KR102044030B1 - Filter incluing carbon nanofiber and manufacturing mehtod thereof - Google Patents

Abstract

The present invention relates to a filter using a carbon nanofiber and a manufacturing method thereof. The filter comprises: a first substrate including a stainless steel net; and a web-phase first carbon nanofiber layer stacked on the first substrate, having the fiber diameter of 5-50 nm and a network structure. According to the filter using the carbon nanofiber and the manufacturing method thereof, the collection efficiency of PM 0.1 particles is excellent; thermal resistance is excellent at high temperature; energy consumption and noises are reduced due to low pressure loss; filtering blocking does not occur through back washing; and mass production is possible due to low manufacturing costs.

Description

Filter using carbon nanofiber and manufacturing method thereof {FILTER INCLUING CARBON NANOFIBER AND MANUFACTURING MEHTOD THEREOF}

The present invention relates to a filter using carbon nanofibers and a method of manufacturing the same, more particularly, excellent heat resistance, excellent collection efficiency for fine contaminants less than 300nm, low pressure loss, as well as clogging of the filter network The present invention relates to a filter using carbon nanofibers that do not occur, and a method of manufacturing the same.

Micro-pollutants in the air have a tremendous impact on people's quality of life and are not only a significant health threat to the public, they also affect clocks, direct and indirect radiation forcing, climate and ecosystems.

The fine contaminants are complex mixtures of very small particles and liquid droplets, which are classified into PM2.5 and PM10 based on the size of the particles, which refer to particle sizes of 2.5 μm and 10 μm or less, respectively. Pollutants of PM2.5 are particularly harmful because their small size can penetrate the human bronchus and lungs.

PM2.5 pollutants in the air come from a variety of sources, including vehicle emissions, coal combustion, secondary aerosols, industrial emissions, fire cultivation, open burning of fertilizers, and biomass combustion. Among these, concentrated in urban areas are the combustion of coal, smoke generated from the chimneys of various factories, and the exhaust gas of vehicles.

Therefore, it is effective to install the filter in the exhaust port of the chimney or the vehicle to remove the particles of PM2.5.

As a filter for collecting such PM2.5 particles, a fibrous air filter for collecting particles of PM2.5 by a combination of a thick physical barrier and adhesion was used. This type of filter is generally high porosity and is made of many layers of thick fibers with varying diameters of several microns to several tens of microns. To achieve high efficiency, this type of filter is usually made very thick. The drawback of this filter was that it was bulky and had a high pressure loss.

In addition, the most difficult particle size among the PM2.5 particles is a particle of PM0.1 level having a size of 100 to 300 nm, as shown in FIG. 1, but conventionally, such a fibrous filter could not capture particles of PM0.1.

Meanwhile, carbon nano fiber (CNF) is one of fibrous carbon materials, and carbon nanotubes (CNT), graphene nanoribbon (GNR), fullerene nano whiskers and other carbon materials such as carbon fiber It is a medium sized material. Therefore, the carbon nanofibers are characterized by high thermal conductivity, light weight, strength, chemical resistance, abrasion resistance, heat resistance, thermal elasticity, electrical conductivity, high elastic modulus, excellent vibration damping, as well as the specific surface characteristics of the nanofibers. Nano size, supramolecular arrangement. This makes it possible to manufacture a variety of products.

In spite of these advantages, the conventional carbon nanofibers could not be applied to the filter because the carbon nanofilters have a structure of long fibers extruded from PAN or pitch, which makes it difficult to form a sheet and the fiber diameter is about 5 μm. Particles of PM0.1 cannot be included, and the current method of manufacturing carbon nanofibers, ESD (Electro Spray Deposition), produces not only carbon nanofibers with a fiber diameter of 200 nm, but also increases production costs due to difficulty in mass production. It was because.

Accordingly, there is a demand for the development of a filter that is excellent in collecting efficiency of PM0.1 particles using carbon nanofibers, has low pressure loss, excellent heat resistance, and prevents clogging of the filter network by a cleaning function.

