KR102394149B1 - High performance photocatalytic sterilizatio device - Google Patents

Abstract

The present invention provides a high functional photocatalytic sterilization apparatus, in which the area of a photochemical reaction is increased to generate more radicals and the volume of ultraviolet lamps is reduced to improve radical discharge efficiency, the photocatalytic coating composition has excellent toxic gas decomposition performance and coating durability, and the sterilization efficiency through partial recirculation of a photocatalytic product is increased. The apparatus includes: a housing comprising a housing main body having a sterilization module storage room, a housing lower cover which is provided on the lower part of the housing main body in an openable and closable manner and has an air suction port, and a housing upper cover which is provided on the upper part of the housing main body in an openable and closable manner and has a first air discharge port; a high-function photocatalytic sterilization module; a blower which sucks outside air and injects the outside air into the sterilization duct; and an air filter which is provided on the air suction port side and removes fine dust and pollutants in the air.

Description

High performance photocatalytic sterilization device

The present invention relates to a sterilization device that purifies and sterilizes air through a photocatalytic reaction. In particular, more radicals can be generated due to an increase in the area of a photochemical reaction, and the volume of the UV lamp becomes smaller and airflow obstruction is reduced, thereby discharging radicals. It relates to a high-function photocatalyst sterilizer that increases efficiency, has excellent decomposition performance of harmful gases and coating durability of the photocatalyst coating composition, and improves sterilization and decomposition efficiency by partially recirculating photocatalyst product materials.

Photocatalytic reaction is being put to practical use in various fields such as home appliances, roads, vehicles, air treatment, medical treatment, and water quality treatment. For example, various volatile organic compounds, formaldehyde, etc., which are commonly referred to as sick house syndrome and old house syndrome, are decomposed and removed using photocatalytic reaction. As such, photocatalytic reaction is one of the representative future technologies that are in the spotlight in terms of energy and environment. Accordingly, it is currently being actively used in the energy and environmental fields. It is being actively used to decompose and remove harmful organic matter and air pollutants because it can easily remove pollutants spread all over the earth with only light without much energy. For example, a photocatalytic purification device is used for the purpose of purifying and sterilizing indoor air.

As the background technology of the present invention, as Korean Patent Registration No. 10-0874130, a 'purifying device using a photocatalyst' is proposed. It is configured to be connected in series or in parallel by installing each UV lamp and ozone (O3) lamp in an independent tube, independent of each wavelength, and the inner end of the spiral photocatalyst plate into which each lamp is inserted is wrinkled to form air Alternatively, the contact area with water is further increased, and at the same time, wrinkles are formed at the end contacting the lamp to increase the contact area with the lamp to prevent damage to the lamp. However, the background art has a problem in that the sterilization power is lowered by the spiral photocatalyst plate causing an airflow obstruction and lowering the exhaust efficiency of the fan.

Korean Patent Registration No. 10-0874130

The present invention enables the generation of more radicals by increasing the area of the photochemical reaction, the emission efficiency of radicals increases by reducing the volume of the ultraviolet lamp and the blow obstruction, and the excellent decomposition performance of the photocatalyst coating composition and the coating durability It is an object of the present invention to provide a high-functional photocatalyst sterilization device capable of increasing the sterilization and decomposition efficiency by partially recirculating the photocatalyst product.

A high-function photocatalytic sterilization device according to a preferred embodiment of the present invention,

A housing main body having a sterilization module storage room, a housing lower cover installed openly and openably on the lower part of the housing main body and having an air inlet in one place of the housing main body, and openably and openably installed on the upper part of the housing main body and opening and closing the first air a housing comprising a housing upper cover having an outlet;

a high-function photocatalytic sterilization module having a sterilization duct that causes a reaction between LED ultraviolet rays and a photocatalytic material to kill organic substances such as bacteria and viruses, and is inserted into the housing and fixedly installed;

a blower for generating a blowing force, sucking outside air from an air intake port, and injecting it into the sterilization duct;

An air filter installed on the side of the air intake to remove fine dust and contaminants in the air; including,

The high-function photocatalyst sterilization module is

A photocatalytic sterilization chamber that has a trapezoidal cross section by a front plate and a rear plate that are parallel to each other at regular intervals and is connected to the front plate and the rear plate and is inclined at a predetermined angle, and is closed inside by these front and rear plates and the inclined plate a sterilization duct having a photocatalyst material coated on all inner surfaces of the photocatalyst sterilization chamber, including a sterilization duct having a blower inlet formed at a lower portion of the photocatalytic sterilization chamber; at least one photocatalyst channel holder disposed on the inner wall of the sterilization duct; a photocatalyst channel detachably fitted to the photocatalyst channel holder and having catalyst expansion wings radially formed on the inner surface of the tunnel-type photocatalytic reaction chamber and the photocatalytic reaction chamber and coated with a photocatalytic coating composition on the inner and outer surfaces; and an ultraviolet lamp disposed inside the photocatalytic channel and irradiating ultraviolet light with the photocatalyst coating composition to cause a photocatalytic reaction.

