KR20190010213A - Filter media, method for manufacturing thereof and Filter unit comprising the same - Google Patents

Abstract

Provided is a filter medium. According to an embodiment of the present invention, the filter medium includes: a first porous support body; and a nanofiber web having a three-dimensional network structure formed with nanofibers surrounded by a cladding layer including a functional substance. Thus, polymer compounds having different functions are able to be used as a fiber formation component or a functional additive to enable various functions to be configured in a single filter medium, and the nanofibers of the nanofiber web are uniform in thickness and pores are equal in size, and a warp-breakage rate of the nanofibers is able to be significantly reduced. Moreover, the present invention is capable of minimizing damage and the deformation of the shape and structure of the filter medium during water treatment, and having a high flowrate by securing a passage smoothly. Also, the present invention is capable of having an extended lifespan with excellent durability of the filter medium despite the high pressure applied during backwashing, while having excellent water-permeability with improved hydrophilic properties, thereby being applied in various water treatment fields.

Description

TECHNICAL FIELD The present invention relates to a filter medium, a method of manufacturing the filter medium, and a filter unit including the filter medium.

More particularly, the present invention relates to a filter material having mechanical strength capable of exhibiting advantageous different functions at the same time, excellent in durability and capable of withstanding high pressure due to backwashing, a method for manufacturing the same, and a method for manufacturing the same To the filter unit.

The separation membrane can be classified into a microfiltration membrane (MF), an ultrafiltration membrane (UF), a nanofiltration membrane (NF), or a reverse osmosis membrane (RO) depending on the pore size.

Although the separation membranes have different usages and pore size differences, they have a common feature in that they are in the form of a filtration medium or a porous polymer filtration medium formed from fibers or a composite membrane thereof.

The porous polymer filter medium may be formed by forming pores formed in a polymer membrane or a polymer hollow fiber by sintering the pore former through a separate pore former contained in the tank solution or by dissolving the pore former in an external coagulating solution It is common. On the contrary, the filter medium formed from the fibers is generally manufactured by accumulating the manufactured short fibers and then applying heat / pressure or the like, or applying heat / pressure or the like simultaneously with the spinning.

Typical examples of the filtration media formed from the fibers are nonwoven fabric. In general, the pores of the nonwoven fabric are controlled by the diameter of the short fibers, the basis weight of the medium, and the like. However, since the diameter of the short fibers included in the general nonwoven fabric is in the unit of microns, there is a limitation in realizing a separation membrane having a fine and uniform pore structure only by controlling the diameter and basis weight of the fibers. Accordingly, It is difficult to realize a separation membrane such as an ultrafiltration membrane or a nano separation membrane for filtration.

A method designed to solve this problem is a separation membrane produced through microfibers having a fiber diameter of nanometer. However, the microfine fiber having a diameter of nanometer unit is difficult to be manufactured by only one spinning process by a fiber spinning process such as a general wet spinning process, and it is necessary to elute the sea component separately after radiating to sea chart yarn, There is a problem that it is troublesome to work, the cost is increased, and the production time is extended. Recently, there has been a tendency to manufacture a large number of filter media formed from fibers by directly spinning fibers having a diameter of nanometer unit through electrospinning.

In the pore of the filtration media in which the water treatment process is repeatedly performed, some of various foreign substances contained in the for-treatment water may remain or an adherent layer may be formed on the surface of the filtration medium. there is a problem. In order to solve this problem, it is conceivable to prevent the occurrence of the fouling phenomenon itself by the pretreatment or to clean the filtration medium already having the fouling phenomenon. In the filtration medium, It is common to apply a high pressure to the filtration medium to remove the foreign matter remaining in the filtration medium so as to be in the opposite direction to the path through which the fluid flows and flows out. However, the high pressure applied to the filtration media during washing may cause damage to the filtration media, and in the case of the filtration media formed in a multi-layer structure, the problem of interlayer separation may occur.

On the other hand, when the fiber is used as a filter medium as described above, a multifunctional filter medium containing various polymer compounds can be realized as a fiber forming component or a functional additive. At this time, the polymer compound forms a polymer compound having a large size by polymerizing a monomer having a small size, and the polymer compound has unique characteristics different from those of a monomer. That is, by polymerizing a monomer as a simple organic material, a polymer compound having a desired function can be used as a fiber forming component or an additive.

The function of the polymer compound is not limited to the functional properties expressed by the properties of the polymer compound itself such as hydrophilic / hydrophobic characteristics, polar / nonpolar nature, heat resistance and chemical resistance, but also mechanical strength, ion exchange characteristics, immobilization catalytic enzyme characteristics, But also functions expressed through interaction with external factors such as acidity and selective permeability.

Therefore, attempts have been made to improve the efficiency of the filter media by implementing a multifunctional filter medium having a variety of functions using a polymer compound having different functions as a fiber forming component, but generally have different functions Polymeric compounds are not mixed with each other due to lack of compatibility and even if they are mixed with diarrhea, they can lose their inherent functionality due to chemical / physical reaction between them. Therefore, There is a difficult problem. In addition, since a part of the polymer compound in the mixing process of the polymer compound is mixed with the polymer compound of the other kind, the advantageous heterogeneous functionality is not expressed, and an unintended secondary adverse effect or reaction can be caused, There is a concern that the reliability and predictability of the filter media implemented thereby may be considerably deteriorated.

Accordingly, it is urgently required to realize a multifunctional filtration medium by using a polymer compound having a different functionality and to develop a filtration medium that minimizes the shape, structure, and damage of the filter medium even in a back washing process performed at a high pressure It is true.

Patent No. 10-0871440

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a filter material having at least two or more functionalities and a method of manufacturing the same.

Further, the present invention provides a filter medium having a large flow rate and a high processing speed as the flow path is smoothly secured while minimizing the shape, structure, and damage of the filter medium material during the water treatment operation by improving the mechanical strength, .

It is another object of the present invention to provide a filter material having excellent durability and a method of manufacturing the same, which can secure a flow path even under high pressure applied in a backwashing process and minimize delamination, damage to the membrane and the like.

It is another object of the present invention to provide a flat filter unit and a filter module that can be applied in various fields in the field of water treatment through a filter material having excellent water permeability and durability.

According to an aspect of the present invention, there is provided a nanofiber web having a three-dimensional network structure formed by a porous first support and a cover layer including a functional material disposed on one surface of the first support, As shown in Fig.

According to an embodiment of the present invention, the nanofiber includes a fiber-forming polymer compound, and the functional material may be a fiber-forming polymer compound, a functional polymer compound, or a polymer compound selected therefrom.

