KR101603645B1 - Air Cleaner Using Conductive Filter - Google Patents

Air Cleaner Using Conductive Filter Download PDF

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Publication number
KR101603645B1
KR101603645B1 KR1020150042425A KR20150042425A KR101603645B1 KR 101603645 B1 KR101603645 B1 KR 101603645B1 KR 1020150042425 A KR1020150042425 A KR 1020150042425A KR 20150042425 A KR20150042425 A KR 20150042425A KR 101603645 B1 KR101603645 B1 KR 101603645B1
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KR
South Korea
Prior art keywords
filter
damper
fine dust
air
conductive filter
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KR1020150042425A
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Korean (ko)
Inventor
이혜문
정수호
윤중열
박덕신
Original Assignee
한국기계연구원
한국철도기술연구원
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/38—Particle charging or ionising stations, e.g. using electric discharge, radioactive radiation or flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0032—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions using electrostatic forces to remove particles, e.g. electret filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/32—Transportable units, e.g. for cleaning room air

Abstract

The air filtering apparatus according to an embodiment of the present invention includes a conductive filter having a metal coating layer formed on the surface of unit fibers constituting the nonwoven fabric filter.

Description

Technical Field [0001] The present invention relates to an air filtering apparatus using a conductive filter,

To an air filtering apparatus using a conductive filter.

Most of the air filtration apparatuses for removing fine dust in the room are using a method using a filter. Among the filters used to remove fine dust, the HEPA filter has a high fine dust filtration rate capable of collecting 99.97% of fine dust having a diameter of 0.3 μm. However, since the HEPA filter is expensive and the pressure loss caused by the filter is very high, the power consumption of the air filtering device is also disadvantageously large.

To solve these problems, an air filtration system using a combination of electric field and filtration has been introduced. Typically, a method using a filter in which dielectric fibers exist between two metal electrodes is utilized. This air filtering apparatus uses a composite filter system having a structure in which a filter made of a dielectric material is placed between two electrodes made of a conductive material. However, it is not easy to shake the collected particles, and the number of times the filter can be recycled is relatively small.

In addition, a technique of using a metal filter and a metal foam in which the collecting part is not a dielectric but a grounded or charged particle and a voltage of the opposite polarity is applied is also disclosed. In this case, since the size of the pores of the metal filter or the metal foam used is relatively large, most of the fine dust is collected only by the principle of electric dust collection rather than the mechanism of the filter. Further, there is a problem that the exhaustion after the dust collecting is not easily performed.

An embodiment of the present invention is to provide an air filtration apparatus using a conductive filter.

The air filtration apparatus according to an embodiment of the present invention is characterized in that a metal coating layer is formed on the surface of the unit fibers constituting the nonwoven filter, the porosity is 30% to 90%, the air permeability is 200 cc / cm 2 / sec to 500 cc / cm 2 / sec.

The air filtering apparatus includes an air inlet, an air outlet and a fine dust collecting portion, and the fine dust collecting portion includes a DC high voltage applying device connected to the fine dust collecting portion, the conductive filter, and the fine dust load portion and the conductive filter, An air inlet, a fine dust cover, a conductive filter and an air outlet may be sequentially installed.

The air filtering apparatus further includes a dust removing unit and a damper control unit. The dust removing unit includes a differential pressure gauge for measuring a pressure difference between a front end and a rear end of the conductive filter, a pulse generating device capable of applying a high pressure to the conductive filter, and a fine dust collecting hopper, A first branch duct, a fine dust-collecting front, a conductive filter, a second branch duct and an air outlet are sequentially installed on the main duct, and the pulse generating device is installed on one of the first branch duct and the second branch duct And the fine dust collecting hopper is connected to the other of the first branch duct and the second branch duct and the main duct is provided with a first damper capable of blocking air intake from the air intake port and a second damper A third damper and a fourth damper are provided in the first branch duct and the second branch duct so as to block the connection to the main duct respectively, The first damper and the second damper are opened and the third damper and the fourth damper are closed. When the pressure measured by the differential pressure meter is equal to or higher than the set value, the third damper and the fourth damper And to close the first damper and the second damper.

All of the fine dust particles may be composed of a corona discharging device or an ion generating device.

A voltage of 100 V to 10000 V may be applied to the entire fine dust particles and a voltage of 100 V to 10000 V of the opposite polarity to the voltage applied to the ground or fine dust particles may be applied to the conductive filter.

