CN100509108C - Composite electret fiber filtering material - Google Patents
Composite electret fiber filtering material Download PDFInfo
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- CN100509108C CN100509108C CNB2007100692676A CN200710069267A CN100509108C CN 100509108 C CN100509108 C CN 100509108C CN B2007100692676 A CNB2007100692676 A CN B2007100692676A CN 200710069267 A CN200710069267 A CN 200710069267A CN 100509108 C CN100509108 C CN 100509108C
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- fiber filtering
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Abstract
The present invention relates to a composite electrets fiber filtering material. The present invention is made by the method as follows:(1) compound the polyfluortetraethylene membrane and the basilar membrane to form a composite material; (2) electret the composite material to form composite electrets membrane; (3) composite electrets membrane forms fiber by extending, and then the product is gained by making the fiber into net. The composite electrets fiber filtering material has the advantages of extremely high electrets electric charge stability, prominent filtering efficiency, low pressure loss, long service life, wide appliance and board service scale.
Description
(1) technical field
The invention belongs to ultrapurification engineering field, be specifically related to a kind of composite electret fiber filtering material.
(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.
Composite electret fiber filtering material of the present invention is got by following method preparation:
(1) poly tetrafluoroethylene and basal lamina material are carried out the compound composite that gets;
(2) composite is annotated the utmost point and obtain compound electret membrane;
(3) compound electret membrane is made fiber through opening the silk stretching, become net promptly to get product.
Preferably, described poly tetrafluoroethylene adopts following method to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by calendering bar is laminated, through the machine simple tension, make poly tetrafluoroethylene again.
Preferably, described polytetrafluoroethylene (PTFE) film thickness is selected from one of following: 30 μ m, 60 μ m, 90 μ m.
Preferably, described basal lamina material is selected from one of following: polypropylene, polyethylene, polyethylene terephthalate.Most preferably, described basal lamina material is selected from polypropylene.
Preferably, described basal lamina material is by extrusion-blown modling or extrude casting technique and make.
Preferably, step (1) adopts following method compound: poly tetrafluoroethylene is covered on the basal lamina material, form composite membrane at the fusion temperature place of basal lamina material hot calendering bonding.
Preferably, step (2) adopts corona discharge method or electrical breakdown polarization method to annotate the utmost point.
Preferably, step (3) product is reinforced into fleece through acupuncture or water jet process again.
Composite electret filter materials of the present invention has following beneficial effect:
1, high electret charge stability
Polytetrafluoroethylene (PTFE) itself is exactly fabulous space charge electret, and the boundary layer in the multi-layer compound structure 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.Experiment has proved the long term storage at room temperature of electret Compound filtering material and under more extreme condition (heating or water logging bubble), its electric charge intensity does not obviously descend.Therefore, MULTILAYER COMPOSITE electret filter film 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, Zhuo Yue filter efficiency
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 the 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 electret state (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.
3, the very low pressure loss
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.General common high-efficiency filtering material, the pressure loss are about 300Pa, and this material pressure loss has only about 15Pa.This material is when bringing into use, and the pressure loss is much smaller than the filtrate of equal efficient.Therefore after material put into operation, the pressure loss increased very slow with the prolongation of service time.And the filter material of equal efficient is with the prolongation of service time, and when the dust of being caught by filtrate was more and more, its micropore blocked very soon, and the pressure loss is increasing.
4, long service life
Generally about 200V, 10 days only surplus 60～70V of rear surface current potential of normal temperature storage are starkly lower than voided polytetrafluoroethylene film and covering material thereof to the initial surface current potential of filter material polypropylene (PP) nonwoven cloth material commonly used.And the initial surface current potential of each sample of composite electret fiber filter membrane is respectively polytetrafluoroethylene (PTFE)/PP film-302V, polytetrafluoroethylene (PTFE)/PET film-247V, steady state value after 40 days is respectively porous Teflon monofilm polytetrafluoroethylene (PTFE)/PP film-130V, polytetrafluoroethylene (PTFE)/PET film-109V, charge stability obviously improves, thereby can guarantee that the composite electret fiber filter membrane that makes has the high efficiency filter performance for a long time, has prolonged the service life of filtrate.
5, be widely used wide adaptability
The composite electret fiber screen pack had both possessed the advantage of composite electret filter membrane, can on purpose design the structure of the composition and the net of fiber according to different filtering objects and environmental condition again.As have a chemical resistance (the many highly corrosive media of ability), against weather and anti-electrical etc.Be not add any material in polytetrafluoroethylene floor, the process mechanical stretching makes under specific condition, does not change its primary characteristic at all.Therefore polytetrafluoroethylene film has above-mentioned characteristic, and the application applicability is very big, is not subjected to the influence of emission gases acid, alkalescence, and temperature can reach 260 ℃.Has adaptability widely than composite electret filter membrane.
