CN109758838A - A kind of reusable air purifying filter mesh of antibacterial and preparation method thereof - Google Patents
A kind of reusable air purifying filter mesh of antibacterial and preparation method thereof Download PDFInfo
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- CN109758838A CN109758838A CN201910049699.3A CN201910049699A CN109758838A CN 109758838 A CN109758838 A CN 109758838A CN 201910049699 A CN201910049699 A CN 201910049699A CN 109758838 A CN109758838 A CN 109758838A
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- air purifying
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- purifying filter
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- filter mesh
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Abstract
The present invention relates to reusable air purifying filter meshs of a kind of antibacterial and preparation method thereof, the air purifying filter mesh, including non-woven fibre supporting layer, filter layer, antibiotic layer and coating, successively hot pressing is compound from the bottom up for the non-woven fibre supporting layer, filter layer, antibiotic layer and coating；The filter layer includes PTFE filter membrane, and the antibiotic layer includes chitosan anti-bacteria nano fibrous membrane.The chitosan as used by the antibiotic layer in air purifying filter mesh of the invention is the deacetylated product of chitin, it is a kind of natural boiomacromolecule linear polysaccharide, it is the rare positively charged high molecular polymer of nature, therefore, it can prevent the microorganism mass propagation being adsorbed on air purifying filter mesh and cause secondary pollution, simultaneously, the air purifying filter mesh can be cleaned with detergent or washing powder water and performance does not have a bit decline, to thoroughly solve since traditional strainer adsorbs indoor secondary pollution problem caused by dust or bacteria breed for a long time.
Description
Technical field
The present invention relates to technical field of air purification, more particularly to a kind of reusable air purifying filter mesh of antibacterial
And preparation method thereof.
Background technique
With the development of modern industry, air quality decline the problem of it is more and more prominent, for guarantee room air quality,
The air filtration purification product that a variety of specific aims are administered, including electrostatic adsorption type, physical mechanical mistake have been produced on the market
Filter type, wherein the purification strainer of mechanical filter type is the core component in air clearing product.However, existing purification strainer exists
During prolonged use, a large amount of dust or bacterium have been adsorbed thereon, and material as used by it is not have generally
PP melt blown non-woven or PP needle thorn electret nonwoven fabric etc. of antibiotic property so that the dust of its absorption or bacterium mass propagation from
And the secondary pollution of room air is caused, and the service life of PP melt blown non-woven or PP needle thorn electret nonwoven fabric is shorter, shadow
Ring the using effect of consumer.
Summary of the invention
The present invention is to overcome the shortcomings of described in the above-mentioned prior art, provides a kind of reusable air cleaning filter of antibacterial
Net and preparation method thereof.
In order to solve the above technical problems, technical scheme is as follows:
A kind of reusable air purifying filter mesh of antibacterial, including non-woven fibre supporting layer, filter layer, antibiotic layer and covering
Layer, successively hot pressing is compound from the bottom up for the non-woven fibre supporting layer, filter layer, antibiotic layer and coating；The filter layer
Including PTFE filter membrane, the antibiotic layer includes chitosan anti-bacteria nano fibrous membrane.
Further, as optimal technical scheme, the aperture of the PTFE filter membrane is 0.18 μm -0.22 μm.
Further, as optimal technical scheme, the porosity of the PTFE filter membrane is more than or equal to 89%.
Further, as optimal technical scheme, the chitosan anti-bacteria nano fibrous membrane includes the shell that mass ratio is 3:1
Glycan and PEO and mass fraction are greater than the acetic acid of 85Wt%.
Further, as optimal technical scheme, the material of the non-woven fibre supporting layer is PET spun-bonded non-woven fabrics or glass
Glass fiber nonwoven fabric.
Further, as optimal technical scheme, the material of the coating is PP nonwoven fabric or cotton nonwoven fabric.