The pulse generator may be configured with a fan or a compressor, applying a pressure of 1 PSI to 20 PSI to the conductive filter.

The fine dust collecting hopper can be composed of an electric dust collection system, a cleaning system or a filter system.

In the air filtering apparatus using a conductive filter according to an embodiment of the present invention, a metal coating layer is formed on the unit fibers constituting the general nonwoven fabric filter, the thickness of the coating layer is very thin, It is possible to easily exhaust air or gas.

1 is a schematic view schematically showing the configuration of an air filtration apparatus according to an embodiment of the present invention.
2 is a schematic view showing a fine dust collecting part according to an embodiment of the present invention.
3 is an electron micrograph of the conductive filter prepared in Example 1. Fig.
4 is an X-ray analysis result of the conductive filter manufactured in Example 1. Fig.
5 is an electron micrograph of the conductive filter prepared in Example 2. Fig.
6 is an X-ray analysis result of the conductive filter manufactured in Example 2. Fig.
7 is an electron micrograph of the conductive filter prepared in Example 3. Fig.
8 is an X-ray analysis result of the conductive filter manufactured in Example 3. Fig.
9 is an electron micrograph of the conductive filter prepared in Example 4. Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims. Like reference numerals refer to like elements throughout the specification.

Thus, in some embodiments, well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention. Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Whenever a component is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, not the exclusion of any other element, unless the context clearly dictates otherwise. Also, singular forms include plural forms unless the context clearly dictates otherwise.

The air filtering apparatus according to an embodiment of the present invention is characterized in that a metal coating layer is formed on the surface of the unit fibers constituting the nonwoven filter, the porosity is 30% to 90%, the air permeability is 200 cc / cm 2 / sec to 500 cc / cm 2 / sec.

1 is a schematic view schematically showing the configuration of an air filtration apparatus according to an embodiment of the present invention. 1, the air filtering apparatus includes an air inlet 11, an air outlet 12, and a fine dust collector 20.

2 is a schematic view showing a fine dust collector 20 according to an embodiment of the present invention. 2, the fine dust collecting section 20 includes a fine dust-collecting section 21, a conductive filter 22, and a direct current high voltage applying device 23 connected to the fine dust-collecting section 21 and the conductive filter 22 ).

The fine dust receiving section 21 may be constituted by a corona discharge device or an ion generating device. A high voltage direct current of + or - is applied from the direct current high voltage applying device 23 connected to the fine dust bearing portion 21 to charge the fine dust to + or -. Then, by applying a high-voltage direct current opposite to that in the direct current high voltage applying device 23 connected to the conductive filter 22, electric dust collection can be performed. Further, since the conductive filter 22 can perform a fine dust collecting mechanism of a general filter, the dust collecting effect is more excellent. At this time, a voltage of 100 V to 10000 V is applied to the fine dust-proof portion 21, and a ground or a voltage of 100 V to 10000 V may be applied to the conductive filter 22. In this case, the polarity of the voltage applied to the entire fine dust particles and the conductive filter may be opposite to each other.

1, the air inlet 11, the dust-collecting front portion 21, the conductive filter 22, and the air outlet 12 are sequentially installed in the main duct 13.

The conductive filter 22 according to an embodiment of the present invention is very thin since the individual unit fibers constituting the filter are coated with metal on the basis of a general nonwoven filter, so that fine dust does not enter deeply into the filter. Therefore, it is possible to exhaust easily by high-pressure air or gas.

The air filtration apparatus according to an embodiment of the present invention further includes a dust removing unit 30 and a damper control unit (not shown). When fine dust is accumulated in the conductive filter 22 to collect the dust, The discharge of the conductive filter 22 can be automatically performed.

The dust removing unit 30 includes a differential pressure gauge 31 for measuring the pressure difference between the front and rear ends of the conductive filter 22, a pulse generating device 32 capable of applying a high pressure to the conductive filter 22, and a fine dust collecting hopper 33 ).

When the fine dust accumulates in the conductive filter 22, the pressure loss due to the conductive filter 22 is increased, and a pressure difference occurs between the front end and the rear end of the conductive filter 22. The differential pressure gauge 31 measures the pressure difference, and judges that draining of the conductive filter 22 is necessary when the pressure difference becomes equal to or greater than a predetermined value. For example, when the pressure difference between the front end and the rear end of the conductive filter 22 increases by at least 1.5 times the initial pressure difference, the conductive filter 22 is exhausted.

