CN103191653A - Method for forming asymmetric polytetrafluoroethylene porous membrane - Google Patents
Method for forming asymmetric polytetrafluoroethylene porous membrane Download PDFInfo
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- CN103191653A CN103191653A CN2012100074932A CN201210007493A CN103191653A CN 103191653 A CN103191653 A CN 103191653A CN 2012100074932 A CN2012100074932 A CN 2012100074932A CN 201210007493 A CN201210007493 A CN 201210007493A CN 103191653 A CN103191653 A CN 103191653A
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Abstract
The invention provides a method for forming an asymmetric polytetrafluoroethylene porous membrane. The method can simply produce an asymmetric polytetrafluoroethylene porous membrane and optimizes membrane performance. The method provided by the invention is realized through the following technical scheme: a symmetry polytetrafluoroethylene porous membrane is subjected to multiple extrusion treatments between a steel roller and a rubber roller; the rubber roller has surface hardness of 30-60A; and the extrusion treatment comprises conditions of: temperature of 20-250 DEG C, pressure of 46-90N / cm, speed of 0.9-1.8m / min and extrusion for 3-20 times.
Description
Technical field
The present invention relates to a kind of method that forms polytetrafluoroethylporous porous membrane, especially relate to a kind of method that forms asymmetric polytetrafluoroethylporous porous membrane.
Background technology
Polytetrafluoroethylporous porous membrane (hereinafter referred to as the PTFE perforated membrane) has extremely widely in various fields such as medicine, electronics, chemical industry, environmental protection, food and uses owing to have good chemical stability and heat endurance.
US Patent No. 3953566 discloses the method by the manufacturing PTFE perforated membrane that stretches the earliest, its method is: the mixture of PTFE resin and extrusion aid through extrude, after dry, the calendering, stretch again and heat setting, obtain being constituted by countless fentos and node the perforated membrane of microcellular structure.The fento of this perforated membrane and the size of node to another side uniformity, and then are uniformly at inside and two surface apertures of film from a side of film, are symmetric membranes.
Anisotropic membrane has advantages such as pressure reduction is little, the life-span is long with respect to symmetric membrane, is widely used at the film separation field.Liquid one solid phase conversion method is the common method of making anisotropic membrane.International monopoly WO95/02447 discloses a kind of manufacture method of asymmetric PTFE perforated membrane, and its method is to utilize the perfluorinated cycloalkanes solution inversion of phases of PTFE to make asymmetric PTFE perforated membrane.The weak point of phase inversion is that to dissolve the solvent of PTFE few, and generally needs high temperature to dissolve.
Pulling method also can be made asymmetric PTFE perforated membrane.Method is in the past utilized film before stretching or when stretching or after stretching mostly, and temperature distribution gradient on the thickness direction of film obtains the PTFE perforated membrane of unsymmetric structure.Stretch as US Patent No. 4248429 different pair of rolls of serviceability temperature when stretching, owing to form anisotropic membrane under the acting in conjunction of the pressure that tension force causes and thickness direction temperature distribution gradient.The single face of the PTFE film that US Patent No. 2009/0159526 will be rolled, make after the drying stretches, heat setting after heating more than the fusing point again, obtains asymmetric PTFE perforated membrane.When Chinese patent CN1533882 is cooled to a face of the symmetry PTFE perforated membrane that stretches below 0 ℃, under 260～380 ℃, another face is carried out heat treated, obtain the asymmetric PTFE perforated membrane that the porous layer by high compactness top layer and continuous air bubbles constitutes.These utilize temperature gradient distribution to obtain the method for dissymmetrical structure, have shortcomings such as temperature control requirement height.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of method that forms asymmetric PTFE perforated membrane is provided.
The present invention is achieved by following technical proposals: symmetric PTFE perforated membrane is carried out repeatedly extrusion process between steel rider and rubber roll, wherein the case hardness of rubber roll is 30～60A; During extrusion process, temperature is 20～250 ℃, and pressure is 46～90N/cm, and speed is 0.9～1.8m/min, and the extruding number of times is 3～20 times, preferably 5～20 times.
Symmetry PTFE perforated membrane can be the PTFE perforated membrane of simple tension or the PTFE perforated membrane of biaxial tension.
