Method for improving compactness of silicon dioxide coating layer on surface of titanium dioxide

A technology of silica and titanium dioxide, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of limited improvement of coating uniformity and compactness, etc.

Active Publication Date: 2020-09-04
中信钛业股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, commonly used predispersants such as sodium hexametaphosphate and sodium silicate only

Method used

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  • Method for improving compactness of silicon dioxide coating layer on surface of titanium dioxide
  • Method for improving compactness of silicon dioxide coating layer on surface of titanium dioxide
  • Method for improving compactness of silicon dioxide coating layer on surface of titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Get 200g of titanium dioxide and disperse it in water, configure the initial slurry of titanium dioxide with a mass concentration of 40%;

[0027] (2) Set the reaction temperature to 90°C, and keep the temperature constant during the titanium dioxide coating process;

[0028] (3) Under the action of stirring, trisodium citrate accounting for 0.05% of the mass of titanium dioxide and NaCl solid accounting for 8% of the mass of titanium dioxide are added to the titanium dioxide slurry;

[0029] (4) adjust slurry pH value to be 11 with NaOH solution;

[0030] (5) Use a peristaltic pump to drop sodium silicate and flow-coat dense SiO 2 coating layer, the addition of the sodium silicate is SiO 2 accounted for 4.0% of the mass of titanium dioxide, while maintaining a pH value of 11 with NaOH solution, and aging for 2 hours;

[0031] (6) Wash the mature slurry obtained in step (5), then dry and steam powder treatment to obtain dense SiO 2 coated with titanium dioxide. ...

Embodiment 2

[0033] (1) Get 200g of titanium dioxide and disperse it in water, configure the initial slurry of titanium dioxide with a mass concentration of 40%;

[0034] (2) Set the reaction temperature to 90°C, and keep the temperature constant during the titanium dioxide coating process;

[0035] (3) Add 0.1% trisodium citrate by mass of titanium dioxide and 8% NaCl solids by mass of titanium dioxide into the titanium dioxide slurry under stirring;

[0036] (4) adjust slurry pH value to be 11 with NaOH solution;

[0037] (5) Use a peristaltic pump to drop sodium silicate and flow-coat dense SiO 2 coating layer, the addition of the sodium silicate is SiO 2 accounted for 4.0% of the mass of titanium dioxide, while maintaining a pH value of 11 with NaOH solution, and aging for 2 hours;

[0038] (6) Wash the mature slurry obtained in step (5), then dry and steam powder treatment to obtain dense SiO 2 coated with titanium dioxide.

Embodiment 3

[0040] (1) Get 200g of titanium dioxide and disperse it in water, configure the initial slurry of titanium dioxide with a mass concentration of 40%;

[0041] (2) Set the reaction temperature to 90°C, and keep the temperature constant during the titanium dioxide coating process;

[0042] (3) Add 0.15% trisodium citrate by mass of titanium dioxide and 8% NaCl solids by mass of titanium dioxide into the titanium dioxide slurry under stirring;

[0043] (4) adjust slurry pH value to be 11 with NaOH solution;

[0044] (5) Use a peristaltic pump to drop sodium silicate and flow-coat dense SiO 2 coating layer, the addition of the sodium silicate is SiO 2 accounted for 4.0% of the mass of titanium dioxide, while maintaining a pH value of 11 with NaOH solution, and aging for 2 hours;

[0045] (6) Wash the mature slurry obtained in step (5), then dry and steam powder treatment to obtain dense SiO 2 coated with titanium dioxide.

[0046] The coated product obtained after pre-dispersi...

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Abstract

A method for improving compactness of a silicon dioxide coating layer on the surface of titanium dioxide comprises the following steps: (1) preparing titanium dioxide into titanium dioxide slurry; (2)adjusting the reaction temperature to ensure that the temperature is constant in the titanium dioxide coating process; (3) adding a pre-dispersing agent and NaCl solid into the titanium dioxide slurry under the action of stirring, the pre-dispersing agent being trisodium citrate; (4) adjusting the pH value of the titanium dioxide initial slurry; (5) applying a compact SiO2 coating layer with sodium silicate in a parallel flow manner by adopting a peristaltic pump, and curing to obtain coated product slurry; and (6) washing and drying the coating slurry product, and carrying out steam powder treatment to obtain compact SiO2 coated titanium dioxide. The process is simple and the raw material cost is low. The dispersity of the titanium dioxide slurry can be improved, and the formation of a silicon dioxide coating layer is favorably induced, so that a titanium dioxide coating product with a more uniform and compact coating layer is prepared.

Description

technical field [0001] The invention relates to a method for improving the compactness of a silicon dioxide coating layer on the surface of titanium dioxide, which belongs to the field of titanium dioxide production. Background technique [0002] Titanium dioxide has good hiding rate, opacity and stable physical and chemical properties. It is a kind of white pigment with excellent performance. However, due to the certain photocatalytic activity of titanium dioxide, Ti(Ⅳ) in titanium dioxide will ) is easily reduced to Ti(Ⅲ), releasing nascent oxygen, and nascent oxygen has a high reactivity, so that the high molecular organic matter in the titanium dioxide coating is oxidized to small molecular organic matter, destroying the coating. continuity. Therefore, the weather resistance of untreated titanium dioxide is relatively low, and it is prone to loss of light, yellowing, and chalking during use, which limits its application. [0003] In order to improve the weather resista...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06
CPCC09C1/3661C01P2006/22C01P2004/84
Inventor 于学成郑水林吴琼孙志明姜志刚张祥伟王建伟董雄波刘立新张炳
Owner 中信钛业股份有限公司
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