KR20230089714A - A plasma cleaner system with capacitor filter and plasma reactor for VOC and ozone removal - Google Patents

Abstract

The present invention relates to a plasma cleaner system using a capacitor filter and a plasma reactor, and more particularly, to a plasma reactor for purifying sucked air through plasma discharge; and a capacitor filter for removing ozone contained in air passing through the plasma reactor.

Description

A plasma cleaner system with capacitor filter and plasma reactor for VOC and ozone removal}

The present invention relates to a plasma cleaner system using a capacitor filter and a plasma reactor, and more particularly, to a plasma reactor for purifying sucked air through plasma discharge; and a capacitor filter for removing ozone contained in air passing through the plasma reactor.

Recently, as fine dust has become a social issue and clean air has emerged as an essential condition for improving the quality of life and maintaining health, interest in indoor and outdoor air quality management is growing. Air quality management for facilities is emerging.

Air purifiers can be classified into mechanical, electrical, and complex types according to the method of removing pollutants in the air. According to the application principle, the mechanical type is dry (filter type) and wet type, and the electric type is electrostatic precipitate type, negative ion type, plasma type, and UV photocatalyst. It can be divided into formulas, and complex formulas combine the functions of mechanical and electrical functions.

Among them, the plasma type air purifier removes harmful substances by applying voltage to air molecules to create a plasma state. Active species are generated, and these reactive active species are highly reactive and exhibit a sterilizing effect that promotes the decomposition of harmful substances in the air and removes volatile organic compounds and odors. In addition, high-energy electrons can destroy chemical bonds in organic compounds in the form of direct electron collisions, and ozone has a strong oxidizing effect. This plasma has a much higher sterilizing power than ultraviolet rays and has no risk of damage. The ions generated from the plasma are reduced to oxygen in a short time with strong oxidizing ability, so there is an advantage of not generating residual pollutants. It is strong and irritates the eyes and is poorly soluble in water, so it can easily reach deep and cause pulmonary edema and pulmonary hemorrhage, and can cause changes in genetic factors by acting on DNA or RNA.

On the other hand, in the chemical adsorption filter, substances attached to remove harmful substances form salts through acid-alkali neutralization reactions during purification, and the longer the purification time, the more salts are generated and block the pores of the filter, thereby reducing the pressure loss of the fluid. As a result, there is a problem in that the function of the filter is deteriorated. In addition, the attached acidic and alkaline substances have high volatility, so there is a possibility of secondary contamination due to volatilization.

Therefore, there is a need to develop an air cleaning system capable of improving the risk of dust generation and secondary contamination, which are disadvantages of plasma-induced ozone generation and chemisorption filters.

Korean Patent Registration No. 10-0358262

The present invention is to solve the problems of the prior art, including a plasma reactor for removing mold, bacteria, fine dust, volatile organic compounds, odors, etc. using plasma and a capacitor filter for removing unreacted ozone and oxides. It is an object of the present invention to provide a plasma cleaner system.

In addition, an object of the present invention is to provide a plasma cleaner system excellent in removing harmful gases and removing fine dust by forming functional groups by modifying the surface of the capacitor filter and increasing the surface area and porosity.

In order to achieve the above object, the present invention provides a plasma reactor for purifying sucked air through plasma discharge; and

It provides a plasma cleaner system including a capacitor filter for removing ozone contained in the air passing through the plasma reactor.

In one embodiment of the present invention, the capacitor filter is characterized in that it is manufactured by sequentially stacking a capacitor electrode, a dielectric material, and a capacitor electrode.

In one embodiment of the present invention, the capacitor electrode comprises the steps of (a) preparing a coating solution by mixing water, iron oxide hydroxide, and an acrylic resin;

(b) preparing a coated filter by impregnating the filter with the coating solution; and

(c) characterized in that it is produced by the step of drying the coated filter.

In one embodiment of the present invention, the step (a) is characterized in that the coating solution is prepared by mixing 20 to 70 parts by weight of iron oxide hydroxide and 20 to 70 parts by weight of an acrylic resin with respect to 100 parts by weight of water.

