KR20180007817A - 2-layer filter for blocking fine and yellow dust containing nanofiber web and its manufacturing method - Google Patents

Abstract

The present invention relates to a filter for blocking fine dust. The filter for blocking fine dust of the present invention comprises: a carrier; and a nanofiber web stacked on one side of the carrier and having a plurality of micropores formed by electrospinning a polymer spinning solution. The filter for blocking fine dust has excellent filtering efficiency and has excellent visibility and permeability.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a two-layer fine dust blocking filter including a nanofiber web,

More particularly, the present invention relates to a filter employing a nanofiber web produced by electrospinning, and a method of manufacturing the filter.

With the development of the industry and the increase in the use of fossil fuels, the incidence of fine dust increases and the damage is becoming serious. In general, fine dust refers to particulate matter having a diameter of 10 mu m or less, and can be classified into fine dust (PM10), minute fine dust (PM2.5), and ultrafine fine dust (PM1). Here, the fine dust particles PM10, the fine dust particles PM2.5, and the ultra fine dust particles PM1 mean the contamination degree by measuring the mass concentration of the particulate matter having a particle diameter of about 10 μm, 2.5 μm, do. Such fine dusts are mainly caused by artificial factors such as combustion of fossil fuels rather than natural ones. Exposure to such fine dusts can cause various diseases such as respiratory diseases, skin diseases, and acute allergies. Accordingly, there is an increasing interest in window-type ventilation and air purification filters that can prevent contaminated outside air such as fine dust and dust from entering the room, and purify the contaminated air in the room.

In order to effectively block the entry of fine dust or dust into the room, a filter capable of collecting ultrafine particles has been developed. However, the development of a filter having excellent visibility and air permeability, It is insufficient.

Japanese Published Patent Application No. 2011-245423 Korean Patent Publication No. 2016-0001905

An object of the present invention is to provide a filter including a nanofiber web excellent in visibility and breathability while effectively shielding fine dust, ultrafine dust, ultrafine dust, yellow dust, and soot.

In order to solve the above-mentioned problems, And a nanofiber web laminated on one side of the carrier and having a plurality of micropores formed by electrospinning the polymer spinning solution. The polymer for forming the nanofiber web used in the polymer spinning solution is preferably polyurethane, polyacrylonitrile, polyvinylidene fluoride, polyamide, nylon, polyethersulfone, polyamic acid, polyimide and the like. The carrier constituting the filter for blocking fine dust of the present invention is one kind selected from the group consisting of a polyester carrier, a polyurethane carrier and a nylon carrier and has a basis weight of 10 to 50 g / m 2, The basis weight of the nanofiber web is 0.001 to 2.0 g / m < 2 >.

  The filter for blocking fine dust according to the present invention is characterized by having a DOP filtration efficiency of 80% or more and a flame retardancy index of 25 or more for particles having a light transmittance of 30 to 80%, an air permeability of 10 to 500 CFM, .

According to a preferred embodiment of the present invention, the polyurethane nanofiber web is produced by electrospinning the polymer spinning solution through a nozzle at a high temperature of 45 to 120 DEG C by using a temperature control device. For example.

According to another preferred embodiment of the present invention, the electrospinning is constituted by two or more electrospinning apparatuses, in which the up-down type and the down-type or down-type and the bottom-up type electrospinning apparatus are alternately arranged, And the polyurethane nanofiber web is continuously laminated on one surface of the substrate by rotating the laminate.

According to another preferred embodiment of the present invention, the carrier is treated with a flame retardant.

According to another preferred embodiment of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: preparing a carrier; Laminating a nanofiber web by electrospinning a polymer spinning solution on the carrier; And attaching the carrier and the nanofiber web layer to each other. The step of attaching the carrier and the nanofiber web layer may include attaching the nanofiber web layer by one or more methods selected from the group consisting of ultrasonic bonding, chemical bonding, and thermal bonding. The step of laminating the nanofiber web on the carrier may include applying an adhesive on the carrier, and then electrospinning the polymer spinning solution.

According to another preferred embodiment of the present invention, in the step of laminating the nanofiber web by electrospinning the polymer spinning solution, the electrospinning is carried out by using a temperature control device so that the polymer spinning solution is sprayed through the nozzle at a high temperature of 45 to 120 DEG C Wherein the filter is made of a metal.

According to another preferred embodiment of the present invention, in the step of laminating the nanofiber web by electrospinning the polymer spinning liquid on the carrier, the polymer spinning solution is electrospun onto the one surface of the carrier by the top-down electrospinning device, Stacking a web; The laminate having the first nanofiber web laminated thereon is rotated 180 degrees with the upper surface passing through the rotating device to the lower surface; And a step of sequentially laminating a second nanofiber web by electrospinning a polymer spinning solution with a bottom-up electrospinning device on the first nanofiber web. do.

The fine dust barrier filter of the present invention can effectively block various fine dusts, ultrafine dusts, yellow dust, etc. by using a nanofiber web, and can have excellent visibility, air permeability, and ease of use.

1 is a side view schematically showing an apparatus for producing nanofibers according to the present invention,
2 is a plan view schematically showing a nozzle block installed in each electrospinning device of the nanofiber manufacturing apparatus of the present invention,
3 is a front sectional view schematically showing a state in which a heating wire for temperature control is installed in a nozzle block installed in each electrospinning device of the nanofiber manufacturing apparatus of the present invention,
4 is a sectional view taken along line AA in Fig. 3,
5 and 6 are cross-sectional views schematically showing a flip device used as an embodiment of a rotating device of a nanofiber manufacturing apparatus of the present invention,
Fig. 7 is a side view schematically showing the arrangement of the apparatus for producing nanofibers of the present invention in a vertical direction, Fig.
Fig. 8 is a bird's-eye view schematically showing the arrangement of a case where the apparatus for producing nanofibers of the present invention is arranged in U-shape with respect to the horizontal direction.
9 is a cross-sectional view of the filter for blocking fine dust particles according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the scope of the present invention, but is merely an example, and various modifications can be made without departing from the technical spirit of the present invention.

2 is a plan view schematically showing a nozzle block installed in each electrospinning apparatus of the nanofiber manufacturing apparatus of the present invention. FIG. 2 is a cross- 3 is a front sectional view schematically showing a state in which a heating wire for temperature control is installed in a nozzle block installed in each electrospinning device of the nanofiber manufacturing apparatus of the present invention, FIG. 4 is a sectional view taken along line AA in FIG. 3, 6 is a cross-sectional view schematically showing a flip device 20-1, which is an embodiment of a rotating device 20 used in the nanofiber manufacturing apparatus of the present invention. FIG. 7 is a cross- And FIG. 8 is a side view schematically showing a case where the nanofiber manufacturing apparatus of the present invention is arranged in a U-shape with respect to the horizontal direction. It is a bird's-eye view that I took. 9 is a cross-sectional view of the filter for blocking fine dust particles according to the present invention.

In the present invention, it is general to use a nanofiber manufacturing apparatus composed only of a bottom-up electrospinning device 10, but as shown in the figure, the nanofiber manufacturing apparatus 1 according to an embodiment of the present invention includes a bottom- A top and bottom type electrospinning device 10 and a top-down or bottom-type electrospinning device 30 are arranged at regular intervals.

The top-down or bottom-up electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30 discharge the polymer spinning solution in the spinning solution main tanks 11 and 31 in which a polymer spinning solution (not shown) A nozzle block 13, 33 in which a plurality of nozzles 15, 35 in a pin shape are arranged, an upper end (in the case of a top-down or bottom-up electrospinning device) and a bottom (In the case of an electrospinning device), collectors 17, 37 spaced from the nozzles 15, 35 by a predetermined distance and collectors 17, And a generating device 14.

According to the structure as described above, the nanofiber manufacturing apparatus 1 according to the present invention can be used in the spinning liquid main tanks 11 and 31 of the top-down or bottom-up electrospinning apparatus 10 and the bottom- The spinning solution to be filled is continuously supplied in a constant quantity in the plurality of nozzles 15 and 35 to which a high voltage is applied through the metering pump and the polymer spinning solution supplied to the nozzles 15 and 35 is supplied through the nozzles 15 and 35 The nanofibers are spin-coated and collected on the collectors 17 and 37 with voltage applied thereto to form a nanofiber web, and the formed nanofiber web is embossed or needle-punched into a nonwoven fabric. The present invention is characterized in that a support 3 on which a nanofiber web is laminated on a collector is directly used as a carrier so that the nanofiber web is directly electrified on the carrier to form a laminate. The carrier is generally used as a substrate and is preferably one selected from the group consisting of a polyester carrier, a polyurethane carrier and a nylon carrier. The monofilament or the monofilament It is also possible to use a low melting point nonwoven fabric. In the present invention, the basis weight of the carrier is preferably 10 to 50 g / m < 2 >. If the basis weight is less than 10 g / m < 2 >, the physical properties of the base material are poor. When the basis weight exceeds 50 g / m < 2 >, the stiffness is high, .

