KR20220015605A - Nanofiber filter using non-woven fabric and its manufacturing method - Google Patents

Abstract

The present invention relates to a nanofiber filter, which can secure antibacterial properties, breathability and visibility, obtain excellent collection efficiency of dust including infectious pathogens, and be adhered with an eco-friendly water-based adhesive to be applied to various things; and to a method for manufacturing the nanofiber filter. The method comprises the steps of: a) introducing a first non-woven fabric layer into an electrospinning apparatus; b) electrospinning a polyvinylidene fluoride (PVDF) solution on the first non-woven fabric layer to form a nanofiber layer; c) rough-coating an upper surface of the nanofiber layer and a lower surface of a second non-woven fabric layer with an eco-friendly water-based adhesive using a roller; d) winding the nanofiber layer and the second non-woven fabric layer on a paper tube or a drum, respectively, and then leaving the same at room temperature for 2 to 6 hours to have the roughly coated water-based adhesive permeate into the nanofiber layer and the second non-woven fabric layer; e) coating the upper surface of the nanofiber layer with the eco-friendly water-based adhesive for finishing; f) performing thermocompression bonding and bonding by passing the first non-woven fabric layer, the nanofiber layer, and the second non-woven fabric layer having gone through finishing coating with the eco-friendly water-based adhesive between upper and lower rollers heated to a temperature of 60 to 90℃; and g) completely drying the result at room temperature for 24 to 96 hours.

Description

Nanofiber filter using non-woven fabric and its manufacturing method

The present invention relates to a nanofiber filter using a non-woven fabric and a method for manufacturing the same, and more particularly, by adhering a nanofiber layer and a nonwoven fabric protecting the nanofiber layer with an eco-friendly water-based adhesive, it has excellent antibacterial properties and breathability, It can be applied to various things including, and it is designed to obtain excellent filter efficiency for various kinds of dust including infectious pathogens.

In general, the nanofiber (Nano Fiber) refers to a microfiber having a diameter of only several tens to several hundreds of nanometers, and is produced by an electric field. That is, nanofibers apply a high-voltage electric field to the raw material polymer material to generate an electrical repulsive force inside the raw material polymer material. is manufactured and produced. At this time, the stronger the electric field, the finer the polymer material, which is the raw material, so that nanofibers having a fineness of 1 nm to 1,000 nm can be obtained.

On the other hand, a filter is a filtering device that filters out foreign substances in a fluid and is classified into a liquid filter and an air filter. In particular, an air filter is a particle such as dust or dust in the air, gas, bacteria, pathogens, mold, bacteria, viruses, etc. It is also used to remove harmful substances.

Conventional air filters made of simple nonwoven fabric have advantages of a simple manufacturing process and low cost, so they are widely used in various applications. However, they have the disadvantage of low dust filtration efficiency. There is a problem in that the collecting ability of

In order to supplement the fine dust collection efficiency, which is one of the disadvantages of the non-woven type air filter, an air filter using an electrostatic filter to which an electrostatic charge is applied has been developed and used. (結露), there is a problem in that the electrostatic characteristics of the electrostatic filter are reduced according to the contact or penetration of moisture, and the dust collection efficiency is rapidly reduced. That is, there was a problem in that the dust collection efficiency of 99,97% in the initial stage was sharply decreased to about 30% due to the reduction of the electrostatic characteristics as described above, and the filter function was almost lost.

Republic of Korea Patent Publication No. 10-1585506 (Title of the invention: PVDF nanofiber-based patterned flexible piezoelectric element using electrospinning method and manufacturing method thereof, 2016. 01. 15. Patent announcement) Republic of Korea Patent Publication No. 10-1079775 (Title of the invention: Electrically conductive nanofiber manufacturing method through electrospinning followed by electroless plating, 2011. 11. 03. Patent announcement)

The present invention adheres to the nonwoven fabric that protects the nanofiber layer and the nanofiber layer with an eco-friendly water-based adhesive, so that it has excellent antibacterial properties, breathability and visibility, and can be applied to various objects including the human body. An object of the present invention is to provide a nanofiber filter using a nonwoven fabric capable of obtaining excellent filter (or collection or dust collection) efficiency and a method for manufacturing the same.

A nanofiber filter using a nonwoven fabric according to an embodiment of the present invention and a method for manufacturing the same include: a) putting a first nonwoven fabric layer into an electrospinning device; b) polyvinylidene fluoride (PVDF) on the first nonwoven fabric layer ) Forming a nanofiber layer by electrospinning a solution or a polyurethane (PU: polyurethane) solution, c) Applying an eco-friendly water-based adhesive to the upper surface of the nanofiber layer and the bottom surface of the second non-woven fabric layer as a roller A step of rough coating, d) winding the nanofiber layer and the second nonwoven fabric layer on a paper tube or drum, respectively, and then leaving it at room temperature for 2 to 6 hours to permeate so that the water-based adhesive coated with the primer permeates into the nanofiber layer and the second nonwoven fabric layer Step, e) finish coating an eco-friendly water-based adhesive on the upper surface of the nanofiber layer with a roller, f) the first non-woven fabric layer, the nano-fiber layer and the second non-woven fabric layer coated with the eco-friendly water-based adhesive at a temperature of 60 to 90 ° C. It includes the steps of thermocompression bonding and bonding by passing between the upper and lower rollers heated to temperature, and g) complete drying at room temperature for 24 to 96 hours.

