CN115414801B - Method for preparing durable hydrophilic polytetrafluoroethylene separation membrane by one-step method - Google Patents
Method for preparing durable hydrophilic polytetrafluoroethylene separation membrane by one-step method Download PDFInfo
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- CN115414801B CN115414801B CN202211062509.XA CN202211062509A CN115414801B CN 115414801 B CN115414801 B CN 115414801B CN 202211062509 A CN202211062509 A CN 202211062509A CN 115414801 B CN115414801 B CN 115414801B
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- 239000012528 membrane Substances 0.000 title claims abstract description 89
- 238000000926 separation method Methods 0.000 title claims abstract description 79
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 76
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 74
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000011259 mixed solution Substances 0.000 claims abstract description 32
- 238000002791 soaking Methods 0.000 claims abstract description 22
- 239000010954 inorganic particle Substances 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 17
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 229920005597 polymer membrane Polymers 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- NSDIFWPNVNLOLG-UHFFFAOYSA-N trifluoro(1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluorooctyl)silane Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)[Si](F)(F)F NSDIFWPNVNLOLG-UHFFFAOYSA-N 0.000 claims description 6
- 239000012510 hollow fiber Substances 0.000 claims description 5
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 4
- 229920000053 polysorbate 80 Polymers 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 230000004907 flux Effects 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 229920002125 Sokalan® Polymers 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000004584 polyacrylic acid Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009941 weaving 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
- B01D71/30—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
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
-
- 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
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
- B01D71/024—Oxides
-
- 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
Abstract
The invention provides a preparation method of a hydrophilic polytetrafluoroethylene separation membrane, which belongs to the technical field of membranes and comprises the following steps: (1) preparing an organic molecular solution in a reactor; (2) Adding inorganic particles into the organic molecule solution to form a mixed solution; (3) Soaking a polytetrafluoroethylene separation membrane in the mixed solution, and uniformly distributing the mixed solution on the surface of the polymer membrane and the pore canal of the polymer membrane by adopting ultrasonic, vibration or stirring modes; (4) Taking out the soaked polytetrafluoroethylene separation membrane from the mixed solution, and drying the polytetrafluoroethylene separation membrane; (5) And (3) sintering the dried polytetrafluoroethylene separation membrane at a high temperature. The method can be applied to preparing the durable hydrophilic polytetrafluoroethylene separation membrane, the water contact angle of the separation membrane prepared by the method can be reduced to 0 ℃ in 10 seconds, the flux of the separation membrane can be increased to 5-40 times of that of the original membrane, and the porosity is increased by not more than 10%. And the reaction conditions are simple and easy to control, are easy to amplify, are suitable for large-scale production, and have good application prospects.
Description
Technical Field
The invention relates to the technical field of hydrophilization modification of polytetrafluoroethylene separation membranes, in particular to a method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane by a one-step method.
Background
The membrane separation technology has the advantages of low energy consumption, convenient operation and the like, and is widely applied to chemical industry, medicine, environment and the like in which material separation is required. The polytetrafluoroethylene separation membrane has been spotlighted because of its extremely stable chemical properties, corrosion resistance, tensile strength and the like, and has been widely applied to the field of sewage treatment in extreme working condition environments such as landfill leachate, quilting, weaving, electroplating and the like. But the surface presents extremely strong hydrophobicity due to extremely small specific surface energy, so that the separation power consumption in the using process is increased and a certain application scene is limited.
Therefore, the preparation of the polytetrafluoroethylene separation membrane which has high strength, high chemical resistance and hydrophilicity has important practical significance, and the current preparation of the hydrophilic separation membrane mainly comprises the steps of using hydrophilic organic polymers in the early stage, blending hydrophilic oxide particles with polytetrafluoroethylene resin, stretching, sintering, coating with a later surfactant and the like. In the two methods, the former process is too long and cannot greatly reduce the surface water contact angle due to the influence of the doping amount; the latter has the disadvantage that the coated surfactant is easily detached. In view of the above problems, a solution is proposed below.
Disclosure of Invention
The invention aims to provide a method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane by a one-step method, which has the advantages of shorter process flow and durable hydrophilic polytetrafluoroethylene separation membrane process, so as to meet the requirements of the current separation field and the expansion of applicability, thereby saving the separation power consumption and creating greater social benefits.
