CN106669445B - Polytetrafluoroethylene superfine hollow fiber membrane - Google Patents
Polytetrafluoroethylene superfine hollow fiber membrane Download PDFInfo
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- CN106669445B CN106669445B CN201510764578.9A CN201510764578A CN106669445B CN 106669445 B CN106669445 B CN 106669445B CN 201510764578 A CN201510764578 A CN 201510764578A CN 106669445 B CN106669445 B CN 106669445B
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- polytetrafluoroethylene
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 45
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 45
- -1 Polytetrafluoroethylene Polymers 0.000 title claims abstract description 44
- 239000012528 membrane Substances 0.000 title claims abstract description 39
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 25
- 239000011148 porous material Substances 0.000 claims abstract description 101
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 239000002243 precursor Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 9
- 239000000839 emulsion Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 238000010041 electrostatic spinning Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 229920001661 Chitosan Polymers 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000009987 spinning Methods 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 abstract description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- 239000007788 liquid Substances 0.000 description 11
- 239000002253 acid Substances 0.000 description 10
- 238000000926 separation method Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000004821 distillation Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
- B01D69/04—Tubular 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Artificial Filaments (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a polytetrafluoroethylene superfine hollow fiber membrane, which comprises a polytetrafluoroethylene material bodyThe polytetrafluoroethylene is fibrous, the fiber diameter is 30-200 nm, the body is provided with a pore cavity with the pore diameter of 10-1000 nm and a cavity wall formed by surrounding the pore cavity in a three-dimensional space, the pore cavity is uniformly distributed, all the pore cavities are three-dimensionally communicated, and the pore cavity is uniformly distributed, namely all the pore cavities are uniformly distributed under any unit volume on the porous material; porosity is more than or equal to 75 percent, and tensile strength is 15N/mm2Above, water pressure resistance of 3kg/cm2The above. The invention provides a specific and definite measuring mode for the pore space distribution uniformity of the polytetrafluoroethylene hollow fiber membrane, and defines the pore distribution uniformity of the porous material and the multi-level structure thereof under the scale of small unit level volume, and the porous structure is highly uniform, thereby ensuring the uniformity and consistency of all performances of the porous material.
Description
Technical Field
The invention relates to a porous material, in particular to a polytetrafluoroethylene hollow fiber membrane.
Background
The solid porous material containing a certain number of holes is a material with a network structure formed by through or closed holes. Compared with continuous medium materials, porous materials generally have the advantages of low relative density, high specific strength, high specific surface area, light weight, sound insulation, heat insulation, good permeability and the like. According to the difference of pore size, porous materials can be divided into microporous (pore size less than 2 nm), mesoporous (pore size 2-50 nm) and macroporous (pore size greater than 50 nm).
The porous materials are classified into metal porous materials and non-metal porous materials according to the material thereof. The non-metal porous material has the characteristics of large specific surface area, small density, small heat conductivity, small relative density, large porosity and the like, and has wide application prospects in the fields of catalysts (including carriers), adsorbents, heat preservation, heat insulation, sewage and waste gas treatment, filtering of liquid and gas (even bacteria), light building materials, environmental protection, soil improvement, chemical engineering and the like. The polytetrafluoroethylene porous membrane material has the advantages of high temperature stability, high chemical stability, high electric insulation, high flame retardance, high self-lubrication performance and the like, and is wide in application range. However, due to the randomness, irregularity of the pore structure, it still does not meet many application properties.
In many applications, the porous material is required to be uniform, the pore size and the distribution of pores are uniform, so that the performance is uniform, but in practice, many porous materials cannot meet the requirement, and the uniformity is complemented; although some materials are self-claimed to achieve higher uniformity, the uniformity is still the uniformity under the scale of large volume, if the material is measured by the scale of small volume, for example, a plurality of three-dimensional bodies with the volume not more than one cubic centimeter are randomly selected on the material, the quality of the three-dimensional bodies is respectively measured, the uniformity difference is still very large, and therefore, various properties of the polytetrafluoroethylene porous membrane material, such as strength, elastic modulus, flux and the like, are not uniform, and the function of the polytetrafluoroethylene porous membrane material is seriously influenced.
Disclosure of Invention
The invention aims to provide a polytetrafluoroethylene hollow fiber membrane with a proper and controllable structure and uniform height.