The method for manufacturing a nanofiber filter using a nonwoven fabric of another embodiment of the present invention comprises: a`) rough coating an eco-friendly water-based adhesive on the upper surface of the first nonwoven layer with a roller, and b`) the moisture content of the first nonwoven fabric layer coated with the rough Natural drying at room temperature to maintain this 40 to 60%, c`) putting the first nonwoven layer into the electrospinning device, and d`) polyvinylidene fluoride (PVDF) solution or Forming a nanofiber layer by electrospinning a solution of any one of the polyurethane (PU) solutions, e`) Coating the upper surface of the nanofiber layer and the bottom surface of the second nonwoven layer with an eco-friendly water-based adhesive with a roller And, f`) The nanofiber layer and the second nonwoven layer are wound on a paper tube or drum, respectively, and then left at room temperature for 2 to 6 hours to permeate the water-based adhesive coated with the chaebol to permeate into the nanofiber layer and the second nonwoven layer, g`) Finish coating an eco-friendly water-based adhesive on the upper surface of the nanofiber layer with a roller; h`) Pass the nanofiber layer and the second nonwoven fabric layer between the upper and lower rollers heated to a temperature of 60 to 90° C. to perform thermocompression bonding and bonding and i`) completely drying at room temperature for 24 to 96 hours to obtain a nanofiber filter.

Instead of completely drying at room temperature for 24 to 96 hours to obtain a nanofiber filter, heating and drying for 12 to 24 hours in a drying room at 60 to 90 ° C. and then completely drying at room temperature for 12 to 24 hours to obtain a nanofiber filter. .

The eco-friendly water-based adhesive includes 5 to 15% by weight of water, 10 to 22% by weight of an aqueous EVA copolymer, 65 to 75% by weight of an aqueous acrylic copolymer, and 2 to 5% by weight of a VOC reducing agent.

The water-based adhesive coating (application) amount may be 8 to 30 g/m 2 .

The glass transition temperature (Tg value) of the water-based adhesive may be -25 to 0 ℃.

It may further include 1 to 10% by weight of adipic dihydrazide (ADIPIC DIHYDRAZIDE) mixed in the water-based adhesive.

Further comprising 2 to 8% by weight of a water-repellent liquid mixed in the water-based adhesive, wherein the water-repellent liquid may be an eco-friendly fluorine-based water-repellent liquid of C6 or less or a silicone-based water-repellent liquid.

The glass transition temperature of the water-based adhesive may be -25 to 0° C., and the viscosity may be 300 to 800 cps.

It includes a nanofiber filter using a nonwoven fabric manufactured by at least one of the above manufacturing methods.

The nanofiber filter includes a first nonwoven fabric layer, a nanofiber layer electrospun and bonded to the upper surface of the first nonwoven fabric layer with a polyvinylidene fluoride (PVDF) solution, and a first adhered to the upper surface of the nanofiber layer 2 includes a non-woven fabric layer.

The nanofiber filter, a first nonwoven fabric layer, a nanofiber layer electrospun and bonded to the upper surface of the first nonwoven fabric layer with a polyurethane (PU) solution, and a second nonwoven fabric layer adhered to the upper surface of the nanofiber layer includes

The nanofiber layer may have a basis weight of 0.05 to 0.5 gsm and air permeability of 80 to 150 cfm.

The basis weight of the first nonwoven fabric layer may be 10 to 50 gsm.

The basis weight of the second nonwoven fabric layer may be 10 to 100 gsm.

The amount of the water-based adhesive coated on the first and second non-woven fabric layers and the nanofiber layer may be 8 to 30 g/m 2 .

In the present invention, fine dust viruses, etc. are filtered, so that an excellent effect can be obtained as a filter, and volatile organic compounds (VOC), formaldehyde, acetaldehyde, etc. are not detected, so only objects or articles applied to the human body (face mask, coating) Rather, it has an effect that can be applied to various things.

According to the present invention, nano-sized pores smaller than fine particles and larger than air are formed in the nanofiber layer 2, so dust, particulate harmful substances, mist, dust including fine dust, yellow sand, pollen, fine particles, etc. Dust), as well as various pathogens, bacteria, bacteria, and infectious agents such as viruses and/or droplets containing them, are effectively blocked.

In the present invention, the 'differential pressure', which is the pressure difference before and after passing through the nanofiber layer 2, is maintained at 1.4 to 5 tablets, which is very convenient for breathing.

In addition, a typical MB filter (or HEPA filter) absorbs and collects fine dust in an electrostatic method, so it is weak to moisture or moisture, so when worn for a long time, the performance is deteriorated and there are problems such as shrinkage, but the nanofiber filter of the present invention It is a physical method in which dense nano-scale fiber strands are entangled and filtered, and because it blocks harmful substances such as particulates, gases, bacteria, pathogens, mold, bacteria, and viruses in the air, it is hardly affected by moisture or moisture. In addition, various harmful components are not detected in the safety test or are less than the standard value, so there is an effect that can be used with confidence.

The present invention has the effect that it can be usefully used as a human body coating such as a mask, hat, glove, etc. because the nanofiber filter having a multi-layer structure is well bonded by an aqueous adhesive that is harmless to the human body.

The present invention not only has excellent water repellency without a separate water repellent treatment, but also has the effect of doubling the water repellency by additionally applying a water repellent solution.

The present invention has the effect of not only being harmless to the human body because heavy metals and other harmful substances and formaldehyde harmful to the human body are not detected, but also blocking and killing bacteria, mold, bacteria, and viruses in a short time by the antibacterial material.

The present invention is a very useful invention that is effective in preventing the transmission of viruses, bacteria, bacteria, pathogens, etc. by saliva or droplets.