The invention provides a method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane by a one-step method. The method mainly utilizes the good chemical resistance and hydrophilicity of inorganic particles and the difference of molecular acting force among organic molecules, inorganic particles and polytetrafluoroethylene separation membranes, so that the organic molecules and inorganic particles in organic-inorganic mixed solution are deposited on the surface of the polytetrafluoroethylene separation membranes and inside the pore channels in an order of 'before and after', and meanwhile, the combination between the organic molecules and the inorganic particles is more stable through heat treatment at a certain temperature in the reaction process. The polytetrafluoroethylene separation membrane prepared by the method has excellent hydrophilic performance, and the water permeability flux can be improved by 5-40 times. The method is simple in preparation and easy to amplify, and has great popularization value
The technical aim of the invention is realized by the following technical scheme:
a method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane by a one-step method, comprising the following steps:
step (1): preparing organic molecule solution in a reactor by using solvent and organic molecules,
step (2): adding inorganic particles into the organic molecule solution to form a mixed solution, and uniformly stirring the mixed solution;
step (3): soaking a polytetrafluoroethylene separation membrane in the mixed solution, uniformly distributing the mixed solution on the surface of the polymer membrane and in the pore canal of the polymer membrane in an ultrasonic, oscillating or stirring mode, wherein the soaking temperature is 0-99 ℃ and the soaking time is 0-48 hours;
step (4): taking out the soaked polytetrafluoroethylene separating membrane from the mixed solution, drying the polytetrafluoroethylene separating membrane at the drying temperature of 30-100 ℃,
step (5): and (3) sintering the dried polytetrafluoroethylene separation membrane at a high temperature of 200-310 ℃ to obtain the durable hydrophilic polytetrafluoroethylene separation membrane.
The solvent in the step (1) is acetone, diethyl ether, tetrahydrofuran, ethanol or a mixture of a plurality of solvents;
the organic molecules in the step (1) are perfluoro octyl silane coupling agent, perfluoro polyacrylic acid, tween 80, sodium carboxymethyl cellulose or a mixture of the perfluoro octyl silane coupling agent, the perfluoro polyacrylic acid, tween 80 and sodium carboxymethyl cellulose, and the mass percentage concentration of the organic molecules in the organic molecule solution is 0.001-10%. Preferably 0.1-8%, more preferably 1-5%, most preferably 2-4%;
the inorganic particles in the step (2) are alumina particles, titanium dioxide particles and silicon dioxide particles, and the particle size of the particles is 1-50 nanometers; the mass percentage concentration of the inorganic particles in the mixed solution is 0.05-10%, preferably 0.1-8%, more preferably 0.5-2%;
the polytetrafluoroethylene separation membrane in the step (3) is a polytetrafluoroethylene flat membrane or a polytetrafluoroethylene hollow fiber membrane, and the pore diameter of the membrane is 0.1um-2um. The soaking temperature is 0-99 ℃ and the soaking time is 0-48 hours; preferably 20-70 deg.c, and soaking time is 10-30 hr.
The method for preparing the durable hydrophilic polytetrafluoroethylene separation membrane by the one-step method is characterized in that the drying temperature in the step (4) is 30-100 ℃; preferably 30-60 ℃ and the drying time is 5-60 minutes.
The method for preparing the durable hydrophilic polytetrafluoroethylene separation membrane by the one-step method is characterized in that the sintering temperature in the step (5) is 200-310 ℃, preferably 200-270 ℃ and the sintering time is 0.5-30 minutes
The beneficial effects of the invention are as follows: in the invention, the concentration of organic molecules and inorganic particles in the organic-inorganic mixed solution, the soaking temperature, the soaking time and the drying temperature have direct influence on the final performance of the polytetrafluoroethylene separation membrane. The invention mainly uses the difference of adsorption energy among organic molecules, inorganic suspension and polytetrafluoroethylene separation membranes, so that the structure of the prepared hydrophilic separation membrane is subject to the adsorption sequence of separation membrane fibers, organic molecules and inorganic particles, and meanwhile, the organic molecules also carry active sites capable of depositing inorganic particles, and the interaction force between the organic molecules and the inorganic particles is enhanced. Therefore, the concentration, soaking temperature and soaking time of the organic molecules and inorganic particles directly influence the statistical distribution relation of the components on the surface of the membrane, and the statistical distribution influences the hydrophilicity of the prepared separation membrane. The drying temperature directly influences the acting force mode and firmness between the organic molecules and the inorganic particles, and meanwhile, the inorganic particles also determine the hydrophilicity and firmness of the prepared separation membrane.