KR 10-2017-0097066 A WO 2015-145880 A1 JP 05637479 B1 CN 106133213 A

Therefore, the object of the present invention is excellent heat resistance can be installed in the exhaust or chimney of the vehicle, excellent collection efficiency for fine contaminants of less than 300nm, as well as the collection of PM0.1 particles, pressure loss Low energy consumption and noise is reduced, does not cause filter network clogging, and provides a filter and a manufacturing method using carbon nanofibers that can be mass-produced.

The filter using the carbon nanofiber of the present invention for achieving the above object, the first substrate comprising a stainless steel mesh, the fiber diameter of 5 to 50nm laminated on the first substrate and having a network structure It characterized in that it comprises a carbon nanofiber layer.

In the first carbon nanofiber layer, the fiber precursor is made of nanofibers on the web by a nanofiber manufacturing apparatus of a zeta spinning manufacturing method, and the manufactured nanofibers are infusible and carbonized by a circulation method of heated steam, The fiber precursor is characterized in that the PAN or phenol resin.

It further comprises a second substrate comprising a stainless steel mesh laminated on the first carbon nanofiber layer.

Between the first substrate and the first carbon nanofiber layer, the fiber diameter is 500 ~ 1,000nm, characterized in that the second carbon nanofiber layer on the web having a network structure is further interposed.

The first base material, or the first base material and the second base material is connected so that two or more unit stainless steel nets are collapsible, and the first base material and the second base material are folded so that the filter is formed in a screen shape as a whole. do.

An auxiliary filter is provided below the screen-shaped filter, wherein the auxiliary filter is a third carbon nanofibrous layer having a web diameter of 500 to 1,000 nm and a network structure laminated on a third substrate including a stainless steel mesh. It features.

The method for producing a filter using carbon nanofibers of the present invention comprises the steps of: preparing a fiber precursor using a nanofiber manufacturing apparatus of a zeta spinning manufacturing method as nanofibers on a web having a fiber diameter of 5 to 50 nm and a network structure; Stacking the manufactured nanofibers on the web on a first substrate connected to be foldable by at least two unit stainless steel meshes, and dissolving and carbonizing the stacked laminates using a circulation method of heating steam; And laminating a second substrate to which at least two unit stainless steel nets are foldable on the infusible and carbonized laminate.

In the infusible and carbonization step, by heating the steam to the nanofibers of the laminate in a circulating manner insolubilized and carbonized, the plurality of the laminate in the heat treatment apparatus is disposed, and the heated steam is generated 200 ~ 300 After impregnating the nanofibers of the laminate at 占 폚, the temperature of the heated water vapor was raised to 1000-1,200 占 폚, and the microwaves were added to the heated water vapor so as to be in a plasma state. Characterized in that.

The filter using the carbon nanofiber according to the present invention and a manufacturing method thereof are excellent in collecting efficiency of PM0.1 particles, excellent in heat resistance at high temperatures, low pressure loss, low energy consumption and noise, and backwashing. ), It is possible to prevent clogging of the filter network, and it has the advantage that mass production is possible with low manufacturing cost.

1 is a graph showing the collection efficiency according to the particle size of the fine contaminants of the conventional fiber filter.
Figure 2 schematically shows a structure for collecting fine contaminants of a conventional fiber filter.
3 is a cross-sectional view of a filter using carbon nanofibers according to a first embodiment of the present invention.
Figure 4 schematically shows the principle of producing a nanofiber on the web using the zeta spinning production apparatus according to the present invention.
5 is a view schematically showing a heating apparatus according to the present invention.
6 and 7 are electron micrographs showing a state that the fine material is adsorbed on the surface of the carbon nanofiber layer of the filter according to the present invention, the state is collected in a network structure.
8 is a view schematically showing a structure for removing contaminants by backwashing a filter according to the present invention.
9 is a cross-sectional view of a filter using carbon nanofibers according to a second embodiment of the present invention.
10 is a cross-sectional view of a filter using carbon nanofibers according to a third embodiment of the present invention.
11 is a view showing a schematic structure of a filter using carbon nanofibers according to a fourth embodiment of the present invention.
12 is a view showing a schematic structure of a filter using carbon nanofibers according to a fifth embodiment of the present invention.
13 is a view schematically showing an installation state of a filter using carbon nanofibers according to a fourth embodiment of the present invention.
14 is a view showing the results of testing the collection efficiency of the filter according to the present invention.

