CN101073751A - Composite electret filter materials - Google Patents
Composite electret filter materials Download PDFInfo
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- CN101073751A CN101073751A CN 200710067876 CN200710067876A CN101073751A CN 101073751 A CN101073751 A CN 101073751A CN 200710067876 CN200710067876 CN 200710067876 CN 200710067876 A CN200710067876 A CN 200710067876A CN 101073751 A CN101073751 A CN 101073751A
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- electret filter
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Abstract
The invention is concerned with the compound electret filtrating material, it is: compounds the polytetrafluoroethyleme multi-hole-film and the base mode material to get the composite material; process electrets for the composite material. The material of the invention is with higher electret electric charge stability and better filtrating efficiency, the pressure loss is not decrease by the time.
Description
(1) technical field
The invention belongs to ultrapurification engineering field, be specifically related to a kind of composite electret filter materials.
(2) background technology
Along with development of science and technology, more and more stricter to environment requirement, obtain the space of a cleaning, often use air purifier, the filter membrane of clarifier then is an important components in the purification process, its principle of common filter membrane is that the dimension that stops of passive type surpasses the continuation campaign of the big dust of certain size, and makes it to stop.Its effect is relevant with the aperture of filtrate (filter membrane).And common used fabric or common non-woven filtrate, there is dust to infiltrate fabric, form one time dust layer, thereby the realization deep layer is filtered effectively.But along with the growth of service time, its resistance increases, and can't use up to stopping up fabric.Moreover the filter material of conventional filter is made of tiny fiber or porous material, catches powder dust particle by barrier effect.Because airborne most of dust are sub-micron grade particles, mostly they are carcinogen, as the nicotine in the cigarette, quartz and glass fibre, asbestos and all kinds of piezoelectric ceramics submicron order dust in the industrial dust.Traditional filter is wanted these powder dust particles of filtering, needs to adopt the fiber that is in the compacting state, will greatly increase flow resistance like this.And electret air filtering material has numerous advantages, and its development is very rapid, has realized industrialization in the nineties in 20th century.Because its filtrate is charged, can initiatively adsorb dust, particulate, this filtrate has: high arresting efficiency, low pressure loss, big, little, the anti-salt damage that takes up space of dust maintenance dose, a plurality of characteristics such as renewable, more abroad being used.The subject matter that existing electret air filtering material exists is the electric charge instability, makes filter efficiency to be guaranteed, and the multi-functional advantage of dust cleaning and sterilizing can not be not fully exerted.
(3) summary of the invention
Technical problem to be solved by this invention is to provide a kind of charge stable, filter efficiency height, the effective composite electret filter materials of dust cleaning and sterilizing.
Described composite electret filter materials is prepared by following method:
(1) polytetrafluoroethylporous porous membrane and basal lamina material are carried out the compound composite that gets;
(2) composite is annotated the utmost point and get product.
In the composite electret filter materials of the present invention, as the framework material of polytetrafluoroethylporous porous membrane, itself just can be used as filtering material to basal lamina material on the other hand, is used as preposition filter membrane in composite filter material on the one hand, improves the filter efficacy of material.
Further, described basal lamina material is selected from one of the following: polypropylene, polyethylene terephthalate, PEN, polyamide, polyimides, polyacrylonitrile.
Further, described basal lamina material is selected from polypropylene or polyethylene terephthalate.
Further, described basal lamina material is a polypropylene, and polypropylene is got by the nonwoven process preparation.
Further, described basal lamina material is the polyethylene terephthalate.
Further, described polytetrafluoroethylporous porous membrane is the biaxial tension polytetrafluoroethylporous porous membrane.
Further, described biaxial tension polytetrafluoroethylporous porous membrane adopts following step to make: polytetrafluoroethyldispersion dispersion resin is mixed with auxiliary agent, by rolling process mixture is laminated, use machine biaxial tension thin slice again, make polytetrafluoroethylporous porous membrane.