In one embodiment of the present invention, after the step (c), (d) the dried coating filter is a diazonium salt having at least one functional group selected from a carboxyl group, a hydroxyl group, a sulfonic acid group, and a phosphoric acid group );

(e) treating the coated filter treated with the diazonium salt with a first copolymer of a silane coupling agent containing an acrylate group and an acrylic acid monomer;

(f) treating the coated filter treated with the first copolymer with a second copolymer of a silane coupling agent containing an acrylate group and 2-hydroxyethyl acrylate (HEA); and

(g) further comprising the step of treating the coated filter treated with the second copolymer with a metal solution.

In one embodiment of the present invention, the step (e) is characterized in that 1 to 10 parts by weight of the first copolymer is used based on 100 parts by weight of the dried coated filter.

In one embodiment of the present invention, step (f) is characterized in that 1 to 10 parts by weight of the second copolymer is used based on 100 parts by weight of the dried coated filter.

The present invention may provide a plasma cleaner system including a plasma reactor for removing mold, bacteria, fine dust, volatile organic compounds, odors, etc. using plasma, and a capacitor filter for removing unreacted ozone and oxides.

In addition, the present invention can provide a plasma cleaner system excellent in harmful gas removal characteristics and fine dust removal characteristics by forming functional groups by modifying the surface of the capacitor filter and increasing the surface area and porosity.

1 shows a capacitor filter of the present invention.
2 shows a manufacturing process of the capacitor electrode of the present invention.
3 shows an optical microscope image of the capacitor electrode of the present invention.
4 shows a SEM image of the capacitor electrode of the present invention.
5 shows the ozone removal test results of the plasma cleaner system of the present invention.
6 shows the THF removal test results of the plasma cleaner system of the present invention.
7 shows the results of toluene removal experiments of the plasma cleaner system of the present invention.

The present invention will be described in detail based on the following examples. The terms, examples, etc. used in the present invention are merely exemplified to explain the present invention in more detail and help the understanding of those skilled in the art, and the scope of the present invention should not be construed as being limited thereto.

Technical terms and scientific terms used in the present invention represent meanings commonly understood by those of ordinary skill in the art to which this invention belongs, unless otherwise defined.

The present invention includes a plasma reactor for purifying sucked air through plasma discharge; and

It relates to a plasma cleaner system including a capacitor filter for removing ozone contained in air passing through the plasma reactor.

The plasma reactor may purify sucked air through plasma discharge.

The plasma reactor removes harmful substances by applying a voltage to air molecules to create a plasma state. In the plasma state, electrons or ions with high energy are formed, and they collide with oxygen, nitrogen, etc. Species are generated, and these reactive active species are highly reactive and exhibit a sterilizing effect that promotes the decomposition of harmful substances in the air, and can remove volatile organic compounds, odors, and odors.

The capacitor filter may remove ozone included in the air passing through the plasma reactor.

The capacitor filter may be manufactured by sequentially stacking a capacitor electrode, a dielectric material, and a capacitor electrode (FIG. 1).

When a positive electrode and a negative electrode are connected to both capacitor electrodes and a voltage is applied, the electrons in the capacitor electrode to which the anode is connected move and gather on the capacitor electrode to which the cathode is connected.

The electrons can remove ozone, volatile organic compounds, oxides, etc. contained in the air.

The capacitor electrode is prepared by (a) preparing a coating solution by mixing water, iron oxide hydroxide, and an acrylic resin;

(b) preparing a coated filter by impregnating the filter with the coating solution; and

(c) may be prepared by drying the coated filter.

The step (a) is a step of preparing a coating solution by mixing water, iron oxide hydroxide, and an acrylic resin, and mixing 20 to 70 parts by weight of iron oxide hydroxide and 20 to 70 parts by weight of an acrylic resin with respect to 100 parts by weight of water to obtain a coating solution. can be produced (Fig. 2).

The iron oxide hydroxide may be FeOOH, α-FeOOH, β-FeOOH, γ-FeOOH, δ-FeOOH, or the like.

