CN117160260A - PTFE (polytetrafluoroethylene) membrane with high washability and pollution resistance and preparation method thereof - Google Patents
PTFE (polytetrafluoroethylene) membrane with high washability and pollution resistance and preparation method thereof Download PDFInfo
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- CN117160260A CN117160260A CN202311331059.4A CN202311331059A CN117160260A CN 117160260 A CN117160260 A CN 117160260A CN 202311331059 A CN202311331059 A CN 202311331059A CN 117160260 A CN117160260 A CN 117160260A
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- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 56
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 56
- 239000012528 membrane Substances 0.000 title claims abstract description 52
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title abstract description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 24
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920001661 Chitosan Polymers 0.000 claims abstract description 24
- 239000002904 solvent Substances 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000011259 mixed solution Substances 0.000 claims description 22
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 19
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 12
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 12
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000008240 homogeneous mixture Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000003607 modifier Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000013557 residual solvent Substances 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000011109 contamination Methods 0.000 claims description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 2
- 230000004907 flux Effects 0.000 abstract description 11
- 239000002253 acid Substances 0.000 abstract description 8
- 239000003513 alkali Substances 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003361 porogen Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a PTFE (polytetrafluoroethylene) high-washable and pollution-resistant MBR (Membrane biological reactor) membrane and a preparation method thereof, wherein the PTFE high-washable and pollution-resistant MBR membrane is mainly prepared from the following raw materials in parts by weight: 10-25 parts of polytetrafluoroethylene, 5-15 parts of chitosan, 8-10 parts of acrylic acid, 6-8 parts of pore-forming agent and 35-60 parts of solvent. The MBR membrane has high water flux, can be repeatedly cleaned, and has good acid and alkali corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of filter membranes, and particularly relates to a PTFE (polytetrafluoroethylene) washable pollution-resistant MBR (Membrane biological reactor) membrane and a preparation method thereof.
Background
The rapid development of the membrane technology brings great influence to a plurality of fields, and is particularly applied to the aspect of sewage treatment technology, the MBR (membrane bioreactor) combines the biodegradation function of the traditional biological treatment technology and the high-efficiency separation function of the membrane separation technology, has the remarkable advantages of high pollutant removal efficiency, stable effluent quality, convenient operation and management, small occupied area and the like in sewage, and has very wide application prospect.
However, the MBR membrane is complicated to treat after pollution, has high cost, generally uses physical cleaning and chemical cleaning, and has a simple physical cleaning method but poor cleaning effect; the chemical cleaning needs to take out the membrane module for cleaning, the consumption time is long, the repeated cleaning is needed, and a better cleaning effect cannot be achieved. With the continuous improvement of the cleaning technology, the chemical cleaning is improved to a certain extent, and the online cleaning can be performed, but the operation can not be performed while the cleaning is performed in the cleaning process, so that the normal production operation can be influenced, and even the service life of equipment can be reduced.
In view of this, the present invention has been made.
Disclosure of Invention
The first object of the invention is to provide a PTFE membrane with high washing resistance and pollution resistance, which has high water flux, can be repeatedly washed, has good acid and alkali corrosion resistance and prolongs the service life.
The second aim of the invention is to provide the preparation method of the PTFE membrane with high washability and pollution resistance, which has the advantages of low requirements on equipment and reaction conditions, easily available raw materials, low cost, safe and environment-friendly preparation process and higher popularization and application values.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
the PTFE membrane is mainly prepared from the following raw materials in parts by weight: 10-25 parts of polytetrafluoroethylene, 5-15 parts of chitosan, 8-10 parts of acrylic acid, 6-8 parts of pore-forming agent and 35-60 parts of solvent.
Preferably, as a further specific embodiment, 13-25 parts of polytetrafluoroethylene, 8-15 parts of chitosan, 9-10 parts of acrylic acid, 7-8 parts of a pore-forming agent and 45-60 parts of a solvent.
Preferably, as a further specific embodiment, 25 parts of polytetrafluoroethylene, 15 parts of chitosan, 10 parts of acrylic acid, 8 parts of porogen and 60 parts of solvent.
Preferably, as a further specific embodiment, the pore-forming agent is one of polyethylene glycol and polyvinylpyrrolidone.
Preferably, as a further specific embodiment, the solvent is one of N, N-dimethylformamide and diethyl phthalate.