Figure 1: An exemplary configuration of the nanofiber filter of the present invention.
Figure 2: A flow chart of a method for manufacturing a nanofiber filter shown in an embodiment of the present invention.
Figure 3: A flow chart of a method for manufacturing a nanofiber filter shown in another embodiment of the present invention.
Figure 4: A scanning electron microscope image (5,000 magnification) showing the nanofiber layer in the present invention.
Figure 5: A scanning electron microscope image (10,000 magnification) showing the nanofiber layer in the present invention.
Figure 6: Blank photograph of strain 1 in the present invention antibacterial activity.
Figure 7: A photograph of the test result of strain 1 in the antibacterial activity experiment of the present invention (18 hours elapsed).
Figure 8: Blank photograph of strain 2 in the present invention antibacterial activity.
Figure 9: A photograph of the test result of strain 2 in the antibacterial activity experiment of the present invention (18 hours elapsed).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the embodiments of the present invention, the same components in the drawings are denoted by the same reference numerals as much as possible, and detailed descriptions of related known configurations or functions are omitted so as not to obscure the gist of the present invention, and also in the accompanying drawings Matters expressed in may be different from the forms actually implemented in the drawings schematically for easy explanation of the embodiments of the present invention.

1 illustrates a layer structure of a nanofiber filter using the nonwoven fabric of the present invention, and a first nonwoven fabric layer 1 and polyvinylidene fluoride (PVDF) on the upper surface of the first nonwoven fabric layer 2 A solution or a polyurethane (PU: polyurethane) solution includes a nanofiber layer 2 that is electrospun and bonded with a solution, and a second nonwoven layer 3 that is adhered to the upper surface of the nanofiber layer 2 .

The nanofiber layer 2 has pores smaller than fine particles and larger than air, so that the pores of the nano-sized particles are formed. In addition, infectious agents such as various bacteria, pathogens, fungi, bacteria, and viruses and/or droplets containing them are effectively blocked.

The non-woven fabric constituting the first and second non-woven fabric layers (1) and (3) is formed into a felt by arranging fibers in parallel or irregular directions without going through a weaving process and bonding them with a synthetic resin adhesive or thermocompression bonding. As made, there are felt, resin adhesive nonwoven fabric, needle punch, spun bond, spun lace, emboss film, wet nonwoven fabric, melt blown, and the like.

The melt blown filter (MB filter) is a nonwoven filter made by a manufacturing method of melting a thermoplastic polymer such as PET or PP (polypropylene) and extruding it through a nozzle. have the same structural form as It is a material widely used for industrial and medical purposes, and is a key raw material used as an internal filter for medical and health masks distributed in the market, including KF masks. Meltblown (melt spinning) is a method in which the melted polypropylene raw material is blown out in the form of a thread through a nozzle with a very small hole. It passes between two rollers and is pressed to form a non-woven fabric.

The first and second non-woven fabric layers (1) (3) are adhered or fixed to the upper and lower surfaces of the nanofiber layer (2) to sufficiently protect the nanofiber layer (2) and maintain air permeability, durability, and the like.

In the above, the first nonwoven fabric layer 1 input to the electrospinning device (not shown) is the first nonwoven fabric layer 3 so that the electrospinning and the nanofiber layer 2 are efficiently formed while the contact area is enlarged and uniformly fixed. ) is more densely formed.

For example, the basis weight of the first nonwoven fabric layer 1 may be 10 to 50 gsm, and the basis weight of the second nonwoven fabric layer 3 may be 10 to 100 gsm.

The first and second nonwoven layers (1) and (3) are polyvinylidene fluoride (PVDF), olefin-based polypropylene (PP), polyurethane (PU: polyurethane), polyvinyl acrylate (PVA), polyacnyl one main raw material selected from the group consisting of ronitrile (PAN), polylactic acid (PLA), polyelactide (PLLA), polyethersulfone (PES), polyamide (PA) and gelatin; Dimethylacetamide (DMAC), dimethyl fluorine (DMF), dimethyl sulfoxide (DMSO), chlorobenzene (CB), trichloroethanol (TCE), trifluoroethylene (TFE), tetrahydrofuran (THF), Methyl ethyl ketone (MEK), toluene (Toluene), xylene (Xylene), formic acid, acetic acid, at least one solvent selected from the group consisting of water is 8 to 20 wt%: Extrusion manufactured at a mixing ratio of 92 to 80 wt% can

The first and second nonwoven fabric layers 1 and 3 may be spunbond nonwoven fabrics.

The amount (coating amount) of the water-based adhesive to be coated on the first and second non-woven fabric layers (1) (3) and the nanofiber layer (2) is 8 to 30 g/m 2 . When the application amount of the water-based adhesive is less than 8 g/m2, the desired adhesive strength cannot be obtained, and when the application amount exceeds 30 g/m2, it is not only wasted, but also the nanofiber layer 2 and the nanocell are broken by an excessive amount (brittle) ), damage and/or destruction, which is undesirable.

The first non-woven fabric layer (1), the nano-fiber layer (2) and the second non-woven fabric layer (3) are adhered with an eco-friendly water-based adhesive that is harmless to the human body. The water-based adhesive has no odor and is safe and harmless to the human body by using an eco-friendly material that does not contain harmful substances.

2 is a view showing a method of manufacturing a nanofiber filter according to an embodiment of the present invention, and the first nonwoven fabric layer 1 is put into the electrospinning apparatus (step S1), and then polyvinylidene on the first nonwoven fabric layer 1 Electrospinning a fluoride (PVDF) solution or a polyurethane (PU) solution to form a nanofiber layer 2 (step S2), the upper surface of the nanofiber layer 2 and the bottom surface of the second nonwoven layer 3 First roll coating the eco-friendly water-based adhesive with a roller (step S3), and winding the nanofiber layer (2) and the second non-woven fabric layer (3) coated with the eco-friendly water-based adhesive on a paper tube or drum, respectively. After leaving at room temperature for 6 hours, the water-based adhesive coated with the first roll is allowed to penetrate sufficiently into the nanofiber layer 2 and the second nonwoven fabric layer 3 (step S4), and on the upper surface of the nanofiber layer 2 Finish roll coating the eco-friendly water-based adhesive with a roller (step S5), and 60~ The nanofiber filter is obtained by passing it through between the upper and lower rollers heated to a temperature of 90° C., followed by thermocompression bonding and bonding (step S6), and then completely drying at room temperature for 24 to 96 hours (step S7).