In addition, the housing body has a predetermined radius of curvature on both left and right sides to form a circular column shape, and an air filter holder for mounting an air filter is further installed on the inner surface of the housing lower cover, and the air filter holder has one side of the air filter holder. It is characterized in that the air filter replacement opening for replacing the filter is formed.

In addition, the LED strip installation rod having a circular cross section over a certain length on the outside of the photocatalyst channel and coated with titanium dioxide (TiO ₂ ) on the outer peripheral surface of the LED strip installation rod It consists of an LED strip that generates LED ultraviolet rays It is characterized in that one or more LED ultraviolet emitters disposed in the photocatalytic sterilization room are further installed.

In addition, for internal cleaning and management of the sterilization duct, an opening for duct management is formed on the front plate of the sterilization duct, and a photocatalyst front scattering plate base equipped with a photocatalyst front scattering plate is detachably installed in the duct management opening. characterized.

In addition, by bending steel plates on both swash plates and front plates of the sterilization duct, umbels having an angle of 60 degrees each have a certain width and are continuously connected to form wrinkles, so that the photocatalyst coating composition is coated to induce scattering and diffusion of ultraviolet rays. An inclined scattering plate and a photocatalyst front scattering plate are installed respectively, and for photocatalyst scattering and diffusion, the ridge of the photocatalyst inclined scattering plate is disposed in a direction perpendicular to that of the photocatalyst front scattering plate, and the longitudinal direction of the ridge of the photocatalyst front scattering plate is air It is characterized in that it is arranged to coincide with the blowing direction in order to minimize the resistance of the flow.

In addition, in order to increase the sterilization and decomposition efficiency by partially recirculating the photocatalyst product, a photocatalyst recirculation outlet is further formed at the upper portion of the sterilization duct, and between the housing and the sterilization duct, the photocatalyst recirculation outlet and the air inlet of the blower are in communication It is characterized in that a photocatalyst recirculation passage is provided.

In addition, the photocatalyst coating composition includes 10 to 30 parts by weight of an ultraviolet curable acrylic resin, 1 to 10 parts by weight of a silane coupling agent, and 0.1 to 5 parts by weight of a photoinitiator, based on 100 parts by weight of the photocatalyst sol, a titanium precursor, an acid catalyst , 100 parts by weight of a titanium dioxide photocatalyst prepared by mixing an alcoholic solvent and distilled water, 10 to 30 parts by weight of molybdenum disulfide nanowire, and 1 to 10 parts by weight of cerium aluminide, lupeol and an alkalizing agent in an alcohol-based dispersion solvent It is characterized in that it is prepared by mixing.

The photocatalytic sol is prepared by stirring and heating 100 parts by weight of a titanium precursor, 18 to 25 parts by weight of an acid catalyst, 25 to 35 parts by weight of an alcoholic solvent, and 250 to 350 parts by weight of distilled water to prepare a titanium dioxide photocatalyst; And 100 parts by weight of titanium dioxide photocatalyst, 10 to 30 parts by weight of molybdenum disulfide nanowire, and 1 to 10 parts by weight of cerium aluminide, mixed with an alcoholic dispersion solvent containing lupeol and an alkalizing agent, the solid content is 5 to 30% by weight and adjusting the pH to be 4.0 to 7.0.

In addition, the molybdenum disulfide nanowire is supersaturated by sonication and stirring of a precursor solution of molybdenum disulfide at 70 to 90° C. for 30 minutes to 2 hours, followed by cooling to precipitate a powdery molybdenum disulfide intermediate material. to do; and heat-treating the intermediate material; The cerium aluminide is at least one powder selected from sodium hydride (NaH) and lithium hydride (LiH), cerium chloride (CeCl ₃ ) powder and aluminum chloride (AlCl ₃ ) powder and 5 to 20: 1: 1 to 5 molar ratio mixing to form a mixed powder; generating a composite powder containing cerium aluminide by putting the mixed powder together with a ball into a reaction vessel, filling argon, helium or nitrogen gas, and then performing ball milling; and dispersing the resulting composite powder in distilled water, and then filtering to recover the cerium aluminide powder.