Further, the draft temperature of described preparation polytetrafluoroethylporous porous membrane is 200 ℃～300 ℃.
Further, described step (1) is carried out as follows: polytetrafluoroethylporous porous membrane is covered on the basal lamina material, at the fusion temperature place of basal lamina material hot calendering bonding.
Further, described step (2) adopts corona discharge method or thermoaeization method to annotate the utmost point.
Composite filter material of the present invention increases with the increase initial surface current potential of thickness, with the increase surface-potential stabilization increase of annotating utmost point temperature.Take all factors into consideration the actual industrial production cost, further, the polytetrafluoroethylporous porous membrane thickness of described step (1) is 50～60 μ m; Step (2) adopts corona discharge method or thermoaeization method to annotate the utmost point, and annotating utmost point temperature is 60～120 ℃.
Beneficial effect of the present invention is:
1, high electret charge stability
Porous Teflon itself is exactly fabulous space charge electret, and the boundary layer in the composite construction is effective trap source of catching electric charge, therefore, and by the compound charge storage and the charge stability that can effectively improve filtrate of different materials.Experimental results show that the long term storage at room temperature of electret Compound filtering material and under more extreme condition, (heat or the water logging bubble) the unobvious decline of its electric charge intensity.Therefore, the composite electret filter membrane is except effects such as directly catching of having of general filtering material, inertial deposition, gravity sedimentation and diffusion effect, also increased electret effect (being electrostatic effect), utilize the electret effect of composite, the filter efficiency of material can be improved effectively, thereby the high efficiency filter problem of filter can be solved.
2, surface filtration ability height
Polytetrafluoroethylene (PTFE) has the little characteristics of coefficient of friction, and the porous film surface that makes is smooth, matter is close and porous, and dust can't penetrate filtrate, and the thickness dust all is deposited on film surface.Polytetrafluoroethylene film has played the effect of a dust layer in the composite electret filter membrane filtrate, dust even ultrafine dust all is trapped in the surface of film.Because of this film surface is smooth, splendid chemical stability is arranged again, aging, hydrophobic again makes the dust that is trapped in the surface be easy to peel off.Therefore, the surface filtration that the polytetrafluoroethylstephanoporate stephanoporate filter membrane is carried out is better than in-depth filtration, has solved indeterminable problem in the in-depth filtration.
3, Zhuo Yue filter efficiency
Filter material in the electret filter, the electret porous material that is polarized that adopts, on the direction vertical, exist electrostatic field up to the supreme kilovoltage of hundreds of with air-flow, and usually porous material hole only micron to the sub-micron order of magnitude, thereby formed numerous passive collecting electrode.When the charged corpuscle in the air-flow especially sub-micron grade particle (charged often) passes through these holes, just under the effect of electric field force, be hunted down.Neutral corpuscle in the air-flow becomes dipole because of responding to or polarizing, thereby also can be hunted down effectively.Because electric field force is a long range force, when same filter efficiency, the physical dimension in filter material space can be bigger than the physical dimension of general fibre or porous material, makes the pressure reduction of filter reduce by 20～40 times than traditional filter, reduce flow resistance significantly, can save the energy widely; Bacterium and virus have natural notes utmost point attitude (electronegative) in addition, depend on the dust usually.Electret has inhibition and killing action to common bacterium and virus.Its sterilization dominant mechanism is: the strong electrostatic field and the microelectric current bacterium that are produced by electret make protein variations, and cytoplasm and the cell membrane of damage bacterium destroy the surface texture of bacterium, cause bacterium death.Meanwhile, the highfield of electret formation also has the function of its breeding of obvious suppression to each bacterioid.The manufacturing process of polytetrafluoroethylporous porous membrane can make the aperture be controlled between 0.2 μ m～3 μ m, can hold back the ultrafine dust that calculates with micron quickly and effectively.Do not change porosity behind the deashing, efficiency of dust collection is very high always, at the filtration velocity height and under the thin condition of particle diameter, various polytetrafluoroethylene (PTFE) composite filter materials can both reach the effective filtration more than 99.99%, almost realize zero-emission.Recovery to product is very effective, and also the product of recyclable ultra-fine grain reduces the product loss, also makes discharging reach standard-required.
