WO2023074959A1 - Échangeur de chaleur pour climatiseur à fonction d'élimination de virus et son procédé de fabrication - Google Patents

Échangeur de chaleur pour climatiseur à fonction d'élimination de virus et son procédé de fabrication Download PDF

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Publication number
WO2023074959A1
WO2023074959A1 PCT/KR2021/015377 KR2021015377W WO2023074959A1 WO 2023074959 A1 WO2023074959 A1 WO 2023074959A1 KR 2021015377 W KR2021015377 W KR 2021015377W WO 2023074959 A1 WO2023074959 A1 WO 2023074959A1
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WO
WIPO (PCT)
Prior art keywords
photocatalyst
heat exchange
heat exchanger
air conditioner
tungsten oxide
Prior art date
Application number
PCT/KR2021/015377
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English (en)
Korean (ko)
Inventor
이용범
Original Assignee
주식회사 다람이엔지
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Application filed by 주식회사 다람이엔지 filed Critical 주식회사 다람이엔지
Publication of WO2023074959A1 publication Critical patent/WO2023074959A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
    • F24F8/167—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using catalytic reactions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present invention relates to a heat exchanger for an air conditioner, and more particularly, to a heat exchanger for an air conditioner having a virus removal function by coating a visible light responsive photocatalyst on the heat exchanger for an air conditioner and a method for manufacturing the same.
  • an air conditioner is installed with a plasma sterilizer or an ozone sterilizer to generate ozone to remove bacteria or viruses.
  • ozone generated from such a plasma sterilizer or ozone sterilizer is known to cause respiratory diseases to humans, and controversy over safety continues.
  • a technology using a photocatalyst is disclosed as another example of a technology for removing bacteria and viruses applied to an air conditioner.
  • the photocatalyst is manufactured in the form of a separate filter and installed in the air conditioner.
  • a separate support for mounting the photocatalyst in the form of a filter and a light source for activating the photocatalyst must be additionally provided there is a problem.
  • an ultraviolet rays lamp was used as a light source for activating the photocatalyst, but there is a problem in that ultraviolet rays cause skin diseases when exposed to humans for a long time.
  • the present invention has been made to solve the above problems, and has a bacteria and virus removal effect by applying a photocatalyst to an air conditioning device, but can be applied without adding a separate device, and bacteria and viruses according to the activation of the photocatalyst It is an object of the present invention to provide a heat exchanger for an air conditioner having a virus removal function and a method for manufacturing the same so that the virus removal effect can be improved.
  • a heat exchanger for an air conditioner having a virus removal function includes a plurality of heat exchange fins arranged spaced apart from each other and a heat exchange tube installed to penetrate the heat exchange fins
  • a visible light responsive photocatalyst is coated on the heat exchange pin.
  • a light source for activating the photocatalyst coated on the heat exchange fin is installed in the heat exchanger, and the light emitted from the light source is reflected to the heat exchange fin between the heat exchange fins coated with the photocatalyst.
  • a reflector is installed for
  • the photocatalyst includes 50 to 95% by weight of titanium oxide; and 5 to 50% by weight of tungsten oxide or copper tungsten oxide.
  • the photocatalyst includes 50 to 95% by weight of titanium oxide; 5 to 50% by weight of tungsten oxide or copper tungsten oxide; and 0.001 to 0.1% by weight of platinum.
  • a method of manufacturing a heat exchanger for an air conditioner having a virus removal function includes a photocatalyst material manufacturing step of manufacturing a visible light responsive photocatalyst material; a photocatalyst material coating step of coating the heat exchange pin with the photocatalyst material; and an assembling step of assembling the heat exchange fin and the heat exchange tube.
  • a titanium oxide material made of titanium hydroxide gel or crystallized titanium oxide and sodium hydroxide solution are added to tungsten oxide oxidized cemented carbide sludge and sodium tungstate obtained by heating the cation a material mixing step of mixing a tungsten oxide material made of a tungsten oxide colloid made by passing through a resin; and a heat treatment step of heat-treating the mixture of the titanium oxide material and the tungsten oxide material at 400 to 600°C.
  • the photocatalyst material coating step may include a primer application step of applying an inorganic primer to the heat exchange pin; a photocatalyst sol manufacturing step of mixing an inorganic binder with the photocatalyst material to prepare a photocatalyst material in a sol state; and a photocatalyst sol coating step of coating the heat exchange pin with the photocatalyst sol.
  • the inorganic binder is polymerized with 20 to 30% by weight of sodium silicate, 5 to 15% by weight of potassium silicate, 50 to 70% by weight of water, and 3 to 7% by weight of a dispersant at a temperature of 250 to 350 ° C. made by reacting
  • the visible light responsive photocatalyst is coated on the heat exchange pin, germs and viruses in the air passing through the heat exchange pin can be removed without the addition of a separate device, and the photocatalyst can be used in general lighting including fluorescent lamps. , since it is activated in the visible light region such as LED and OLED lighting, there is an effect that the bacteria and virus removal performance can be further improved.
