CN101530750A - Preparation method of polytetrafluoroethylene superfine fiber porous membrane - Google Patents
Preparation method of polytetrafluoroethylene superfine fiber porous membrane Download PDFInfo
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- CN101530750A CN101530750A CN200910097865A CN200910097865A CN101530750A CN 101530750 A CN101530750 A CN 101530750A CN 200910097865 A CN200910097865 A CN 200910097865A CN 200910097865 A CN200910097865 A CN 200910097865A CN 101530750 A CN101530750 A CN 101530750A
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 108
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 108
- 239000012528 membrane Substances 0.000 title claims abstract description 66
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 57
- 239000000835 fiber Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000009987 spinning Methods 0.000 claims abstract description 49
- 239000002131 composite material Substances 0.000 claims abstract description 29
- 229920000642 polymer Polymers 0.000 claims abstract description 19
- 238000005245 sintering Methods 0.000 claims abstract description 19
- 239000011159 matrix material Substances 0.000 claims abstract description 18
- 239000000839 emulsion Substances 0.000 claims abstract description 17
- 238000010041 electrostatic spinning Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000005684 electric field Effects 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 5
- 229920001410 Microfiber Polymers 0.000 claims description 28
- 239000002202 Polyethylene glycol Substances 0.000 claims description 25
- 229920001223 polyethylene glycol Polymers 0.000 claims description 25
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 23
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 239000001856 Ethyl cellulose Substances 0.000 claims description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 2
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 229920006184 cellulose methylcellulose Polymers 0.000 claims description 2
- 229920001249 ethyl cellulose Polymers 0.000 claims description 2
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 2
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims description 2
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 2
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 2
- 229920000609 methyl cellulose Polymers 0.000 claims description 2
- 239000001923 methylcellulose Substances 0.000 claims description 2
- 235000010981 methylcellulose Nutrition 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 230000002045 lasting effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012822 chemical development Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001523 electrospinning Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000002910 structure generation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Nonwoven Fabrics (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention discloses a preparation method of polytetrafluoroethylene superfine fiber porous membrane. In the method, high concentration polytetrafluoroethylene aqueous emulsion is mixed with matrix polymer uniformly to prepare spinning solution. With the effect of high voltage electric field, polytetrafluoroethylene/matrix polymer composite superfine fiber porous membrane with the diameter of 100 nm to 2 [mu]m is obtained by electrostatic spinning, and then polytetrafluoroethylene superfine fiber porous membrane is formed at the conditions of sintering temperature being 330 to 500 DEG C and the sintering time lasting 30s to 5min so that the aperture diameter is 100 nm to 10 [mu]m and the porosity is 50% to 80%. The polytetrafluoroethylene superfine fiber porous membrane prepared by using the method has uniform aperture diameter and high porosity, and can be widely applied to filter material. Compared with the existing technology, the preparation method has the characteristics of simple processing technology, short process and low cost.
Description
Technical field
The present invention relates to the technology of functional fibre membrane material and preparation thereof, especially relate to a kind of preparation method of polytetrafluoroethylsuperfine superfine fiber porous membrane.
Background technology
Along with the continuous quickening of countries in the world process of industrialization, atmosphere pollution, water pollutes has become a serious day by day problem, and to the balance of ecology, human existence has proposed acid test.Meanwhile, industries such as semi-conductor industry, precision instrument industry, bioprocess technology require more and more higher to the pure degree of air.
In order to satisfy above-mentioned requirements, existing many kinds of filter mediums are developed and practicability.Wherein, polytetrafluoroethylene (PTFE) is because its serviceability temperature scope wide (200～260 ℃) has excellent chemical stability, good low frictional properties and good insulation performance and thermal insulation simultaneously.Therefore, polytetrafluoroethylene (PTFE) has broad application prospects as the raw material of making filtering material.The processing of polytetrafluoroethylporous porous membrane mainly contains two lines, the one, in polytetrafluoroethylene (PTFE), add pore former such as sodium chloride, then polytetrafluoroethylene (PTFE) is made film, subsequently sodium chloride is removed by adding hot water wash, the room that sodium chloride stays promptly forms space (U.S. Pat P No.4,863,604).The 2nd, adopt the method production of unidirectional or biaxial tension, constitute by the node of island and fine fibril fully through the perforated membrane of longitudinal stretching at draw direction, again by after the horizontal stretching, island structure divides, form fenestral fabric (the Ken-ichi Kurumada of inclination, Structure generation inPTFE porous membranes induced by the uniaxial and biaxial stretching operations, Journal of Membrane Science 149 (1998) 51-57; Chinese patent CN 1042498C, polytetrafluoroethylporous porous membrane and manufacture method thereof).But because polytetrafluoroethylene (PTFE) fusing point height, melt viscosity is big, so its manufacture method employing nconventional method, and whole complex manufacturing technology, operation are grown, influence factor is many.
