality of titanium dioxide and large product gaps, and achieve low cost and high whiteness. The degree and method are simple and easy to implement

Inactive Publication Date: 2011-05-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although my country's titanium dioxide production capacity is large, the product quality is not high, and there is a big gap between the products of well-known foreign companies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The surface-modified titanium dioxide provided by the invention is prepared through the following steps:

[0017] A, adding titanium dioxide powder into water to make an aqueous solution with a mass concentration of 5%;

[0018] B. In the aqueous solution of step A, add sodium hexametaphosphate in an amount of 0.05% of the titanium dioxide powder mass, and adjust the pH of the solution to 9, and stir for 1 hour to obtain a mixed slurry;

[0019] C, in the mixed slurry of step B, add water-soluble sodium silicate to SiO 2 The content is 1% of the mass of titanium dioxide powder, adjust the pH of the solution to 8, so that SiO 2 Precipitate on the surface of titanium dioxide powder particles;

[0020] D. At a temperature of 80°C, add an aluminum sulfate coating agent with a concentration of 40g / L to the mixed slurry in step C until the Al in the mixed slurry 2 o 3 The content is 1% of the mass of titanium dioxide powder, stirred and reacted for 2 hours, until the alum...

Embodiment 2

[0023] The surface-modified titanium dioxide provided by the invention is prepared through the following steps:

[0024] A. Titanium dioxide powder is added to water to form an aqueous solution with a mass concentration of 20%;

[0025] B. In the aqueous solution of step A, add sodium hexametaphosphate in an amount of 0.2% of the titanium dioxide powder quality, and adjust the pH of the solution to 11, and stir for 3 hours to obtain a mixed slurry;

[0026] C, in the mixed slurry of step B, add water-soluble potassium silicate to SiO 2 The content is 10% of the mass of titanium dioxide powder, and the pH of the solution is adjusted to 11, so that SiO 2 Precipitate on the surface of titanium dioxide powder particles;

[0027] D. At a temperature of 100°C, add a sodium aluminate coating agent with a concentration of 100g / L to the mixed slurry in step C until the Al in the mixed slurry 2 o 3 The content is 5% of the mass of titanium dioxide powder, stirred and reacted for 5 h...

Embodiment 3

[0030] The surface-modified titanium dioxide provided by the invention is prepared through the following steps:

[0031] A, adding titanium dioxide powder into water to make an aqueous solution with a mass concentration of 10%;

[0032] B. In the aqueous solution of step A, add sodium hexametaphosphate in an amount of 0.1% of the titanium dioxide powder quality, and adjust the pH of the solution to 9, and stir for 2 hours to obtain a mixed slurry;

[0033] C, in the mixed slurry of step B, add water-soluble sodium silicate, potassium silicate, calcium silicate to SiO 2 The content is 5% of the mass of titanium dioxide powder, and the pH of the solution is adjusted to 9, so that SiO 2 Precipitate on the surface of titanium dioxide powder particles;

[0034] D. At a temperature of 90°C, add aluminum sulfate, sodium aluminate and sodium metaaluminate coating agent with a concentration of 50g / L to the mixed slurry in step C until the Al in the mixed slurry 2 o 3 The content is...

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PUM

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Abstract

The invention provides surface-modified titanium white powder and a preparation method thereof. The preparation method comprises the following steps of: preparing 5 to 20 mass percent aqueous solution from titanium dioxide powder, adding sodium hexametaphosphate into the aqueous solution, adding a water-soluble silicon compound to ensure that SiO2 is precipitated on the surfaces of titanium dioxide particles, adding an aluminum salt membrane-enveloping agent at the temperature of between 80 and 100 DEG C and keeping the pH of mixed slurry to be between 8.5 and 11 simultaneously to ensure that the titanium white powder is uniformly dispersed, washing, performing suction filtration, drying and grinding to obtain a surface-modified titanium white powder product. A layer of inorganic substances can be enveloped on the surfaces of the titanium white powder particles, namely silicon ions and aluminum ions are adhered on the surface of the titanium white powder simultaneously, so that the surface activity of the titanium white powder is reduced, and the dispersibility and whiteness of the titanium white powder are improved. The method is easy, feasible, low in cost and pollution-free.

Description

technical field [0001] The invention relates to a surface-modified titanium dioxide and a preparation method thereof. Specifically, a layer of inorganic matter is coated on the surface of the titanium dioxide to improve the dispersibility, weather resistance and whiteness of the titanium dioxide, which belongs to the powder material processing technology field. Background technique [0002] Titanium dioxide is widely used in pigments such as coatings, rubber, plastics, paper and other industries due to its stable chemical properties and good whiteness, tinting strength, hiding power and heat resistance. It is also used as a photocatalyst, photoelectric cell, etc. , UV shielding agent, etc. are widely used. The surface of titanium dioxide without surface treatment is generally covered by polar groups (such as -OH), so titanium dioxide is easy to agglomerate due to polar adsorption or moisture absorption, and it is difficult to disperse in other systems. Therefore, it is ver...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06
Inventor 严继康甘国友王韫杜景红易健宏
Owner KUNMING UNIV OF SCI & TECH
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