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Titanium dioxide silicon-aluminum coating method

A technology of titanium dioxide and silica-alumina, which is applied in the direction of chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of insufficient brightness of titanium dioxide, difficulty in washing, and large amount of washing water, etc., and achieve a dense coating film and reduce The effect of washing water volume and production cost is low

Inactive Publication Date: 2018-02-23
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

[0003] Aiming at the above-mentioned problems of insufficient brightness, difficulty in washing, and large amount of washing water by using silicon oxide-coated titanium dioxide, the present invention provides a silicon-aluminum coating method for titanium dioxide

Method used

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  • Titanium dioxide silicon-aluminum coating method

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Embodiment 1

[0033] Embodiment 1 uses the inventive method to carry out coating to titanium dioxide

[0034] Take 300g of the primary product of titanium dioxide and add it to 1000ml of deionized water (300g / L), stir at a high speed for beating, heat to 90°C, adjust the pH to 10 with sodium hydroxide, and add 100g / L dropwise with two peristaltic pumps under stirring conditions Orthosilicic acid solution (as SiO 2 ) and 10% sodium hydroxide to keep the pH value of the slurry between 7.5 and 8.0, the total amount of silicon added dropwise is 3% of the weight of untreated titanium dioxide, and the dropwise addition is completed within 90 minutes. After the dropwise addition, mature for 120 minutes . Add the sodium metaaluminate of 100g / L and the sulfuric acid of 10% concurrently, the amount that adds sodium metaaluminate is 2% (as Al 2 o 3 During this process, the pH was maintained at 6.0-8.0, and the addition was completed within 90 minutes, matured for 60 minutes, adjusted to pH 7.0, and...

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Abstract

The invention belongs to the technical field of titanium dioxide production and specifically relates to a titanium dioxide silicon-aluminum coating method. Aiming at the problems that utilizing silicon oxide to coat titanium dioxide has insufficient brightness, difficulty in washing and a large water washing amount, the invention provides the titanium dioxide silicon-aluminum coating method. The titanium dioxide silicon-aluminum coating method comprises the following steps: a, preparing the titanium dioxide into slurry, adding orthosilicic acid and sodium hydroxide, controlling a pH of the slurry as 6.5 to 8.0, stirring, depositing a layer of silicon dioxide on the surfaces of titanium dioxide particles and stirring and curing for 0.5h to 2h; b, adjusting temperature of the slurry as 60 to90 DEG C and a pH value of the slurry as 5.0 to 10.5, adding sodium metaaluminate and inorganic acid, maintaining the pH value as 5.0 to 10.5, stirring and curing for 0.5h to 1h, coating a layer of aluminum oxide film to obtain silicon-aluminum coated titanium dioxide. The coated titanium dioxide prepared by the method disclosed by the invention has the advantages of higher brightness, more easiness in washing and low production cost.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, and in particular relates to a silicon-aluminum coating method of titanium dioxide. Background technique [0002] TiO 2 There are photoactive defects on the surface. Under the irradiation of ultraviolet rays, oxygen ions will lose two electrons and become atomic oxygen (or new ecological oxygen). The released new ecological atomic oxygen has high activity and can oxidize and TiO 2 All organic matter in contact with. In order to improve the surface properties of titanium dioxide, proper surface treatment is very necessary. At present, the general method is to carry out inorganic coating treatment on the surface of titanium dioxide, that is, to coat a layer of inorganic hydrated oxide on the titanium dioxide powder particles. The coating materials mainly include silica, alumina, zirconia, etc. Make titanium dioxide and organic medium not have direct contact, to achieve the ro...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06
Inventor 侯腾飞刘勇吕波吴小平
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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