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Titanium dioxide surface modification method

A technology of titanium dioxide and surface modification, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of complex steps of liquid-phase precipitation method, and achieve the effect of simple steps

Inactive Publication Date: 2010-06-16
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of complex steps in the liquid phase precipitation method in the prior art, the present invention provides a method for modifying the surface of titanium dioxide, the specific operations are as follows:

Method used

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Experimental program
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Effect test

Embodiment 1

[0034] Dry ground coated silica:

[0035] The sodium silicate nonahydrate (Na 2 SiO 3 9H 2 0), in the planetary ball mill, control the temperature of the grinding chamber to 40° C., and wash after 5000 r / min sand grinding for 10 h until the pH of the washing liquid=7. Dry in a 101-A type digital display electric blast drying oven at 80°C for 12 hours to obtain titanium dioxide whose surface is first coated with a silicon dioxide film.

Embodiment 2

[0037] Dry grinding coated aluminum oxide:

[0038] Aluminum sulfate octadecahydrate (Al 2 (SO 4 ) 3 18H 2 0), in the planetary ball mill, control the temperature of the grinding chamber to 30° C., and grind at 6000 r / min for 12 hours. Filtrate and wash until the pH of the washing solution is 7, and dry in a 101-A digital display electric blast drying oven at 90°C for 10 hours to obtain rutile nano-titanium dioxide whose surface is successively coated with a silicon dioxide film and an aluminum oxide film.

Embodiment 3

[0040] Dry grinding successively coated with silica and alumina:

[0041] Step 1: the nonahydrate sodium silicate (Na 2 SiO 3 9H 2 0), in the planetary ball mill, control the temperature of the grinding chamber to 40° C., and wash after 5000 r / min sand grinding for 10 h until the pH of the washing liquid=7. Dry in a 101-A type digital display electric blast drying oven at 80°C for 12 hours to obtain rutile nano-titanium dioxide whose surface is first coated with a silicon dioxide film.

[0042] Step 2: the titanium dioxide of step 1, the aluminum sulfate octadecahydrate of 5wt% titanium dioxide (Al 2 (SO 4 ) 3 18H 2 O), in the planetary ball mill, control the temperature of the grinding chamber to 30° C., and grind at 6000 r / min for 10 h. Filtrate and wash until the pH of the washing solution is 7, and dry in a 101-A digital display electric blast drying oven at 90°C for 10 hours to obtain rutile nano-titanium dioxide whose surface is successively coated with a silicon ...

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Abstract

The invention provides a titanium dioxide surface modification method, which comprises the following specific operations: i, using salt containing crystal water containing silicon and / or aluminum as an inorganic coating agent for dry grinding reaction to obtain titanium dioxide of which the surface is coated with silicon dioxide and / or aluminum oxide; and ii, filtering and washing the titanium dioxide obtained in the step i. Compared with a liquid precipitation method, the method of the invention has simple steps.

Description

technical field [0001] The present invention relates to the surface modification of titanium dioxide, especially the surface inorganic modification of titanium dioxide. Background technique [0002] The liquid phase precipitation method is one of the commonly used methods for surface inorganic coating of titanium dioxide. For example, when coating silicon or aluminum, first make titanium dioxide into a slurry with a certain concentration, and control the pH=10 and a certain temperature, and then slowly add sodium silicate (Na 2 SiO 3 ) or sodium aluminate (NaAlO 2 ) solution, adjust PH=6~8, then filter, wash and dry. The oxide coating layer formed by this method is uniform, continuous and dense, but the steps are complicated, and pH and temperature need to be strictly controlled. Contents of the invention [0003] In order to solve the problem of complex steps in the liquid phase precipitation method in the prior art, the present invention provides a method for modifyi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
Inventor 许静林香生杨柳林宏业宫清
Owner BYD CO LTD