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Preparation method of titanium dioxide pigment with high electrical resistivity

A technology of titanium dioxide and high resistivity, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of coating swelling, good conductivity, alkali, etc., to reduce adsorption and increase resistivity , the effect of reducing dosage

Active Publication Date: 2020-04-10
中信钛业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when titanium dioxide is applied in the downstream industry, if there is a high content of water-soluble salt in the production, it will cause the coating to swell, gel, and cause alkali; it will lead to uneven coating due to the good conductivity of the electrophoretic paint during the coating process. or porosity; will result in poor insulation of the insulating material
Therefore, during the use of titanium dioxide, there are strict requirements on its electrical conductivity, and the high conductivity of titanium dioxide that fails to meet the standard will affect the performance of downstream products

Method used

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  • Preparation method of titanium dioxide pigment with high electrical resistivity

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The rutile titanium dioxide semi-finished product prepared by the chlorination method was beaten with deionized water to obtain a titanium dioxide slurry with a mass concentration of 25%, stirred for 20 minutes, and a sodium hydroxide solution with a mass concentration of 25% was added to adjust the slurry to pH5.0. , stirring for 10min; adding propylene glycol methyl ether acetate as a wetting agent, its addition accounted for 2 0.1% by mass, stirred for 10 minutes, adjusted the slurry to pH 9.0, stirred for 10 minutes; added silicate, citric acid and ethylenediamine water-soluble salt solution as a dispersant, wherein sodium silicate, citric acid, ethyl The mass ratio of diamine to water is 15:15:10:65, and the amount added accounts for 2 0.3% by mass, stir for 20 minutes, continue to adjust the pH value of the slurry to 9.0 with a sodium hydroxide solution with a mass concentration of 25%, stir for 5 minutes, raise the temperature of the slurry to 70°C, add sodium me...

Embodiment 2

[0025] The rutile-type titanium dioxide semi-finished product prepared by the chlorination method was beaten with deionized water to obtain a titanium dioxide slurry with a mass concentration of 35%, stirred for 40 minutes, and a sodium hydroxide solution with a mass concentration of 35% was added to adjust the slurry to pH 5.5. Stir for 10min; add propylene glycol methyl ether acetate as wetting agent, its addition accounts for TiO 2 1% by mass, stir for 20 minutes, add 35% sodium hydroxide solution, adjust the slurry to pH 10.5, and stir for 20 minutes; add silicate, citric acid and ethylenediamine water-soluble salt solution as a dispersant, wherein , the mass ratio of sodium silicate, citric acid, ethylenediamine to water is 15:10:15:60, and the amount of dispersant added accounts for 2 0.6% by mass, stir for 40 minutes, continue to adjust the pH value of the slurry to 10.5 with a sodium hydroxide solution with a mass concentration of 35%, stir for 10 minutes, raise the te...

Embodiment 3

[0027] The rutile-type titanium dioxide semi-finished product prepared by the chlorination method was beaten with deionized water to obtain a titanium dioxide slurry with a mass concentration of 30%, stirred for 30 minutes, and a sodium hydroxide solution with a mass concentration of 30% was added to adjust the slurry to pH 5.3. Stir for 10min; add propylene glycol methyl ether acetate as wetting agent, its addition accounts for TiO 2 0.5% by mass, stirring for 15 minutes, adding 30% sodium hydroxide solution, adjusting the slurry to pH9.8, stirring for 15 minutes; adding silicate, citric acid and ethylenediamine water-soluble salt solution as a dispersant, wherein , the mass ratio of sodium silicate, citric acid, ethylenediamine to water is 15:12:12:61, and the amount of dispersant added accounts for 2 0.4% by mass, stir for 30 minutes, continue to adjust the pH value of the slurry to 10.0 with a sodium hydroxide solution with a mass concentration of 30%, stir for 8 minutes, ...

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Abstract

The invention relates to a preparation method of a titanium dioxide pigment with high electrical resistivity. The preparation method comprises the steps: preparing a rutile type titanium dioxide semi-finished product by adopting a chlorination method, pulping to prepare titanium dioxide slurry, adjusting the pH value to 5.0-5.5, adding a certain amount of a propylene glycol methyl ether acetate wetting agent, continuously adjusting the pH value to 9.0-11.0, adding silicate, citric acid and an ethylenediamine water-soluble salt solution, curing, and grinding; and carrying out inorganic film coating on the ground slurry, washing with water, drying, and carrying out steaming powder treatment to obtain the titanium dioxide pigment with high electrical resistivity. The method has the advantagesof simple process and easiness in operation. The wetting agent is added before dispersion treatment, the composite dispersing agent is adopted, and the white powder particles are covered with a negatively charged polymer, so that the adsorption effect of the titanium dioxide on the water-soluble salt is reduced, and the electrical resistivity of the titanium dioxide pigment is improved.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide pigment with high resistivity. Background technique [0002] Titanium dioxide is the best white pigment and also an important chemical raw material. Because of its excellent optical properties, stable chemical properties, high refractive index and good hiding power, it is widely used in the fields of electrophoretic paint, automotive intermediate coating, and iron printing coating. [0003] With the continuous expansion of the application field of titanium dioxide, the indicators and process requirements of titanium dioxide continue to increase, such as the level of resistivity, coating control, and environmental protection treatment. Among them, the level of resistivity of titanium dioxide directly affects the use of corresponding products in downstream industries Effects and related application performance. For example, when titanium dioxide is applied in the downstream industry, if t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC01P2006/19C01P2006/22C01P2006/40C01P2006/62C01P2006/63C01P2006/64C09C1/3661
Inventor 吴琼姜志刚穆宇同王建伟刘立新李冬旭任健
Owner 中信钛业股份有限公司
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