As the acrylic resin, polymethyl acrylate, polyethyl acrylate, polymethyl methacrylate, polyethyl methacrylate and the like may be used.

When the contents of the iron oxide hydroxide and the acrylic resin satisfy the above numerical range, the removal efficiency of volatile organic compounds and ozone can be maximized.

In addition, the weight ratio of the iron oxide hydroxide and the acrylic resin is preferably 30 to 70:70 to 30, and when the weight ratio satisfies the above numerical range, the removal efficiency of volatile organic compounds and ozone can be maximized.

In addition, the coating solution may further include iron oxide such as FeO, Fe ₂ O ₃ , Fe ₃ O ₄ , and the content of iron oxide is preferably 2 to 10 parts by weight based on 100 parts by weight of water.

The step (b) is a step of preparing a coated filter by impregnating the filter into the coating solution, and the filter may be a fiber, mat, nonwoven fabric, fabric, or the like.

As the material of the filter, polyolefins such as polyethylene and polypropylene, carbon fiber, polyester, polyamide, and polyurethane may be used without limitation.

The step (c) is a step of drying the coated filter, and the coated filter may be dried at 20 to 150° C. for 1 to 50 hours.

In addition, the present invention, after the step (c), (d) treating the dried coated filter with a diazonium salt having at least one functional group selected from a carboxyl group, a hydroxyl group, a sulfonic acid group and a phosphoric acid group ;

(e) treating the coated filter treated with the diazonium salt with a first copolymer of a silane coupling agent containing an acrylate group and an acrylic acid monomer;

(f) treating the coated filter treated with the first copolymer with a second copolymer of a silane coupling agent containing an acrylate group and 2-hydroxyethyl acrylate (HEA); and

(g) treating the coated filter treated with the second copolymer with a metal solution may be further included.

Step (d) is a step of treating the dried coated filter with a diazonium salt having at least one functional group selected from carboxyl, hydroxyl, sulfonic acid and phosphoric acid groups.

Functional groups such as carboxyl groups, hydroxyl groups, sulfonic acid groups, and phosphoric acid groups formed on the surface of the coating filter through the surface modification can combine with metals, fine dust, or various compounds, and have adsorption properties, harmful gas and fine dust removal properties, and antibacterial properties. etc. can be improved.

The content of the diazonium salt is preferably 1 to 10 parts by weight based on 100 parts by weight of the dried coating filter. The porosity of the manufactured filter is rather small, so that harmful gases and fine dust cannot be effectively adsorbed.

The diazonium salt may be prepared by reacting an aromatic primary amine having at least one functional group selected from a carboxyl group, a hydroxyl group, a sulfonic acid group, and a phosphoric acid group with hydrochloric acid and sodium nitrite.

The step (e) is a step of treating the coated filter treated with the diazonium salt with a first copolymer of an acrylate group-containing silane coupling agent and an acrylic acid-based monomer.

The copolymer may be covalently bonded to the surface of the coated filter or bonded to a functional group introduced by a diazonium salt, through which a plurality of carboxyl groups may be introduced to the surface of the coated filter.

A plurality of carboxyl groups included in the copolymer can bind to metal, fine dust or various compounds, and adsorption properties, harmful gas removal properties, antibacterial properties, and the like can be improved.

The acrylate group-containing silane coupling agent includes 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltri ethoxysilane, 3-acryloxypropyltrimethoxysilane, methacryloxymethyltriethoxysilane, methacryloxymethyltrimethoxysilane and the like.

The acrylic acid monomer is acrylic acid, methacrylic acid, methyl acrylic acid, ethyl acrylic acid, butyl acrylic acid, 2-ethylhexyl acrylic acid, decyl acrylic acid, methyl methacrylic acid, ethyl methacrylic acid, butyl methacrylic acid, 2-ethylhexyl methacrylic acid acid, decyl methacrylic acid, etc.

The weight ratio of the silane coupling agent containing an acrylate group and the acrylic acid-based monomer is preferably 10 to 30:70 to 90.

The first copolymer is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the dried coating filter. If it exceeds parts by weight, it is impossible to effectively adsorb the produced harmful gases and fine dust.