The method for preparing the durable hydrophilic polytetrafluoroethylene separation membrane by the one-step method is used for the polytetrafluoroethylene separation membrane. The hydrophilic angle of the separation membrane prepared by the method can be reduced to 0 degree within 10 seconds, the water flux is improved by 5-40 times, and the method is simple in process, easy to amplify and has great popularization value.
Drawings
FIG. 1 is a schematic illustration of the preparation of a flat sheet membrane according to the present invention;
FIG. 2 is a schematic diagram showing the adsorption sequence of the fiber-organic molecule-inorganic particle of the fiber separation membrane of the present invention;
FIG. 3 is a comparison of the front and back flux of an example of the present invention for preparing a hydrophilic polytetrafluoroethylene separation membrane;
FIG. 4 is a comparison of water contact angles before and after the preparation of hydrophilic polytetrafluoroethylene separation membranes in accordance with examples of the present invention.
Detailed Description
The present invention will now be described in detail and fully with reference to the following specific embodiments, it being apparent that the embodiments described are only some, but not all, of the embodiments of the invention. Given the examples of the present invention, all other embodiments that a person of ordinary skill in the art could achieve without the inventive effort are within the scope of the present invention.
Example 1
(1) Preparing a mixed solution of 2% of perfluorinated polyacrylic acid, 48% of acetone and 48% of water in percentage by mass;
(2) Dropwise adding 2% titanium dioxide suspended particles into the mixed solution, and uniformly stirring;
(3) Soaking the polytetrafluoroethylene separation membrane in the mixed solution in the step (2) for 24 hours at 30 ℃;
(4) Taking out the polytetrafluoroethylene separation membrane, and drying for 10 minutes at 60 ℃;
(5) And sintering the dried polytetrafluoroethylene separation membrane at 250 ℃ for 3 minutes. Thus obtaining the hydrophilic polytetrafluoroethylene separation membrane.
Example 2
(1) Preparing a mixed solution of 1% of perfluorooctyl silane coupling agent, 1% of perfluoropolyacrylic acid, 49% of ethanol and 49% of water in percentage by mass;
(2) Dropwise adding 2% silicon dioxide suspended particles into the mixed solution, and uniformly stirring;
(3) Soaking the polytetrafluoroethylene separation membrane in the mixed solution in the step (2) for 24 hours at 30 ℃;
(4) Taking out the polytetrafluoroethylene separation membrane, and drying for 3 minutes at 60 ℃;
(5) And sintering the dried polytetrafluoroethylene separation membrane at 250 ℃ for 5 minutes. Thus obtaining the hydrophilic polytetrafluoroethylene separation membrane.
Example 3
(1) Preparing a mixed solution of 1% of perfluorooctyl silane coupling agent, 1% of Tween 80, 60% of acetone and 38% of water in percentage by mass;
(2) Dropwise adding 2% titanium dioxide suspended particles into the mixed solution, and uniformly stirring;
(3) Soaking the polytetrafluoroethylene separation membrane in the mixed solution in the step (2) for 24 hours at 30 ℃;
(4) Taking out the polytetrafluoroethylene separation membrane, and drying for 10 minutes at 40 ℃;
(5) And sintering the dried polytetrafluoroethylene separation membrane at 270 ℃ for 1.5 minutes. Thus obtaining the hydrophilic polytetrafluoroethylene separation membrane.
Example 4
(1) Preparing a mixed solution of 1% of perfluorooctyl silane coupling agent, 1% of sodium carboxymethyl cellulose, 48% of ethanol and 48% of water in percentage by mass;
(2) Dropwise adding 2% titanium dioxide suspended particles into the mixed solution, and uniformly stirring;
(3) Soaking the polytetrafluoroethylene separation membrane in the mixed solution in the step (2) for 24 hours at 30 ℃;
(4) Taking out the polytetrafluoroethylene separation membrane, and drying for 5 minutes at 60 ℃;
(5) And sintering the dried polytetrafluoroethylene separation membrane at 250 ℃ for 3 minutes. Thus obtaining the hydrophilic polytetrafluoroethylene separation membrane.