In addition, the nanofiber web is divided into a first region to a third region in a thickness direction from a surface in contact with the first support, and the first region to the third region satisfy the following equations (1) to (3) To 1.02 can be satisfied.

[Equation 1]

&Quot; (2) "

&Quot; (3) "

In addition, the nanofiber web may include a plurality of pores formed by intersections of the nanofibers, and the first to third regions may satisfy the following expressions (4) to (6): 0.98 to 1.02.

&Quot; (4) "

&Quot; (5) "

&Quot; (6) "

The fluorine-containing compound may be at least one selected from the group consisting of polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene (EPE) based, tetrafluoroethylene-ethylene copolymer (ETFE) based, tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (ECTFE), and polyvinylidene fluoride (PVDF), based on the total amount of the compound of the present invention.

In addition, the nanofiber may include a first polymer compound that is a hydrophilic polymer compound, and the coating layer may include a second polymer compound that is a hydrophobic polymer compound.

Also, the nanofiber web may be an air electrospun nanofiber web.

The nanofiber web may further include a porous second support interposed between the first support and the nanofiber web, respectively disposed on the first support and the lower support.

The thickness of the first support may be 90% or more of the total thickness of the filter media.

In addition, the first support and the second support may be any one of a nonwoven fabric, a woven fabric, and a knitted fabric.

The basis weight of the first support may be 250 to 800 g / m 2, and the thickness may be 2 to 8 mm.

And a second composite fiber including a support component and a low melting point component and arranged such that at least a part of the low melting point component is exposed to the outer surface, wherein a low melting point component of the second composite fiber is fused to the nanofiber web .

The first support of the filter media includes a first composite fiber including a support component and a low melting point component such that at least a part of the low melting point component is exposed on the outer surface, Component and the low melting point component of the second composite fiber, the first support and the second support may be bonded together.

In addition, the nanofiber web may have an average pore size of 0.1 to 3 μm and a porosity of 60 to 90%.

In addition, the nanofibers forming the nanofiber web may have an average diameter of 50 to 450 nm.

The basis weight of the second support may be 35 to 80 g / m 2, and the thickness may be 150 to 250 탆.

(1) a first spinning solution containing a functional material is spun through an outer tube of a spinning nozzle including an inner tube and an outer tube to form a nanofiber formed nano-fiber Fabricating a fibrous web; And (2) disposing the nanofiber web on both sides of the first support; The present invention also provides a method for manufacturing a filter medium including the filter medium.

According to an embodiment of the present invention, the spinning nozzle further includes an outermost tube, and the step (1) may further spray air onto the outermost tube to produce a nanofiber web.

The step (2) may further comprise laminating a second support and a nanofiber web, wherein the second support of the laminated second support and the nanofibrous web contact both surfaces of the first support As shown in FIG.

In the step (1), the second spinning solution containing the fiber-forming polymer compound is radiated to the inner tube, and the first spinning solution containing at least one of the fiber-forming polymer compound and the functional polymer compound as the functional material And can be radiated to the outer tube.

The present invention also provides a flat filter unit comprising the above-described filter medium and a support frame for supporting the edge of the filter medium, and a flow path for allowing the filtrate filtered out from the filter medium to flow out.

Further, the present invention provides a filter module in which the plurality of flat filter units are spaced apart from each other at a predetermined interval.

According to the present invention, a polymer compound having different functions can be used as a fiber-forming component or a functional additive to perform various functions in a single filter medium. The thickness of the nanofiber composing the nanofiber web, Is uniform, and the yarn rejection ratio of the nanofiber can be remarkably lowered. In addition, the shape, structure deformation, and damage of the filter media are minimized during the water treatment operation, and the flow passage can be smoothly secured, so that a high flow rate can be obtained. In addition, due to the excellent durability of the filter media, even at high pressure applied during backwashing, it has a prolonged service life and improved hydrophilic properties, and thus can be applied in various water treatment fields due to its excellent water permeability.

FIG. 1A is a cross-sectional view showing a filter media in which a nanofiber web is disposed on both sides of a first support, FIG. 1B is a cross-sectional view of a second support, Fig. 1C is a perspective view showing a nanofiber including a covering layer, Fig.
FIG. 2 is a photograph of the swollen filter material after the washing liquid is trapped inside the filter material after being separated from the filter material by the backwashing process,
Fig. 3 is a schematic view showing direct lapping of the first support and the nanofiber web,
4A and 4B are schematic views illustrating the filter media according to an embodiment of the present invention. FIG. 4A is a view showing the nano-fiber web and the second support joined together. FIG. 4B is a cross- 2 < / RTI > support disposed on both sides of the first support,
5A and 5B are diagrams of nanofiber webs included in one embodiment of the present invention. FIG. 5A is a photograph of a surface electron microscope of the nanofiber web, FIG. 5B is a cross-sectional electron micrograph of the nanofiber web, 5c is a graph of the fineness distribution of the nanofibers provided in the nanofiber web, FIG. 5d is a graph of the pore size distribution of the nanofiber web,
FIG. 6 is a cross-sectional electron micrograph of a filter media included in an embodiment of the present invention,
FIG. 7A is a perspective view of the filter unit, FIG. 7B is a schematic view showing a filtration flow on the basis of a cross-sectional view along the line XX 'of FIG. 7A,
FIG. 8 is a schematic view showing a double nozzle according to an embodiment of the present invention, and FIG. 8B is a schematic view showing a triple nozzle according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification. The term "nano" as used herein also refers to nanoscale, and may include microunits. In the present invention, a nanofiber web in which a plurality of nanofibers are spun through electrospinning in a spinning solution to form a structure is defined as a void space between the nanofiber webs constituting the nanofiber separation membrane. The pore size, thickness, and porosity of the water-treating nanofiber-graphene membrane of the present invention are defined as pore size, thickness, and porosity after the nanofiber web is laminated and heat-treated.

1A to 1C, a filter media 1000 according to an embodiment of the present invention includes a porous first support 130 and a first support 130 disposed on one side of the first support 130, The coating layers 111a ₁ and 112a ₁ are embodied as nanofiber webs 111 and 112 of a three-dimensional network structure formed by nanofibers 111a and 112a surrounding the outer surface.

At this time, the nanofiber webs 111 and 112 may be disposed on the upper and lower surfaces of the first support body 130, respectively, and the porous second supports 121 and 122 interposed between the first support body and the nanofiber web In this case, the filtrate filtered through the nanofiber webs 111 and 112 may have a filtration flow in the direction of the first support 130.

