CN106110762A - The material of a kind of high efficiency filter air particle and preparation method - Google Patents
The material of a kind of high efficiency filter air particle and preparation method Download PDFInfo
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- CN106110762A CN106110762A CN201610421885.1A CN201610421885A CN106110762A CN 106110762 A CN106110762 A CN 106110762A CN 201610421885 A CN201610421885 A CN 201610421885A CN 106110762 A CN106110762 A CN 106110762A
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- sandwich
- electret
- parylene
- filter
- electric charge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
- A41D13/1192—Protective face masks, e.g. for surgical use, or for use in foul atmospheres with antimicrobial agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0435—Electret
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- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Filtering Materials (AREA)
Abstract
The present invention relates to material and the preparation method of a kind of high efficiency filter air particle, wherein said material includes with porose matrix skeleton, and the electret with electric charge being arranged in described matrix skeleton.In currently preferred technical scheme, employing Parylene is as electret, and prepares described material by CVD method and follow-up Corona discharge Treatment.The material of filtration air particle provided by the present invention, has the good filter effect to molecule, and this composite has a filtration, and pressure drop is little, good permeability, have light transmission, the characteristic such as frivolous and soft.In preferred technical scheme, to the filter efficiency of PM2.5 up to more than 99%.
Description
Technical field
The present invention relates to a kind of gas filtering material, being combined more particularly, to a kind of effective filtration air particle
Material of structure and preparation method thereof.
Background technology
Along with the development of economic society, the living standard of people significantly improves.But in recent years, people are enjoying
While increasingly abundanter material life, increasingly pay close attention to the negative effect that environment is brought by economic development, and environment
Present situation is to the healthy harm brought of people and coping strategy.Such as, the atmospheric pollution the most increasingly paid close attention to for people,
It it is exactly the great challenge that its own existence environment is brought.
Current China State of Air pollution is the most extremely serious, and in city atmospheric environment, TSP concentration generally surpasses
Mark；This is mainly manifested in, such as oxysulfide (SOx): thermoelectricity, iron and steel, cement etc. are reset the production capacity of clearance industry and maintained all the time
A high position, brings sulfur dioxide (SO2) emissions total amount to steeply rise therewith.In all kinds of emission sources, power plant and Industrial Boiler discharge capacity account for
The overwhelming majority.And for example, Maneuver seeker.Promoted by economic growth, China's motor vehicles quantity rapid development in recent years, especially
It is that some big cities such as vehicles number rate of rise such as Beijing, Shanghai, Guangzhou is significantly larger than average national level especially.Vapour
Nitrogen oxides, carbon monoxide and the hydrocarbon emission total amount of car discharge rise year by year.Owing to urban population is intensive, traffic is transported
Throughput rate is relatively large, and Maneuver seeker proportion in urban atmospheric pollution the most constantly rises.Visible for air pollution
Prophylactico-therapeutic measures be the social problem of common concern.
In the harmful consequences that all kinds of air pollutions are caused, the most clearly, fine particulates, as
PM10, PM2.5 and PM0.3 etc., be both considered as the main cause producing haze, be also to human body by various scientific investigations showed that
The great pellet of health hazard.For this problem, air filting material quickly grows, and has been widely used for mouth
Cover, air cleaning facility, air-conditioning, even screen window etc..
But, for existing air filting material, there is also many deficiencies.Such as, in the mistake realizing filtration
Cheng Zhong, filter efficiency and pressure drop are often two conflicting indexs.To pursue higher filter efficiency, then need to reduce
The aperture of filter material or the thickness of increase filter material, thus cause the pressure drop of filtration to increase.Here it is why people are existing in use
Filtering material (the such as mask of label N95 or N97) time have ventilative poor, the sensation of hypopnea.
Additionally, the preparation of general filtering material is formed by weaving by fibrous material, the diameter of fiber according to material category and
Production technology is unusual at several microns to tens microns, and aperture is relatively big, porosity is the highest, is filtering PM2.5 and PM0.3
Deng inefficient during fine particle.