On the other hand, the nozzle blocks 13 and 33 in which the nozzles 15 and 35 are disposed in the respective electrospinning devices are provided with a temperature control device 60 in each tube 112. That is, in order to adjust the temperature of the polymer spinning solution in the tubular body of the nozzle blocks 13 and 33 provided in the respective electrospinning devices 10 and 30 and supplied with the polymer spinning solution by the plurality of nozzles 15 and 35, A temperature control device is provided. Here, the flow of the polymer spinning solution in the nozzle blocks 13 and 33 is supplied from the spinning liquid main tanks 11 and 31 in which the polymer spinning solution is stored to each tube through a spinning solution flow pipe (not shown). The polymer spinning solution supplied to each tube is radiated and discharged through a plurality of nozzles 15 and 35, and is accumulated on the support 3 in the form of a nanofiber web. At this time, the plurality of nozzles (15, 35), which are spaced apart from each other at a predetermined interval in the longitudinal direction, are mounted on the tubular body in a state of being electrically connected and electrically connected. Here, the temperature controller 60 is provided in the shape of a heat ray 113 on the inner circumference of the tube to control the temperature control of the polymer solution for supplying and flowing into the tubes. 3 to 5, a temperature regulating device 60 composed of a hot wire is formed on the periphery of the inside of the tubular body of the nozzle blocks 13 and 33 in a spiral manner on the inner circumference of the tubular body of the nozzle blocks 13 and 33 Thereby controlling the temperature of the polymer spinning solution supplied and introduced into the tubular body. In the present invention, it is common to spin at room temperature, but it is also possible to spin at a high temperature, preferably 45 to 120 ° C.

In an embodiment of the present invention, a temperature regulating device 60 consisting of a hot line is spirally arranged on the inner circumference of the tubular body of the nozzle blocks 13 and 33. However, the temperature regulating device 60 is formed in a hot line shape, The temperature regulating device (60) may be formed in a substantially C-shaped tube shape, and the inner circumference of the tube may be formed with a plurality of longitudinally arranged radial inner radii of the tubular body so as to control the temperature of the polymer solution. So that the temperature of the polymer spinning solution can be controlled.

A top-down or bottom-down electrospinning device 10 is disposed at a front end of the nanofiber manufacturing apparatus 1, and a bottom-up or bottom-down electrospinning device 30 is disposed at a rear end thereof. A feed roller 5 for feeding a support 3 on which nanofibers are laminated and a winding roller 5 for winding a support 3 on which nanofibers are laminated are provided at the rearmost end of the nanofiber manufacturing apparatus 1 9 are provided.

In the present invention, as described above, a carrier is used as a support. Preferably, the carrier is one selected from the group consisting of a polyester carrier, a polyurethane carrier, and a nylon carrier. Characterized in that it is composed of monofilaments or multifilaments, and it is also possible to use a low melting point nonwoven fabric.

The top-down or bottom-down electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30 of the present invention are arranged symmetrically with respect to the collectors 17 and 37 in the upward and downward directions, respectively. That is, in the top-down or bottom-up electrospinning apparatus 10, the collector 17 is located at the top of the nozzle 15, and the bottom-up or top-down electrospinning apparatus 30 is arranged such that the collector 37 is located at the bottom of the nozzle 35 Located.

On both sides of the collectors 17 and 37, conveying rollers 7 are provided and the nano-fibers are stacked on the respective collectors 17 and 37 via the conveying rollers 7, (3) is transported in the horizontal direction. That is, nanofibers prepared by laminating the polymer spinning solution injected from the nozzles 15 of the top-down or bottom-up electrospinning device 10 on the support 3 of the collector 17 can be used as a bottom- 30 on the collector 37 and conveying rollers 7 for repeatedly and continuously advancing the above-described process are provided at both ends of the respective collectors 17, 37, respectively.

In the meantime, the present invention is characterized in that a rotary device 20 is provided between a top-down or bottom-up electrospinning device 10 and a bottom-up or top-down electrospinning device 30. The rotating device 20 is disposed between the electrospinning devices and rotates the supporting body 3 by 180 degrees so that the upper surface of the support body is rotated to the lower surface and the lower surface is rotated to the upper surface to be.

5 and 6 are cross-sectional views schematically showing a flip device 20-1 used as an embodiment of a rotating device. 5 is a cross-sectional view showing an initial operation of the flip device 20-1, and FIG. 6 is a cross-sectional view showing a process of the flip device 20-1 in the latter stage of operation.

The flip device 20-1 used as an embodiment of the rotating device is formed as a cylindrical body having a hollow inside and is provided at its central portion with both ends of the support 3 inserted in the horizontal both- Left and right guide members 21 and 21 having guide grooves are formed so as to protrude inwardly. The left guide member 21 of the left and right guide members 21 and 21 formed to protrude inwardly from the inner periphery of the flip device 20-1 is formed to extend upward along the inner periphery, So that the right guide member 21 is extended in the downward direction along the inner periphery and then spirally rotated so as to extend upward in the upward direction And is located at the initial position and direction of the left guide member 21. [

The one end and the other end of the support inserted into the guide grooves 22 and 22 of the left and right guide members protruding inwardly from the inner periphery of the flip device 20-1 by the above- The upper and lower surfaces of the support body 3 are reversed by rotating the inner periphery of the flip device 20-1 in a spiral manner so as to face each other while being guided by the right guide members 21 and 21.

In the present invention, the flip device 20-1 is used as the rotating device 20 for rotating the electrospun nanofibers 180 degrees between the electrospinning devices. However, the present invention is not limited to this, and a device having a twist roller It is also possible to use an apparatus that rotates by 90 degrees in the advancing direction of the support by the torsion roller.

The polymeric spinning solution filled in the spinning liquid main tank 11 of the top-down or bottom-up electric device 10 is injected through the nozzle 15 onto the support 3 of the collector 17 or onto the base material The support (3) or the substrate on which nanofiber webs are laminated to form nanofiber filter media after lamination of nanofiber webs are stacked on the support (3) of the collector (17) The lower surface of the support 3 on which the nanofibers are laminated by the top-down or top-down electrospinning is rotated 180 degrees by the rotation device 20 to the upper surface. And then transferred onto the collector 37 of the bottom-up or top-down electrospinning device 30 via the transport roller 7 and the support 3, on which the nanofibers transferred onto the collector 37 are laminated, The polymer spinning solution filled in the spinning liquid main tank 31 of the top-down electrospinning device 30 is electrospun through the nozzle 35, and the above-mentioned process is continuously and repeatedly performed to produce the final product.

The nano-fiber manufacturing apparatus 1 according to the present invention has the structure as described above. The nano-fiber manufacturing apparatus 1 includes a top-down or bottom-up electrospinning apparatus 10, a rotating apparatus 20, and a nano- The fibrous web is injected into the support 3 through the nozzles 15 and 35 of the top-down or bottom-up electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30, The polymer spinning solution which is sprayed from the nozzles 15 and 35 of the top-down or bottom-up electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30 such that the nanofibers are continuously laminated on one surface of the support 3 And the nanofibers are formed in multiple layers.

According to an embodiment of the present invention, the voltage of the top-down or bottom-up electrospinning apparatus is higher than the voltage of the bottom-up or top-down electrospinning apparatus so that the diameter of the nanofibers produced by the top- It is possible to fabricate the nanofibrous web with a diameter smaller than the diameter of the nanofiber web produced by the top-down electrospinning device 30.

In the meantime, it is possible to fill the spinning liquid main tanks 11 and 31 of the top-down or bottom-up electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30 with the same type of polymer spinning solution, The nanofibers produced through the nanofiber manufacturing apparatus 1 can be variously manufactured according to the characteristics by filling the polymer spinning solution.

In the present invention, the polymer spinning solution injected from the top-down or bottom-up electrospinning device 10 and the polymer solution injected from the bottom-up or top-down electrospinning device 30 can be made of the same or different kinds of polymer spinning solution.

Examples of the polymer for forming nanofibers that can be used in the polymer spinning solution include, but not limited to, polypropylene (PP), polyethylene terephthalate (PET), polyvinylidene fluoride, nylon, polyvinyl acetate , Poly (methyl methacrylate), polyacrylonitrile (PAN), polyurethane (PUR), meta-aramid, polyamideimide, polyetherimide, polybutylene terephthalate (PBT), polyvinyl butyral, (PEI), polycaprolactone (PCL), polyvinyl alcohol (PVA), polyethyleneimine (PEI), polyethyleneimine (PVA), polyethylene naphthalate ), Polylactic acid (PLGA), silk, cellulose, chitosan and the like. Among them, polypropylene (PP) material and heat-resistant polymer material such as polyamide, polyimide, poly Aromatic polyesters such as polyimide, imide, imide, poly (meta-phenylene isophthalamide), polysulfone, polyether ketone, polyetherimide, polyethylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate and the like, polytetrafluoroethylene , Polyphosphazenes such as polydiphenoxaphospazene and polybis [2- (2-methoxyethoxy) phosphazene], polyurethane copolymers including polyurethane and polyether urethane, cellulose acetate, cellulose acetate Butyrate, cellulose acetate propionate, and the like are preferably used in a commercial manner.

Examples of the polymer that can be preferably used in the present invention include polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), polyethersulfone (PES), polyimide (PI) One or two selected from the group consisting of polyamic acid (PAA), nylon, polyurethane (PU), meta-aramid, inorganic polymer and polyetherimide (PEI) It is desirable to be species.

Hereinafter, preferred polymers will be described.