Generally, the materials used for the filtering medium of the filter material for water treatment such as the nanofiber webs 111 and 112 include polyamide (PA), polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF) Polymer compounds such as sulfone (PSF), cellulose acetate (CA), and PTFE may be selected, but ceramics or metals may be selected. However, considering cost competitiveness, processability and productivity of the product material, % ≪ / RTI >

At this time, since the performance of the filter medium implemented with the polymer compound is determined by the water permeability and selectivity of the filter media, efficiency of the filter media can be improved by efficiently selecting the polymer compound having various functions. That is, by using a polymer compound having different functions as a fiber forming component or a functional additive, a multifunctional filter medium in which various functions are combined can be implemented to improve the efficiency of filter media.

Accordingly, the filter media according to the present invention is characterized in that the nanofibers 111a and 112a include a fiber-forming polymer compound, and the coating layers 111a ₁ and 112a ₁ are fiber-forming polymer compounds or functional polymer compounds, It is possible to prevent deterioration of physical properties due to nonuniform mixing of the different polymer compounds and further to prevent the deterioration of the physical properties of the nanofibers 111a and 112a and the interface between the nanofibers 111a and 112a and the coating layers 111a ₁ and 112a ₁ It is possible to realize at least two kinds of polymer compounds having a function to improve the efficiency of the filter media by uniformly mixing each of the different polymer compounds separately and in a single filter medium.

At this time, the functional additive preferably has not only the functionality expressed by the properties of the polymer compound itself such as heat resistance and chemical resistance but also the external factors such as mechanical strength, ion exchange property, immobilization catalytic enzyme characteristic, separability, May be a well-known functional additive having a function to be expressed through the action. That is, the functional additive may be selected from the group consisting of heat resistance improvers, dispersants, chemical resistance improvers, strength enhancers, catalysts, detachability improvers, permeability improvers, or an additive including at least one of them.

The fiber-forming polymeric compound may be a known fiber-forming component that forms the nanofibers 111a and 112a, and may be selected as a fiber-forming component including a fluorine-based compound. The fluorine-based compounds include, for example, polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) , Tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (EPE) type, tetrafluoroethylene-ethylene copolymer (ETFE) type, polychlorotrifluoroethylene (PCTFE) type, chlorotri (ECTFE) system and polyvinylidene fluoride (PVDF) system, and more preferably, it may contain at least one compound selected from the group consisting of nanofibers 111a and 112a can be easily mass-produced, and can be polyvinylidene fluoride (PVDF) in terms of excellent mechanical strength and chemical resistance. When the nanofibers 111a and 112a include PVDF as a fiber forming component, the weight average molecular weight of the PVDF may be 10,000 to 1,000,000, preferably 300,000 to 600,000, but is not limited thereto.

On the other hand, a filter medium formed of nanofibers electrified with polyvinylidene fluoride (PVDF) as a fiber-forming component generally has excellent chemical resistance due to its small number of properties, but has a low affinity to water, There is a problem that the transmittance is lowered. In order to solve this problem, studies on hydrophilized or wet out treatment that imparts hydrophilic properties to filter media have been introduced. However, since water molecules can act as plasticizers, mechanical strength and thermal stability There are aspects that are not suitable for this required filter field. Similarly, there is a chemical modification method for imparting the hydrophilic property of the filter media. However, there is a problem of uniformity and durability of the surface, and further post-treatment process is required, which leads to a problem of low productivity and long time. Furthermore, chemically modified filter media may have disadvantages in terms of mechanical strength and chemical stability.

The nanofibers 111a and 112a and the coating layers 111a ₁ and 112a _{1 are} formed of a first polymer compound and a second polymer compound, respectively, in order to realize a filter medium having both hydrophilic and hydrophobic characteristics, And a second polymer compound, wherein the first polymer compound includes a hydrophobic polymer compound and the second polymer compound includes a hydrophilic polymer compound. In this case, the hydrophilic property and the hydrophobic property are expressed at the same time without any additional hydrophilization process or chemical modification process, thereby exhibiting a water permeability and filtration efficiency higher than a certain level, and at the same time, It can be used in various industries.

At this time, the fiber forming component contained in the first polymer compound has a hydrophobic property, does not cause deterioration in the water permeability and selectivity of the filtration media, and has a known fiber forming component which does not affect the durability and mechanical strength of the filter medium Can be used without limitation. For example, a fiber forming component comprising at least one polymer compound selected from polyvinylidene fluoride, polyethylene sulfone, polyurethane and the like can be selected.

The fiber forming component contained in the second polymer compound has a hydrophilic property and a known fiber forming component may be used as long as it does not affect the physical properties of the filter medium as described above. For example, a fiber-forming component containing at least one polymer compound selected from polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide and the like can be selected.

As described above, the filter media according to an embodiment of the present invention includes nanofiber webs 111 and 112 formed of nanofibers 111a and 112a having hydrophobic properties and coating layers 111a ₁ and 112a ₁ having hydrophobic properties, , It is possible to realize a multifunctional filter material which can utilize the advantages of the hydrophobic filter medium and the hydrophilic filter medium at the same time. That is, according to the embodiment of the present invention described above, it is possible to secure excellent chemical, thermal and biological stability or mechanical strength as a hydrophobic filter medium, and to provide an easy control and high water permeability of the contaminant as a hydrophilic filter medium It is possible to realize a multi-functional filter material to be simultaneously expressed.

At this time, the average diameter of the nanofibers 111a and 112b and the diameter of the coating layers 111a ₁ and 112a ₁ may have a ratio of 1: 0.2 to 0.8, and preferably a ratio of 1: 0.3 to 0.6 have. As described above, in the case where the nanofibers 111a and 112a and the coating layers 111a ₁ and 112a ₁ include hydrophobic and hydrophilic polymer compounds according to an embodiment, the characteristics of the hydrophobic filtering medium and the hydrophilic filtering medium The diameters of the nanofibers 111a and 112a and the coating layers 111a ₁ and 112a ₁ forming the nanofibers 111a and 112b must have a constant ratio. That is, if the diameters of the nanofibers 111a and 112a and the diameters of the coating layers 111a ₁ and 112a ₁ are less than 1: 0.2, the content of the hydrophilic polymer composing the coating layers 111a ₁ and 112a ₁ is The chemical and mechanical stability may be deteriorated due to the small size, which may cause problems in the durability and stability of the filter media. If the diameters of the nanofibers 111a and 112b and the diameters of the coating layers 111a ₁ and 112a ₁ are in excess of 1: 0.8, the content of the hydrophilic polymer composing the nanofibers 111a and 112a is The permeability can not be improved as much as desired, and it may be relatively disadvantageous to control the pollutants.

