CN106858823B - A kind of filter layer and mouth mask - Google Patents
A kind of filter layer and mouth mask Download PDFInfo
- Publication number
- CN106858823B CN106858823B CN201710099095.0A CN201710099095A CN106858823B CN 106858823 B CN106858823 B CN 106858823B CN 201710099095 A CN201710099095 A CN 201710099095A CN 106858823 B CN106858823 B CN 106858823B
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- nanofiber
- filter layer
- carrier
- drying
- mouth mask
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/65—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for the sterilisation of air
Abstract
The invention provides a kind of filter layer and mouth mask, it is related to field of new materials.Filter layer is to be combined by nanofiber in a manner of being interspersed in the carrier inside of three-dimensional porous structure.In above-mentioned filter layer, the nanofiber of three-dimensional porous structure is interspersed in carrier combination so that filter layer is while certain porosity is maintained, there is the advantages of resistance is small, filter effect is good.The mouth mask being made using above-mentioned filter layer has the advantages of breathing comfort level is good, strainability is high concurrently.
Description
Technical field
The present invention relates to field of new materials, in particular to a kind of filter layer and mouth mask.
Background technology
With China's rapid development of economy, environmental problem is increasingly severe, especially prominent with haze.According to statistics, China is every
Year, the newly-increased patient populations of lung cancer were up to 700,000 people, and PM2.5 causes the excess mortality rate of population to be up to 0.9 ‰, is traffic accident
Ten times.The disaster-stricken crowd such as haze, PM2.5 is up to 800,000,000 people, and the market capacity of the respiratory protection product of growth-promoting is up to 10,000,000,000 yuan.
The modes such as people's generally use wearing mouth mask alleviate harmful effect caused by all kinds of air pollution on human.Its is hollow
Gas filtering material can prevent particle and pollutant from entering human body, to reducing infringement and prevention disease of the suction particulate matter to health
The propagation of disease has the function that important.It is many to influence the factor of its strainability, such as fiber linear density, and fibre net structure, thickness
Degree and density etc..As protective mask, not only there is higher filter efficiency, also to reduce its respiratory resistance as much as possible, this
It is a pair of contradictory body, and consumer's focus of attention problem.
But existing haze mouth mask often hinders to breathe, blocks capillary, user's red swelling of the skin, pain are caused
Bitterly, the problems such as having difficulty in breathing, and easy breed bacteria is worn for a long time, cause secondary pollution.It is inventor has found that existing
There is material by the way that base material and filtering material are arranged in a layered fashion, to form the mouth mask with laminated construction mostly.But due to
The defects of existing filtering material and existing mouth mask laminated construction, make the structure respiratory resistance of mouth mask larger, and poor filtration effect.
The content of the invention
It is an object of the invention to provide a kind of filter layer and mouth mask, it, which is intended to improve existing mouth mask, can not have filtering effect concurrently
The problem of rate height and small respiratory resistance.
The present invention provides a kind of technical scheme：A kind of filter layer, it is characterised in that including carrier and nanofiber, carrier
With three-dimensional porous structure, the diameter of nanofiber is less than 500 nanometers, and nanofiber is in a manner of being interspersed in three-dimensional porous inside
It is attached to carrier.Carrier and nanofiber are mainly combined by filter layer by dispersion steps and drying steps, dispersion steps
Including the nanofiber solution containing nanofiber being scattered in carrier to obtain disperse system, drying steps are included to disperse system
It is dried.Wherein, nanofiber solution is to be made by nanofiber dispersion in dispersion liquid, dispersion liquid be nanofiber,
The poor solvent of carrier, and the mass concentration of nanofiber is 0.05 ‰~8 ‰ in nanofiber solution.
A kind of mouth mask, it includes above-mentioned filter layer.
The beneficial effect of filter layer and mouth mask provided in an embodiment of the present invention is：Filter layer is to use to have nano-grade size
Nanofiber and be combined with the carrier of three-dimensional porous structure.By the way that carrier is immersed into the Nanowire containing nanofiber
Tie up in solution, nanofiber dispersion is interspersed in the three-dimensional pore space of carrier, then by being dried to obtain filter layer.Nanofiber category
In superfine fibre, by being dispersed in the hole of carrier inside so that form moderate thin in intensive and aperture in filter layer
Small holes, so that while carrier has preferable filter effect, it can also effectively reduce gas and pass through resistance.Using above-mentioned
Filter layer makes mouth mask, can obtain mouth mask and have the advantages of comfort level is good, breathing is smooth, filterability is high concurrently.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is filter layer section structure diagram provided in an embodiment of the present invention；
Fig. 2 is the section structure of the filtering body of existing mouth mask.