First, polyacrylonitrile (PAN) refers to a polymer of acrylonitrile (CH2 = CHCN), and polyacrylonitrile resin is a copolymer made from a mixture of acrylonitrile and a monomer, which constitutes the majority. Frequently used monomers include butadiene styrene vinylidene chloride or other vinyl compounds. The acrylic fiber contains at least 85% acrylonitrile, and the mode acrylic contains 35 to 85% acrylonitrile. When other monomers are included, the fiber has the property of increasing the affinity to the dye. More specifically, in the production of an acrylonitrile-based copolymer and spinning solution, in the case of producing an acrylonitrile-based copolymer, there is little contamination of nozzles in the course of manufacturing ultrafine fibers by electrospinning, Thereby increasing the solubility in the solvent and imparting better mechanical properties. In addition, polyacrylonitrile has a softening point of 300 ° C or more and is excellent in heat resistance.

The degree of polymerization of the polyacrylonitrile is preferably 1,000 to 1,000,000, and more preferably 2,000 to 1,000,000. When the weight average molecular weight of the polyacrylonitrile is less than 1,000, sufficient physical properties to obtain a nonwoven fabric can not be obtained. If the weight average molecular weight exceeds 1,000,000, the handling of the solution is not easy and the uniformity of the nanofiber nonwoven fabric It is difficult to obtain.

The polyacrylonitrile is preferably used within a range that satisfies the use amount of the acrylonitrile monomer, the hydrophobic monomer and the hydrophilic monomer. When the polymer is polymerized, the weight% of the acrylonitrile monomer is too low to be electrospun when the weight% of the hydrophilic monomer and the weight% of the hydrophobic monomer are 3: 4 and the total monomer is less than 60, It is difficult to form a stable jet (JET) at the time of electrospinning as well as to cause contamination of the nozzle. If the ratio is more than 99, the spinning viscosity is too high to spin, and even if an additive capable of lowering the viscosity is added, the diameter of the microfine fibers becomes too large and the productivity of electrospray is too low to achieve the object of the present invention.

In addition, as much amount of comonomer is added to the acrylic polymer, the amount of crosslinking agent must be increased to secure the stability of electrospinning and to prevent deterioration of the mechanical properties of the nanofiber.

The hydrophobic monomer may be an ethylene-based compound such as methacrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, vinyl acetate, vinyl pyrrolidone, vinylidene chloride or vinyl chloride, It is preferable to use at least one selected.

Wherein the hydrophilic monomer is selected from the group consisting of acrylic acid, allyl alcohol, methallyl alcohol, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, butanediol monoacrylate, dimethylaminoethyl acrylate, butent ricarboxylic acid, vinyl It is preferable to use at least one selected from ethylene-based compounds such as sulfonic acid, allylsulfonic acid, methallylsulfonic acid, and para-styrenesulfonic acid and polyvalent acids or derivatives thereof.

As the initiator to be used for preparing the acrylonitrile-based polymer, an azo-based compound or a sulfate compound may be used, but it is generally preferable to use a radical initiator used for the oxidation-reduction reaction.

 On the other hand, polyvinylidene fluoride (PVDF) is one of the fluorine-based polymers, and the fluororesin contains fluorine, which is excellent in thermal and chemical properties.

(Preparation of polyvinylidene fluoride)

The polyvinylidene fluoride is prepared in the same manner as in the above Reaction Scheme 1, and the vinylidene chloride monomer is prepared by free radical vinyl polymerization to produce polyvinylidene fluoride.

In addition, polyvinylidene fluoride has lower melting point, lower density, lower cost, and more chemical stability than other fluorinated resins, and is used for electric insulators and high-grade paints applied to the exterior walls of buildings.

Polyvinylidene fluoride is a representative organic material exhibiting piezoelectricity, and many studies have been conducted since the 1960s. In the polyvinylidene fluoride polymer, four kinds of crystals are mixed, and it is divided into at least four types of α, β, γ and δ type depending on crystal form. Among them, the? -Form crystal of polyvinylidene fluoride has a trans-type molecular chain filled in parallel, and all the permanent dipoles of the monomers are aligned in one direction, and exhibit large spontaneous polarization. This means that the polyvinylidene fluoride molecules can be regularly arranged through stretching to give piezoelectricity by giving anisotropy to the aggregated state. In order to improve such piezoelectric characteristics, various methods for increasing the? -Form crystal in the polyvinylidene fluoride fiber have been studied. In general, melt spinning systems have been applied to produce polyvinylidene fluoride fibers. However, it is expensive to construct melt spinning equipment, and the size of fibers produced by melt spinning is limited.

Due to the coagulation mechanism of wet spinning, fibers prepared by wet spinning have a significantly higher β-form crystal ratio in the fiber at the initial stage of spinning than the α-form crystal ratio, and the spinning speed is slower than the melt spinning. However, It also has the advantage of reducing fiber size. In addition, wet spinning has the advantage of improving physical properties through continuous post-treatment processes (stretching, crimping, etc.).

For wet spinning, the polymer is dissolved in a solvent to make a spinning solution, and the spinning solution is discharged through a gear pump and spinning nozzle into a coagulation bath containing an aqueous solution containing a solvent. As the discharged spinning liquid phase and the co-diffusion with the solvent and the precipitating agent in the coagulating bath occur, the precipitating agent penetrates into the spinning liquid phase and phase separation and precipitation occur in the three-component system of the polymer-solvent-precipitating agent, Is obtained. Such a wet spinning system has the advantage of enhancing the mechanical properties of fibers by orienting the polymer in a fiber direction by stretching and tensioning in a spinning bath.

The polyvinylidene fluoride may be a homopolymer of vinylidene fluoride or a copolymerized polymer containing vinylidene fluoride in a molar ratio of 50% or more in preparing a spinning liquid in which the polyvinylidene fluoride is dissolved in an appropriate organic solvent It is more preferable that the homopolymer is excellent in strength of the polyvinylidene fluoride resin. When the polyvinylidene fluoride resin is a copolymer polymer, as the other copolymerizable monomer copolymerized with the vinylidene fluoride monomer, And a fluorine-based monomer, a chlorine-based monomer, and the like can be suitably used. The weight average molecular weight (Mw) of the polyvinylidene fluoride resin is not particularly limited, but is preferably 10,000 to 500,000, more preferably 50,000 to 500,000.

When the weight average molecular weight of the polyvinylidene fluoride resin is less than 10,000, sufficient physical properties for forming a nonwoven fabric can not be obtained. When the weight average molecular weight exceeds 500,000, the solution is not easily handled, It is difficult to obtain a nonwoven fabric.

 Polyethersulfone (PES) is an amber transparent, non-crystalline resin having the following repeating units, and is generally produced by condensation polymerization of dichlorodiphenylsulfone.

(A unit of polyethersulfone)

Polyethersulfone is a super heat resistant engineering plastic developed by ICI in the UK. It is a highly heat resistant polymer among thermoplastic plastics. Since the polyethersulfone is amorphous, the physical properties of the polyether sulfone are not lowered by temperature rise, and the temperature dependency of the flexural modulus is small, so that it hardly changes at -100 to 200 캜. The load-strain temperature is 200 to 220 占 폚, and the glass transition temperature is 225 占 폚. In addition, the creep resistance of up to 180 is the most excellent among the thermoplastic resins, and has the property of enduring resistance to hot water and steam of 150 to 160 ° C. Due to the above characteristics, polyethersulfone is used in optical disks, magnetic disks, electric and electronic fields, hydrothermal fields, automobile fields, and heat resistant paints.

The molecular weight of the polyethersulfone is preferably from 8,000 to 200,000, and more preferably from 10,000 to 100,000, in terms of the viscosity average molecular weight. Examples of the solvent include dichloromethane, chloroform, tetrahydrofuran, methanol, ethanol, butanol, toluene, xylene, acetone, ethyl acetate, dimethylformamide, N- But are not limited to these.

On the other hand, polyimide is a polymer containing an imide group in a repeating unit and has a characteristic that the physical properties do not change even in a temperature range from -273 DEG C to 400 DEG C, and has excellent mechanical strength and heat resistance. However, most of the polyimides are insoluble and have poor physical properties and are difficult to process by conventional techniques, so it is common to process them in the form of its precursor poly (amic acid) (PAA). Therefore, the polyimide is prepared by first polymerizing a polyamic acid and then carrying out an imidation process.

Generally, polyimides are prepared by a two step reaction.

The first step is a step of synthesizing polyamic acid. The polyamic acid is polymerized by adding a dianhydride to a reaction solution in which diamine is dissolved. In order to increase the degree of polymerization, the reaction temperature, the water content of the solvent, Purity control is required. Organic polar solvents such as dimethylacetamide (DMAc), dimethylformamide (DMF) and en-methyl-2-pyrrolidone (NMP) are mainly used as the solvent used in this step. Examples of the diamine include 4,4'-oxydianiline (ODA), para-phenylene diamine (p-PDA), and o-phenylene diamine diamine, o-PDA) may be used. Examples of the anhydride include pyromellitic dianhydride (PMDA), benzophenonetetracarboxylic dianhydride (BTDA), 4-4'-oxydiphthalic anhydride (4-4 ' bisdiphthalic anhydride (ODPA), biphenyl-tetracarboxylic acid dianhydride (BPDA), and bis (3,4'-dicarboxyphenyl) dimethylsilanedianhydride. dimethylsilane dianhydride, SIDA).