Meanwhile, the nanofiber webs 111 and 112 according to the present invention may be air-spun nanofiber webs 111 and 112. That is, according to the present invention, air is jetted from the outer periphery of the spinneret when electrospinning is performed by air electrospinning according to a manufacturing method described later, and air is collected and accumulated in a spinning solution composed of a volatile fiber forming component , Nanofiber webs (111, 112) having higher mechanical strength can be produced, and radiation troubles that may occur due to nano-unit microfine fibers can be minimized. Further, by adjusting the air jetting pressure or the temperature and humidity spraying conditions, the size and porosity of the pores of the nanofiber webs 111 and 112 can be easily controlled and the water permeability and mechanical strength of the filter media . ≪ / RTI >

When the nanofibers 111a and 112a are spun by the air-spinning method to form the nanofibers webs 111 and 112, the nanofibers 111 and 112 are formed on the nanofibers 111a and 112a forming the nanofibers 111 and 112, The thicknesses of the coating layers 111a ₁ and 112a ₁ can be uniformly realized.

In this case, the nanofiber webs 111 and 112 may be divided into a first region to a third region in a thickness direction from a surface in contact with the first support, and the first region to the third region may be represented by the following Equations 1 to Mathematical Expressions And the value of Equation 3 may be 0.98 to 1.02, respectively.

[Equation 1]

&Quot; (2) "

&Quot; (3) "

If the values of the above Equations 1 to 3 are less than 0.97 or more than 1.02, the thicknesses of the nanofibers 111a and 112a and the coating layers 111a ₁ and 112a ₁ in the respective regions are different, It may be difficult to easily control the material treatment or the like, and further, it may not be easy to quantitatively control the advantageous effect of the polymer compound having the different functions of the present invention.

In the first to third regions, the values of the following equations (4) to (6) may be 0.98 to 1.02, respectively.

&Quot; (4) "

&Quot; (5) "

&Quot; (6) "

In general, the uniformity of the average pore diameter of the fibrous web can be an index indicating that the nanofibers are uniformly radiated without being refracted during the spinning process. In particular, the present invention can be applied to the nanofibers 111a and 112a through air- So that the values of the equations (4) to (6) can be 0.98 to 1.02. That is, since the average pore size in each region of the nanofiber webs 111 and 112 is uniform and the nanofibers 111a and 112a are not refracted, the water permeability as a filtering medium is improved, It is possible to improve the property. Further, the present invention may be more advantageous for quantitatively controlling the advantageous effect of the desired polymer compound having different functions.

The nanofibers 111a and 112a may have an average diameter of 0.05 to 1 탆 and an aspect ratio of 1,000 to 100,000, but the present invention is not limited thereto. For example, the nanofibers 111a and 112a provided in the nanofiber webs 111 and 112 may include a first nanofiber group having a diameter of 0.1 to 0.2 μm, a second nanofiber group having a diameter of 0.2 to 0.3 μm and a second nanofiber group having a diameter of 0.3 And the third nanofiber group having a thickness of about 0.4 占 퐉 may be included in an amount of 35% by weight, 53% by weight, and 12% by weight based on the total weight of the nanofiber web 111, respectively.

The thickness of the nanofibrous webs 111 and 112 may be 0.5 to 200 mu m, for example, 20 mu m. The porosity of the nanofiber webs 111 and 112 may be 40 to 90%, and more preferably 60 to 90%. The average pore diameter may be 0.1 to 5 占 퐉, more preferably 0.1 to 3 占 퐉, and may be 0.25 占 퐉, for example. The basis weight of the nanofiber webs 111 and 112 may be 0.05 to 20 g / m < 2 > and may be 10 g / m < 2 >, but is not limited thereto and may be appropriately changed in consideration of the desired water permeability and filtration efficiency.

In addition, the nanofiber webs 111 and 112 may be provided in more than one layer in the filter material 1000, and the pore size, pore size, basis weight, and / or thickness of each nanofiber web may be different.

Hereinafter, another configuration of the filter media 1000 will be described in detail.

First, the first support 130 supports the filter material 1000 and forms a large flow path to perform the filtration process or the backwash process more smoothly. Specifically, when a pressure gradient is formed so as to have a lower internal pressure than that of the filter media in the filtration process, the filter media can be squeezed. In this case, since the flow path through which the filtrate flows in the filter media is significantly reduced or blocked There is a problem that a larger differential pressure is applied to the filter filter material and the flow rate is remarkably lowered. In addition, during backwashing, an external force may be applied to expand the filter media toward the outside in both directions. However, the filter media may be damaged due to an external force applied when the mechanical strength is low.

The first support 130 is provided to prevent the above-mentioned problems occurring in the filtration process and / or the backwash process. The first support 130 may be a well-known porous member that is used in the water treatment field and has mechanical strength. For example, The first support may be a nonwoven, fabric or fabric.

The fabric means that the fibers included in the fabric have longitudinal and lateral directions, and the specific structure may be plain weave, twill weave, etc., and the density of warp and weft yarn is not particularly limited. Further, the knitted fabric may be a known knit structure, a weft knitted fabric, a knitted fabric, or the like, and may be, for example, a tricot knitted yarn. 1, the first support body 130 may be a nonwoven fabric having no longitudinal and transverse directional properties on the fibers 130a, and may be a dry nonwoven fabric such as a chemical bonding nonwoven fabric, a thermal bonding nonwoven fabric, an airray nonwoven fabric, a wet nonwoven fabric, , Needle punching nonwoven fabric or melt blown nonwoven fabric may be used.

The first support 130 may occupy a thickness of 90% or more of the total thickness of the filter media as described above in order to exhibit sufficient mechanical strength. For example, the thickness of the first support 130 may be 2 to 8 mm, more preferably 2 to 5 mm, and still more preferably 3 to 5 mm. If the thickness is less than 2 mm, it may not exhibit sufficient mechanical strength to withstand frequent backwashing. Also, when the thickness exceeds 8 mm, the degree of integration of the filter material per unit volume of the module may be reduced when the filter material is implemented as a filter unit described below and a plurality of filter units are implemented by a limited space filter module.

 Preferably, the first support 130 may have a basis weight of 250 to 800 g / m 2, more preferably 350 to 600 g / m 2, while satisfying the thickness condition as described above. If the basis weight is less than 250 g / m 2, it may be difficult to exhibit sufficient mechanical strength, and adhesion with the second support may be reduced. If the basis weight exceeds 800 g / m 2, And it may be difficult to smoothly back-wash due to an increase in pressure difference.