The step (f) is a step of treating the coated filter treated with the first copolymer with a second copolymer of a silane coupling agent containing an acrylate group and 2-hydroxyethyl acrylate (HEA).

The copolymer may be covalently bonded to the surface of the coated filter or bonded to the first copolymer, through which a plurality of hydroxyl groups may be introduced to the surface of the coating.

A plurality of hydroxyl groups included in the copolymer can bind to metal, fine dust or various compounds, and adsorption properties, harmful gas removal properties, antibacterial properties, and the like can be improved.

The weight ratio of the silane coupling agent containing an acrylate group and 2-hydroxyethyl acrylate is preferably 20 to 40:60 to 80, and adsorption characteristics can be maximized within the above range.

The second copolymer is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the dried coating filter. If it exceeds parts by weight, it is impossible to effectively adsorb the produced harmful gases and fine dust.

In addition, in the present invention, the coated filter treated with the second copolymer may be further surface treated with a copolymer of an acrylate group-containing silane coupling agent, an acrylic acid monomer, and 2-hydroxyethyl acrylate (HEA).

The copolymer can be combined with metal, fine dust or various compounds, and can improve adsorption properties, harmful gas removal properties, antibacterial properties, and the like.

The weight ratio of the acrylate group-containing silane coupling agent, the acrylic acid-based monomer, and 2-hydroxyethyl acrylate is preferably 2 to 10:100:20 to 50, and adsorption characteristics can be maximized within the above numerical range.

The copolymer is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the dried coating filter. In this case, it is impossible to effectively adsorb the produced harmful gas and fine dust.

The step (g) is a step of treating the coated filter treated with the second copolymer with a metal solution.

The functional group formed on the surface of the coated filter and the metal of the metal solution may form a metal complex.

As the metal, gold, silver, copper, cobalt, nickel, zinc, platinum, etc. may be used without limitation.

The metal formed on the surface of the coating filter can combine with harmful gases, fine dust, viruses, etc., so that adsorption properties, harmful gas removal properties, antibacterial properties, and the like can be improved.

Metal precursors may be used to form the metal complex, silver nitrate, silver sulfate, silver acetylacetonate, silver acetate, silver carbonate, silver chloride, copper nitrate, copper sulfate, copper acetylacetonate, copper acetate, copper carbonate, copper chloride and the like can be used.

The content of the metal is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the dried coated filter, and adsorption characteristics can be maximized in the above range.

The present invention will be described in detail through Examples and Comparative Examples below. The following examples are only exemplified for the practice of the present invention, and the content of the present invention is not limited by the following examples.

(Example 1)

A coating solution was prepared by mixing 100 parts by weight of water, 48.6 parts by weight of iron oxide hydroxide and 48.6 parts by weight of polymethyl methacrylate.

A carbon nonwoven fabric was immersed in the coating solution for 30 minutes and then taken out to prepare a coated filter.

The coated filter was dried at 25° C. for 24 hours to prepare a capacitor electrode, which was designated as No. 1.

(Example 2)

A capacitor electrode was prepared in the same manner as in Example 1, except that 100 parts by weight of water, 32.4 parts by weight of iron oxide and 64.8 parts by weight of polymethyl methacrylate were used, and this was marked as No. 2.

(Example 3)

A capacitor electrode was prepared in the same manner as in Example 1, except that 100 parts by weight of water, 64.8 parts by weight of iron oxide and 32.4 parts by weight of polymethyl methacrylate were used, and this was marked as No. 3.

(Example 4)

A dielectric was prepared in the same manner as in Example 1, except that 100 parts by weight of water and 20 parts by weight of polymethyl methacrylate were used, and this was marked as No. 4.

3 shows an optical microscope image of the capacitor electrode of the present invention, and FIG. 4 shows a SEM image of the capacitor electrode of the present invention.

It can be seen that iron oxide hydroxide is coated on the surface of the capacitor electrode of the present invention.

5 shows the ozone removal test results of the plasma cleaner system of the present invention. At this time, it was measured at 5-minute intervals for 70 minutes with a 3V voltage.