Additionally, electrostatic spinning quickly grows in recent years, it is possible to obtain a diameter of tens nano-scale fibers arriving hundreds of nanometer.
Such as, Chinese patent literature (calling document 1:CN103191604A in the following text) discloses a kind of sandwich scavenging material and preparation side thereof
Method, it is by carrying out electrospinning to polymer dope, by nanofiber electrospinning to nanometer filter cloth, to form scavenging material.But
Electrostatic spinning technique still suffers from the problems including including yield, productivity, stability etc. in commercial application.Therefore, should
Technology is still more in laboratory stage, the most in the industrial production popularization and application.
It addition, existing filtering material is thicker and light tight.The mask made of this material when wearing and unsightly,
Consumer's Experience is bad, and this is also the reason that quite a few people seeking beauty conflict wears masks；And utilize this light-proof material system
The haze screen window made, also can affect the orthobiosis of people.
Summary of the invention
Therefore, based on problem above, it is an aspect of the invention to provide one and be capable of filtering particulate in air
Sandwich, a kind of effective cross the gas filtration of the PM2.5 even compound structure for new residence of PM0.3 in air filtering
Material, it has, and pressure drop is little, good permeability, the characteristic such as frivolous and soft, is particularly suitable as particulate matter filtering material (such as
The masks such as N95, N97) production material.
Specifically, the first aspect of the invention provides a kind of composite junction being capable of high efficiency filter air particle
Structure material, it is characterised in that described material includes following structure:
With porose matrix skeleton；
The electret with electric charge being arranged in described matrix skeleton.
" efficiently " involved in the present invention filters, and is that those skilled in the art generally may be appreciated efficiency expression side
Formula.Without limitation, " efficiently " alleged in the sandwich filtering air particle of the present invention, refer to for small
The filter efficiency of granule (PM2.5 and/or PM0.3) is more than or equal to 90%, preferably greater than or equal to 95%, or more than or equal to 98%,
More preferably greater than or equal to 99%；In the most preferred technical scheme of the present invention, the composite construction of described filtration air particle
The filter efficiency of PM2.5 be can reach by material or higher than 99.5%, described percentage ratio is with the aerial concentration of molecule
(μg/m3) calculate.
" electret " typically refers to the dielectric material with permanent charge or dipole polarization.In the present invention, inventor
Find, the matrix skeleton of composite deposits equably or is coated with electret, noted by electric charges such as corona discharges subsequently
Entering technology makes it steadily in the long term with electric charge, can greatly promote the filter effect for molecule.
In currently preferred technical scheme, the electret used preferably includes fluorine-containing macromolecular material, or group
Rayleigh；Described electret preferably includes fluorine-containing Parylene and/or Parylene-HT.
It has been investigated that, compare other materials, fluorine-containing macromolecular material (such as Teflon, politef etc.) is being formed
There is charge density high (can reach hundreds of to thousand of microcoulombs every square metre) after electret, and the in relatively slow property that decays
Can, therefore preferably as electret of the present invention.Though without limitation, as the present invention more preferably
Technical scheme, use Parylene, the most fluorine-containing Parylene and/or Parylene-HT as the electret with electric charge.
Parylene (Parylene) is commonly referred to as Parylene and derivant thereof.Parylene material known generally by with
Make magnetic material, printed circuit assembly and components and parts, sensor etc. and need the field of dielectric material, but the present inventor is in surprise
Find, when using Parylene material to be used for air filting material, owing to its preparation condition relaxes easily relatively, depositing homogeneous, and
And carry charge density height and decay slowly, it is particularly suitable for manufacturing the electret with electric charge and the system of the present invention
The standby sandwich filtering air particle.Can be best seen from by explanation in detail below and contrast, use group
The sandwich that air particle is filtered as electret preparation in Rayleigh achieves good effect.
In another preferred technical scheme of the present invention, for the sandwich provided, by vapour deposition work
Material as electret is arranged (deposition) in described matrix skeleton by skill.
