CN112619451A - Preparation method of hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane - Google Patents
Preparation method of hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane Download PDFInfo
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- CN112619451A CN112619451A CN202011360252.7A CN202011360252A CN112619451A CN 112619451 A CN112619451 A CN 112619451A CN 202011360252 A CN202011360252 A CN 202011360252A CN 112619451 A CN112619451 A CN 112619451A
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 84
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 84
- 239000012528 membrane Substances 0.000 title claims abstract description 71
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 42
- 238000001471 micro-filtration Methods 0.000 title claims abstract description 24
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000005245 sintering Methods 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000000243 solution Substances 0.000 claims description 23
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 16
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- CNPVJWYWYZMPDS-UHFFFAOYSA-N 2-methyldecane Chemical compound CCCCCCCCC(C)C CNPVJWYWYZMPDS-UHFFFAOYSA-N 0.000 claims description 8
- BHTJEPVNHUUIPV-UHFFFAOYSA-N pentanedial;hydrate Chemical compound O.O=CCCCC=O BHTJEPVNHUUIPV-UHFFFAOYSA-N 0.000 claims description 8
- 239000006184 cosolvent Substances 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 239000003350 kerosene Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000010687 lubricating oil Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 abstract description 15
- 238000012986 modification Methods 0.000 abstract description 15
- 238000002791 soaking Methods 0.000 abstract description 5
- 230000002045 lasting effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 229920002521 macromolecule Polymers 0.000 abstract description 2
- 238000004804 winding Methods 0.000 abstract description 2
- 230000004907 flux Effects 0.000 description 11
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 8
- 238000005303 weighing Methods 0.000 description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 7
- 239000010931 gold Substances 0.000 description 7
- 229910052737 gold Inorganic materials 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 230000008595 infiltration Effects 0.000 description 6
- 238000001764 infiltration Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 2
- 238000002715 modification method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
- B01D71/82—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 characterised by the presence of specified groups, e.g. introduced by chemical after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Artificial Filaments (AREA)
Abstract
The invention belongs to the technical field of material surface modification, and particularly relates to a preparation method of a hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane. The invention adopts PVA to carry out hydrophilic modification on the PTFE micro-filtration membrane, PVA macromolecules can penetrate into nodes of the PTFE micro-filtration membrane and are tightly combined with PTFE through physical winding action, thereby forming a compact hydrophilic modification layer on the surface of the membrane, improving the hydrophilicity of the membrane, and then soaking and drying in glutaraldehyde to ensure that PVA molecules are fully crosslinked on the surface of the PTFE hollow tube, thereby improving the hydrophilic stability of the PTFE hollow tube and achieving the aim of lasting hydrophilicity.
Description
Technical Field
The invention belongs to the technical field of material surface modification, and particularly relates to a preparation method of a hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane.
Background
The Polytetrafluoroethylene (PTFE) microfiltration membrane has wide application in the fields of chemical industry, medicine, wastewater treatment and the like due to excellent physical and chemical properties. At present, PTFE hollow fiber microfiltration membranes are mostly manufactured by procedures of prepressing, stretching, high-temperature sintering and the like, and in the preparation process, the separation performance of the membranes can be influenced by compression ratio, stretching ratio, sintering temperature, sintering time and the like, and the control of the parameters in a proper range is particularly important. Meanwhile, due to the strong hydrophobicity of PTFE, the application of PTFE in the field of liquid separation is limited, and the surface of PTFE must be subjected to hydrophilic modification.
The hydrophilic modification method for the surface of the PTEF microfiltration membrane in the prior art mainly comprises chemical and physical modification, high-energy radiation grafting modification, plasma treatment modification, high-temperature melting, filling modification and the like, and the method has the main defects that the surface of the membrane after surface modification is poor in hydrophilicity and not stable enough. Therefore, it is urgently needed to develop a novel hydrophilic modification method for preparing a high-performance PTFE hollow fiber microfiltration membrane.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a preparation method of a hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane, and the microfiltration membrane prepared by the preparation method has high porosity, pure water flux and lasting hydrophilicity.
