CN206597379U - Air filter unit based on silk nanofiber - Google Patents
Air filter unit based on silk nanofiber Download PDFInfo
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- CN206597379U CN206597379U CN201620722627.2U CN201620722627U CN206597379U CN 206597379 U CN206597379 U CN 206597379U CN 201620722627 U CN201620722627 U CN 201620722627U CN 206597379 U CN206597379 U CN 206597379U
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- filter unit
- air filter
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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
-
- 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
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
-
- 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
- B01D2239/10—Filtering material manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/10—Multiple layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/08—Animal fibres, e.g. hair, wool, silk
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
Abstract
This is new there is provided a kind of air filter unit based on silk nanofiber, including self-supporting silk layers of nanofibers, in addition to basalis and/or coating, wherein, the base weight of the self-supporting silk layers of nanofibers is 1.7 50g/m2.In the utility model particularly preferred embodiment, the air filter unit is mouth mask, and has the advantages that light and comfortable and filter efficiency are high.
Description
Technical field
The utility model is related to the utilization of silk cocoon silk and silk waste material, in particular to based on silk nanofiber
Air filter unit.
Background technology
In recent years, air pollution especially particulate air pollution (haze) has become a major issue.Haze sky
The particulate matter size disperseed in gas is general at several nanometers to tens microns.Wherein diameter is less than 2.5 microns of particulate matter PM2.5By
It can enter human respiratory in can not directly be intercepted by human body, and compare PM2.5More tiny particulate matter, can enter alveolar, very
Enter other organs to through cell membrane.It is chronically exposed to high concentration PM2.5Or will cause breathing under more fine particle substance environment
The road even disease incidence such as heart increase.According to Chinese environmental air quality standard GB 3095-2012,24 hourly averages
PM2.5Particulate matter two-stage concentration limit value is 75 micrograms/cubic meter.As PM in environment2.5When concentration exceedes the limit value, people should wear
Wear masks and other air filter units are to avoid the harm of particulate matter.In the market is using more extensive air filting material
Fiber filter material, the diameter of fiber is in micro-scaled range, and fiber is generally synthetic polymer fiber and cotton fiber.But
Due to its micron order fibre diameter, there are some defects in existing air filting material, such as (i) is efficient while often
With very big air drag and thick and heavy structure；(ii) PM is contrasted2.5The filter efficiency of more tiny particulate matter is relatively low；(iii)
Lack multi-functional (such as antibiotic property) etc..Therefore, development has that the mankind are friendly, frivolous, ventilative, efficient, multi-functional air
Filtering material is the trend of air filter unit of new generation.
Compared to traditional micrometer fibers, nanofiber has specific surface area big, the features such as high adsorption capacity；In addition, receiving
There is " longitudinal slip effect " in rice fiber, smaller to the resistance of air-flow due to its nanoscale.Now under study for action be used for air filtration
The nanofiber of material mainly includes CNT and some synthetic polymer nanometers prepared using electrostatic spinning technique
Fiber, but these nanofibers are existed that toxicity is uncertain, preparation process is polluted or harmful to environment
Problem.
And silk is a kind of native protein with good characteristic, it is made up of silk gum and fibroin, wherein fibroin is main
Composition, accounts for the 70-80% of silk protein weight.In recent years, the research to fibroin albumen in film field also gradually increased.Such as
A kind of silk-fibroin nano fibrous membrane, using silk as primary raw material, spinning is configured to by series of processes disclosed in prior art
Liquid, fibroin albumen based nano-fiber film is prepared into through electrostatic spinning, is eventually passed alcoholic solution immersion and is obtained finished product, membrane structure is stable
Controllable, good biocompatibility, can be used as biomaterial for medical purpose, but the film-strength obtained is low, and support performance is poor, it is impossible to directly
For air filtration.Such as prior art discloses a kind of silk-fibroin nanofiber air protection product, using silk as raw material, pass through
Electrostatic spinning technique, deposits wire protein fiber film on weaving face fabric, has safeguard function to the air of pollution, but silk-fibroin
Layers of nanofibers is unable to self-supporting, in addition it is also necessary to be compounded on other weaving face fabrics so that filtering material becomes weight, and that wears is comfortable
Property reduction.And for example prior art discloses a kind of nano-filtration membrane, by adding Nano carbon balls or carbon in silk protein liquid
Nanotube, increases film strength.But CNT toxicity is uncertain, long-term use can cause health problem.And generally recognize
For the intensity of silk nanofiber is relatively low, it is difficult to used separately as filtering material, and if individually nano-fiber material is thick
Degree is too big, and as air filting material, gas permeability is not good enough.