(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) poly tetrafluoroethylene and basal lamina material are carried out the compound composite that gets;
(2) composite is annotated the utmost point and obtain compound electret membrane;
(3) compound electret membrane is made fiber through opening the silk stretching, become net promptly to get product.Described poly tetrafluoroethylene adopts following method to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by calendering bar is laminated, through the machine simple tension, make poly tetrafluoroethylene again, the polytetrafluoroethylene (PTFE) film thickness is 60 μ m.
Described basal lamina material is selected from polypropylene, and basal lamina material makes by extrusion-blown modling.
Step (1) adopts following method compound: poly tetrafluoroethylene is covered on the basal lamina material, form composite membrane at the fusion temperature place of basal lamina material hot calendering bonding.Step (2) adopts corona discharge method to annotate the utmost point, annotates the plate positive polarity and selects 25KV, and negative pole is selected 10KV, and annotating the plate distance is 15cm.Step (3) product is reinforced into fleece through needling process again.
The preparation of embodiment 2 polytetrafluoroethylene (PTFE)/polyethylene composite electret filter materials
(1) poly tetrafluoroethylene and basal lamina material are carried out the compound composite that gets;
(2) composite is annotated the utmost point and obtain compound electret membrane;
(3) compound electret membrane is made fiber through opening the silk stretching, become net promptly to get product.
Described poly tetrafluoroethylene adopts following method to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by calendering bar is laminated, through the machine simple tension, make poly tetrafluoroethylene again, the polytetrafluoroethylene (PTFE) film thickness is 60 μ m.
Described basal lamina material is selected from polyethylene, and basal lamina material makes by extrusion-blown modling.
Step (1) adopts following method compound: poly tetrafluoroethylene is covered on the basal lamina material, form composite membrane at the fusion temperature place of basal lamina material hot calendering bonding.Step (2) adopts the electrical breakdown polarization method to annotate the utmost point, annotates the plate positive polarity and selects 20KV, and negative pole is selected 25KV.Step (3) product is reinforced into fleece through needling process again.
The preparation of embodiment 3 polytetrafluoroethylene (PTFE)/polyethylene terephthalate's composite electret filter materials
(1) poly tetrafluoroethylene and basal lamina material are carried out the compound composite that gets;
(2) composite is annotated the utmost point and obtain compound electret membrane;
(3) compound electret membrane is made fiber through opening the silk stretching, become net promptly to get product.
Described poly tetrafluoroethylene adopts following method to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by calendering bar is laminated, through the machine simple tension, make poly tetrafluoroethylene again, the polytetrafluoroethylene (PTFE) film thickness is 90 μ m.
Described basal lamina material is selected from the polyethylene terephthalate, and basal lamina material makes by extrusion-blown modling.Step (1) adopts following method compound: poly tetrafluoroethylene is covered on the basal lamina material, form composite membrane at the fusion temperature place of basal lamina material hot calendering bonding.Step (2) adopts corona discharge method to annotate the utmost point, annotates the plate positive polarity and selects 25KV, and negative pole is selected 10KV, and annotating the plate distance is 15cm.Step (3) product is reinforced into fleece through needling process again.
The preparation of embodiment 4 polytetrafluoroethylene (PTFE)/polyethylene terephthalate's composite electret filter materials
(1) poly tetrafluoroethylene and basal lamina material are carried out the compound composite that gets;
(2) composite is annotated the utmost point and obtain compound electret membrane;
(3) compound electret membrane is made fiber through opening the silk stretching, become net promptly to get product.
Described poly tetrafluoroethylene adopts following method to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by calendering bar is laminated, through the machine simple tension, make poly tetrafluoroethylene again, the polytetrafluoroethylene (PTFE) film thickness is 60 μ m.
Described basal lamina material is selected from the polyethylene terephthalate, and basal lamina material makes by extruding casting technique.
Step (1) adopts following method compound: poly tetrafluoroethylene is covered on the basal lamina material, form composite membrane at the fusion temperature place of basal lamina material hot calendering bonding.Step (2) adopts corona discharge method to annotate the utmost point, annotates the plate positive polarity and selects 25KV, and negative pole is selected 10KV, and annotating the plate distance is 15cm.Step (3) product is reinforced into fleece through needling process again.