Electrostatic spinning be high polymer molten or solution under the effect of high voltage electric field, fluid overcomes surface tension, stretches under the effect of electric field force, through cooling or solution evaporation, forms superfine fibre.This method equipment is simple, easy to operate, be easy to control, the fibre diameter that makes from tens nanometers to several microns.Pile up formed together superfine fibre film and have big specific area by these fibers are random, high porosity, be interconnected between the hole and constitute irregular duct, be difficult for stopping up, when guaranteeing excellent strainability, have good permeability again, aspect filtration, have broad application prospects.
Summary of the invention
The objective of the invention is to utilize the water-soluble base polymer to make high concentration polytetrafluoroethylene (PTFE) aqueous emulsion obtain spinning properties, and develop a kind of preparation method of polytetrafluoroethylsuperfine superfine fiber porous membrane by electrostatic spinning.
The technical solution used in the present invention is:
This method may further comprise the steps:
1) preparation spinning solution:
Matrix polymer is soluble in water, continue to stir, until dissolving fully, mix with high concentration polytetrafluoroethylene (PTFE) aqueous emulsion again, prepare spinning solution;
2) electrostatic spinning:
Spinning solution is encased in the device for storing liquid, is transported to spinning head, under the effect of high voltage electric field, form the composite ultrafine fiber perforated membrane of polytetrafluoroethylene (PTFE) and matrix polymer by the micro-measurement pump;
3) preparation of polytetrafluoroethylsuperfine superfine fiber porous membrane:
In the agglomerating plant of routine, to remove matrix polymer, sintering temperature is 330～500 ℃ with described composite ultrafine fiber perforated membrane sintering, and sintering time is 30s～5min, prepares polytetrafluoroethylsuperfine superfine fiber porous membrane.
Described matrix polymer is a polyvinyl alcohol, polyethylene glycol oxide, polyethylene glycol, polyacrylamide, methylcellulose, ethyl cellulose, CMC, hydroxyethylcellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose and any two kinds combination.
The weight percent concentration of polytetrafluoroethylene (PTFE) is 58%-62% in the described high concentration polytetrafluoroethylene (PTFE) aqueous emulsion.
Described spinning solution solid content percentage by weight is 15%-50%, and wherein the mass ratio of polytetrafluoroethylene (PTFE) and matrix polymer is 50:50～95:5.
Described spinning head is one or more, and link to each other with dc high voltage electric field, voltage is positive 5kV～40kV, receiving system ground connection, carry out electrostatic spinning, make the composite ultrafine fiber of polytetrafluoroethylene (PTFE)/matrix polymer, the random composite ultrafine fiber perforated membrane of piling up formation polytetrafluoroethylene (PTFE)/matrix polymer of composite ultrafine fiber, superfine fibre fibre diameter are 100nm～2 μ m.
Described polytetrafluoroethylsuperfine superfine fiber porous membrane is to pile up by polytetrafluoroethylsuperfine superfine fiber is random that mutual intersection is bonding to form, and the diameter of polytetrafluoroethylsuperfine superfine fiber is 100nm～5 μ m, and the aperture of perforated membrane is 100nm-10 μ m, and porosity is 50-80%.