Accordingly, it would be desirable to a kind of air filter unit based on fibroin albumen of utility model, its can self-supporting, it is lightweight,
Good permeability, comfortable wearing provides efficient protection to the air of pollution.
Utility model content
The purpose of this utility model is to provide a kind of air filter unit.
In order to achieve the above object, the technical solution adopted in the utility model is as follows, a kind of air filter unit, including：
Optional basalis, self-supporting silk layers of nanofibers, and optional coating, form at least double-layer structure, wherein, it is described
The base weight of self-supporting silk layers of nanofibers is 1.7-50g/m2。
Coating described herein refers to be covered in the structure on self-supporting silk layers of nanofibers, can be by this area
Known various materials are made, such as cotton, gauze, various synthetic fibers clothes, inorganic non-metallic material or metal grill,
Non-woven fabrics or plastics, can also be silk product.
The nanometer nano level diameter of silk fiber causes it to have larger specific surface area, more efficient that particulate matter is caught
Obtain so that in the state of it is independently supported, or the material ventilative with other, such as weaving face fabric, screen window or other filtering materials
With reference to when, can obtain to PM2.5Or more tiny particles content, such as PM0.3, very high mistake efficiency, while having very low air
Resistance, in addition its filter efficiency to particulate matter increase with the increase of envionmental humidity, and under high humidity environment
It is capable of the integrality of holding structure so that it has the advantage applied under higher levels of humidity environment.And functional nano material
Being introduced into for material can introduce multifunctionality into silk nano-fiber air filter equipment.
Preferably, the base weight 10g/m of the self-supporting silk layers of nanofibers2Below so that silk layers of nanofibers
Compare frivolous, comfortable wearing.
Preferably, the base weight of the self-supporting silk layers of nanofibers is 3.4g/m2More than.
Preferably, the base weight of the self-supporting silk layers of nanofibers is 5.4g/m2More than.
Preferably, the base weight of the basalis and/or coating is 20-60g/m2, fibre diameter is micron order.
Preferably, the pressure drop of the air filter unit is less than 120Pa.
Preferably, the pressure drop of the air filter unit is less than 100Pa.
Preferably, the quality factor QF of the air filter unit is more than 0.024, wherein
QF=-ln (1-E)/Δ p (E is filter efficiency, and Δ p is filtration resistance).
Preferably, the quality factor QF of the air filter unit is more than 0.03.
Preferably, the quality factor QF of the air filter unit is more than 0.039.
Preferably, the fibre diameter of the self-supporting silk layers of nanofibers is in the range of 100-800nm.
Preferably, the fibre diameter of the self-supporting silk layers of nanofibers is in the range of 120-780nm.
Preferably, the basalis and coating be integrated it is bag-shaped, self-supporting silk layers of nanofibers can be replaced
Change.
Preferably, self-supporting silk layers of nanofibers by form compound online with reference on the basalis.
Preferably, the filter efficiency of the air filter unit is more than 78.5%, more preferably more than 98.8%.
Preferably, the self-supporting silk layers of nanofibers or basalis or coating include functional materials,
For example, the self-supporting silk layers of nanofibers or basalis or coating include functional materials, such as antiseptic, remove
Formaldehyde materials, radiation proof material, ultraviolet ray-resistant material, skincare material, off-color material, beauty treatment material, coloring agent, preferably pass through leaching
The form addition of stain or microcapsules or function round dot, more preferably described air filter unit also passes through Electrostatic Treatment.
Preferably, the air filter unit is mouth mask, air-conditioning, civilian air purifier or industrial air filtration
Device, the basalis or coating are silk product.
By implementing above-mentioned technical proposal, this is new there is provided a kind of based on the frivolous, ventilative of silk nanofiber, height
Effect, multi-functional air filter unit.
In this is new preferred embodiment, the air filter unit can have advantages below：
(1) biocompatibility is high, and the mankind are friendly, with fine gas permeability, humidity regulation, heat endurance and very strong power
Learn the advantage of intensity and compliance；
(2) the silk layers of nanofibers obtained can self-supporting, weight is small, although and its fibre diameter is small, its
Gas permeability is very good, and overall filter quality is also very good.