The invention selects polytetrafluoroethylene as the main material of the membrane, and the polytetrafluoroethylene is a high molecular polymer prepared by polymerizing monomers, has the characteristics of acid resistance, alkali resistance and various organic solvents resistance, is almost insoluble in all solvents, but is easy to generate plastic deformation under the action of continuous load for a long time. The chitosan is used as a modifier to endow polytetrafluoroethylene with excellent waterproof and moisture permeable functions, meanwhile, the compression resistance and the wear resistance of the film are obviously improved, and the defect of poor wear resistance of the pure polytetrafluoroethylene is overcome. Acrylic acid is used as a surfactant, acrylic acid is added into polytetrafluoroethylene, hydrophobic chains of the acrylic acid tend to be adsorbed on the surface of the polytetrafluoroethylene, hydrophilic head groups face to liquid, the original interaction relationship between solid molecules and liquid molecules is broken, and the permeability of the membrane is enhanced. Polyethylene glycol and polyvinylpyrrolidone have good solubility, biocompatibility, chemical stability, low toxicity and film forming property, when the polyvinylpyrrolidone is combined with polytetrafluoroethylene, the problems that a filter film made of polyvinylidene fluoride is easy to be polluted due to static charge, the water flux is small and the like in practical application can be solved, the solvent can be remarkably improved, N-dimethylformamide and diethyl phthalate are two good solvents, various organic matters can be stably dissolved, and the film forming stability is improved.
The invention also provides a preparation method of the PTFE material high-washing-resistance pollution-resistance MBR membrane, which comprises the following steps: the method comprises the following steps:
mixing the solvent and polytetrafluoroethylene, and stirring for 30min to be completely uniform at the rotating speed of 120r/min to obtain a mixed solution 1;
mixing chitosan and acrylic acid, stirring at a rotation speed of 120r/min for 30min until the mixture is completely uniform to obtain a mixed solution 2;
adding the pore-forming agent into the mixed solution 1, heating to 65+/-3 ℃, and stirring for 30min (120 r/min) until the pore-forming agent is uniformly mixed to obtain a mixed solution 3;
heating the mixed solution 3 to 80+/-3 ℃ and adopting ultrasonic mixing for 6-8 hours until a homogeneous mixture is formed, simultaneously stirring the mixed solution 2 for 2 hours, keeping the temperature at 60+/-3 ℃ for defoaming, standing and curing for 8-12 hours, and then uniformly mixing the homogeneous mixture and the cured mixed solution 2 to obtain a blending polymer casting solution;
scraping the casting film liquid into a layer of liquid film, immersing the film into a gel bath for curing to obtain an MBR film;
and soaking the MBR membrane in a hydrophilization modifier at 20-30 ℃ for 8-12 h, and rinsing with clear water to remove residual solvents and additives.
Preferably, as a further specific embodiment, the solvent, polytetrafluoroethylene, chitosan and propylene are mixed uniformly, and then mixed.
Preferably, as a further specific embodiment, in the step of mixing the homogeneous mixture with the cured mixed liquor 2, the mixing temperature is 20 ℃ to 25 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) The MBR membrane has high water flux after being added with raw materials such as chitosan and the like, can be repeatedly cleaned, and has good acid and alkali corrosion resistance.
(2) The invention has low requirements on equipment and reaction conditions, easily obtained raw materials, low cost, safe and environment-friendly preparation process and higher popularization and application values.
Detailed Description
The technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
10g of polytetrafluoroethylene, 5g of chitosan, 8g of acrylic acid, 6g of polyvinylpyrrolidone and 35g of N, N-dimethylformamide are weighed and dissolved.
The preparation method of the PTFE membrane with high washability and pollution resistance comprises the following steps:
adding the weighed N, N-dimethylformamide and polytetrafluoroethylene into a reaction kettle, uniformly mixing, stirring for 30min at the rotating speed of 120r/min until the mixture is completely uniform, and obtaining a mixed solution 1;
adding the weighed chitosan and acrylic acid into a reaction kettle, uniformly mixing, stirring for 30min at the rotating speed of 120r/min until the chitosan and the acrylic acid are completely uniform, and obtaining a mixed solution 2;
adding the weighed polyvinylpyrrolidone into the mixed solution 1, heating to 65+/-3 ℃, and stirring for 30min (120 r/min) until the polyvinylpyrrolidone is uniformly mixed to obtain a mixed solution 3;
heating the mixed solution 3 to 80+/-3 ℃ and adopting ultrasonic mixing for 6-8 hours until a homogeneous mixture is formed, simultaneously stirring the mixed solution 2 for 2 hours, keeping the temperature at 60+/-3 ℃ for defoaming, standing and curing for 8-12 hours, and then uniformly mixing the homogeneous mixture and the cured mixed solution 2 to obtain a blending polymer casting solution;
scraping the casting film liquid into a layer of liquid film, immersing the film into a gel bath for curing to obtain an MBR film;
and soaking the MBR membrane in a hydrophilization modifier at 20-30 ℃ for 8-12 h, and rinsing with clear water to remove residual solvents and additives, thus obtaining the PTFE membrane with high washing resistance and pollution resistance.