Described high concentration polytetrafluoroethylene (PTFE) aqueous emulsion can adopt the commercially available prod, as FR301G, FR301B, the FR303A of the Shanghai strongly fragrant fluorine chemical development in science and technology of brocade Co., Ltd, the mixture of a kind of or the said goods among the SFN-1 of Zhong Hao Chenguang Research Institute of Chemical Industry, SFN-3, SFN-A, the SFN-SA.Wherein the weight percent concentration of polytetrafluoroethylene (PTFE) is approximately 58%-62%, and is preferred 60%, and the polytetrafluoroethylene (PTFE) particle diameter is 0.05-0.2 μ m, and the kinematic viscosity of emulsion is 6-15mm
2/ s (25 ℃), Acidity of Aikalinity pH 〉=8, density is 1.50-1.55g/cm
3(20 ℃).
The beneficial effect that the present invention has is:
Polytetrafluoroethylsuperfine superfine fiber porous membrane by method for preparing is a brown, and the aperture is even, and the porosity height can satisfy the needs of filtration.Processing technology of the present invention is simple, flow process short, and cost is low.
Description of drawings
Fig. 1 is polytetrafluoroethylene (PTFE)/polyvinyl alcohol composite ultrafine fiber perforated membrane stereoscan photograph.
Fig. 2 is polytetrafluoroethylene (PTFE)/polyethylene glycol oxide composite ultrafine fiber perforated membrane stereoscan photograph.
Fig. 3 is to be the resulting polytetrafluoroethylsuperfine superfine fiber porous membrane stereoscan photograph of matrix polymer sintering with the polyvinyl alcohol.
Fig. 4 is to be the resulting polytetrafluoroethylsuperfine superfine fiber porous membrane stereoscan photograph of matrix polymer sintering with the polyethylene glycol oxide.
The specific embodiment
Embodiment 1:
To be dissolved in the 12.37ml water under 90 ℃ of conditions of 1.56g polyvinyl alcohol, mix with 6.07g high concentration polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 26%, and polytetrafluoroethylene (PTFE) and polyvinyl alcohol mass ratio are 70: 30 spinning solution.Add in the fluid reservoir then, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, distance is controlled at 15cm between spinning head and receiving device, flow rate of liquid 0.01ml/min, voltage 15kV, electrostatic spinning obtain polytetrafluoroethylene (PTFE)/polyvinyl alcohol composite ultrafine fiber perforated membrane, with scanning electron microscopic observation (seeing accompanying drawing 1).Is 390 ℃ of following sintering 2min with the composite ultrafine fiber perforated membrane that obtains in temperature, removes polyvinyl alcohol, obtains the polytetrafluoroethylsuperfine superfine fiber porous membrane of brown, with scanning electron microscopic observation (seeing accompanying drawing 3).
Embodiment 2:
To be dissolved in the 14.13ml water under 90 ℃ of conditions of 2.2g polyvinyl alcohol, mix with 3.67g high concentration polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 26%, and polytetrafluoroethylene (PTFE) and polyvinyl alcohol mass ratio are 50: 50 spinning solution.Add then in the fluid reservoir, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, distance is controlled at 15cm between spinning head and receiving device, flow rate of liquid 0.01ml/min, voltage 15kV, electrostatic spinning obtain polytetrafluoroethylene (PTFE)/polyvinyl alcohol composite ultrafine fiber perforated membrane.Is 390 ℃ of following sintering 2min with the composite ultrafine fiber perforated membrane that obtains in temperature, removes polyvinyl alcohol, obtains the polytetrafluoroethylsuperfine superfine fiber alkene perforated membrane of brown.
Embodiment 3:
To be dissolved in the 12.37ml water under 90 ℃ of conditions of 1.56g polyvinyl alcohol, mix with 6.07g high concentration polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 26%, and polytetrafluoroethylene (PTFE) and polyvinyl alcohol mass ratio are the spinning solution of 70:30.Add then in the fluid reservoir, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, distance is controlled at 14cm between spinning head and receiving device, flow rate of liquid 0.008ml/min, voltage 17kV, electrostatic spinning obtain polytetrafluoroethylene (PTFE)/polyvinyl alcohol composite ultrafine fiber perforated membrane.Is 390 ℃ of following sintering 2min with the composite ultrafine fiber perforated membrane that obtains in temperature, removes polyvinyl alcohol, obtains the polytetrafluoroethylsuperfine superfine fiber porous membrane of brown.
