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Preparation method of titanium dioxide pigment

A technology of titanium dioxide and silicon dioxide, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of reducing weather resistance, limited light resistance, and the presence of large phosphoric acid, etc., to achieve light resistance and weather resistance Improve and enhance the dispersion performance, the effect of adding less phosphoric acid

Inactive Publication Date: 2014-12-10
PANGANG GROUP TITANIUM INDAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, zirconium is a relatively expensive raw material, which will increase the production cost in actual production, and the effect of improving light resistance is limited
[0008] 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
[0009] Chinese patent CN103709792A uses downstream coating of sodium silicate and parallel aluminum phosphate for coating, and the coating amount is relatively large, but the downstream coating of silicon dioxide in this method is not dense enough, resulting in poor weather resistance of the product, and phosphoric acid A large amount will cause the aluminum phosphate to form a film on its own and reduce the weather resistance
And excessive phosphoric acid will easily lead to a large amount of free phosphoric acid in the filtrate, causing environmental pollution

Method used

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  • Preparation method of titanium dioxide pigment
  • Preparation method of titanium dioxide pigment
  • Preparation method of titanium dioxide pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] a. Take 250g of the primary product of titanium dioxide, pulverize it with deionized water to form a slurry with a concentration of 250g / L, add monoisopropanolamine to disperse until the viscosity of the slurry is 220cp, and adjust the pH value of the slurry with sodium hydroxide solution to 9.0;

[0057] b. Heat the slurry to 85°C, add sodium silicate, the amount of sodium silicate added is SiO in sodium silicate 2 Calculated, is the TiO in the slurry 2 1.5% of the mass, and add acid to control the pH value of the slurry to be 9.5-10.0, and ripen for 30 minutes;

[0058] c. The temperature of the slurry is lowered to 50°C, adding sodium hydrogen phosphate, and adding aluminum sulfate in parallel to form aluminum phosphate, and controlling the adding speed of sodium hydrogen phosphate and aluminum sulfate so that the pH value of the slurry is 5.0-9.0; among them, phosphoric acid Addition amount of sodium hydrogen phosphate is P in sodium hydrogen phosphate 2 o 5 Cal...

Embodiment 2

[0063] a. Take 300g of the primary product of titanium dioxide, pulverize it and make a slurry with a concentration of 270g / L with deionized water, add monoisopropanolamine to disperse until the viscosity of the slurry is 150cp, and add alkali to adjust the pH value of the slurry to 10.0 ;

[0064] b. Heat the slurry to 87°C, add sodium silicate, the amount of sodium silicate added is SiO in sodium silicate 2 Calculated, is the TiO in the slurry 2 2.5% of the mass, and add acid to control the pH value of the slurry to be 9.5-10.0, and ripen for 60 minutes;

[0065] c. The temperature of the slurry is lowered to 60°C, add phosphoric acid, and add sodium metaaluminate in parallel to form aluminum phosphate, and control the adding speed of phosphoric acid and sodium metaaluminate to make the pH value of the slurry 5.0-9.0; among them, phosphoric acid The amount added is P in phosphoric acid 2 o 5 Calculated as TiO in the slurry 2 1.0% by mass, matured for 60 minutes;

[006...

Embodiment 3

[0070] a. Get 350g of titanium dioxide primary product, pulverize it and make a slurry with a concentration of 280g / L with deionized water, add sodium hexametaphosphate to disperse until the viscosity of the slurry is 240cp, and add alkali to adjust the pH value of the slurry to 11.0;

[0071] b. Heat the slurry to 90°C, add sodium silicate, the amount of sodium silicate added is based on SiO in sodium silicate 2 Calculated as TiO in the slurry 2 3.5% of the mass, and add acid to control the pH value of the slurry to be 9.5-10.0, and ripen for 30 minutes;

[0072] c. The temperature of the slurry is lowered to 70°C, add sodium hexametaphosphate, and add sodium metaaluminate in parallel to form aluminum phosphate, and control the adding speed of sodium hexametaphosphate and sodium metaaluminate to make the pH value of the slurry 5.0 ~9.0; Among them, the amount of sodium hexametaphosphate added is based on the P of sodium hexametaphosphate 2 o 5 Calculated as TiO in the slur...

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Abstract

The invention belongs to the field of titanium dioxide production, particularly relates to a preparation method of a titanium dioxide pigment, and aims at solving the technical problem of providing a preparation method of a titanium dioxide pigment which is high in weather fastness and relatively friendly to environment. In order to solve the technical problem, according to the technical scheme, the preparation method comprises the following steps: firstly, carrying out silica coating on a silica primary product; then carrying out aluminum phosphate coating; and finally, carrying out alkaline coating on aluminum oxide to form a boehmite type aluminum oxide coating. According to the invention, coating is carried out by adopting the method, so that the light resistance and the weather fastness of the product are improved, and meanwhile, the dispersing performance of the product is also improved. According to the method, the addition of the phosphoric acid is relatively low, the generated free phosphoric acid is little, so resource waste is avoided, and the method is relatively friendly to environment.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to a preparation method of 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 in hiding power, dispersion and light stability. [0003] The weather resistance of titanium dioxide without surface treatment is poor. If some chemicals are added under specific conditions during the surface treatment process, the weather resistance of the pigment will be significantly enhanced. The most common ones are cerium, zirconium, silicon, phosphorus, For some compounds of aluminum, titanium dioxide manufacturers a...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09C3/08
Inventor 袁秀香郑少华廖荣华景建林周俊袁立军吴平全
Owner PANGANG GROUP TITANIUM INDAL
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