Hereinafter, the present invention will be described in detail.

As for the filter by this invention, as shown in FIG. 3, the 1st base material 1 which consists of a stainless steel net, and the web-shaped agent which has a fiber diameter of 5-50 nm laminated on the said 1st base material 1, and has a network structure. 1 carbon nanofiber layer 2 (hereinafter, abbreviated as first carbon nanofiber layer 2).

This is because the carbon nanofibers manufactured by the conventional electrospinning method have a long fiber structure, which makes it difficult to form a sheet, that is, a web, and can not produce a fiber diameter of 50 nm. It was difficult to collect the particles, the present invention is to solve all these disadvantages through the first carbon nanofiber layer 2 on the web having a fiber diameter of 5 ~ 50nm and a network structure.

That is, since the first carbon nanofiber layer 2 of the present invention has a fiber diameter of about 5 to 50 nm, it is possible to collect fine particles of 300 nm or less, so as to cope with PM0.1, and to reduce energy consumption and noise due to low pressure loss. In addition, since the web has a network structure, fine particles may be collected in a mesh form, and the clogging of the fiber network may be prevented through backwashing or vibration by using the properties of the cleanability of the nanofibers.

The fabrication of the first carbon nanofiber layer 2 on the web having a fiber diameter of 5 to 50 nm and a network structure cannot be prepared by a conventional general ESD method, and the fiber precursor is a nanofiber manufacturing apparatus of a zeta spinning manufacturing method. It is made of nanofibers on the web, and the prepared nanofibers are infusible and carbonized by a circulation method of heated water vapor. Here, the apparatus for producing nanofibers of the Zeta spinnig manufacturing method is a device developed by the present inventor, and is described in detail in WO 2015-145880 A1 (hereinafter, referred to as a 'published patent'). Therefore, a description of a specific method for manufacturing nanofibers using the zeta spinning manufacturing apparatus is omitted, and it is to be noted that such a method is based on a published patent.

The principle of the zeta spinning method described above will be briefly described with reference to FIG. 4. After preparing a liquid polymer solution by heating the polymer as a starting material or dissolving it in a solvent, hot air is supplied through the air heater nozzle. By spraying at a high speed, a high pressure, high temperature air stream and a gentle pressure layer attracted by the high speed, high temperature air stream are generated around the high speed, high temperature air stream. At this time, the hot air is injected at a temperature of 250 ~ 350 ℃ and a speed of 200 ~ 350m / s, the gentle air pressure layer is lower than the atmospheric air atmospheric pressure, is formed of a gentle stream. When the polymer solution is injected into the generated gentle pressure layer through an injection nozzle, the injected liquid polymer solution moves in a state of being placed on the high speed and high temperature air in the gentle pressure layer, and thus the high speed and high temperature. It is introduced into the air, and is drawn in a gentle pressure layer during movement and in a high-speed, hot air to collect the stretched polymer as nanofibers in the collector.

The zeta spinning method of the nanofiber manufacturing apparatus of this type has the advantage that the high cost is not required, unlike the prior art without the influence of the manufacturing environment, the production cost of the nanofibers can be mass produced. In addition, it can be manufactured by controlling the fiber diameter within the range of 5 ~ 1000nm, of course, unlike the conventional method has a network structure in which the nanofibers are randomly laminated, it is possible to manufacture on the web, the thickness control of the nanofiber layer There is an advantage that it is possible.

Here, the fiber precursor is preferably PAN or phenol resin, because the heat resistance of 1,000 ℃ or more is required for use as a filter.

And the solvent used in the use of the production apparatus of the nanofiber is not limited, methanol, ethanol, 1-propanol, 2-propanol, hexafluoroisopropanol, tetraethylene glycol, triethylene glycol, dibenzyl alcohol, dipropylene glycol , Dipropylene glycol, methyl isobutyl ketone, methyl -n-hexyl ketone, methyl -n-propyl ketone, diisopropyl ketone, diisobutyl ketone, acetone, hexafluoroacetone, phenol, formic acid, methyl formate methyl formate Propyl formate, methyl benzoate, dimethyl, diethyl phthalate, dipropyl phthalate, methyl chloride, ethyl chloride, methylene chloride, chloroform, methyl bromide, ethyl bromide, bromide, acetic acid, benzene, toluene, hexane and cyclohexane All can be used. In addition, the amount of the solvent is not limited, too, and may be used in a ratio of 1 to 1,000 parts by weight based on 100 parts by weight of the fiber precursor.

 In addition, the prepared nanofibers on the web is to produce carbon nanofibers through infusibilization and carbonization treatment using a circulation method of heated steam. To this end, the nanofibers on the web are mounted on a mounting network including a stainless steel net, and then a plurality of mounting networks are laminated and arranged in a transverse direction in the heating apparatus. Then, heat water vapor is generated into the heating apparatus to infusify the nanofibers on the web placed on the holding network at 200 to 300 ° C. At this time, the insolubilization time is according to the conventionally disclosed method.

In order to carbonize the infusified nanofibers, the temperature of the heated steam is raised to 1,000 to 1,200 ° C., and microwaves are added to the heated steam to bring the plasma into a plasma state, so that the temperature in the heating apparatus is 1,200 to 1500. Carbonization is carried out at 占 폚. In other words, if you want to raise the temperature in the heating device to the carbonization temperature only by steam, excessive energy is required, and thus the manufacturing cost cannot be lowered. When the temperature of the heated steam reaches about 1,000 ° C., the plasma state can be created by microwaves because the temperature exceeds the critical point of the steam. When the plasma state is reached, the current flows easily to the temperature of the heating device up to 1500 ° C. The phenolic resin is a material that does not exhibit conductivity, and thus conductivity appears through a carbonization process. Thus, the phenol resin is heated to 1,000 ° C. with heated water so that conductivity can be expressed, and then a current is generated by making a plasma state with microwaves.

In addition, after the carbonization treatment in the same manner as described above for about 3 hours, it may be porous treatment. If heating to 3,000 ℃ by plasma alone is not possible, by injecting inert gas argon or nitrogen gas into the device, 2,000 ~ 3,000 The porosity treatment at 占 폚 is possible.

That is, according to this method, the heating water vapor continuously circulates, and thus has less energy, can encapsulate inert gas in the apparatus, and has a merit that carbonization can be performed with only a small amount of energy using plasma. In addition, it has the advantage that mass production of carbon nanofibers is possible in a short time.

The heating device for this purpose, as shown in Figure 5, by laminating the nanofibers in the transverse direction and comprises a heating space for dissolution and carbonization treatment, and a gas circulation line to allow gas to circulate to the heating space, the gas circulation A heated steam generator for supplying heated steam on the line, a microwave generator for generating microwaves, a pump for circulation of the heated steam, and a gas supply unit for supplying inert gas and steam is further provided. That's enough.

That is, the nanofibers are laminated in the heating space part, and the heated water vapor is generated through the heated water vapor generating part to be circulated by the pump in the gas circulation line to infusify the nanofibers and the temperature of the heated steam for carbonization. After raising to about 1,000 ℃, by applying a microwave through the microwave generating unit to be in a plasma state and carbonized at 1200 ~ 1500 ℃, to supply the inert gas through the gas supply unit according to the purpose to be porous.

Here, the mounting net including the stainless steel net can be used as it is as the first base material 1 of the present invention. In addition, the base material provided in the collector of the apparatus for manufacturing nanofibers may be a mounting network including the stainless steel net, and the implementation thereof is not limited.

The carbon nanofibers prepared as described above have a heat resistance temperature of about 3000 ° C., and may have a fiber diameter of about 50 nm level, preferably 5 to 50 nm level, so that the fine particles are not trapped in the fiber space of the material. Since it is adsorbed on the carbon nanofibers by force, it is possible to exhibit high collection efficiency, low pressure loss and large collection amount. In addition, according to this method, it is possible to mass-produce carbon nanofibers having a small fiber diameter at low manufacturing cost.

On the other hand, the present invention can use a stainless steel mesh as the first base material (1), usually carbon nanofibers are adsorbed on the nonwoven fabric base material, but the present invention is a high temperature furnace after the nanofibers, As it will be carbonized, a non-woven fabric that melts by high heat can move smoothly with heated water vapor and uses a stainless steel mesh having excellent durability even at high heat. That is, as described above, the mounting network mounted on the heating apparatus is used as it is as the first base material 1. In addition, the first base material 1 may be provided with a stainless steel frame at the edge portion for the strength, the first base material 1 is laminated in the transverse direction in the heating apparatus even if there is no separate mounting means The carbon nanofiber precursor on the sheet may be placed.

As described above, the filter having the structure as described above, PM 0.1 particles are adsorbed on the surface of the first carbon nanofiber layer 2, and the particles of PM 2.5 are also collected in a mesh structure on the surface, 6 and 7 are electron micrographs showing a state in which particles of PM 0.1 and PM 2.5 are adsorbed and collected on the surface of the first carbon nanofiber layer 2 of the filter according to the present invention.

Since the present invention has a structure in which contaminants are adsorbed on the surface as described above, most foreign matters can be removed by backwashing. As shown in FIG. 8, contaminants are adsorbed on the first carbon nanofilter layer 2 and thus backwashing. Alternatively, the vibrating removes contaminants on the surface and prevents clogging of the filter net, so that it can be used stably for a long time. On the other hand, the conventional filter, as shown in Figure 2, because the contaminants are mixed inside the filter is impossible to remove due to backwash or vibration.

In the filter according to the present invention, as shown in FIG. 9, the first base material is formed on the first carbon nanofiber layer 2 so as to fix the first carbon nanofiber layer 2 formed on the first base material 1. The second base material 1 'having the same configuration as in (1) can be laminated.

In addition, as shown in FIG. 10, the strength of the first carbon nanofiber layer 2 is maintained, and the carbon nanofibers of the first carbon nanofibrous layer 2 penetrate the first base material 1 made of a stainless steel mesh. In order to prevent, the second carbon nanofiber layer 2 'on the web having a network structure of 500 to 1,000 nm in diameter and a network structure between the first base material 1 and the first carbon nanofiber layer 2 is further added. It may be intervened. In addition, it is obvious that the second substrate 1 ′ may be further stacked on the first carbon nanofiber layer 2 of the filter of FIG. 10. Here, the second carbon nanofiber layer 2 ′ has the same structure as the first carbon nanofiber layer 2 only with different diameters of the nanofibers, and thus a detailed description thereof will be omitted. Of course, the first carbon nanofiber layer 2 also uses a nanofiber manufacturing apparatus of a zeta spinning method.

On the other hand, the filter according to the present invention, as shown in Figure 11, in order to minimize the pressure loss is preferably formed in a screen shape as a whole. To this end, when the first base material 1 or the second base material 1 'is applied, the hinge 11 or the like so that at least two unit stainless steel meshes can be folded in both the first base material 1 and the second base material 1'. By having a structure connected to the, through the folds of the unit stainless steel mesh, as shown in Figure 11, the filter may be formed as a whole screen shape. The present invention allows the pressure loss to be lowered to 30 Pa or less through this folding structure. At this time, the filter constituting the screen structure may be additionally interposed with the second carbon nanofiber layer (2 '), as in the previous embodiments, bar implementation is not limited thereto.

In the filter according to the present invention, as shown in FIG. 12, an auxiliary filter 100 may be further provided below the screen of the screen shape of FIG. 11. In this case, the auxiliary filter 100 is a form in which a third carbon nanofiber layer 2 ″ having a fiber diameter of 500 to 1,000 nm and a web structure having a network structure is stacked on a third substrate 1 ″ including a stainless steel net. to be. In the case of the filter having a screen shape as shown in FIG. 11, the filter having the screen shape and the auxiliary filter are essentially spaced apart from each other when the auxiliary filter 100 is provided at the bottom thereof. After adsorbing the particles of PM2.5 by the auxiliary filter 100 having " ", the particles of PM 0.1 that have passed through the third carbon nanofiber layer are separated from the first carbon nanofiber layer 2 by a filter having a folding screen. Will be adsorbed on the surface.

Accordingly, by attaching a vibrator to one side of the auxiliary filter 100, the contaminants of the auxiliary filter 100 are removed by vibration, and the filter of the folding screen structure removes the contaminants by backwashing, without clogging the filter network. The filter can be used for a long time. Particles of PM 2.5 removed by vibration can circulate in the chimney, but are fine and do not cause filter network clogging.

At this time, as shown in Figure 13, the main filter and the auxiliary filter 100 of the folding structure may be in the form provided in the housing opened up and down, of course, the top of the housing is provided with a fan is usually exhaust pressure It is natural that it can be backed up by boosting the fan to help smooth exhaust and reverse the fan at regular intervals.

In addition, the auxiliary filter 100 is installed as needed, it is natural that the installation can be omitted.

In addition, the method of installing it on the chimney can be installed using a large drone, according to the conventionally published method.

Hereinafter, the manufacturing method of the filter by this invention is demonstrated in detail.

The method of manufacturing a filter according to the present invention comprises the steps of preparing a fiber precursor using a nanofiber manufacturing apparatus of a zeta spinning method, using a nanofiber on a web having a fiber diameter of 5 to 50 nm and a network structure, and the web phase Laminating the nanofibers on the first base material 1 to which two or more unit stainless steel nets are foldable, and dissolving and carbonizing the stacked laminates using a circulation method of heating steam; And laminating second substrates 1 'to which the at least two unit stainless steel nets are foldable on the infusible and carbonized laminate.

That is, the method for producing a fiber precursor from the web nanofibers having a fiber diameter of 5 to 50 nm and a network structure using the nano-fiber manufacturing apparatus of the zeta spinning method has been described above sufficiently, and is also fully described by the disclosure patent. The detailed description thereof will be omitted.

And the nanofibers on the web prepared above are laminated on the first base material 1 connected so that two or more unit stainless steel meshes can be folded. At this time, when using the nano-fiber manufacturing apparatus of the zeta spinning manufacturing method, the first step and the second step can be performed simultaneously using the first substrate (1) as the substrate of the device.

Next, when the laminated laminate is infusified and carbonized using a circulation method of heated steam, the nanofibers become the first carbon nanofiber layer 2. The dissolution and carbonization treatment is performed by supplying heated water vapor to the nanofibers of the laminate in a circulating manner, insolubilizing and carbonizing it, and placing a plurality of the laminates in a heat treatment apparatus and generating heated water vapor at 200 to 300 ° C. After impregnating the nanofibers of the laminate in, the temperature of the heated steam is raised to 1000 ~ 1,200 ℃, by applying a microwave to the heated steam to be in a plasma state, the carbonization treatment at 1,200 ~ 1500 ℃ will be.

The second base material 1 'is laminated on the first carbon nanofiber layer 2 to complete the manufacture of the filter.

Here, the description of the infusibilization and carbonization treatment method using the heating device, the first base material 1, the second base material 1 'and the first carbon nanofiber layer 2 have been sufficiently made, and thus the description thereof will be omitted. do.

In addition, by using the nano-fiber manufacturing apparatus of the zeta spinning manufacturing method, the fiber precursor is made of nanofibers on the web having a fiber diameter of 5 ~ 50nm and a network structure, the first connected to the two or more unit stainless steel mesh foldable Before laminating onto the substrate (1), using a nano-fiber manufacturing apparatus of the zeta spinning manufacturing method on the first substrate, the fiber precursor is made of nanofibers on the web having a fiber diameter of 500 ~ 1,000nm and a network structure Naturally, it is possible to stack nanofibers.

In addition, after the folding screen structure is formed through the folding of the first substrate 1 and the second substrate 1 ', the auxiliary filter 100 and the auxiliary filter 100 described above in the lower part of the main filter of the folding structure. Of course, you can install an additional vibrator on one side of the.

In addition, the filter may be embedded in the housing, the upper and lower open, the housing is a square pillar shape in order to easily install the filter of the screen structure, the shape of the object to be installed below the housing corresponding to It is also clear that the additional adapter may be provided, which is obvious in the field to which the technology belongs, and thus does not limit the implementation thereof.

As shown in Figure 14, the filter of the present invention, as shown in the test results by the ASTM F 2299 method, it could be confirmed that the display shows the collection efficiency corresponding to PM0.1.

As described above, the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and the drawings are provided to help the overall understanding of the present invention. In addition, the present invention is limited to the above-described embodiments. In other words, various modifications and variations are possible to those skilled in the art to which the present invention pertains. Therefore, the spirit of the present invention should not be limited to the above-described embodiment, and all the things that are equivalent to or equivalent to the scope of the claims as well as the claims to be described later belong to the scope of the present invention.

1: 1st base material 1 ': 2nd base material
1 ": third substrate
2: first carbon nanofiber layer 2 ': second carbon nanofiber layer
2 ": third carbon nanofiber layer
100: secondary filter

Claims (8)

A first substrate comprising a stainless steel mesh;
A first carbon nanofiber layer on a web having a fiber diameter of 5 to 50 nm and a network structure laminated on the first substrate;
And a second substrate including a stainless steel mesh stacked on the first carbon nanofiber layer.
The first substrate and the second substrate is connected so that two or more unit stainless steel mesh is foldable,
The first carbon nanofiber layer is a filter using carbon nanofibers, characterized in that the nanofibers on the web are infusified by heated water vapor, and then carbonized by heated water vapor in a plasma state by applying microwaves.
The method of claim 1,
The first carbon nanofiber layer is,
The fiber precursor is made of nanofibers on the web by a nanofiber manufacturing apparatus of a zeta spinning method, and the prepared nanofibers are infusible and carbonized by a circulation method of heated steam,
The fiber precursor is a filter using carbon nanofibers, characterized in that the PAN or phenol resin.
delete The method of claim 2,
Between the first substrate and the first carbon nanofiber layer,
A filter using carbon nanofibers, wherein the second carbon nanofiber layer on the web having a fiber diameter of 500 to 1,000 nm and a network structure is further interposed.
The method of claim 1,
A filter using carbon nanofibers, wherein the first base material and the second base material are folded together so that the filter is formed in a screen shape as a whole.
The method of claim 5,
An auxiliary filter is provided below the screen of the screen shape,
The auxiliary filter is a filter using carbon nanofibers, characterized in that the third carbon nanofiber layer on the web having a network structure of 500 ~ 1,000nm fiber diameter is laminated on a third substrate including a stainless steel net.
Preparing a fiber precursor using a nanofiber manufacturing apparatus of a zeta spinning manufacturing method as nanofibers on a web having a fiber diameter of 5 to 50 nm and a network structure;
Stacking the prepared nanofibers on the web on a first substrate connected to be foldable at least two unit stainless steel networks;
Dissolving and carbonizing the laminated laminate using a circulation method of heated water vapor;
Laminating a second substrate to which the at least two unit stainless steel nets are foldable on the infusible and carbonized laminate,
The infusibilization and carbonization step,
After disposing a plurality of the laminate in the heat treatment apparatus, generating the heating steam to infusify the nanofibers of the laminate at 200 ~ 300 ℃, the temperature of the heated steam is raised to 1000 ~ 1,200 ℃, Method of producing a filter using carbon nanofibers, characterized in that the carbonization treatment at 1,200 ~ 1500 ℃ by adding a microwave to the heated steam to a plasma state. delete

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