Instead of being completely dried at room temperature for 24 to 96 hours (step S7), the nanofiber filter can be obtained by heating and drying for 12 to 24 hours in a drying room at 60 to 90° C. and then completely drying at room temperature for 12 to 24 hours (step S8).

3 shows a method for manufacturing a nanofiber filter according to another embodiment of the present invention, and first roll coating an eco-friendly water-based adhesive on the upper surface of the first non-woven fabric layer 1 with a roller (step S11), and eco-friendly After natural drying at room temperature so that the moisture content of the first nonwoven fabric layer 1 coated with the water-based adhesive is maintained at 40-60% (step S12), the first nonwoven fabric layer 1 is put into the electrospinning device (step S13) , a polyvinylidene fluoride (PVDF) solution or a polyurethane (PU) solution is electrospun on the first nonwoven fabric layer (1) to form a nanofiber layer (2) (step S14), and the upper portion of the nanofiber layer (2) Secondary roll coating with an eco-friendly water-based adhesive on the bottom surface of the cotton and the second non-woven fabric layer (3) (step S15), the nano-fiber layer (2) and the second non-woven fabric layer (3) coated with an eco-friendly water-based adhesive ) is wound on a paper tube or drum, and then left at room temperature for 2 to 6 hours to allow the water-based adhesive coated with the chaebol to permeate sufficiently into the nanofiber layer 2 and the second nonwoven fabric layer 3 (step S16), and the nanofiber layer The upper surface of (2) is finish roll coated with an eco-friendly water-based adhesive with a roller (step S17), and the first non-woven fabric layer (1) and the eco-friendly water-based adhesive are finish coated with the nano-fiber layer (2) and the second non-woven fabric The layer (3) is passed between the upper and lower rollers heated to a temperature of 60 to 90° C., followed by thermocompression bonding and bonding (step S18), and then completely dried at room temperature for 24 to 96 hours to obtain a nanofiber filter (step S19) .

Instead of being completely dried at room temperature for 24 to 96 hours (step S19), the nanofiber filter can be obtained by heating and drying for 12 to 24 hours in a drying room at 60 to 90° C. and then completely drying at room temperature for 12 to 24 hours (step S20).

The eco-friendly water-based adhesive is an eco-friendly hybrid adhesive containing a water-based ethylene vinyl acetate (EVA) copolymer and a water-based acrylic copolymer, and it turns transparent after drying (or curing) and leaves no traces.

The eco-friendly water-based adhesive contains 5 to 15% by weight of water, 10 to 22% by weight of an aqueous EVA (ethylene vinyl acetate) copolymer, 65 to 75% by weight of an aqueous acrylic copolymer, and 2 to 5% by weight of a VOC reducing agent do.

The glass transition temperature of the eco-friendly water-based adhesive is -25 to 0° C., and the viscosity is 300 to 800 cps.

If the glass transition temperature is less than -25 ℃, there is a problem that the shape of the nanofiber filter can be easily deformed as the bendability (ductility) of the nanofiber filter is too soft. It is preferable to have a glass transition temperature of -25°C to 0°C, which is soft and has excellent adhesion, because rejection may occur.

The EVA copolymer (ethylene-vinyl acetate copolymer) is a polymer obtained by copolymerizing ethylene and a vinyl acetate monomer, and is also called an ethylene vinyl acetate copolymer. Because of its excellent stress cracking resistance, it is used for heavy packaging materials and adhesives for laminate films. 10-20% of EVA is used in applications such as foam molded products such as sandals and soles, agricultural films, and flexible vinyl chloride such as stretch films for business use. A high concentration of EVA is used as a raw material for adhesives.

The acrylic copolymer (acrylic resin) refers to a polymer from an ester such as acrylic acid or methacrylic acid, and a polymer of methyl methacrylate ester (methyl methacrylate) is representative. It is colorless and transparent and transmits light, especially ultraviolet rays, better than ordinary glass (refractive index 1.49). It does not discolor even when exposed outdoors, has good chemical resistance, and has good electrical insulation and water resistance.

The VOC reducing agent may be an aqueous solution containing 69 to 90% by weight of water, 4 to 12% by weight of thiourea, 1 to 4% by weight of urea, and 1 to 4% by weight of boric acid, It has the effect of adsorbing and deodorizing components such as volatile organic compounds (VOC) and formaldehyde, so it is harmless to the human body.

The thiourea (CH ₄ N ₂ S) is an organic compound composed of carbon, nitrogen, sulfur, hydrogen, etc., and is a colorless crystal, and has a structure in which an oxygen atom of urea is substituted with a sulfur atom, so thiourea thiocarbamay Thiourea has a molecular weight of 7312, a melting point of 180°C, and a specific gravity of 1405. It is soluble in water and ethanol, but almost insoluble in ether. The aqueous solution is neutral and has a bitter taste. When hydrolyzed with acid or alkali, it is decomposed into ammonia, hydrogen sulfide, and carbon dioxide, and when oxidized with potassium permanganate, it becomes urea, and the deodorization effect is excellent.

The urea (CO(NH ₂ ) ₂ ) is an organic compound, a colorless crystalline substance, and is the final degradation product of protein metabolism in all mammals and some fish, including urea, carbamide, and diaminomethanal. It has no color or odor and is a substance that makes columnar crystals, has a molecular weight of 60047, a melting point of 1327°C (1 atm), and a specific gravity of 1335. It is highly polar, so it is soluble in water and alcohol, but insoluble in ether.

The boric acid (H ₃ BO ₃ ) is an oxygen acid produced by hydration of boron oxide, and includes orthoboric acid, metaboric acid, tetraboric acid, and the like. Orthoboric acid is a raw material for borosilicate glass and ceramic glaze, and it also promotes the dissolution of injections. Orthoboric acid is colorless, transparent or flaky crystals with a white luster. It has no odor and has a unique taste. The melting point is 184~186℃, and the specific gravity is 149.