According to the high-function photocatalytic sterilization device of the present invention, the photocatalyst coating composition is coated on the entire inner and outer surfaces of the inner and outer surfaces of the inner and outer surfaces of the sterilization duct and the photocatalyst channel to maximize the sterilization effect of air containing various bacteria and viruses such as COVID-19. there is an effect In addition, a photocatalyst recirculation path is provided between the housing and the sterilization duct to increase sterilization efficiency. In addition, the LED strip installed on the LED UV emitter uses a UV LED of 200 to 300 nm to increase the replacement cycle and lifespan. In addition, by applying the sterilization duct and the photocatalyst scattering plate, the area of photochemical reaction is increased, so more radicals (OH-) can be generated, and the volume of the LED lamp is reduced, so the blowing resistance of the blowing fan is reduced and the emission efficiency of radicals is decreased. It has the advantage of increasing the sterilization power. In addition, the improved photocatalyst coating composition may be coated to have exceptionally excellent decomposition performance of harmful gases and surface durability.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so the present invention is limited to the matters described in the accompanying drawings It should not be construed as being limited.
1 is a perspective view of a high-function photocatalytic sterilization apparatus according to an embodiment of the present invention;
Figure 2 is an exploded perspective view of Figure 1;
3 is an exploded perspective view between a photocatalyst channel holder and a photocatalyst channel applied to the high-function photocatalyst sterilizer of FIG. 1. FIG.
Fig. 4 is a front view of Fig. 1;
Fig. 5 is a cross-sectional view taken along line AA of Fig. 4;
Fig. 6 is a cross-sectional view taken along line BB of Fig. 4;
Fig. 7 is a cross-sectional view taken along line CC of Fig. 4;
8 is a modified example of a high-function photocatalyst sterilization module applied to a high-function photocatalyst sterilization apparatus according to an embodiment of the present invention.
9 is a plan view of the high-function photocatalytic sterilization module shown in FIG. 8;

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto.

The photocatalytic sterilizer 10 according to the present embodiment includes a housing 12 as shown in FIGS. 1 to 5 . The housing 12 includes a housing body 121 having a sterilization module storage chamber 121a, and an air intake port 122a installed at a location of the housing body 121 to be opened and closed at the lower portion of the housing body 121. It consists of a housing lower cover 122 having a housing, and a housing upper cover 123 which is installed to be opened and closed on the upper part of the housing body 121 and has a first air outlet 123a. Here, the housing body 121 has a predetermined radius of curvature R on the left and right sides as shown in FIG. 5 to form a circular column shape. As described above, the housing body 121 has a beautiful appearance as if an arch column is formed by forming a radius of curvature R on both sides of the housing body 121 . In addition, since the housing lower cover 122 and the housing upper cover 123 can be separated by disassembling the screws, a high-function photocatalytic sterilization module 20 to be described later can be easily inserted into the sterilization module storage chamber 121a in the housing 12 to be installed. can

A second air outlet 122b may be additionally installed on the upper front side of the housing body 121 . Therefore, in this embodiment, the purified air is discharged through the first air outlet 123a and the second air outlet 122b.

A plurality of moving wheels 5 may be installed on the lower surface of the housing 12 as shown in FIG. 4 . Therefore, the photocatalytic sterilizer 10 can be easily moved through the housing 12 side moving wheel 5 .

An air filter holder 124 for mounting the air filter 40 is installed on the inner surface of the housing lower cover 122 . The air filter holder 124 has an air filter replacement opening 125 for replacing the air filter 40 on one side as shown in FIG. 2 . Therefore, it is possible to easily install the air filter 40 by simply inserting it into the air filter holder 124 .

A high-function photocatalytic sterilization module 20 is installed inside the housing 12 . The high-function photocatalyst sterilization module 20 has a sterilization duct 210 and generates ultraviolet rays inside it to oxidize hydroxyl radicals (OH-) (hereinafter referred to as 'radicals') generated by a reaction between photocatalytic materials. It decomposes and destroys organic substances such as bacteria and viruses. The high-function photocatalyst sterilization module 20 will be described later.

A blower 30 is provided for sucking the outside air in the room where the photocatalytic sterilization device 10 is disposed and injecting it into the sterilization duct 210 . The blower 30 is mounted in the blowing chamber 217 on the lower side of the sterilization duct 210 as shown in FIGS. 2 and 6 . The blower 30 generates blowing force, sucks in outside air through the air intake port 122a on the housing lower cover 122 side, and injects it into the sterilization duct 210 , and then the upper front surface of the housing upper cover 123 and the housing 12 . It is discharged through the first and second air outlets (123a, 122b) formed in the .

An air filter 40 for removing fine dust and contaminants in the air is installed on the side of the air intake 122a of the housing lower cover 122 . In this embodiment, the air filter 40 is accommodated in a replaceable air filter holder 124 installed on the inner surface of the housing lower cover (122). The air filter 40 may be any one or more of a pre-filter, a HEPA filter, and an ultra-high performance filter (ULPA, Ultra Low Penetration Air filter). As described above, the photocatalytic sterilizer 10 is equipped with an air filter 40, so that fine dust filtration of indoor air is also performed. Of course, in the present invention, the air filter 40 may be replaced with an antibacterial filter or an activated carbon filter or used together with them.