Steel rider can use chrome faced mirror roller, and rubber roll can use silica gel roller, polyurethane rubber roller, butyronitrile rubber roller etc.
According to the method described in the present invention, symmetric PTFE perforated membrane is after extruding, surface (hereinafter referred to as the steel rider face) of its contact steel rider becomes the compacted zone that directly links to each other between node and the node, and the surface (hereinafter referred to as the rubber roll face) of contact rubber roll still be node with node between the porous layer that links to each other by fiber, have unsymmetric structure.
The invention has the beneficial effects as follows by simple method to make the PTFE perforated membrane have unsymmetric structure, optimized the performance of film.
Description of drawings
Fig. 1 is the device schematic diagram of one of embodiment of the invention.
Fig. 2 is the scanning electron microscope image (* 1000 times) of the rubber roll face of the asymmetric PTFE perforated membrane that forms of the embodiment of the invention 2.
Fig. 3 is the scanning electron microscope image (* 1000 times) of the steel rider face of the asymmetric PTFE perforated membrane that forms of the embodiment of the invention 2.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
In Fig. 1, symmetric PTFE perforated membrane from roll up 1 emit after, pass through steel rider 11 and rubber roll 12 successively, steel rider 21 and rubber roll 22, steel rider 31 and rubber roll 32, steel rider 41 and rubber roll 42, the extruding of many pair rollers such as steel rider 51 and rubber roll 52, rolling is to rolling up 8 again.Wherein, 2,3,4,5,6,7 are deflector roll.The quantity of steel rider and rubber roll can increase or reduce according to the number of times that pushes in the technology.In addition, can before rolling, increase chill roll in case of necessity, the film after heating and the extruding is cooled off.
Embodiment 1
Symmetry PTFE perforated membrane is pushed between steel rider and rubber roll (hardness 30A), and the surface temperature of steel rider and rubber roll is 20 ℃, and pressure is 68.3N/cm, and speed is 1.3m/min, and the extruding number of times is 10 times.The evaluation result of extrusion process caudacoria is as shown in table 1.
Embodiment 2
Symmetry PTFE perforated membrane is pushed between steel rider and rubber roll (hardness 30A), and the surface temperature of steel rider and rubber roll is 20 ℃, and pressure is 68.3N/cm, and speed is 1.3m/min, and the extruding number of times is 20 times.The evaluation result of extrusion process caudacoria is as shown in table 1.
Embodiment 3
Symmetry PTFE perforated membrane is pushed between steel rider and rubber roll (hardness 48A), and the surface temperature of steel rider and rubber roll is 110 ℃, and pressure is 90.2N/cm, and speed is 0.9m/min, and the extruding number of times is 3 times.The evaluation result of extrusion process caudacoria is as shown in table 1.
Embodiment 4
Symmetry PTFE perforated membrane is pushed between steel rider and rubber roll (hardness 48A), and the surface temperature of steel rider and rubber roll is 110 ℃, and pressure is 90.2N/cm, and speed is 0.9m/min, and the extruding number of times is 5 times.The evaluation result of extrusion process caudacoria is as shown in table 1.
Embodiment 5
Symmetry PTFE perforated membrane is pushed between steel rider and rubber roll (hardness 60A), and the surface temperature of steel rider and rubber roll is 250 ℃, and pressure is 46.3N/cm, and speed is 1.8m/min, and the extruding number of times is 12 times.The evaluation result of extrusion process caudacoria is as shown in table 1.
Embodiment 6
Symmetry PTFE perforated membrane is pushed between steel rider and rubber roll (hardness 60A), and the surface temperature of steel rider and rubber roll is 250 ℃, and pressure is 68.3N/cm, and speed is 1.8m/min, and the extruding number of times is 12 times.The evaluation result of extrusion process caudacoria is as shown in table 1.
Comparative example 1
Symmetry PTFE perforated membrane is pushed between two steel riders, and the surface temperature of two steel riders is 20 ℃, and pressure is 52.5N/cm, and speed is 1.3m/min, and the extruding number of times is 1 time.The evaluation result of extrusion process caudacoria is as shown in table 1.
Comparative example 2
Symmetry PTFE perforated membrane is pushed between two rubber rolls (hardness is 30A), and the surface temperature of two rubber rolls is 20 ℃, and pressure is 68.3N/cm, and speed is 1.3m/min, and the extruding number of times is 10 times.The evaluation result of extrusion process caudacoria is as shown in table 1.
