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Super-hydrophobic composite porous film and preparation method thereof

A porous membrane, super-sparse technology, applied in special surfaces, pretreatment surfaces, devices for coating liquids on surfaces, etc., can solve problems such as high liquid breakthrough pressure, and achieve the effect of easy scale and simple preparation process

Inactive Publication Date: 2013-07-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a super-hydrophobic horizontal plate composite porous membrane and a preparation method thereof, so as to obtain a flat composite membrane with a nano-micro binary structure on the surface, the contact angle between the surface and water reaches more than 150°, and the rolling angle is less than 5°. And it has a high liquid breakthrough pressure, which can significantly improve the pollution problem in the process of membrane distillation treatment of high-salt wastewater

Method used

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  • Super-hydrophobic composite porous film and preparation method thereof
  • Super-hydrophobic composite porous film and preparation method thereof
  • Super-hydrophobic composite porous film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] First, the flat polyvinylidene fluoride membrane is washed with ethanol and deionized water in sequence, and dried to obtain a pretreated clean base membrane. Then weigh a certain proportion of hydrophobic nano-silica particles, polymethylsiloxane and butyl acetate, mix them with butyl acetate, and disperse them ultrasonically for 60 minutes to form nanoparticles with a mass fraction of 2% and polymethylsiloxane with a mass fraction of 3%. of spray liquid. Then, the spray liquid was evenly sprayed on the pre-treated polyvinylidene fluoride base film by spraying-precipitation method, and after natural drying at 30°C for 24 hours, a layer of superhydrophobic film was formed on the surface of the film. After testing, the surface of the obtained superhydrophobic polyvinylidene fluoride film has a contact angle of 156° with water, a rolling angle of less than 5°, and a thin layer of nanostructure on the surface of the film. The scanning electron micrograph of the surface of...

Embodiment 2

[0031] First, the polypropylene flat membrane was rinsed with ethanol and deionized water in sequence, and dried to obtain a pretreated clean base membrane. Then weigh a certain proportion of hydrophobic nano-titanium dioxide particles and polymethyl methacrylate series adhesives and mix them with acetone, and ultrasonically disperse them to form a spray solution with a mass fraction of nanoparticles of 5% and an adhesive mass fraction of 6%. Then, the spray liquid was evenly sprayed on the pre-treated polypropylene base film by spraying-precipitation method, and after natural drying at 40°C for 24 hours, a layer of superhydrophobic film was formed on the surface of the film. After testing, the contact angle between the surface of the obtained superhydrophobic polypropylene film and water was 162°, and the root mean square roughness of the film surface was increased to 177nm.

Embodiment 3

[0033] First, the flat polyvinylidene fluoride membrane is washed with ethanol and deionized water in sequence, and dried to obtain a pretreated clean base membrane. Then weigh a certain proportion of hydrophobic nano-zinc oxide particles and polymethylsiloxane adhesive, mix them with toluene, and disperse them ultrasonically for 60 minutes to form a spray solution with a mass fraction of nanoparticles of 10% and an adhesive mass fraction of 15%. . Then spray the spray liquid evenly on the pre-treated polyvinylidene fluoride base film by spraying-precipitation method, and after natural drying at 80°C for 10 hours, a layer of superhydrophobic film is formed on the surface of the film. After testing, the contact angle between the surface of the obtained superhydrophobic polyvinylidene fluoride film and water was 152°.

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Abstract

The invention relates to a super-hydrophobic composite porous film and a preparation method thereof. Main composite materials on the surface of the super-hydrophobic flat composite porous film are nano-particles, and the composting method of super-hydrophobic surface materials is a spraying-precipitating method. The surface of the composite porous film is provided with a flat composite film with a nano-micro dual structure, contact angle of the surface and water reaches larger than 150 degrees, and rolling angle is smaller than 5 degrees; main ingredients of a super-hydrophobic coating are nano-particles which comprise but are not limited to one or multiple combinations of nano-silica, nano titanium dioxide or nano zinc oxide. The preparation method includes: uniformly mixing hydrophobic nano-particles, adhesives and diluents to form spraying liquid; utilizing the spraying-precipitating method to uniformly spray the spraying liquid on the surface of a substrate film; drying a modified film sprayed with the nano-particles at the temperature of 15-80 DEG C for 10-40 hours, and obtaining the super-hydrophobic flat composite film. The super-hydrophobic composite porous film is simple in preparation process, free of expensive equipment and easy for large-scale production.

Description

technical field [0001] The invention relates to a super-hydrophobic composite porous film and a preparation method thereof, and a method for preparing the super-hydrophobic film by surface spraying technology. Background technique [0002] Membrane distillation (MD) is a new type of membrane process that uses a hydrophobic microporous membrane as the medium and is driven by the vapor pressure difference caused by the temperature difference on both sides of the membrane. It has the advantages of high separation efficiency, low operating temperature, and low energy consumption. It has a good application prospect in seawater desalination and sewage treatment. The membrane used for membrane distillation needs to meet the two requirements of hydrophobicity and porosity, so as to ensure that the feed liquid will not penetrate into the micropores and obtain a higher flux. At present, the preparation materials of hydrophobic membranes used in membrane distillation mainly include po...

Claims

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Application Information

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IPC IPC(8): B05D5/00B05D3/02C09D183/04C09D133/12C09D7/12
Inventor 李保安张婧
Owner TIANJIN UNIV
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