4, the pressure loss does not increase with the increase of service time
The pressure loss is the same with filter efficiency also to be one of special parameter of weighing by filter, and good filtering material pressure reduction in use is less.The polytetrafluoroethylene (PTFE) composite filter material is when bringing into use, the pressure loss will be higher than common non-woven filtrate, but because polytetrafluoroethylporous porous membrane smooth surface, dewfall not, easy-to-clean ash does not change voidage behind the deashing, therefore after composite filter material puts into operation, the pressure loss does not increase with the prolongation of service time, substantially no longer changes.And common non-woven filtrate ash-removal effect is bad, and with the prolongation of service time, the dust that infiltrates filtrate is more and more, forms very thick dust layer, and the pressure loss is increasing.
5, long service life
Because common non-woven filtrate in use dust is easy to enter filtrate inside, and cumulative, up to the hole is blocked, hardens, filtrate can not re-use.And use polytetrafluoroethylene (PTFE) composite filter material, the dust of filtration to be easy to from the film surface remove, and ash-removal effect is good, the cycle is long, and the deashing intensity of pressure of use is lower, reduced to rub between dust and the filtrate, thus the service life of having improved filtrate.
6, good in economic efficiency
(1) has economic benefit very intuitively.Because use the polytetrafluoroethylene (PTFE) composite filter material, filter efficiency can reach more than 99.99%, greatly reduce the economic loss of bringing because of the discharging that exceeds standard, reusable behind the filtering material product deashing, improved economic benefit.
(2) reduce the consumption of electric energy greatly.Polytetrafluoroethylene (PTFE) composite filter material deashing property is good, the deashing time is short, the deashing required drive is less, cleaning cycle prolongs, save the power cost of deashing, the polytetrafluoroethylene (PTFE) composite filter material is less in the operating period internal pressure loss, and air quantity is handled in available less blower fan power or raising, promptly increases air quantity under low energy consumption.
(3) reduce maintenance cost, reduce labour intensity.
(4) specific embodiment
Below in conjunction with embodiment the present invention is done preferably explanation, but protection scope of the present invention is not limited to this.
The preparation of embodiment 1 polytetrafluoroethyl/ne /ne polypropylene composite electret filter materials
(1) polytetrafluoroethylporous porous membrane is covered on the polypropylene screen, at the fusion temperature place of polypropylene screen hot calendering bonding;
(2) adopt corona discharge method (annotating 60 ℃ of utmost point temperature) that composite is annotated the utmost point and got product.
Wherein polypropylene is got by the nonwoven process preparation.
Described polytetrafluoroethylporous porous membrane is the biaxial tension polytetrafluoroethylporous porous membrane, polytetrafluoroethylporous porous membrane adopts following step to make: polytetrafluoroethyldispersion dispersion resin is mixed with auxiliary agent, by rolling process mixture is laminated, use machine biaxial tension thin slice again, make polytetrafluoroethylporous porous membrane.
The preparation of embodiment 2 polytetrafluoroethyl/ne /ne polypropylene nitrile composite electret filter materials
(1) polytetrafluoroethylporous porous membrane is covered on the polyacrylonitrile film, at the fusion temperature place of polyacrylonitrile film hot calendering bonding;
(2) adopt corona discharge method (annotating 120 ℃ of utmost point temperature) that composite is annotated the utmost point and got product.
Wherein polyacrylonitrile film is got by the nonwoven process preparation.
Described polytetrafluoroethylporous porous membrane is the biaxial tension polytetrafluoroethylporous porous membrane, polytetrafluoroethylporous porous membrane adopts following step to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by rolling process mixture is laminated, use machine biaxial tension thin slice again, make polytetrafluoroethylporous porous membrane.