The following film performance tests were performed on the above examples, and the test results showed that:
the hydrophilic polytetrafluoroethylene separation membranes prepared in examples 1-4 have excellent hydrophilic performance, and the water flux can be improved by 5-40 times. Taking polytetrafluoroethylene hollow fiber membranes as an example, water flux data and contact angle data before and after modification are shown in fig. 3 and 4, respectively. In FIG. 3, the water flux of the polytetrafluoroethylene hollow fiber membrane before modification is 135L/(m) 2 hbar), modificationThe post-water flux is 3750L/(m) 2 hbar) is 27.8 times before modification, the water contact angle of the polytetrafluoroethylene hollow fiber separation membrane before modification is about 120 degrees, and the water contact angle can reach 0 degrees within 8 seconds after modification, which shows that the modification effect is obvious.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane by a one-step method, which is characterized by comprising the following steps:
step (1): preparing organic molecule solution in a reactor by using solvent and organic molecules,
step (2): adding inorganic particles into the organic molecule solution to form a mixed solution, and uniformly stirring the mixed solution;
step (3): soaking a polytetrafluoroethylene separation membrane in the mixed solution, uniformly distributing the mixed solution on the surface of the polymer membrane and in the pore canal of the polymer membrane in an ultrasonic, oscillating or stirring mode, wherein the soaking temperature is 0-99 ℃ and the soaking time is 0-48 hours;
step (4): taking out the soaked polytetrafluoroethylene separation membrane from the mixed solution, and drying the polytetrafluoroethylene separation membrane at the drying temperature of 30-100 ℃;
step (5): sintering the dried polytetrafluoroethylene separation membrane at a high temperature of 200-310 ℃ to obtain a durable hydrophilic polytetrafluoroethylene separation membrane;
the solvent in the step (1) is acetone, diethyl ether, tetrahydrofuran, ethanol or a mixture of a plurality of solvents;
the organic molecules in the step (1) are perfluorooctyl silane coupling agent, perfluoropolyacrylic acid, tween 80, sodium carboxymethyl cellulose or a mixture of the above, and the mass percentage concentration of the organic molecules in the organic molecule solution is 0.001-10%;
the inorganic particles in the step (2) are alumina particles, titanium dioxide particles and silicon dioxide particles, and the particle size of the particles is 1-50 nanometers; the mass percentage concentration of the inorganic particles in the mixed solution is 0.05-10%;
the polytetrafluoroethylene separation membrane in the step (3) is a polytetrafluoroethylene flat membrane or a polytetrafluoroethylene hollow fiber membrane, the pore diameter of the membrane is 0.1um-2um, the soaking temperature is 0-99 ℃, and the soaking time is 0-48 hours.
2. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 1, wherein the drying temperature in step (4) is 30-100 degrees celsius and the drying time is 5-60 minutes.
3. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 2, wherein the drying temperature in step (4) is preferably 30-60 degrees celsius, and the drying time is 5-60 minutes.
4. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 1, wherein the sintering temperature in step (5) is 200-310 degrees celsius and the sintering time is 0.5-30 minutes.
5. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 4, wherein the sintering temperature in step (5) is preferably 200-270 degrees celsius, and the sintering time is 0.5-30 minutes.
6. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 1, wherein the mass percentage concentration of organic molecules in said organic molecule solution in step (1) is preferably 1 to 5%.
7. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 6, wherein the concentration of organic molecules in said organic molecule solution in step (1) is more preferably 2 to 4% by mass.
8. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 1, wherein the mass percentage concentration of said inorganic particles in the mixed solution in step (2) is preferably 0.1 to 8%.
9. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 8, wherein the mass percentage concentration of said inorganic particles in the mixed solution in step (2) is more preferably 0.5 to 2%.
10. The method for preparing a durable hydrophilic polytetrafluoroethylene separation membrane according to claim 1, wherein the soaking temperature in step (3) is preferably 20-70 degrees celsius, and the soaking time is preferably 10-30 hours.
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| CN104001433A (en) * | 2014-05-14 | 2014-08-27 | 浙江舒普氟材科技有限公司 | Production process of hydrophilic polytetrafluoroethylene microporous film |
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