The present invention preferably deposits such as fluoro-containing macromolecule material or send auspicious by gas phase deposition technology in matrix skeleton
Woods material is to form electret.Comparing the technology such as existing electrostatic spinning, the present invention is by implementing the material as electret
Gas-phase deposition, it is possible to the scale metaplasia that (the most relatively low temperature) implementation cost is relatively low under the working condition more relaxed
Produce.Primary depositing is capable of several square metres of deposition materials the most large-area, real preferably to meet scale and industry
The demand that border produces.
In another preferred technical scheme of the present invention, wherein the charge density with the electret of electric charge is 10-4000
Microcoulomb every square metre, preferably 1000-3800 microcoulomb every square metre, preferred charge density is 2500-3600 microcoulomb every square
Rice.
As an importance of the present invention, by the material being arranged in matrix skeleton being carried out electric charge injection (example
Such as corona discharge process) so that it is with highdensity electric charge.Owing to being provided with the electret with electric charge, thus not only
Making minute sized hole can directly stop fine particle, the electret coating of electrically charged (such as injecting negative charge) can also be led
Dynamic adsorption particle (particularly can adsorb the granule with such as positive charge), thus be greatly improved to fines thing (such as
PM2.5/PM0.3) filter efficiency.Additionally, inventor also finds, the electric field caused with electric charge the most even can to antibacterial and
Virus plays certain killing action.
In another preferred technical scheme, wherein said matrix skeleton is selected from grenadine, non-woven fabrics, filter cotton or described
High molecule micropore filter membrane；Preferably, described matrix skeleton is selected from non-woven fabrics or filter cotton, forms described high molecule micropore filter membrane
Material is selected from TPO macromolecular material, polyamide-based macromolecular material, polysulfones macromolecular material and/or fluorine-containing high score
Sub-material.
To this, in the sandwich of the present invention, skeleton is at the same time as a supporting layer of whole composite,
It preferably has the performance of light transmission ventilation, and skeleton itself has equally distributed hole or mesh, described hole or the diameter of mesh
Preferably from 0. more than zero micron to hundreds of micron, such as, the equally distributed aperture of 0.01-100 micron (μm)；Preferably,
Described sandwich and/or skeleton have the aperture of 0.05-10 micron (μm)；It is highly preferred that described sandwich
There is the aperture of 0.1-1 micron (μm).Selected skeleton preferably on light transmission ventilation without impact, and can also assist and play stop relatively
The effect of bulky grain thing, protection macromolecular filtering film and the electret deposited.Preferably but not compulsorily, the present invention
Skeleton is selected from grenadine, non-woven fabrics, filter cotton or poly tetrafluoroethylene (PTFE film).
Additionally, also, it is preferred that but without limitation, the present invention also can be selected for high molecule micropore filter membrane as substrate or skeleton.
Without limitation, it may include TPO (such as polyethylene, polrvinyl chloride, polypropylene, polyacrylonitrile), polyamide-based (such as
Nylon 6, nylon), polysulfones (such as polysulfones, polyether sulfone) and fluorine material class (such as Kynoar, politef, fluorine
Change ethylene, propylene).The preparation method of film can use and such as stretch hole forming method, phase inversion, thermic Xiang Fa etc. and can form high score
The method of sub-filter membrane.In the present invention, optionally, in macromolecular filter membrane, the diameter of fiber is between 0.01 micron to 0.5 micron,
And the diameter of macromolecular filter membrane filter opening can reach the scope between 0.01 micron to 5 micron, and preferably at 0.1 micron to 1
Between Wei meter, time in this range, macromolecular filter membrane itself can realize the higher interception rate to fine particle.
In another preferred technical scheme, the present invention also provides for a kind of high efficiency filter air particle that is capable of
Sandwich, wherein said composite includes the Parylene through vapour deposition and Corona discharge Treatment with electric charge
Material.