  • FIG. 1 is a front configuration diagram of a heat exchanger for an air conditioner having a virus removal function according to an embodiment of the present invention.
  • FIG. 2 is a front configuration diagram of a heat exchanger for an air conditioner having a virus removal function according to another embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for manufacturing a heat exchanger for an air conditioner having a virus removal function according to an embodiment of the present invention.
  • FIG. 1 is a front configuration diagram of a heat exchanger for an air conditioner having a virus removal function according to an embodiment of the present invention
  • FIG. 2 is a view of a heat exchanger for an air conditioner having a virus removal function according to another embodiment of the present invention. It is a front view.
  • the heat exchanger for an air conditioner having a virus removal function (hereinafter, abbreviated as a 'heat exchanger') according to the present invention includes a plurality of heat exchange fins 110 arranged spaced apart from each other. And, in the heat exchanger 100 for an air conditioner including a heat exchange tube 120 installed to pass through the heat exchange fin 110, the heat exchange fin 110 is coated with a visible light responsive photocatalyst 130. to be characterized
  • the photocatalyst 130 is 50 to 95% by weight of titanium oxide; and 5 to 50% by weight of tungsten oxide or copper tungsten oxide.
  • the photocatalyst 130 is 50 to 95% by weight of titanium oxide; 5 to 50% by weight of tungsten oxide or copper tungsten oxide; And 0.001 to 0.1% by weight of platinum; may be made of a mixture containing.
  • the photocatalyst 130 uses titanium oxide and tungsten oxide as main materials.
  • the titanium oxide has been confirmed to be effective as a photocatalyst in the ultraviolet region, but has a disadvantage in that the photocatalytic effect is insignificant in the visible region. That is, since ultraviolet light accounts for only about 4% of sunlight, the efficiency as a photocatalyst is greatly reduced in a room where there is little ultraviolet light.
  • titanium oxide has a photocatalytic effect in the visible light region, but when tungsten oxide is used alone, it is known that it is effective only at a specific wavelength and generally has a low photocatalytic effect in visible light.
  • the visible light responsive photocatalyst 130 is prepared by mixing titanium oxide and tungsten oxide in a certain ratio, the photocatalytic effect in the visible light region is superior to that of titanium oxide and tungsten oxide alone.
  • a light source 140 for activating the photocatalyst 130 coated on the heat exchange fin 110 is installed in the heat exchanger 100 of the present invention, and the photocatalyst 130 is coated.
  • a reflector 150 may be installed between the heat exchange fins 110 to reflect the light emitted from the light source 140 to the heat exchange fins 110 .
  • the light source 140 an LED lamp emitting white light having a wavelength of 400 to 800 nm is used.
  • a plurality of light sources 140 may be arranged along the direction in which the heat exchange fin 110 and the reflector 150 are arranged at the upper and lower portions of the heat exchanger 100, respectively. According to this, when the activity of the photocatalyst 130 due to sunlight is insignificant, the activity of the photocatalyst 130 can be increased using the light source 140 .
  • Both surfaces of the reflector 150 are formed to reflect light so that the light emitted from the light source 140 can be reflected to the two heat exchange fins 110 disposed adjacent to the reflector 150 . According to this, the amount of light applied to the photocatalyst 130 coated on the heat exchange fin 110 can be increased.
  • the reflector 150 is made of a metal plate having the same shape as the heat exchange fin 110 and is configured to function as a heat exchange fin.
  • FIG. 3 is a flowchart of a method for manufacturing a heat exchanger for an air conditioner having a virus removal function according to an embodiment of the present invention.
  • the method of manufacturing a heat exchanger includes a photocatalyst material manufacturing step (S10), a photocatalyst material coating step (S20), and an assembling step (S30).
  • the photocatalyst material manufacturing step (S10) is a step for manufacturing a visible light responsive photocatalyst material, including a material mixing step (S11) of mixing a titanium oxide material and a tungsten oxide material; and a heat treatment step (S12) of heat-treating the mixture of the titanium oxide material and the tungsten oxide material at 400 to 600°C.
  • titanium hydroxide gel obtained by hydrolyzing a titanium metal salt solution or titanium oxide crystallized by heat treatment of titanium hydroxide gel is used as the titanium oxide material.
  • a tungsten oxide colloid is used as the tungsten oxide material by adding sodium hydroxide solution to tungsten oxide obtained by oxidizing cemented carbide sludge and passing sodium tungstate obtained by heating through a cation exchange resin.
  • a colloidal suspension or colloid is a mixture in which an insoluble material having a size of 1 to 1000 nm is dispersed and mixed with other materials, unlike a solution in which a solvent and a solute are completely mixed to form a single phase. Therefore, tungsten oxide colloid is a mixture of tungsten oxide fine particles with other substances in a sprayed state. When such tungsten oxide colloid is mixed with titanium hydroxide gel or titanium oxide, mechanical mixing for a long time is not required, and bonding with titanium oxide is easily achieved.