2 to 8, the high-function photocatalyst sterilization module 20 is provided with a sterilization duct 210 that provides a blowing passage and a photocatalytic reaction chamber. The sterilization duct 210 is connected to the front plate 211 and the rear plate 212 and the front plate 211 and the rear plate 212 parallel to each other at regular intervals and is trapezoidal by the inclined plate 213 inclined at a predetermined angle. It has a cross-section and includes a photocatalytic sterilization chamber 214 that is closed inside by these front and rear plates 211 and 212 and swash plate 213, but has a decomposition performance of harmful gases on all inner surfaces of the photocatalytic sterilization chamber 214 And a photocatalyst coating composition having excellent surface durability is coated, and a blower inlet 214a is formed in the lower portion of the photocatalyst sterilization chamber 214 . Accordingly, the intake air introduced through the blower inlet 214a is discharged upward through the photocatalytic sterilization chamber 214 .

Preferably, all inner surfaces of the sterilization duct 210 are coated with a photocatalytic coating composition to be described later in order to increase the photocatalytic reaction area. The sterilization duct 210 is made of a corrosion-resistant stainless steel plate in this embodiment, but is not limited to such a metal material.

For internal cleaning and management of the sterilization duct 210, an opening 211a for duct management is formed on the front plate 211 of the sterilization duct 210 as shown in FIG. The plate base 232 is installed detachably. A photocatalyst front scattering plate 230 may be mounted on the inner surface of the photocatalyst front scattering plate base 232 as shown in FIG. 8 .

One or more photocatalyst channel holders 280 are installed on the inner wall of the sterilization duct 210 . As shown in FIG. 3 , the photocatalyst channel holder 280 is provided with channel coupling grooves 280a facing each other. The photocatalyst channel holder 280 may be installed with a holder support leg 282 as shown in FIG. 9 .

A photocatalyst channel 300 that is detachably fitted to the photocatalyst channel holder 280 is provided. The photocatalytic channel 300 has a tunnel-type photocatalytic reaction chamber 302 and a catalyst extension blade 304 radially formed on the inner surface of the photocatalytic reaction chamber 302, and a photocatalytic coating composition to be described later is coated on the inner and outer surfaces. has

An ultraviolet lamp 310 is disposed inside the photocatalytic channel 300 . The ultraviolet lamp 310 causes a photocatalytic reaction by irradiating ultraviolet rays to the photocatalytic coating composition, and at the same time generates a sterilizing power in the airflow passing through the photocatalyst channel 300 .

On the other hand, as shown in FIGS. 5 and 9 , the LED strip installation rod 241 and the LED strip installation rod 241 having a circular cross section over a certain length on the outside of the photocatalytic channel 300 and coated with titanium dioxide (TiO ₂ ) One or more LED ultraviolet emitters 240 disposed in a photocatalyst sterilization chamber 214 may be further installed, which are circularly disposed on the outer circumferential surface of the LED strip 242 to generate LED ultraviolet rays.

In addition, as shown in FIGS. 8 and 9 , the slopes 213 and the front plate 211 of the sterilization duct 210 are bent to form umbels 220a and 230a each having an angle of 60 degrees each having a predetermined width and successively. A photocatalyst inclined scattering plate 220 and a photocatalyst front scattering plate 230 are installed respectively to form a wrinkle shape and are coated with a photocatalyst coating composition to induce scattering and diffusion of ultraviolet rays. The mountain shape 220a of 220 is disposed in a direction perpendicular to the mountain shape 230a of the photocatalytic front scattering plate 230 and the longitudinal direction of the mountain shape 230a of the photocatalytic front scattering plate 230 minimizes the resistance of air flow. It can be arranged to coincide with the blowing direction (X) in order to do so.

Here, the photocatalyst coating composition includes 10 to 30 parts by weight of an ultraviolet curable acrylic resin, 1 to 10 parts by weight of a silane coupling agent, and 0.1 to 5 parts by weight of a photoinitiator, based on 100 parts by weight of the photocatalyst sol, a titanium precursor, an acid catalyst , 100 parts by weight of a titanium dioxide photocatalyst prepared by mixing an alcoholic solvent and distilled water, 10 to 30 parts by weight of molybdenum disulfide nanowires, and 1 to 10 parts by weight of cerium aluminide, lupeol and an alkalizing agent.

The photocatalyst sol is prepared by stirring and heating 100 parts by weight of a titanium precursor, 18 to 25 parts by weight of an acid catalyst, 25 to 35 parts by weight of an alcoholic solvent, and 250 to 350 parts by weight of distilled water to prepare a titanium dioxide photocatalyst; And 100 parts by weight of titanium dioxide photocatalyst, 10 to 30 parts by weight of molybdenum disulfide nanowire, and 1 to 10 parts by weight of cerium aluminide, mixed with an alcoholic dispersion solvent containing lupeol and an alkalizing agent, the solid content is 5 to 30% by weight and adjusting the pH to be 4.0 to 7.0; may be prepared including.