The nanofiber filter of the present invention removes volatile organic compounds (VOC), formaldehyde, acetaldehyde, miscellaneous odors, and can be used with confidence in any climatic conditions. , bacteria, viruses, etc. are killed in a short time.

The present invention may further include 1 to 10% by weight of an antibacterial material to be mixed with the water-based adhesive. The antibacterial material may be adipic dihydrazide (AHD), and the molecule is composed of 14 hydrogen atoms, 6 carbon atoms, 4 nitrogen atoms, and 2 oxygen atoms, so that a total of 26 atoms is formed.

Adipic dihydrazide molecule has a total of 25 chemical bonds, which are composed of 11 non-hydrogen bonds, 2 multiple bonds, 5 single bonds, 2 double bonds, and 2 N hydrazines. It is liquefied when mixed with powder or water-based adhesive, and it gives antibacterial function to the coated nanofiber filter and greatly contributes to reducing formaldehyde.

The present invention may further include a water-repellent solution of 2 to 8% by weight mixed with the water-based adhesive. The water-repellent liquid is an eco-friendly fluorine-based water-repellent liquid of C6 or less or a silicone-based water-repellent liquid.

Polyvinylidene fluoride (PVDF) or polyurethane (PU) of the present invention has its own water-repellent function, but by further including the water-repellent solution, the water-repellent power of the nanofiber filter is doubled.

In addition, the polyvinylidene fluoride (PVDF) and polyurethane (PU), which are electrospun when constituting the nanofiber layer 2, are ferroelectric materials and have their own static charge, as the static charge is increased by electrospinning. Fine dust and the like are more effectively captured.

Figure 4 is an image taken at a magnification of 5,000 times the nanofiber layer (2), Figure 5 is an image taken at a magnification of the nanofiber layer (2) 10,000 times.

In FIG. 5, it can be seen that the nanofiber yarns with diameters of 125.5 nm, 150.6 nm, 200.8 nm, and 251.0 nm and the surrounding nanofiber yarns are configured in the form of a web, and pores (nanocells) formed between the nanofiber yarns. ) is in the range of at least 50nm to 1㎛, and ventilation and respiration are achieved while the air enters and exits through the pores.

The nanofiber layer 2 has a basis weight of 0.05 to 0.5 gsm, and also has an air permeability of 80 to 150 cfm, so breathing is not burdensome or difficult.

The nanofiber yarn of the nanofiber layer 2 may have a diameter of 100 nm to 300 nm. When the diameter of the nanofiber yarn is larger than 300 nm, microfinement is not sufficient, the fiber surface area is lowered, and the collection efficiency as a filter material for a filter is lowered, so that it is difficult to remove fine dust, etc. There is a problem in that the pressure is lowered, the density is increased, the differential pressure is increased, the strength is decreased, and the production is difficult.

When the present invention is applied to a face mask and worn, not only air dust, fine dust, yellow dust, pollen, dust, etc., but also biologically transmitted (MERS / It can be usefully used as various filters, masks, coatings, etc. to remove SARS/Coronavirus Infectious Disease-19 (COVID-19) or harmful substances.

In addition, the colors of the first non-woven fabric layer 1 and the second non-woven fabric layer 3 may be implemented in various colors by selecting various colorants (pigments, dyes, etc.).

The polyvinylidene fluoride (PVDF) is a kind of fluororesin polymer and has excellent mechanical properties to make a high crystallinity resin. In addition, it has high dielectric constant and has special properties such as piezoelectricity.

Characteristics of polyvinylidene fluoride (PVDF) polymers include strong mechanical strength among fluororesins, particularly high abrasion resistance, excellent chemical resistance, and almost all chemicals except dimethylamine and acetone at room temperature. It is infringed on amines, esters and ethers. In addition, the deterioration of ultraviolet rays and radiation is small, the weather resistance and electrical insulation are excellent, and it has large piezoelectric properties. Although the dielectric constant is smaller than that of inorganic piezoelectric materials, the piezoelectric voltage strength is high, and because it is lightweight and flexible, it withstands shock bending well, and because the mechanical impedance is small, it is easy to match with water or living things. It does not destroy even with a large input. It has low dielectric constant and specific heat, high superconductivity, and low thermal diffusion coefficient, so it has excellent spatial resolution.

Polyvinylidene fluoride (PVDF) is used for mechanical parts such as barkings, gaskets, pipe joints, diaphragm containers, printed circuit boards, insulated terminals, socket condenser films, high-rise window frame sealing materials, plate materials, metal plate linings, speakers, Headphones, cartridges, ultrasonic microphones, ultrasonic microscopes, measurement sensors, strain gauges, pressure sensors, and the like may be exemplified.

The polyurethane (PU: polyurethane) is produced by the reaction of polyisocyanate (-NCO) and polyol (-OH), and due to the excellent physical properties of urethane, it is applied to various purposes such as adhesives, fillers, textile products, shoes, It is used to manufacture products that can always be found around our lives, such as beds, refrigerators, automobiles, sofas, building materials, and flooring materials. In addition, its application is expanding to eco-friendly and medical functional materials such as biofilters for organic waste treatment, blood and plasma filters, and wettable dressing materials.

In the present invention, the nanofiber layer 2 is obtained by electrospinning a polyvinylidene fluoride (PVDF) solution or a polyurethane (PU) solution.

Of course, the nanofiber layer 2 may be obtained by mixing and electrospinning a polyvinylidene fluoride (PVDF) solution and a polyurethane (PU) solution at an appropriate ratio.