Icon：101- nanofibers；102- carriers；201- filtering materials；202- base materials.
Embodiment
, below will be in the embodiment of the present invention to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, it is the conventional production that can be obtained by commercially available purchase
Product.
The filter layer and mouth mask of the embodiment of the present invention are specifically described below.
A kind of filter layer, including carrier and non-woven nanofiber.Wherein, carrier has three-dimensional porous structure；Nanowire
The diameter of dimension is less than 500 nanometers, and nanofiber is to be attached to carrier in a manner of being interspersed in three-dimensional porous inside.
Wherein, nanofiber can have multiple choices, such as nanofiber includes but is not limited to polyacrylonitrile, polychlorostyrene second
It is one or more in alkene, polystyrene, chitosan, chitin, bamboo fibre；Dispersion liquid is water or ethanol.
It is preferred that nanofiber selection Nano chitosan or bamboo fibre.Chitosan, bamboo fibre have natural, harmless excellent
Point, and chitosan and bamboo fibre are degradable, therefore, the problem of in the environment harmful substance will not being caused to remain, be advantageous to
The field that environmental protection grade requires higher uses.Further, chitosan and bamboo fibre have antibiotic effect, can be to common micro- life
Thing plays killing effect, so as to improve the performance of filter layer.
Wherein, carrier can be selected as needed.In the embodiment of the present invention, carrier is non-woven fabrics, filtering sponge or nanometer sea
Any of silk floss or combination.
Because mouth mask is worn for a long time, the microorganism such as easy breed bacteria, can be as needed further to improve added value
Load anti-biotic material.Anti-biotic material can select according to the carrier in filter layer and nanofiber, include organic antibiotic substances and nothing
Machine antibacterial material.Wherein, inorganic antibiotic substances include selected from silver, copper, zinc, titanium nano metal ion and its oxide in one
Kind is a variety of, such as nano-silver ionic.Nano-metal-oxide includes nano titanium oxide.
Wherein, organic antibiotic substances include one in organic quaternary amine, sorbic acid, yellow ginger root alcohol and organic metal
Kind is a variety of, and organic metal includes organotin.
The preparation method of filter layer provided in an embodiment of the present invention is as follows：
Mainly carrier and nanofiber are combined by dispersion steps and drying steps.
S101, dispersion steps
Dispersion steps include the nanofiber solution containing the nanofiber being scattered in carrier to obtain disperse system.
Drying steps include disperse system is dried.
Wherein, nanofiber solution is to be made by nanofiber dispersion in dispersion liquid, and dispersion liquid is nanofiber, carried
The poor solvent of body, and the mass concentration of nanofiber is 0.05 ‰~8 ‰ in nanofiber solution.
It is preferred that in nanofiber solution, the mass concentration of nanofiber is 0.03 ‰~6 ‰, more preferably, Nanowire
The mass concentration of dimension is 0.01 ‰~3 ‰, further, in nanofiber solution, the mass concentration of nanofiber for 3 ‰~
5‰.It is highly preferred that the mass concentration of nanofiber is 5 ‰.
The method that nanofiber solution is scattered in carrier includes immersion method.Further, in other implementations of the present invention
It is that carrier immersion nanofiber solution is obtained into disperse system by the method that nanofiber solution is scattered in carrier in example, it is then right
Disperse system carries out supersonic oscillations.
Further, supersonic oscillations are carried out to disperse system to carry out in shaking table.By combining shaking table and ultrasound
Ripple vibrates, and disperse system is sufficiently shaken, produces violent mixing effect, so as to improve contact of the nanofiber with carrier
Degree, it is more beneficial for nanofiber and is dipped into carrier inside, makes between internal nanofiber and carrier horizontal and vertical more
Dimension is mutually interspersed and intersects.
Nanofiber is due to very high specific surface area and higher surface energy so that nano-particle is easily rolled into a ball
It is poly-.It is to utilize localized hyperthermia caused by ultrasonic cavitation, high pressure, strong shock wave and micro- using ultrasonic wave dispersion of nanofibers
Jet etc., the nanofiber of reunion is opened, nanofiber is dispersed in carrier three-dimensional porous structure.
S102, drying steps
In drying steps, drying the method for disperse system includes：Appointing in stage microwave drying and circulation microwave drying
One kind, wherein, circulation microwave, which is dried, to be included repeating multiple drying programs, and each drying program disperses including microwave drying
System and then immerse nanofiber solution again.
Stage microwave drying：By the carrier for being loaded with nanofiber after microwave drying 5-10min, room temperature is cooled to, so
After continue microwave drying, repeat above step, completed until drying.
