CN1528500A - Method for preparing porous filter membrane of polytetrafluoroethylene electret - Google Patents
Method for preparing porous filter membrane of polytetrafluoroethylene electret Download PDFInfo
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- CN1528500A CN1528500A CNA2003101079277A CN200310107927A CN1528500A CN 1528500 A CN1528500 A CN 1528500A CN A2003101079277 A CNA2003101079277 A CN A2003101079277A CN 200310107927 A CN200310107927 A CN 200310107927A CN 1528500 A CN1528500 A CN 1528500A
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Abstract
The invention relates to a teflon electret multihole filter membrane preparing method, adopting corona or electron beam charging to change permeability of teflon filter membrane, and adjusting voltage (namely needle membrane electric field), charge time, electrifying time and needle membrane distance to change permeability of the filter membrane, so as to realize the filter membrane with different cell sizes and apertures, applied to medium liquid with different grain sized pollutants. It can very effectively purify polluted medium liquids such as gasoline, transformer oil and silicon oil.
Description
Technical field
The invention belongs to ultrapurification engineering (or environmental protection technology) field, be specifically related to a kind of preparation method of polytetrafluoroethylene (PTFE) electret multi-hole filtering film.
Background technology
In recent years, particularly over past ten years, gas or air cleaner with electret nonwoven, electret fiber film and perforated membrane development have been widely used in all kinds of air conditioning and cleaning systems, comprise central air-conditioning and domestic air conditioning, and the microelectronics workshop and the optical engineering workshop that require high accuracy to purify.Compare with traditional mechanical stop type air cleaner or outer offset high-pressure electrostatic filter, they have energy-conservation (low flow resistance, as air-flow resistance only for the mechanical air filter 1/9), need not additional power source system, highfield sterilization and high efficiency of filtration, particularly to the filtration efficiency of the submicron order dust (having carcinogenesis) of serious harm human health as piezoelectric ceramics dust and nicotine etc., make that the development of electret gas and air cleaner is very rapid, and be used widely.Yet this class filtration system is only applicable to the air of polluting is purified.Up to now, utilize the above-mentioned advantage of electret,,, do not see this type of report in the world as yet as the efficient purification of gasoline (in particular for aerospace and other high-tech area), transformer oil and silicone oil etc. to the media fluid that pollutes.
Summary of the invention
The objective of the invention is to propose a kind of preparation method of the polytetrafluoroethylene (PTFE) electret multi-hole filtering film that can efficiently purify to the media fluid that pollutes.
Among the present invention, the preparation process of perforated membrane is: polytetrafluoroethylene film is rolled stretching in 200～300 ℃ of same directions in temperature lower edge so that non-uniform speed is unidirectional, form the porous ptfe film with certain connectedness.Thickness is 30～200 μ m, and slit-shaped apertures length is 1～50 μ m, and stitching wide is 10
-2～2 μ m.
Among the present invention, the preparation process of polytetrafluoroethylstephanoporate stephanoporate filter membrane is:
Perforated membrane placed on the metal electrode flatten, and make it good contact, settle an aciculiform metal electrode above the thin film center position, the needle electrode upper end connects a direct current high voltage source, adopts corona charging to obtain the perforated membrane electret.The corona charging condition is: voltage is ± 5～± 50kV, temperature is 100～300 ℃, and be 1min～1h conduction time, and electrode and film are apart from being 3～50cm.
Among the present invention, corona charging can adopt negative corona charging or positive corona charging, but preferable with the negative corona charging.
Among the present invention, the corona charging electrode is needle-like (comprises single needle or with the spininess of array distribution), or thread, or edge of a knife shape.
Among the present invention, needle-like or thread or edge of a knife shape electrode are the 1-300 roots.
Among the present invention, can adopt the electron beam charging to change the permeability of polytetrafluoroethylstephanoporate stephanoporate filter membrane, ptfe porous membrane is charged through low-energy electron beam, obtain highly connective and improve the perforated membrane electret in aperture, the electron beam charge condition is: electron beam energy=5～100keV, temperature: 100 ℃～300 ℃, the charging interval: 1min～1h.
Corona charging operation principle of the present invention is as follows: utilize an inhomogeneous field that exists between pin-membrane sample to cause the corona discharge of the partial breakdown of air in the air gap under normal pressure, the ion beam of generation reaches the charging purpose with bombardment PTFE porous membrane.
Among the present invention,, can control by aperture plate corona charging in order to obtain in film after overcharging laterally charge density comparatively uniformly; Can be to electron beam charging by the expansion bundle behind the focused beam, or focused beam is realized the scanning of sample.Thereby form perforated membrane electret with good laterally even permeability.This porous electret is applicable to the efficient purification to the media fluid that pollutes.