On the other hand, the principle of electrospinning is that when an electric field is applied to a polymer solution, an electric force is applied to the particles, and positive charges are oriented on the surface of the solution to induce the particles to the interface between the air layer and the surface of the solution. A force opposite to the surface tension is generated. At this time, as the solution overcomes the surface tension above the threshold voltage, the solution injected by the potential difference with the metal collector on the opposite side is collected by the collector. According to this principle, it is possible to manufacture nanofibers through a polymer solution.

In the case of manufacturing a nanofiber web with polyvinylidene fluoride (PVDF) or polyurethane (PU) through the electrospinning method, after the polymer solution (+) sprayed in the electrospinning process is solidified, the electrode (integrator) (- The dipole arrangement (CF) inside the polyvinylidene fluoride (PVDF) or polyurethane (PU) fiber occurs at the same time by the electric field generated when the PVDF having a high β-crystal content can be prepared.

On the other hand, a typical MB filter (or HEPA filter) absorbs and collects dust in an electrostatic method, so it is weak to moisture or moisture, so when worn for a long time, performance deteriorates and shrinks. Because it blocks ultra-fine dust and viruses with a physical method that filters out the entangled fiber strands, it is hardly affected by moisture or moisture. there is an effect

In addition, polyvinylidene fluoride (PVDF) or polyurethane (PU), which is electrospun when constituting the nanofiber layer 2, is a ferroelectric material and has its own static charge, as well as the static charge is increased by electrospinning. Dust and the like are more effectively collected.

Table 1 below is a test result table for the amount of PBBs (Polybrominated biphenyls) detected for the nanofiber filter of the present invention, and it can be seen that various harmful components are detected below the detection limit, so that it is safe for use in the human body.

Test Items Result (unit: mg/kg) Test Methods detection limit Monobromobiphenyl less than 5



IEC 62321-6:2015 5 Dibromobiphenyl less than 5 5 Tribromobiphenyl less than 5 5 Tetrabromobiphenyl less than 5 5 Pentabromobiphenyl less than 5 5 Hexabromobiphenyl less than 5 5 Heptabromobiphenyl less than 5 5 Octabromobiphenyl less than 5 5 Nonabromobiphenyl less than 5 5 Decabromobiphenyl less than 5 5

Table 2 below is a test result table for PBDEs (Polybrominated diphenyl ethers) detection amount, and it can be seen that various harmful components are detected or not detected below the detection limit (less than 5 mg/kg), so it is safe to use on the human body.

Test Items Result (unit: mg/kg) Test Methods detection limit Monobromobiphenyl less than 5



IEC 62321-6:2015 5 Dibromobiphenyl less than 5 5 Tribromobiphenyl less than 5 5 Tetrabromobiphenyl less than 5 5 Pentabromobiphenyl less than 5 5 Hexabromobiphenyl less than 5 5 Heptabromobiphenyl less than 5 5 Octabromobiphenyl less than 5 5 Nonabromobiphenyl less than 5 5 Decabromobiphenyl less than 5 5

Table 3 below is a pralate detection amount test result table, and it can be seen that various harmful components are detected below the detection limit of 0.01%, indicating that it is safe to use on the human body.

Test Items Result (unit:%) Test Methods detection limit DEHP less than 0.01
IEC 62321-8:2017 0.01 BBP less than 0.01 0.01 DBP less than 0.01 0.01

* DEHP : DI(2-ETHYLHEXYL)-PHTHALATE

*BBP: BENZYLBUTYLPHTHALATE

* DBP: DIBUTYLPHTHALATE

Table 4 below is a test result table for the amount of formaldehyde detected.

Test Items Results (unit: mg/kg) Test Methods detection limit formaldehyde not detected KS K ISO 14184-1:1998 16 (mg/kg)

Table 5 below is a test result table for the amount of 8EO heavy metal detection, and it is detected (non-detected) below the detection limit, indicating that it is safe to use on the human body.

Test Items result
(Unit: mg/kg) Test Methods limit of quantification
(Unit: mg/kg) lead [Pb] non-detection



KS C ISO 8124-3 : 2010 5 Cadmium [Cd] non-detection 5 chromium [Cr] non-detection 2 antimony [Sb] non-detection 5 Arsenic [As] non-detection 2 barium [Ba] non-detection 5 selenium [Se] non-detection 5 mercury [Hg] non-detection 2

Table 6 below is a table of quantitative test results for other hazardous substances, and it can be seen that it is safe even when used in the human body because it is below the limit of quantitation or not detected.

Test Items result
(Unit: mg/kg) Test Methods limit of quantification
(Unit: mg/kg) Methylisothiazolinone
(MIT) non-detection Regulations on standards and methods for testing and inspection of household chemical products subject to safety verification [National Institute of Environmental Sciences Notice No. 2019-70 (2019.12.31.)] One Benzisothiazolinone
(BENZISOTHIAZOLIONE) non-detection One 2-octyl-3(2H)isothiazolone
(OIT) non-detection One 5-chloromethylisothiazolinone
(5-CHLOROMETHYLISOTHIAZOLIONE) non-detection National Academy of Environmental Sciences Notice No. 2019-70 (2019.12.31.) One

* Non-detection = less than the limit of quantitation

Table 7 below is a test result table for the detection amount of dimethylformamide, which is one of the polar organic solvents and is used as a solvent for various chemical reactions. It can be known that it is safe even if it is detected as a human body. The dimethylformamide (Dimethylformamide) is used as a spinning agent for synthetic fibers (紡絲溶劑), and stimulates the skin, eyes, and mucous membranes, and causes liver disorders when inhaled for a long time.

Test Items Results (unit: mg/kg) Test Methods detection limit formaldehyde less than 10 GC-MSD analysis 10 (mg/kg)

* Specimen extracted with methanol and analyzed by GC-MSD

According to the above Tables 4 to 7, the nanofiber filters prepared according to the examples of the present invention are heavy metals, volatile organic compounds (VOCs), volatile aromatic hydrocarbons (VACs), total volatile organic compounds (TVOC), toluene, formaldehyde It was found that all of the items were not detected or a trace amount was detected at a level that satisfies the certification standards. was satisfied.

