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Titanium dioxide with high weather resistance and preparation method thereof

A technology of titanium dioxide and weather resistance, applied in the field of titanium dioxide, can solve the problems of non-dense titanium dioxide film and poor weather resistance, and achieve the effect of reducing photocatalytic activity and improving weather resistance and dispersibility.

Inactive Publication Date: 2017-07-14
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the titanium dioxide film prepared by the prior art is not dense, and the weather resistance is not good, etc.

Method used

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Examples

Experimental program
Comparison scheme
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preparation example Construction

[0026] The invention provides a preparation method of high weather resistance titanium dioxide, comprising the following steps:

[0027] a. The first layer of aluminum oxide coating

[0028] Add a dispersant to the titanium dioxide slurry, heat to 50-90°C, add acid to adjust the pH value to 4.0-6.0 or add alkali to adjust the pH value to 8.0-10.0, add aluminum raw materials, and keep the pH value at 4.0-6.0 or 8.0- 10.0, aging for 0.5-2 hours to obtain a titanium dioxide slurry coated with alumina;

[0029] b. The second layer of silica coating

[0030] Add acid to the alumina-coated titania slurry obtained in step a to adjust the pH to 0.1-3.0, then add sodium silicate and acid to adjust the pH to 0.1-3.0, adjust the temperature to 50-100°C, and mature for 0.5 ~3h;

[0031] c. The third layer of aluminum oxide coating

[0032] Adjust the temperature of the titanium dioxide slurry aged in step b to 50-90°C, add aluminum raw materials, adjust the pH value to 2.0-10.0, and a...

Embodiment 1

[0046] Example 1 Preparation of high weather resistance titanium dioxide by the technical method of the present invention

[0047]Take 1000mL of sulfuric acid method titanium dioxide slurry before coating, the concentration is 300g / L, add sodium hexametaphosphate as a dispersant of 0.2% by weight of titanium dioxide, adjust the pH value to 4.0 with sulfuric acid, heat to 50°C, and add 100g at the same time while stirring / L sodium metaaluminate and 10% sulfuric acid, maintain the pH between 3.8-4.2, add sodium metaaluminate as 0.5% of the weight of untreated titanium dioxide, add 30 minutes, and mature for 30 minutes. Raise the temperature to 90°C, adjust the pH value to 2.0 with sulfuric acid, and add 100g / L sodium silicate solution (as SiO 2 ) and 10% dilute sulfuric acid to keep the pH value of the slurry between 1.8 and 2.2, the total amount of sodium silicate solution added dropwise is 3% of the weight of untreated titanium dioxide, and the dropwise addition is completed ...

Embodiment 2

[0049] Example 2 Preparation of high weather resistance titanium dioxide by the technical method of the present invention

[0050] Take 1000mL of chlorinated titanium dioxide before coating slurry, the concentration is 500g / L, add the dispersant monoisopropanolamine accounting for 0.3% of the weight of titanium dioxide, adjust the pH value to 7.0 with hydrochloric acid, heat to 70°C, and stir at the same time Add 100g / L sodium metaaluminate and 10% sulfuric acid to maintain the pH between 6.8-7.2. The amount of sodium metaaluminate added is 1.0% of the weight of the untreated titanium dioxide. The addition is completed in 30 minutes and matured for 30 minutes. Raise the temperature to 90°C, adjust the pH value to 0.8 with hydrochloric acid, add sodium silicate (calculated as SiO 2 meter), control the pH value of the slurry to be less than 3.0, and ripen for 120 minutes after the dropwise addition.

[0051] Add 100g / L sodium metaaluminate in 30min, add the amount of sodium met...

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Abstract

The invention belongs to the technical field of titanium dioxide and in particular relates to titanium dioxide with high weather resistance and a preparation method thereof. In order to solve the problems that a titanium dioxide film prepared in the prior art is not compact, poor in weather resistance and the like, the invention provides the titanium dioxide with high weather resistance. The method comprises the following steps: a, adding a dispersing agent into titanium dioxide slurry, then adding an aluminum raw material and curing the mixture to obtain titanium dioxide slurry coating aluminum oxide; b, adding an acid into the titanium dioxide slurry obtained in the step a to adjust the pH to 0.1-3.0 and then adding sodium silicate and an acid to cure; and c, adding the titanium dioxide slurry obtained in the step b into the aluminum raw material, and curing, filtering, washing, drying and micro-crushing and organically treating the mixture to obtain the titanium dioxide with high weather resistance. The titanium dioxide with three coating films prepared by the method is good in film compactness and high in weather resistance, and the preparation method is simple to operate and convenient to popularize and implement.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide, and in particular relates to a highly weather-resistant titanium dioxide and a preparation method thereof. Background technique [0002] Due to its semiconductor properties, titanium dioxide has strong photocatalytic activity, and can degrade organic matter in contact with it under sunlight, especially ultraviolet radiation, causing yellowing and pulverization of coatings. In order to improve the weather resistance of titanium dioxide pigments, titanium dioxide is usually coated with an inorganic surface to isolate titanium dioxide from the surrounding organic matter to improve its weather resistance. [0003] Commonly used coating materials are silica, alumina, zirconia, etc. Among them, titanium dioxide coated with dense silicon oxide has the best weather resistance. However, the current common practice is to deposit silicon oxide first, and then deposit aluminum oxide, and the dense...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06C09C3/08C09C3/10
CPCC09C1/3661C09C1/3692C09C3/006C09C3/063
Inventor 刘勇吕波王海波吴小平
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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