The present invention is simple in structure, and is novel, can be effectively media fluid to polluting, as the efficient purification of gasoline (in particular for aerospace and other high-tech area), transformer oil and silicone oil etc.
Description of drawings
Fig. 1 is under the different condition, and the PTFE perforated membrane is as the experimental result picture of the relative flow rate of the filter membrane of contaminant water.Wherein, 1 is uncharged porous PTFE, 2 porous PTFEs that just charging for normal temperature, and 3 porous PTFEs for the negative charging of normal temperature, 4 is 200 ℃ of porous PTFEs that just charging, 5 is the porous PTFE of 200 ℃ of negative chargings.
Fig. 2 for a change electric field of corona charging influences figure to the filter membrane permeability.
Fig. 3 for a change temperature influences figure to the filter membrane permeability.
Fig. 4 is the aperture shape appearance figure of uncharged perforated membrane sample.
The aperture shape appearance figure of Fig. 5 for having expanded through 200 ℃ of perforated membrane samples that just charging with Fig. 4 comparison.
The specific embodiment
The invention is further illustrated by the following examples.
Embodiment 1, adopts porous ptfe film, and thickness is 30 μ m, and slit-shaped apertures length is 5 μ m, and stitching wide is 10
-1μ m, adopt corona charging: voltage be ± 15kV, and temperature is 100 ℃, and be 5min conduction time, and electrode and film distance are 10cm, electrode is a needle-like, with 5.
Embodiment 3, adopt porous ptfe film, and thickness is 70 μ m, and slit-shaped apertures length is 35 μ m, stitching wide is 1.5 μ m, adopts corona charging: voltage is ± 30kV, and temperature is 250 ℃, and be 20min conduction time, electrode and film are apart from being 25cm, and electrode is a needle-like, with 280.
Embodiment 4, adopt porous ptfe film, and thickness is 70 μ m, and slit-shaped apertures length is 25 μ m, and stitching wide is 1 μ m, and adopt the electron beam charging: electron beam can be 75keV, and temperature is 250 ℃, and be 2min conduction time.
To above-mentioned PTFE perforated membrane be as the process test result of pollution medium liquid filtering film:
1, under the different disposal condition, the PTFE perforated membrane is as the experimental result (as shown in Figure 1) of the relative flow rate of the filter membrane of contaminant water
1. uncharged sample, the flow rate of water are 0;
2. through normal temperature negative corona charging 30min, present the flow rate of certain water, be assumed to 1;
3. through 200 ℃ of negative chargings through the identical time and to keep other charge parameters constant, compare with above-mentioned normal temperature charging, the relative flow rate of water rises 18 times;
4. just charge through 200 ℃, when other charge condition was identical, the relative flow rate of water was negative charging half (promptly rising 9 times).
At a certain temperature, filter membrane is charged, its relative flow rate improves.
2, charging electric field is to the infiltrative control of perforated membrane
Keep the intermembranous distance of certain pin, regulate corona voltage, change the electric field of corona charging, can effectively regulate the porous permeability of the membrane: as corona voltage V
pFrom-6kV be changed to-during 14kV, the relative flow rate of water increases by 60 times (as shown in Figure 2).
3, charging temperature is to its infiltrative control
With 2 conditions relatively, if charging at 160 ℃, rather than in room temperature, corona voltage V then
pOnly need to be changed to-10kV from-6kV, its relative flow rate has increased by 60 times (curve 2 among Fig. 2); If V
pKeep-6kV, temperature rises to 210 ℃ from room temperature, and its relative flow rate has increased about 22 times (Fig. 2); It is the permeability that charging temperature can effectively improve perforated membrane.
4, charge parameter is to the electret state and the structure root of the improvement of perforated membrane permeability
Because when charging heats up, perforated membrane is deliquescing gradually, and demonstrates bigger elastic elastic compliance, meanwhile, because charging makes and is located at the hole both sides and repelled each other by the Coulomb force of the unipolarity electric charge of charging deposition, thereby causes the expansion of hole; When charging procedure is finished,, can make dilated hole cooling curing if lower the temperature keeping under the corona field condition.Obviously, higher charging temperature may be realized bigger aperture.5～10 times have been expanded as comparing with uncharged sample drawing 4 through the lateral dimension in the hole of 200 ℃ of perforated membranes that just charging among Fig. 5.