When the first support 130 is formed of fibers such as nonwoven fabric, the fibers may have an average diameter of 5 to 50 mu m, preferably 20 to 50 mu m. In addition, the first support 130 may have an average pore size of 20 to 200 μm and a porosity of 50 to 90%, but the present invention is not limited thereto. In the filtration process and / or the backwash process, There is no restriction as to the degree of porosity and pore size so as to support the webs 111 and 112 to exhibit a desired level of mechanical strength and to smoothly form a flow path at high pressure.

The material of the first support body 130 is not limited if it is used as a support for the separation membrane. By way of non-limiting example, synthetic polymer components selected from the group consisting of polyester based, polyurethane based, polyolefin based and polyamide based; Or a natural polymer component including a cellulose system may be used. However, if the first support has a brittle physical property, it may be difficult to expect a desired level of bonding force in the process of laminating the first support and the second support. This is because the first support has a smooth surface But the surface may be macroscopically roughened while forming the porosity, and the surface formed by the fibers, such as nonwoven fabric, may not have a smooth surface depending on the arrangement of the fibers and the fineness of the fibers, to be. If the remaining portions are bonded while the portion not in contact with the interface between the two layers being bonded is present, delamination may be started due to the non-adhered portion. In order to solve this problem, it is necessary to carry out the lapping process while increasing the degree of close contact between the two layers by applying pressure in both layers. If the brittle physical property is strong, The supporting member may be damaged when applying a larger pressure, so that the material of the first supporting member may be flexible, the material of high elongation may be suitable, and preferably the second supporting member 121, The first support 130 may be a polyolefin-based material.

Meanwhile, the first support body 130 may include a low melting point component to bond with the second support bodies 121 and 122 without a separate adhesive or an adhesive layer. When the first support 130 is the same fabric as the nonwoven fabric, it may be made of the first composite fiber 130a having a low melting point component. The first composite fiber 130a may include a support component and a low melting point component so that at least a part of the low melting point component is exposed on the outer surface. For example, a cis-core type conjugate fiber in which a support component forms a core portion and a low melting point component forms a sheath portion surrounding the core portion, and a side-by-side composite fiber having a low- Lt; / RTI > The low-melting-point component and the support component may be polyolefin-based in view of the flexibility and elongation of the support, as described above. For example, the support component may be polypropylene and the low-melting component may be polyethylene. The melting point of the low melting point component may be 60 to 180 ° C.

Next, the second supporting members 121 and 122 which can be disposed on both sides of the first supporting member 130 will be described.

The second supports 121 and 122 support the nanofibrous webs 111 and 112 to be described later and function to increase the bonding force of the layers provided in the filter media.

The second support members 121 and 122 are not particularly limited as long as they generally serve as a support for the filter media, but they may preferably be woven, knitted or nonwoven fabric. The fabric means that the fibers included in the fabric have longitudinal and lateral directions, and the specific structure may be plain weave, twill weave, etc., and the density of warp and weft yarn is not particularly limited. The knitted fabric may be a known knitted fabric, and may be a knitted fabric, a knitted fabric, or the like, but is not particularly limited thereto. The nonwoven fabric means that the fibers are not oriented in the longitudinal and transverse directions. The nonwoven fabric may be a dry nonwoven fabric such as a chemical bonding nonwoven fabric, a thermal bonding nonwoven fabric, an airlay nonwoven fabric, a wet nonwoven fabric, a spunless nonwoven fabric, a needle punching nonwoven fabric or a meltblown A non-woven fabric manufactured by the above-mentioned method can be used.

The second supports 121 and 122 may be nonwoven fabrics. The average diameter of the fibers forming the second supports 121 and 122 may be 5 to 30 μm. The thickness of the second support bodies 121 and 122 may be 100 to 400 탆, more preferably 150 to 400 탆, still more preferably 150 to 250 탆, for example, 200 탆 .

The second support bodies 121 and 122 may have an average pore size of 20 to 100 μm and a porosity of 50 to 90%. However, the present invention is not limited to this, and it may be possible to support the nanofiber webs 111 and 122 to be described later to develop a desired level of mechanical strength and to prevent the flow of the filtrate flowing through the nanofiber webs 111 and 122 Porosity, and pore size.

The basis weight of the second support bodies 121 and 122 may be 10 to 200 g / m 2, more preferably 35 to 200 g / m 2, and still more preferably 35 to 80 g / m 2. For example, M < 2 >. If the basis weight is less than 10 g / m < 2 >, the amount of the fibers forming the second support distributed on the interface formed with the nanofiber webs 111 and 112 described later may be small. A reduction in area may not be able to produce the desired level of cohesion. Further, the nanofibrous web may not exhibit sufficient mechanical strength to support the nanofiber web, and the adhesion with the first support may be reduced. In addition, if the basis weight exceeds 200 g / m 2, it may be difficult to obtain the desired level of flow rate, and there may be a problem that smooth backwashing is difficult due to an increase in differential pressure.

The second support members 121 and 122 are not limited as far as they are used as a support for filter media. By way of non-limiting example, synthetic polymer components selected from the group consisting of polyester based, polyurethane based, polyolefin based and polyamide based; Or a natural polymer component including a cellulose system may be used.

However, the second supports 121 and 122 may be a polyolefin-based polymer component for enhancing adhesion between the nanofiber webs 111 and 112 described later and the first support 130 described above. If the second support members 121 and 122 are made of the same material as the nonwoven fabric, they may be made of the second composite fiber 121a having a low melting point component. The second composite fiber 121a may include a support component and a low melting point component so that at least a part of the low melting point component is exposed on the outer surface. For example, a cis-core type conjugate fiber in which a support component forms a core portion and a low melting point component forms a sheath portion surrounding the core portion, and a side-by-side composite fiber having a low- Lt; / RTI > The low-melting-point component and the support component may be polyolefin-based in view of the flexibility and elongation of the support, as described above. For example, the support component may be polypropylene and the low-melting component may be polyethylene. The melting point of the low melting point component may be 60 to 180 ° C.

If the first support 130 is embodied as a first composite fiber 130a having a low melting point component to exhibit a further improved bonding strength with the second supports 121 and 122, A more firmly fused portion due to fusion of the low melting point component of the first conjugated fiber 130a and the low melting point component of the second conjugated fiber 121a can be formed at the interface between the two supports 121. At this time, the first composite fiber 130a and the second composite fiber 121a may be made of the same material in terms of compatibility.