The above object of the present invention can be achieved by the following technical solutions: a preparation method of a hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane comprises the following steps:
s1, mixing the polytetrafluoroethylene resin and the cosolvent, and uniformly stirring to obtain a mixture;
s2, prepressing the mixture obtained in the step S1 into a cylinder shape, and extruding the cylinder shape into a solid hollow PTFE tube;
s3, preparing the solid hollow tube obtained in the step S2 into a porous PTFE hollow tube through stretching and sintering;
s4, dipping the porous PTFE hollow tube obtained in the step S3 in hydrophilic polyvinyl alcohol (PVA) water solution, drying, then dipping in glutaraldehyde water solution, and drying to obtain the durable hydrophilic PTFE hollow fiber micro-filtration membrane.
The invention adopts PVA to carry out hydrophilic modification on the PTFE micro-filtration membrane, PVA macromolecules can penetrate into nodes of the PTFE micro-filtration membrane and are tightly combined with PTFE through physical winding action, thereby forming a compact hydrophilic modification layer on the surface of the membrane, improving the hydrophilicity of the membrane, and then soaking and drying in glutaraldehyde to ensure that PVA molecules are fully crosslinked on the surface of the PTFE hollow tube, thereby improving the hydrophilic stability of the PTFE hollow tube and achieving the aim of lasting hydrophilicity.
Preferably, the cosolvent in the step S1 is at least one of kerosene or lubricating oil (Isopar G).
Preferably, in the step S1, the mass fraction of the polytetrafluoroethylene resin is 60-85%, and the mass fraction of the cosolvent is 15-40%.
Preferably, the compression ratio during extrusion in the step S2 is 450-580.
Preferably, the sintering temperature of the stretch sintering in the step S3 is 220-290 ℃, the sintering time is 1-5min, the stretch ratio is 2.2-2.8, the stretch temperature is 60-80 ℃, and the stretch rate is 3-6 m/min. The film prepared under the condition has higher porosity.
Preferably, the PVA concentration in the step S4 is 1-1.5%, the dipping time is 1.5-3h, and the temperature is 55-65 ℃.
Preferably, in the step S4, the concentration of glutaraldehyde in the glutaraldehyde aqueous solution is 1-5%, the pH value of the glutaraldehyde aqueous solution is 1-2, the immersion time is 1.5-3h, and the temperature is 55-65 ℃. At a certain acidity glutaraldehyde can only exert a cross-linking effect.
Preferably, the pore diameter of the PTFE hollow fiber micro-filtration membrane prepared in the step S4 is 0.1-0.4 μm, and the porosity is 40-50%.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts the stretching sintering of a specific process to prepare the PTFE hollow fiber micro-filtration membrane, and obtains permanent hydrophilicity after PVA hydrophilic modification and glutaraldehyde further crosslinking. The membrane prepared by the process has the characteristics of high porosity, high pure water flux and lasting hydrophilicity.
Detailed Description
The following are specific examples of the present invention and illustrate the technical solutions of the present invention for further description, but the present invention is not limited to these examples. The raw materials used in the examples of the present invention are those commonly used in the art, and the methods used in the examples are those conventional in the art, unless otherwise specified.
