KR102633174B1 - Air filter and air purifier - Google Patents

Abstract

The present invention relates to a breathable substrate; and an antibacterial coating layer containing a urethane acrylate-based oligomer or polymer and a photosensitizer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1 to 10. An air filter comprising a and an air purifier equipped with the air filter. will be.

Description

Air filter and air purifier

The present invention relates to air filters and air purifiers.

A photosensitizer absorbs light and generates reactive oxygen species (ROS). By irradiating light of a specific wavelength from the outside, reactive oxygen species or free radicals are generated from the photosensitizer, causing various lesions or cancerous cells. Photodynamic therapy (PDT), which destroys by inducing death, is widely used.

There are various attempts to develop polymer materials with antibacterial properties using this photodynamic reaction. For example, in Korea Patent No. 10-1465964, a silicone resin is melted, and then the melted resin and light sensitivity are used. A method of mixing agents or a method of using a coating solution formed by dissolving a silicone resin and a photosensitizer in a solvent has been disclosed.

However, according to a method of melting a silicone resin and mixing it with a photosensitizer, the photosensitizer may not be distributed homogeneously and may aggregate within the silicone resin because the dispersibility between the photosensitizer and the silicone resin is low. In addition, when melting with a silicone resin, it is impossible to control the thickness of the silicon after melting, so it is not easy to produce the product according to the field or use to which it is applied, or there is a limitation in that it is not suitable for mass production.

It is known that when using a coating solution formed by dissolving a silicone resin and a photosensitizer in a solvent, a certain level of antibacterial property can be achieved without significant restrictions on the field of application. However, when light in the visible light range is used, sufficient antibacterial property is expressed. It is not easy to produce active oxygen sufficiently, and the generated active oxygen exists only for a very short period of time, so there is a limitation in that excessive light energy must be irradiated for a relatively long period of time.

Korean Patent No. 10-1465964 [Registration date: November 21, 2014]

The present invention is intended to provide an antibacterial air filter that can maintain high antibacterial properties for a long time and achieve high antibacterial efficiency even when using light in the visible light range.

Additionally, the present invention is to provide an air purifier equipped with the antibacterial air filter.

In this specification, a breathable substrate; and an antibacterial coating layer containing a urethane acrylate-based oligomer or polymer and a photosensitizer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1 to 10. An air filter is provided, including a.

Additionally, in this specification, an air purifier including the air filter may be provided.

Hereinafter, an air filter and air purifier according to specific embodiments of the invention will be described in more detail.

In this specification, (meth)acrylate is meant to include both acrylate and methacrylate.

According to one embodiment of the invention, a breathable substrate; And an antibacterial coating layer containing a urethane acrylate-based oligomer or polymer and a photosensitizer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1 to 10. An air filter comprising a.

The present inventors conducted research on materials with functionality such as antibacterial properties using a photosensitizer, and developed a urethane acrylate-based oligomer or polymer having a molar ratio of urethane functional groups to the (meth)acrylate-based functional groups of 1 to 10. Photocurable coatings manufactured by mixing photosensitizers can be easily applied to various fields and are suitable for mass production. In addition, when manufacturing actual coating films or coated molded products, they can achieve high antibacterial properties even when light in the visible light range is applied. In particular, the invention was completed after confirming through experiments that the generated active oxygen remains longer than previously known antibacterial materials, enabling high antibacterial efficiency.

More specifically, as the molar ratio of the urethane functional group to the (meth)acrylate functional group in the urethane acrylate-based oligomer or polymer is limited to 1 to 10, or 4 to 8, a predetermined polymer structure is formed inside the antibacterial coating layer. can be formed. Accordingly, the antibacterial coating layer may have a specific air permeability, for example, an oxygen permeability of 5 to 100 cc/m2 day, or 20 to 90 cc/m2 day, or 25 to 80 cc/m2 day.

When light in the visible light range is irradiated to the antibacterial coating layer, active oxygen species or free radicals are generated from the photosensitizer contained in the antibacterial coating layer. As described above, as the antibacterial coating layer has an oxygen permeability in the above-described range, , active oxygen can be generated more efficiently, and the remaining time of active oxygen can be greatly increased.