(Preparation of polyamic acid)

The weight average molecular weight (Mw) of the polyamic acid prepared by the above method is preferably 10,000 to 500,000. If the molecular weight of the polyamic acid is less than 10,000, sufficient physical properties for forming the nanofiber nonwoven fabric can not be obtained. If the molecular weight exceeds 500,000, the handling of the solution is not easy and the processability is degraded.

The second step is the dehydration and ring-closing reaction step of producing the polyimide from polyamic acid as the following four methods.

In the re-impregnation method, a polyamic acid solution is added to an excess amount of a poor solvent to obtain a solid polyamic acid. As the re-precipitation solvent, water is mainly used, but toluene or ether is used as a co-solvent.

The chemical imidization method is a method in which a imidization reaction is chemically performed using a dehydration catalyst such as acetic anhydride / pyridine, and is useful for producing a polyimide film.

The thermal imidization method is a method in which the polyamic acid solution is heated to 150 to 350 ° C to thermally imidize it. In the simplest process and the crystallization degree is high, the amine exchange reaction occurs when the amine type solvent is used. have.

Finally, the isocyanate method uses a diisocyanate instead of a diamine as a monomer. When the monomer mixture is heated to a temperature of 120 ° C or higher, a polyimide is produced while CO 2 gas is generated.

(Production of polyimide)

The following describes nylon.

Generally, a polyamide refers to a generic term of a polymer linked by an amide bond (-CONH-), which can be obtained by condensation polymerization of a diamine and a dicarboxylic acid. Polyamides are characterized by amide bonds in the molecular structure, and their physical properties vary depending on the ratio of amide groups. For example, when the ratio of amide groups in the molecule is increased, specific gravity, melting point, absorbency, rigidity and the like are increased.

In addition, polyamide is a material used in a wide range of fields such as clothing, tire cord, carpet, rope, computer ribbon, parachute, plastic and adhesive due to its excellent resistance to corrosion, abrasion resistance, chemical resistance and insulation.

Generally, polyamides are classified into aromatic polyamides and aliphatic polyamides. Representative aliphatic polyamides include nylon. Nylon is originally a trademark of DuPont, Inc., but is now used as a generic name.

Nylon is a hygroscopic polymer and is sensitive to temperature. Representative nylons include nylon 6, nylon 66, and nylon 46.

First, nylon 6 is characterized by excellent heat resistance, moldability and chemical resistance, and is produced by ring-opening polymerization of ε-caprolactam in order to produce it. Nylon 6 means that caprolactam has 6 carbon atoms.

(Nylon 6 polymerization of caprolactam)

On the other hand, nylon 66 is generally similar in properties to nylon 6, but is superior in heat resistance to nylon 6 and superior in self-extinguishing and abrasion resistance. Nylon 66 is prepared by dehydration condensation polymerization of hexamethylenediamine and adipic acid.

(Nylon 66 polymerization by dehydration condensation polymerization reaction of hexamethylenediamine and adipic acid)

Nylon 46 is also excellent in heat resistance, mechanical properties and impact resistance, and has a high processing temperature. Nylon 46 is prepared by polycondensation of tetramethylenediamine and adipic acid. Diaminobutane (DAB), a raw material, is prepared from the reaction of acrylonitrile with hydrogen cyanide. In the first stage of the polymerization operation, a salt is formed from diaminobutane and adipic acid, and the mixture is polymerized under appropriate pressure The prepolymer is converted into a prepolymer and the solid of the prepolymer is polymerized at a solid state by treatment at about 250 ° C in the presence of nitrogen and water vapor.

In particular, nylon 46 exhibits excellent properties with a high amide concentration and a regular arrangement between the methylene and amide groups. The melting point of nylon 46 is about 295 ° C, which is higher than that of other types of nylon, and has attracted attention as a resin having excellent heat resistance due to the above characteristics.

On the other hand, polyurethane is not a thermosetting resin but a plastic having a similar three-dimensional structure. It has good quality and good resistance to chemicals. It is used for electric insulators, structural materials, bubble insulation, bubble cushion, elastic fiber, etc. It is also used as a substitute material of rubber because of its good elasticity. The isocyanate group (-N = C = O) readily bonds with the hydroxyl group (-OH) (urethane bond). When a molecule having two hydroxyl groups is reacted with diisocyanate using this reaction, a linear polymer is obtained. This polymer is polyurethane. Generally, toluene diisocyanate is used as the diisocyanate, and polyether or polyester is used as the molecule having the hydroxyl group (polyol). Using a polyether makes it smoother, and using polyester makes it harder. The polyurethane made by using a molecule having three or more hydroxyl groups as a polyol is three-dimensionally bonded. The polyurethane having such a structure has a characteristic that it does not deform against heat.

(Synthesis of polyurethane)

 The meta-aramid is the first high heat resistant aramid fiber that can be used at 350 ° C for a short time and 210 ° C for continuous use. When exposed to temperatures above this temperature, it is carbonized without melting or burning like other fibers . Above all, unlike other products that are flame retarded or refractory treated, they do not emit toxic gases or harmful substances even when carbonized, and thus they have excellent properties as eco-friendly fibers.

In addition, the meta-aramid has a very strong molecular structure of the fiber itself, so it has strong inherent strength as well as easy orientation of molecules in the fiber axis direction in the spinning stage to increase the strength of the fiber .

The specific gravity of the meta-aramid is 1.3 to 1.4, and the weight average molecular weight is preferably 300,000 to 1,000,000. The most preferred weight average molecular weight is 3,000 to 500,000. And a meta-oriented synthetic aromatic polyamide. The polymer should have a fiber-forming molecular weight, and may comprise a polyamide homopolymer, a copolymer and mixtures thereof, which are predominantly aromatic, wherein at least 85% of the amide (-CONH-) bonds are attached directly to the two aromatic rings . The ring may be unsubstituted or substituted. The polymer becomes a meta-aramid when the two rings or radicals are meta-oriented along the molecular chain with respect to each other. Preferably, the copolymer contains up to 10% other diamines substituted for the primary diamine used to form the polymer, or up to 10% other diacids substituted for the primary diacid chloride used to form the polymer It has a diacid chloride. Preferred meta-aramids are poly (meta-phenylene isophthalamide) (MPD-I) and copolymers thereof. One such meta-aramid fiber is < RTI ID = 0.0 > a < / RTI > children. Aramid fibers available from EI du Pont de Nemours and Company, but the meta-aramid fibers are available from Teijin Ltd., Tokyo, Japan. ≪ RTI ID = 0.0 > Possible trade names Tejinconex (R); New Star (TM) meta-aramid available from Yantai Spandex Co. Ltd, Shandong, China; And Chinfunex (registered trademark) Aramid 1313, available from Guangdong Charming Chemical Co., Ltd., Shinduo, Guangdong, China.

The inorganic polymer may be a single polymer containing a silane group or a siloxane group, or may be a silane group or a siloxane group and monomethacrylate, vinyl, hydride, distearate, bis (12 -Hydroxy-stearate), methoxy, ethoxylate, propoxylate, diglycidyl ether, monoglycidyl ether, monohydroxy, bis (hydroxyalkyl) ) And bis ((aminoethyl-aminopropyl) dimethoxysilyl) ether can be used.

On the other hand, the inorganic polymer of the spinning solution used in the present invention will be described.

The inorganic polymer refers to a polymer containing an inorganic element in a polymer main chain or a side chain. Herein, the inorganic element is narrowly defined as an internal transition such as a metal such as aluminum and magnesium which fill s and p orbitals, a transition metal such as titanium, zirconium and tungsten filling the d orbit, and a lanthanide-actinide group which fets the f orbit Metal), but broadly includes elements constituting the skeleton of elements such as Si, Ge, P, and B which are non-metallic inorganic elements.

The inorganic polymers are divided into the following four types.

First, when the inorganic component is contained in the side chain of the organic polymer, the organic polymer is maintained substantially in the nature and the inorganic component contained in the side chain is also represented. Second, the inorganic element is bonded to the skeleton of the polymer main chain with carbon Thirdly, in the case of an organic-inorganic hybrid polymer designed to serve as a precursor for the production of ceramics, fourthly, in the case of an ionic compound having a net-like structure or a lattice structure composed purely of inorganic components.

Interest in inorganic polymers began to emerge from the commercialization of silicon carbide (SiC) fibers (trade name: NICALON) synthesized by Polycarbosilane (PCS) by Yajima of Nippon Carbon in the mid 1980's It became an occasion. Until now, it is not so much utilized, but it is expected to be applied in the field of heat resistance in general industries as well as aerospace and nuclear fields in the future. Polymer impregnation and pyrolysis (PIP) is a method of applying an inorganic polymer to a composite. This is a method in which an organic compound such as PCS is mixed with a silicon carbide powder to prepare a slurry, Is impregnated into a fiber preform and pyrolyzed to obtain a silicon carbide base. Recently, attention has been paid to the development of a fiber having excellent heat resistance. Thus, by developing a new organic compound having excellent characteristics and improving the PIP method, a pyrolysis temperature can be increased to produce a silicon carbide base matrix having excellent crystallinity and stoichiometric ratio.

In addition, polyetherimides are also preferably used, and polyetherimides are transparent amber amorphous thermoplastic resins having the following chemical structure. It is a resin with an imide bond showing excellent heat resistance and mechanical properties and an ether bond with good processability. It has excellent heat resistance, mechanical properties, flame retardancy, and electrical properties, and is used in electrical and electronic parts, automobile parts, and machine parts.