A kind of preparation method of the reusable air purifying filter mesh of antibacterial, includes the following steps:
The preparation of PTFE filter membrane: by after drying PTFE powder and polar organic solution mixed and squeezed out PTFE item,
PTFE item is rolled into PTFE membrane, and PTFE membrane is heated, stretch, be formed, cut and is wound, obtains PTFE filtering
Film；
The preparation of chitosan anti-bacteria nano fibrous membrane: mass ratio is chosen as chitosan and PEO, the mass fraction of 3:1 and is greater than 85Wt%
Acetic acid be configured to mass fraction be 3wt%-5wt% spinning solution, spinning solution is subjected to heating stirring, is obtained transparent
Cement solution left standstill deaeration electrostatic spinning is obtained chitosan anti-bacteria nano fibrous membrane by cement solution；
Non-woven fibre supporting layer, PTFE filter membrane, chitosan anti-bacteria nano fibrous membrane and coating are taken, successively will from inside to outside
Non-woven fibre supporting layer, PTFE filter membrane, chitosan anti-bacteria nano fibrous membrane and coating hot pressing are compound, and it is repeatable that antibacterial is made
The air purifying filter mesh used.
Further, as optimal technical scheme, the mass fraction of the spinning solution is 3.5 wt%-4.5wt%.
Further, as optimal technical scheme, the parameter of the electrostatic spinning are as follows: voltage be 18 ~ 25 kV, receive away from
From pushing away for 8-15 cm, note, rate is 0.1-0.3 mm/min, substrate conveying speed is 0-5m/min, Nozzle At The Ingot Mold group movement speed
For 0-150mm/s.
Further, in the preparation process of chitosan anti-bacteria nano fibrous membrane, spinning is molten as optimal technical scheme
The heating temperature that liquid carries out heating stirring is 35-45 DEG C, mixing time 8-12h.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
The chitosan as used by the antibiotic layer in air purifying filter mesh of the invention is the deacetylated product of chitin,
It is a kind of natural boiomacromolecule linear polysaccharide, is the rare positively charged high molecular polymer of nature, it therefore, can be with
It prevents from being adsorbed on the microorganism mass propagation on air purifying filter mesh and causes secondary pollution, meanwhile, used by filter layer
The aperture of PTFE filter membrane can be controlled in 0.18-0.22 μm, and porosity has filter efficiency height, can prevent Asia up to 89% or more
The characteristics of particulate matter of micron level penetrates, finally, air purifying filter mesh of the invention can be clear with detergent or washing powder water
It washes and performance does not have a bit decline, to achieve the effect that reuse, and PTFE filter membrane remains to protect after multiple washing
The filter efficiency for holding 80% or more substantially reduces the cost of consumer, also thoroughly solves since traditional strainer adsorbs ash for a long time
Indoor secondary pollution problem caused by dirt or bacteria breed.
Detailed description of the invention
Fig. 1 is the quiet and deserted purification filter structure schematic diagram of the present invention.
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable；The same or similar label corresponds to same or similar
Component；The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention are more
It is easily readily appreciated by one skilled in the art, to make apparent define to protection scope of the present invention.
Embodiment 1
A kind of reusable air purifying filter mesh of antibacterial includes non-woven fibre supporting layer 1, filter layer 2, resists as shown in Figure 1:
Bacterium layer 3 and coating 4, successively hot pressing is multiple from the bottom up for non-woven fibre supporting layer 1, filter layer 2, antibiotic layer 3 and coating 4
It closes；Filter layer 2 includes PTFE filter membrane, and antibiotic layer 3 includes chitosan anti-bacteria nano fibrous membrane.
In the present invention, the aperture of PTFE filter membrane is 0.18 μm -0.22 μm, it is preferred that the aperture of PTFE filter membrane is
0.20 μm, the porosity of PTFE filter membrane is more than or equal to 89%, when Particulate Pollution object passes through PTFE filter membrane, partial size ratio
The small particle in the aperture of PTFE filter membrane passes through PTFE filter membrane；The preferential quilt of the big particle in the aperture of partial size ratio PTFE filter membrane
PTFE filter membrane intercepts, and plays the role of obstructing particulate matter, to make have filter using the air purifying filter mesh of PTFE filter membrane
It is high-efficient, can prevent the other particulate matter of submicron order from penetrating.Meanwhile using the air purifying filter mesh of the PTFE filter membrane have can
The effect reused is washed, PTFE filter membrane is still able to maintain 80% or more filter efficiency after multiple washing, substantially reduces and disappear
The cost of the person of expense.