If the molar ratio of the urethane functional group to the (meth)acrylate functional group in the urethane acrylate-based oligomer or polymer is too small, the oxygen permeability of the antibacterial coating layer is significantly lowered, and active oxygen is not sufficiently generated when visible light is irradiated. , it may be difficult to apply it to various applications because it does not have antibacterial properties.

In addition, if the molar ratio of the urethane functional group to the (meth)acrylate functional group in the urethane acrylate-based oligomer or polymer is too large, active oxygen may be generated at a certain level when irradiated with visible light, but the strength of the film of the antibacterial coating layer is lowered and it is not supported. A trace amount of the photosensitizer may leak out of the film, and secondary side reactions to the leaked photosensitizer (e.g., harmful effects on the human body and environmental pollution due to the photosensitizer) may occur, and the antibacterial properties may also occur. The hardness of the coating layer is low, making it difficult to apply to various applications.

The urethane acrylate-based oligomer or polymer may have a predetermined molecular weight in consideration of the specific use or physical properties of the antibacterial coating layer. For example, the urethane acrylate-based oligomer or polymer may have a molecular weight of 200 g/mol to 50,000 g/mol. It may have a weight average molecular weight of . In this specification, the weight average molecular weight means the weight average molecular weight in terms of polystyrene measured by GPC method.

As described above, when light in the visible light region is irradiated to the antibacterial coating layer, the photosensitizer may reflect the light to generate active oxygen, etc., and for this purpose, the antibacterial coating layer may include a photosensitizer in a predetermined amount. there is. Specifically, the antibacterial coating layer may include 0.01 to 5 parts by weight of the photosensitizer based on 100 parts by weight of the urethane acrylate-based oligomer or polymer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1 to 10.

Meanwhile, widely known compounds can be used as the photosensitizer, for example, porphine compounds, porphyrin compounds, chlorins compounds, bacteriochlorins compounds, and phthalocyanine. Phthalocyanine compounds, naphthalocyanine compounds, 5-aminoevuline esters, or two or more of these compounds can be used.

However, in order to achieve higher antibacterial and antibacterial retention performance in the antibacterial coating layer, it is preferable to use a porphine-based compound or a porphyrin-based compound, and more preferably, the photosensitizer is 5,10. ,15,20-tetrakis(4-methoxyphenyl)-porphine compounds or porphyrin compounds into which 1 to 8 phenyl groups with 1 to 10 carbon atoms are introduced, such as porphine, can be used.

Meanwhile, the antibacterial polymer coating composition forming the antibacterial coating layer may include a photoinitiator in a predetermined amount. Specifically, the antibacterial polymer coating composition may contain 0.001 to 10 parts by weight of the photoinitiator relative to 100 parts by weight of the urethane acrylate-based oligomer or polymer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1 to 10.

Specific examples of the photoinitiator are not limited, and commonly known photoinitiators can be used without major limitations. Specific examples of the photoinitiator include benzophenone-based compounds, acetophenone-based compounds, biimidazole-based compounds, triazine-based compounds, oxime-based compounds, or mixtures of two or more types thereof.

The antibacterial polymer coating composition may further include an organic solvent or surfactant. The organic solvent may be added at the time of mixing each component included in the antibacterial polymer coating composition, or may be included in the antibacterial polymer coating composition while each component is added in a dispersed or mixed state in the organic solvent. For example, the antibacterial polymer coating composition may include an organic solvent such that the total solid concentration of the components included is 1% to 80% by weight, or 2 to 50% by weight.

Non-limiting examples of the organic solvent include ketones, alcohols, acetates, and ethers, or mixtures of two or more thereof. Specific examples of such organic solvents include ketones such as methyl ethyl canone, methyl isobutyl ketone, acetylacetone, and isobutyl ketone; Alcohols such as methanol, ethanol, n-propanol, i-propanol, n-butanol, i-butanol, or t-butanol; Acetates such as ethyl acetate, i-propyl acetate, or polyethylene glycol monomethyl ether acetate; ethers such as tetrahydrofuran or propylene glycol monomethyl ether; Or a mixture of two or more types thereof may be mentioned.