(Polyetherimide)

It is characterized by excellent heat resistance. The load-distortion temperature is 200 ° C or more, and the long-term service temperature of UL is 170 ° C or more. It also shows excellent hydrolysis resistance (tensile strength retention after immersion in hot water for 10,000 hours is high). The dielectric constant and dielectric tangent are wide and stable in temperature range and frequency band. In addition, not only the dielectric breakdown voltage is high but also excellent flame retardancy is exhibited. An oxygen index of 47 or higher, UL94-V0 (thickness: 0.41 mm) / 5 VA (thickness 1.9 mm). The combustion amount (NBS test) at the time of combustion is extremely low, which is among the lowest among engineering plastics, and is excellent in resistance to ultraviolet rays and radiation.

On the other hand, the spinning solution is prepared by dissolving the polymer in a solvent, and the type of the solvent is not limited as long as it can dissolve the polymer. Examples thereof include phenol, formic acid, sulfuric acid, m-cresol, thiuoroacetone and hydride Methyl ethyl ketone, methyl ethyl ketone, aliphatic hydroxyl group, m-butyl alcohol, isobutyl alcohol, isobutyl alcohol, isobutyl alcohol, isobutyl alcohol, isobutyl alcohol, Propylene glycol, diethylene glycol, ethylene glycol, halogen compounds such as trichlorethylene, dichloromethane, aromatic compounds such as toluene, toluene, and the like, , Xylene, aliphatic cyclic compound groups such as cyclohexanone, cyclohexane and ester groups such as n-butyl acetate, ethyl acetate, aliphatic As the ether group, butyl cellosolve, acetic acid 2-ethoxy ethanol, 2-ethoxy ethanol, dimethyl amide dimethyl formamide, dimethylacetamide and the like can be used, and a plurality of kinds of solvents can be mixed and used. The polymer spinning solution preferably contains, but is not limited to, an additive such as a conductivity improver.

In the present invention, the polymer spinning solution filled in the spinning solution main tank 11 of the top-down or bottom-up electrospinning device 10 and the spinning solution main tank 31 of the bottom-up or down spinning electrospinning device 30 The polymeric spinning solution can be of the same or different kinds.

Basis Weight or Grammage, on the other hand, is defined as the mass per unit area, that is, the preferred unit, grams per square meter (g / m 2). The basis weight of the nanofiber web prepared on the mesh used as the support according to the present invention is preferably 0.001 to 0.2 g / m < 2 >. If the basis weight is less than 0.001 g / m < 2 >, mechanical properties are deteriorated. If 2.0 g / m < 2 >

Thereafter, a laminate of a base material and a nano-fiber web manufactured through the top-down or bottom-up electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30 constituting the apparatus for manufacturing nanofibers according to an embodiment of the present invention is laminated The laminating apparatus 50 is further provided at the rear end of the apparatus 1 for manufacturing nanofibers according to the present invention and performs a post-process.

The top-down or bottom-up electrospinning apparatus 10 and the bottom-up or bottom-down electrospinning apparatus 30 constituting the nanofiber manufacturing apparatus 1 may be arranged in parallel to one another in the horizontal direction, And the respective electrospinning devices are arranged in the U direction in the same layer. The fact that they can be arranged in the vertical direction for each layer or in the U direction in the same layer has the advantage that the productivity can be increased in a limited area.

That is, the rotary device is characterized in that the support rotates 180 degrees or vertically rotates in the U-turn direction by the flip device.

The laminate of each carrier and the nanofiber web is preferably bonded by a chemical or thermal adhesive according to an embodiment of the present invention, but it is also preferable that the laminate is bonded by ultrasonic bonding.

As the adhesive, a commercially available adhesive can be used. However, a low melting point polymer solution can be used. As the low melting point polymer solution, a low melting point polyvinylidene fluoride, a low melting point polyurethane or a low melting point nylon Is preferably used. The low-melting-point polymer solution preferably has a weight average molecular weight of 5000 to 15000 and a melting point of 80 to 160 ° C. When the molecular weight is less than 5,000, there is a problem that the adhesive strength is lowered. When the molecular weight is more than 15,000, it is not easily melted by heat and thus it is difficult to serve as an adhesive. When the melting point is lower than 80 ° C, it is difficult to use because of poor handling property. When the melting point is higher than 160 ° C, it is not easily melted at the laminating temperature and it is difficult to serve as an adhesive.

The carrier according to the present invention is one selected from the group consisting of a polyester carrier, a polyurethane carrier and a nylon carrier. The carrier may be a monofilament or a multifilament. It is also possible to use a low melting point nonwoven fabric. Preferably, the basis weight is 10 to 50 g / m 2. When the basis weight is less than 10 g / m 2, the physical properties of the window filter base material are poor. When the basis weight exceeds 50 g / m 2, the stiffness is high and the workability is poor.

Meanwhile, the method includes a step of placing the carrier on the nanofiber manufacturing apparatus and applying an adhesive between the carrier and the nanofiber web in the course of laminating the nanofiber web by electrospinning the polymer spinning solution directly on the carrier . When an adhesive is applied, desorption is not caused between the nanofiber web and the carrier, so it is preferable to use the adhesive. The application of the adhesive is preferably partially applied on the substrate, and it is also possible to use a chemical or thermal adhesive partially electrospun on the carrier.

The fine dust barrier filter composed of the nanofiber web and the carrier manufactured by the above electrospinning has a DOP filtration efficiency of 80% or more for particles having a light transmittance of 30 to 80%, an air permeability of 10 to 500, and a particle size of 2.5 μm And the filtration efficiency is excellent. Therefore, when the filter for blocking fine dust of the present invention is installed in a window of a home or an office, it is possible to effectively prevent the contaminated air from entering the room while ensuring visibility It is effective. When the light transmittance is 30% and the air permeability is less than 10, visibility and air permeability are not good, which is not suitable for use in ventilated windows.

Further, the filter for blocking fine dust according to the present invention has a flame retardancy index of not less than 25 by the treatment of a flame-retardant coating agent which maximizes the flame-retarding effect of the product by improving the flame- Feature.

A method for manufacturing a filter for blocking fine dust by treating a flame-retardant coating agent is as follows. First, 5-50 wt% of an inorganic flame retardant, 5-20 wt% of a cationic urethane, 1-70 wt% of water and 1-10 wt% of other additives are mixed with each other and then mixed for 5-10 minutes so that the mixture becomes homogeneous, To prepare a coating agent. The flame retardant coating agent is applied to one kind of carrier selected from the group consisting of a polyester carrier, a polyurethane carrier and a nylon carrier, and then the polymeric spinning solution And the nanofiber web is laminated. Thereafter, adhesion of the carrier coated with the flame-retardant coating agent and the nanofiber web layer results in a fine dust-blocking filter having improved flame retardancy.

Hereinafter, a method of manufacturing a filter for blocking fine dust according to an embodiment of the present invention will be described.

In general, it is preferable to use a bottom-up electrospinning device for manufacturing a nanofiber. However, in one embodiment of the present invention, productivity can be improved by simultaneously using the bottom-up electrospinning device and the top-down electrospinning device, and a rotating device is provided between the respective electrospinning devices, As shown in Fig.

Meanwhile, the present invention forms a nanofiber web by electrospinning a polymer spinning solution through a top-down electrospinning device on a carrier to produce a filter for blocking fine dust. The carrier may be one selected from the group consisting of a polyester carrier, a polyurethane carrier, a low melting point nonwoven fabric, and a nylon carrier, wherein the monofilament or the multifilament Is preferably used.

First, the carrier is supplied to the top-down or bottom-up electrospinning device 10 through the feed roller 5 provided at the tip of the nanofiber manufacturing apparatus 1 of the present invention.

On the other hand, a carrier supplied through the feed roller 5 to the top-down or bottom-up electrospinning apparatus 10 is located on the top surface of the collector 17. At this time, a high voltage of the voltage generator (not shown) is generated on the nozzle 15 and the collector 17, and the polymer spinning solution filled in the spinning liquid main tank 11 on the collector 17 flows into the nozzle block 13 via a nozzle 15.

Here, the polymer spinning solution filled in the spinning liquid main tank 11 is continuously and constantly supplied in a large number of nozzles 15 to which a high voltage is applied through a metering pump (not shown) The supplied spinning solution is radiated and focused on the collector 17 with a high voltage through the nozzle 15, and the first nanofiber web is laminated on the upper surface of the carrier. Generally, the average diameter of the first nanofiber web is preferably 200 to 600 nm.

As described above, the carrier, on which the nanofiber web is laminated on the upper surface thereof via the top-down or bottom-up electrospinning device 10, is then moved to the rotating device 20.

As the upper surface is rotated 180 degrees to the lower surface while the carrier having the first nanofiber web laminated on the upper surface passes through the rotating device 20, the first nanofiber web positioned on the upper surface of the carrier is reversed do.

As described above, the carrier whose upper surface is rotated to the lower surface through the rotary device 20 is then fed to the bottom-up or top-down electrospinning device 30 by the conveying roller 7, and the bottom- The carrier supplied to the collector 30 is located on the lower surface of the collector 37.