The purpose of the invention is realized by the following measures:
a polytetrafluoroethylene superfine hollow fiber membrane comprises a polytetrafluoroethylene material body, wherein polytetrafluoroethylene is fibrous, the diameter of the fiber is 30-200 nm, the body is provided with a pore cavity with the pore diameter of 10-1000 nm and a cavity wall formed by surrounding the pore cavity in a three-dimensional space, the pore cavity is uniformly distributed, all the pore cavities are communicated in a three-dimensional mode, and the pore cavities are uniformly distributed, namely all the pore cavities are uniformly distributed in any unit volume on a porous material; porosity is more than or equal to 75 percent, and tensile strength is 15N/mm2Above, water pressure resistance of 3kg/cm2The above.
Specifically, the polytetrafluoroethylene hollow fiber membrane is provided with a pore cavity with the aperture of 30-1000 nm and a cavity wall formed by surrounding the pore cavity in a three-dimensional space, wherein a lower-level pore cavity with the aperture of 10-100 nm is arranged on the cavity wall, the pore cavities of all levels are respectively communicated in three dimensions, and the pore cavities of all levels are communicated with each other; the pore cavities are uniformly distributed, and the uniform distribution of the pore cavities means that all the pore cavities are uniformly distributed under any unit volume on the porous material.
Specifically, the unit-scale volume means a unit-scale volume on the order of cubic centimeters or cubic millimeters or less.
More specifically, the uniform distribution of the cavities means that three-dimensional bodies having a volume not greater than one cubic centimeter and the same size are arbitrarily taken on the porous material, and the masses of the three-dimensional bodies are substantially equivalent.
More specifically, the above-mentioned substantial equivalence means that a plurality of three-dimensional bodies having a volume of not more than one cubic centimeter and the same size are arbitrarily taken on the porous material, the masses thereof are respectively referred to, and the average value of the masses thereof is obtained, and the absolute value of the deviation of the mass of any one of the three-dimensional bodies from the average value of the masses is not more than 4% of the average value of the masses of the three-dimensional bodies.
Further, three-dimensional bodies of the same size having a volume of no more than one cubic millimeter are optionally taken on the multi-stage material and their masses are substantially equivalent.
More specifically, the substantial equivalence of the masses means that a plurality of three-dimensional bodies with the same size and the volume of not more than one cubic millimeter are taken on the porous material, the masses are respectively called, the average value of the masses of the three-dimensional bodies is obtained, and the absolute value of the deviation of the mass of any three-dimensional body relative to the average value of the masses is not more than 4% of the average value of the masses of the three-dimensional bodies.
Preferably, the polytetrafluoroethylene hollow fiber membrane is made of multi-stage porous materials, the body is composed of cavities graded according to the aperture size of the materials and cavity walls surrounding the cavities in a three-dimensional space, lower-stage cavities are arranged on the cavity walls, the cavities at all stages are communicated in three dimensions respectively, and the cavities at all stages are communicated with one another. More specifically, the next stage porous material forms the walls of the previous stage lumen. The cavity wall of the upper-level pore cavity is formed by compounding the lower-level multi-level porous materials or the lower-level multi-level porous materials, so that the material can meet specific functional requirements.
Specifically, each stage of the porous material of the material body is a continuous structure. The maximum outer boundary of each stage of porous material is equivalent to the spatial boundary of the whole material body. That is, each stage of porous material can exist in the body as a stage of independent porous material and has independent physicochemical properties. The structure can lead the physicochemical properties of porous materials at all levels to be different, has different physicochemical properties in the whole space of relatively fixed materials, and better meets the function requirements in various aspects.
Advantageous effects
1. The invention provides a polytetrafluoroethylene hollow fiber membrane with a porous structure, and the structural form, the hierarchical structural form of pore cavities and the uniform structure of the pore cavities of the polytetrafluoroethylene hollow fiber membrane are determined so that the polytetrafluoroethylene hollow fiber membrane can meet various functional requirements.
2. The invention provides a specific and definite measuring mode for the pore space distribution uniformity of the polytetrafluoroethylene hollow fiber membrane, and defines the pore distribution uniformity of the porous material and the multi-level structure thereof under the scale of small unit level volume, and the porous structure is highly uniform, thereby ensuring the uniformity and consistency of all performances of the porous material.
3. The polytetrafluoroethylene hollow fiber membrane is three-dimensionally communicated, comprises three-dimensionally communicated holes of each stage, is mutually three-dimensionally communicated with the holes of each stage, has good connectivity, and can fully meet the functional requirements of materials.
4. The polytetrafluoroethylene hollow fiber membrane of the invention is a hydrophobic surface with a multilevel coarse structure. The surface water contact angle can reach over 160 degrees.