The type of surfactant is also not greatly limited, and anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, etc. can be used.

The antibacterial polymer coating composition may include 0.001 to 20 parts by weight of the surfactant based on 100 parts by weight of the urethane acrylate-based oligomer or polymer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1 to 10.

Meanwhile, the antibacterial coating layer optionally includes a monomer or oligomer having a monofunctional or polyfunctional group in addition to the urethane acrylate-based oligomer or polymer having a molar ratio of urethane functional group to (meth)acrylate-based functional group of 1 to 10. It may also be included.

The photopolymerizable compound may include a monomer or oligomer containing one or more, two or more, or three or more (meth)acrylate or vinyl groups. Specific examples of monomers or oligomers containing the (meth)acrylate include pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, and dipentaerythritol hexa(meth)acrylate. ) Acrylate, tripentaerythritol hepta(meth)acrylate, trilene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, trimethylolpropane tri(meth)acrylate, trimethylolpropane polyethoxy tri(meth)acrylate ester, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, butanediol dimethacrylate, hexaethyl methacrylate, butyl methacrylate or mixtures of two or more thereof, epoxide acrylate oligomer, ether acrylic Late oligomers, dendritic acrylate oligomers, or mixtures of two or more thereof may be mentioned. At this time, the molecular weight of the oligomer is preferably 1,000 to 10,000. Specific examples of the monomer or oligomer containing the vinyl group include divinylbenzene, styrene, or paramethylstyrene.

The antibacterial coating layer can be obtained by applying an antibacterial polymer coating composition on a predetermined substrate and photocuring the applied result. The specific type or thickness of the substrate is not greatly limited, and any substrate known to be used in the production of conventional polymer films can be used without major limitations.

The antibacterial coating layer can be obtained by applying the antibacterial polymer coating composition on a predetermined substrate and photocuring the applied result. The specific type or thickness of the substrate is not greatly limited, and any substrate known to be used in the production of conventional polymer films can be used without major limitations.

Methods and devices commonly used to apply the antibacterial polymer coating composition can be used without any restrictions, for example, bar coating method such as Meyer bar, gravure coating method, 2 roll reverse coating method, vacuum slot die coating method, 2 roll coating method, etc. can be used.

The thickness of the antibacterial coating layer may be determined depending on the purpose of the air filter, etc. For example, the antibacterial coating layer may have a thickness of 1㎛ to 100㎛.

In the step of photocuring the antibacterial polymer coating composition, ultraviolet rays or visible light with a wavelength of 200 to 400 nm can be irradiated, and the exposure amount during irradiation is preferably 50 to 2,000 mJ/cm2. The exposure time is also not particularly limited and can be appropriately changed depending on the exposure device used, the wavelength of the irradiation light, or the exposure amount.

Additionally, in the step of photocuring the antibacterial polymer coating composition, nitrogen purging, etc. may be performed to apply nitrogen atmospheric conditions.

Meanwhile, the breathable substrate may be any substrate known to be used as an air filter substrate, for example, a non-woven fabric, a woven fabric, a substrate with a mesh structure, or a porous substrate.

The thickness of the breathable substrate may be determined depending on the purpose of the air filter, etc., for example, the breathable substrate may have a thickness of 1㎛ to 100㎛.

When the breathable substrate is a non-woven fabric, it may be a single sheet of non-woven fabric or a structure in which two or more layers of non-woven fabric are laminated. For example, the breathable substrate may have a structure in which two or more nonwoven fabrics having a thickness of 10 ㎛ to 1,000 ㎛ are stacked.

The specific type or material of the nonwoven fabric is not limited, but the nonwoven fabric is composed of nylon, polyester, polyurethane, polyacrylonitrile, polyolefin, rayon-polyester resin, (meth)acrylate resin, and cellulose. It may include one or more types selected from the group.

