CN111424435A - Air filter medium and preparation method thereof - Google Patents
Air filter medium and preparation method thereof Download PDFInfo
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- CN111424435A CN111424435A CN202010193965.2A CN202010193965A CN111424435A CN 111424435 A CN111424435 A CN 111424435A CN 202010193965 A CN202010193965 A CN 202010193965A CN 111424435 A CN111424435 A CN 111424435A
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- Prior art keywords
- waterborne polyurethane
- base cloth
- filter medium
- cellular
- foaming
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0043—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by their foraminous structure; Characteristics of the foamed layer or of cellular layers
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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
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0059—Organic ingredients with special effects, e.g. oil- or water-repellent, antimicrobial, flame-resistant, magnetic, bactericidal, odour-influencing agents; perfumes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
- D06N3/0088—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
Abstract
The invention provides an air filter medium which comprises base cloth and a barrier layer, wherein the barrier layer is positioned on the base cloth and comprises at least one layer of cellular structure, the cellular structure is formed by adding electret master batches into a foaming agent-containing waterborne polyurethane system for foaming, and at least part of the cells are communicated. The addition of the electret master batch ensures that the foam structure has certain electrostatic adsorption. Under the dual functions of mechanical blocking and electrostatic adsorption, the particle blocking efficiency of the filter medium is better. The invention aims to provide a filter medium for a mask, which has high separation efficiency and a simple preparation process, and solves the problem of mask shortage caused by insufficient meltblown fabric production capacity.
Description
Technical Field
The invention relates to the technical field of masks, in particular to an air filter medium and a preparation method thereof.
Background
The filter layer in the middle of the traditional mask is melt-blown cloth, and the melt-blown cloth is formed by drafting polymer melt trickle extruded from spinneret orifices by adopting high-speed hot air flow, so that superfine fibers are formed and collected on a condensing screen curtain or a roller, and are bonded by the condensing screen curtain or the roller to form melt-blown non-woven cloth. The melt-blown fabric has good filterability, barrier property, heat preservation property and adsorbability, is an important material for filtering pathogenic microorganisms, body fluid and particulate matters, but has the advantages of complex preparation process, high technical content, high investment cost and low yield value. Particularly, after the coronavirus epidemic situation occurs, the demand of the mask is increased sharply, the melt-blown cloth is used as the most important material in the mask, the supply is insufficient, the price of the melt-blown cloth is increased by at least 10 times, and some intermediate merchants even require 40 ten thousand yuan/ton, so that a novel material is urgently needed to be developed to replace a melt-blown cloth filter layer, the novel material can have the efficient particle blocking rate of the melt-blown cloth, the production process can be simplified, and the productivity is enlarged.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an air filter medium and a method for manufacturing the same, which can be used in a mask instead of meltblown to solve the problem in the prior art that the mask cannot meet the market demand due to the complex manufacturing process and limited productivity of meltblown.
To achieve the above and other related objects, the present invention provides an air filter medium comprising: the barrier layer is positioned on the base cloth and comprises at least one layer of cellular structure, the cellular structure comprises waterborne polyurethane, electret master batches and a foaming agent, the diameter of the cellular is less than or equal to 10 mu m, and at least part of the cellular is communicated.
In one embodiment of the invention, the raw materials of the barrier layer comprise 100 parts by mass of waterborne polyurethane, 0.5-1 part by mass of wetting agent, 3-10 parts by mass of flame retardant, 5-20 parts by mass of electret master batch, 0.3-5 parts by mass of antibacterial material and 3-6 parts by mass of foaming agent.
In an embodiment of the invention, the aqueous polyurethane is a nonionic aqueous polyurethane or a sulfonic acid aqueous polyurethane.
Preferably, the solid content of the aqueous polyurethane is 40-50%.
In an embodiment of the present invention, the wetting agent is one or a mixture of several of ammonium polycarboxylate, silicone surfactant, nonionic polyurethane, and aromatic polyethylene glycol ether ester.
In an embodiment of the present invention, the flame retardant is a phosphorus-nitrogen flame retardant.
In an embodiment of the present invention, the electret masterbatch is nano tourmaline powder.
In an embodiment of the present invention, the antibacterial material is silver, copper, zinc ion antibacterial agent, vanillin or ethyl vanillin compound.
In an embodiment of the present invention, the foaming agent is one or more of sodium sulfosuccinate, sodium dodecylbenzenesulfonate, ammonium stearate, and an organosilicon surfactant.
The invention provides a preparation method of an air filter medium, which comprises the following steps:
providing a base cloth; forming a barrier layer on the base cloth, wherein the foam pore structure comprises waterborne polyurethane, electret master batches and a foaming agent, the diameter of the foam pores is less than or equal to 10 mu m, and at least part of the foam pores are communicated with each other.