Example 1
Weighing 60% of PTFE resin (raw material from Japan gold) and 40% of kerosene according to the mass percentage, mixing and melting, prepressing the uniformly mixed and melted sample, putting the sample into an extruder, setting the compression ratio to be 450, and extruding a hollow tube; stretching and sintering the hollow tube, wherein the stretching ratio is set to be 2.2, the stretching temperature is 60 ℃, the sintering temperature is 220 ℃, the sintering time is 1min, and the stretching speed is 3m/min, so that the PTFE hollow fiber membrane with the aperture of 0.1-0.4 mu m and the porosity of 40% is obtained;
putting the prepared PTFE hollow fiber membrane into industrial alcohol for full infiltration, taking out the PTFE hollow fiber membrane, putting the PTFE hollow fiber membrane into 1% PVA water solution, soaking the PTFE hollow fiber membrane for 1.5h at 55 ℃, then putting the PTFE hollow fiber membrane into 1% glutaraldehyde water solution with the concentration of 1%, adjusting the pH value of the PTFE hollow fiber membrane to be 2, soaking the PTFE hollow fiber membrane for 1.5h at 50 ℃, and then putting the PTFE hollow fiber membrane into clear water for soaking and washing; finally, the membrane is dried at low temperature of 30 ℃ for standby. The pure water flux of the modified PTFE membrane measured at 0.1MPa was 4560L/m2h。
Example 2
Weighing 70% of PTFE resin (raw material from Japan gold) and 30% of Isopar G according to the mass percentage, mixing and melting, prepressing the uniformly mixed and melted sample, putting the sample into an extruder, setting the compression ratio to 468, and extruding a hollow tube; stretching and sintering the hollow tube, wherein the stretching ratio is set to be 2.3, the stretching temperature is 65 ℃, the sintering temperature is 280 ℃, the sintering time is 2min, and the stretching speed is 3.5m/min, so that the PTFE hollow fiber membrane with the aperture of 0.1-0.4 mu m and the porosity of 42% is obtained;
the prepared PTFE hollow fiber membrane is put into industrial alcohol for full infiltration, taken out and put into 1.2 percent PVA water solution to be soaked for 2 hours at 60 ℃, then put into 2 percent glutaraldehyde water solution, the pH value of the solution is adjusted to be 1, the solution is soaked for 2 hours at 60 ℃, then the solution is put into clear water to be soaked and washed, and finally the membrane is dried at the low temperature of 35 ℃ for standby. The pure water flux of the modified PTFE membrane measured at 0.1MPa was 5760L/m2h。
Example 3
Weighing 80% of PTFE resin (raw material from Japan gold) and 20% of Isopar G according to the mass percentage, mixing and melting, prepressing the uniformly mixed and melted sample, putting the sample into an extruder, setting the compression ratio to be 500, and extruding a hollow tube; stretching and sintering the hollow tube, wherein the stretching ratio is set to be 2.5, the stretching temperature is 80 ℃, the sintering temperature is 270 ℃, the sintering time is 3min, and the stretching speed is 4m/min, so that the PTFE hollow fiber membrane with the aperture of 0.1-0.4 mu m and the porosity of 50% is obtained;
the prepared PTFE hollow fiber membrane is put into industrial alcohol for full infiltration, taken out and put into 1.5 percent PVA water solution to be soaked for 2 hours at 60 ℃, then put into 5 percent glutaraldehyde water solution to be soaked for 1.5 hours at 60 ℃, then put into clear water to be soaked and washed, and finally the membrane is dried at 40 ℃ for standby. The pure water flux of the modified PTFE membrane measured at 0.1MPa was 6420L/m2h。
Example 4
Weighing 65% of PTFE resin (raw material from Japan gold) and 35% of kerosene according to the mass percent, mixing and melting, prepressing the uniformly mixed and melted sample, putting the sample into an extruder, setting the compression ratio to be 520, and extruding a hollow tube; stretching and sintering the hollow tube, wherein the stretching ratio is set to be 2.6, the stretching temperature is 80 ℃, the sintering temperature is 280 ℃, the sintering time is 4min, and the stretching speed is 1m/min, so that the PTFE hollow fiber membrane with the aperture of 0.1-0.4 mu m and the porosity of 45% is obtained;