Chitosan anti-bacteria nano fibrous membrane includes that the chitosan that mass ratio is 3:1 and PEO and mass fraction are greater than 85Wt%
Acetic acid, it is preferred that the mass fraction of acetic acid be 90Wt%.It is a kind of due to the deacetylated product that chitosan is chitin
Natural boiomacromolecule linear polysaccharide, is the rare positively charged high molecular polymer of nature, the sun of chitosan band from
With the sialic acid or Phospholipids anion for constituting biological cell wall ions binding occurs for son, has fettered the freedom degree of microorganism, hinders
Hinder its development, reaches antibacterial effect.So the chitosan anti-bacteria nano fibrous membrane being applied in air purifying filter mesh can prevent
The microorganism mass propagation that is adsorbed on air purifying filter mesh and cause secondary pollution.
The material of non-woven fibre supporting layer 1 is PET spun-bonded non-woven fabrics or glass fibre nonwoven fabric, it is preferred that non-woven fibre
The material of supporting layer 1 is PET spun-bonded non-woven fabrics, and the specification of the PET spun-bonded non-woven fabrics is grammes per square metre 100g/m2；The material of coating 4
For PP nonwoven fabric or cotton nonwoven fabric, it is preferred that the material of coating 4 is PP nonwoven fabric, which is surfacing, rule
Lattice are 20 ~ 40 g/m2 of grammes per square metre.
Embodiment 2
A kind of preparation method of the reusable air purifying filter mesh of antibacterial, includes the following steps:
The preparation of PTFE filter membrane: by after drying PTFE powder and polar organic solution mixed and squeezed out PTFE item,
PTFE item is rolled into PTFE membrane, and PTFE membrane is heated, stretch, be formed, cut and is wound, obtains PTFE filtering
Film.
The preparation specific steps of PTFE filter membrane are as follows: PTFE fine powder material is sufficiently dry in an oven, the PTFE after drying
Powder enters in extruder after being sufficiently mixed with polar organic solution to be squeezed, so that PTFE item is squeezed out, then under roller press
PTFE item is rolled into diaphragm, heating volatilization is vertically and horizontally stretched after removing polar organic solution, then is passed through heat treatment shaping, cut
It cuts and winds to obtain the PTFE filter membrane of biaxial tension.The aperture of the PTFE filter membrane prepared is 0.18 μm -0.22 μm, preferably
, the aperture of PTFE filter membrane is 0.20 μm, and the porosity of PTFE filter membrane is more than or equal to 89%.Wherein, polar organic solution packet
Include chloroform, acetone or N dimethyl acetamide etc..
The PTFE filter membrane has the effect of washable reuse, and 80% or more mistake is still able to maintain after multiple washing
Efficiency is filtered, the cost of consumer is substantially reduced.
The preparation of chitosan anti-bacteria nano fibrous membrane: it chooses mass ratio and is greater than for the chitosan and PEO, mass fraction of 3:1
The acetic acid of 85Wt%, using chitosan and PEO as solute, it is molten that acetic acid is that solution is configured to the spinning that mass fraction is 3wt%-5wt%
Spinning solution is carried out heating stirring by liquid, obtains transparent cement solution, and cement solution left standstill deaeration electrostatic spinning obtains
Chitosan anti-bacteria nano fibrous membrane.Wherein, heating temperature is 35-45 DEG C, is stirred as magnetic agitation, mixing time 8-12h；It is excellent
Choosing, the mass fraction of acetic acid is 90Wt%, and the mass fraction of spinning solution is 3.5 wt%-4.5wt%, it is preferred that spinning solution
Mass fraction be 4wt%, heating temperature be 40 DEG C.
The parameter of electrostatic spinning are as follows: it be 8-15 cm that voltage, which is 18 ~ 25 kV, receives distance, infuses that push away rate be 0.1-0.3
Mm/min, substrate conveying speed are 0-5m/min, and Nozzle At The Ingot Mold group movement speed is 0-150mm/s.