The pulse generating device 32 may be comprised of a fan or a compressor and applies an instantaneous pressure of 1 PSI to 20 PSI to the conductive filter 22 when draining the conductive filter 22. At this time, it may be effective to apply a strong pressure pulse unless the conductive filter is damaged.

The fine dust collecting hopper 33 may be composed of an electric dust collection system, a cleaning system or a filter system.

1, the air suction port 11, the first branch duct 14, the fine dust load section 21, the conductive filter 22, the second branch duct 15, and the second branch duct 15 are formed on the main duct 13, The pulsed generator 32 is connected to one of the first branch duct 14 and the second branch duct 15 and the fine dust collecting hopper 33 is connected to the first branch duct 14 and the second branch duct 15, And may be connected to the other of the branch duct 14 and the second branch duct 15. 1 is an example in which the pulse generating device 32 is connected to the first branch duct 14 and the fine dust collecting hopper 33 is connected to the second branch duct 15. It is also possible that the pulse generating device 32 is connected to the second branch duct 15 and the fine dust collecting hopper 33 is connected to the first branch duct 14 as required.

The main duct 13 is provided with a first damper 16 capable of blocking air intake from the air intake port 11 and a second damper 17 capable of blocking air discharge from the air discharge port 12, The duct 14 and the second branch duct 15 may be provided with a third damper 18 and a fourth damper 19 capable of blocking the connection with the main duct 13. [

The damper control unit (not shown) opens the first damper 16 and the second damper 17 when the pressure measured by the differential pressure meter 31 is less than the set value, and opens the third damper 18 and the fourth damper 19 The third damper 18 and the fourth damper 19 are opened and the first damper 16 and the second damper 17 are closed Can be controlled to be closed.

Through such control, fine dust is collected from the air flowing from the air inlet to the air outlet through the fine dust collector 20, and when minute dust accumulates in the conductive filter 22, the pulse generator 32 So that fine dust collected in the conductive filter can be exhausted by the fine dust collecting hopper 33. [

In the conductive filter according to an embodiment of the present invention, a metal coating layer is formed on the surface of the unit fiber constituting the nonwoven filter. Conductive filters can have varying degrees of porosity and air permeability depending on their needs and capabilities. Specifically, the porosity may be 30% to 90%, and the air permeability may be 200 cc / cm 2 / sec to 500 cc / cm 2 / sec under the condition that the filter test pressure is 100 Pa. More specifically, the porosity may be 50% to 80%, and the air permeability may be 200 cc / cm 2 / sec to 300 cc / cm 2 / sec under the condition that the filter test pressure is 100 Pa.

A metal protrusion may be formed on the metal coating layer formed on the surface of the unit fiber constituting the nonwoven filter. The fine protrusions can be collected more effectively by the metal protrusions formed on the metal coating layer.

The metal coating layer and the metal protrusion can be used without restriction as long as they are generally electrically conductive metals. Specifically, a metal such as aluminum (Al), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), beryllium (Be), magnesium (Mg) ), Barium (Ba), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum ), Manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium ), Palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), cadmium (Cd), mercury (Hg), boron ), Thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), phosphorus (P), arsenic (As), antimony (Sb), bismuth Can be used. More specifically, when considering the corrosion of the metal, aluminum can be used.

The metal coating layer may be formed to a thickness of 10 nm to 500 nm. If the metal coating layer is formed too thick, the pores of the conductive filter become too small, and the fine dust can not be effectively collected. If the metal coating layer is formed too thin, there is a problem that the electrical conductivity is not sufficiently exhibited. Therefore, the thickness of the metal coating layer is appropriately adjusted to the above-mentioned range. More specifically, the metal coating layer may be formed to a thickness of 20 nm to 200 nm.

The particle diameter of the metal protrusion may be 1 nm to 100 탆. If the particle diameter of the metal protrusion is too large, the pores of the conductive filter become too small, and the fine dust can not be effectively collected. If the particle diameter of the metal protrusion is too small, the effect of improving fine dust trapping may not be sufficient. Therefore, the particle diameter of the metal protrusion is suitably adjusted to the above-mentioned range. More specifically, the diameter of the metal protrusion may be 10 nm to 50 mm.