In one embodiment of the present invention, a method for preparing an air filter medium comprises the following steps: mixing and dispersing waterborne polyurethane, a wetting agent, a flame retardant, electret master batches, an antibacterial material and a foaming agent to obtain waterborne polyurethane slurry; foaming the waterborne polyurethane slurry to obtain a foaming slurry; coating the foamed slurry on the base cloth, and drying and shaping in an oven; repeating the steps of coating and drying for one or more times to obtain the air filter medium.
Preferably, the dispersing and stirring time of each raw material is 5-10 min.
Preferably, the aqueous polyurethane slurry is prepared by emulsifying and dispersing air into the slurry by a mechanical foaming machine by adopting a mechanical foaming method, and the foaming ratio is 1.3-3 times.
The invention also provides a mask, which comprises a mask body and a filter medium, wherein the filter medium is contained in the mask body, the filter medium comprises a base cloth and a barrier layer, the barrier layer is positioned on the base cloth, the barrier layer comprises at least one layer of cellular structure, the cellular structure comprises waterborne polyurethane, electret master batches and a foaming agent, the diameter of the cellular structure is less than or equal to 10 mu m, and at least part of the cellular structure is communicated with each other.
As mentioned above, the invention provides an air filter medium and a preparation method thereof, the air filter medium comprises a base cloth and a barrier layer, the barrier layer is positioned on the base cloth, the barrier layer comprises at least one layer of cellular structure, the cellular structure is formed by adding electret master batch into a foaming agent-containing waterborne polyurethane system for foaming, and at least part of the cellular structure is communicated with each other. Electret master batches are added into the waterborne polyurethane system, and the formed foam hole layer increases electrostatic adsorption on the basis of mechanical blocking, so that the filtering efficiency is greatly increased. The filter medium has high particle blocking rate and simple preparation method, can replace melt-blown cloth to be applied to the mask, and solves the problem of insufficient mask supply caused by limited melt-blown cloth capacity.
Drawings
FIG. 1 illustrates a flow diagram of one embodiment of a method of making an air filtration media of the present invention.
FIG. 2 shows a block diagram of an air filter media of the present invention.
Description of the element reference numerals
1 base cloth
2 barrier layer
Detailed Description
The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be understood that the specific material ratios, process conditions and results described in the embodiments are merely illustrative of the disclosure of the present invention and are not intended to limit the scope of the present invention, which is defined by the claims, and therefore should not be construed as limiting the scope of the present invention.
Referring to the attached figure 2, the air filter medium comprises a base cloth 1 and a barrier layer 2, wherein the barrier layer 2 is located on the base cloth 1, the barrier layer 2 comprises at least one layer of cellular structure, the cellular structure comprises waterborne polyurethane, electret master batches and a foaming agent, the diameter of the cellular structure is less than or equal to 10 microns, and at least part of the cellular structure is communicated with each other. The air filter medium is formed by foaming waterborne polyurethane and then coating a barrier layer 2 on a base cloth 1. The base fabric 1 may be a polypropylene nonwoven fabric, for example.
The raw material components of the barrier layer 2 comprise 100 parts by mass of waterborne polyurethane; 0.5-1 part by mass of wetting agent, and 0.5, 0.7 and 1.0 part by mass can be selected in one embodiment; 3-10 parts by mass of flame retardant, and 3, 5, 7 and 10 parts by mass can be selected in one embodiment; 5-20 parts by mass of electret master batch, which can be selected from 5, 10, 15 and 20 parts by mass in one embodiment; 0.3-5 parts by mass of an antibacterial material, and 0.3, 2, 4 and 5 parts by mass can be selected in one embodiment; 3-6 parts by mass of foaming agent, and 3, 4 and 6 parts by mass can be selected in one embodiment.
The waterborne polyurethane provides a cellular structure for blocking particles for the whole filter medium, and plays a role in mechanically blocking the particles, and the size of the diameter of the cells determines the resistance of the filter medium. When the diameter of the foam hole is too large, the blocking efficiency of the particles is poor, and the purification effect cannot be achieved; the diameter of the cells is too small, the resistance of the filter medium is large, the breathing resistance is large when the filter medium is used for a mask, and the breathing is difficult when a human body wears the mask, so the diameter of the cells is less than 10 mu m. The foaming agent can effectively reduce the surface tension of liquid, is arranged on the surface of a liquid film by two electronic layers to surround air to form bubbles, and then forms foam by single bubbles. The electret master batch is added in the barrier layer 2, the electrostatic adsorption of the electret master batch is utilized, so that the electrostatic adsorption is increased in the air filtering process of the barrier layer 2, charged particles in the gas phase are directly absorbed and captured by coulomb force, or neutral particles are induced to generate polarity and then captured, the submicron particles in the gas carrier phase can be more effectively filtered, the filtering efficiency is greatly enhanced, and the air resistance cannot be increased. The flame retardant can enable the filter medium to have certain flame retardance; wetting agent, reduce surface tension or interfacial tension of aqueous polyurethane, can spread on the surface of the solid material, or penetrate its surface, and wet other solid materials; the antibacterial material enables the filter medium to have certain antibacterial property, and inhibits or kills bacteria adsorbed on the surface of the filter medium.
