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Preparation method of titanium dioxide with high weather resistance and high coverage

A technology of titanium dioxide and high weather resistance, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the disadvantages of forming dense silicon oxide film, incomplete coating, coating amount not less than 3.5%, etc. problem, to achieve the effect of saving dosage, good weather resistance and hiding power, and environmental friendliness

Inactive Publication Date: 2021-03-23
CHONGQING TITANIUM IND OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN101885926A provides a method of adding sodium silicate under high-temperature alkaline conditions, and then adjusting it to strong acidity (pH=0.8-1.5) with sulfuric acid. This method easily causes coated carbon dioxide in the process of adjusting the pH of the slurry. The silicon film dissolves again and nucleates itself, resulting in incomplete encapsulation
[0007] Chinese patent CN1850915A discloses a method of improving the weather resistance of titanium dioxide by using silicon-aluminum coating, but this invention requires that the coating amount of silicon oxide and aluminum oxide should not be lower than 3.5%, and the coating temperature should be lower than 85°C. Not conducive to the formation of dense silicon oxide film

Method used

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preparation example Construction

[0032] The preparation method of the titanium dioxide pigment with high weather resistance and good hiding power of the present invention comprises the following steps:

[0033] a. After pulverizing the primary product of titanium dioxide, add water to make a slurry, add sodium silicate as a dispersant, and add alkali to adjust the pH value of the slurry to 9.0-11.0;

[0034] b. Heating the slurry obtained in step a to 80°C-100°C, adding sodium silicate solution, and concurrently adding an acidic aluminum-containing compound solution to keep the pH value of the slurry at 8.0-10.0, and aging;

[0035] c. Cool down the aged slurry to 40°C-50°C, continue to add sodium silicate solution, and add acidic aluminum-containing compound solution to keep the pH value of the slurry at 8.0-10.0, and then mature;

[0036] d. Adjust the pH value of the slurry to 4.0-6.5 with an acidic aluminum-containing compound solution, and mature;

[0037] e. Adjust the pH value of the slurry to 7.0-8.0...

Embodiment 1

[0045] a. After pulverizing the primary product of titanium dioxide, add water to make a slurry with a concentration of 350g / L, add a dispersant for high-speed dispersion until the viscosity of the slurry is lower than 300cp, and then adjust the pH value of the slurry to 9.0;

[0046] b. Heat the slurry to 80°C, add sodium silicate solution, and use SiO in sodium silicate 2 Calculated as TiO in the slurry 22.0% of the mass, and at the same time, add aluminum sulfate solution concurrently to maintain the pH value of the slurry at 8.0-8.5, and mature for 30 minutes;

[0047] c. Cool down the cured slurry to 40°C, continue to add sodium silicate solution to remove SiO in sodium silicate 2 Calculated as TiO in the slurry 2 5.0% of the mass, add aluminum sulfate concurrently to keep the pH of the slurry at 8.0-8.5, and mature for 30 minutes;

[0048] d. Add aluminum sulfate to the slurry to react with the remaining sodium silicate. The amount of aluminum sulfate added is to adju...

Embodiment 2

[0052] a. After pulverizing the primary product of titanium dioxide, add water to make a slurry with a concentration of 350g / L, add a dispersant for high-speed dispersion until the viscosity of the slurry is lower than 300cp, and then adjust the pH value of the slurry to 9.5;

[0053] b. Heat the slurry to 85°C, add sodium silicate solution, and use SiO in sodium silicate 2 Calculated as TiO in the slurry 2 3.0% of the mass, and at the same time, add aluminum sulfate solution in parallel to maintain the pH value of the slurry at 8.5-9.0, and ripen for 45 minutes;

[0054] c. Cool down the cured slurry to 40°C, continue to add sodium silicate solution to remove SiO in sodium silicate 2 Calculated as TiO in the slurry 2 6.0% of the mass, add aluminum sulfate concurrently to keep the pH of the slurry at 8.5-9.0, and mature for 30 minutes;

[0055] d. Add aluminum sulfate to the slurry to react with the remaining sodium silicate. The amount of aluminum sulfate added is to adjus...

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Abstract

The invention belongs to the field of titanium dioxide production, and particularly relates to a preparation method of a titanium dioxide pigment with high weather resistance and high coverage. The preparation method comprises the following steps: a, crushing a titanium dioxide primary product to prepare slurry, adding sodium silicate, and adjusting the pH value to 9.0-11.0; b, heating the slurryto 80-100 DEG C, adding a sodium silicate solution, adding an acidic aluminum-containing compound solution in a parallel flow manner to keep the pH value of the slurry at 8.0-10.0, and conducting curing; c, cooling the cured slurry to 40-50 DEG C, adding a sodium silicate solution, adding an acidic aluminum-containing compound in a parallel flow manner to keep the pH value of the slurry at 8.0-10.0, and conducting curing; d, adjusting the pH value of the slurry to 4.0-6.5 by using an acidic aluminum-containing compound, and conducting curing; and e, adjusting the pH value of the slurry to 7.0-8.0 by using an alkaline aluminum-containing compound, conducting filtering, conducting washing with water, and conducting drying and crushing to obtain the product. The titanium dioxide obtained by the invention has good weather resistance and covering power.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to a preparation method of high weather resistance and high covering titanium dioxide pigment. Background technique [0002] Titanium dioxide (TiO 2 ) is a white pigment that is often used in many fields, such as coatings, plastics, paper, laminates or other coating systems. in TiO 2 In the process of surface treatment, the addition of certain chemicals under certain conditions can significantly increase the performance required of the pigment in the product application. Such as hiding power, dispersion and weather resistance. [0003] U.S. Patent US3510335 discloses an improved production method of titanium dioxide pigments: coating about 1-25% silicon dioxide film on the surface of titanium dioxide-alumina co-oxide pigments, and then calcining at 300-1000 ° C to obtain a A tarnish resistant and high opacity titanium dioxide. [0004] US Patent No. 4,075,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC09C1/3661C09C3/006C09C3/063
Inventor 袁秀香景建林柯良辉柳令李开娟
Owner CHONGQING TITANIUM IND OF PANGANG GROUP