The preparation of embodiment 3 polytetrafluoroethylene (PTFE)/polyethylene terephthalate's composite electret filter materials
(1) polytetrafluoroethylporous porous membrane is covered on polyethylene terephthalate's film, at the fusion temperature place of polyethylene terephthalate's film hot calendering bonding;
(2) adopt corona discharge method (annotating 90 ℃ of utmost point temperature) that composite is annotated the utmost point and got product.
Wherein the polyethylene terephthalate is got by the nonwoven process preparation.
Described polytetrafluoroethylporous porous membrane is the biaxial tension polytetrafluoroethylporous porous membrane, polytetrafluoroethylporous porous membrane adopts following step to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by rolling process mixture is laminated, use machine biaxial tension thin slice again, make polytetrafluoroethylporous porous membrane.
The preparation of embodiment 4 polytetrafluoroethylene (PTFE)/PEN composite electret filter materials
(1) polytetrafluoroethylporous porous membrane is covered on the poly (ethylene naphthalate) film, at the fusion temperature place of poly (ethylene naphthalate) film hot calendering bonding;
(2) adopt corona discharge method (annotating 90 ℃ of utmost point temperature) that composite is annotated the utmost point and got product.
Wherein poly (ethylene naphthalate) film adopts the nonwoven process preparation and gets.
Described polytetrafluoroethylporous porous membrane is the biaxial tension polytetrafluoroethylporous porous membrane, polytetrafluoroethylporous porous membrane adopts following step to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by rolling process mixture is laminated, use machine biaxial tension thin slice again, make polytetrafluoroethylporous porous membrane.
The preparation of embodiment 5 polytetrafluoroethylene (PTFE)/polyamide composite electret filter materials
(1) polytetrafluoroethylporous porous membrane is covered on the PA membrane, at the fusion temperature place of PA membrane hot calendering bonding;
(2) adopt corona discharge method (annotating 80 ℃ of utmost point temperature) that composite is annotated the utmost point and got product.
Wherein PA membrane adopts the nonwoven process preparation and gets.
Described polytetrafluoroethylporous porous membrane is the biaxial tension polytetrafluoroethylporous porous membrane, polytetrafluoroethylporous porous membrane adopts following step to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by rolling process mixture is laminated, use machine biaxial tension thin slice again, make polytetrafluoroethylporous porous membrane.
The charge stable property testing of comparative example composite electret filter materials and plain polypropylene electret
Embodiment 1～5 make the initial surface current potential of composite filtering film (the polytetrafluoroethylporous porous membrane thickness is 50～60 μ m) normal temperature when annotating the utmost point reach 380V, 30 days rear surface current potentials of normal temperature storage remain on about 150V.Generally about 200V, 10 days only surplus 60～70V of rear surface current potential of normal temperature storage add the heat fade temperature and have only about 50 ℃ the initial surface current potential of plain filter filter material polypropylene (PP) commonly used.Therefore as seen, the electret stability of composite filter material of the present invention obviously is better than polypropylene electret.
Claims (10)
1, a kind of composite electret filter materials is characterized in that by following method preparation:
(1) polytetrafluoroethylporous porous membrane and basal lamina material are carried out the compound composite that gets;
(2) composite is annotated the utmost point and get product.
2, composite electret filter materials as claimed in claim 1 is characterized in that described basal lamina material is selected from one of the following: polypropylene, polyethylene terephthalate, PEN, polyamide, polyimides, polyacrylonitrile.
3, composite electret filter materials as claimed in claim 2 is characterized in that described basal lamina material is selected from polypropylene or polyethylene terephthalate.
4, composite electret filter materials as claimed in claim 3 is characterized in that described basal lamina material is a polypropylene, and polypropylene is got by the nonwoven process preparation.
5, composite electret filter materials as claimed in claim 1 is characterized in that described polytetrafluoroethylporous porous membrane is the biaxial tension polytetrafluoroethylporous porous membrane.