Although and be described without limitation, but, including the filtration air particles taking charged Parylene material
The composite of thing is one of currently preferred technical scheme.By can in embodiment cited in embodiment in detail below
To find out, Parylene (especially with the Parylene of fluorin radical) is a kind of high density can to possess the carrier of electric charge for a long time,
By Coulomb repulsion, attraction, it is achieved the efficient obstruct to particulate matter, antibacterial and virus the most even can be had certain by highfield
Killing action；The gas-phase deposition simultaneously utilizing Parylene is suitable for carrying out filter composite material the extensive work of low cost
Industry metaplasia is produced.
For materials set forth above of the present invention, another aspect of the present invention is, it is provided that one is prepared as previously discussed
The method of sandwich, it is characterised in that described method comprises the steps:
There is provided with porose matrix skeleton；
Will be suitable for the material as electret deposit equably or be coated in the matrix skeleton that described band is porose；
The described material being adapted as electret is carried out Corona discharge Treatment, so that described material is formed as with electricity
The electret of lotus.
When the present invention selects macromolecular filter membrane as matrix skeleton, preferably by stretching hole forming method, phase inversion, thermic
Phase method forms described high molecule micropore filter membrane.
In the optimal technical scheme that described method is other, described Corona discharge Treatment is implemented by following technological parameter:
The operating frequency of described corona discharge is 10KHz-15KHz, and discharge voltage is 10-15KV, processes time 5-60s.
By the suitable material arranged is carried out Corona discharge Treatment, make electric charge be injected in material to be formed electrically charged
Electret.For the technique of corona discharge, suitable technological parameter can be selected according to suitable material, to manage so that staying
Electret material is with higher charge density.
In the optimal technical scheme that described method is other, the most also include described sandwich is carried out at heat
The step of reason, the temperature of described heat treatment is preferably 300-500 DEG C.
Inventor has surprisingly found that, prepared material is carried out to the heat treatment of heat treatment, such as very short time, it is possible to
In the case of having kept injected charge stable, slow down the die-away time of injected electric charge further.This will more added with
It is beneficial to stablizing of electric charge in composite.
Hereinafter, in conjunction with the drawings and the specific embodiments of the present invention, the present invention will be made more detailed explanation.
Accompanying drawing explanation
Fig. 1 is according to one embodiment of the invention, sweeping after the polypropylene filter bale of cotton is covered with Parylene
Retouch ultramicroscope (SEM) picture；
Fig. 2 and Fig. 3 is the infrared absorption spectrum line chart of obtained material；Fig. 2 is deposition
The infrared absorption spectrum line chart of the material before electret (such as Parylene), Fig. 3 then be deposition electret (such as Parylene) it
After the infrared absorption spectrum line chart of sandwich；
Fig. 4 be the high efficiency filter air particle prepared through embodiment of the present invention sandwich in inject electric charge
The curve chart decayed in time.
Detailed description of the invention
Hereinafter, in order to more clearly the present invention will be described, elaborate several technical schemes and the use of the present invention
Several technical schemes in contrast.But, this part merely illustrates some claimed specific embodiments, its
In technical characteristic described in one or more technical scheme can be combined with arbitrary one or more technical schemes,
The technical scheme that these are combined and obtain, as long as it is without prejudice to the spirit of the present invention, it is also in the application protection domain.
Embodiment 1
Choosing polypropylene and consider cotton as matrix skeleton, average pore size is about 50 microns, and becoming porosity is 80%.By substrate skeleton
Place in vapor deposition chamber together with filter membrane material, all exposed surface vapor deposit one layer 0.1 micron thick " Parylene-
F”.After having deposited, use the high frequency source of 14KHz, under conditions of discharge voltage 12KV, the two sides of composite is distinguished corona
Discharge process 60s, obtains composite construction filtering material.
Especially, in the gas-phase deposition that embodiment 1 is implemented, the equipment used is: Parylene Coater
PDS2010；Material: Parylene-F；Material usage: 0.6g；Evaporating temperature: 175 degrees Celsius；Cracking temperature: 690 degrees Celsius；Pressure
Strong: 12mtor.