The high voltage of the voltage generator is generated in the nozzle 35 and the collector 37 and the polymer spinning solution filled in the spinning liquid main tank 31 on the collector 37 generating the high voltage is supplied to the nozzle block 33 Through the nozzle 35 of the spray nozzle.

Each of the voltage generators has a structure similar to that of a general electrospinning device and generates a high voltage in the collectors 17 and 37 through the nozzles 15 and 35 and a nozzle 15 and 35 and the collector located below or above the nozzle blocks 13 and 33, preferably a voltage of 1 kV or more, more preferably 20 kV or more.

On the other hand, the spinning liquid to be filled in the spinning liquid main tank 31 is continuously and constantly supplied in a plurality of nozzles 35 to which a high voltage is applied through the metering pump, and the spinning solution supplied from the nozzle 35 is supplied to the nozzle On a first nanofiber web which is laminated by top-down or bottom-up electrospinning on the top surface of the carrier while being radiated and focused on a collector 37 with a high voltage applied by a first nano- A fibrous web is laminated.

At this time, the carrier is conveyed to the top-down or bottom-up electrospinning apparatus 10, to the rotating apparatus 20, and to the bottom-up or top-down electrospinning apparatus 30 by the conveying roller 7.

In the present invention, it is preferable that the top-down or bottom-down electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30 are arranged in a straight line in the horizontal direction, but they may be arranged in a vertical direction, And the respective electrospinning devices are arranged in the U direction in the same layer. The fact that they can be arranged in the vertical direction for each layer or in the U direction in the same layer has the advantage that the productivity can be increased in a limited area.

That is, the rotary device is typically characterized in that the support rotates 180 degrees or vertically in the U-turn direction by a flip device.

In addition, the spinning liquid main tank 11 and the spinning liquid main tank 31 may be the same.

As described above, the process of continuously laminating the nanofiber webs on one side of the carrier while transferring the support to the top-down or bottom-up electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30 is repeated.

At this time, the spinning liquid main tanks 11 and 31 of the top-down or bottom-up electrospinning apparatus 10 and the bottom-up or top-down electrospinning apparatus 30 are filled with the same type of polymer spinning solution.

In order to attach the carrier of the present invention and the nanofiber web, it is preferable to use a chemical or thermal adhesive or use ultrasonic bonding.

Hereinafter, embodiments of the present invention will be described in more detail. However, the embodiments are only examples of the present invention, and the scope of the present invention is not limited thereto.

[Example 1]

A polyurethane spinning solution having a weight average molecular weight of 157,000 was dissolved in 15% by weight of polyurethane (Korean traditional fiber) and 85% by weight of dimethylformamide (DMF) to prepare a polyurethane spinning solution having a concentration of 15%. Thereafter, the polyurethane spraying solution was moved to the nozzle block, and the distance between the nozzle block and the collector was then electrospun on a polyester carrier under the conditions of 20 cm, an applied voltage of 15 kV, and a flushing liquid flow rate of 0.1 mL / h. / m < 2 > At this time, carrier 20 denier polyester monofilament is used as a warp, 60 denier polyester monofilament as weft, weft density of weft density is 96E / inch, weft density of weft is 80P / inch, weft density is 12.93g / yd, and the weigth of weft was 31.8 g / yd. After electrospinning, polyimide nanofiber filters were prepared by imidizing polyamic acid by heat treatment at 150 ° C in a laminating machine. Thereafter, the polyester carrier and the polyurethane nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the polyurethane nanofiber web was 400 nm.

[Example 2]

As a carrier, 30 denier polyester monofilaments are used as warp yarns and 60 denier polyester monofilaments are used as weft yarns. Weft density of weft density is 96E / inch, weft density of weft yarn is 80P / inch, weft density is 24.93g / yd, and the basis weight of weft was 32.8 g / yd.

[Example 3]

A filter was prepared in the same manner as in Example 1 except that the basis weight of the polyurethane nanofiber web was 0.2 g / m ² .

[Example 4]

A filter was prepared in the same manner as in Example 1 except that the basis weight of the polyurethane nanofiber web was 0.3 g / m ² .

[Example 5]

A filter was prepared in the same manner as in Example 1, except that the basis weight of the polyurethane nanofiber web was 0.4 g / m ² .

[Example 6]

A filter was prepared in the same manner as in Example 1 except that the basis weight of the polyurethane nanofiber web was 0.5 g / m ² .

[Example 7]

A polyurethane spinning solution having a weight average molecular weight of 157,000 was dissolved in 15% by weight of polyurethane (Korean traditional fiber) and 85% by weight of dimethylformamide (DMF) to prepare a polyurethane spinning solution having a concentration of 15%. Thereafter, the polyurethane spraying solution was moved to each nozzle block of the top-down electrospinning device and the bottom-up electrospinning device, and the distance between the nozzle block and the collector was set to 20 cm, the applied voltage was 10 kV, the spinning solution flow rate was set to 0.1 mL / h, The first polyurethane nanofiber web was laminated by electrospinning on the same polyester carrier as the first polyurethane nanofiber web. That is, on the top-down electrospinning device located at the front end, the polyurethane spinning solution is electrospun on the polyester carrier to form a first polyurethane nanofiber web. Thereafter, in the bottom-up electrospinning device located at the rear end after rotating the laminate composed of the polyester carrier and the first polyurethane nanofiber web 180 degrees (after up-down reversing) by the rotating device, The nanofiber web was laminated by electrospinning on a urethane nanofiber web to form a second polyurethane nanofiber web. The polyester carrier and the polyurethane nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the polyurethane nanofiber web was 400 nm.

[Example 8]

15% by weight of polyvinylidene fluoride having a weight average molecular weight of 50,000 and 85% by weight of dimethylacetamide (N, N-Dimethylacetamide, DMAc) were dissolved to prepare a polyvinylidene fluoride spinning solution having a concentration of 15% And was provided in the raw material tank. Thereafter, the polyvinylidene fluoride spinning solution was moved to a nozzle block, and then electrospinning was carried out on a polyester carrier under the conditions of a distance between the nozzle block and the collector of 20 cm, an applied voltage of 15 kV, and a spinning solution flow rate of 0.1 mL / And a polyamic acid nanofiber web of 0.1 g / m < 2 > At this time, carrier 20 denier polyester monofilament is used as a warp, 60 denier polyester monofilament as weft, weft density of weft density is 96E / inch, weft density of weft is 80P / inch, weft density is 12.93g / yd, and the weigth of weft was 31.8 g / yd. Then, the polyester carrier and the polyvinylidene fluoride nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dusts. The average diameter of the polyvinylidene fluoride nanofiber web was 160 nm.

[Example 9]

As a carrier, 30 denier polyester monofilaments are used as warp yarns and 60 denier polyester monofilaments are used as weft yarns. Weft density of weft density is 96E / inch, weft density of weft yarn is 80P / inch, weft density is 24.93g / yd, and the basis weight of wool was 32.8 g / yd.

[Example 10]

A filter was prepared in the same manner as in Example 8, except that the basis weight of the polyvinylidene fluoride nanofiber web was 0.2 g / m ² .

[Example 11]

A filter was prepared in the same manner as in Example 8 except that the basis weight of the polyvinylidene fluoride nanofiber web was 0.3 g / m ² .

[Example 12]

A filter was prepared in the same manner as in Example 8 except that the basis weight of the polyvinylidene fluoride nanofiber web was 0.4 g / m ² .

[Example 13]

A filter was prepared in the same manner as in Example 8 except that a carrier used as the insect control net was treated with a phosphorus flame retardant to give a flame retardant polyester carrier.

[Example 14]

The polyvinylidene fluoride spinning solution having a weight average molecular weight of 50,000 and a concentration of 15% was prepared by dissolving 15% by weight of polyvinylidene fluoride and 85% by weight of dimethylacetamide (N, N-dimethylacetamide, DMAc) Lt; / RTI > Thereafter, the polyvinylidene fluoride spinning solution was moved to each nozzle block of the top-down electrospinning device and the bottom-up electrospinning device, and the distance between the nozzle block and the collector was 20 cm, the applied voltage was 10 kV, the spinning solution flow rate was 0.1 mL / h The first polyvinylidene fluoride nanofiber web was laminated by electrospinning on the same polyester carrier as in Example 1. That is, on the top-down electrospinning device located at the front end, the polyvinylidene fluoride spinning solution was electrospun on the polyester carrier to form a first polyvinylidene fluoride nanofiber web. Thereafter, the laminate composed of the polyester carrier and the first polyvinylidene fluoride nanofiber web was rotated by a rotating device by 180 degrees (after up-down reversing), and then, in the bottom-up electrospinning device located at the rear end, polyvinylidene fluoride The spinning solution was electrospun on the first polyvinylidene fluoride nanofiber web to form a second polyvinylidene fluoride nanofiber web, and the nanofiber web was laminated. The polyester carrier and the polyvinylidene fluoride nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the polyvinylidene fluoride nanofiber web was 160 nm.