As the water treatment process using the filter media is repeated, the foreign substances contained in the for-treatment water adhere to the filter media to form an adherent layer, or they are embedded in the filter media, thereby blocking the flow path and deteriorating the filtering function. There is a problem that the cost of water treatment increases when the filter media is replaced. Accordingly, in order to extend the service life of the filter media, it is necessary to perform a cleaning process of periodically applying physical stimulus to the filter media to adhere to the filter media or to remove impurities contained in the filter media. BACKGROUND OF THE INVENTION [0003] BACKGROUND OF THE INVENTION [0004] BACKGROUND OF THE INVENTION [0005] BACKGROUND OF THE INVENTION [0005] [Background Art] [0005] Backwashing typically involves washing water in a direction opposite to the filtration direction of filter media, It is necessary to supply washing water or air at a pressure higher than the pressure applied to the filter media in the filtration process.

Accordingly, in order for the filter media to have the backwashing ability, it is important that the filter media have such mechanical strength that the filter media is not deformed or damaged even under high applied pressure, and a support for compensating mechanical strength is usually provided in the filter media . Factors that may affect the mechanical strength of the support include the structure of the support, for example, the diameter of the fibers forming the nonwoven fabric when the support is nonwoven, the length of the fibers, the manner of interfiber bonding, thickness and basis weight, The thicker or larger the basis weight, the greater the mechanical strength of the support. Therefore, for example, a nonwoven fabric having a large thickness or a nonwoven fabric having a very large basis weight may be used as a support for designing a filter medium which is resistant to backwashing.

On the other hand, it is preferable that the support has a large pore size so as not to affect the flow of the filtrate of the filter media. The lowering of the flow rate due to the support provided for the purpose of compensating the mechanical strength is very undesirable because it deteriorates the main properties of the filter media. However, when a nonwoven fabric having sufficient mechanical strength is used as a support even though the thickness is thin, the basis weight of the nonwoven fabric is very large, and thus the diameter and porosity of the pores in the nonwoven fabric are inevitably small. As a result, There is a problem that the desired level of flow can not be secured.

Accordingly, the filter support 1000 according to the present invention may have a thickness of 90% or more of the entirety of the filter support material as described above, while securing a sufficient flow passage and securing the mechanical strength of the filter support material. The thickness of the first support body 130 is preferably 95% or more, more preferably 98 to 99.9% of the total thickness of the filter media. If the first support is less than 90% of the total thickness of the filter media, the filter media may not have sufficient mechanical strength to perform backwashing, which may shorten the replacement period of the filter media. In addition, securing the mechanical strength of the first support to such an extent that it is less than 90% of the total thickness of the filter media and sufficient to withstand backwashing is highly desirable because there may be flow interruption and flow reduction of the filtrate due to the first support Can not do it.

However, if the binding force between the nanofiber webs 111 and 112 functioning as filter media and the first support 130 is weak, the durability of the filter media due to backwashing may be deteriorated even though the mechanical strength is excellent. That is, the high pressure applied during backwashing can accelerate the interfacial separation between the layers forming the filter media. In this case, as shown in FIG. 2, There is a problem that the function as the separation membrane can be remarkably reduced or completely lost.

Therefore, the high adhesion between the first support having a considerably increased thickness and the nanofiber web as a filter medium is very important in realizing a filter material exhibiting sufficient durability for frequent backwashing.

In general, a method of attaching the support and the nanofiber web may be performed by using a separate adhesive material or by fusing a low melting point component provided on the support to the nanofiber web to bond the two layers together. However, when the two layers are bonded to each other through a separate bonding material, there is a possibility that the bonding material is dissolved by the for-treatment water, thereby causing a problem of contamination of the filtrate and lowering of water permeability. If the binder material is partially backwashed, the backfill of the filter media or the nanofiber web may peel off and the filter media may be completely lost.

Accordingly, it is possible to employ a method in which the nanofiber web and the support are bonded to each other through fusion (A), and heat and / or heat may be applied to both the support 1 and the nanofiber web 2, Pressure can be applied to bond them. However, when applying heat and / or pressure, consideration must be given to minimizing the physical and chemical transformation of the nanofiber web 2, which acts as a filter media due to the applied heat and pressure, The physical properties such as the flow rate and the filtration rate of the filter material designed at the beginning can be changed when the nano web is physically and chemically deformed.

What should be considered when selecting the heat and / or pressure conditions in the attachment process so that there is no physical / chemical deformation of the nanofiber web 2 can be the material properties of the nanofiber web, the support, such as melting point, thermal conductivity, A low melting point component of the support may be fused to the nanofiber web or a high pressure may be applied even if the melting point is somewhat lower than the melting point so that the low melting point component of the support may be fused to the nanofiber web have.

On the other hand, the material forming the support or the nanofiber web is a polymer compound. Since such a polymer compound has a small thermal conductivity and a very large heat capacity, even if a predetermined heat (H ₁ , H ₂ ) is applied to both sides In order for the heat (H ₁ , H ₂ ) to reach the interface between the nanofiber web 1 and the support 2 to raise the temperature of the low melting point component provided in the support 2 to the melting point, Should be applied. 3, when the thickness of the support 1 is very large, heat (H ₂ ) transmitted from below is transmitted to the vicinity of the interface between the nanofiber web 2 and the support 1, It may take a longer time to raise the temperature of the melting point component to the melting point and it is necessary to apply a larger amount of heat downward to shorten the time. However, when too large heat is applied from below, melting of the low melting point component may occur first in the lower part of the first support, and the shape and structure of the support may be changed.

In this case, the nanofibrous web 2 may be physically / chemically deformed. In this case, the heat (H1) applied to the nanofibrous web 2 may be increased, There is a problem in that the physical properties of the filter media designed in the present invention can not be fully manifested.

Accordingly, the filter media 1000 according to an embodiment of the present invention does not face the first support 130 and the nanofiber webs 111 and 112 directly but interposes the second supports 121 and 122 having a smaller thickness This makes it possible to carry out the interlayer adhesion process more stably and easily and to exhibit a remarkably excellent bonding force at the interface between the respective layers and to minimize delamination and peeling problems even when a high external force is applied due to backwashing or the like.

4a, the second support 3, which occupies less than 10% of the total thickness of the filter media, is different in thickness from the nanofiber web 2 in that the nanofiber web 2 and the first support 1 The heat (H ₁ , H ₂ ) applied above and below the laminated body of the nanofiber web 2 / the second support 3 reaches the interface therebetween, B) is easier than in Fig. In addition, since the amount and time of heat to be applied is more easily controlled than in FIG. 3, it is advantageous to prevent physical / chemical deformation of the nanofiber web 2, ), There is an advantage that the nanofibers can be bonded with excellent adhesive force on the support without changing the physical properties of the nanofiber web 2 designed at the beginning.