It in this step, is a kind of natural boiomacromolecule due to the deacetylated product that chitosan is chitin
Linear polysaccharide is the rare positively charged high molecular polymer of nature, cation and the composition biological cell of chitosan band
Ions binding occurs for the sialic acid or Phospholipids anion of wall, has fettered the freedom degree of microorganism, has hindered its development, to change
It microbial cell film penetrating and then destroys cell membrane, causes microbial cell dead and reach antibacterial effect, meanwhile,
Suitable PEO(polyoxyethylene is added in chitosan) it is greatly improved the spinnability of chitosan, to reach chitosan anti-bacteria nanometer
The preparation requirement of tunica fibrosa.So the chitosan anti-bacteria nano fibrous membrane being applied in air purifying filter mesh can prevent from being adsorbed on
Microorganism mass propagation on air purifying filter mesh and cause secondary pollution.
Taking the PET spun-bonded non-woven fabrics that grammes per square metre is 100g/m2 is non-woven fibre supporting layer 1, PTFE filter membrane, chitosan anti-bacteria
The PP nonwoven fabric that nano fibrous membrane and grammes per square metre are 20 ~ 40 g/m2 is coating 4, from inside to outside successively by PET spunbond nonwoven
Cloth, PTFE filter membrane, chitosan anti-bacteria nano fibrous membrane and PP nonwoven fabric hot pressing are compound, and the reusable air of antibacterial is made
Purify strainer.
In the present embodiment, washing filtering experiment test is carried out to PTFE filter membrane, it is " medical with reference to GB 19083-2003
Protective mask technical requirements " in antibacterial biological protective mask to the filter efficiency of particulate matter and the test method of gas-flow resistance.
Test device uses U.S. TSI8130 filtrate tester, and tested media is that the NaCl gas that grain diameter intermediate value is 0.28 um is molten
Glue, 2wt%NaCl solution test 32 L min-1 of flow, pleating 50.Cleaning way: tap water adds cleaning solution, ultrasonic cleaning
30min, hot wind air-dry.
Test result is as follows shown in table 1:
As can be seen that commercially available PP melt blown non-woven and PP needle thorn electret nonwoven fabric are in washing 1 time, 5 times, 10 times from above-mentioned table 1
Afterwards, strainability straight line declines, and substantially after washing 1 time and not in the use standard for meeting air purification field, the present invention is ground
The PTFE filter membrane of system still has 98.13% filter efficiency after washing is primary, and the filter effect after washing 5 times is still greater than
90%, still there is 84.12% filter efficiency after washing 10, compare initial value, reduced by only 15.83%.
Antibacterial experiment test is carried out to chitosan anti-bacteria nano fibrous membrane, is commented using the test method of agar plate diffusion method
Valence chitosan anti-bacteria nano fibrous membrane methicillin-resistant staphylococcus aureus ATCC 33591.Agar plate diffusion method test side
Method reference standard GB/T 20944 " the evaluation part 1 of antibacterial textile performance: agar plate diffusion method ", the principle of the experiment
It is that two layers of agar medium is injected in culture dish, lower layer is aseptic culture medium, and upper layer is inoculation medium, and sample is placed on two layers
On culture medium, culture after a certain period of time, according to the degree of culture medium and sample contact position bacterial reproduction, it is anti-qualitatively to evaluate sample
Bacterium property.This experiment is the bacterium solution for being 1x108 ~ 5x108 CFU/mL by concentration, is uniformly coated on agar medium plate, will be straight
Diameter is that the sample of 10mm attaches to media surface, using commercially available PP melt blown non-woven and commercially available PP needle pierce electret nonwoven fabric as pair
In the same old way, it is placed in 37 DEG C of water proof constant incubators and cultivates 18-24h, observe inhibition zone situation.