Comparative Examples
Adopt the composite electret filter materials that counting method makes embodiment 1-4 and the filter efficiency of plain polypropylene electret filter material to test.Instrument adopts laser particle counter.In the process of the test, each send out the dirt test before and afterwards, carry out count measurement, and calculate the filter efficiency of filter various particle diameter particles, when reaching the condition of termination test, stop test.The typical efficiencies value of filter is that each stage momentary efficiency is according to the weighted average of powder amount in 〉=0.3 μ m particle size range.
| Numbering | Filtering material | Filter efficiency |
| 1 | Embodiment 1 makes composite electret filter materials | 99.999％ |
| 2 | Embodiment 2 makes composite electret filter materials | 99.999％ |
| 3 | Embodiment 3 makes composite electret filter materials | 99.9999％ |
| 4 | Embodiment 4 makes composite electret filter materials | 99.999％ |
| 5 | The plain polypropylene electret filter material | 95％ |
Claims (8)
1, a kind of composite electret fiber filtering material is characterized in that being got by following method preparation:
(1) poly tetrafluoroethylene and basal lamina material are carried out the compound composite that gets;
(2) composite is annotated the utmost point and obtain compound electret membrane;
(3) compound electret membrane is made fiber through opening the silk stretching, become net promptly to get product;
It is one of following that described basal lamina material is selected from: polypropylene, polyethylene, polyethylene terephthalate.
2, composite electret fiber filtering material as claimed in claim 1, it is characterized in that described poly tetrafluoroethylene adopts following method to make: polytetrafluoroethyldispersion dispersion resin is mixed with liquid adjuvants, by calendering bar is laminated, through the machine simple tension, make poly tetrafluoroethylene again.
3, composite electret fiber filtering material as claimed in claim 2, it is one of following to it is characterized in that described polytetrafluoroethylene (PTFE) film thickness is selected from: 30 μ m, 60 μ m, 90 μ m.
4, composite electret fiber filtering material as claimed in claim 1 is characterized in that described basal lamina material is selected from polypropylene.
5, composite electret fiber filtering material as claimed in claim 1 is characterized in that described basal lamina material is by extrusion-blown modling or extrude casting technique and make.
6, composite electret fiber filtering material as claimed in claim 1 is characterized in that step (1) adopts following method compound: poly tetrafluoroethylene is covered on the basal lamina material, form composite membrane at the fusion temperature place of basal lamina material hot calendering bonding.
7, composite electret fiber filtering material as claimed in claim 1 is characterized in that step (2) adopts corona discharge method or electrical breakdown polarization method to annotate the utmost point.
8, composite electret fiber filtering material as claimed in claim 1 is characterized in that step (3) product reinforces into fleece through acupuncture or water jet process again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100692676A CN100509108C (en) | 2007-06-12 | 2007-06-12 | Composite electret fiber filtering material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100692676A CN100509108C (en) | 2007-06-12 | 2007-06-12 | Composite electret fiber filtering material |
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| CN101125266A CN101125266A (en) | 2008-02-20 |
| CN100509108C true CN100509108C (en) | 2009-07-08 |
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| CNB2007100692676A Active CN100509108C (en) | 2007-06-12 | 2007-06-12 | Composite electret fiber filtering material |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381516A (en) * | 2011-10-30 | 2012-03-21 | 徐国元 | Electret preservative film and preservative bag |
| US20140263033A1 (en) * | 2013-03-13 | 2014-09-18 | 2266170 Ontario Inc. | Process For Forming A Three-Dimensional Non-Woven Structure |
| CN105771427B (en) * | 2016-04-16 | 2018-05-15 | 青岛锦美盛无纺布有限公司 | A kind of air filtration non-woven electret filtering material |
| CN105944455B (en) * | 2016-06-22 | 2018-01-19 | 东华大学 | A kind of multilayer containing energization auxiliary agent spins molten electret filtering material and preparation method thereof |
| CN108126409A (en) * | 2018-01-12 | 2018-06-08 | 黑珀（上海）工业技术有限公司 | A kind of novel PGO diesel oil overlay film back-flushing filtering system and its filter method |
| CN109602786A (en) * | 2019-01-03 | 2019-04-12 | 广东泰宝医疗科技股份有限公司 | A kind of ion induction woman's health patch and preparation method thereof |
| CN112442794A (en) * | 2020-09-30 | 2021-03-05 | 漳州怡鹭祥康医疗器械有限公司 | Melt-blown fabric intelligent production system and production method |
| CN115678360B (en) * | 2022-12-29 | 2023-05-09 | 杭州兆华电子股份有限公司 | Preparation method of composite electret and composite electret obtained by preparation method |
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Effective date of registration: 20210128 Address after: 314511 north side of Century Avenue, Tongxiang Development Zone, Tongxiang, Jiaxing, China Patentee after: TONGXIANG JIANMIN FILTER MATERIALS Co.,Ltd. Address before: 314511 Zhejiang Province, Tongxiang City Development Zone century Chongfu Road North Patentee before: TONGXIANG JIANMIN FILTER MATERIALS Co.,Ltd. Patentee before: ZHEJIANG University OF SCIENCE AND TECHNOLOGY |