The aqueous polyurethane can be nonionic aqueous polyurethane or sulfonic acid aqueous polyurethane with the solid content of 40-50%, or nonionic aqueous polyurethane or sulfonic acid aqueous polyurethane with the solid content of 40%, 42%, 45% or 50%; the wetting agent can be selected from one or a mixture of more of polycarboxylic acid ammonium salt, organosilicon surfactant, nonionic polyurethane and aryl polyethylene glycol ether ester; the flame retardant is a phosphorus-nitrogen flame retardant; the electret master batch is nano tourmaline powder; the antibacterial material is silver, copper, zinc ion antibacterial agent, vanillin or ethyl vanillin compound; the foaming agent is one or a mixture of sodium sulfosuccinate, sodium dodecyl benzene sulfonate, ammonium stearate and organosilicon surfactant.
Referring to fig. 1, in another aspect of the present invention, a method for preparing such an air filter medium is also provided, including but not limited to steps S1-S5,
step S1, providing a base fabric 1, such as polypropylene non-woven fabric;
step S2, mixing and dispersing the waterborne polyurethane, the wetting agent, the flame retardant, the electret master batch, the antibacterial material and the foaming agent to obtain waterborne polyurethane slurry;
step S3, foaming the waterborne polyurethane slurry to obtain foaming slurry;
step S4, coating the foamed slurry on the base cloth 1, and drying and shaping in an oven;
and step S5, repeating the steps of coating and drying for one or more times to obtain the air filter medium.
Specifically, in step S2, aqueous polyurethane, wetting agent, flame retardant, electret masterbatch, antibacterial material, and foaming agent are sequentially added to mix and disperse under stirring, and each material is stirred for 5-10 minutes after being added and uniformly dispersed;
specifically, in step S3, the aqueous polyurethane slurry is dispersed and emulsified in air into the slurry by a mechanical foaming method using a mechanical foaming machine, and the foaming ratio is 1.3 to 3 times.
Specifically, in step S4, a precision coating machine is used to coat the foamed slurry on the base cloth 1, and the base cloth is dried in a constant temperature oven, wherein the coating thickness is 0.3-0.5mm, and the drying temperature is 80-120 ℃.
Because the blocking rate of the particles is only 40-50% after coating once, which is far from the blocking requirement of the filter medium, the step S5 is needed to be carried out, the coating and drying steps are repeated once or many times, and the coating and drying steps can be repeated once or twice according to the blocking efficiency requirement.
In one embodiment, the barrier layer 2 comprises the following raw materials in parts by mass: 100 parts of non-ionic water-based polyurethane with the solid content of 42%, 0.5-1 part of polycarboxylate wetting agent, 3-10 parts of phosphorus-nitrogen flame retardant, 5-20 parts of nano tourmaline powder, 0.3-5 parts of silver ion antibacterial agent and 3-6 parts of sodium dodecyl benzene sulfonate foaming agent.
The preparation method of the air filter medium comprises the following steps: sequentially adding 100 parts of nonionic waterborne polyurethane, 0.5-1 part of polycarboxylic acid ammonium salt wetting agent, 3-10 parts of phosphorus-nitrogen flame retardant, 3-10 parts of nano tourmaline powder, 0.3-5 parts of silver ion antibacterial agent and 3-6 parts of sodium dodecyl benzene sulfonate foaming agent into a reaction container under a stirring state, stirring each auxiliary agent for 5-10 minutes, and uniformly mixing and dispersing; emulsifying and dispersing air into the aqueous polyurethane slurry by adopting a mechanical foaming machine until the foaming multiplying power is 1.3-3 times; coating the foamed slurry on the treated polypropylene non-woven fabric by a precision coating machine, wherein the coating thickness is 0.3-0.5 mm; drying the polypropylene non-woven fabric coated with the foaming layer in a constant-temperature oven at 80-120 ℃; and repeating coating and drying for one time to obtain the air filter medium, which is marked as the filter medium A, and the performance detection results are shown in Table 1.
In another embodiment, the raw materials and mass parts of the barrier layer 2 are as follows: 100 parts of sulfonic acid type waterborne polyurethane with the solid content of 50 percent, 0.5-1 part of aryl polyethylene glycol ether ester wetting agent, 3-10 parts of phosphorus-nitrogen flame retardant, 5-20 parts of nano tourmaline powder, 0.3-5 parts of copper ion antibacterial agent and 3-6 parts of sodium sulfosuccinate foaming agent.