(3) silk nanofiber has very big specific surface area, and its filtering material prepared has very high
Filter efficiency；
(4) by adjusting the parameters, Ke Yishi such as operating voltage, operating distance, concentration of dope during electrostatic spinning
Now to the regulation and control of the parameters such as the distribution of silk nanofiber filtration material diameter, thickness, porosity, so as to realize silk nanofiber
Material macro property, such as filter efficiency, pressure drop, the controllable modulation of dust containing capacity parameter.
Term " silk nanofiber " used herein refers to regenerated silk fibroin fiber of the diameter in nanometer (nm) yardstick,
For example diameter can be in the range of 10-1500nm, in the range of particularly 50-1000nm.In some embodiment party of the present utility model
In case, the diameter of the silk nanofiber is in the range of 100-800nm." silk nanofiber " of the present utility model can be adopted
It is made with natural silk or silk offcut as parent material, other modes system known in the art can also be passed through
, its raw material is not limited to natural silk.
Other compositions, such as antiseptic or coloring agent can also be included in " silk nanofiber " of the present utility model.
Term " silk layers of nanofibers " used herein and " silk nano fibrous membrane " can be referred to again with used interchangeably
The fibroplastic non-woven constructions fibrous layer of fibroin protein nano.
Term " self-supporting layers of nanofibers " used herein refers to can be with self-existent silk Nanowire without support
Tie up film.Compared with needing to deposit nanofiber/basalis compound on the base layer, self-supporting layers of nanofibers can be realized
Independent support, mechanical property and machinability are more preferable.
Term " base weight " used herein refers to the quality of the material of unit area size.Base can be used for describing silk again
The thickness of nano fibrous membrane.For example, the base weight of the utility model silk nano fibrous membrane can be less than 10g/m2。
Term " air filter unit " used herein should do the understanding of broad sense, including mouth mask, air-conditioning, civilian air are net
Change device, industrial air cleaner etc..
Term " mouth mask " used herein should do the understanding of broad sense, refer to the air filter unit worn for people.Allusion quotation
The mouth mask of type is such as cotton yarn mouth mask, KN90 mouth masks.
Term " functional materials " used herein refers to the material with specific function, such as Yin Na with antibiotic property
Rice grain.In preferred embodiment of the present utility model, the functional materials can be added to silkworm of the present utility model
In silk nanofiber, to produce extra function.
Term " quality factor " (Qualification Factor, QF) used herein can be used to the different mistakes of comparison
The strainability of filter material material, it considers the filter efficiency and filtration resistance of filtering material, and expression is QF=-ln
(1-E)/Δ p (QF is quality factor, and E is filter efficiency, and Δ p is filtration resistance).Its mistake of the higher filtering material of quality factor
Filter performance better.
Term " optional " (optional) used herein represents the implication of " not essential " or " nonessential ".For example, " appointing
The basalis of choosing " refers to can there is the basalis, can also not have the basalis, this can be by those skilled in the art's root
Selected according to actual conditions.
Brief description of the drawings
Fig. 1 shows the schematic diagram of one embodiment of the utility model.Including coating, self-supporting nanometer
Fibrous layer and basalis.
Fig. 2 is the scanning electron microscope diagram for the silk nano fibrous membrane that the utility model is prepared using electrostatic spinning technique
And optical microscope.
Fig. 3 shows capture of the utility model using the silk nano fibrous membrane of electrostatic spinning technique preparation to particulate matter
Ability.
Fig. 4 is that the utility model utilizes self-supporting silk nano fibrous membrane prepared by electrostatic spinning technique to PM2.5And sub-micro
Scale particles thing (100-400nm) strainability test result, wherein Fig. 4 (a) is that the utility model utilizes electrostatic spinning technique
The self-supporting silk nano fibrous membrane of preparation is to PM2.5Filter efficiency test result；Fig. 4 (b) and Fig. 4 (c) is respectively this practicality
The mistake of self-supporting silk nano fibrous membrane prepared by new utilization electrostatic spinning technique to submicron particles thing (100-400nm)
Filter efficiency and quality factor test result.
Fig. 5 is silk nanofiber/business micrometer fibers filter membrane that the utility model utilizes electrostatic spinning technique to prepare
Composite construction to submicron particles thing (100-400nm) strainability result, wherein Fig. 5 (a) and Fig. 5 (b) are respectively this
The composite construction for silk nanofiber/PP filter clothes that utility model is prepared using electrostatic spinning technique is to submicron particles thing
Filter efficiency and quality factor in (100-400nm) strainability result；Fig. 5 (c) and Fig. 5 (d) is respectively the utility model
The composite construction of the silk nanofiber/glass fibre prepared using electrostatic spinning technique is to submicron particles thing (100-
400nm) the filter efficiency and quality factor in strainability result；Fig. 5 (e) and Fig. 5 (f) are respectively that the utility model utilizes quiet
The composite construction of silk nanofiber/quartz fibre prepared by Electrospinning is to submicron particles thing (100-400nm) mistake
Filter the filter efficiency and quality factor in results of property.