In addition, molybdenum disulfide nanowires are supersaturated by sonication and stirring of a precursor solution of molybdenum disulfide at 70 to 90 ° C. for 30 minutes to 2 hours, followed by cooling to precipitate a powdery molybdenum disulfide intermediate material. step; and heat-treating the intermediate material; The cerium aluminide is at least one powder selected from sodium hydride (NaH) and lithium hydride (LiH), cerium chloride (CeCl ₃ ) powder and aluminum chloride (AlCl ₃ ) powder and 5 to 20: 1: 1 to 5 molar ratio mixing to form a mixed powder; generating a composite powder containing cerium aluminide by putting the mixed powder together with a ball into a reaction vessel, filling argon, helium or nitrogen gas, and then performing ball milling; And after dispersing the resulting composite powder in distilled water, it may be prepared by a method comprising the step of recovering the cerium aluminide powder by filtration.

<Production Example 1>

Preparation of photocatalytic sol

TiCl ₄ and Ti(OCH ₂ CH ₃ ) ₄ 100 parts by weight of a titanium precursor mixed in a 2: 1 weight ratio, 22 parts by weight of a nitric acid catalyst, 30 parts by weight of ethanol and 280 parts by weight of distilled water were stirred at a temperature of 100° C. for 14 hours. and heating to prepare a titanium dioxide photocatalyst having a crystalline phase of an anatase type and a solid content of 17% by weight.

100 parts by weight of the titanium dioxide photocatalyst prepared above, 13 parts by weight of molybdenum disulfide nanowire and 5 parts by weight of cerium aluminide, lupeol and an alkalizing agent (diisopropylethylamine and sodium hydroxide are mixed in a 1: 0.2 weight ratio) was mixed with ethanol to have a solid content of 19 wt%, and the pH was adjusted to 6.5 to prepare a photocatalyst sol (Sol).

At this time, the molybdenum disulfide nanowire (NH ₄ ) ₂ MoS ₄ precursor solution of molybdenum disulfide in which 0.2 g of the precursor is mixed with 50 ml of a tertiary polar or non-polar solvent is ultrasonicated at 80 ° C. for 1 hour and stirred (sonication) and stirring ( stirring) to supersaturate, and then cooled to precipitate an intermediate molybdenum disulfide in powder form; After performing the first heat treatment at 500 °C while injecting the intermediate material with Ar, H ₂ , and H ₂ S at 100, 7, and 5 sccm, respectively; Ar and H ₂ S was injected at 100 and 8 sccm, respectively, and was formed by a manufacturing method including performing secondary heat treatment at 1200 ° C., and an average length of 42 nm was used.

In addition, the cerium aluminide is obtained by mixing lithium hydride (LiH) powder with cerium chloride (CeCl ₃ ) powder and aluminum chloride (AlCl ₃ ) powder in a molar ratio of 18: 1: 3 to form a mixed powder; The mixed powder was charged together with 17 9.5 mm diameter balls made of chrome steel in a 125 ml container made of tool steel in a weight ratio of about 1:28, and then filled with argon (Ar) in the container, Composite powder containing cerium aluminide was produced by performing high energy ball milling for 4 hours using a mill. after; The resulting composite powder was dispersed in distilled water to remove salt by-products such as sodium chloride, and then filtered to recover cerium aluminide (CeAl ₄ ) powder having an average particle diameter of about 345 nm.

In addition, the lupeol is dried and then pulverized lupine seeds and pods of lupine seeds to obtain lupine seed powder and pod powders of lupine seeds; And 95% or more of ethanol as an extraction solvent to the lupine seed powder and the pod powder of the lupine seed was added in a weight ratio of 1: 7 and heated to 65° C. to extract the lupeol was used. At this time, the lupeol was mixed to be contained in an amount of 7 parts by weight in 100 parts by weight of ethanol.

<Comparative Preparation Example 1>

Preparation of comparative photocatalytic sol

Ti(OCH ₂ CH ₃ ) ₄ 100 parts by weight of a titanium precursor, 15 parts by weight of a nitric acid catalyst, 30 parts by weight of ethanol, and 280 parts by weight of distilled water were stirred and heated at a temperature of 90° C. for 11 hours, so that the crystal phase was anatase type and the solid content was 12 A weight % titanium dioxide photocatalyst was prepared.

100 parts by weight of the titanium dioxide photocatalyst prepared above was mixed with ethanol containing an alkalizing agent (sodium hydroxide), the solid content was 9% by weight, and the pH was adjusted to 6.5, thereby preparing a photocatalyst sol (Sol).