6, composite electret filter materials as claimed in claim 5, it is characterized in that described biaxial tension polytetrafluoroethylporous porous membrane adopts following step to make: polytetrafluoroethyldispersion dispersion resin is mixed with auxiliary agent, by rolling process mixture is laminated, use machine biaxial tension thin slice again, make polytetrafluoroethylporous porous membrane.
7, composite electret filter materials as claimed in claim 6, the draft temperature that it is characterized in that described preparation polytetrafluoroethylporous porous membrane are 200 ℃～300 ℃.
8, composite electret filter materials as claimed in claim 1 is characterized in that described step (1) carries out as follows: polytetrafluoroethylporous porous membrane is covered on the basal lamina material, at the fusion temperature place of basal lamina material hot calendering bonding.
9, composite electret filter materials as claimed in claim 1 is characterized in that described step (2) adopts corona discharge method or thermoaeization method to annotate the utmost point.
10, composite electret filter materials as claimed in claim 9, the polytetrafluoroethylporous porous membrane thickness that it is characterized in that described step (1) are 50～60 μ m; Step (2) adopts corona discharge method to annotate the utmost point, and annotating utmost point temperature is 60 ℃～120 ℃.
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| CN 200710067876 CN101073751A (en) | 2007-04-06 | 2007-04-06 | Composite electret filter materials |
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| CN 200710067876 CN101073751A (en) | 2007-04-06 | 2007-04-06 | Composite electret filter materials |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102068924A (en) * | 2010-12-22 | 2011-05-25 | 中国科学院长春应用化学研究所 | Polytetrafluoroethylene composite membrane and preparation method thereof |
| US8187488B2 (en) | 2010-03-31 | 2012-05-29 | MALAXIT Co. | Electret composite with deep trapping centers on the interphase boundary |
| CN103422253A (en) * | 2013-07-30 | 2013-12-04 | 北京捷朗可控膜技术有限公司 | High-strength polyimide porous membrane including benzimidazole and benzene lateral groups and manufacturing 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 |
| CN106042466A (en) * | 2016-05-19 | 2016-10-26 | 上海驻极新材料科技有限公司 | Superhydrophobic unipolar electret film and preparation method therefor |
| CN107587259A (en) * | 2016-07-06 | 2018-01-16 | 南京理工大学 | A kind of composite electrospun tunica fibrosa of high efficiency filter performance and preparation method thereof |
-
2007
- 2007-04-06 CN CN 200710067876 patent/CN101073751A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8187488B2 (en) | 2010-03-31 | 2012-05-29 | MALAXIT Co. | Electret composite with deep trapping centers on the interphase boundary |
| CN102068924A (en) * | 2010-12-22 | 2011-05-25 | 中国科学院长春应用化学研究所 | Polytetrafluoroethylene composite membrane and preparation method thereof |
| CN102068924B (en) * | 2010-12-22 | 2013-12-18 | 中国科学院长春应用化学研究所 | Polytetrafluoroethylene composite membrane and preparation method thereof |
| CN103422253A (en) * | 2013-07-30 | 2013-12-04 | 北京捷朗可控膜技术有限公司 | High-strength polyimide porous membrane including benzimidazole and benzene lateral groups and manufacturing method thereof |
| CN103422253B (en) * | 2013-07-30 | 2016-06-08 | 北京捷朗可控膜技术有限公司 | A kind of High Strength Polyimide perforated membrane containing benzimidazole and benzene lateral group 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 |
| CN106042466A (en) * | 2016-05-19 | 2016-10-26 | 上海驻极新材料科技有限公司 | Superhydrophobic unipolar electret film and preparation method therefor |
| CN106042466B (en) * | 2016-05-19 | 2019-01-01 | 上海驻极新材料科技有限公司 | A kind of super-hydrophobic unipolarity electret film and preparation method thereof |
| CN107587259A (en) * | 2016-07-06 | 2018-01-16 | 南京理工大学 | A kind of composite electrospun tunica fibrosa of high efficiency filter performance and preparation method thereof |
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