Fig. 6 shows the ultralight spy for the self-supporting silk nano fibrous membrane that the utility model is prepared using electrostatic spinning technique
Property.
Fig. 7 is that the utility model utilizes self-supporting silk nano fibrous membrane prepared by electrostatic spinning technique to PM2.5Filtering
The result that performance changes with ambient humidity, wherein Fig. 7 (a) and Fig. 7 (b) are respectively that the utility model utilizes electrostatic spinning technique system
Standby self-supporting silk nano fibrous membrane is to PM2.5The knot that changes with ambient humidity of filter efficiency, filtration resistance and quality factor
Really.
Fig. 8 is the ring that the utility model utilizes silk nano fibrous membrane prepared by electrostatic spinning technique in relative humidity 95%
Scanning electron microscope diagram after place is placed 9 hours under border.
Fig. 9 is that the utility model prepares silver with the spinning solution of the silver nano-grain containing antibiotic property using electrostatic spinning technique
The transmission electron microscope figure and electron spectrum scanning figure of the silk nanofiber of nano particle doping.
Figure 10 is that the utility model is prepared with the spinning solution of the silver nano-grain containing antibiotic property using electrostatic spinning technique
The anti-microbial property of the silk nanofiber of silver nano-grain doping.
Embodiment
With reference to specific embodiment, the utility model is explained further.
Embodiment 1：Silk nano fibrous membrane is prepared using single needle electrostatic spinning technique for raw material with silk cocoon silk
Silk cocoon is boiled into 30min removing silk gum in 0.5wt% sodium bicarbonate aqueous solutions first, it is then that fibroin albumen is fine
Dimension is in CaCl2/C2H5OH/H2O (mol ratios 1:2:8) 70 DEG C of dissolving 4h in ternary salting liquid system, then by it in deionized water
Middle dialysis obtains silk fibroin water solution in three days, is then freeze-dried to obtain fibroin albumen sponge.By obtained fibroin albumen sea
Silk floss is dissolved in 98-100% anhydrous formic acids and obtains 10wt% fibroin albumen formic acid solutions.Then electrostatic spinning technique, work electricity are utilized
20kV, operating distance 20cm, fibroin albumen formic acid solution injection speed 1ml/h are pressed, electrostatic spinning is carried out, by silk nanofiber
It is deposited on conventional textile/nonwoven fabric (such as silk scarf, cotton yarn, polypropylene PP filter clothes, glass fibre membrane, quartz fibre film, screen window
Deng) on Nano/micron composite filter material or by control the time of electrostatic spinning be available from support silk nano fibrous membrane.
The shape appearance figure of Static Spinning silk fibroin nano-fiber is shown in accompanying drawing 2, the silk nanofiber diameter scope obtained under the conditions of the electrospinning
0.12-0.78 μm, about 0.48 μm of average diameter.By controlling electrostatic spinning sedimentation time, obtained silk nanometer can be controlled
Thickness, base weight and the transparency of tunica fibrosa.Silk nanofiber is used as using transparent conventional screen window screen cloth (glass fibre) as worked as
When accepting substrate, under the conditions of above-mentioned electrospinning, translucence, and electrospinning is presented in silk nano fibrous membrane during electrospinning 5min
The base for the silk nano fibrous membrane that 5min, 10min, 20min are obtained is respectively 1.7g/m again2、3.4g/m2、5.4g/m2, it is respectively less than
10g/m2(see accompanying drawing 6), and can self-supporting, and the base of typical KN90 mouth masks weighs about 200g/m2。
The base weight for the silk nano fibrous membrane that wherein electrospinning 20min is obtained is 5.4g/m2, its can self-supporting, it is and right
PM2.5Filter efficiency up to 98.8%, and pressure drop is only 100pa.PM2.5In protective mask standard, filter efficiency more than 95%
Mouth mask, inspiratory resistance should be less than 150Pa, and expiratory resistance should be less than 120Pa, it is seen then that self-supporting silk of the present utility model
Air filter unit obtained by nano fibrous membrane complies fully with standard, and the other filterings of its base again far smaller than on the market
Product.
