Method for preparing TiO2/SiO2 composite powder

A composite powder, citric acid technology, applied in chemical instruments and methods, inorganic pigment processing, fibrous fillers, etc., can solve the problems of low utilization rate of sunlight, high processing temperature, high cost, shorten the preparation cycle, and reduce the particle size. The effect of uniform size and high yield

Inactive Publication Date: 2012-11-07
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0002] Titanium dioxide has the characteristics of non-toxic, harmless, high chemical stability, opacity, excellent whiteness and gloss, and good photocatalytic activity. It is an excellent white inorganic pigment and photocatalyst. However, due to the large band gap of titanium dioxide, it needs to be Electron-hole pairs can only be excited under near-ultraviolet light, and the utilization rate of sunlight is small, and there are disadvantages such as easy aggregation, easy deactivation, and difficulty in recycling.
Although the chemical vapor deposition method has the advantages of short cycle and low cost, its TiO 2 / SiO 2 Composite material particles have disadvantages such as wide particle size distribution, uneven particle size distribution, difficult control of Si / Ti ratio, and difficulty in mixing components uniformly, resulting in uneven chemical composition of the product.
The disadvantages of the traditional sol-gel method are high cost, high processing temperature, and easy agglomeration of primary particles.
Co-precipitation method has low production efficiency, the product is not easy to separate and control, and there are many impurities

Method used

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  • Method for preparing TiO2/SiO2 composite powder

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] A kind of TiO 2 / SiO 2 The preparation method of composite powder comprises the following steps:

[0023] 1) Deionized water and absolute ethanol were formulated into an ethanol solution at a volume ratio of 1.5:1; then 100ml of the ethanol solution was added to 12g of citric acid, 2ml of butyl titanate and 3.5g of polyethylene glycol to prepare a mixed solution;

[0024] Evaporate the mixed solution in a water bath at 80°C until a white wet gel is obtained, then dry and foam the wet gel at 130°C for 6 hours to form a brown-black xerogel; then calcinate the xerogel at 600°C for 6 hours TiO 2 submicron spheres;

[0025] 2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 25%, then add 0.5mol of ethyl orthosilicate, stir to dissolve the ethyl orthosilicate; after dissolving, add 100ml in sequence Dehydrated ethanol and 64.05g of polyethylene glycol (PEG4000), heated to 50 ° C and stirred to completely dissolve; adjust the...

Embodiment 2

[0029] A kind of TiO 2 / SiO 2 The preparation method of composite powder comprises the following steps:

[0030] 1) Deionized water and absolute ethanol were formulated into an ethanol solution at a volume ratio of 2:1; then 100ml of the ethanol solution was added to 17g of citric acid, 3ml of butyl titanate and 5.6g of polyethylene glycol to prepare a mixed solution;

[0031] Evaporate the mixed solution in a water bath at 90°C until a white wet gel is obtained, then dry and foam the wet gel at 140°C for 3 hours to form a brown-black xerogel; then calcinate the xerogel at 900°C for 2 hours TiO 2 submicron spheres;

[0032] 2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then add 0.67mol of ethyl orthosilicate, stir to dissolve the ethyl orthosilicate; after dissolving, add 150ml in turn 96.07g of absolute ethanol and 96.07g of polyethylene glycol (PEG4000), heated to 60°C and stirred to dissolve completely; adjust th...

Embodiment 3

[0036] A kind of TiO 2 / SiO 2 The preparation method of composite powder comprises the following steps:

[0037] 1) Deionized water and absolute ethanol were formulated into an ethanol solution at a volume ratio of 1.6:1; then 100ml of the ethanol solution was added to 15g of citric acid, 2.5ml of butyl titanate and 5.0g of polyethylene glycol to prepare a mixed solution;

[0038]Evaporate the mixed solution in a water bath at 85°C until a white wet gel is obtained, then dry and foam the wet gel at 135°C for 5 hours to form a brown-black xerogel; then calcinate the xerogel at 800°C for 4 hours TiO 2 submicron spheres;

[0039] 2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then add 0.62mol of ethyl orthosilicate, stir to dissolve the ethyl orthosilicate; after dissolving, add 120ml in sequence 80 g of absolute ethanol and 80 g of polyethylene glycol (PEG4000), heated to 60 ° C and stirred to dissolve completely; adju...

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Abstract

The invention discloses a method for preparing TiO2 / SiO2 composite powder, which comprises the following steps of: preparing wet gel from ethanol serving as a solvent, a citric acid serving as a complex and polyethylene glycol serving as a dispersant, and drying, foaming and calcining the wet gel to prepare submicron TiO2 spheres; and dispersing the submicron TiO2 spheres in SiO2-containing sol A, performing water-bath evaporation, drying and foaming with stirring to composite TiO2 and SiO2, and finally calcining the mixture to prepare the TiO2 / SiO2 composite powder. The method of the invention has the advantage of short preparation period, and the prepared TiO2 / SiO2 composite microspheres have the integrated sphericity of 0.5 to 2 mu m, and high purity and yield.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and relates to a TiO 2 / SiO 2 Preparation method of composite powder. Background technique [0002] Titanium dioxide has the characteristics of non-toxic, harmless, high chemical stability, opacity, excellent whiteness and gloss, and good photocatalytic activity. It is an excellent white inorganic pigment and photocatalyst. However, due to the large band gap of titanium dioxide, it needs to be The generation of electron-hole pairs can only be excited under near-ultraviolet light, which has a low utilization rate of sunlight, and has the disadvantages of easy aggregation, easy deactivation, and difficulty in recycling and reuse. In addition, due to the strong photocatalytic properties of titanium dioxide, when used as a coating, it is easy to cause yellowing and powdering of the paint film, while TiO2 2 / SiO 2 Composite powder can just improve these defects, thereby broadening the applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/06
Inventor 伍媛婷王秀峰
Owner SHAANXI UNIV OF SCI & TECH
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