5. The polytetrafluoroethylene porous fiber membrane, such as pore distribution, hierarchical structure, porosity, pore shape and other structural characteristics, process and the like are related to membrane performances such as mechanical strength, water pressure resistance and the like>42L/m2H, the retention rate is more than 99.8 percent, and the tensile strength can reach 30N/mm2Above, water pressure resistance of 5kg/cm2The above.
Detailed Description
The detailed embodiments are given on the premise of the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments. It will be apparent that various substitutions and alterations can be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims, based on common technical knowledge and/or common usage in the art.
Example 1
The polytetrafluoroethylene hollow fiber membrane has a secondary pore structure, wherein uniformly distributed and mutually communicated secondary pores are arranged on the wall of a uniformly distributed and mutually communicated primary pore, the two pores are mutually communicated, and the communication is three-dimensional. Each stage of porous material of the material body is a continuous structure. The total effective porosity is 75%, the fiber diameter is 150 +/-20 nm, the average pore diameter of the macropores is 0.45 mu m, and the wall of the macropores is provided with through pores with the average pore diameter of 30 nm.
9 pieces of three-dimensional bodies of the same size of 10mm × 10mm × 10mm were arbitrarily machined from the porous material, and the mass was measured on a Mettler-Torledo XP26 Microbalance balance, and the results are shown in Table 1, in which the absolute value of the deviation from the mean value is expressed in percentage, and the absolute value of the deviation from the mean value is divided by the mean value of the mass, as can be seen from Table 1, the mass deviation is not more than 4%.
TABLE 1
| Part number | Mass (mg) | Absolute value of deviation from average (%) |
| 1 | 631.381 | 3.7% |
| 2 | 653.399 | 0.4% |
| 3 | 665.596 | 1.5% |
| 4 | 652.498 | 0.5% |
| 5 | 652.918 | 0.5% |
| 6 | 662.294 | 1.0% |
| 7 | 669.294 | 2.0% |
| 8 | 657.379 | 0.2% |
| 9 | 658.884 | 0.4% |
| Mass average value | 655.960 |
The preparation method of the polytetrafluoroethylene porous material comprises the following steps:
(1) uniformly mixing polytetrafluoroethylene emulsion with the solid content of 60%, chitosan with the particle size of 30nm, polyacrylic acid solution with the particle size of 5% (mass ratio) and starch emulsion with the particle size of 20wt%, and mixing the components according to the weight ratio of 50: 25: 4: 4, preparing a spinning solution;
(2) preparing a polytetrafluoroethylene precursor film in an oriented electrostatic spinning fiber device by adopting an electrostatic spinning method under a vacuum condition;
(3) winding 5 layers of the precursor film on a cylinder supporting die, sending the precursor film into a tube furnace, sintering the precursor film in vacuum or protective atmosphere, adopting program temperature control segmented continuous sintering, heating the precursor film from room temperature to 160 ℃ at the speed of 5 ℃/min, and keeping the temperature at 160 ℃ for 80 min; heating to 280 deg.C at a rate of 5 deg.C/min, and maintaining the temperature at 280 deg.C for 60 min; heating to 360 deg.C at a rate of 2 deg.C/min, and maintaining at 360 deg.C for 20 min; heating to 400 deg.C at a rate of 6 deg.C/min, and maintaining at 400 deg.C for 60 min.
(4) And (3) performing temperature-controlled cooling by a program after sintering, and performing subsequent treatment according to a conventional technology to obtain the porous polytetrafluoroethylene hollow fiber membrane with a two-stage pore structure, wherein the thickness of the porous polytetrafluoroethylene hollow fiber membrane is 158 micrometers, and the diameter of the fiber membrane is less than 3 mm.
The polytetrafluoroethylene hollow fiber membrane does not need to be supported, has stable shape and controllable thickness, can be used for gas-liquid separation and liquid-liquid separation, realizes accurate classified filtration, is suitable for filtering binary or multi-element gas (liquid), has large flux and high retention rate, is not easy to be polluted (such as the pollution of an infiltration membrane of multi-element liquid), and has the advantages of high efficiency and long acting. The film water contact angle is 168 degrees; tensile strength of 30N/mm2Water pressure resistance of 5kg/cm2。
For example, the total flux can reach 42kg/m in the membrane distillation of an acid/alcohol-water-non-volatile solute system2H or more, the retention rate of non-volatile solute in the system is more than 99.8%, and the separation factor of volatile alcohol/acid = [ mass fraction of alcohol/acid in distillate × (1-mass fraction of raw material liquid alcohol/acid) ]]Div [ raw material solution alcohol/acid mass fraction x (1-distillate alcohol/acid mass fraction)]Up to 10 or more.