  • titanium oxide TiO 2
  • the material of titanium oxide (TiO 2 ) is hydrolyzed according to a thermal hydrolysis process after dispersing a titanium metal salt solution in a solvent.
  • the temperature of the thermal hydrolysis is 60 to 100 ° C.
  • the quantitative chemical formula of titanium hydroxide is Ti(OH) 4 , but since Ti-OH bonds and Ti-O bonds are mixed in an amorphous state, it is not expressed as a quantitative chemical formula.
  • the titanium hydroxide gel is washed with water or alcohol, separated and filtered, and used as a photocatalyst material, or the washed titanium hydroxide gel is re-dispersed in water, put into a pressure vessel, and heat-treated, for example, at 100 to 300 ° C. for 100 hours.
  • crystallized titanium oxide can be prepared and used as a photocatalytic material.
  • tungsten oxide colloid is prepared from cemented carbide sludge and used.
  • tungsten oxide colloidal from cemented sludge a process of separating tungsten oxide and the remaining impurities from cemented sludge is required.
  • Produce tungsten sludge the prepared impurity-containing tungsten oxide is put into a solution of an aqueous solution of sodium hydroxide heated to 100° C., stirred while heating to form sodium tungstate, and a process of separating from impurities is performed.
  • the prepared sodium tungstate (sodium tungstate, sodium tungstate) is passed through a cation exchange resin to form a tungsten oxide colloid.
  • Cation exchange resin is a synthetic resin that exchanges its own cations with cations in an aqueous solution. When sodium tungstate is passed through cation exchange resin, cations are exchanged to form tungsten oxide colloid.
  • a second element such as copper may be added to the material of tungsten oxide (WO3).
  • copper is prepared by reacting anhydrous copper chloride (CuCl 2 ) with tungsten oxide in a colloidal state. That is, the addition of copper is produced by reaction with tungsten oxide colloid.
  • the titanium dioxide gel prepared in this way and tungsten oxide colloid (or tungsten oxide colloid to which a second element is added) are mixed in an appropriate ratio and used as a photocatalyst material.
  • the mixing ratio of titanium oxide and tungsten oxide is 50 to 95% by weight of titanium oxide and 5 to 50% by weight of tungsten oxide (or copper tungsten oxide).
  • platinum may be further added as a cocatalyst.
  • Platinum (Pt) may be added to either the titanium oxide sol or the tungsten oxide colloid, but it must be added before synthesizing the titanium oxide and the tungsten oxide colloid. At this time, platinum is added to be 0.001 to 0.1% by weight with respect to the total weight.
  • the titanium oxide containing platinum and tungsten oxide (or copper tungsten oxide) prepared as described above is heat treated through the heat treatment step (S12) to prepare a visible light responsive photocatalyst material.
  • titanium oxide added with platinum and tungsten oxide (or copper tungsten oxide) is heated in a temperature range of 400 to 600 ° C. so that the ratio of anatase (titanium dioxide) is 70% or more. Heat treatment for 2 hours to produce a visible light responsive photocatalyst material.
  • the photocatalyst material coating step (S20) includes a primer application step (S21) of applying an inorganic primer to the heat exchange fins 110; a photocatalyst sol preparation step (S22) of preparing a photocatalyst material in a sol state by mixing an inorganic binder with the photocatalyst material; and a photocatalyst sol coating step (S23) of coating the heat exchange pin 110 with the photocatalyst sol.
  • an inorganic primer is used because the organic material may be decomposed by the activity of the photocatalyst 130 when an organic primer is used. If necessary, before the primer application step ( S21 ) is performed, a step of washing and drying the heat exchange fin 110 may be performed. And, after the primer application step (S21), a step of drying the applied primer may be performed.
  • the photocatalyst material manufactured in the photocatalyst material manufacturing step (S10) is mixed with an inorganic binder to form a sol state.
  • an inorganic binder is used so that the binder is not decomposed by the activity of the photocatalyst 130 like the primer.
  • the inorganic binder is prepared by polymerization of 20 to 30% by weight of sodium silicate, 5 to 15% by weight of potassium silicate, 50 to 70% by weight of water, and 3 to 7% by weight of a dispersant at a temperature of 250 to 350 ° C.
  • the inorganic binder thus manufactured enables the photocatalytic material to be coated on the heat exchange fin 110 made of aluminum without peeling.
  • the photocatalytic sol coating step (S23) may be performed by a gravure coating method suitable for high-speed and mass production. After the photocatalyst sol coating step ( S23 ), a step of drying and curing the photocatalyst 130 coated on the heat exchange pin 110 may be performed.
  • the assembling step (S30) is a step of assembling the heat exchange fin 110 coated with the photocatalyst 130 and the heat exchange tube 120.
  • the assembly of the heat exchange fin 110 and the heat exchange tube 120 may be performed in the same manner as the assembly method used in manufacturing a known heat exchanger.
  • the visible light responsive photocatalyst 130 is coated on the heat exchange pins 110, air passing through the heat exchange pins 110 without adding a separate device. Bacteria and viruses can be removed, and since the photocatalyst 130 is activated in the visible light region of general lighting including fluorescent lamps, LED and OLED lighting, the performance of removing bacteria and viruses can be further improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