Test result is as follows shown in table 2:
| Test material title | Antibacterial value | Bacteriostasis rate | GB/T 20944.2-2007 evaluation criterion | Test result evaluation |
| Chitosan anti-bacteria nano fibrous membrane | 2.1 | >99% | When the antibacterial value >=1.0 of sample or bacteriostasis rate >=90%, sample have antibacterial effect;When the antibacterial value of sample >=2.0 or bacteriostasis rate >=99%, sample has good antibacterial effect | Sample has good antibacterial effect |
| Commercially available PP melt blown non-woven | 0.7 | <90% | Ibid | Sample does not have antibacterial effect |
| Commercially available PP needle pierces electret nonwoven fabric | 0.6 | <90% | Ibid | Sample does not have antibacterial effect |
It can be seen that commercially available PP melt blown non-woven and commercially available PP needle pierce electret nonwoven fabric control group from the data of above-mentioned table 2,
Do not have antibiotic property to methicillin-resistant staphylococcus aureus, does not occur inhibition zone.Chitosan anti-bacteria nano fibrous membrane is to it
With good antibiotic property, the mechanism of chitosan anti-bacteria nano fibrous membrane antibacterial is that chitosan macromolecules adsorption is thin in microorganism
Cellular surface forms one layer of polymeric membrane, prevents nutriment to intracellular transport, so that sterilization and antibacterial effect are played,
Meanwhile interacting between the positive charge of chitosan and the negative electrical charge of microbial cell film surface, to change micro- life
Object cell membrane penetrating and then cell membrane is destroyed, causes microbial cell dead and reach antibacterial action.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (10)
1. a kind of reusable air purifying filter mesh of antibacterial, which is characterized in that including non-woven fibre supporting layer (1), filtering
Layer (2), antibiotic layer (3) and coating (4), the non-woven fibre supporting layer (1), filter layer (2), antibiotic layer (3) and cover
Successively hot pressing is compound from the bottom up for cap rock (4)；The filter layer (2) includes PTFE filter membrane, and the antibiotic layer (3) includes that shell is poly-
Sugared antibacterial nanofiber membrane.
2. the reusable air purifying filter mesh of antibacterial according to claim 1, which is characterized in that the PTFE filtering
The aperture of film is 0.18 μm -0.22 μm.
3. the reusable air purifying filter mesh of antibacterial according to claim 1, which is characterized in that the PTFE filtering
The porosity of film is more than or equal to 89%.
4. the reusable air purifying filter mesh of antibacterial according to claim 1, which is characterized in that the chitosan is anti-
Bacterium nano fibrous membrane includes the acetic acid that the chitosan that mass ratio is 3:1 and PEO and mass fraction are greater than 85Wt%.
5. the reusable air purifying filter mesh of antibacterial according to claim 1, which is characterized in that the non-woven fibre
The material of supporting layer (1) is PET spun-bonded non-woven fabrics or glass fibre nonwoven fabric.
6. the reusable air purifying filter mesh of antibacterial according to claim 1, which is characterized in that the coating
(4) material is PP nonwoven fabric or cotton nonwoven fabric.
7. a kind of preparation method of the reusable air purifying filter mesh of antibacterial as claimed in any one of claims 1 to 6,
It is characterized in that, includes the following steps:
The preparation of PTFE filter membrane: by after drying PTFE powder and polar organic solution mixed and squeezed out PTFE item,
PTFE item is rolled into PTFE membrane, and PTFE membrane is heated, stretch, be formed, cut and is wound, obtains PTFE filtering
Film；
The preparation of chitosan anti-bacteria nano fibrous membrane: mass ratio is chosen as chitosan and PEO, the mass fraction of 3:1 and is greater than 85Wt%
Acetic acid be configured to mass fraction be 3 wt%-5wt% spinning solution, spinning solution is subjected to heating stirring, is obtained transparent
Cement solution left standstill deaeration electrostatic spinning is obtained chitosan anti-bacteria nano fibrous membrane by cement solution；
Non-woven fibre supporting layer (1), PTFE filter membrane, chitosan anti-bacteria nano fibrous membrane and coating (4) are taken, from inside to outside
It is successively that non-woven fibre supporting layer (1), PTFE filter membrane, chitosan anti-bacteria nano fibrous membrane and coating (4) hot pressing is compound, system
At the reusable air purifying filter mesh of antibacterial.
8. the preparation method of the reusable air purifying filter mesh of antibacterial according to claim 7, which is characterized in that
The mass fraction of the spinning solution is 3.5wt%-4.5 wt%.