Circulation microwave is dried：After carrier is immersed in into nanofiber liquid, to its multiple drying, nanometer is then dipped in again
Fiber liquid, repeatedly dry.The step of repeating above-mentioned drying and immersing nanofiber liquid is multiple.
The temperature for the carrier that microwave drying makes to be loaded with nanofiber with special mode of heating quickly rises in a short time
Height, the body mode of heating of microwave make its drying curve be inversion curve, i.e. thermograde is consistent with moisture evaporation direction, and this is very
The Fast-Balance for being advantageous to drying process is uniformly carried out.And microwave drying improves dry motive force and causes drying time very short,
Be advantageous to nanofiber and keep original characteristic.In addition, microwave drying excites polar molecule not stop with the molecular oscillation of its high speed
Ground changes orientation and produces non-thermal effect, accelerates drying process, makes the filter layer that finally gives the same outside and inside, moisture distribution is equal
It is even.
It is the disperse system obtained by dispersion steps by dry disperse system in this drying steps.For example, it may be it will carry
Body immerses nanofiber liquid and is made or by supersonic oscillations or is being shaken after carrier is immersed into nanofiber liquid
Supersonic oscillations are carried out in bed to be made.
In the present invention, use carrier with three-dimensional porous structure and nanofiber as primary raw material, will both it is compound and
Into obtained filter layer.Wherein, main body of the carrier as filter layer, there is three-dimensional porous structure.It is distributed in the three-dimensional porous of carrier
Arrying main body as superfine fibre, there is provided accommodate the space (such as three-dimensional porous) of nanofiber.It is non-woven to receive in filter layer
Rice fiber is accommodated in carrier, more specifically, nanofiber is three-dimensional porous in carrier with interspersed formal distribution
It is interior.Nanofiber is crisscross in carrier inside, is formed each other and mutually interts, tangles, so as to be securely attached to carrier,
And carrier is kept certain porosity, so that filter layer obtains preferable filter effect, while there can also be breathing
The advantages of resistance is small.
A kind of section structure of typical, filtered layer provided in an embodiment of the present invention can be found in Fig. 1, wherein, nanofiber 101
It is distributed in three-dimensional porous interior in carrier 102.
Based on above-mentioned filter layer, the invention provides a kind of mouth mask containing above-mentioned filter layer.Further, mouth mask may be used also
Selection sets electret fiber layer as needed, to improve the filter effect of mouth mask and the capture rate to harmful substance.Wherein,
Electret fiber layer can be one layer can also multilayer.In some embodiments of the invention, the electret fiber of mouth mask is formed
Set-up mode between layer and filter layer can be to be bonded to each other connection.
Filtering body in existing mouth mask, general arranged in a layered fashion with filtering material using base material are formed, that is, filtered
Material is covered on base material.Using the mouth mask of said structure design, its respiratory resistance is larger, and filter effect is difficult to be changed
It is kind.The section structure of the filtering body of existing mouth mask please participate in Fig. 2, and it has layer structure, wherein, filtering material 201 is with stratiform
Be arranged in the surface of base material 202.
The feature and performance of the present invention are described in further detail with reference to embodiments：
Embodiment 1
A kind of filter layer.Making the method for filter layer includes：Nanofiber of the diameter less than 500 nanometers is dispersed in
The nanofiber solution that nanofiber mass concentration is 0.1 ‰ is obtained in water, above-mentioned nanofiber solution was dispersed in
Filter in sponge, filter layer is obtained by the drying steps of stage microwave drying.In the present embodiment, above-mentioned nanofiber is that bamboo is fine
Dimension.
The preparation method for the filter layer that embodiment 2 is provided to embodiment 11 if not otherwise indicated, is given with embodiment 1
The preparation method flow gone out is identical, and the response parameter of filtering layer manufacturing method thereof and condition are as shown in table 1 in each embodiment.
It should be noted that：
In embodiment 6, carrier is the filtering sponge for being loaded with Nano Silver, and the sponge for being loaded with Nano Silver is immersed in
After nanofiber solution, before microwave drying, also using supersonic oscillations.
In embodiment 7, carrier is the composite of sponge and non-woven fabrics, and the sponge for being loaded with Nano Silver is immersed and received
After rice fiber solution, before microwave drying, also use and supersonic oscillations are carried out in shaking table.