Example 2
The polytetrafluoroethylene hollow fiber membrane has a three-stage pore structure, wherein uniformly distributed and mutually communicated second-stage pores are arranged on the wall of a uniformly distributed and mutually communicated first-stage pore and are mutually communicated, and the two-stage pores are also mutually communicated, and the communication is three-dimensional. Each stage of porous material of the material body is a continuous structure. The total effective porosity is 85%, the fiber diameter is 180 +/-20 nm, the average pore diameter of the macropores is 800nm, through secondary pores with the average pore diameter of 60nm are arranged on the wall of the macropores, and through tertiary pores with the average pore diameter of 10nm are arranged on the walls of the secondary pores.
Any 9 pieces of 10mm × 10mm × 10mm three-dimensional bodies of the same size were mechanically processed on the porous material, and the mass was measured on a mertler-toledo XP26 Microbalance balance, and the results are shown in table 1, in which the absolute value of the deviation from the mean value is expressed in percentage, and the absolute value of the deviation from the mean value is divided by the mean value of the mass, as can be seen from table 2, the mass deviation is not more than 4%.
TABLE 2
| Part number | Mass (mg) | Absolute value of deviation from average (%) |
| 1 | 510.066 | 0.5% |
| 2 | 500.721 | 1.3% |
| 3 | 500.838 | 1.3% |
| 4 | 511.821 | 0.9% |
| 5 | 510.414 | 0.6% |
| 6 | 509.184 | 0.3% |
| 7 | 513.855 | 1.3% |
| 8 | 500.251 | 1.4% |
| 9 | 510.000 | 0.5% |
| Mass average value | 507.461 |
The preparation method of the polytetrafluoroethylene porous material comprises the following steps:
(1) mixing PTFE fine powder and polyethylene glycol with the molecular weight of 1000, stirring and heating to 380 ℃, continuously stirring for 60min, rapidly cooling to room temperature for crushing, and crushing at the temperature below zero ℃ to obtain polytetrafluoroethylene particles;
(2) dispersing polytetrafluoroethylene particles with the particle size of 200nm to prepare an emulsion with the solid content of 60%, uniformly mixing the emulsion with chitosan with the particle size of 100nm, polyacrylic acid solution with the mass ratio of 5% and starch emulsion with the mass ratio of 20wt%, and mixing the emulsion according to the weight ratio of 50: 25: 4: 4, preparing a spinning solution;
(3) preparing a polytetrafluoroethylene precursor film in an oriented electrostatic spinning fiber device by adopting an electrostatic spinning method under a vacuum condition;
(4) winding 5 layers of the precursor film on a cylinder supporting die, sending the precursor film into a tube furnace, sintering the precursor film in vacuum or protective atmosphere, adopting program temperature control segmented continuous sintering, heating the precursor film from room temperature to 160 ℃ at the speed of 5 ℃/min, and keeping the temperature at 160 ℃ for 80 min; heating to 290 deg.C at a rate of 5 deg.C/min, and maintaining at 290 deg.C for 60 min; heating to 360 deg.C at a rate of 2 deg.C/min, and maintaining at 360 deg.C for 20 min; heating to 400 deg.C at a rate of 6 deg.C/min, and maintaining at 400 deg.C for 60 min;
(5) and (3) performing temperature-programmed cooling after sintering, and performing subsequent treatment according to a conventional technology to obtain the porous polytetrafluoroethylene hollow membrane with the three-level pore structure, wherein the thickness of the porous polytetrafluoroethylene hollow membrane is 165 mu m, and the diameter of the fiber membrane is less than 3 mm.
The polytetrafluoroethylene hollow fiber membrane does not need to be supported, has stable shape and controllable thickness, can be used for gas-liquid separation and liquid-liquid separation, realizes accurate classified filtration, is suitable for filtering binary or multi-element gas (liquid), has large flux and high retention rate, is not easy to be polluted (such as the pollution of an infiltration membrane of multi-element liquid), and has the advantages of high efficiency and long acting. The film water contact angle is 170 degrees; tensile strength of 28N/mm2Water pressure resistance of 7kg/cm2。
For example, the total flux can reach 42kg/m in the membrane distillation of a multi (or mixed) alcohol/acid-water-non-volatile solute system2H is more than h, the rejection rate of non-volatile solute in the system is more than 99.9 percent, and the separation factor of volatile alcohol/acid = [ mass fraction of alcohol/acid in distillate × (1-mass fraction of raw material liquid ethanol)]Div [ raw material solution alcohol/acid mass fraction x (1-distillate alcohol/acid mass fraction)]Up to 10 or more.
