Method for preparing high water dispersibility titanium dioxide

A dispersive and titanium dioxide technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as poor effect, complicated steps, and no rutile titanium dioxide, so as to improve Effect of water dispersibility and high water dispersibility

Active Publication Date: 2014-08-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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Problems solved by technology

[0003] In the prior art, the method for improving the water dispersibility of titanium dioxide usually adopts organic coating or inorganic-organic coating treatment, for example, by coating silicon, aluminum or by adding a hydrophilic treatment agent such as TMP to titanium Organic processing of white products, but its steps are relatively complicated and the effect is not very good
[0004] According to the current relevant literature and patent reports, there is no method for obtaining highly water-dispersible rutile titanium dioxide by coating aluminum phosphate and alumina on the inorganic surface.

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  • Method for preparing high water dispersibility titanium dioxide

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[0019] The method for preparing highly water-dispersible titanium dioxide of the present invention is mainly used for surface treatment of rutile titanium dioxide to improve its water dispersibility. The specific idea of ​​the present invention is to first add a dispersant to improve the dispersion of the titanium dioxide slurry, Phosphorus-containing solution and aluminum-containing solution are used as the coating agent, and then the coating agent is deposited on the surface of titanium dioxide in the form of aluminum phosphate and hydrated alumina, thereby effectively improving the water dispersibility of the product and obtaining titanium with high water dispersibility white powder products. Wherein, the contents described herein are all mass percentage contents, and the means for characterizing the water dispersibility of titanium dioxide in the present invention refer specifically to the water dispersibility detection method in the example, but the present invention is no...

example 1

[0050] Take 1000g of the primary product of rutile titanium dioxide that has not been post-treated, beat it with desalted water, the concentration of the titanium dioxide slurry obtained after beating is 280g / l, heat the titanium dioxide slurry to 50°C; then make the mass concentration 18% The sodium silicate solution is added into the above-mentioned heated titanium dioxide slurry, and stirred evenly, wherein, the addition amount of the sodium silicate solution is the TiO2 in the titanium dioxide slurry 2 0.08% of the mass; then add sodium hexametaphosphate solution, the amount of sodium hexametaphosphate solution is P 2 o 5 Calculate and follow the mass ratio for P 2 o 5 : TiO 2 =2.5:100 calculation, slaking 15min; Add aluminum sulfate solution again, wherein, the add-on of aluminum sulfate solution is with Al 2 o 3 Calculate and follow Al 2 o 3 TiO in titanium dioxide slurry 2 Calculated at 2.5% of the mass, the pH value of the titanium dioxide slurry is controlled ...

example 2

[0052] Take 1000g of the primary product of rutile titanium dioxide that has not been post-treated, and beat it with desalted water. The concentration of the titanium dioxide slurry obtained after beating is 300g / l, and the titanium dioxide slurry is heated to 60°C; then the mass concentration is 18%. The ammonium dihydrogen phosphate solution is added to the above-mentioned heated titanium dioxide slurry, and stirred evenly, wherein, the amount of ammonium dihydrogen phosphate added is the TiO2 in the titanium dioxide slurry 2 0.25% of the mass; then add phosphoric acid solution, the amount of phosphoric acid solution is P 2 o 5 Calculate and follow the mass ratio for P 2 o 5 : TiO 2 =2.0:100 calculation, aging 60min; then add aluminum sulfate solution, wherein, the addition of aluminum sulfate solution is based on Al 2 o 3 Calculate and follow Al 2 o 3 TiO in titanium dioxide slurry 2 Calculated at 1.0% of the mass, the pH value of the titanium dioxide slurry is cont...

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Abstract

The invention discloses a method for preparing a high water dispersibility titanium dioxide. The method comprises the following steps sequentially: a, adding a dispersing agent into a titanium dioxide slurry, and stirring uniformly; b, adding a phosphorus-containing solution, and curing; c, adding an aluminum sulfate solution to control the pH value of the titanium dioxide slurry to be 1.5 to 4.5, and curing; d, adding a sodium metaaluminate solution to control the pH value of the titanium dioxide slurry to be 8.5 to 10.5, and curing; e, adjusting the pH value of the titanium dioxide slurry to be 7.0 to 7.8, and curing; f, filtering, washing, drying, and pulverizing to obtain the high water dispersibility titanium dioxide. According to the method, before coating, the dispersing agent is added to improve a dispersing condition of the titanium dioxide slurry, then the phosphorus-containing solution and the aluminum-containing solution are used as a coating agent, and then the coating agent is deposited on the surface of titanium dioxide in forms of aluminum phosphate and hydrated alumina, so that the water dispersibility of a product is effectively improved, and the titanium dioxide product with the high water dispersibility is obtained.

Description

technical field [0001] The invention relates to the technical field of chemical industry, and more specifically relates to a method for preparing high water-dispersible titanium dioxide through surface treatment. Background technique [0002] As a white pigment, titanium dioxide is widely used in the fields of coatings, plastics, inks and papermaking. According to the hydrophilicity and lipophilicity of titanium dioxide system, it can be divided into water-based system and oil-based system. In the application of water-based system titanium dioxide, water dispersibility plays a key role in its application performance, especially in water-based coatings and papermaking. In the field, if the water dispersibility of titanium dioxide is good, it will have high hiding power and good whiteness, and it will help to keep the paint system stable for a long time, which is convenient for transportation and storage and increase the mechanical properties of the coating film; if the water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
Inventor 李礼徐玉婷杜剑桥吴健春王斌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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