The filter material 1000 described above can be manufactured by a manufacturing method described later, but is not limited thereto.

The filter media 1000 according to the present invention includes: (1) a first spinning solution containing a functional material is spun through an outer tube of a spinning nozzle including an inner tube and an outer tube to form a coating layer containing a functional material, Fabricating a nanofiber web formed of fibers, and (2) disposing the nanofiber web on both sides of the first support.

First, in step (1) according to the present invention, (1) a first spinning solution containing a functional material is radiated through an outer tube of a spinning nozzle including an inner tube 10 and an outer tube 20, A nanofiber web formed of a nanofiber formed with a coating layer containing a substance is prepared.

A method of manufacturing nanofibers having a coating layer according to the present invention may be a known spinning method which has a clear interface and prevents mixing of different polymer compounds and spinning. In one embodiment, For example, by performing double nozzle electrospinning. That is, each spinning solution is prepared so as not to mix different polymer compounds, and different spinning liquids are discharged through a double nozzle having an inner tube 10 and an outer tube 20 provided outside the inner tube Electrospinning can be performed. In this case, the nanofiber web formed by the nanofibers forming the interface without mixing the different polymer compounds emitted through the inner nozzle 10 and the outer nozzle 20 can be manufactured.

Here, the nanofibers may be discharged through the inner tube as a second spinning solution containing a fiber-forming polymer compound, and the coating layer may include a first material containing a functional material including a fiber-forming polymer compound and / or a functional polymer compound The spinning solution is discharged through the outer tube to realize the prevention of deterioration of physical properties due to nonuniform mixing of the different polymer compounds, and further, the separation of the different polymer compounds based on the interface between the nanofibers and the coating layer At least two or more kinds of polymer compounds having a function to improve the efficiency of the filter media can be realized in a single filter medium.

For example, the second spinning solution, which is radiated through the inner nozzle 10, may include polyvinyl fluoride as a hydrophobic fiber forming component, and the first spinning solution, which is radiated through the outer nozzle 20, And may include polyvinyl alcohol as a forming component.

The content of the hydrophilic fiber forming component and the hydrophobic fiber forming component and the solvent may be selected so as to be suitable for the industrial group in which the hydrophilic property and hydrophobic property of the prepared filter media are appropriately selected. For example, the hydrophilic fiber forming component, The hydrophobic fiber forming component 1 may have a weight ratio of 0.2 to 1.5. In another embodiment, the spinning solution may contain a fluorine-based compound as a fiber-forming component, and the fluorine-based compound may be contained in the spinning solution in an amount of 5 to 30% by weight, preferably 8 to 20% by weight, If it is less than 5% by weight, it is difficult to be formed into fibers, and even if a film phase is formed by spinning in a droplet state without spinning in the form of fibers during spinning or spinning, many beads are formed and solvent is not volatilized well, The pores may be clogged in the process. If the amount of the fluorine-based compound exceeds 30% by weight, the viscosity increases and the surface of the solution becomes solidified, which makes it difficult to spin for a long period of time.

According to an example, the first spinous liquid and the second spinous liquid may further comprise a solvent.

The solvent may be used without limitation in the case of a solvent which does not affect the radioactivity of the nanofibers described below without forming a precipitate while dissolving the fiber forming component. Preferably, the solvent is selected from the group consisting of? -Butyrolactone, cyclohexanone, , 3-heptanone, 3-octanone, N-methylpyrrolidone, dimethylacetamide, acetone dimethylsulfoxide, and dimethylformamide. For example, the solvent may be a solvent for the mixing of dimethylacetamide and acetone.

For example, the electrospinning device may be manufactured by using an electrospinning device having a single spinning pack with one spinning nozzle, or by using a mass production device It is also possible to use an electrospinning device having a plurality of single spinning packs or a spinning pack having a plurality of nozzles. Also, in the electrospinning method, wet spinning with dry spinning or external coagulation can be used, and there is no limitation with respect to the method.

In this case, in the step (1), the spinning nozzle may be a triple nozzle further including an outermost tube, and air may be further injected into the outermost tube to spin the nanofibers. That is, as shown in FIG. 8B, by providing the outermost tube 30 for radiating air outside the outer tube 20, The thickness of the nanofibers and the coating layer included in the third region can be uniformly formed, and it is possible to prevent the nanofibers from being cut due to the air radiated through the outermost tube 30 and to control the surface roughness, Nanofibers can be obtained.

Next, in step (2) according to the present invention, a step of laminating a first support on one side of the prepared nanofiber web is performed. In this case, before performing the step (2), (2-1) laminating the nanofibrous web and the second support, and (2-2) joining the nanofibrous web and the second support on both sides of the first support so that the second support abuts against the first support. Lt; RTI ID = 0.0 > nanofiber < / RTI > web and a second support.

If the second support is made of low-melting-point compound fibers, the nanofiber web and the second support may be thermally fused to each other through the calendering process. Can be concurrently carried out.

Further, another hot melt powder or hot melt web may be further interposed to bind the second support and the nanofiber web. In this case, the applied heat may be 60 to 190 ° C, and the pressure may be 0.1 to 10 kgf / cm 2, but is not limited thereto. However, components such as hot melt powder, which are separately added for binding, are frequently melted in the laminating process between the support and the support and between the support and the nanofiber to frequently open the pores, thereby achieving the initial designed filter media flow rate It can not be done. In addition, it may dissolve in the water treatment process, which may cause environmental negative problems, so that it is preferable to bond the second support and the nanofiber web without preferably including them.

Next, in step (2) according to the present invention, a step of laminating a first support on one side of the prepared nanofiber web is performed. The step (2) may further include (2-1) disposing a second support and a nanofiber web, and arranging a first support on both surfaces of the second support and the nanofibrous web .

The step (2-1) is a step of laminating a second support and a nanofiber web. When the second support is a low melting point composite fiber, the nanofiber web and the second support are thermally fused It is possible to concurrently carry out the binding through the link.

Further, another hot melt powder or hot melt web may be further interposed to bind the second support and the nanofiber web. In this case, the applied heat may be 60 to 190 ° C, and the pressure may be 0.1 to 10 kgf / cm 2, but is not limited thereto. However, components such as hot melt powder, which are separately added for binding, are frequently melted in the laminating process between the support and the support and between the support and the nanofiber to frequently open the pores, thereby achieving the initial designed filter media flow rate It can not be done. In addition, it may dissolve in the water treatment process, which may cause environmental negative problems, so that it is preferable to bond the second support and the nanofiber web without preferably including them.

Next, a first support may be disposed on both sides of the lapped second support and the nanofibrous web. At this time, the step of laminating the laminated second support and the nanofibrous web and the step of fusing the first support and the second support by applying at least one of heat and pressure may be performed.

As a specific method of applying the heat and / or pressure in the above step, a known method may be adopted. As a non-limiting example, a conventional calendering process can be used, and the temperature of the applied heat is 70 to 190 ° C . When the calendering process is carried out, it may be carried out a plurality of times, for example, a first calendering followed by a second calendering. At this time, the degree of heat and / or pressure applied in each calendering process may be the same or different. (2-1), bonding may be performed through thermal fusion between the second support and the first support, and an additional adhesive or adhesive layer may be omitted.

Next, the present invention includes a filter unit implemented with the filter material manufactured through the above-described manufacturing method.

As shown in FIG. 7A, the filter filter material 1000 may be implemented as a flat filter unit 2000. More specifically, the flat filter unit 2000 includes a filter filter material 1000 and a support frame 1100 for supporting a rim of the filter filter material 1000. In one region of the support frame 1100, A suction port 1110 capable of slanting the pressure difference between the outside and the inside of the main body 1000 can be provided. The filtration liquid filtered through the nanofiber webs 101 and 102 is discharged to the outside through the support 200 on which the second support body and the first support body in the filter media 1000 are stacked, Can be formed.

7A, when a suction force of a high pressure is applied through the suction port 1110, the overflow liquid P, which is disposed outside the filter filter material 1000 as shown in FIG. 7B, And the filtrate Q1 filtered through the nanofiber webs 101 and 102 flows along the flow path formed through the support 200 on which the second support body and the first support body are stacked, And the inflow filtrate Q2 can be discharged to the outside through the inlet 1110. [

7A, a plurality of filter modules may be arranged in a single outer case at a predetermined interval, and the filter module may be stacked / A water treatment apparatus may be constituted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

101, 102, 111, 112: nanofiber web 111a, 112a:
121, 122: second support body 130: first support body
1000: Filter filter media 2000, 2000 ': Filter unit

Claims (22)

A porous first support; And
And a nanofiber web having a three-dimensional network structure formed on one surface of the first support and formed by nanofibers surrounding the outer surface of the coating layer containing the functional material. The method according to claim 1,
Wherein the nanofiber comprises a fiber-forming polymer compound,
Wherein the functional material comprises a polymer compound having at least one of a fiber-forming polymer compound and a functional polymer compound. The method according to claim 1,
Wherein the nanofiber web is divided into a first region to a third region in a thickness direction from a surface in contact with the first support,
Wherein the first to third regions have values of the following Equations (1) to (3) of 0.98 to 1.02, respectively.
[Equation 1]

&Quot; (2) "

&Quot; (3) "

The method of claim 3,
Wherein the nanofiber web comprises a plurality of pores formed at the intersection of the nanofibers,
And the values of the following equations (4) to (6) are 0.98 to 1.02 in the first to third regions, respectively.
&Quot; (4) "

&Quot; (5) "

&Quot; (6) "

3. The method of claim 2,
The fiber-forming polymer compound includes a fluorine-based compound,
The fluorine-based compound may be at least one selected from the group consisting of polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) (EPE) -based, tetrafluoroethylene-ethylene copolymer (ETFE) -based, polychlorotrifluoroethylene (PCTFE) -based, chlorotrifluoroethylene-based, ethylene-hexafluoropropylene-perfluoroalkylvinylether copolymer -Ethylene copolymer (ECTFE) -based and polyvinylidene fluoride (PVDF) -based compounds. The method according to claim 1,
Wherein the nanofiber includes a first polymer compound that is a hydrophilic polymer compound, and the coating layer comprises a second polymer compound that is a hydrophobic polymer compound. The method according to claim 1,
Wherein the nanofiber web is an air-spun nanofiber web. The method according to claim 1,
Wherein the nanofiber web is disposed on upper and lower sides of the first support,
And a porous second support interposed between the first support and the nanofiber web, respectively. The method according to claim 1,
Wherein the thickness of the first support is at least 90% of the total thickness of the filter media. 8. The method of claim 7,
Wherein the first support and the second support are any one of a nonwoven fabric, a fabric, and a knitted fabric. The method according to claim 1,
The first support has a basis weight of 250 to 800 g / m 2 and a thickness of 2 to 8 mm. 6. The apparatus of claim 5, wherein the second support comprises:
And a second composite fiber including a support component and a low melting point component and arranged such that at least a part of the low melting point component is exposed to the outer surface, . 13. The method of claim 12,
Wherein the first support of the filter media comprises a first composite fiber including a support component and a low melting point component so that at least a part of the low melting point component is exposed on an outer surface, Wherein the first support and the second support are bonded by fusion bonding of the low melting point components of the second composite fiber. The method according to claim 1,
Wherein the nanofiber web has an average pore size of 0.1 to 3 占 퐉 and a porosity of 60 to 90%. The method according to claim 1,
Wherein the nanofibers forming the nanofiber web have an average diameter of 50 to 450 nm. 3. The method of claim 2,
The basis weight of the second support is 35 to 80 g / m 2, and the thickness is 150 to 250 탆. (1) a step of spinning a first spinning solution containing a functional material through an outer tube of a spinning nozzle including an inner tube and an outer tube to manufacture a nanofiber web formed of a nanofiber in which a coating layer containing a functional material is formed ; And
(2) disposing the nanofiber web on both sides of the first support; Wherein the filter medium is formed of a metal. 18. The method of claim 17,
Wherein the spinning nozzle further comprises an outermost tube, and the step (1) further comprises injecting air into the outermost tube to produce a nanofiber web. 18. The method of claim 17, wherein the step (2)
Further comprising laminating a second support and a nanofiber web, wherein the second support of the lapped second support and the nanofibrous web is disposed on both sides of the first support to abut the first support. 18. The method of claim 17,
In the step (1), a second spinning solution containing a fiber-forming polymer compound is radiated to the inner tube, and a first spinning solution containing at least one of a fiber-forming polymer compound and a functional polymer compound, (JP) METHOD FOR MANUFACTURING FILTER FILTER EMISSIONED IN PIPE A filter media according to any one of claims 1 to 16, And
A support frame for supporting the rim of the filter media, the filter having a flow path for allowing the filtrate filtered out from the filter media to flow out to the outside; And a second filter unit. The filter module according to claim 21, wherein a plurality of flat plate filter units are spaced apart from each other at a predetermined interval.

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