Claims (1)
1. A polytetrafluoroethylene hollow fiber membrane has a secondary pore structure, wherein uniformly distributed and mutually communicated secondary pores are arranged on the wall of a uniformly distributed and mutually communicated primary pore, the two pores are mutually communicated, and the communication is three-dimensional; each stage of porous material of the material body is a continuous structure; the total effective porosity is 75%, the fiber diameter is 150 +/-20 nm, the average pore diameter of the macropores is 0.45 mu m, and the wall of the macropores is provided with through pores with the average pore diameter of 30 nm;
the preparation method of the polytetrafluoroethylene hollow fiber membrane comprises the following steps:
(1) uniformly mixing polytetrafluoroethylene emulsion with the solid content of 60%, chitosan with the particle size of 30nm, polyacrylic acid solution with the particle size of 5wt% and starch emulsion with the particle size of 20wt%, and mixing the components according to the weight ratio of 50: 25: 4: 4, preparing a spinning solution;
(2) preparing a polytetrafluoroethylene precursor film in an oriented electrostatic spinning fiber device by adopting an electrostatic spinning method under a vacuum condition;
(3) winding 5 layers of the precursor film on a cylinder supporting die, sending the precursor film into a tube furnace, sintering the precursor film in vacuum or protective atmosphere, adopting program temperature control segmented continuous sintering, heating the precursor film from room temperature to 160 ℃ at the speed of 5 ℃/min, and keeping the temperature at 160 ℃ for 80 min; heating to 280 deg.C at a rate of 5 deg.C/min, and maintaining the temperature at 280 deg.C for 60 min; heating to 360 deg.C at a rate of 2 deg.C/min, and maintaining at 360 deg.C for 20 min; heating to 400 deg.C at a rate of 6 deg.C/min, and maintaining at 400 deg.C for 60 min;
(4) and (3) performing temperature-controlled cooling by a program after sintering, and performing subsequent treatment according to a conventional technology to obtain the porous polytetrafluoroethylene hollow fiber membrane with a two-stage pore structure, wherein the thickness of the porous polytetrafluoroethylene hollow fiber membrane is 158 micrometers, and the diameter of the fiber membrane is less than 3 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510764578.9A CN106669445B (en) | 2015-11-11 | 2015-11-11 | Polytetrafluoroethylene superfine hollow fiber membrane |
| PCT/CN2016/105226 WO2017080455A1 (en) | 2015-11-11 | 2016-11-09 | Polytetrafluoroethylene superfine hollow fiber membrane |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510764578.9A CN106669445B (en) | 2015-11-11 | 2015-11-11 | Polytetrafluoroethylene superfine hollow fiber membrane |
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| CN106669445B true CN106669445B (en) | 2020-11-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103894077A (en) * | 2014-04-10 | 2014-07-02 | 江南大学 | Composite filter membrane with multidimensional pore structure and preparation method thereof |
| CN104906968A (en) * | 2014-03-13 | 2015-09-16 | 成都百途医药科技有限公司 | Teflon membrane and preparation method thereof |
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| GB1527592A (en) * | 1974-08-05 | 1978-10-04 | Ici Ltd | Wound dressing |
| JP4659241B2 (en) * | 2001-03-19 | 2011-03-30 | ジャパンゴアテックス株式会社 | Polytetrafluoroethylene membrane and method for producing the same |
| CN101530750A (en) * | 2009-04-20 | 2009-09-16 | 浙江理工大学 | Preparation method of polytetrafluoroethylene superfine fiber porous membrane |
| CN102151493A (en) * | 2011-03-18 | 2011-08-17 | 上腾新材料科技（苏州）有限公司 | Method for preparing nano polytetrafluoroethylene microporous membrane |
| CN103212308A (en) * | 2012-08-01 | 2013-07-24 | 上海市凌桥环保设备厂有限公司 | Polytetrafluoroethylene millipore membrane for purifying PM2.5 |
| CN105013344B (en) * | 2014-04-22 | 2017-12-08 | 成都百途医药科技有限公司 | A kind of preparation method of super-hydrophobic polytetrafluoroethylfiber fiber film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104906968A (en) * | 2014-03-13 | 2015-09-16 | 成都百途医药科技有限公司 | Teflon membrane and preparation method thereof |
| CN103894077A (en) * | 2014-04-10 | 2014-07-02 | 江南大学 | Composite filter membrane with multidimensional pore structure and preparation method thereof |
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| CN106669445A (en) | 2017-05-17 |
| WO2017080455A1 (en) | 2017-05-18 |
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