The nonwoven fabric filter may be a nonwoven fabric filter composed of natural fibers or synthetic fibers. Specifically, the unit fiber constituting the nonwoven filter may be a polypropylene, a polyester, a polystyrene, a polyethylene, a polyethylene terephthalate (PET), a Teflon, a cotton, or the like. Can be used.

The unit fiber constituting the nonwoven filter may have a diameter of 0.1 to 100 mm. More specifically, it may be 10 mm to 50 mm.

A method of manufacturing a conductive filter according to an embodiment of the present invention includes the steps of preparing a conductive ink composition including a solvent and a metal precursor, catalytically treating a nonwoven filter, impregnating the nonwoven filter with a conductive ink composition, And reducing or decomposing the metal precursor in the nonwoven fabric filter impregnated with the composition to form a metal coating layer on the surface of the unit fiber constituting the nonwoven filter.

First, a conductive ink composition including a solvent and a metal precursor is prepared.

The metal precursor may be represented by the following formula (1).

[Chemical Formula 1]

M x R 1 y R 2 z

In the general formula (1), M means a conductive metal material, R 1 is a substance that is present together with M to maintain a stable state when M is a precursor, and R 2 is only two elements It is a substance that can be added as a single element or compound to a precursor substance of a conductive substance which is difficult to exist as a stable compound, so as to maintain stability.

In addition, x, y and z mean the number of atoms required for each of M, R 1 and R 2 to exist as a stable compound, x may be 1 to 6, and y may be 1 to 6 And z can be from 0 to 10.

For example, when the metal precursor is AlH 3 , M is Al, R 1 is H, x is 1, y is 3, z is 0 and R 2 is not present. In other examples the metal precursor is AlH 3 O (C 4 H 9) 2 M is Al, R 1 is H, x is 1, y is 3, R 2 is O (C 4 H 9) 2, and z is 1 to be. In some cases, the material corresponding to R 2 may be more than one.

As another example, the metal precursor is Cu 2 (OH 2) 2 ( O 2 C (CH 2) 4 CH 3) 4 in which M is Cu, x is 2, R 1 is OH 2, y is 2, R 2 is OC (CH 2 ) 4 CH 3 , and z is 4.

More specifically, the metal precursor may be a metal hydride, a metal hydroxide, a metal sulfur oxide, a metal nitrate, a metal halide, a complex thereof coordination compound, or a combination thereof

More specifically, the metal precursor is in the form of a metal inorganic salt, and the anion of the metal inorganic salt is selected from the group consisting of hydroxide ion, acetate ion, propionate ion, acetylacetonate ion, 2,6,6-tetramethyl-3,5-heptanedionate ion, a methoxide ion, a sec-butoxide ion, butoxide ion, tert-butoxide ion, n-propoxide ion, i-propoxide ion, ethoxide ion, phosphate Anions such as alkylphosphonate ions, nitrate ions, perchlorate ions, sulfate ions, alkylsulfonate ions, phenoxide ions, bromide ions, An iodide ion, a chloride ion, or a combination thereof. There.

The metal of the metal precursor may be at least one selected from the group consisting of aluminum (Al), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), beryllium (Be) ), Strontium (Sr), barium (Ba), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum ), Tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Ni), Pd, Pt, Cu, Ag, Au, Cd, Hg, B, Ga ), Indium (In), thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), phosphorus (P), arsenic (As), antimony (Sb), bismuth ) Or a combination thereof. Specifically, the metal of the metal precursor may be aluminum.

More specifically, the metal precursor is AlH 3, OAlH 3 (C 2 H 5) 2, OAlH 3 (C 3 H 7) 2, OAlH 3 (C 4 H 9) 2, AlH 3 · N (CH 3) 3, AlH 3 N (CH 3 ) 2 (C 2 H 5 ), AlH 3 tetramethylethylenediamine (TMEDA), AlH 3 dioxane, or a combination thereof.

The solvent can be used without particular limitation as long as it is a solvent capable of uniformly dissolving the metal precursor. (THF), an alcohol solvent, an ether solvent, a sulfide solvent, a toluene solvent, a xylene solvent, a benzene-based solvent, a toluene solvent, A solvent, an alkane solvent, an oxane solvent, an amine solvent, a polyol solvent or a combination thereof may be used. However, the solvent can be selectively used depending on the kind of the metal precursor.

The conductive ink composition comprises 50 to 99 wt% solvent; And 1 to 50 wt% of a metal precursor. This may be in a range suitable for effectively impregnating the conductive ink composition with the individual fibers constituting the nonwoven filter.