In embodiment 10, carrier is the nanosponges for loading organic quaternary amine.Drying steps are dried for circulation microwave.Specifically
Ground, circulation microwave, which is dried, to be included repeating multiple drying programs, and each drying program includes microwave drying disperse system, Ran Houzai
Immerse nanofiber solution.The nanosponges microwave drying of organic quaternary amine will be loaded, then is dipped in the nanofiber
Solution, then microwave drying is carried out, circulation carries out above-mentioned steps.
In embodiment 11, nanofiber is polystyrene, and carrier is nanosponges.Nano pipe/polyhenylethylene fiber solution disperses
In nanosponges method specifically, nanosponges are immersed into polystyrene solution, supersonic oscillations are carried out in shaking table
10min, microwave drying.Nano pipe/polyhenylethylene fiber solution is again dipped into, supersonic oscillations 10min is carried out in shaking table, then it is micro-
Ripple dries 10min.
The filter layer preparation technology parameter of table 1 and condition
Note, in table 1 ,+represent to contain ,-represent not containing.
Test example one
Experiment purpose：The strainability of filter layer to being provided in 1-11 of the embodiment of the present invention is tested.
Experimental subjects：The filter layer provided by embodiment 1 to 11.
Experimental method：The method provided according to GB2626-2006 is tested.In this test example, 20 DEG C of test temperature,
Detection flows 85L/min, tested media are NaCl particles (>=0.3 μm), test area 100cm2。
Test result such as table 2.
The filter layer strainability test result of table 2
Pass through filter layer test result in table 2, by the addition of layers of nanofibers, mistake provided in an embodiment of the present invention
The filter efficiency of NaCl of the filtering layer to particle diameter below 0.3 μm particle has significant improvement and keeps less resistance.
Under equal test condition, the filter efficiency of sponge is filtered, only reaches 35.1%, and uses the mistake for being internally compounded with nanofiber
Its filter effect of the filter layer of filter sponge making can reach 63.8%, and respiratory resistance is compared to original change for filtering sponge very
It is small.
Test example two
Experiment purpose：The strainability of mouth mask is tested.
Experimental subjects：The filter layer that Example 6 provides and the conventional method system of electret fibrous layer Combined Mining this area
Make the 15 identical mouth masks formed.
The test of filter efficiency, respiratory resistance is carried out to experimental group mouth mask respectively.Method of testing reference GB2626-2006,
After the completion of test, the average value of 15 test results, its result such as table 3 are calculated.
Strainability test result of the mouth mask containing filter layer of table 3 to different sized particles things
| Detection flows (L/min) | 85 | 85 | 85 | 85 | 85 | 85 |
| NaCl particle diameters (μm) | ≧0.3 | ≧0.5 | ≧1.0 | ≧2.0 | ≧5.0 | ≧10.0 |
| Resistance (Pa) | 21.0 | 21.0 | 21.0 | 21.0 | 21.0 | 21.0 |
| Average efficiency (%) | 96.25 | 98.53 | 99.55 | 99.78 | 99.99 | 100 |
By the test result of table 3, containing the mouth mask provided by the invention being combined by filter layer and electret fibrous layer
There is good filter efficiency to different sized particles things.It is high to the filter efficiency of NaCl of the particle diameter below 0.3 μm particle
Up to 96.25%, in addition, the resistance of the mouth mask as little as 21.0Pa.Mouth mask provided by the invention has filter efficiency height, respiratory resistance concurrently
The advantages of small.
Test example three
Experiment purpose：The strainability of mouth mask is tested.
Experimental subjects：It is compound by filter layer and electret fibrous layer, and using this area conventional method be made 11
Group mouth mask.
Commercially buy KN90 classes mouth mask and KN95 class mouth masks.
Wherein, 11 groups of mouth masks correspond to use by above-described embodiment 1 to the filter layer provided in embodiment 11 respectively, such as
First group of mouth mask correspondingly uses the filter layer provided in embodiment 1 to be made.
Experimental method：Method of testing is with reference to GB2626-2006.
Its result is as shown in table 4.
The mouth mask strainability test result of table 4
Compared to existing commercially available KN90 and KN95 mouth masks, 1-11 provided by the invention it can be seen from the data in table 4
Group mouth mask is up to more than 90% to the filter efficiency of particle of the particle diameter more than 0.3 μm, and respiratory resistance is relatively low, and all left in 20Pa
The right side, and the resistance of KN90 and KN95 mouth masks is in more than 100Pa.The present invention, which realizes, takes into account that filter efficiency is high, respiratory resistance is small
Purpose.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in protection scope of the present invention.
