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Super-hydrophilic self-cleaning antifogging composite film, and preparation method and application thereof

A composite film and super-hydrophilic technology, applied in the field of super-hydrophilic self-cleaning anti-fog composite film and its preparation, can solve the problems of low utilization rate of sunlight and low quantum efficiency, and achieve simple process flow and fast operation. Simple and good photocatalytic activity

Active Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However TiO 2 The low utilization rate of sunlight (Eg=3.2 eV) and low quantum efficiency limit its practical application

Method used

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  • Super-hydrophilic self-cleaning antifogging composite film, and preparation method and application thereof
  • Super-hydrophilic self-cleaning antifogging composite film, and preparation method and application thereof
  • Super-hydrophilic self-cleaning antifogging composite film, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The present invention uses a sol-gel process. 5g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) dissolved in 4.2 mL HNO 3 Then add 2 g citric acid, 4 mL Triton X-100 (OP), 2 mL polyethylene glycol 200 and 10 mL acetone, stir for 5 h, then add copper sulfate pentahydrate (CuSO 4 ·5H 2 O), and then stirred again (where the stirring speed was 25 r / min and the temperature was 30°C) for 3 h to obtain Cu-Bi with a molar ratio of n(Cu):n(Bi)=5%. 2 o 3 sol; tetraethyl orthosilicate (TEOS) was dissolved in absolute ethanol (EtOH), and then added dropwise to polyoxyethylene (4) ether lauryl alcohol (Brij R 30) In the mixed solution with hydrochloric acid, the mixed solution of the reactants was obtained, and then stirred in a collector type constant temperature heating magnetic stirrer (where the stirring speed was 20 r / min, and the temperature was 30°C) to obtain SiO 2 Sol, of which tetraethyl orthosilicate: Brij R30: hydrochloric acid: absolute ethanol=8: 0.9: 1: 50...

Embodiment 2

[0031] The present invention uses a sol-gel process. 6g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) dissolved in 5.5 mL HNO 3 Then add 2.5 g citric acid, 5 mL Triton X-100 (OP), 2.5 mL polyethylene glycol 200 and 13 mL acetone, stir for 5.5 h, then add copper sulfate pentahydrate (CuSO 4 ·5H 2 O), and then stirred again (where the stirring speed was 20 r / min and the temperature was 35°C) for 2.5 h to obtain Cu-Bi with a molar ratio of n(Cu):n(Bi)= 3%. 2 o 3 sol; tetraethyl orthosilicate (TEOS) was dissolved in absolute ethanol (EtOH), and then added dropwise to polyoxyethylene (4) ether lauryl alcohol (Brij R 30) In the mixed solution with hydrochloric acid, the mixed solution of the reactants was obtained, and then stirred in a collector type constant temperature heating magnetic stirrer (where the stirring speed was 25 r / min, and the temperature was 35°C) to obtain SiO 2 Sol, of which tetraethyl orthosilicate: Brij R 30: hydrochloric acid: absolute ethanol=24:...

Embodiment 3

[0033] The present invention uses a sol-gel process. With 7.5g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) dissolved in 6.3 mL HNO 3 Then add 3 g citric acid, 6 mL Triton X-100 (OP), 3 mL polyethylene glycol 200 and 15 mL acetone, stir for 6 h, then add copper sulfate pentahydrate (CuSO 4 ·5H 2 O), and then stirred again (where the stirring speed was 15 r / min, and the temperature was 25°C) for 2 h to obtain Cu-Bi with a molar ratio of n(Cu):n(Bi)=7%. 2 o 3 sol; tetraethyl orthosilicate (TEOS) was dissolved in absolute ethanol (EtOH), and then added dropwise to polyoxyethylene (4) ether lauryl alcohol (Brij R 30) In the mixed solution with hydrochloric acid, the mixed solution of the reactants was obtained, and then stirred in a collector type constant temperature heating magnetic stirrer (the stirring speed was 15 r / min, and the temperature was 25°C) to obtain SiO 2 Sol, of which tetraethyl orthosilicate: Brij R 30: hydrochloric acid: absolute ethanol=32: 0.9: 1...

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Abstract

The invention discloses a super-hydrophilic self-cleaning antifogging composite film, and a preparation method and application thereof. The composite film has a two-layer structure and comprises a bottom film and a surface film, wherein the bottom film is a Cu-modified Bi2O3 film, and the surface film is a mesoporous SiO2 film. The preparation method comprises the following steps: coating a Cu-modified Bi2O3 film on the surface of common glass, drying the wet film, carrying out heat treatment in a muffle furnace, coating a mesoporous SiO2 film on the surface, and carrying the same treatment process to obtain the laminated composite film. The film has favorable photocatalytic activity under visible light or weak ultraviolet light, has super-hydrophilicity even under dark conditions, is colorless and transparent and has stable performance. The method has the advantages of simple equipment, low investment and no environment pollution; and the prepared film can be widely used on glass curtain walls, bathroom mirrors, automobile glass, optical instrument components and other substrates in need of self-cleaning antifogging treatment.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a superhydrophilic self-cleaning anti-fog composite film and its preparation method and application. Background technique [0002] With the development of social economy, people pay more and more attention to the problem of environmental pollution. Among them, the cleaning of various indoor and outdoor building materials (such as cleaning of glass) has also attracted widespread attention. When pollutants in the air adhere to building glass or automobile window glass, it not only reduces the light transmittance of the glass, but also affects the appearance. In addition, when humid air condenses, it is easy to condense on the surface of the glass to form many tiny water droplets. Due to the scattering effect of these water droplets, the light transmittance of the glass is affected, which brings inconvenience to people, especially in rainy days. The fog dro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/34C03C17/25
Inventor 胡芸单文杰韦朝海
Owner SOUTH CHINA UNIV OF TECH
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