Table 8 below is a table of UV blocking rate test results, and it can be seen that the UV blocking rate is excellent.

Test Items Result (unit: nm) measuring instrument Wavelength interval Ultraviolet (UV-R) blocking rate 65.8/47.8/58.2/52.3 UV-VIS-NIR Spectrophotometer
(Perkin Elmer_Lambda 1050 with 150 mm InGaAs int. Sphere) 5nm Ultraviolet (UV-A) blocking rate 58.5/40.7/51.0/44.8 5nm Ultraviolet (UV-B) blocking rate 90.0/70.6/84.2/76.7 5nm

* Wavelength range UV-R : 290~400nm, UV-A : 315~400nm, UV-B : 290~315nm

* Individual values are indicated due to the deviation of data for each part.

Table 9 below is the transmittance test result table of the nanofiber filter of the present invention. As a result of testing 3 times for 30 seconds using a filter tester (filter tester (Lorenz FMP03)) and aerosol type paraffin oil, the transmittance of the nanofiber filter was 2.7% and the filter efficiency was 97.3%, resulting in very good results.

transmittance 2.7% efficiency 97.3%

* Test equipment: filter tester (Lorenz FMP03)

* Aerosol form: paraffin oil

* Aerosol average particle size: 0.44㎛

* Aerosol concentration: (20±5) ㎎/㎥

* Flow rate: 95 L/min (min)

* Number of measurements: 3 times

* Measurement time: 30 seconds

* Efficiency: 100 - Transmittance (%)

In addition, the 'differential pressure', which is the pressure difference before and after passing through the nanofiber layer 2, is measured to be 1.4, indicating that breathing is very convenient. For example, among masks approved by the Ministry of Food and Drug Safety, in the case of KF-94 products, the differential pressure is about 7-8, and in the case of KF-80, the differential pressure is 6-7, making it difficult to breathe, whereas the present invention has a nanofiber filter that breathes about 1.4-5. comfortable.

Table 10 below is a test result table for liquid resistance, it can be seen that water does not penetrate into the nanofiber layer 2 within 30 parts. It can be seen that it is possible to block the droplets that become

Liquid resistance test method After putting 100ml of water in a 250ml beaker, place the sample on it with the lining facing the beaker and fix it using a rubber band or other tools.
Place the paper under the beaker and leave for 30 minutes. result No water penetration within 30 minutes

Table 11 below is the ammonia deodorization performance test result table, and it can be seen that the deodorization rate is excellent at 10.8%.

Test Items Result (unit: %) Test Methods ammonia 10.8 gas detection tube method
(FITI Test Guideline FTM-5-2:2004)

* Test piece: 100cm2 (10cm × 10cm)

* Gas bag: 5L

* Gas volume in gas bag: 3L

* Measurement time: after 2 hours

* Initial concentration: ammonia (100 ppm)

* Deodorization rate (%) : ((Cb - Cs)/(Cb) × 100

- Cb: BLANK, concentration of test gas remaining in test gas bag after 2 hours

- Cs: the concentration of the test gas remaining in the test gas bag after 2 hours of the sample

Table 12 below shows the antimicrobial test in the state that the antimicrobial function is given by including 1 to 10% by weight of adipic dihydrazide (AHD: ADIPIC DIHYDRAZIDE), which is an antibacterial substance, in the water-based adhesive of the present invention (KS K0693) : 2016) As a result table, the sample used for the antimicrobial test is the nanofiber layer (2) of the nanofiber filter, and 0.05% of the nonionic surfactant was added to the bacterial solution of the test strains 1 and 2 to increase the antimicrobial degree. tested.

division Bacteria immediately after inoculation Number of bacteria after 18 hours bacteriostatic reduction rate strain 1 Sample (BLANK) 1.8 × 10 ⁴ /ml 8.7 × 10 ⁶ /ml - Nanofiber filter of the present invention - <10/ml 99.9% strain 2 Sample (BLANK) 1.8 × 10 ⁴ /ml 3.0 × 10 ⁷ /ml - Nanofiber filter of the present invention - 1.2 × 10 ⁴ /ml 99.9%

In Table 12, 'Strain 1' is Staphylococcus aureus ATCC 6538, 'Strain 2' is Klebsiella pneumonian ATCC 4352, standard cloth is 'Nanofiber layer (2)', and nonionic surfactant is TWEEN 80 inoculated with 0.05 % is added, and '<' means less than the value.

6 and 7 are antibacterial test pictures for strain 1 (Staphylococcus aureus ATCC 6538), FIG. 6 is a bacterial solution (1.8×10 ⁴ ) of the sample (Blank), and FIG. As a result, the number of bacteria in 'Strain 1' was less than 10 and 99.9% were removed, indicating that the antibacterial degree is very good.

8 and 9 are antibacterial test pictures for strain 2 (Klebsiella pneumonian ATCC 4352), FIG. 8 is a bacterial fluid (1.8×10 ⁴ ) of the sample (Blank), and FIG. As a result, it can be seen that the number of bacteria in 'Strain 2' is 1.2×10 ⁴ and 99.9% is removed, indicating that the antibacterial degree of the nanofiber filter of the present invention is very good.

As can be seen from the above antibacterial test results, in the case of the 'Nanofiber Layer (2)' sample containing the antibacterial substance ADIPIC DIHYDRAZIDE (AHD: ADIPIC DIHYDRAZIDE), the initial number of bacteria in strains 1 and 2 was 1.8 × 10 ⁴ , but almost all were removed after 18 hours, and it can be seen that the antibacterial degree is very good.

According to the present invention, various kinds of bacteria, pathogens, microorganisms, viruses, etc. are killed in a short time by the antibacterial action of ADIPIC DIHYDRAZIDE (AHD: ADIPIC DIHYDRAZIDE), which is harmless to the human body and environmentally friendly, so various things can be safely used. .