<Example 1>

Preparation of photocatalyst coating composition for sterilization device using LED lamp ultraviolet rays

Based on 100 parts by weight of the photocatalytic sol prepared in Preparation Example 1; 20 parts by weight of UV-curable acrylic resin; 3 parts by weight of a silane coupling agent obtained by mixing vinyltrichlorosilane and 3-(2-aminoethylaminopropyl)dimethoxymethylsilane in a 1:1 weight ratio; And 0.8 parts by weight of a photoinitiator (2-hydroxy 2-methyl-1-phenylpropan-1-one) was mixed to prepare a photocatalyst coating composition for a sterilizer using LED lamp ultraviolet rays.

In this case, the ultraviolet curable acrylic resin is isobornyl (meth)acrylate 19% by weight, tetrahydrofurfuryl acrylate 26% by weight, tripropylene glycol diacrylate 31% by weight, 1,6-hexanediol diacrylate 9% by weight % and 15 wt% of pentaerythritol triacrylate was used.

<Comparative Example 1>

Preparation of Comparative Coating Compositions

With respect to 100 parts by weight of the photocatalytic sol prepared in Comparative Preparation Example 1; 20 parts by weight of UV-curable acrylic resin; 3 parts by weight of 3-(2-aminoethylaminopropyl)dimethoxymethylsilane; And 0.8 parts by weight of a photoinitiator (2-hydroxy 2-methyl-1-phenylpropan-1-one) was mixed to prepare a photocatalyst coating composition for a sterilizer using LED lamp ultraviolet rays.

In this case, the UV-curable acrylic resin was used containing 65 wt% of isobornyl (meth)acrylate and 35 wt% of tripropylene glycol diacrylate.

<Test Example>

8, the photocatalytic coating composition for a sterilizer using the LED lamp ultraviolet light prepared in Example 1 and the comparative coating composition prepared in Comparative Example 1 are sprayed on a scattering plate made of stainless steel with a curved surface as shown in FIG. 8, respectively. By coating, irradiating with UV (300 to 2,000 mJ) and curing, a scattering plate having a photocatalyst coating composition coated on the surface was prepared.

Harmful gas decomposition performance

The harmful gas decomposition performance was evaluated for the scattering plates each coated with the photocatalyst coating composition for a sterilizer using the LED lamp ultraviolet light prepared in Example 1 and the comparative coating composition prepared in Comparative Example 1. The results are shown in Table 1 below.

The evaluation was measured by a small chamber test method (ISO 18560-1:2014), the injection gas concentration was 0.1 ppm, and the light source used was an LED lamp emitting ultraviolet rays of 200 to 400 nm wavelength.

Coating surface durability evaluation

For the scattering plates each coated with the photocatalyst coating composition for a sterilization device using the LED lamp ultraviolet light prepared in Example 1 and the comparative coating composition prepared in Comparative Example 1, a cellophane tape having a width of 5 cm and a length of 15 cm was adhered to the surface. Then, the mass of the composition to be peeled off was measured. At this time, when the mass of the peeled composition is 3% by weight or less relative to the mass of the initially coated composition, it is good, and when it exceeds 3% by weight, it is insufficient, and the results are shown in Table 1 below.

Degree of decomposition of harmful gases surface durability Example 1 99% Good Comparative Example 1 77% Inadequate

As can be seen in Table 1, when the photocatalyst coating composition for a sterilizer using the LED lamp ultraviolet light prepared in Example 1 was coated, compared with the case in which the comparative coating composition prepared in Comparative Example 1 was coated, It was confirmed that it has an exceptionally excellent decomposition performance of harmful gases and surface durability. Unexplained code '217' is a 'blower mounting part'.

On the other hand, in order to increase the efficiency of sterilization and decomposition by recirculation of a part of the photocatalyst product, a photocatalyst recirculation outlet 215 is further formed on the upper portion of the sterilization duct 210 as shown in FIG. 7 , and the housing 12 and the sterilization duct 210 . Between the photocatalyst recirculation outlet 215 and the blower inlet 301 of the blower 30, a photocatalyst recirculation passage 13 communicating with the photocatalyst recirculation passage 13 may be provided.

The operation of the photocatalytic sterilizer configured in this way will be described.

First, when the operation button 129 disposed on the front upper part of the housing 12 is turned on, the blower 30 is driven to start blowing, and at the same time, the photocatalyst channel 300 is irradiated with ultraviolet light from the ultraviolet lamp 310 . A photocatalytic reaction takes place inside the At this time, when the blowing force is generated through the blowing inlet 214a, the blowing flow is generated inside the sterilization duct 210. At this time, the outside air (contaminants, bacteria, viruses, etc.) is sucked through the blower inlet 214a.