Claims (5)
1, a kind of preparation method of polytetrafluoroethylene (PTFE) electret multi-hole filtering film, it is characterized in that the preparation method is: perforated membrane is placed on the metal electrode flatten, above the thin film center position, settle an aciculiform metal electrode, the needle electrode upper end connects a direct current high voltage source, adopt the improved perforated membrane electret of permeability of corona charging, the corona charging condition is: voltage is ± 5～± 50kV, temperature is 100～300 ℃, be 1min～1h conduction time, and electrode and film distance are 3～50cm.
2, the preparation method of polytetrafluoroethylstephanoporate stephanoporate filter membrane according to claim 1 is characterized in that corona charging adopts negative corona or positive corona charging.
3, the preparation method of polytetrafluoroethylstephanoporate stephanoporate filter membrane according to claim 1 is characterized in that the corona charging electrode is a needle-like, or thread, or edge of a knife shape.
4, the preparation method of polytetrafluoroethylstephanoporate stephanoporate filter membrane according to claim 3 is characterized in that needle-like or thread or edge of a knife shape electrode are the 1-300 root.
5, the preparation method of polytetrafluoroethylstephanoporate stephanoporate filter membrane according to claim 1, it is characterized in that adopting the electron beam charging to change the permeability of polytetrafluoroethylstephanoporate stephanoporate filter membrane, obtain the perforated membrane electret, the electron beam charge condition is: electron beam energy=5～100keV, temperature: 100 ℃～300 ℃, the charging interval: 1min～1h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101079277A CN1528500A (en) | 2003-10-16 | 2003-10-16 | Method for preparing porous filter membrane of polytetrafluoroethylene electret |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101079277A CN1528500A (en) | 2003-10-16 | 2003-10-16 | Method for preparing porous filter membrane of polytetrafluoroethylene electret |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435371C (en) * | 2006-03-23 | 2008-11-19 | 同济大学 | Method for preparing porous polymer piezo-electric electret thin film |
| CN100505359C (en) * | 2006-10-12 | 2009-06-24 | 同济大学 | Method for producing controllable microhole structural piezoelectric functional film |
| CN101559255A (en) * | 2009-05-14 | 2009-10-21 | 北京中英联动技术服务有限公司 | Compound electret membrane, preparation method thereof and use thereof |
| CN101786325A (en) * | 2009-01-24 | 2010-07-28 | Afs研发销售有限责任公司 | The method and apparatus that is used for sided corona treatment |
| CN103706260A (en) * | 2012-09-28 | 2014-04-09 | 纳米新能源（唐山）有限责任公司 | Reverse osmosis membrane utilizing piezoelectric polymer, and preparation method thereof |
| CN105771427A (en) * | 2016-04-16 | 2016-07-20 | 青岛锦美盛无纺布有限公司 | Electret non-woven filter material for air filtering |
| CN105854418A (en) * | 2016-05-11 | 2016-08-17 | 安徽元琛环保科技股份有限公司 | Electret filter material and production method thereof |
| CN107123513A (en) * | 2017-06-21 | 2017-09-01 | 重庆大学 | The method for lifting transformer oil clean-up effect |
-
2003
- 2003-10-16 CN CNA2003101079277A patent/CN1528500A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435371C (en) * | 2006-03-23 | 2008-11-19 | 同济大学 | Method for preparing porous polymer piezo-electric electret thin film |
| CN100505359C (en) * | 2006-10-12 | 2009-06-24 | 同济大学 | Method for producing controllable microhole structural piezoelectric functional film |
| CN101786325A (en) * | 2009-01-24 | 2010-07-28 | Afs研发销售有限责任公司 | The method and apparatus that is used for sided corona treatment |
| CN101786325B (en) * | 2009-01-24 | 2013-09-18 | Afs研发销售有限责任公司 | Method and device for corona treatment |
| CN101559255A (en) * | 2009-05-14 | 2009-10-21 | 北京中英联动技术服务有限公司 | Compound electret membrane, preparation method thereof and use thereof |
| CN103706260A (en) * | 2012-09-28 | 2014-04-09 | 纳米新能源（唐山）有限责任公司 | Reverse osmosis membrane utilizing piezoelectric polymer, and preparation method thereof |
| CN103706260B (en) * | 2012-09-28 | 2016-03-02 | 纳米新能源（唐山）有限责任公司 | Reverse osmosis membrane utilizing piezopolymer and preparation method thereof |
| CN105771427A (en) * | 2016-04-16 | 2016-07-20 | 青岛锦美盛无纺布有限公司 | Electret non-woven filter material for air filtering |
| CN105854418A (en) * | 2016-05-11 | 2016-08-17 | 安徽元琛环保科技股份有限公司 | Electret filter material and production method thereof |
| CN107123513A (en) * | 2017-06-21 | 2017-09-01 | 重庆大学 | The method for lifting transformer oil clean-up effect |
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