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] C

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

Example Embodiment

[0055] Example 1

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

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

[0058] c. The temperature of the slurry is reduced to 50°C, sodium hydrogen phosphate is added, and aluminum sulfate is added in parallel to generate aluminum phosphate, and the addition speed of sodium hydrogen phosphate and aluminum sulfate is controlled to make the slurry pH 5.0-9.0; among them, phosphoric acid The amount of sodium hydrogen added is P in sodium hydrogen phosphate 2 O 5 Counted as T...

Example Embodiment

[0062] Example 2

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

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

[0065] c. The temperature of the slurry is reduced to 60°C, phosphoric acid is added, and sodium metaaluminate is added in parallel to generate aluminum phosphate, and the addition speed of phosphoric acid and sodium metaaluminate is controlled to make the slurry pH 5.0-9.0; among them, phosphoric acid Adding amount is P in phosphoric acid 2 O 5 Counted as TiO in the slurry 2 1.0% of mass, curing for 60min;

[0066] d. Add sodium m...

Example Embodiment

[0069] Example 3

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

[0071] b. Heat the slurry to 90°C, add sodium silicate, the added amount of sodium silicate is SiO in the sodium silicate 2 Counted as TiO in the slurry 2 3.5% of the mass, and acid is added in parallel to control the pH of the slurry from 9.5 to 10.0, and mature for 30 minutes;

[0072] c. The temperature of the slurry is reduced to 70°C, sodium hexametaphosphate is added, and sodium metaaluminate is added in parallel to generate aluminum phosphate, and the addition speed of sodium hexametaphosphate and sodium metaaluminate is controlled to make the slurry pH 5.0 ~9.0; Among them, the amount of sodium hexametaphosphate added is the P of sodium hexametaphosphate 2 O 5 Counted as TiO in the slurry...

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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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