In addition, ultraviolet rays generated from the LED strip 242 of the LED ultraviolet emitter 240 are radiated and collide with the inner surface of the sterilization duct 210, so that electrons are formed from the coated titanium dioxide to generate strong oxidizing power, and hydroxyl radicals (-OH) and superoxide (-O2) are formed. In this process, more radicals (OH-) are generated due to the increase in the area of the photochemical reaction by the titanium dioxide coated on the inner surface of the sterilization duct 210, the photocatalyst inclined scattering plate 220 and the photocatalyst front scattering plate 230. . Therefore, oxidation, decomposition, and death of organic compounds such as pollutants, bacteria and viruses included in the outdoor air introduced into the sterilization duct 210 are promoted by the increased sterilization power.

Therefore, dust contained in the outside air through the air intake port 122a of the housing cover 122 is primarily filtered through the air filter 40, and then organic materials such as bacteria and viruses are decomposed and killed by oxidation power. Accordingly, the air from which dust is removed and organic substances such as viruses are decomposed and purified is discharged through the first air outlet 123a and the second air outlet 122b.

In this process, more radicals (OH-) are generated due to the increase in the area of the photochemical reaction by the titanium dioxide coated on the inner surface of the sterilization duct 210, the photocatalyst inclined scattering plate 220 and the photocatalyst front scattering plate 230. .

In addition, since the volume of the LED ultraviolet emitter 240 is small, the blower 30 reduces the blown obstruction, and the emission efficiency of radicals (OH-) is increased, so that the sterilization power is increased.

In addition, the present invention uses an LED-type photocatalyst, and the replacement cycle of the LED strip 242 is longer, and thus has an advantage in that the lifespan of the LED strip 242 is increased several times longer than that of the conventional screw-type or filter-type photocatalyst.

In addition, there is an effect of maximizing the sterilization effect of air containing various bacteria and viruses such as COVID-19 by using the ultraviolet light of the LED lamp having a wavelength of 200 to 400 nm, which is a wavelength band with strong bacterial sterilization power.

In addition, in the present invention, the photocatalyst coating composition has an effect of being easily coated with excellent adhesion. Accordingly, even when the member to be coated has a curved surface, the photocatalytic coating composition of the present invention can be easily coated with excellent adhesion, further maximizing the efficiency of the photocatalytic reaction, and has excellent decomposition performance of harmful gases and surface durability.

So far, the present invention has been described in detail with reference to the presented embodiment, but those skilled in the art can make various modifications and variations of the invention without departing from the technical spirit of the present invention with reference to the presented embodiment. will be. The present invention is not limited by such variations and modifications, but only by the claims appended hereto.

10: photocatalyst sterilizer
12: housing
121: housing body
122: housing lower cover
123: housing top cover
20: high-function photocatalyst sterilization module
210: sterilization duct
220: photocatalyst inclined scattering plate
230: photocatalyst front scattering plate
240: LED ultraviolet emitter
280: photocatalyst channel holder
300: photocatalyst channel
30: blower
40: air filter

Claims (9)

