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Super-hydrophobic air filtering membrane as well as preparation method and application thereof

An air filtration and super-hydrophobic technology, which is applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of small ventilation of exhaust filters, low tensile strength, and low production capacity of electrospinning methods. To achieve the effect of improving water blocking performance and uniform force

Active Publication Date: 2016-01-20
上海佩弘新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are following problems in the preparation method of the air filter membrane reported in the above-mentioned document: 1, what CN104971630A announced the air filter composite membrane of the polyolefin adopted is that thermally induced phase separation process is prepared, and this process method needs to dissolve polymer in high boiling point, A homogeneous solution is formed in a low-volatility solvent, and then cooled to form a phase separation process. The membrane prepared by this method has a low porosity and requires high equipment performance in the industrial production process.
2. The air filter membrane announced by Pall Company adopts the casting solution phase inversion process to prepare the corresponding air filter membrane. The prepared air filter membrane has high water resistance performance, but there is a ventilation problem in the specific application of the exhaust filter. small amount of defects
3. The process of hydrophobic and oleophobic air filter membrane disclosed in CN104888628A patent is composited into the corresponding non-woven fabric by electrospinning method. The production capacity of electrospinning method is low, which is not conducive to large-scale production. At the same time, electrospinning method can obtain The low strength of the fiber filaments causes the tensile strength of the prepared film to be low, which is not conducive to practical application

Method used

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  • Super-hydrophobic air filtering membrane as well as preparation method and application thereof
  • Super-hydrophobic air filtering membrane as well as preparation method and application thereof
  • Super-hydrophobic air filtering membrane as well as preparation method and application thereof

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preparation example Construction

[0064] As mentioned above, the present invention relates to a method for preparing a super-hydrophobic air filter membrane, which is an immersion gel phase inversion method, and is a kind of phase inversion method. The super-hydrophobic air filter membrane prepared by the present invention has a separation layer of only 0.1-1 μm, low permeation resistance, and high air flow (under 10KPa, the air flow of a filter membrane with a diameter of 12 mm can reach 3400-4800mL / min), and Has a good water resistance (up to 42KPa). The prepared film of the present invention can be used for medical treatment (as the air intake part in the infusion set), machine (as the filter screen of the engine cylinder), air purification equipment (as the microporous filter screen in the air purifier), spraying, electronics, Plastic and other industries.

[0065] As mentioned above, the present invention has prepared chlorinated polyvinyl chloride superhydrophobic air filter membrane for the first time....

Embodiment 1

[0070] In the first step, 10 parts of PVDF (with a molecular weight of 250,000 to 1,000,000) and 71 parts of N,N-dimethylacetamide were placed in a three-necked flask, and stirred at 25°C for 30 minutes to obtain a clear solution.

[0071] In the second step, add 1 part of nano-silica, 12 parts of ethanol, 5 parts of polyvinylpyrrolidone K30, and 2 parts of fluorocarbon acrylate (Scotchgard) into the above-mentioned three-necked flask, stir and heat at 50°C for 5 hours until completely dissolved , standing for degassing for 2 hours to obtain a casting solution.

[0072] In the third step, the non-woven fabric made of polypropylene (PP) is soaked in the beaker filled with the casting solution, so that the whole body of the non-woven fabric is soaked in the casting solution. Then, a liquid film with a certain thickness is scraped with a scraper to obtain a polymer film intermediate supported by a non-woven fabric; then placed in the air and exposed for 30 seconds to dry.

[0073]...

Embodiment 2

[0076] In the first step, 15 parts of chlorinated polyvinyl chloride (CPVC) (molecular weight: 250,000 to 360,000) and 72 parts of N,N-dimethylacetamide were placed in a three-necked flask, and stirred at 25°C for 30 minutes. A clear solution was obtained.

[0077] The second step, then, add 9 parts of ethanol, 3 parts of polyvinylpyrrolidone K30, and 1 part of fluorocarbon acrylate (Scotchgard) into the above-mentioned three-necked flask, heat and stir at 50°C for 5 hours until completely dissolved, and let stand for defoaming for 2 hours, the casting solution was obtained.

[0078] In the third step, the non-woven fabric made of polypropylene (PP) is soaked in the beaker filled with the casting solution to ensure that the whole non-woven fabric is soaked in the casting solution. Then, use a scraper to form a liquid film with a certain thickness to obtain a polymer film intermediate supported by a non-woven fabric; then place it in the air and expose it for 30 seconds to dry...

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Abstract

The invention relates to a super-hydrophobic air filtering membrane as well as a preparation method and application thereof. The method comprises the following steps: a, mixing a suitable polymer material with an organic solvent capable of dissolving the polymer material to obtain a clarified polymer solution; b, adding a pore-foaming agent matched with the polymer solution into the polymer solution and stirring to obtain a clarified mixture solution A; adding a low-surface tension auxiliary agent into the mixture solution A and stirring to obtain a clarified mixture solution B; and c, standing, curing and de-foaming the mixture solution B obtained in the step b to obtain a membrane casting solution. The super-hydrophobic air filtering membrane prepared by adopting the method provided by the invention has the advantages that a water resistance performance is good, the ventilation rate is high, the process is simple and easy to operate, parameters are uniform and the like, which cannot be realized by adopting present common methods and processes. The membrane is applicable to the fields of medical treatment (such as air inlet parts in infusion apparatuses), machines (such as filter screens of engine air cylinders), air purification equipment (such as micro-pore filter screens in air purifiers), spraying, electrons, plastic and the like.

Description

technical field [0001] The invention relates to a superhydrophobic air filter membrane, a preparation method and application thereof, and relates to the technical field of membrane preparation. Background technique [0002] In recent years, superhydrophobic membranes have been widely used in many fields such as air filtration, industrial gas filtration, organic solvent purification, membrane distillation, gas separation, pervaporation, emulsification, and dehydration. Therefore, the preparation of superhydrophobic membranes has become a hotspot in academic and industrial research. The contact angle of water on the surface of the membrane is greater than 150° for superhydrophobicity. According to different materials, it can be divided into inorganic membranes and organic membranes, of which polymer organic membrane materials account for more than 95%. Super-hydrophobic surfaces are generally constructed on the surface of low-surface-energy hydrophobic materials with micro-n...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/34B01D71/30B01D71/42B01D53/22
Inventor 江润生薛峥
Owner 上海佩弘新材料技术有限公司
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