The conductive ink composition may further comprise a solution stabilizer. Specifically, the solution stabilizer is selected from the group consisting of diketone, amino alcohol, polyamine, ethanol amine, diethylnol amine, ethane thiol, propane thiol Butane thiol, pentane thiol, hexane thiol, heptanes thiol, octane thiol, nonane thiol, decane thiol, Undecane thiol, or a combination thereof.

The content of the solution stabilizer may be 1 to 50 parts by weight based on 100 parts by weight of the solvent and the metal precursor. This may be a suitable range for coating the conductive ink on the individual fibers constituting the nonwoven filter.

Next, the nonwoven filter is catalytically processed. As a method of catalytic treatment, it is possible to completely expose the nonwoven filter to a catalyst atmosphere.

Examples of the catalyst that can be used at this time include titanium isopropoxide (Ti (Oi-Pr) 4 , titanium chloride (TiCl 4 ), Lindlar catalyst and the like. Lithium aluminum hydride 4), hydrogen (H), sodium-mercury amalgam (Na (Hg)), compounds containing a super-hydride (NaBH 4), Sn 2+ ( SnCl 2 , and so on), a compound containing SO 3 2- (sulfite (Na 2 SO 3 , NaHSO 3 and KHSO 3 ), hydrazine (N 2 H 4 ), zinc-mercury amalgam (Zn (Hg)), diisobutylaluminum hydride (DIBAH), oxalic acid (C 2 H 2 O 4 ), formic acid (HCOOH), ascorbic acid (C 6 H 8 O 6 ), phosphite (PO 3 3- ), hypophosphite 2 PO 2 ) phosphorus acid (H 3 PO 3 ), DTT (dithiothreitol, C 4 H 10 O 2 S 2 ), Fe 2+ ion containing compound (FeSO 4, etc.).

That is, if the metal precursor can be reduced or decomposed into metal particles in the normal temperature range without external energy supply, the conductive fibers can be obtained by leaving the nonconductive fibers in the metal precursor ink at room temperature.

However, if some external energy is required depending on the metal precursor, it can be solved through heat treatment or through a catalyst.

The term " ambient temperature " as used herein means a state in which there is no special external energy supply, and may vary depending on the region, time, and the like.

Next, the nonwoven filter is impregnated with a conductive ink composition. The step of impregnating the conductive ink composition with the individual fibers constituting the nonwoven filter can be carried out by a general method.

For example, the nonwoven filter can be placed in the conductive ink composition such that the conductive ink composition is sufficiently permeable to the individual fibers making up the nonwoven filter. So long as the characteristics of the general nonwoven fabric filter are not damaged.

The nonwoven filter may be a nonwoven filter having various degrees of porosity and air permeability depending on needs and functions. Specifically, the porosity may be 30% to 90%, air permeability can be a 200 cc / cm 2 / sec to about 500cc / cm 2 / sec in the filter condition test pressure of 100Pa. More specifically, the porosity may be from 50% to 80%, and the air permeability may be from 200 cc / cm 2 / sec to 300 cc / cm 2 / sec under the condition that the filter test pressure is 100 Pa. The metal coating layer can be uniformly coated with a very thin thickness through the method of manufacturing a conductive filter according to an embodiment of the present invention. Therefore, the porosity and the air permeability before and after the formation of the metal coating layer on the nonwoven filter are hardly changed.

The diameter of the fibers constituting the nonwoven filter may be from 0.1 mm to 100 mm. More specifically, it may be 10 mm to 50 mm.

Next, the metal precursor in the nonwoven filter impregnated with the conductive ink composition is reduced or decomposed to form a metal coating layer on the surface of the unit fiber constituting the nonwoven filter. The reduction or decomposition of the metal precursor can be carried out by leaving the nonwoven filter impregnated with the conductive ink composition at room temperature. That is, a conductive filter can be obtained without a separate heat treatment process.

Alternatively, the conductive ink composition may be subjected to a heat treatment of a nonwoven fabric impregnated with the conductive ink composition. At this time, the heat treatment temperature may be in a low temperature range where the nonwoven filter is not damaged. For example, it may be 150 DEG C or less.

The non-woven filter impregnated with the conductive ink composition may be heat-treated in an oven or a hot plate by a heat treatment method, or may be heated by immersing the nonwoven filter in a conductive ink.

