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Transparent titania super-hydrophilic coating using organosilicon as underlayment and preparation thereof

A technology of substrate layer and titanium oxide, applied in the direction of coating, etc., can solve the problems that the degree of light radiation is difficult to improve the photocatalytic efficiency, the particles are easy to lose, and it is difficult to adopt. It achieves good super-hydrophilic and anti-fog performance, convenient operation, The effect of simple process route

Inactive Publication Date: 2008-06-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the initial stage of photocatalysis, titanium oxide is suspended in the solution as dispersed particles. Because the particles are easy to lose and difficult to recycle, and the blocking and absorption of light by suspended particles exceeding a certain limit concentration will seriously affect the radiation level of light. It is difficult to improve the photocatalytic efficiency, so it is difficult to adopt in practice

Method used

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  • Transparent titania super-hydrophilic coating using organosilicon as underlayment and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, titanium tetrachloride is used as a precursor, and a stable and dispersed titanium oxide sol is prepared by a common hydrolysis process. Take tetramethoxysilane and ethyl orthosilicate with a volume ratio of 1:2 and mix them uniformly in methanol solution, then add nitric acid and deionized water to hydrolyze at 60°C for 16 hours to obtain a transparent silica sol, in which nitric acid and deionized water The volume ratio to the mixed solution is 1:2:10. The titanium oxide sol with a mass percentage of 2% and the silica sol are uniformly mixed according to a volume ratio of 2:1 to obtain a surface layer coating liquid. Add 10mL tetraethyl orthosilicate to 150mL of absolute ethanol, slowly add 2mL of 0.1M nitric acid dropwise under vigorous stirring, continue stirring for 1h after the dropwise addition, add dropwise 20mL of 3-aminopropyltriethoxysilane in ethanol solution, and continued to stir for 2h to obtain the bottom layer coating solution. Clean the surfac...

Embodiment 2

[0030]First, titanium tetrachloride is used as a precursor, and a stable and dispersed titanium oxide sol is prepared by a common hydrolysis process. Take tetramethoxysilane and ethyl orthosilicate with a volume ratio of 1:2 and mix them uniformly in methanol solution, then add nitric acid and deionized water to hydrolyze at 60°C for 16 hours to obtain a transparent silica sol, in which nitric acid and deionized water The volume ratio to the mixed solution is 1:2:10. The titanium oxide sol with a mass percentage of 2% and the silica sol are uniformly mixed according to a volume ratio of 2:1 to obtain a surface layer coating liquid. Spray the surface coating solution directly onto the surface of the cleaned polycarbonate substrate, and it is found that the surface tension of the coating solution is extremely high, and the film is dried at 80°C for 2 hours, and severe cracking occurs, and the adhesion of the film is very poor. . It shows that the use of organic silicon as the ...

Embodiment 3

[0032] Transparent titanium oxide super-hydrophilic coating was prepared on the surface of glass according to the technique of Example 1, and the light transmittance of the glass dropped from 96% to 91% after the film coating three times, and remained transparent substantially, and the glass after the film coating had and The polycarbonate substrate has similar superhydrophilic properties, and no droplets appear on the surface under steam baking, showing a good anti-fog function.

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Abstract

The invention relates to a transparent super-hydrophile coating of titanium oxide by adopting organic silicon as a substrate layer and a preparing method thereof.The invention is essentially characterized in that: a transparent super-hydrophile film of the titanium oxide is prepared on the surface of the glass, varnish and plastic base material; the film is firmly combine with the base material through the substrate of the organic silicon; the film is unnecessary to be sintered in high temperature and has favorable super-hydrophilicity and photocatalysis activity.The substrate material of the organic silicon is the product after mixture and hydrolysis of 3-aminopropyl triethoxysilane and teos; coating fluid is the mixture combining the hydrolyzed products of oxygen radix silane and the teos with titanium sol.The provided method has low cost, simple process, stable quality and is friendly to the environment; the light transmission rate of the prepared transparent super-hydrophile coating of titanium oxide is more than 90 percent; best wetting angle of the water is 4.4 degrees while the best wetting angle of atoleine is 6 degree; the invention has favorable super-hydrophilicity.

Description

technical field [0001] The invention relates to a transparent titanium oxide superhydrophilic coating with organic silicon as the substrate layer and its preparation method, more precisely, it provides a method for preparing transparent titanium oxide superhydrophilic coating on the surface of glass, paint film or plastic substrate with organic silicon as the substrate layer. The water coating belongs to the chemical industry field. Background technique [0002] Photocatalytic technology has broad application prospects in the field of environmental protection, solar energy utilization, organic synthesis, self-cleaning material production and other fields, and is one of the most active research fields at home and abroad in recent years. Since the 1990s, the application research of photocatalytic technology has attracted more and more attention. Extensive and in-depth research has proved that many semiconductor materials have photocatalysis, and the mechanism of photocatalysi...

Claims

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Application Information

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IPC IPC(8): C03C17/42C08J7/06
Inventor 高濂谢晓峰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI