CN103127842A - Manufacturing method of hydrophilic teflon microporous membrane - Google Patents
Manufacturing method of hydrophilic teflon microporous membrane Download PDFInfo
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- CN103127842A CN103127842A CN2013100485173A CN201310048517A CN103127842A CN 103127842 A CN103127842 A CN 103127842A CN 2013100485173 A CN2013100485173 A CN 2013100485173A CN 201310048517 A CN201310048517 A CN 201310048517A CN 103127842 A CN103127842 A CN 103127842A
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Abstract
The invention relates to a modified method of a teflon microporous membrane, in particular to the method for improving the teflon microporous membrane to be a hydrophilic teflon microporous membrane. The manufacturing method of the hydrophilic teflon microporous membrane comprises the following steps. The teflon microporous membrane is steeped into a nonpolar organic solvent, taken out from the nonpolar organic solvent and steeped into a poval water solution under the temperature of 70 DEG C to 90 DEG C, and then taken out from the poval water solution and steeped into finishing liquid for drying so as to manufacture the hydrophilic teflon microporous membrane. Hydrophily of the membrane is improved under the condition that physical properties of the teflon microporous membrane is not damaged. Filtering performance of the teflon microporous membrane in a water processing industry is improved, and water flux is improved by 60 percent to 80 percent under a water pressure test of 0.1MPa.
Description
Technical field
The present invention relates to a kind of method of modifying of microporous teflon membran, be specifically related to the method for hydrophilic polyfluortetraethylemicroporous microporous membrane that microporous teflon membran is modified as.
Background technology
By polypropylene, the diffusion barrier of the material such as Kynoar, polysulfones preparation develops rapidly, in numerous separation membrane materials, the microporous teflon membran standby by the biaxial tension legal system is popular because its excellent combination property is standby, but the hydrophobicity of polytetrafluoroethylene (PTFE) itself has limited its application, therefore need it is carried out hydrophilic modifying, the hydrophilic modifying of microporous teflon membran mainly comprises the methods such as blend, irradiation, plasma-activated, surface free radical copolymerization.
Application number is the preparation method that the Chinese invention patent of 200510060886.X discloses a kind of polytetra fluorethylene hydrophilic micro filtering membrane, adopts polyflon and polyvinyl alcohol blending, prepares hydrophilic polyfluortetraethylemicroporous microporous membrane by biaxial tension.But polyvinyl alcohol is water miscible powder, and polyflon is a kind of powder of hydrophobicity, because difference is too large in nature, polyvinyl alcohol add membership appreciable impact stretched polytetrafluoroethylene film strength.in this application file, the addition of polyvinyl alcohol is 0～5wt%, this document is also pointed out simultaneously, at first to solve the consistency problem of polytetrafluoroethylene (PTFE) and polyvinyl alcohol, guaranteeing the hydrophilic consumption that will as far as possible reduce simultaneously polyvinyl alcohol, this is favourable to the premium properties that keeps polytetrafluoroethylene (PTFE), the activation problem of the hydrophilic radical of its less important solution polyvinyl alcohol, because polyvinyl alcohol and polytetrafluoroethylblended blended after, will be through extruding, calendering, the steps such as stretching, polyvinyl alcohol irregularly is scattered in each position of stretched polytetrafluoroethylene film, only be distributed in the hydrophilic radical competence exertion performance of the polyvinyl alcohol of stretched polytetrafluoroethylene film outside, therefore need to activate.Therefore, the not only water flowing performance of hydrophilic polyfluortetraethylemicroporous film that adopts the method to make is not high, also can reduce the intensity of poly tetrafluoroethylene.
Goal of the invention
The objective of the invention is provides a kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane for solving the hydrophobicity problem of poly tetrafluoroethylene.Adopt the hydrophilic polyfluortetraethylemicroporous microporous membrane of the inventive method preparation can significantly promote its hydrophily when keeping intensity, promote its strainability.
Above-mentioned technical purpose of the present invention is achieved by technical scheme once:
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane is characterized in that, comprises the following steps:
(1) swelling treatment: microporous teflon membran is immersed in non-polar organic solvent, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:49 ~ 99, makes the polyvinyl alcohol water solution of 70 ~ 90 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 70 ~ 90 ℃, take out after dipping, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:0.5 ~ 1.5:70 ~ 100 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, take out after dipping, dry in baking oven, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
Preferred as technique scheme, in swelling treatment, described non-polar organic solvent is one or more of n-hexane, acetone and benzene.
Preferred as technique scheme, in swelling treatment, the temperature of n-hexane is 30～60 ℃.
Preferred as technique scheme, in swelling treatment, the temperature of n-hexane is 40～50 ℃.
Preferred as technique scheme, in rear arrangement process, the temperature of rear dressing liquid is 0～100 ℃.
Preferred as technique scheme, in rear arrangement process, the temperature of rear dressing liquid is 20～80 ℃.
Preferred as technique scheme, in rear arrangement process, the temperature of rear dressing liquid is 40～60 ℃.
Preferred as technique scheme, in rear arrangement process, the temperature when dry in baking oven is 80～120 ℃.
Preferred as technique scheme, in the swelling treatment process, the aperture of described microporous teflon membran is 0.45 ~ 10 micron.
Preferred as technique scheme, in the hydrophilic modifying process, the mass ratio of polyethylene alcohol and water is 1:69 ~ 99, the dip time of hydrophilic modifying 〉=30 minute; The mass ratio of glutaraldehyde, acetic acid and water is 1:(1.0～1.5): (80～100), the dip time of rear arrangement modification 〉=10 minute, the temperature of rear dressing liquid is 0～100 ℃; Temperature when dry in baking oven is 80～120 ℃.
In technique scheme of the present invention, adopt the wetting microporous teflon membran of non-polar organic solvent, make microporous teflon membran obtain swelling, with this understanding, polyvinyl alcohol just easily enters the inside of microporous teflon membran, thereby obtain temporary hydrophilic microporous teflon membran, at last by the processing of rear dressing liquid, obtain hydrophilic microporous teflon membran.Do not affect the preparation of microporous teflon membran due to the inventive method, therefore do not affect the bulk properties of microporous teflon membran yet, and have advantage easy and simple to handle, that cost is low.
The present invention has following technique effect:
The present invention has improved the hydrophily of film on the basis of the physical property of not losing microporous teflon membran, improved its strainability in water treatment field.Under the water pressure test of 0.1MPa, water flux has approximately improved 60～80%.
The specific embodiment
This specific embodiment is only that explanation of the invention is not limitation of the present invention.Those skilled in the art are after having read specification of the present invention, and any change of having done all will be subject to the protection of Patent Law as long as within the claim limited range.
Embodiment one
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 0.45 micron is immersed in n-hexane with the aperture, the time is 5 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1799 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:49, makes the polyvinyl alcohol water solution of 70 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 70 ℃, flood after 30 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:0.5:70 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 10 minutes and take out, dry in 80 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 60%.
Embodiment two
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 10 microns is immersed in n-hexane with the aperture, the time is 10 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1588 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:99, makes the polyvinyl alcohol water solution of 90 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 90 ℃, flood after 60 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:1.5:100 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 30 minutes and take out, dry in 120 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 80%.
Embodiment three
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 5 microns is immersed in n-hexane with the aperture, the time is 7 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1799 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:66, makes the polyvinyl alcohol water solution of 80 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 80 ℃, flood after 45 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:1:80 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 20 minutes and take out, dry in 100 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 70%.
Embodiment four
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 0.45 micron is immersed in acetone with the aperture, the time is 5 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1799 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:49, makes the polyvinyl alcohol water solution of 70 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 70 ℃, flood after 30 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:0.5:70 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 10 minutes and take out, dry in 80 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 60%.
Embodiment five
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 10 microns is immersed in acetone with the aperture, the time is 10 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1588 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:99, makes the polyvinyl alcohol water solution of 90 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 90 ℃, flood after 60 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:1.5:100 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 30 minutes and take out, dry in 120 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 80%.
Embodiment six
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 5 microns is immersed in acetone with the aperture, the time is 7 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1799 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:66, makes the polyvinyl alcohol water solution of 80 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 80 ℃, flood after 45 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:1:80 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 20 minutes and take out, dry in 100 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 70%.
Embodiment seven
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 0.45 micron is immersed in benzene with the aperture, the time is 5 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1799 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:49, makes the polyvinyl alcohol water solution of 70 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 70 ℃, flood after 30 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:0.5:70 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 10 minutes and take out, dry in 80 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 60%.
Embodiment eight
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 10 microns is immersed in benzene with the aperture, the time is 10 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1588 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:99, makes the polyvinyl alcohol water solution of 90 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 90 ℃, flood after 60 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:1.5:100 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 30 minutes and take out, dry in 120 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 80%.
Embodiment nine
A kind of preparation method of hydrophilic polyfluortetraethylemicroporous microporous membrane comprises the following steps:
(1) swelling treatment: be that the microporous teflon membran of 5 microns is immersed in benzene with the aperture, the time is 7 minutes, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol 1799 is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:66, makes the polyvinyl alcohol water solution of 80 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 80 ℃, flood after 45 minutes and take out, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:1:80 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, flood after 20 minutes and take out, dry in 100 ℃ of baking ovens, obtain hydrophilic polyfluortetraethylemicroporous microporous membrane.
By the hydrophilic polyfluortetraethylemicroporous microporous membrane that said method obtains, under the water pressure test of 0.1MPa, water flux improves 70%.
Claims (10)
1. the preparation method of a hydrophilic polyfluortetraethylemicroporous microporous membrane, is characterized in that, comprises the following steps:
(1) swelling treatment: microporous teflon membran is immersed in non-polar organic solvent, obtains the microporous teflon membran of swelling;
(2) hydrophilic modifying: polyvinyl alcohol is dissolved in water, and the mass fraction of polyethylene alcohol and water is 1:49 ~ 99, makes the polyvinyl alcohol water solution of 70 ~ 90 ℃; The microporous teflon membran of described swelling be impregnated in the polyvinyl alcohol water solution of described 70 ~ 90 ℃, take out after dipping, obtain temporary hydrophilic microporous teflon membran;
(3) arrange after: the ratio that is 1:0.5 ~ 1.5:70 ~ 100 in mass fraction with glutaraldehyde, acetic acid, water is mixed with rear dressing liquid; Described temporary hydrophilic microporous teflon membran be impregnated in described rear dressing liquid, take out after dipping, oven dry obtains hydrophilic polyfluortetraethylemicroporous microporous membrane.
2. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 1, it is characterized in that: in swelling treatment, described non-polar organic solvent is n-hexane.
3. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 2, it is characterized in that: in swelling treatment, the temperature of n-hexane is 30～60 ℃.
4. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 2, it is characterized in that: in swelling treatment, the temperature of n-hexane is 40～50 ℃.
5. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 1 is characterized in that: in rear arrangement process, the temperature of rear dressing liquid is 0～100 ℃.
6. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 1 is characterized in that: in rear arrangement process, the temperature of rear dressing liquid is 20～80 ℃.
7. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 1 is characterized in that: in rear arrangement process, the temperature of rear dressing liquid is 40～60 ℃.
8. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 1 is characterized in that: in rear arrangement process, the temperature when oven dry is 80～120 ℃.
9. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 1, it is characterized in that: in the swelling treatment process, the aperture of described microporous teflon membran is 0.45 ~ 10 micron.
10. the preparation method of a kind of hydrophilic polyfluortetraethylemicroporous microporous membrane according to claim 1, it is characterized in that: in the hydrophilic modifying process, the mass ratio of polyethylene alcohol and water is 1:69 ~ 99, the dip time of hydrophilic modifying 〉=30 minute; The mass ratio of glutaraldehyde, acetic acid and water is 1:(1.0～1.5): (80～100), the dip time of rear arrangement modification 〉=10 minute, the temperature of rear dressing liquid is 0～100 ℃; Temperature when dry in baking oven is 80～120 ℃.
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Cited By (8)
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| CN103394296A (en) * | 2013-07-18 | 2013-11-20 | 湖州森诺氟材料科技有限公司 | Teflon ultramicro water filtering membrane for flat plate type MBR (membrane bioreactor) and preparation method thereof |
| CN103483618A (en) * | 2013-10-11 | 2014-01-01 | 苏州汇龙膜技术发展有限公司 | Hydrophilic modification method of polytetrafluoroethylene porous membrane |
| CN103481528A (en) * | 2013-09-04 | 2014-01-01 | 湖州森诺氟材料科技有限公司 | Biaxially-oriented porous expanded polytetrafluoroethylene expanded hollow tubular membrane and preparation method thereof |
| CN106430829A (en) * | 2016-10-26 | 2017-02-22 | 南宁市桂润环境工程有限公司 | Lead and zinc industrial wastewater treatment device and method |
| CN106902641A (en) * | 2017-03-21 | 2017-06-30 | 亚美滤膜（南通）有限公司 | The hydrophilically modified processing method of semi-permeable filter membrane and macromolecule plastic film |
| CN108993174A (en) * | 2018-08-20 | 2018-12-14 | 宁波昌祺微滤膜科技有限公司 | A kind of ePTFE hydrophilic film of resistance to sodium hypochlorite and its preparation method and application |
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| CN112619451A (en) * | 2020-11-27 | 2021-04-09 | 宁波职业技术学院 | Preparation method of hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103394296A (en) * | 2013-07-18 | 2013-11-20 | 湖州森诺氟材料科技有限公司 | Teflon ultramicro water filtering membrane for flat plate type MBR (membrane bioreactor) and preparation method thereof |
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| CN103481528A (en) * | 2013-09-04 | 2014-01-01 | 湖州森诺氟材料科技有限公司 | Biaxially-oriented porous expanded polytetrafluoroethylene expanded hollow tubular membrane and preparation method thereof |
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| CN106430829A (en) * | 2016-10-26 | 2017-02-22 | 南宁市桂润环境工程有限公司 | Lead and zinc industrial wastewater treatment device and method |
| CN106902641A (en) * | 2017-03-21 | 2017-06-30 | 亚美滤膜（南通）有限公司 | The hydrophilically modified processing method of semi-permeable filter membrane and macromolecule plastic film |
| CN106902641B (en) * | 2017-03-21 | 2021-04-02 | 亚美滤膜（南通）有限公司 | Hydrophilic modification treatment method for semi-permeable filter membrane and high-molecular plastic film |
| CN108993174A (en) * | 2018-08-20 | 2018-12-14 | 宁波昌祺微滤膜科技有限公司 | A kind of ePTFE hydrophilic film of resistance to sodium hypochlorite and its preparation method and application |
| CN108993174B (en) * | 2018-08-20 | 2021-07-13 | 宁波昌祺微滤膜科技有限公司 | Sodium hypochlorite-resistant ePTFE hydrophilic membrane and preparation method and application thereof |
| CN110523301A (en) * | 2019-09-23 | 2019-12-03 | 重庆大学 | A kind of membrane distillation membrane material and preparation method thereof |
| CN110523301B (en) * | 2019-09-23 | 2022-03-22 | 重庆大学 | Membrane material for membrane distillation and preparation method thereof |
| CN112619451A (en) * | 2020-11-27 | 2021-04-09 | 宁波职业技术学院 | Preparation method of hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane |
| CN112619451B (en) * | 2020-11-27 | 2024-01-16 | 宁波职业技术学院 | Preparation method of hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane |
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