The formed metal coating layer is very thin, with a thickness of 10 nm to 500 nm, and is uniformly coated on individual fibers constituting the nonwoven filter. More specifically, the metal coating layer may be formed to a thickness of 20 nm to 200 nm.

And drying the nonwoven filter before catalytic treatment of the nonwoven filter. By completely removing moisture contained in the nonwoven filter, the metal coating layer can be uniformly coated on the unit fibers constituting the nonwoven filter.

The step of forming the coating layer may include the steps of: catalytically treating the metal coating layer formed on the surface of the unit fiber; impregnating the non-woven filter with the conductive ink composition again; and reducing or decomposing the metal precursor to form metal protrusions And forming the second electrode layer.

The step of catalytically treating the metal coating layer formed on the surface of the unit fiber can be specifically exposed to a catalyst in a fume state. The entire metal coating layer may be exposed, or the metal coating layer may be partially exposed. The catalyst may be a catalyst of the same type as the catalyst used in forming the metal coating layer.

The impregnation of the conductive ink composition with the nonwoven fabric filter formed with the metal coating layer and the step of forming the metal protrusions on the metal coating layer by reducing or decomposing the metal precursor may be the same as the method used for forming the metal coating layer .

The metal protrusion formed through the above-described steps may have a particle diameter of 1 nm to 100 탆. More specifically, the diameter of the metal protrusion may be 10 nm to 50 mm.

After the step of forming the metal coating layer, washing and drying may be further included. By washing and drying, impurities or impurities that may occur during the formation of the metal coating layer can be removed.

Further, after the step of forming the projections, washing and drying may be further included.

Hereinafter, preferred embodiments and comparative examples of the present invention will be described. However, the following examples are only a preferred embodiment of the present invention, and the present invention is not limited to the following examples.

Example 1

(Having a porosity of 70% and an air permeability of 273 cc / cm 2 / sec (filter test pressure of 100 Pa)) made of polypropylene was treated with titanium chloride at room temperature, and then AlH 3 and dibutyl ether solvent To the aluminum precursor solution at room temperature for 30 minutes, followed by washing and drying. FIG. 3 is an electron micrograph of the conductive filter manufactured in Example 1, and FIG. 4 is an X-ray analysis result of the conductive filter manufactured in Example 1. FIG. As a result, it was confirmed that aluminum was well coated on the surface of each unit fiber constituting the conductive filter.

The electrical resistivity was measured to be 2.315 Ω / □, and there was little difference in pressure loss compared with the filter before aluminum coating.

Example 2

Treated with titanium isopropoxide instead of titanium chloride, and immersed in the aluminum precursor solution for 60 minutes. The rest of the procedure was the same as in Example 1. FIG. 5 is an electron microscope photograph of the conductive filter manufactured in Example 2, and FIG. 6 is an X-ray analysis result of the conductive filter manufactured in Example 2. FIG. As a result, it was confirmed that aluminum was well coated on the surface of each unit fiber constituting the conductive filter.

The electrical resistivity was measured to be 1.835 Ω / □, and there was little difference in pressure loss compared with the filter before aluminum coating.

Example 3

The aluminum precursor solution was immersed in the solution for 120 minutes. The rest of the procedure was the same as in Example 1. FIG. 7 is an electron microscope photograph of the conductive filter manufactured in Example 3, and FIG. 8 is an X-ray analysis result of the conductive filter manufactured in Example 3. FIG. As a result, it was confirmed that aluminum was well coated on the surface of each unit fiber constituting the conductive filter.

The electrical resistivity was measured to be 0.649? /?, And the difference in pressure loss was hardly observed compared with the filter before the aluminum coating.

Example 4

(A porosity of 70% and a ventilation rate of 273 cc / cm 2 / sec (filter test pressure of 100 Pa)) made of polypropylene was treated with titanium chloride at room temperature, and then AlH 3 and dibutyl ether solvent To the aluminum precursor solution at room temperature for 30 minutes, followed by washing and drying. This was catalytically treated with fumed titanium chloride, immersed in the aluminum precursor solution for 30 minutes, and then washed and dried. 9 is an electron micrograph of the conductive filter prepared in Example 4. Fig. As shown in Fig. 9, it can be confirmed that fine protrusions are formed on the aluminum coating layer.

The electrical resistance was measured to be 0.618? / ?, and the difference in pressure loss was hardly observed compared with the filter before the aluminum coating.