the prepared PTFE hollow fiber membrane is put into industrial alcohol for full infiltration, taken out and put into 1% PVA water solution to be soaked for 1.5h at 60 ℃, then put into 3% glutaraldehyde water solution to be soaked for 1.5h at 60 ℃, then put into clear water to be soaked and washed, and finally the membrane is dried at low temperature of 30 ℃ for standby. The pure water flux of the modified PTFE membrane measured at 0.1MPa was 5460L/m2h。
Example 5
Weighing 80% of PTFE resin (raw material from Japan gold) and 20% of Isopar G according to the mass percentage, mixing and melting, prepressing the uniformly mixed and melted sample, putting the sample into an extruder, setting the compression ratio to be 580, and extruding a hollow tube; stretching and sintering the hollow tube, wherein the stretching ratio is set to be 2.8, the stretching temperature is 70 ℃, the sintering temperature is 290 ℃, the sintering time is 5min, and the stretching speed is 6m/min, so that the PTFE hollow fiber membrane with the aperture of 0.1-0.4 mu m and the porosity of 43% is obtained;
the prepared PTFE hollow fiber membrane is put into industrial alcohol for full infiltration, taken out and put into 1% PVA water solution to be soaked for 3h at 60 ℃, then put into 1% glutaraldehyde water solution, the pH value of the PTFE hollow fiber membrane is adjusted to be 2, the PTFE hollow fiber membrane is soaked for 3h at 60 ℃, then the PTFE hollow fiber membrane is put into clear water to be soaked and washed, and finally the PTFE hollow fiber membrane is dried at low temperature of 40 ℃ for standby. The pure water flux of the modified PTFE membrane was 5720L/m as measured at 0.1MPa2h。
Comparative example 1
Weighing 90% of PTFE resin (raw material from Japan gold) and 10% of Isopar G by mass percent, mixing and melting, prepressing the uniformly mixed and melted sample, putting the sample into an extruder, setting the compression ratio to be 361, and extruding a hollow tube. And (3) stretching and sintering the hollow tube, wherein the stretching ratio is set to be 3.2, the stretching temperature is 30 ℃, the sintering temperature is 320 ℃, and the stretching speed is 1m/min, so that the PTFE hollow fiber membrane with a certain aperture and porosity is obtained. The obtained PTFE film was measured to have a porosity of 30% and a pure water flux of 0.
The prepared PTFE hollow fiber membrane is put into industrial alcohol for full infiltration, taken out and put into 1.5 percent PVA water solution to be soaked for 2 hours at 60 ℃, then put into 5 percent glutaraldehyde water solution to be soaked for 1.5 hours at 60 ℃, then put into clear water to be soaked and washed, and finally the membrane is dried at 40 ℃ for standby. The pure water flux of the modified PTFE membrane measured at 0.1MPa was 1230L/m2h, much lower than the membrane flux prepared by the invention.
Comparative example 2
Weighing 80% of PTFE resin (raw material from Japan gold) and 20% of Isopar G according to the mass percentage, mixing and melting, prepressing the uniformly mixed and melted sample, putting the sample into an extruder, setting the compression ratio to be 500, and extruding a hollow tube; stretching and sintering the hollow tube, wherein the stretching ratio is set to be 2.5, the stretching temperature is 80 ℃, the sintering temperature is 270 ℃, and the stretching speed is 4m/min, so that the PTFE hollow fiber membrane with the aperture of 0.1-0.4 mu m and the porosity of 50% is obtained;
without hydrophilic modification, PTFE cannot be filtered at all, and water cannot pass through the pores of the membrane surface.
Comparative example 3
Weighing PTFE resin, adding SiO accounting for 1% of the total amount of the materials2Mixing the nano particles with resin, and adding SiO2Respectively mixing and melting PTFE resin of nano particles and Isopar G according to the mass percent of 80% and 20%, prepressing the uniformly mixed and melted sample, putting the sample into an extruder, setting the compression ratio to be 500, and extruding a hollow tube; stretching and sintering the hollow tube, wherein the stretching ratio is set to be 2.5, the stretching temperature is 80 ℃, the sintering temperature is 270 ℃, the sintering time is 3min, the stretching speed is 4m/min, and finally the PTFE hollow fiber membrane with the aperture of 0.3-0.7 and the porosity of 35 percent is obtained, and the SiO is added into the hollow fiber microfiltration membrane2The nanoparticles themselves had an improved hydrophilicity, but the pure water flux of the PTFE membrane measured at 0.1MPa was only 1240L/m2h, far lower than the hydrophilic modified membrane prepared by the invention.