The SEM scanning microscope photo of accompanying drawing 1 shows the composite structure that the technical scheme of embodiment 1 is formed, its
Deposited Parylene at polypropylene filter pulp thus obtain composite construction.Due to the size of Parylene the thinnest (0.1 micron), thus
SEM photograph does not embody the pattern of Parylene.
Further, embodiment has carried out infrared absorption spectrum test for the product before and after deposition Parylene technique.By
From the point of view of Fig. 2, test to as if deposition Parylene before the polypropylene filter pulp not carrying out cladding process；From infrared absorption spectrum
From the point of view of absorption peak correspondence, it is possible to confirm the existence of polypropylene filter pulp.
Fig. 3 be then embodiment 1 deposition Parylene technique and corona discharge process terminate after obtained by be combined
The test result of structured filter material.Wherein, the absworption peak that strong absworption peak is C-F key of 1485.97, the absorption at 940.39
Peak belongs to the peak of Isosorbide-5-Nitrae substituted benzene ring, it was demonstrated that Parylene-F material is the most successfully coated on fiber surface.
Embodiment 2
Use commercially available non-woven fabrics as skeleton, average pore size about 100 microns；Porosity 90%；On all exposed surfaces
One layer 0.2 micron thick Parylene HT of gas phase conformal deposit.After having deposited, use the high frequency source of 15KHz at discharge voltage
Under conditions of 15KV, Corona discharge Treatment 30s is distinguished on the two sides to composite, obtains composite construction filtering material, this material
Integral thickness is only 0.5 millimeter.This embodiment uses equipment same as in Example 1, selects Parylene HT, material usage:
2.0g；Evaporating temperature: 120 degrees Celsius；Cracking temperature: 650 degrees Celsius；Pressure: 20mtor.
Embodiment 3
Use filter cotton as substrate (substrate skeleton), one layer of PTFE film (i.e. politef of pressing on one side thereof
Microporous filter membrane), filter membrane thickness is of about 100 microns, and this filter membrane is prepared by stretching pore-forming method, and porosity 90%, aperture is up to several
Ten nanometers；Substrate is placed in vapor deposition chamber together with filter membrane material, micro-in all exposed surface vapor depositions one layer 0.02
The Parylene that rice is thick.After having deposited, use 10KHz high frequency source under conditions of discharge voltage 10KV to composite two
Face Corona discharge Treatment 5s respectively, obtains composite construction filtering material, and the integral thickness of this material is only 0.5 millimeter.This enforcement
Example uses equipment same as in Example 1, selects Parylene material, material usage: 1.0g；Evaporating temperature: 160 degrees Celsius；Split
Solution temperature: 650 degrees Celsius；Pressure: 15mtor.
Embodiment 4
Implement preparation technology same as in Example 1 and prepare corresponding composite construction filtering material.Subsequently, by above-mentioned
The heat treatment that the composite construction filtering material obtained is placed in when carrying out extremely short at 500 DEG C in heating furnace (annealing furnace) is (the warmmest
Process 1-10s).Obtain the composite construction filtering material through Overheating Treatment.
Embodiment 5
Implement preparation technology same as in Example 2 and prepare corresponding composite construction filtering material.Subsequently, by above-mentioned
The heat treatment that the composite construction filtering material obtained is placed in heating furnace when (annealing furnace) carries out extremely short at 400 DEG C is (the warmmest
Process 1-10s).
Embodiment 6
Implement preparation technology same as in Example 3 and prepare corresponding composite construction filtering material.Subsequently, by above-mentioned
The composite construction filtering material obtained is placed in heating furnace and carries out heat treatment (such as heat treatment 1-10s) in short-term at 300 DEG C.