Embodiment 4:
To be dissolved in the 12.37ml water under 90 ℃ of conditions of 1.56g polyvinyl alcohol, mix with 6.07g high concentration polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 26%, and polytetrafluoroethylene (PTFE) and polyvinyl alcohol mass ratio are the spinning solution of 70:30.Add then in the fluid reservoir, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, distance is controlled at 15cm between spinning head and receiving device, flow rate of liquid 0.01ml/min, voltage 15kV, electrostatic spinning obtain polytetrafluoroethylene (PTFE)/polyvinyl alcohol composite ultrafine fiber perforated membrane.Is 350 ℃ of following sintering 4min with the composite ultrafine fiber perforated membrane that obtains in temperature, removes polyvinyl alcohol, obtains the polytetrafluoroethylsuperfine superfine fiber porous membrane of brown.
Embodiment 5:
To be dissolved in the 2.17ml water under the 0.2632g polyethylene glycol oxide room temperature condition, mix with 8.33g high concentration polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 49%, and polytetrafluoroethylene (PTFE) and polyethylene glycol oxide mass ratio are the spinning solution of 95:5.Add in the fluid reservoir then, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, distance is controlled at 12cm between spinning head and receiving device, flow rate of liquid 0.01ml/min, voltage 23kV, electrostatic spinning obtain polytetrafluoroethylene (PTFE)/polyethylene glycol oxide composite ultrafine fiber perforated membrane, with scanning electron microscopic observation (seeing accompanying drawing 2).Is 430 ℃ of following sintering 3min with the composite ultrafine fiber perforated membrane that obtains in temperature, removes polyethylene glycol oxide, obtains the polytetrafluoroethylsuperfine superfine fiber porous membrane of brown, with scanning electron microscopic observation (seeing accompanying drawing 4).
Embodiment 6:
To be dissolved in the 3.47ml water under 90 ℃ of conditions of 0.3191g polyethylene glycol oxide, mix with 4.79g high concentration polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 37%, and polytetrafluoroethylene (PTFE) and polyethylene glycol oxide mass ratio are 90:10.Add then in the fluid reservoir, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, distance is controlled at 12cm between spinning head and receiving device, flow rate of liquid 0.01ml/min, voltage 23kV, electrostatic spinning obtain polytetrafluoroethylene (PTFE)/polyethylene glycol oxide composite ultrafine fiber perforated membrane.Is 430 ℃ of following sintering 3min with the composite ultrafine fiber perforated membrane that obtains in temperature, removes polyethylene glycol oxide, obtains the polytetrafluoroethylsuperfine superfine fiber porous membrane of brown.
Embodiment 7:
To be dissolved in the 2.17ml water under the 0.2632g polyethylene glycol oxide room temperature condition, mix with 8.33g high concentration polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 49%, and polytetrafluoroethylene (PTFE) and polyethylene glycol oxide mass ratio are the spinning solution of 95:5.Add then in the fluid reservoir, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, distance is controlled at 14cm between spinning head and receiving device, flow rate of liquid 0.008ml/min, voltage 30kV, electrostatic spinning obtain polytetrafluoroethylene (PTFE)/polyethylene glycol oxide composite ultrafine fiber perforated membrane.Is 430 ℃ of following sintering 3min with the composite ultrafine fiber perforated membrane that obtains in temperature, removes polyethylene glycol oxide, obtains the polytetrafluoroethylsuperfine superfine fiber porous membrane of brown.
Embodiment 8:
To be dissolved in the 2.17m1 water under the 0.2632g polyethylene glycol oxide room temperature condition, mix with 8.33g high concentration polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 49%, and polytetrafluoroethylene (PTFE) and polyethylene glycol oxide mass ratio are the spinning solution of 95:5.Add then in the fluid reservoir, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, distance is controlled at 14cm between spinning head and receiving device, flow rate of liquid 0.008ml/min, voltage 30kV, electrostatic spinning obtain polytetrafluoroethylene (PTFE)/polyethylene glycol oxide composite ultrafine fiber perforated membrane.Is 450 ℃ of following sintering 5min with the composite ultrafine fiber perforated membrane that obtains in temperature, removes polyethylene glycol oxide, obtains the polytetrafluoroethylsuperfine superfine fiber porous membrane of brown.
