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Anti-pollution degerming nanofiber filter membrane and preparation method thereof

A technology of nanofiber and filter membrane, which is applied in the field of anti-fouling and degerming nanofiber filter membrane and its preparation, which can solve the problems of large molecular chain spacing, reduced flux and anti-pollution performance, and failure to meet the sterilization requirements of high-end fields. , to achieve the effects of improving mechanical strength, green environmental protection, realizing large-scale production, and easy realization of large-scale production

Active Publication Date: 2021-01-22
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, under the pressure of 0.1MPa, the serum protein was passed through a polyethersulfone microporous filter with a pore size of 1.2 μm, and it was found that the volume of serum protein passing through in 10 minutes was 85L, and the filtration rate was 510L / h; it was measured by the Chinese Pharmacopoeia sterility test method The sterilization rate is 96.875%, which cannot meet the sterilization requirements of the high-end field
[0004] In addition, the commonly used raw materials for membrane production such as PVDF (polyvinylidene fluoride), PSF (polysulfone) or polyethersulfone (PES) are linear polymers, and the distance between molecular chains is large, which makes the desalination effect poor.
Although the body structure can be formed by cross-linking, the functional groups of the hydrophilic cross-linking monomers are cross-linked and the functional groups are consumed, thereby reducing the hydrophilicity of the membrane.
Since the hydrophilicity of the material has a great influence on the flux and antifouling performance of the membrane, the flux and antifouling performance are also reduced
At the same time, microorganisms and bacteria in the water will deposit and multiply on the surface of the sterilizing filter membrane during use, forming a biofilm and polluting the sterilizing filter membrane, resulting in a sharp decrease in the membrane flux.

Method used

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  • Anti-pollution degerming nanofiber filter membrane and preparation method thereof

Examples

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preparation example Construction

[0045] A preparation method of the above-mentioned antifouling and degerming nanofiber filter membrane, comprising the following steps:

[0046] S1. Prepare polyvinyl alcohol-ethylene copolymer nanofibers by melt blending phase separation method;

[0047] S2. Disperse the nanofibers obtained in step S1 in a mixed solution of isopropanol and deionized water with a mass ratio of 1:1, and stir evenly to obtain a polyvinyl alcohol-ethylene copolymer with a mass concentration of 5% to 20%. Suspension of nanofibers;

[0048] S3. Coating the polyvinyl alcohol-ethylene copolymer nanofiber suspension obtained in step S2 on a nonwoven fabric substrate, and drying at room temperature to obtain a nanofiber-coated filter membrane;

[0049] S4. The solution of the above-mentioned first grafting compound and / or the second grafting compound is soaked and adsorbed or coated on the surface of the nanofiber coating filter membrane obtained in step S3, and dried at room temperature;

[0050] S5...

Embodiment 1

[0056] An antifouling and degerming nanofiber filter membrane is prepared through the following steps:

[0057] S1. Prepare PVA-co-PE nanofibers by melt blending phase separation method, that is, blend and melt spin PVA-co-PE and cellulose acetate butyrate (CAB) to obtain composite fibers, and then use acetone to dissolve and extract the composite fibers. CAB in the fiber to obtain PVA-co-PE nanofibers with a diameter of 150nm;

[0058] S2. Disperse the PVA-co-PE nanofibers obtained in step S1 in a mixed solution of isopropanol and deionized water with a mass ratio of 1:1, and stir evenly to obtain PVA-co-PE with a mass concentration of 10%. PE nanofiber suspension;

[0059] S3. Coating the PVA-co-PE nanofiber suspension obtained in step S2 on a polypropylene nonwoven fabric substrate with an average pore size of 10 μm, and drying at room temperature to obtain a nanofiber-coated filter membrane; wherein , the thickness of the PVA-co-PE nanofiber coating is 6μm, and the avera...

Embodiment 2

[0064] An antifouling and degerming nanofiber filter membrane, compared with Example 1, the difference is that step S4 is: the first graft compound with the following structural formula is prepared into a solution with a mass concentration of 10%, and then The nanofiber coating filter membrane obtained in step S3 is soaked in the solution for 30 minutes, and dried at room temperature;

[0065]

[0066] Others are substantially the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides an anti-pollution degerming nanofiber filter membrane and a preparation method thereof. The preparation method comprises the following steps: preparing polyvinyl alcohol-ethylene copolymer nanofibers with a diameter of 50-300 nm by adopting a melt blending phase separation method; then preparing a suspension, and coating the surface of a non-woven fabric base material to obtain a nanofiber thin layer with a thickness of 2-10 [mu]m and a pore diameter of 90-130 nm; and after a grafted compound is adsorbed on the surface of the nanofiber thin layer, carrying out plasma treatment to form chemical bonding grafting so as to obtain the nanofiber filter membrane with anti-pollution and sterilization functions is obtained. According to the invention, an amphiphilic compoundand / or a compound containing olefin double bonds and at least one of carboxyl and sulfonic acid groups are grafted on the surface of a polyvinyl alcohol-ethylene copolymer nanofiber membrane, so thatbacteria can be efficiently intercepted, and the adsorption of BSA can be reduced so as to inhibit the adsorption growth of bacteria on the surface of the membrane and significantly improve the anti-pollution capability of the membrane.

Description

technical field [0001] The invention belongs to the technical field of filter membranes, in particular to an anti-fouling and bacteria-removing nanofiber filter membrane and a preparation method thereof. Background technique [0002] Filtration sterilization technology has broad and attractive application prospects in the fields of biopharmaceuticals, food and beverage, medical treatment, chemical electronics, air purification, water treatment, and environmental protection. As the core of filtration and sterilization technology, the sterilization membrane affects and restricts the development and application of filtration and sterilization technology. Filtration sterilization is to pass the solution, gas, etc. that need to be sterilized, such as some pharmaceutical solutions, through a sterile specific filter membrane to remove live or dead microorganisms to obtain a microorganism-free filtrate or gas. For example: the use of filter membranes to remove microorganisms in sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D69/02B01D67/00
CPCB01D71/78B01D69/02B01D67/0011B01D2325/48
Inventor 程芹王栋刘轲贾晓丹程盼胡威周鹏程武艺郭启浩徐佳
Owner WUHAN TEXTILE UNIV
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