Example 2
The specific operation procedure was the same as in example 1, except that the mass of each component was changed to: 25g of polytetrafluoroethylene, 15g of chitosan, 10g of acrylic acid, 8g of polyvinylpyrrolidone and 60g of N, N-dimethylformamide are dissolved.
Example 3
The specific operation procedure was the same as in example 1, except that the mass of each component was changed to: 25g of polytetrafluoroethylene, 15g of chitosan, 10g of acrylic acid, 8g of polyvinylpyrrolidone and 35g of N, N-dimethylformamide are dissolved.
Example 4
The specific embodiment is the same as example 3 except that the porogen is replaced by an equivalent amount of polyethylene glycol.
Example 5
The embodiment is the same as in example 3 except that the solvent is replaced with an equal mass of dissolved diethyl phthalate.
Comparative example 1
The specific embodiment is the same as in example 3 except that the mass of chitosan is changed to 20g.
Comparative example 2
The specific embodiment is the same as in example 3 except that the mass of chitosan is changed to 3g.
Comparative example 3
The embodiment is the same as in example 4 except that the mass of polyvinylpyrrolidone is changed to 10g.
Comparative example 4
The embodiment is the same as in example 4 except that the mass of polyvinylpyrrolidone is changed to 5g.
Comparative example 5
The embodiment is the same as in example 3 except that the mass of polytetrafluoroethylene is changed to 30g.
Comparative example 6
The embodiment is the same as in example 3 except that the mass of polytetrafluoroethylene is changed to 7g.
Comparative example 7
The embodiment is the same as in example 3 except that the mass of acrylic acid is changed to 15g
Comparative example 8
The embodiment is the same as in example 3 except that the mass of acrylic acid is changed to 5g
Experimental example
The following tests were performed on the PTFE-based MBR membrane with high wash resistance and contamination resistance prepared in the above examples: soaking the prepared membrane in NaOH solution at 0.5mol/L and HCl solution at 0.5mol/L for 7 days, 15 days and 30 days respectively, testing flux before and after static bubbling of the membrane at 1.0MPa, measuring rejection rate R of inorganic salt, and observing change of the surface of the membrane;
TABLE 1 soaking data in NaOH solution at 0.5mol/L
TABLE 2 soaking data in 0.5mol/L HCl solution
From the above data, the following conclusions can be drawn:
the data of examples 1-5 show that the PTFE membrane with high washability and pollution resistance obtained by the method of the invention can achieve the purpose of the invention when the proportion of 10-25 parts of polytetrafluoroethylene, 5-15 parts of chitosan, 8-10 parts of acrylic acid, 6-8 parts of pore-forming agent and 35-60 parts of solvent is in the range, and meanwhile, according to the data, the PTFE membrane with high washability and pollution resistance prepared by the formula of the invention has higher flux, is more stable in an acidic and alkaline cleaning environment for a long time and has insignificant flux drop.
As is clear from the comparison examples and comparative examples 1 to 8, when the polytetrafluoroethylene is excessive, the characteristics of the polytetrafluoroethylene membrane itself after unmodified, such as the disadvantages of small water flux, easy pollution and breakage, etc., are directly exhibited, and when the polytetrafluoroethylene is too little, the membrane cannot be formed into a stable usable MBR membrane. When the chitosan is used as a modifier, the property of the membrane can be changed when the chitosan is excessively added, so that the filtration effect of the MBR membrane component is weakened, the acid and alkali resistance degree is reduced, and when the modifier is added less, the modification effect is reduced, and the acid and alkali corrosion resistant membrane cannot be formed. When the acrylic acid is used as a surfactant, the surface tension of the film is excessively and obviously reduced when the acrylic acid is excessively added, so that the film is easy to break, and the acid and alkali resistance is obviously reduced; however, if the amount of the surfactant added is too small, the film cannot be effectively modified, and the performance of the film itself is lowered. The acrylic acid and the polyvinylpyrrolidone are taken as pore-forming agents, so that the pore-forming agents with proper uniform size can be formed on the surface of the membrane, the problems of easy pollution of polytetrafluoroethylene, small water flux and other practical application can be solved, and the membrane cannot form stable and uniform pore diameters by excessively adding or excessively adding, so that the purpose of the invention cannot be achieved.