When the capacitor electrode of No. 3 was used, the best ozone removal characteristics were exhibited.

6 shows the THF removal test results of the plasma cleaner system of the present invention. At this time, it was measured at 30-second intervals for 20 minutes with a 3V voltage.

When the capacitor electrode of No. 3 was used, the best THF removal characteristics were exhibited.

7 shows the results of toluene removal experiments of the plasma cleaner system of the present invention. At this time, it was measured at 30-second intervals for 20 minutes with a 3V voltage.

In the case of using the capacitor electrode of No. 3, the best toluene removal characteristics were exhibited.

(Example 5)

A capacitor electrode was prepared in the same manner as in Example 3, except that 100 parts by weight of water, 15 parts by weight of iron oxide, and 32.4 parts by weight of polymethyl methacrylate were used.

(Example 6)

A capacitor electrode was prepared in the same manner as in Example 3, except that 100 parts by weight of water, 75 parts by weight of iron oxide, and 32.4 parts by weight of polymethyl methacrylate were used.

(Comparative Example 1)

A capacitor electrode was prepared in the same manner as in Example 3, except that polymethyl methacrylate was not used.

Ozone and toluene removal characteristics were measured using the capacitor electrodes prepared in Examples and Comparative Examples, and the results are shown in Table 1 below.

When ozone is generated by operating the plasma reactor of the present invention, the generated ozone is discharged after passing through a capacitor filter. At this time, the ozone removal rate was measured by comparing the concentration of ozone generated and the concentration of ozone discharged after 30 minutes. .

When toluene is injected into the plasma cleaner system of the present invention, the injected toluene is discharged after sequentially passing through a plasma reactor and a capacitor filter. measured.

division Example comparative example One 2 3 5 6 One ozone removal rate
(%) 91 94 98 89 91 72 Toluene removal rate
(%) 78 80 83 71 73 54

From the results of Table 1, it can be seen that Examples 1 to 3, 5 and 6 have excellent ozone and toluene removal properties. In particular, Example 3 has the most excellent properties.

On the other hand, it can be seen that Comparative Example 1 has inferior properties compared to Examples.

Claims (7)

a plasma reactor that purifies the inhaled air through plasma discharge; and
Plasma cleaner system including a capacitor filter for removing ozone contained in the air passing through the plasma reactor.
According to claim 1,
The capacitor filter is a plasma cleaner system, characterized in that manufactured by sequentially stacking a capacitor electrode, a dielectric and a capacitor electrode.
According to claim 2,
The capacitor electrode is
(a) preparing a coating solution by mixing water, iron oxide hydroxide and an acrylic resin;
(b) preparing a coated filter by impregnating the filter with the coating solution; and
(c) a plasma cleaner system characterized in that manufactured by the step of drying the coated filter.
According to claim 3,
The step (a) is
A plasma cleaner system characterized in that a coating solution is prepared by mixing 20 to 70 parts by weight of iron oxide hydroxide and 20 to 70 parts by weight of an acrylic resin with respect to 100 parts by weight of water.
According to claim 3,
After step (c),
(d) treating the dried coating filter with a diazonium salt having at least one functional group selected from a carboxyl group, a hydroxyl group, a sulfonic acid group, and a phosphoric acid group;
(e) treating the coated filter treated with the diazonium salt with a first copolymer of a silane coupling agent containing an acrylate group and an acrylic acid monomer;
(f) treating the coated filter treated with the first copolymer with a second copolymer of a silane coupling agent containing an acrylate group and 2-hydroxyethyl acrylate (HEA); and
(g) the plasma cleaner system further comprising the step of treating the coated filter treated with the second copolymer with a metal solution.
According to claim 5,
The step (e) is
A plasma cleaner system, characterized in that 1 to 10 parts by weight of the first copolymer is used based on 100 parts by weight of the dried coating filter.
According to claim 6,
The step (f) is
A plasma cleaner system, characterized in that 1 to 10 parts by weight of the second copolymer is used based on 100 parts by weight of the dried coating filter.

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