Specific examples of the substrate including the mesh structure include a substrate including a mesh structure with pores having a diameter of 1 ㎛ to 100 ㎛, a sheet of a mesh structure with pores having a diameter of 1 ㎛ to 100 ㎛, etc. .

Meanwhile, according to another embodiment of the invention, an air purifier including the air filter may be provided.

As described above, the air filter includes the antibacterial coating layer described above and can achieve high antibacterial properties even when light in the visible region is applied. In particular, the generated active oxygen remains longer than previously known antibacterial materials, and thus has high antibacterial efficiency. Because it can implement, the air purifier can effectively remove germs or bacteria (mold, etc.) introduced from the outside or germs or bacteria (mold, etc.) generated internally.

The air purifier may include a commonly known configuration, for example, a suction part that sucks in external air, a filter part that filters the air by installing the air filter, and a device that discharges purified air through the filter part. It may include a discharge unit, and may also be provided with a light irradiation device to generate active oxygen or radicals in the antibacterial coating layer of the air filter.

The air purifier may additionally be equipped with a device for distributing the generated active oxygen or radicals, for example, an air circulation device.

The air purifier may use the air filter as a dust collection filter or pre-filter or may install these.

The air filter can be applied in various forms depending on the specific structure or purpose of the air purifier.

For example, when the air filter is used as a dust collection filter, the dust collection filter may include a breathable substrate on which one or more non-woven fabrics are laminated and the antibacterial coating layer formed on the breathable substrate. The specific shape of the dust collection filter is not greatly limited, but for example, the dust collection filter may have a polygonal sheet structure having 3 to 20 angles, a cylindrical shape, an elliptical cylindrical shape, or a polygonal pillar structure with an empty interior of 3 to 20 angles. You can.

In addition, when the air filter is used as a pre-filter, the pre-filter may include a breathable substrate including a mesh structure with pores having a diameter of 1 ㎛ to 100 ㎛ and the antibacterial coating layer formed on the breathable substrate. there is. The specific shape of the pre-filter is not greatly limited. For example, the pre-filter may have a polygonal sheet structure with 3 to 20 angles, a cylindrical shape, an elliptical cylindrical shape, or a polygonal column structure with an empty interior of 3 to 20 angles. You can. The pre-filter refers to a filter that is installed at the front end of the dust collection filter and serves to filter a relatively large volume of dust.

According to the present invention, an antibacterial air filter that can maintain high antibacterial properties for a long time and realize high antibacterial efficiency even when using light in the visible light region, and an air purifier equipped with the antibacterial air filter can be provided.

Figure 1 shows the IR spectrum of the urethane acrylate-based oligomer prepared in Preparation Example 1.
Figure 2 schematically shows the method for measuring the production amount and lifespan of singlet oxygen in Experimental Example 2.
Figure 3 schematically shows the method of measuring the antibacterial properties of the air filters of Examples and Comparative Examples according to JIS R 1702 in Experimental Example 3.
Figure 4 shows the results of confirming the antibacterial properties of the antibacterial air filter of Example 1 and the air filter of Comparative Example 4 by simulating the environment of the air purifier in Experimental Example 4.

Embodiments of the invention are explained in more detail in the examples below. However, the following examples are merely illustrative of embodiments of the invention, and the content of the present invention is not limited to the following examples.

(Manufacture example: Preparation of urethane acrylate oligomer (polymer))

[Production Example 1]

After dispersing 5g of Karenz's AOI-VM (MW 141.25) and 40g of Bayer's polyester-carbonate diol Desmophen® C1200 (Equivalent weight: 1000) in 20g of acetonitrile solution, a small amount of DBTDL, a catalyst, was added. A urethane acrylate-based oligomer (polymer) was prepared by reacting at room temperature for 5 hours. And, as shown in Figure 1, it was confirmed through the infrared spectrum that urethane acrylate was produced (the peak around 1630 cm ^-1 increased).