La présente invention concerne un échangeur de chaleur pour climatiseur. L'invention concerne un échangeur de chaleur pour climatiseur et son procédé de fabrication, l'échangeur de chaleur pour climatiseur comprenant : une pluralité d'ailettes d'échange de chaleur disposées de manière à être espacées les unes des autres ; et un tube d'échange de chaleur monté de manière à passer au travers des ailettes d'échange de chaleur, les ailettes d'échange de chaleur étant revêtues d'un photocatalyseur sensible à la lumière visible de manière à avoir une fonction d'élimination des virus.
PCT/KR2021/015377 2021-10-28 2021-10-29 Échangeur de chaleur pour climatiseur à fonction d'élimination de virus et son procédé de fabrication WO2023074959A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2021-0145258 2021-10-28
KR1020210145258A KR102459050B1 (ko) 2021-10-28 2021-10-28 바이러스 제거기능을 갖는 공기조화장치용 열교환기 및 그 제조방법

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WO2023074959A1 true WO2023074959A1 (fr) 2023-05-04

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005300110A (ja) * 2004-04-15 2005-10-27 Daikin Ind Ltd 空気調和機の室内機
JP2008164238A (ja) * 2006-12-28 2008-07-17 Sumitomo Light Metal Ind Ltd 熱交換器用アルミニウムフィン材及びそれを用いた熱交換器
KR101146899B1 (ko) * 2010-05-24 2012-05-15 인하대학교 산학협력단 산화티탄 및 금속텅스텐산화물 접합구조의 광촉매제 및 이의 제조방법
JP2017512294A (ja) * 2014-02-26 2017-05-18 エルジー エレクトロニクス インコーポレイティド 可視光線用光触媒装置が備えられる家電製品
KR101973990B1 (ko) * 2018-01-16 2019-04-30 주식회사 임금님명품침대가구 게르마늄이 함유된 브래지어용 패드의 제조방법 및 이에 의해 제조된 브래지어용 패드
JP2020032405A (ja) * 2018-08-27 2020-03-05 シャープ株式会社 光触媒組成物
KR102307194B1 (ko) * 2019-12-23 2021-09-30 주식회사 유웰 가시광 영역에서 작용하는 광촉매 필터를 이용한 차량용 공기 청정기

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050080392A (ko) 2004-02-09 2005-08-12 주식회사 티오즈 광촉매가 코팅된 열교환기

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005300110A (ja) * 2004-04-15 2005-10-27 Daikin Ind Ltd 空気調和機の室内機
JP2008164238A (ja) * 2006-12-28 2008-07-17 Sumitomo Light Metal Ind Ltd 熱交換器用アルミニウムフィン材及びそれを用いた熱交換器
KR101146899B1 (ko) * 2010-05-24 2012-05-15 인하대학교 산학협력단 산화티탄 및 금속텅스텐산화물 접합구조의 광촉매제 및 이의 제조방법
JP2017512294A (ja) * 2014-02-26 2017-05-18 エルジー エレクトロニクス インコーポレイティド 可視光線用光触媒装置が備えられる家電製品
KR101973990B1 (ko) * 2018-01-16 2019-04-30 주식회사 임금님명품침대가구 게르마늄이 함유된 브래지어용 패드의 제조방법 및 이에 의해 제조된 브래지어용 패드
JP2020032405A (ja) * 2018-08-27 2020-03-05 シャープ株式会社 光触媒組成物
KR102307194B1 (ko) * 2019-12-23 2021-09-30 주식회사 유웰 가시광 영역에서 작용하는 광촉매 필터를 이용한 차량용 공기 청정기

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