Comparative example 1
Electrostatic spinning process is used to prepare filter composite material.(such as, this is right to use commercially available electrostatic spinning apparatus
Beijing hundred million Lu Da mechanical & electronic equipment corporation, Ltd YLD-11DA type electrostatic spinning apparatus is used) than test；Use and document 1
(CN103191604) similar technological parameter (embodiment 1 of document 1), the PA6/ formic acid spinning liquid of preparation 13%；Subsequently molten
Body spinning temperature is set as 150 DEG C, utilizes mLLDPE and Tissuemat E to carry out spinning as raw material, connects with industrial filter cloth
Receive；Subsequently, described equipment is utilized to carry out spinning for PA6/ formic acid spinning liquid, by the nanofiber electrospinning for preparing to being loaded with
On the filter cloth of mLLDPE fiber.Subsequently the material obtained is dried, and it is carried out hot-forming with glass fibre.Made
The standby material thickness obtained is about 0.35 millimeter.
Comparative example 2
Choose transparent polypropylene and consider cotton for skeleton substrate, all exposed surface vapor deposit one layer 0.1 micron thick
" Parylene-F ".Difference with embodiment 1 is, after having implemented, described composite is not carried out Corona discharge Treatment.
The test of prepared composite and analysis
It follows that carry out the test of performance for composite of the present invention and comparative example material.
A. the test of pollutant filter effect
In this is tested, using commercially available filtrate combined test stand, initial air source is the air of serious pollution,
Controlling a certain amount of gas flow during test, the filter effect for wherein PM2.5 and PM0.3 is tested.Used
In air raw material, initial p M2.5 concentration (the μ g/m recorded3) it is 421.0 μ g/m3, the concentration of PM0.3 is 125.0 μ g/m3.Air
Flow speed control at 65L/min.Table 1 shows the test result of different embodiment.
Table 1: filter effect prepared by different composite material
From the test result of table 1 it can be seen that the composite manufactured according to embodiments of the present invention, there is stable electret
Body covers matrix skeleton, and it has embodied excellent fine particulates filter effect, and wherein the filter effect for PM2.5 is super
Cross or reach 99%；According in the composite filter material that electrostatic spinning technique effect prepares, its filter effect is also preferably below
The present invention.And at the composite filter material as shown in comparative example 2, when not using electrostatic injection technology, material is injected electric charge
Time, under identical testing conditions, then obtain the most undesirable filter effect.
Additionally, by pressure fall-off test data it can be seen that the composite of the present invention is while obtaining high efficiency filter, it is thus achieved that
Less pressure drop.Therefore, the material of the present invention can be at the material as such as domestic gas defecator (such as mask etc.)
Obtain during material and preferably breathe smoothness so that user feels hypopnea or difficulty within bounds.By contrast, by electrostatic
The pressure drop of the filtering material that spining technology obtains is bigger, it was demonstrated that its air is relatively low by smoothness.
B. electrostatic charge keeps test
Fig. 4 shows the quantity of electric charge time history plot of composite as representative of the present invention.As seen from the figure,
The composite after the Technology for Heating Processing process of specific very short time as described in embodiment 4-6, its charge retentivity is bright
Aobvious higher than the filter composite material without heat treatment.Can be clearly seen from chart, material after heat treatment at 300 DEG C
Charge stability the highest.Regardless of whether through Overheating Treatment, the electrostatic charge maintenance dose of composite provided by the present invention is equal
The stable maintenance effect of more than 100 days can be reached.
By contrast, inventor is also thin to existing PP filter membrane (polypropylene filter) and the PP after hydrofluoric acid treatment
The carried charge of film is tested.Prove that existing filtering material stablizes for electric charge that to possess degree the lowest, very through test
To in a short period of time, electric charge all dissipates totally, can not be applicable to make the gas with electret of life-time service
Filtering material.
Although present invention includes specific embodiment, but those skilled in the art is apparent that without departing from
In the case of the spirit and scope of present claims and its equivalent, can these embodiments be made on various forms and details
On change.Embodiment described herein should be considered only in descriptive sense, is not intended to the purpose limited.At each
Feature and the description of aspect in embodiment are deemed applicable to the similar features in other embodiments and aspect.Therefore, this
Bright scope should not be restricted by the restriction of concrete description, but is limited by claim technical scheme, and wants in this right
Within all changes in the range of its equivalent of suing for peace are interpreted to be included in technical scheme.