The adipic dihydrazide (AHD: ADIPIC DIHYDRAZIDE) maintains very excellent antibacterial and sterilizing power, and is very economical because it is antibacterial and sterilized without physical or electrical sterilization or washing.

The nanofiber filter according to the present invention is applied to various electronic products such as face-wearing masks, clothing, dust-proof clothes, protective clothing, dust-proof nets, air purifiers, air conditioners, automobiles, ventilation air filters, transport air filters, industrial filters, clean room facilities, etc. It can be used, and the range of its use is not limited within the area of the air filter.

The present invention described as described above is not limited to the present embodiment and the accompanying drawings, and various substitutions, modifications and changes are possible within the scope without departing from the technical spirit of the present invention, which in the technical field to which the present invention pertains It is obvious to those with ordinary knowledge.

(1)--First non-woven fabric layer (2)--Nanofiber layer (3)--Second nonwoven layer

Claims (10)

a) introducing a first nonwoven layer into an electrospinning device;
b) electrospinning any one of a polyvinylidene fluoride (PVDF) solution or a polyurethane (PU) solution on the first nonwoven fabric layer to form a nanofiber layer;
c) rough coating of an eco-friendly water-based adhesive on the upper surface of the nanofiber layer and the lower surface of the second non-woven fabric layer with a roller;
d) winding the nanofiber layer and the second nonwoven fabric layer on a paper tube or a drum, respectively, and then leaving it at room temperature for 2 to 6 hours to permeate the water-based adhesive with the rough coating to permeate into the nanofiber layer and the second nonwoven fabric layer;
e) finishing coating an eco-friendly water-based adhesive on the upper surface of the nanofiber layer with a roller;
f) thermocompression bonding and bonding by passing the first nonwoven fabric layer and the nanofiber layer coated with an eco-friendly water-based adhesive finish and the second nonwoven fabric layer between the upper and lower rollers heated to a temperature of 60 to 90°C;
g) complete drying at room temperature for 24-96 hours;
A method for manufacturing a nanofiber filter using a nonwoven fabric comprising a. a`) rough coating of an eco-friendly water-based adhesive on the upper surface of the first non-woven fabric layer with a roller;
b`) natural drying at room temperature so that the moisture content of the first non-woven fabric layer coated with the rough coating is maintained at 40-60%;
c`) putting the first nonwoven layer into the electrospinning device;
d`) electrospinning any one of a polyvinylidene fluoride (PVDF) solution or a polyurethane (PU) solution on the first nonwoven layer to form a nanofiber layer;
e`) coating the top surface of the nanofiber layer and the bottom surface of the second non-woven fabric layer with an eco-friendly water-based adhesive with a roller;
f`) the nanofiber layer and the second nonwoven layer are wound on a paper tube or drum, respectively, and then left at room temperature for 2 to 6 hours to permeate the water-based adhesive coated with the chaebol to permeate into the nanofiber layer and the second nonwoven layer;
g`) finishing coating an eco-friendly water-based adhesive on the upper surface of the nanofiber layer with a roller;
h`) passing the nanofiber layer and the second nonwoven fabric layer between the upper and lower rollers heated to a temperature of 60 to 90° C., followed by thermocompression bonding and bonding;
i`) completely drying at room temperature for 24 to 96 hours to obtain a nanofiber filter;
A method for manufacturing a nanofiber filter using a nonwoven fabric comprising a. The method according to claim 1 or 2;
Instead of step g) or i`) to obtain a nanofiber filter by drying completely at room temperature for 24 to 96 hours, heat and dry the nanofiber filter for 12 to 24 hours in a drying room at 60 to 90 ° C, and then completely dry it at room temperature for 12 to 24 hours. to obtain;
A method for manufacturing a nanofiber filter using a nonwoven fabric comprising a. The method according to claim 1 or 2;
A method for manufacturing a nanofiber filter using a nonwoven fabric, characterized in that the coating amount of the water-based adhesive is 8 to 30 g/m 2 . The method according to claim 1 or 2;
water-based adhesive,
5 to 15% by weight of water, 10 to 22% by weight of an aqueous EVA copolymer, 65 to 75% by weight of an aqueous acrylic copolymer, and 2 to 5% by weight of a VOC reducing agent A method for manufacturing a nanofiber filter using a nonwoven fabric. 6. The method of claim 5;
The VOC reducing agent,
69 to 90% by weight of water, 4 to 12% by weight of thiourea, 1 to 4% by weight of urea, and 1 to 4% by weight of boric acid. 6. The method of claim 5;
A method for manufacturing a nanofiber filter using a nonwoven fabric further comprising 1 to 10% by weight of adipic dihydrazide (ADIPIC DIHYDRAZIDE). 6. The method of claim 5;
Further comprising 2 to 8% by weight of a water-repellent solution,
The water-repellent liquid is a nanofiber filter manufacturing method using a nonwoven fabric, characterized in that the water-repellent liquid is either an eco-friendly fluorine-based water-repellent liquid or a silicone-based water-repellent liquid. A nanofiber filter using a nonwoven fabric manufactured by the manufacturing method of any one of claims 1 to 8. a first nonwoven layer;
a nanofiber layer electrospun and bonded to a solution of either polyvinylidene fluoride (PVDF) or polyurethane on the upper surface of the first nonwoven fabric layer;
a second nonwoven layer adhered to the upper surface of the nanofiber layer; including,
The air permeability of the nanofiber layer is 80 to 150 cfm,
The basis weight of the nanofiber layer is 0.05 ~ 0.5gsm,
The basis weight of the first nonwoven layer is 10-50 gsm,
The second non-woven fabric layer has a basis weight of 10 to 100 gsm nano-fiber filter using a non-woven fabric.

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