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 present invention as defined by the following claims. As will be understood by those skilled in the art. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

11: air inlet 12: air outlet
13: Main duct 14: First branch duct
15; Second branch duct 16: First damper
17: second damper 18: third damper
19: Fourth damper 20: Fine dust collecting part
21: fine dust-collecting part 22: conductive filter
30: discharging part 31: differential pressure gauge
32; Pulse generator 33: fine dust collecting hopper

Claims (7)

Wherein a metal coating layer is formed on the surface of the unit fiber constituting the nonwoven fabric filter, the porosity is 30% to 90%, the air permeability is 200 cc / cm 2 / sec to 500 cc / cm 2 / sec at a filter test pressure of 100 Pa An air filtering device comprising a conductive filter. The method according to claim 1,
Wherein the air filtering apparatus includes an air inlet, an air outlet, and a fine dust collector,
Wherein the fine dust collecting portion includes a direct current high voltage applying device connected to the fine dust bearing portion, the conductive filter, and the fine dust bearing portion and the conductive filter,
Wherein the air inlet, the fine dust-receiving portion, the conductive filter, and the air outlet are sequentially arranged in the main duct. 3. The method of claim 2,
Wherein the air filtering apparatus further includes a dust removing unit and a damper control unit,
The dust removing unit includes a differential pressure gauge for measuring a pressure difference between a front end and a rear end of the conductive filter, a pulse generating device capable of applying a high pressure to the conductive filter, and a fine dust collecting hopper,
Wherein the air duct, the first branch duct, the dust-collecting bottom, the conductive filter, the second branch duct, and the air outlet are sequentially installed in the main duct,
Wherein the pulse generator is connected to one of the first branch duct and the second branch duct, the fine dust collecting hopper is connected to the other of the first branch duct and the second branch duct,
Wherein the main duct is provided with a first damper capable of blocking air intake from the air intake port and a second damper capable of blocking air discharge from the air outlet,
A third damper and a fourth damper are provided in the first branch duct and the second branch duct, respectively, for blocking connection with the main duct,
Wherein the damper control unit opens the first damper and the second damper and closes the third damper and the fourth damper when the pressure measured by the differential pressure meter is less than the set value, The third damper and the fourth damper are opened, and the first damper and the second damper are closed. 3. The method of claim 2,
Wherein all of the fine dust particles are composed of a corona discharge device or an ion generating device. 3. The method of claim 2,
Wherein a voltage of 100 V to 10000 V is applied to the front portion of the fine dust particles and a voltage of 100 V to 10000 V of a polarity opposite to a voltage applied to the ground or the front portion of the fine dust particles is applied to the conductive filter. The method of claim 3,
Wherein the pulse generating device applies a pressure of 1 PSI to 20 PSI to the conductive filter and comprises a fan or a compressor. The method of claim 3,
The fine dust collecting hopper is composed of an electric dust collection system, a cleaning system or a filter system.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102085544B1 (en) * 2019-03-22 2020-03-06 한밭대학교 산학협력단 Air cleaner loaded with movable particle matter filters
KR20200127348A (en) 2019-05-02 2020-11-11 엘지전자 주식회사 Electric dust collector

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Publication number Priority date Publication date Assignee Title
JPH06210115A (en) * 1993-01-19 1994-08-02 Matsushita Seiko Co Ltd Filter and filter unit
JP2001121032A (en) * 1999-10-27 2001-05-08 Ricoh Co Ltd Air cleaner
KR101180908B1 (en) * 2010-05-24 2012-09-07 한국에너지기술연구원 Filters employing porous electrodes coated with insulating materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06210115A (en) * 1993-01-19 1994-08-02 Matsushita Seiko Co Ltd Filter and filter unit
JP2001121032A (en) * 1999-10-27 2001-05-08 Ricoh Co Ltd Air cleaner
KR101180908B1 (en) * 2010-05-24 2012-09-07 한국에너지기술연구원 Filters employing porous electrodes coated with insulating materials

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102085544B1 (en) * 2019-03-22 2020-03-06 한밭대학교 산학협력단 Air cleaner loaded with movable particle matter filters
WO2020196973A1 (en) * 2019-03-22 2020-10-01 한밭대학교산학협력단 Air purifier having movable fine dust filter mounted thereon
KR20200127348A (en) 2019-05-02 2020-11-11 엘지전자 주식회사 Electric dust collector

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