[Production Example 2]

After dispersing 5g of Karenz's AOI-VM (M.W 141.25) and 40g of Bayer's polyurethane-carbonate diol, Desmophen® C 850 (Equivalent weight: 200), in 20g of acetonitrile solution, a small amount of DBTDL, a catalyst, was added. After reacting at room temperature for 5 hours, a urethane acrylate-based oligomer (polymer) was prepared.

[Production Example 3]

After dispersing 5g of Karenz's AOI-VM (M.W 141.25) and 40g of Bayer's polyester-carbonate diol Desmophore VPLS2249/1 (Equivalent weight 100) in 20g of acetonitrile solution, a small amount of DBTDL, a catalyst, was added. A urethane acrylate-based oligomer (polymer) was prepared by reacting at room temperature for 5 hours.

[Example: Manufacturing of antibacterial air filter]

Example 1

Photosensitizer 5,10,15,20-tetrakis(4-methoxyphenyl)-porphine per 100 parts by weight of the urethane acrylate-based oligomer of Preparation Example 1 (molar ratio of urethane functional group to acrylate functional group is about 1) (CAS no. 22112-78-3) 1 part by weight, photoinitiator (Product name: Darocure TPO) 2 parts by weight, Surfactant (Product name: RS90 DIC) 0.1 part by weight, 50 parts by weight of toluene, 50 parts by weight of ethanol to achieve antibacterial properties. A polymer coating solution (solids concentration of 50%) was prepared.

Then, the antibacterial polymer coating solution was coated using a #10 bar on a breathable substrate made of three layers of non-woven fabric (a product containing intertwined PET fibers with a diameter of about 5 to 50 μm) with a thickness of 300 μm. Afterwards, curing was carried out at a speed of 2m/min using a UV lamp of 0.2J/cm2, and an antibacterial coating layer with a thickness of 10㎛ was formed to manufacture an antibacterial air filter.

Example 2

Except that the urethane acrylate-based oligomer of Preparation Example 2 (molar ratio of urethane functional group to acrylate functional group of about 4) was used, an antibacterial polymer coating solution (solid concentration of 50%) was prepared in the same manner as Example 1. An antibacterial air filter was manufactured by forming an antibacterial coating layer with a thickness of 10 μm.

Example 2

Unlike Example 1, an antibacterial air filter was manufactured by forming an antibacterial coating layer with a thickness of 10 μm in the same manner as Example 1, except that a breathable substrate (additional information such as type, thickness, pore size, shape, etc. is required) was used. .

[Comparative example: Preparation of polymer film]

Comparative Example 1

5 parts by weight of trimethylolpropane triacrylate (TMPTA) compared to 100 parts by weight of methyl methacrylate (MMA), photosensitizer 5,10,15,20-tetrakis(4-methoxyphenyl)-porphine (CAS no. . 22112-78-3) 1 part by weight of photoinitiator (Product name: Darocure TPO) 2 parts by weight, 0.1 part by weight of surfactant (Product name: RS90 DIC), 50 parts by weight of toluene, and 50 parts by weight of ethanol to prepare a polymer coating solution ( Concentration of solids was 50%).

Then, the polymer coating solution was coated using #10 bar, and then cured at a speed of 2 m/min using a UV lamp of 0.2 J/cm2, and a polymer film with a thickness of 10 μm was produced.

Comparative example 2

Compared to 100 parts by weight of methyl methacrylate (MMA), 5 parts by weight of trimethylolpropane triacrylate (TMPTA), photosensitizer 5,10,15,20-tetrakis (4-methoxyphenyl)- 21H, 23H- 1 part by weight of porphine cobalt (Ⅱ) (CAS no. 28903-71-1), 2 parts by weight of photoinitiator (product name: Darocure TPO), 0.1 part by weight of surfactant (product name: RS90 DIC), 50 parts by weight of toluene, ethanol 50 parts by weight were mixed to create a polymer coating solution (50% solid concentration).

Then, the polymer coating solution was coated using #10 bar, and then cured at a speed of 2 m/min using a UV lamp of 0.2 J/cm2, and a polymer film with a thickness of 10 μm was produced.