The technical scope of the invention claimed by the embodiments herein is not exhaustive and new solutions formed by equivalent replacement of single or multiple technical features in the embodiments are also within the scope of the invention, and all parameters involved in the solutions of the invention do not have mutually exclusive combinations if not specifically stated.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (8)
1. A preparation method of a hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane is characterized by comprising the following steps:
s1, mixing the polytetrafluoroethylene resin and the cosolvent, and uniformly stirring to obtain a mixture;
s2, prepressing the mixture obtained in the step S1 into a cylinder shape, and extruding the cylinder shape into a solid hollow PTFE tube;
s3, preparing the solid hollow tube obtained in the step S2 into a porous PTFE hollow tube through stretching and sintering;
s4, dipping the porous PTFE hollow tube obtained in the step S3 in hydrophilic polyvinyl alcohol (PVA) water solution, drying, then dipping in glutaraldehyde water solution, and drying to obtain the durable hydrophilic PTFE hollow fiber micro-filtration membrane.
2. The method for preparing a hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane according to claim 1 wherein the cosolvent in step S1 is at least one of kerosene or lubricating oil (Isopar G).
3. The method for preparing a hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane according to claim 1, wherein in step S1, the mass fraction of the polytetrafluoroethylene resin is 60-85% and the mass fraction of the cosolvent is 15-40%.
4. The method as claimed in claim 1, wherein the extrusion compression ratio is 450-580 in the step S2.
5. The method as claimed in claim 1, wherein the sintering temperature for the stretch sintering in step S3 is 220-290 ℃, the sintering time is 1-5min, the stretch ratio is 2.2-2.8, the stretching temperature is 60-80 ℃, and the stretching speed is 3-6 m/min.
6. The method of claim 1, wherein the PVA concentration in step S4 is 1-1.5%, the immersion time is 1.5-3h, and the temperature is 55-65 ℃.
7. The method as claimed in claim 1, wherein the concentration of glutaraldehyde in the glutaraldehyde aqueous solution in step S4 is 1-5%, the pH of the glutaraldehyde aqueous solution is 1-2, the immersion time is 1.5-3h, and the temperature is 50-60 ℃.
8. The method as claimed in claim 1, wherein the PTFE hollow fiber microfiltration membrane prepared in step S4 has a pore size of 0.1 to 0.4 μm and a porosity of 40 to 50%.
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| CN202011360252.7A CN112619451B (en) | 2020-11-27 | 2020-11-27 | Preparation method of hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane |
| AU2021104813A AU2021104813A4 (en) | 2020-11-27 | 2021-08-02 | Method for preparing hydrophilic polytetrafluoroethylene hollow fiber microfiltration membrane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113230904A (en) * | 2021-04-28 | 2021-08-10 | 利得膜(北京)新材料技术有限公司 | Continuous modification equipment and hydrophilic modification method for e-PTFE hollow fiber membrane yarn |
| CN114832637A (en) * | 2022-05-11 | 2022-08-02 | 沈阳工业大学 | In-situ synthesis method for regulating and controlling pores and properties of carbon membrane surface interface |
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| CN103191654A (en) * | 2013-04-27 | 2013-07-10 | 中材科技股份有限公司 | Lasting hydrophilic modification method of polytetrafluoroethylene microporous membrane |
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| CN114832637A (en) * | 2022-05-11 | 2022-08-02 | 沈阳工业大学 | In-situ synthesis method for regulating and controlling pores and properties of carbon membrane surface interface |
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| AU2021104813A4 (en) | 2021-09-30 |
| CN112619451B (en) | 2024-01-16 |
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