The preparation method of the air filter medium comprises the following steps: sequentially adding 100 parts of sulfonic acid type waterborne polyurethane, 0.5-1 part of aromatic polyethylene glycol ether ester wetting agent, 3-10 parts of phosphorus-nitrogen flame retardant, 3-10 parts of nano tourmaline powder, 0.3-5 parts of copper ion antibacterial agent and 3-6 parts of sodium sulfosuccinate foaming agent into a reaction container under a stirring state, stirring each auxiliary agent for 5-10 minutes, and uniformly mixing and dispersing; emulsifying and dispersing air into the aqueous polyurethane slurry by adopting a mechanical foaming machine until the foaming multiplying power is 1.3-3 times; coating the foamed slurry on the treated polypropylene non-woven fabric by a precision coating machine, wherein the coating thickness is 0.3-0.5 mm; drying the polypropylene non-woven fabric coated with the foaming layer in a constant-temperature oven at 80-120 ℃; and repeating coating and drying twice to obtain the air filter medium, marking as the filter medium B, and referring to the detection results in table 1.
And (3) detection results: the performance of the air filter media prepared in the two examples is tested according to the national standard GB/T2626-2006, and the test results are shown in Table 1.
Table 1: EXAMPLES 1-2 results of testing the Performance of air Filter media
The detection results in the table 1 show that the invention provides an air filter medium, the electret master batch is added in the barrier layer 2, and then the barrier layer 2 is coated on the base cloth 1 to form the air filter medium, the air filter medium has good particle blocking efficiency, meets the requirements of a mask filter layer, can replace the application of melt-blown cloth in a mask, saves the investment cost, has a simple preparation method, can meet the large-scale production, and solves the problem of insufficient mask supply.
In conclusion, the invention discloses an air filter medium and a preparation method thereof, the filter medium is simple in preparation method, good in particle blocking rate and excellent in performance, can be applied to a mask instead of melt-blown cloth, and solves the problem that the mask cannot meet market requirements due to limited melt-blown cloth capacity. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An air filtration medium, comprising:
a base cloth;
the barrier layer is positioned on the base cloth and comprises at least one layer of cellular structure, the cellular structure comprises waterborne polyurethane, electret master batches and foaming agents, the diameter of the cellular is less than or equal to 10 mu m, and at least part of the cellular is communicated.
2. The air filter medium of claim 1, wherein the raw materials of the barrier layer comprise 100 parts by mass of waterborne polyurethane, 0.5-1 part by mass of wetting agent, 3-10 parts by mass of flame retardant, 5-20 parts by mass of electret masterbatch, 0.3-5 parts by mass of antibacterial material and 3-6 parts by mass of foaming agent.
3. An air filtration media according to claim 2, wherein: the waterborne polyurethane is nonionic waterborne polyurethane or sulfonic waterborne polyurethane, and the solid content of the waterborne polyurethane is 40-50%.
4. An air filtration media according to claim 2, wherein: the wetting agent is one or a mixture of more of polycarboxylic acid ammonium salt, organosilicon surfactant, nonionic polyurethane and aromatic polyethylene glycol ether ester.
5. An air filtration media according to claim 2, wherein: the electret master batch is nano tourmaline powder.
6. An air filtration media according to claim 2, wherein: the antibacterial material is silver, copper and zinc ion antibacterial agent, vanillin or ethyl vanillin compound.
7. An air filtration media according to claim 2, wherein: the foaming agent is one or more of sodium sulfosuccinate, sodium dodecyl benzene sulfonate, ammonium stearate and an organic silicon surfactant.
8. A method of making an air filtration media comprising the steps of:
providing a base cloth;
forming a barrier layer on the base cloth, wherein the barrier layer comprises at least one layer of cellular structure, the cellular structure comprises waterborne polyurethane, electret master batches and a foaming agent, the diameter of the cellular is less than or equal to 10 mu m, and at least part of the cellular is communicated.
9. The method of making an air filtration media of claim 8, wherein: the method comprises the following steps:
mixing and dispersing waterborne polyurethane, a wetting agent, a flame retardant, electret master batches, an antibacterial material and a foaming agent to obtain waterborne polyurethane slurry;
foaming the waterborne polyurethane slurry to obtain a foaming slurry;
coating the foamed slurry on the base cloth, and drying and shaping in an oven;
repeating the steps of coating and drying for one or more times to obtain the air filter medium.
10. A mask, characterized in that the mask comprises,
the cover body is provided with a cover body,
a filter media housed within the housing, wherein the filter media comprises,
a base cloth;
the barrier layer is positioned on the base cloth and comprises at least one layer of cellular structure, the cellular structure comprises waterborne polyurethane, electret master batches and foaming agents, the diameter of the cellular is less than or equal to 10 mu m, and at least part of the cellular is communicated.
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