[Example 15]

The polyacrylonitrile spinning solution having a weight average molecular weight of 157,000 was dissolved in 15% by weight of polyacrylonitrile (Korea-Japan Synthetic Fiber) and 85% by weight of dimethylformamide (DMF) to prepare a polyacrylonitrile spinning solution having a concentration of 15% . Thereafter, the polyacrylonitrile spinning solution was moved to the nozzle block, and the distance between the nozzle block and the collector was set to 20 cm, the applied voltage was 15 kV, the spinning solution flow rate was 0.1 mL / h, the temperature was 22 ° C and the humidity was 20% Ester carrier to form a polyamic acid nanofiber web having a basis weight of 0.1 g / m < 2 >. At this time, carrier 20 denier polyester monofilament is used as a warp, 60 denier polyester monofilament as weft, weft density of weft density is 96E / inch, weft density of weft is 80P / inch, weft density is 12.93g / yd, and the weigth of weft was 31.8 g / yd. Then, the polyester carrier and the polyacrylonitrile nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dusts. At this time, the average diameter of the polyacrylonitrile nanofiber web was 200 nm.

[Example 16]

As a carrier, 30 denier polyester monofilaments are used as warp yarns and 60 denier polyester monofilaments are used as weft yarns. Weft density of weft density is 96E / inch, weft density of weft yarn is 80P / inch, weft density is 24.93g / yd, and the basis weight of wool was 32.8 g / yd.

[Example 17]

A filter was prepared in the same manner as in Example 15, except that the basis weight of the polyacrylonitrile nanofiber web was 0.2 g / m 2.

[Example 18]

A filter was prepared in the same manner as in Example 15, except that the basis weight of the polyacrylonitrile nanofiber web was 0.3 g / m 2.

[Example 19]

A filter was prepared in the same manner as in Example 15 except that the basis weight of the polyacrylonitrile nanofiber web was 0.4 g / m 2.

[Example 20]

A filter was prepared in the same manner as in Example 15, except that the basis weight of the polyacrylonitrile nanofiber web was 0.5 g / m 2.

[Example 21]

The polyacrylonitrile spinning solution having a weight average molecular weight of 157,000 was dissolved in 15% by weight of polyacrylonitrile (Korea-Japan Synthetic Fiber) and 85% by weight of dimethylformamide (DMF) to prepare a polyacrylonitrile spinning solution having a concentration of 15% . Thereafter, the polyacrylonitrile spinning solution was moved to each nozzle block of the top-down electrospinning device and the bottom-up electrospinning device, and then the distance between the nozzle block and the collector was set to 20 cm, the applied voltage was 10 kV, the spinning solution flow rate was set to 0.1 mL / h The first polyacrylonitrile nanofiber web was laminated by electrospinning on the same polyester carrier as in Example 1. That is, on the top-down electrospinning device located at the front end, the polyacrylonitrile spinning solution is electrospun on the polyester carrier to form a first polyacrylonitrile nanofiber web. After that, the laminate composed of the polyester carrier and the first polyacrylonitrile nanofiber web was rotated by 180 deg. By a rotating device (after up-down reversing), and then the polyacrylonitrile spinning solution The nanofiber web was laminated by electrospinning on the first polyacrylonitrile nanofiber web to form a second polyacrylonitrile nanofiber web. The polyester carrier and the polyacrylonitrile nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the polyacrylonitrile nanofiber web was 250 nm.

[Example 22]

15% by weight of nylon having a weight average molecular weight of 50,000 and 85% by weight of formic acid were dissolved to prepare a nylon spinning solution having a concentration of 15% and provided in the raw material tank. After that, the nylon spinning solution was moved to the nozzle block, and the distance between the nozzle block and the collector was 20 cm, the applied voltage was 15 kV, the spinning liquid flow rate was 0.1 mL / h, the temperature was 22 ° C, To form a polyamic acid nanofiber web having a basis weight of 0.1 g / m < 2 >. At this time, carrier 20 denier polyester monofilament is used as a warp, 60 denier polyester monofilament as weft, weft density of weft density is 96E / inch, weft density of weft is 80P / inch, weft density is 12.93g / yd, and the weigth of weft was 31.8 g / yd. Thereafter, the polyester carrier and the nylon nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the nylon nanofibrous web was 120 nm.

[Example 23]

As a carrier, 30 denier polyester monofilaments are used as warp yarns and 60 denier polyester monofilaments are used as weft yarns. Weft density of weft density is 96E / inch, weft density of weft yarn is 80P / inch, weft density is 24.93g / yd, and the basis weight of wool was 32.8 g / yd.

[Example 24]

A filter was prepared in the same manner as in Example 22 except that the basis weight of the nylon nanofibrous web was 0.2 g / m 2.

[Example 25]

A filter was prepared in the same manner as in Example 22 except that the basis weight of the nylon nanofibrous web was 0.3 g / m 2.

[Example 26]

A filter was prepared in the same manner as in Example 22 except that the basis weight of the nylon nanofibrous web was 0.4 g / m 2.

[Example 27]

A filter was prepared in the same manner as in Example 22 except that the basis weight of the nylon nanofibrous web was 0.5 g / m 2.

[Example 28]

15% by weight of nylon having a weight average molecular weight of 50,000 and 85% by weight of formic acid were dissolved to prepare a nylon spinning solution having a concentration of 15% and provided in a raw material tank. After that, the nylon spinning solution was moved to each nozzle block of the top-down electrospinning device and the bottom-up electrospinning device. The distance between the nozzle block and the collector was 20 cm, the applied voltage was 10 kV, the spinning solution flow rate was 0.1 mL / h, The first nylon nanofibrous web was laminated by electrospinning on the same polyester carrier as in Example 1 under the condition of 20% humidity. That is, on the top-down electrospinning device located at the front end, the nylon spinning solution is electrospun on the polyester carrier to form a first nylon nanofiber web. After that, the laminate composed of the polyester carrier and the first nylon nanofibrous web is rotated 180 degrees (after upside down) by a rotating device, and then, in the bottom-up electrospinning device located at the rear end, the nylon spinning solution is mixed with the first nylon nanofibers The nanofiber web was laminated by electrospinning on the web to form a second nylon nanofiber web. The polyester carrier and the nylon nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the nylon nanofiber web was 100 nm.

[Example 29]

Viscosity: 1,200 cps, solids weight: 15% Polyether sulfone was dissolved in dimethylacetamide (DMAc) to prepare a polyethersulfone spinning solution, which was provided in the raw material tank. Thereafter, the polyethersulfone spinning solution was transferred to the nozzle block, and the distance between the nozzle block and the collector was 20 cm, the applied voltage was 15 kV, the spinning liquid flow rate was 0.1 mL / h, the temperature was 22 ° C and the humidity was 20% And a polyethersulfone nanofiber web having a basis weight of 0.1 g / m ² was laminated on the carrier. At this time, carrier 20 denier polyester monofilament is used as a warp, 60 denier polyester monofilament as weft, weft density of weft density is 96E / inch, weft density of weft is 80P / inch, weft density is 12.93g / yd, and the weigth of weft was 31.8 g / yd. Then, the polyester carrier and the polyethersulfone nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dusts. The average diameter of the polyether sulfone nanofiber web was 150 nm.

[Example 30]

As a carrier, 30 denier polyester monofilaments are used as warp yarns and 60 denier polyester monofilaments are used as weft yarns. Weft density of weft density is 96E / inch, weft density of weft yarn is 80P / inch, weft density is 24.93g / yd, and the basis weight of wool was 32.8 g / yd.

[Example 31]

A filter was prepared in the same manner as in Example 29 except that the basis weight of the polyether sulfone nanofiber web was 0.2 g / m ² .

[Example 32]

A filter was prepared in the same manner as in Example 29 except that the basis weight of the polyether sulfone nanofiber web was 0.3 g / m ² .

[Example 33]

A filter was prepared in the same manner as in Example 29, except that the basis weight of the polyether sulfone nanofiber web was 0.4 g / m ² .

[Example 34]

A filter was prepared in the same manner as in Example 29, except that the basis weight of the polyether sulfone nanofiber web was 0.5 g / m ² .

[Example 35]

Viscosity: 1,200 cps, solids weight: 15% Polyether sulfone was dissolved in dimethylacetamide (DMAc) to prepare a polyethersulfone spinning solution, which was provided in the raw material tank. Thereafter, the polyethersulfone spinning solution was moved to each of the nozzle blocks of the top-down electrospinning device and the bottom-up electrospinning device, and the distance between the nozzle block and the collector was 20 cm, the applied voltage was 10 kV, the spinning solution flow rate was 0.1 mL / 1 on the same polyester carrier to laminate the first polyethersulfone nanofiber web. That is, on the top-down electrospinning device located at the front end, the polyethersulfone spinning solution is electrospun on the polyester carrier to form a first polyethersulfone nanofiber web. Thereafter, the laminate composed of the polyester carrier and the first polyethersulfone nanofiber web was rotated 180 degrees by a rotating device (after up-down reversing), and then the polyethersulfone spinning solution 1 < / RTI > polyethersulfone nanofibrous web to laminate the second polyethersulfone nanofibrous web to laminate the nanofibrous web. The polyester carrier and the polyethersulfone nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the polyether sulfone nanofiber web was 150 nm.

