Method for coating surface of titanium dioxide with compact alumina

A surface coating, titanium dioxide technology, applied in the field of analysis and detection, can solve the problem of no obvious improvement and improvement in application performance, and achieve the effect of uniform and dense coating

Inactive Publication Date: 2020-05-05
CHONGQING TITANIUM IND OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The coating of zinc oxide can also improve the weather resistance of titanium dioxide to a c...

Method used

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  • Method for coating surface of titanium dioxide with compact alumina
  • Method for coating surface of titanium dioxide with compact alumina
  • Method for coating surface of titanium dioxide with compact alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A. Put rutile titanium dioxide particles into a stirring device, add deionized water or distilled water, add sodium silicate (SiO 2 : TiO 2 =0.3wt%) and sodium hydroxide as a dispersant, zirconium beads as a grinding medium, control the pH of the slurry in the beating process=9.0~10.0, beating and dispersing for 60min, and filtering with a 325 mesh screen to obtain a concentration of 620g / L. Membrane front slurry;

[0050] B. Take the slurry before coating and put it in the coating tank, add deionized water or distilled water, dilute the slurry concentration to 280g / L, turn on the heating device, and control the temperature of the slurry at about 60°C;

[0051] C. Add a dilute sulfuric acid solution with a mass concentration of 15% to the slurry, adjust the pH of the slurry to 8.5-10.0, and maintain the temperature of the slurry at about 60°C;

[0052] D. Add dilute sulfuric acid and sodium metaaluminate (calculated as alumina, the addition amount is 3.0% of the mass ...

Embodiment 2

[0056] A. Put rutile titanium dioxide particles into a stirring device, add deionized water or distilled water, add sodium silicate (SiO 2 : TiO 2 =0.3wt%) and sodium hydroxide as a dispersant, zirconium beads as a grinding medium, control the pH of the slurry in the beating process=9.0~10.0, beating and dispersing for 60min, and filter with a 325 mesh screen to obtain 620g / L pre-encapsulated pulp;

[0057] B. Take the slurry before coating and put it in the coating tank, add deionized water or distilled water, dilute the slurry concentration to 280g / L, turn on the heating device, and control the temperature of the slurry at about 60°C;

[0058] C. Add dilute hydrochloric acid solution with a mass concentration of 15% to the slurry, adjust the pH of the slurry to 8.5-10.0, and maintain the temperature of the slurry at about 60°C;

[0059] D. Add dilute hydrochloric acid and sodium metaaluminate (calculated as alumina, the amount added is 3.0% of the mass of titanium dioxide)...

Embodiment 3

[0063] A. Put rutile titanium dioxide particles into a stirring device, add deionized water or distilled water, add sodium silicate (SiO 2 : TiO 2 =0.3wt%) and sodium hydroxide as a dispersant, zirconium beads as a grinding medium, control the pH of the slurry in the beating process=9.0~10.0, beating and dispersing for 60min, and filter with a 325 mesh screen to obtain 620g / L pre-encapsulated pulp;

[0064] B. Take the slurry before coating and put it in the coating tank, add deionized water or distilled water, dilute the slurry concentration to 280g / L, turn on the heating device, and control the temperature of the slurry at about 60°C;

[0065] C. Add an appropriate amount of dilute phosphoric acid solution to the slurry, the mass concentration of dilute phosphoric acid is 15%, adjust the pH of the slurry to 8.5-10.0, and maintain the temperature of the slurry at about 60°C;

[0066] D. Add dilute phosphoric acid and sodium metaaluminate (calculated as alumina, the addition...

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Abstract

The invention discloses a method for coating the surface of titanium dioxide with compact alumina, and belongs to the technical field of analysis and detection. In order to improve pulverization resistance, weather resistance and glossiness of titanium dioxide and reduce the oil absorption amount of the product, the invention provides a method for coating the surface of titanium dioxide with compact alumina. The method comprises the following steps: mixing titanium dioxide, water and a dispersing agent; pulping and dispersing to obtain pre-coating slurry, diluting the pre-coating slurry with water, adjusting the pH value and temperature of the slurry, adding sodium metaaluminate and dilute acid, controlling the pH value to carry out primary curing and secondary curing, screening, filtering, washing, and carrying out organic treatment, drying and crushing to obtain uniform and compact alumina-coated titanium dioxide. By analyzing conventional indexes, TEM, BET and the like of the product, uniform and compact coating of the alumina film is determined.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a method for coating the surface of titanium dioxide with dense alumina. Background technique [0002] As a white pigment, titanium dioxide has a wide range of uses, involving almost all industrial fields and our daily life. It is known as "industrial monosodium glutamate". my country's titanium dioxide production is already at the top level in the world, and is still in a period of rapid growth. At present, domestic titanium dioxide production is still dominated by sulfuric acid process titanium dioxide. There is still a large gap between the quality of domestic titanium dioxide and foreign countries, especially the first-class Japanese Ishihara products in some European countries, especially the difference in some application properties of titanium dioxide for pigments. [0003] Compared with foreign high-end titanium dioxide, the dispersibility of d...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09C3/12
CPCC09C1/3661C09C1/3684C09C1/3692C09C3/006C09C3/063C09C3/12
Inventor 冯燕淦文军李开娟刘琦罗静
Owner CHONGQING TITANIUM IND OF PANGANG GROUP
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