A housing main body 121 having a sterilization module storage chamber 121a, and a housing lower cover installed in a lower portion of the housing main body 121 so as to be able to open and close and having an air intake port 122a in one place of the housing main body 121 ( a housing 12 comprising: 122) and a housing upper cover 123 that is openly and openably installed on the upper portion of the housing body 121 and has a first air outlet 123a;
A high-function photocatalytic sterilization module 20 having a sterilization duct 210 that causes a reaction between LED ultraviolet rays and a photocatalytic material to kill organic substances such as bacteria and viruses, and is inserted into the housing 12 and fixedly installed;
a blower (30) for generating blowing force to suck in outside air from the air inlet and injecting it into the sterilization duct (210);
The air filter 40 is installed on the side of the air intake to remove fine dust and contaminants in the air; including,
The high-function photocatalyst sterilization module 20 is
It has a trapezoidal cross-section by the front plate 211 and the rear plate 212 and the front plate 211 and the rear plate 212, which are parallel to each other at regular intervals, and the inclined plate 213 inclined at a predetermined angle, and these front surfaces A photocatalyst coating composition is coated on all inner surfaces of the photocatalyst sterilization chamber 214, including the photocatalyst sterilization chamber 214 closed inside by the plate 211, the rear plate 212, and the inclined plate 213, and the photocatalytic sterilization a sterilization duct 210 having a blower inlet 214a formed as a lower portion of the seal 214; at least one photocatalyst channel holder 280 disposed on the inner wall of the sterilization duct 210; It is detachably fitted to the photocatalyst channel holder 280 and has a tunnel-type photocatalytic reaction chamber 302 and a catalyst expansion blade 304 radially formed on the inner surface of the photocatalytic reaction chamber 302, and photocatalyst on the inner and outer surfaces a photocatalytic channel 300 coated with a coating composition; and an ultraviolet lamp (310) disposed inside the photocatalyst channel (300) and causing a photocatalytic reaction by irradiating ultraviolet rays with the photocatalyst coating composition. The method of claim 1,
The housing body 121 has a predetermined radius of curvature R on both sides of the housing body 121 to form a circular column shape, and an air filter holder 124 for mounting the air filter 40 on the inner surface of the housing lower cover 122 . ) is further installed, and an air filter replacement opening 125 for replacing the air filter 40 is formed on one side of the air filter holder 124 . The method of claim 1,
LED strip installation rod 241 having a circular cross section over a certain length on the outside of the photocatalyst channel 300 and coated with titanium dioxide (TiO ₂ ) on the outer circumferential surface of the LED strip installation rod 241, LED ultraviolet rays A high-function photocatalytic sterilization device, characterized in that one or more LED ultraviolet emitters 240 are further installed in the photocatalytic sterilization chamber 214 made of an LED strip 242 for generating a. The method of claim 1,
For internal cleaning and management of the sterilization duct 210, an opening 211a for duct management is formed on the front plate 211 of the sterilization duct 210, and a photocatalyst front scattering plate 230 in the opening 211a for duct management. A high-function photocatalyst sterilizer, characterized in that the mounted photocatalyst front scattering plate base 232 is detachably installed. The method of claim 1,
On both sides of the inclined plates 213 and the front plate 211 of the sterilization duct 210, the ridges 220a and 230a each having an angle of 60 degrees by bending the steel plate have a certain width and are continuously connected to form a wrinkled photocatalyst coating composition A photocatalyst inclined scattering plate 220 and a photocatalyst front scattering plate 230 that are coated to induce scattering and diffusion of ultraviolet rays are installed, respectively, for photocatalyst scattering and diffusion. is disposed in a direction perpendicular to the ridge 230a of the photocatalyst front scattering plate 230 and the longitudinal direction of the ridge 230a of the photocatalyst front scattering plate 230 in the blowing direction (X) and A high-function photocatalytic sterilizer, characterized in that it is arranged to match. The method of claim 1,
In order to increase the sterilization and decomposition efficiency by partially recirculating the photocatalyst product, a photocatalyst recirculation outlet 215 is further formed on the upper portion of the sterilization duct 210, and between the housing 12 and the sterilization duct 210, photocatalyst recirculation A high-function photocatalyst sterilization device, characterized in that it is provided with a photocatalyst recirculation passage (13) that communicates with the outlet (215) and the blower inlet (301) of the blower (30). The method of claim 1,
The photocatalyst coating composition includes 10 to 30 parts by weight of an ultraviolet curable acrylic resin, 1 to 10 parts by weight of a silane coupling agent, and 0.1 to 5 parts by weight of a photoinitiator, based on 100 parts by weight of the photocatalyst sol, a titanium precursor, an acid catalyst, alcohol 100 parts by weight of a titanium dioxide photocatalyst prepared by mixing a solvent and distilled water, 10 to 30 parts by weight of molybdenum disulfide nanowire, and 1 to 10 parts by weight of cerium aluminide, lupeol and an alkalizing agent by mixing in an alcohol-based dispersion solvent A high-function photocatalytic sterilization device, characterized in that it was manufactured. 8. The method of claim 7,
The photocatalytic sol is
preparing a titanium dioxide photocatalyst by stirring and heating 100 parts by weight of a titanium precursor, 18 to 25 parts by weight of an acid catalyst, 25 to 35 parts by weight of an alcoholic solvent, and 250 to 350 parts by weight of distilled water; and
100 parts by weight of a titanium dioxide photocatalyst, 10 to 30 parts by weight of molybdenum disulfide nanowire, and 1 to 10 parts by weight of cerium aluminide, mixed with an alcoholic dispersion solvent containing lupeol and an alkalizing agent, the solid content is 5 to 30% by weight , adjusting the pH to be 4.0 to 7.0; 8. The method of claim 7,
The molybdenum disulfide nanowire is
The precursor solution of molybdenum disulfide is supersaturated by sonication and stirring at 70 to 90° C. for 30 minutes to 2 hours, followed by cooling to precipitate an intermediate molybdenum disulfide in powder form; and heat-treating the intermediate material;
The cerium aluminide is
At least one powder selected from sodium hydride (NaH) and lithium hydride (LiH) is mixed with cerium chloride (CeCl ₃ ) powder and aluminum chloride (AlCl ₃ ) powder in a molar ratio of 5 to 20: 1: 1 to 5 and mixed powder forming a; generating a composite powder containing cerium aluminide by putting the mixed powder together with a ball into a reaction vessel, filling argon, helium or nitrogen gas, and then performing ball milling; and dispersing the resulting composite powder in distilled water and then filtering to recover the cerium aluminide powder.

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