Claims (10)
1. the sandwich being capable of high efficiency filter air particle, it is characterised in that described material include with
Lower structure:
With porose matrix skeleton；
The electret with electric charge being arranged in described matrix skeleton.
2. sandwich as claimed in claim 1, wherein, described electret includes fluorine-containing macromolecular material, or group
Rayleigh；Described electret preferably includes fluorine-containing Parylene and/or Parylene-HT.
3. the sandwich as described in aforementioned any one claim, wherein will be as electret by gas-phase deposition
Material be arranged in described matrix skeleton.
4. the sandwich as described in aforementioned any one claim, the wherein said electric charge with the electret of electric charge is close
Degree is 10-4000 microcoulomb every square metre, and preferably 1000-3800 microcoulomb every square metre, preferred charge density is 2500-3600
Microcoulomb every square metre.
5. the sandwich as described in aforementioned any one claim, wherein said sandwich has 0.01-100
The equally distributed aperture of micron (μm), it is preferable that described sandwich has the aperture of 0.05-10 micron (μm)；More
Preferably, described sandwich has the aperture of 0.1-1 micron (μm).
6. the sandwich as described in aforementioned any one claim, wherein said matrix skeleton be selected from grenadine, non-woven fabrics,
Filter cotton or described high molecule micropore filter membrane；Preferably, described matrix skeleton is selected from non-woven fabrics or filter cotton, forms described high score
The material of sub-microporous filter membrane selected from TPO macromolecular material, polyamide-based macromolecular material, polysulfones macromolecular material and/
Or fluorine-containing macromolecular material.
7. the sandwich being capable of high efficiency filter air particle, it is characterised in that described composite construction material
Material includes through vapour deposition and follow-up Corona discharge Treatment stably with the Parylene material of electric charge.
8. the method for the sandwich prepared as described in one of any one of claim 1-7, it is characterised in that described
Method comprises the steps:
There is provided with porose matrix skeleton；
Will be suitable for the material as electret deposit equably or be coated in the matrix skeleton that described band is porose；
The described material being adapted as electret is carried out Corona discharge Treatment, so that described material is formed as with electric charge
Electret.
Method the most according to claim 8, wherein said Corona discharge Treatment preferably implemented by following technological parameter: institute
The operating frequency stating corona discharge is 10KHz-15KHz, and discharge voltage is 10-15KV, processes time 5-60s.
The most according to claim 8 or claim 9, method, the most also include carrying out heat treatment for described sandwich
Step, the temperature of described heat treatment is preferably 300-500 DEG C.
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| CN201610421885.1A CN106110762B (en) | 2016-06-13 | 2016-06-13 | A kind of material and preparation method of high efficiency filter air particle |
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| CN201610421885.1A CN106110762B (en) | 2016-06-13 | 2016-06-13 | A kind of material and preparation method of high efficiency filter air particle |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3330986A1 (en) * | 2016-12-05 | 2018-06-06 | Chambre de Commerce et d'Industrie de Région Paris Ile de France (ESIEE Paris) | Compressible fibrous electret structure and electrostatic transducer for kinetic energy harvesting |
| CN108939942A (en) * | 2017-05-19 | 2018-12-07 | 南京理工大学 | A kind of preparation method of composite membrane |
| CN109746120A (en) * | 2017-11-03 | 2019-05-14 | 北京中科艾加科技有限公司 | Filter device including piezo-electricity composite material and its application in absorption Atmospheric particulates |
| WO2020018925A1 (en) * | 2018-07-19 | 2020-01-23 | W.L. Gore & Associates, Inc. | High flow liquid filtration device including a porous polyparaxylylene membrane or a porous polyparaxylylene/polytetrafluoroethylene composite membrane |
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| WO2020018925A1 (en) * | 2018-07-19 | 2020-01-23 | W.L. Gore & Associates, Inc. | High flow liquid filtration device including a porous polyparaxylylene membrane or a porous polyparaxylylene/polytetrafluoroethylene composite membrane |
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