9. the preparation method of the reusable air purifying filter mesh of antibacterial according to claim 7, which is characterized in that
The parameter of the electrostatic spinning are as follows: it be 8-15 cm that voltage, which is 18 ~ 25 kV, receives distance, infuses that push away rate be 0.1-0.3 mm/
Min, substrate conveying speed are 0-5m/min, and Nozzle At The Ingot Mold group movement speed is 0-150mm/s.
10. the preparation method of the reusable air purifying filter mesh of antibacterial according to claim 7, which is characterized in that
It is 35-45 DEG C by the heating temperature that spinning solution carries out heating stirring in the preparation process of chitosan anti-bacteria nano fibrous membrane,
Mixing time is 8-12h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910049699.3A CN109758838A (en) | 2019-01-18 | 2019-01-18 | A kind of reusable air purifying filter mesh of antibacterial and preparation method thereof |
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| CN201910049699.3A CN109758838A (en) | 2019-01-18 | 2019-01-18 | A kind of reusable air purifying filter mesh of antibacterial and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111467878A (en) * | 2020-03-17 | 2020-07-31 | 南京玻璃纤维研究设计院有限公司 | Nanofiber/glass fiber composite filter material, preparation method and application thereof |
| CN111616442A (en) * | 2020-06-08 | 2020-09-04 | 乐昌市宝创环保新材料制品有限公司 | Reusable mask and preparation method thereof |
| CN111729119A (en) * | 2020-06-01 | 2020-10-02 | 北京化工大学 | Air purification assembly with coronavirus killing function and application thereof |
| CN111876906A (en) * | 2020-06-29 | 2020-11-03 | 滁州爸爸的选择科技有限公司 | Non-woven fabric with high filtering performance and processing technology thereof |
| CN112370866A (en) * | 2020-10-28 | 2021-02-19 | 美埃(南京)纳米材料有限公司 | Degradable antibacterial nanofiber non-woven fabric composite filter material and preparation method thereof |
| CN113332864A (en) * | 2021-06-03 | 2021-09-03 | 河南曼博睿新材料科技有限公司 | Compound nanometer antibiotic air filtration membrane |
| CN113731197A (en) * | 2021-09-17 | 2021-12-03 | 山东省科学院新材料研究所 | Preparation method of high-permeability antibacterial polyimide/chitosan composite nanofiber air filtering membrane, product and application thereof |
| CN115445326A (en) * | 2022-09-29 | 2022-12-09 | 天津日津科技股份有限公司 | Compound antibiotic air filtration membrane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111467878A (en) * | 2020-03-17 | 2020-07-31 | 南京玻璃纤维研究设计院有限公司 | Nanofiber/glass fiber composite filter material, preparation method and application thereof |
| CN111729119A (en) * | 2020-06-01 | 2020-10-02 | 北京化工大学 | Air purification assembly with coronavirus killing function and application thereof |
| CN111616442A (en) * | 2020-06-08 | 2020-09-04 | 乐昌市宝创环保新材料制品有限公司 | Reusable mask and preparation method thereof |
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| CN112370866A (en) * | 2020-10-28 | 2021-02-19 | 美埃(南京)纳米材料有限公司 | Degradable antibacterial nanofiber non-woven fabric composite filter material and preparation method thereof |
| CN113332864A (en) * | 2021-06-03 | 2021-09-03 | 河南曼博睿新材料科技有限公司 | Compound nanometer antibiotic air filtration membrane |
| CN113731197A (en) * | 2021-09-17 | 2021-12-03 | 山东省科学院新材料研究所 | Preparation method of high-permeability antibacterial polyimide/chitosan composite nanofiber air filtering membrane, product and application thereof |
| CN113731197B (en) * | 2021-09-17 | 2022-05-20 | 山东省科学院新材料研究所 | Preparation method of high-permeability antibacterial polyimide/chitosan composite nanofiber air filtering membrane, product and application thereof |
| CN115445326A (en) * | 2022-09-29 | 2022-12-09 | 天津日津科技股份有限公司 | Compound antibiotic air filtration membrane |
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Application publication date: 20190517 |