In summary, the purpose of the invention can be achieved when the proportion of 10-25 parts of polytetrafluoroethylene, 5-15 parts of chitosan, 8-10 parts of acrylic acid, 6-8 parts of pore-forming agent and 35-60 parts of solvent is in the range, the prepared membrane has higher water flux, the water flux is not obviously reduced after being soaked in strong acid and strong alkali for 30 days, the membrane has better acid-base corrosion resistance, and the membrane can be repeatedly cleaned, thereby prolonging the service life of the membrane.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The PTFE membrane is characterized by being prepared from the following raw materials in parts by weight: 10-25 parts of polytetrafluoroethylene, 5-15 parts of chitosan, 8-10 parts of acrylic acid, 6-8 parts of pore-forming agent and 35-60 parts of solvent.
2. The PTFE material high-washing-resistance pollution-resistance MBR membrane of claim 1, wherein 13-25 parts of polytetrafluoroethylene, 8-15 parts of chitosan, 9-10 parts of acrylic acid, 7-8 parts of pore-forming agent and 45-60 parts of solvent.
3. The high wash-resistant and pollution-resistant MBR membrane made of PTFE material as claimed in claim 1, wherein the PTFE is 25 parts, the chitosan is 15 parts, the acrylic acid is 10 parts, the pore-forming agent is 8 parts and the solvent is 60 parts.
4. The PTFE-based high wash-resistant fouling-resistant MBR membrane of claim 1, wherein the pore-forming agent is one of polyethylene glycol and polyvinylpyrrolidone.
5. The PTFE-based high wash-resistant fouling-resistant MBR membrane of claim 1, wherein the solvent is one of N, N-dimethylformamide and diethyl phthalate.
6. A method for preparing a PTFE membrane with high wash resistance and pollution resistance according to any one of claims 1 to 5, comprising the following steps:
mixing the solvent and polytetrafluoroethylene, and stirring for 30min to be completely uniform at the rotating speed of 120r/min to obtain a mixed solution 1;
mixing chitosan and acrylic acid, stirring at a rotation speed of 120r/min for 30min until the mixture is completely uniform to obtain a mixed solution 2;
adding the pore-forming agent into the mixed solution 1, heating to 65+/-3 ℃, and stirring for 30min (120 r/min) until the pore-forming agent is uniformly mixed to obtain a mixed solution 3;
heating the mixed solution 3 to 80+/-3 ℃ and adopting ultrasonic mixing for 6-8 hours until a homogeneous mixture is formed, simultaneously stirring the mixed solution 2 for 2 hours, keeping the temperature at 60+/-3 ℃ for defoaming, standing and curing for 8-12 hours, and then uniformly mixing the homogeneous mixture and the cured mixed solution 2 to obtain a blending polymer casting solution;
scraping the casting film liquid into a layer of liquid film, immersing the film into a gel bath for curing to obtain an MBR film;
and soaking the MBR membrane in a hydrophilization modifier at 20-30 ℃ for 8-12 h, and rinsing with clear water to remove residual solvents and additives.
7. The method for preparing a PTFE membrane with high washing resistance and pollution resistance according to claim 6, wherein the solvent, polytetrafluoroethylene, chitosan and propylene are required to be mixed uniformly and then mixed.
8. The method for preparing a high wash-resistant and contamination-resistant MBR membrane made of PTFE material as claimed in claim 6, wherein in the step of mixing the homogeneous mixture with the cured mixed solution 2, the mixing temperature is 20-25 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311331059.4A CN117160260A (en) | 2023-10-16 | 2023-10-16 | PTFE (polytetrafluoroethylene) membrane with high washability and pollution resistance and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311331059.4A CN117160260A (en) | 2023-10-16 | 2023-10-16 | PTFE (polytetrafluoroethylene) membrane with high washability and pollution resistance and preparation method thereof |
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| CN117160260A true CN117160260A (en) | 2023-12-05 |
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