Comparative example 3

Except for using the urethane acrylate-based oligomer of Preparation Example 3 (molar ratio of urethane functional group to acrylate functional group about 11), a polymer coating solution (solid concentration of 50%) and polymer were prepared in the same manner as Example 1. A film (10 μm thick) was prepared.

[Comparative Example 4: Manufacturing of air filter]

A breathable substrate made of three layers of nonwoven fabric (a product made of intertwined PET fibers with a diameter of about 5 to 50 μm) with a thickness of 300 μm was prepared using the air filter of Comparative Example 4.

[Experimental example]

Experimental Example 1: Measurement of oxygen permeability of antibacterial coating layer of Examples and Comparative Examples

The oxygen permeability of the polymer films of Examples and Comparative Examples was measured in an atmosphere of 25 degrees and 60 RH% using an Oxygen Permeation Analyzer (Model 8000, Illinois Instruments) using the method of ASTM D 3895.

Experimental Example 2: Measurement of singlet oxygen production and lifespan of antibacterial coating layer of Examples and Comparative Examples

The production amount and lifetime of singlet oxygen of the polymer films of Examples and Comparative Examples were measured using the time-resolved phosphorescence laser spectroscopy device schematically shown in Figure 2.

Specifically, ¹ O ₂ (singlet oxygen) exhibits photoluminescence at 1275 nm, and accordingly, a near-ultraviolet photomultiplier tube (NIR-PMT) is used in the wavelength range of 900 nm to 1400 nm. The presence/absence of ¹ O ₂ production and relative amounts were measured using a time-resolved spectrum, and the movement of ¹ O ₂ was observed through a time-resolved spectrum. In the case of NIR-PMT, photoluminescence values in the 900 to 1400 nm wavelength range can be obtained. Since singlet oxygen emits light at 1275 nm, an M/C (monochromator) is installed in front of the PMT to selectively detect light emission at 1275 nm. was installed to obtain only the light emission (PL) value detected at 1275 nm.

Experimental Example 3: Measurement of antibacterial properties of antibacterial coating layers of Examples and Comparative Examples

According to JIS R 1702, the antibacterial properties of the polymer films of Examples and Comparative Examples were measured through the method schematically shown in Figure 3.

Molar ratio of urethane functional group to (meth)acrylate functional group oxygen permeability
(cc/㎡day) Singlet oxygen (1O2) antibacterial production amount
(relative value) Lifespan (us) Example 1 One 30 3.5 400 91.2 Example 2 4 70 12.0 440 99.99 Comparative Example 1 0 2 1 (reference value) 20 81 Comparative example 2 0 3 0.1 - - Comparative example 3 11 120 9.4 360 -

As shown in Table 1, the air filters of Examples 1 and 2 manufactured using urethane acrylate-based oligomers having a molar ratio of urethane functional groups to acrylate-based functional groups in the range of 4 to 10 are the air filters of Comparative Example 1. Compared to , the production of singlet oxygen was more than 3.5 times higher, and in particular, it was confirmed that the lifespan of singlet oxygen was increased by about 20 times, and the antibacterial activity was confirmed to be over 99%.

On the other hand, in the case of the air filters manufactured in Comparative Examples 1 and 2, it was confirmed that not only the amount of singlet oxygen produced was small, but also the lifespan of singlet oxygen was extremely short. In addition, in the case of the air filter manufactured in Comparative Example 3, the amount of singlet oxygen produced is large and the lifespan of singlet oxygen appears to be long, but the polymer film strength is weak and trace amounts of photosensitizer are released from the film due to the bacterial inoculated strain. There is a problem with it dissolving, and as a result, antibacterial properties were not confirmed according to the above standards.

<Experimental Example 4: Measurement of antibacterial properties of dust collection filter of air purifier>

By simulating the environment of an air purifier, the antibacterial properties of the antibacterial air filter of Example 1 and the air filter of Comparative Example 4 were confirmed.