Embodiment 2：Self-supporting silk nano fibrous membrane or the silk nanofiber/conventional textile prepared or nonwoven face
Expect composite to PM2.5With the strainability of submicron particles thing
Under the conditions of above-mentioned electrospinning, transparent conventional screen window screen cloth (glass fibre) is used as undertaking substrate, Static Spinning silk
Nanofibres deposit 5min, 10min, 20min can obtain the self-supporting nano fibrous membrane of different base weights, are respectively designated as silk and receive
Rice tunica fibrosa -1#, silk nano fibrous membrane -2#, silk nano fibrous membrane -3#.Silk nano fibrous membrane is to PM2.5Filterability
Accompanying drawing 4 (a) can be seen, silk nano fibrous membrane -3# is to PM2.5Filter efficiency up to 98.8%, but its filtration resistance has compared with it
The glass fibre membrane of suitable filter efficiency is much smaller.Compared with polypropylene PP filter clothes, silk nano fibrous membrane -1# has similar
Filtration resistance, but it is to PM2.5Filter efficiency is much higher, and (efficiency of PP filter clothes is 14.2%, and silk nano fibrous membrane -1#
78.5%) filter efficiency is.Quality factor, it considers the filter efficiency and filtration resistance of filtering material, expression
For QF=-ln (1-E)/Δ p (QF is quality factor, and E is filter efficiency, and Δ p is filtration resistance), comparison is often used to different
The strainability quality of filtering material, its strainability of the higher filtering material of quality factor is better.As can be seen that silk nanometer
The more commercial micrometer fibers film of tunica fibrosa has the higher quality factor.And for 100-400nm submicron particles, silk
Nano fibrous membrane -3# filter efficiency is above 90%, is compared with the glass fibre membrane with suitable filter efficiency, due to its tool
There is less filtration resistance so with the higher quality factor.(see accompanying drawing 4 (b) and 4 (c)) and silk nano fibrous membrane pair
The filter efficiency of particulate matter increases with the increase of envionmental humidity.
Polypropylene PP filter clothes, glass fibre membrane are deposited on when silk nano fibrous membrane, nanometer/micro- is formed on quartz fibre film
During rice composite filter material, composite construction increases to the filter efficiency of particulate matter with the increase of silk nano fibrous membrane deposition
Greatly.Such as accompanying drawing 5 illustrates silk nanofiber/conventional textile or nonwoven fabric composite filter material to 100-400nm sub-micros
The strainability result of scale particles, when depositing minimal amount of silk nanofiber, filter efficiency can have higher increase,
But resistance increase is smaller, therefore quality factor increase.
Embodiment 3：The self-supporting silk nano fibrous membrane prepared is to PM2.5Strainability and fiber morphology are with environment
The change of humidity
Under the conditions of above-mentioned electrospinning, self-supporting silk nano fibrous membrane is obtained, its filter efficiency to PM2.5 is with environment
The increase of relative humidity and significantly increase (see accompanying drawing 7 (a)), corresponding filtration resistance with the increase of relative humidity appropriateness increases
Plus, therefore its quality factor shows slight reduction (see accompanying drawing 7 (b)).For example when relative humidity from 10% increases to 50%
When, silk nano fibrous membrane is to PM2.5Filter efficiency increase to 90.2% from 72.1%, and quality factor reduced by only 2%.
In addition, silk nano fibrous membrane remains to keep the integrality of its structure under high humidity environment, such as silk nano fibrous membrane exists
Placed under 95% relative humidity after being up to 9 hours, its overall structure is remained in that, simply being slightly swelled occurs in fiber.(see
Accompanying drawing 8)
Embodiment 4：The preparation of the silk nano fibrous membrane of silver nano-grain doping and its anti-microbial property
Into 10wt% fibroin albumen formic acid spinning solution, adding a certain amount of silver nitrate (makes silver relative to fibroin albumen
Mass concentration be 10wt%), be stirred continuously, silver nano-grain acted on obtaining the in-situ reducing of silver nitrate using formic acid, and
Fibroin albumen plays stable dispersion effect to the silver nano-grain of generation, finally obtains the fibroin albumen formic acid of silver nano-grain doping
Spinning solution.It is 15kV to adjust electrostatic spinning operating voltage, and operating distance 15cm, spinning solution injection speed 0.6ml/h, electrospinning is obtained
The silk nanofiber of silver nano-grain doping, its transmission electron microscope figure and electron spectrum scanning figure are shown in accompanying drawing 9, silver nanoparticle
About several nanometers of the diameter of particle, and be evenly distributed in silk nanofiber.The silk nano fibrous membrane of silver nano-grain doping
Show good anti-microbial property.Such as using Escherichia coli and staphylococcus aureus as antibacterial experiment bacterium, silver nano-grain doping
Silk nano fibrous membrane around there is obvious antibacterial area, see accompanying drawing 10.
