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Self-cleaning film and preparation thereof

A self-cleaning, thin-film technology, applied to special surfaces, pre-treating surfaces, devices for coating liquids on surfaces, etc. The effect of wide application and good self-cleaning properties

Inactive Publication Date: 2008-10-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a self-cleaning film and its simple preparation method, which overcomes the complexity of the previous superhydrophobic coating preparation method, low mechanical strength and high energy consumption, and is difficult to apply to industrial production. The preparation method solves the above technical difficulties

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0021] The preparation steps of the self-cleaning film are:

[0022] 1) Mix the raw material components according to the following weight fraction ratio: Orthosilicate (Si(OR) 4 ) 0.01-3 parts, absolute ethanol 4-9.5 parts, ammonia water 0.01-2 parts, water 0-1 part. Stir the above mixture vigorously at a certain temperature (0-100°C) for 0.1-4 hours to make it fully mixed, and coat various substrates with a thin film by pulling film-forming method, and remove the solvent from the film at 20-300°C Drying; in order to make the subsequent self-assembly reaction more complete, it can also be irradiated with ultraviolet light for 0.1-4h.

[0023] 2) Self-assemble the dried film in a solution of chlorosilane, alkoxysilane or fluorosilane (0.001M-5M) for 0.5-20 hours, and ultrasonically in ethanol for 5-10 minutes to obtain a transparent self-cleaning film.

[0024] Alternatively, you can also take the following steps:

[0025] Mix the raw material components according to the fol...

Embodiment 1

[0029] Take methyl orthosilicate (Si(OCH 3 ) 4 ) 1 part, 7.5 parts of absolute ethanol, 1 part of ammonia water, 0.5 part of water, and the above mixture was vigorously stirred at room temperature for 3 h. It is coated with a layer of film on the polyethylene substrate by dipping. After the film is dried at room temperature for 5 hours, it is placed in a solution of monomethyltrichlorosilane (0.5M, mol / L) and self-assembled for 2 hours. Self-cleaning film. The film has a water contact angle of up to 120° and a rolling angle of 20°.

Embodiment 2

[0031] Take methyl orthosilicate (Si(OCH 3 ) 4 ) 2 parts, 6.5 parts of absolute ethanol, 0.5 parts of ammonia water, and 1 part of water. Stir the above mixture vigorously at 40°C for 2 hours, then directly add dodecyltrimethoxysilane to control its concentration at 1M, and continue stirring 1h, stand for 5h, the coating film is obtained from the clean coating after drying at 50°C for 5h. The film has a water contact angle of up to 130° and a rolling angle of 20°.

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Abstract

The invention discloses self-cleaning film and the preparation method; the method provided by the invention and used for preparing the self-cleaning film is that the raw material mixtures are mixed, stirred and put into chlorosilane, alkoxy silane or fluoro-alkyl silanes solutions for self-assembly after film forming and drying; and then the self-cleaning film is obtained. The self-cleaning film and the preparation method are the break through in preparing the self-cleaning coating; the water contact angle of the film is above 150 degrees and the lag angle is less than 20 degrees; meanwhile, the mechanical intensity difference problem of the ultra-hydrophobic coating is effectively solved. The self-cleaning film in the invention has wide application range and can be coated on the surfaces of the materials including vehicle glasses, rearview mirrors, buildings and clothes, ensuring the surfaces of the materials to have the self-cleaning functions of waterproof, antifouling, frost prevention and snow cover prevention.

Description

technical field [0001] The invention relates to a self-cleaning film and a preparation method thereof. Background technique [0002] Coatings with superhydrophobic properties (the contact angle with water is greater than 150° and the hysteresis angle is small) have great application prospects in production and life. Due to the less contact area between the surface of these films and water, the chemical reactions that require water to occur and the formation of chemical bonds with water will not occur on the superhydrophobic surface. Correspondingly, various phenomena such as surface adsorption of snow and rain, surface oxidation, and frictional resistance will be correspondingly reduced or eliminated on the superhydrophobic surface. That is, they have what we usually call the self-cleaning function. Superhydrophobic doors and windows, building materials and exterior wall coatings with self-cleaning function are effective ways to solve rain and snow adhesion and dust pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/00B05D5/00B05D3/06
Inventor 卢晓英徐坚张小莉
Owner INST OF CHEM CHINESE ACAD OF SCI
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