Specifically, A nonwoven fabric with a thickness of 300㎛ (a product containing intertwined PET fibers with a diameter of about 5 ~ 50um) is laminated on the PET film, and on the other side of the nonwoven fabric, four types of dilutions containing Pseudomonas aeruginosa (C0 ~ C3: 100 %, 10%, 1%, 0.1%) were respectively coated to prepare a laminate for measuring antibacterial properties.

The antibacterial measurement laminate was brought into contact with one side of the antibacterial air filter of Example 1 (the opposite side of the antibacterial coating layer) and one side of the air filter of Comparative Example 4, respectively, and UV was applied on the opposite side where the antibacterial measurement laminate was formed. -A ray was irradiated for about 5 hours .

In addition, the results of applying four types of dilutions (C0 to C3: 100%, 10%, 1%, 0.1%) to each of the antibacterial air filter of Example 1 and the air filter of Comparative Example 4 were visually examined to determine whether bacteria remained. was confirmed and its antibacterial properties were evaluated.

As shown in Figure 4, it was confirmed that in the antibacterial air filter of Example 1, all Pseudomonas aeruginosa were killed in samples to which all concentrations of Pseudomonas aeruginosa dilutions were applied, whereas in the air filter of Comparative Example 4, 100% and 10% concentrations were used. It was confirmed that Pseudomonas aeruginosa was not completely killed in samples to which the Pseudomonas aeruginosa dilution was applied.

Claims (15)

breathable material; and
An air filter comprising: an antibacterial coating layer containing a urethane acrylate-based oligomer or polymer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1 to 10, and a photosensitizer.
According to paragraph 1,
The air filter wherein the urethane acrylate-based oligomer or polymer has a weight average molecular weight of 200 g/mol to 50,000 g/mol.
According to paragraph 1,
An air filter in which the molar ratio of the urethane functional group to the (meth)acrylate functional group in the urethane acrylate-based oligomer or polymer is 4 to 8.
According to paragraph 1,
An air filter comprising 0.01 to 5 parts by weight of the photosensitizer based on 100 parts by weight of a urethane acrylate-based oligomer or polymer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1 to 10.
According to paragraph 1,
The photosensitizer includes porphine-based compounds, porphyrin-based compounds, chlorins-based compounds, bacteriochlorins-based compounds, phthalocyanine-based compounds, naphthalocyanines-based compounds, and An air filter comprising at least one member selected from the group consisting of 5-aminoebuline esters.
According to paragraph 1,
The photosensitizer is an air filter comprising a porphine compound or a porphyrin compound into which 1 to 8 alkoxy groups of 1 to 10 carbon atoms are introduced.
According to paragraph 1,
The antibacterial coating layer has an oxygen permeability of 5 to 100 cc/m2day. According to paragraph 1,
The antibacterial coating layer has a thickness of 1㎛ to 100㎛.
According to paragraph 1,
An air filter, wherein the breathable substrate has a thickness of 10 ㎛ to 2,000 ㎛.
According to paragraph 1,
An air filter, wherein the breathable substrate is a non-woven fabric, a woven fabric, a substrate including a mesh structure, or a porous substrate.
According to paragraph 1,
An air filter, wherein the breathable substrate has a structure in which two or more non-woven fabrics having a thickness of 10 ㎛ to 1,000 ㎛ are stacked.
An air purifier including the air filter of claim 1.
According to clause 12,
An air purifier equipped with the air filter as a dust collection filter or pre-filter.
According to clause 13,
The dust collection filter includes an air permeable base material on which one or more non-woven fabrics are laminated and the antibacterial coating layer formed on the air permeable base material,
An air purifier having a polygonal sheet structure having 3 to 20 angles, a cylindrical shape, an elliptical cylindrical shape, and a polygonal pillar structure having 3 to 20 angles with an empty interior.
According to clause 13,
The pre-filter includes a breathable substrate including a mesh structure with pores having a diameter of 1 ㎛ to 100 ㎛, and the antibacterial coating layer formed on the breathable substrate,
An air purifier having a polygonal sheet structure with 3 to 20 angles, a cylindrical shape, an elliptical cylindrical shape, and a polygonal pillar structure with 3 to 20 angles with an empty interior.