The above-mentioned specific embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Table 1
Claims (2)
1. a method that forms asymmetric polytetrafluoroethylporous porous membrane comprises symmetric polytetrafluoroethylporous porous membrane is carried out repeatedly extrusion process that between steel rider and rubber roll it is characterized in that: the case hardness of described rubber roll is 30～60A; During extrusion process, temperature is 20～250 ℃, and pressure is 46～90N/cm, and speed is 0.9～1.8m/min; The number of times of described extrusion process is 3～20 times.
2. the method for the asymmetric polytetrafluoroethylporous porous membrane of formation according to claim 1, it is characterized in that: the number of times of described extrusion process is 5～20 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100074932A CN103191653A (en) | 2012-01-10 | 2012-01-10 | Method for forming asymmetric polytetrafluoroethylene porous membrane |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100074932A CN103191653A (en) | 2012-01-10 | 2012-01-10 | Method for forming asymmetric polytetrafluoroethylene porous membrane |
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| CN2012100074932A Pending CN103191653A (en) | 2012-01-10 | 2012-01-10 | Method for forming asymmetric polytetrafluoroethylene porous membrane |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017080417A1 (en) * | 2015-11-11 | 2017-05-18 | 重庆润泽医药有限公司 | Polytetrafluoroethylene superfine hollow fiber membrane |
| WO2017080458A1 (en) * | 2015-11-11 | 2017-05-18 | 重庆润泽医药有限公司 | Polytetrafluoroethylene hollow fiber membrane |
| WO2017080473A1 (en) * | 2015-11-11 | 2017-05-18 | 重庆润泽医药有限公司 | Polytetrafluoroethylene ultra-fine fiber membrane |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4248924A (en) * | 1976-09-03 | 1981-02-03 | Sumitomo Electric Industries, Ltd. | Asymmetric porous film materials and process for producing same |
| CN1533882A (en) * | 2003-04-02 | 2004-10-06 | ���˻�˹�����̩�˹ɷ�����˾ | Non symmetrical multihole polytetrafluloethylene membrane for filter |
| CN101091883A (en) * | 2007-04-13 | 2007-12-26 | 宁波大学 | Equipment for manufacturing composite membrane filter of polytetrafluoroethylene |
| CN101961608A (en) * | 2010-10-12 | 2011-02-02 | 浙江理工大学 | Method for controlling aperture of polytetrafluoroethylene hollow fibrous membrane |
| US20110120939A1 (en) * | 2009-11-25 | 2011-05-26 | Kenichi Ishizuka | Crystalline polymer microporous membrane, method for producing the same, and filtration filter |
-
2012
- 2012-01-10 CN CN2012100074932A patent/CN103191653A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4248924A (en) * | 1976-09-03 | 1981-02-03 | Sumitomo Electric Industries, Ltd. | Asymmetric porous film materials and process for producing same |
| CN1533882A (en) * | 2003-04-02 | 2004-10-06 | ���˻�˹�����̩�˹ɷ�����˾ | Non symmetrical multihole polytetrafluloethylene membrane for filter |
| CN101091883A (en) * | 2007-04-13 | 2007-12-26 | 宁波大学 | Equipment for manufacturing composite membrane filter of polytetrafluoroethylene |
| US20110120939A1 (en) * | 2009-11-25 | 2011-05-26 | Kenichi Ishizuka | Crystalline polymer microporous membrane, method for producing the same, and filtration filter |
| CN101961608A (en) * | 2010-10-12 | 2011-02-02 | 浙江理工大学 | Method for controlling aperture of polytetrafluoroethylene hollow fibrous membrane |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017080417A1 (en) * | 2015-11-11 | 2017-05-18 | 重庆润泽医药有限公司 | Polytetrafluoroethylene superfine hollow fiber membrane |
| WO2017080458A1 (en) * | 2015-11-11 | 2017-05-18 | 重庆润泽医药有限公司 | Polytetrafluoroethylene hollow fiber membrane |
| WO2017080473A1 (en) * | 2015-11-11 | 2017-05-18 | 重庆润泽医药有限公司 | Polytetrafluoroethylene ultra-fine fiber membrane |
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Application publication date: 20130710 |