Claims (10)
1. a kind of filter layer, it is characterised in that including carrier and nanofiber, the carrier has three-dimensional porous structure, described
The diameter of nanofiber is less than 500 nanometers, and the nanofiber is attached to institute in a manner of being interspersed in the three-dimensional porous inside
State carrier；
The carrier and the nanofiber are mainly combined by the filter layer by dispersion steps and drying steps, described
Dispersion steps include the nanofiber solution containing the nanofiber being scattered in obtain disperse system in the carrier, described
Drying steps include the disperse system is dried；
Wherein, the nanofiber solution is to be made by the nanofiber dispersion in dispersion liquid, and the dispersion liquid is institute
State nanofiber, the poor solvent of the carrier, and the mass concentration of the nanofiber described in the nanofiber solution
For 0.05 ‰~8 ‰.
2. filter layer according to claim 1, it is characterised in that the quality of nanofiber in the nanofiber solution
Concentration is 3 ‰~5 ‰.
3. filter layer according to claim 1, it is characterised in that the nanofiber include polyacrylonitrile, polyvinyl chloride,
It is one or more in polystyrene, chitosan, chitin, bamboo fibre；The dispersion liquid is water or ethanol.
4. the filter layer according to one of claims 1 to 3, it is characterised in that it is described it is carrier loaded have an anti-biotic material, it is described
Anti-biotic material includes organic antibiotic substances and inorganic antibiotic substances, wherein, the inorganic antibiotic substances include selected from silver, copper, zinc,
One or more in the nano metal ion and nano-metal-oxide of titanium, the nano-metal-oxide include nano-silica
Change titanium, the organic antibiotic substances include one kind in organic quaternary amine, sorbic acid, yellow ginger root alcohol and organic metal or
A variety of, the organic metal includes organotin.
5. filter layer according to claim 1, it is characterised in that the carrier is any in non-woven fabrics or nanosponges
Kind or combination.
6. filter layer according to claim 1, it is characterised in that in dispersion steps, by the nanofiber solution point
Dissipate includes in the method in carrier：The carrier is immersed into the nanofiber solution.
7. filter layer according to claim 1, it is characterised in that in dispersion steps, by the nanofiber solution point
Dissipate includes in the method in carrier：The carrier is immersed into the nanofiber solution and obtains disperse system, then directly to described
Disperse system carries out supersonic oscillations, or the disperse system is arranged in shaking table and carries out supersonic oscillations.
8. filter layer according to claim 7, it is characterised in that in the drying steps, drying is shaken by ultrasonic wave
Swing or the method for the disperse system of progress supersonic oscillations includes in shaking table：Stage microwave drying and circulation microwave are dried
Any of, wherein, the circulation microwave, which is dried, to be included repeating multiple drying programs, and each drying program includes
Disperse system described in microwave drying and then the nanofiber solution is immersed again.
9. a kind of mouth mask, it is characterised in that it includes the filter layer as described in claim 1-8 any one.
10. mouth mask according to claim 9, it is characterised in that its described filter layer also includes at least one layer of electret fiber
Layer.
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| CN107497179A (en) * | 2017-09-26 | 2017-12-22 | 昆山盛纺非织造材料研发中心有限公司 | A kind of nano-antibacterial air filtration non-woven material and preparation method thereof |
| CN108273320A (en) * | 2018-02-21 | 2018-07-13 | 赣州安宏环保科技有限公司 | A kind of sponge W even folds manufacturing method and the application of air filtration new material |
| CN111134392A (en) * | 2020-01-14 | 2020-05-12 | 东南大学 | Preparation method of reinforced filter mask |
| US20230105070A1 (en) * | 2020-02-11 | 2023-04-06 | Master Dynamic Limited | Protective mask, air filtration element and air treatment element |
| CN111235871A (en) * | 2020-03-02 | 2020-06-05 | 青岛明月生物医用材料有限公司 | Antiviral filter layer prepared from copper-containing chitosan fiber and application thereof |
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| CN101077473A (en) * | 2007-06-22 | 2007-11-28 | 上海兰度科技有限公司 | Novel environmental protection fiber film material and its preparation method |
| CN101352630A (en) * | 2008-08-29 | 2009-01-28 | 上海兰度科技有限公司 | Multifunctional nano filter medium and preparation method thereof |
| CN103111127B (en) * | 2013-03-01 | 2014-09-03 | 江苏物联网研究发展中心 | PM 2.5 filtration structure and preparation method thereof |
| CN103191604A (en) * | 2013-04-24 | 2013-07-10 | 北京石油化工学院 | Preparation method of firmly-combined sandwich type purification material |
| CN104099784A (en) * | 2014-07-03 | 2014-10-15 | 武汉纺织大学 | Preparation method for high-activity polymer nanofiber material adopting micro-nano pore structure |
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