Embodiment 9:
To be dissolved in the 24.05ml water under 90 ℃ of conditions of 1.46g polyvinyl alcohol, add 0.62g polyethylene glycol oxide stirring and dissolving subsequently, mix with 13.87g polytetrafluoroethylene (PTFE) aqueous emulsion then, being made into solid content is 26%, and polytetrafluoroethylene (PTFE) is the spinning solution of 80:14:6 with the ratio of polyvinyl alcohol quality and polyethylene glycol oxide.Add then in the fluid reservoir, be transported to spinning head by the micro-measurement pump, spinning head connects high-voltage positive electrode, and distance is controlled at about 15cm between spinning head and receiving device, flow rate of liquid 0.01ml/h, and voltage 11kv, electrospinning obtains superfine fiber porous membrane.Is 450 ℃ of following sintering 2min with the superfine fiber porous membrane that obtains in temperature, removes polyvinyl alcohol and polyethylene glycol oxide, obtains umbrinaceous polytetrafluoroethylporous porous membrane.
Claims (6)
1, a kind of preparation method of polytetrafluoroethylsuperfine superfine fiber porous membrane is characterized in that, this method may further comprise the steps:
1) preparation spinning solution:
Matrix polymer is soluble in water, continue to stir, until dissolving fully, mix with high concentration polytetrafluoroethylene (PTFE) aqueous emulsion again, prepare spinning solution;
2) electrostatic spinning:
Spinning solution is encased in the device for storing liquid, is transported to spinning head, under the effect of high voltage electric field, form the composite ultrafine fiber perforated membrane of polytetrafluoroethylene (PTFE) and matrix polymer by the micro-measurement pump;
3) preparation of polytetrafluoroethylsuperfine superfine fiber porous membrane:
In the agglomerating plant of routine, to remove matrix polymer, sintering temperature is 330～500 ℃ with described composite ultrafine fiber perforated membrane sintering, and sintering time is 30s～5min, prepares polytetrafluoroethylsuperfine superfine fiber porous membrane.
2, the preparation method of a kind of polytetrafluoroethylsuperfine superfine fiber porous membrane according to claim 1, it is characterized in that: described matrix polymer is a polyvinyl alcohol, polyethylene glycol oxide, polyethylene glycol, polyacrylamide, methylcellulose, ethyl cellulose, CMC, hydroxyethylcellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose and any two kinds combination.
3, the preparation method of a kind of polytetrafluoroethylsuperfine superfine fiber porous membrane according to claim 1 is characterized in that: the weight percent concentration of polytetrafluoroethylene (PTFE) is 58%-62% in the described high concentration polytetrafluoroethylene (PTFE) aqueous emulsion.
4, the preparation method of polytetrafluoroethylsuperfine superfine fiber porous membrane according to claim 1 is characterized in that, described spinning solution solid content percentage by weight is 15%-50%, and wherein the mass ratio of polytetrafluoroethylene (PTFE) and matrix polymer is 50:50～95:5.
5, the preparation method of a kind of polytetrafluoroethylsuperfine superfine fiber porous membrane according to claim 1, it is characterized in that: described spinning head is one or more, and link to each other with dc high voltage electric field, voltage is positive 5kV～40kV, receiving system ground connection, carry out electrostatic spinning, make the composite ultrafine fiber of polytetrafluoroethylene (PTFE)/matrix polymer, the random composite ultrafine fiber perforated membrane of piling up formation polytetrafluoroethylene (PTFE)/matrix polymer of composite ultrafine fiber, superfine fibre fibre diameter are 100nm～2 μ m.
6, the preparation method of a kind of polytetrafluoroethylsuperfine superfine fiber porous membrane according to claim 1, it is characterized in that: described polytetrafluoroethylsuperfine superfine fiber porous membrane is to pile up by polytetrafluoroethylsuperfine superfine fiber is random that mutual intersection is bonding to form, the diameter of polytetrafluoroethylsuperfine superfine fiber is 100nm～5 μ m, the aperture of perforated membrane is 100nm-10 μ m, and porosity is 50-80%.
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