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Method for coating hydrous zirconium oxide on surface of rutile type titanium dioxide

A titanium dioxide and rutile type technology, applied in the direction of titanium oxide/hydroxide, titanium dioxide, etc., can solve the problems of paint film yellowing, pulverization, harsh conditions, etc., and achieve simple process, less amount of zirconia, and good coating performance effect

Inactive Publication Date: 2010-06-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong photocatalytic effect of titanium dioxide particles, it can degrade the film-forming agent of its base material under the irradiation of sunlight, especially ultraviolet rays, resulting in yellowing and pulverization of the paint film, which seriously affects the performance of titanium dioxide pigments.
Existing U.S. Patent (B.P.Howard, D.O'Donnell, U.S.Patent 4,447,270,1984) discloses a three-layer cladding layer of zirconia, silica and alumina on the surface of titanium dioxide, but the multi-layer cladding process complex, harsh conditions
However, there is no report on coating rutile titanium dioxide with zirconia alone.

Method used

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  • Method for coating hydrous zirconium oxide on surface of rutile type titanium dioxide
  • Method for coating hydrous zirconium oxide on surface of rutile type titanium dioxide
  • Method for coating hydrous zirconium oxide on surface of rutile type titanium dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Disperse 75g of titanium dioxide particles in 750ml of deionized water, add about 6ml of sodium hexametaphosphate solution with a concentration of 50g / L as a dispersant to make a suspension, and ultrasonically disperse for 30min. The titanium oxide particles are basically in a single particle dispersion state. Then, the TiO 2 The suspension was moved to a constant temperature water bath at 80° C., and the temperature was kept constant. Under the condition of rapid stirring, the pH was adjusted to 7 with 0.5 mol / L NaOH solution. Use two constant flow pumps to mix 200ml, 0.1mol / L ZrOCl 2 (make it contain ZrO 2 Weight is TiO 2 3%) solution and 120ml concentration of 1% mass fraction of H 2 SO 4 solution was added to the TiO 2 suspension, ZrOCl was kept during the experiment 2 The feeding rate of solution is constant (feeding time 3h), adjust H at any time 2 SO 4 The feed rate was increased to ensure that the pH of the solution was 7. After the feed was completed, i...

Embodiment 2

[0021] Disperse 75g of titanium dioxide particles in 750ml of deionized water, add about 6ml of sodium hexametaphosphate solution with a concentration of 50g / L as a dispersant to make a suspension, and ultrasonically disperse for 30min. The titanium oxide particles are basically in a single particle dispersion state. Then, the TiO 2 The suspension was moved to a constant temperature water bath at 80°C, and the temperature was kept constant. Under the condition of rapid stirring, the pH was adjusted to 9 with 0.5 mol / L NaOH solution. Use two constant flow pumps to mix 200ml, 0.1mol / L ZrOCl 2 (make it contain ZrO 2 Weight is TiO 2 3%) solution and 120ml concentration of 1% mass fraction of H 2 SO 4 solution was added to the TiO 2 suspension, ZrOCl was kept during the experiment 2 The feeding rate of solution is constant (feeding time 3h), adjust H at any time 2 SO 4 The feed rate is to ensure that the pH of the solution is 9. After the feed is completed, it is aged for 1...

Embodiment 3

[0023] Disperse 75g of titanium dioxide particles in 750ml of deionized water, add about 6ml of sodium hexametaphosphate solution with a concentration of 50g / L as a dispersant to make a suspension, and ultrasonically disperse for 30min. The titanium oxide particles are basically in a single particle dispersion state. Then, the TiO 2 The suspension was moved to a constant temperature water bath at 80° C., and the temperature was kept constant. Under the condition of rapid stirring, the pH was adjusted to 11 with 0.5 mol / L NaOH solution. Use two constant flow pumps to mix 200ml, 0.1mol / L ZrOCl 2 (make it contain ZrO 2 Weight is TiO 2 3%) solution and 120ml concentration of 1% mass fraction of H 2 SO 4 solution was added to the TiO 2 suspension, ZrOCl was kept during the experiment 2 The feeding rate of solution is constant (feeding time 3h), adjust H at any time 2 SO 4 The feed rate is to ensure that the pH of the solution is 11. After the feed is completed, it is aged f...

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Abstract

The invention provides a method for coating hydrous zirconium oxide on the surface of rutile type titanium dioxide. The method comprises the following steps of: a, dispersing the rutile type titanium dioxide particles in deionized water and adding 50g / L solution of sodium hexametaphosphate serving as a dispersing agent to prepare a suspension, wherein the concentration of the rutile type titanium dioxide is 0.1g / ml; and the ultrasonical dispersion of the suspension is performed for 30 minutes, wherein the volume ratio of the solution of sodium hexametaphosphate to the suspension of titanium dioxide is 1:130; b, transferring the pulp prepared by the step a to a water bath at a constant temperature of between 50 and 80 DEG C and stirring, adjusting a pH value of the pulp to 7 to 11, adding 1 mass percent solution of zirconium oxychloride and sulfuric acid solution, and ageing the pulp for 2 hours while continuously stirring the pulp, wherein the adding amount of the solution of zirconium oxychloride is 1 to 5 percent of the weight of TiO2 based on ZrO2; and c, pump-filtering the pulp prepared by the step b, washing the pulp by deionized water, pump-filtering the filter cake until the conductivity of the filtrate is less than 20ms / m; and drying the filter cake by blasting at the temperature of 120 DEG C for 24 hours and crushing the filter cake to obtained the finished product.

Description

technical field [0001] The invention relates to a method for coating the surface of rutile titanium dioxide, in particular to a method of coating rutile titanium dioxide with zirconium oxychloride as a coating agent, rutile titanium dioxide as a base material, and a hydrated zirconia deposition method. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, has the advantages of high refractive index, strong decolorization power, high hiding power, good gloss and whiteness, high chemical inertness, and harmless to human body. It is an indispensable raw material for industries such as electronics, chemical industry, and metallurgy. Widely used in coatings, paper, ceramics, cosmetics, capacitors, etc. With the wide application of titanium dioxide, people have higher and higher requirements for the performance of titanium dioxide. Some specific fields have specific requirements for specific properties of titanium dioxide, such as high water dispersib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
Inventor 殷恒波张运生王爱丽陈维广卢章准刘纯姚恒平奉辉陈俊
Owner JIANGSU UNIV
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