Claims (9)
1. a kind of air filter unit, it is characterised in that including self-supporting silk layers of nanofibers, in addition to basalis and/or
Coating, wherein, the base weight of the self-supporting silk layers of nanofibers is 1.7-50g/m2。
2. the air filter unit described in claim 1, it is characterised in that the base weight of the self-supporting silk layers of nanofibers is
10g/m2Below.
3. the air filter unit described in claim 2, it is characterised in that the base weight of the self-supporting silk layers of nanofibers is
3.4g/m2More than.
4. the air filter unit described in claim 2, it is characterised in that the base weight of the self-supporting silk layers of nanofibers is
5.4g/m2More than.
5. the air filter unit described in claim 1, it is characterised in that the base weight of the basalis or coating is 20-
60g/m2。
6. the air filter unit described in claim 1, it is characterised in that the quality factor QF of the air filter unit is
More than 0.024, wherein QF=-ln (1-E)/Δ p, E are filter efficiency, and Δ p is filtration resistance.
7. the air filter unit described in claim 1, it is characterised in that the fiber of the self-supporting silk layers of nanofibers is straight
Footpath is in the range of 100-800nm.
8. the air filter unit described in claim 1, it is characterised in that the filter efficiency of the air filter unit is
More than 78.5%.
9. the air filter unit described in claim 1, it is characterised in that the air filter unit is mouth mask, air-conditioning, civilian
Air purifier or industrial air cleaner.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510491096 | 2015-08-11 | ||
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108159779A (en) * | 2018-02-10 | 2018-06-15 | 北京清正泰科技术有限公司 | A kind of filtering material and the air filter unit based on the filtering material |
| CN111938230A (en) * | 2020-06-16 | 2020-11-17 | 中国科学院苏州生物医学工程技术研究所 | Respiratory tract transmitted pathogen enrichment spinning membrane, sampling mask paster and sampling mask |
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| CN107441848B (en) * | 2017-08-08 | 2020-04-03 | 华东理工大学 | Silk fibroin nanofiltration membrane with micro-nano structure on surface, preparation method and application thereof |
| CN107373822B (en) * | 2017-09-08 | 2019-03-01 | 重庆库铂科技有限公司 | A kind of protective mask |
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| CN1709618A (en) * | 2005-07-08 | 2005-12-21 | 昆明理工大学 | Method for preparing nano or submicron silver powder |
| WO2009115506A2 (en) * | 2008-03-19 | 2009-09-24 | Basf Se | Metallic nanoparticles stabilised with derivatisied polyethylenimines or polyvinylamines |
| CN101623763B (en) * | 2009-08-03 | 2011-04-06 | 北京印刷学院 | Method for synthesizing nano silver by taking macromolecules as template on surface of film |
| EP3292905A1 (en) * | 2012-01-27 | 2018-03-14 | Zeus Industrial Products, Inc. | Electrospun porous media |
| CN103341209B (en) * | 2013-07-08 | 2015-04-08 | 苏州大学 | Silk fibroin nanofiber membrane and preparation method thereof |
| CN103319731B (en) * | 2013-07-08 | 2015-04-29 | 苏州大学 | Regenerated silk fibroin solution and preparation method thereof |
| CN103628314B (en) * | 2013-10-21 | 2015-11-18 | 广西科技大学 | The preparation method of Nano Silver-protein compound aqueous solution and protein-modified nanometer silver antibiotic textile |
| CN103879120A (en) * | 2014-02-28 | 2014-06-25 | 鑫缘茧丝绸集团股份有限公司 | Fibroin nanofiber haze protection product based on waste cocoon silk raw materials |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108159779A (en) * | 2018-02-10 | 2018-06-15 | 北京清正泰科技术有限公司 | A kind of filtering material and the air filter unit based on the filtering material |
| CN111938230A (en) * | 2020-06-16 | 2020-11-17 | 中国科学院苏州生物医学工程技术研究所 | Respiratory tract transmitted pathogen enrichment spinning membrane, sampling mask paster and sampling mask |
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