[Example 36]

15% by weight and a viscosity of 102,000 cps were prepared by dissolving 15% by weight of polyamic acid (Sangafron Tech) and 85% by weight of dimethylacetamide (DMAc) to prepare a polyamic acid solution Was introduced into the main tank. Thereafter, the polyamic acid solution was transferred to the nozzle block. Thereafter, the distance between the nozzle block and the collector was 20 cm, the applied voltage was 15 kV, the spinning liquid flow rate was 0.1 ml / h, the temperature was 22 ° C and the humidity was 20% And a polyamic acid nanofiber web having a basis weight of 0.1 g / m < 2 > was laminated on the carrier. At this time, carrier 20 denier polyester monofilament is used as a warp, 60 denier polyester monofilament as weft, weft density of weft density is 96E / inch, weft density of weft is 80P / inch, weft density is 12.93g / yd, and the weigth of weft was 31.8 g / yd. After electrospinning, polyimide nanofiber filters were prepared by imidizing polyamic acid by heat treatment at 150 ° C in a laminating machine. Then, the polyester carrier and the polyimide nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the polyimide nanofibers was 400 nm.

[Example 37]

As a carrier, 30 denier polyester monofilaments are used as warp yarns and 60 denier polyester monofilaments are used as weft yarns. Weft density of weft density is 96E / inch, weft density of weft yarn is 80P / inch, weft density is 24.93g / yd, and the basis weight of wool was 32.8 g / yd.

[Example 38]

A filter was prepared in the same manner as in Example 36 except that the basis weight of the polyimide nanofiber web was 0.2 g / m 2.

[Example 39]

A filter was prepared in the same manner as in Example 36 except that the basis weight of the polyimide nanofiber web was 0.3 g / m 2.

[Example 40]

A filter was prepared in the same manner as in Example 36 except that the basis weight of the polyimide nanofiber web was 0.4 g / m 2.

[Example 41]

A filter was prepared in the same manner as in Example 36 except that the basis weight of the polyimide nanofiber web was 0.5 g / m 2.

[Example 42]

15% by weight and a viscosity of 102,000 cps were prepared by dissolving 15% by weight of polyamic acid (Sangafron Tech) and 85% by weight of dimethylacetamide (DMAc) to prepare a polyamic acid solution Was introduced into the main tank. Thereafter, the polyamic acid spinning solution was moved to each nozzle block of the top-down electrospinning device and the bottom-up electrospinning device. Then, the distance between the nozzle block and the collector was 20 cm, the applied voltage was 15 kV, the spinning solution flow rate was 0.1 ml / C and a humidity of 20%, the first polyamic acid nanofiber web having a basis weight of 0.1 g / m < 2 > was laminated on the same polyester carrier as in Example 1. Thereafter, the laminate was rotated 180 degrees by a rotating device, and then a polyamic acid spinning solution was electrospinned on the first polyamic acid nanofiber web in a bottom-up electrospinning device located at the rear end to form a second polyamic acid nanofiber web Respectively. After electrospinning, the polyimide nanofiber filter was prepared by imidizing polyamic acid by heat treatment at 150 ° C in a laminating machine. Then, the polyester carrier and the polyimide nanofiber web were attached by ultrasonic bonding to produce a filter for blocking fine dust. The average diameter of the polyimide nanofibers was 350 nm.

[Comparative Example 1]

A filter composed of a nanofiber web prepared by electrospinning the same polymer spinning solution as in Example 1 was prepared between two low melting point nonwoven fabrics (LM nonwoven fabric, POA40V6) composed of two sheets and having a basis weight of 60 g / m 2.

- DOP efficiency measurement

The DOP efficiency was measured for particles with a size of 2.5 mu m by the method according to ASTM D2986 under conditions of a wind speed of 1.0 m / s and a terminal pressure loss of 76 mmAq.

Air Permeability Measurement (CFM)

The air permeability was measured using a method according to JIS L 1096: 2010 under a pressure of 125 Pa for an area of 38 cm 3.

 Light transmittance measurement

The light transmittance was measured by a method according to ASTM E 424-71: 2007 using a UV-VIS-NIR SPECTROPHOTOMER under the conditions of a wavelength range of 390 nm to 1722 nm and a wavelength interval of 1 nm.

DOP Efficiency (%) Air permeability (CFM) Light transmittance (%) Example 1 82 450 78 Example 2 82 430 76 Example 3 85 425 70 Example 4 88 410 56 Example 5 90 390 65 Example 6 95 350 60 Example 7 83 435 77 Example 8 88 430 72 Example 9 88 412 70 Example 10 91 406 64 Example 11 94 395 50 Example 12 95 371 59 Example 13 95 334 54 Example 14 89 416 71 Example 15 83 433 73 Example 16 83 415 71 Example 17 86 409 65 Example 18 89 398 51 Example 19 91 374 60 Example 20 94 337 55 Example 21 84 419 72 Example 22 84 436 74 Example 23 84 418 72 Example 24 87 410 66 Example 25 90 400 52 Example 26 92 376 61 Example 27 95 340 56 Example 28 85 426 73 Example 29 85 440 75 Example 30 85 425 73 Example 31 85 416 67 Example 32 88 405 53 Example 33 91 379 62 Example 34 93 343 57 Example 35 94 429 74 Example 36 86 443 77 Example 37 86 428 75 Example 38 87 419 69 Example 39 88 408 48 Example 40 89 381 64 Example 41 92 345 59 Example 42 86 431 75 Comparative Example 1 40 8 0

Thus, the embodiment of the present invention has an advantage of not only superior DOP efficiency as a filter for blocking fine dust, but also excellent air permeability and visibility compared with Comparative Example 1.

Further, in Examples 7, 14, 21, 28, 35, and 42, by using the bottom-up and top-down electrospinning devices together, there is an advantage that the productivity of manufacturing the filter including the nanofiber web can be improved.

As described above, the configuration and method of the embodiments described above can be applied to a window filter for blocking fine dust according to the present invention and a method of manufacturing the same, All or some of the embodiments may be selectively combined.

1: a nanofiber manufacturing apparatus, 3: a support,
5: feed roller, 7: feed roller,
9: take-up roller, 10: top-down electrospinning device,
11: tank main tank, 13: nozzle block,
14: voltage generating device, 15: nozzle,
17: collector, 20: rotating device,
20-1: Flip device,
21, 21: left and right guide members,
22, 22: Left and right guide grooves,
30: bottom-up electrospinning device, 31: spinning liquid main tank,
33: nozzle block, 35: nozzle,
37: collector, 50: laminating device,
60: Temperature control device,
70: air permeability measuring device,
112: tubular body,
113: Heat line.

Claims (17)

carrier; And
A nanofiber web laminated on one side of the carrier and having a plurality of micropores formed by electrospinning the polymer spinning solution, and the basis weight of the nanofiber web is 0.001 to 2.0 g / m < 2 > Filter.
The method according to claim 1,
Wherein the polymer for nanofiber formation used in the polymer spinning solution is polyurethane.
The method according to claim 1,
Wherein the polymer for nanofiber formation used in the polymer spinning solution is polyvinylidene fluoride.
The method according to claim 1,
Wherein the polymer for nanofiber formation used in the polymer spinning solution is polyacrylonitrile.
The method according to claim 1,
Wherein the polymer for nanofiber formation used in the polymer spinning solution is a polyamide.
The method according to claim 1,
Wherein the nanofiber-forming polymer used in the polymer spinning solution is polyethersulfone.
The method according to claim 1,
Wherein the polymer for nanofiber formation used in the polymer spinning solution is a polyamic acid.
8. The method according to any one of claims 1 to 7,
Wherein the carrier is one kind selected from the group consisting of a polyester carrier, a polyurethane carrier and a nylon carrier, and the basis weight is 10 g / m ² to 50 g / m ² . Filter.
8. The method according to any one of claims 1 to 7,
Wherein the nanofiber web is attached to the carrier by at least one method selected from the group consisting of a method of ultrasonic bonding, a method of chemical adhesive, and a method of thermal bonding.
8. The method according to any one of claims 1 to 7,
Wherein the filter has a DOP filtration efficiency of 80% or more for particles having a size of 2.5 탆.
8. The method according to any one of claims 1 to 7,
Wherein the filter has an air permeability of 10 to 500 CFM and a light transmittance of 30 to 80%.
8. The method according to any one of claims 1 to 7,
Wherein the carrier is coated with a flame retardant coating agent, and the flame retardancy index is 25 or more.
Preparing a carrier;
Laminating a nanofiber web by electrospinning a polymer spinning solution on the carrier; And
And attaching the carrier and the nanofiber web layer to each other.
14. The method of claim 13,
Wherein the step of laminating the nanofiber web on the carrier comprises applying an adhesive on the carrier and then electrospinning the polymer spinning solution.
14. The method of claim 13,
Wherein the nanofiber web is attached to the carrier by at least one method selected from the group consisting of a method of ultrasonic bonding, a method of chemical adhesive, and a method of thermal bonding. Way.
14. The method of claim 13,
Characterized in that the polymer spinning solution is electrospun through a nozzle at a high temperature of 45 to 120 DEG C by electrospinning in a step of laminating the nanofiber web by electrospinning the polymer spinning solution on the carrier, A method of manufacturing a filter for blocking dust.
14. The method of claim 13,
The step of electrospinning the polymer spinning solution on the carrier to laminate the nanofiber web
Depositing a first nanofiber web on a surface of the carrier by electrospinning a polymer spinning solution with a top-down electrospinning device;
The laminate having the first nanofiber web laminated thereon is rotated 180 degrees with the upper surface passing through the rotating device to the lower surface; And
And sequentially laminating a second nanofiber web on the first nanofiber web by electrospinning the polymer spinning solution with a bottom-up electrospinning device.

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