KR20200071321A - Air filter and air purifier - Google Patents

Abstract

The present invention relates to an air filter and an air purifier with the air filter installed thereto, wherein the air filter comprises: a breathable substrate; and an antimicrobial coating layer comprising a photosensitizer, and a polymer or a urethane acrylate-based oligomer having a molar ratio of urethane functional groups to (meth)acrylate-based functional groups of 1-10.

Description

Air filter and air purifier

The present invention relates to air filters and air purifiers.

The photosensitizer absorbs light to generate reactive oxygen species (ROS), which irradiates light of a specific wavelength from the outside to generate free radicals or free radicals from the photosensitizer, resulting in various lesion sites or cancer cell cells. Photodynamic therapy (PDT), which induces and destroys death, is widely used.

Various attempts have been made to develop a polymer material having antimicrobial properties by using such a photodynamic reaction. For example, in Korean Patent Registration No. 10-1465964, after melting a silicone resin, etc., the melted resin and photosensitive are reacted. 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 or the like and mixing it with a photosensitizer, since the dispersibility between the photosensitizer and the silicone resin is low, the photosensitizer in the silicone resin may not be homogeneously distributed but can be aggregated. In addition, when melting with a silicone resin, since it is impossible to control the thickness of the silicone after melting, there is a limitation in that it is not easy to produce a product or is not suitable for mass production according to the applied field or application.

In addition, when using a coating solution formed by dissolving a silicone resin and a photosensitizer in a solvent, it is known that a certain level of antibacterial property can be achieved without being significantly limited in the application field, but sufficient antimicrobial properties are exhibited when using light in the visible light region. It is not easy to produce active oxygen to the extent that it is possible, and there is a limitation in that excess free energy must be irradiated for a relatively long period of time because the generated active oxygen is present only for a very short time.

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

The present invention is to provide an antimicrobial air filter capable of maintaining high antibacterial properties for a long time and realizing high antimicrobial efficiency even by using light in a visible light region.

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

In this specification, a breathable substrate; And an antimicrobial coating layer comprising a urethane acrylate oligomer or a polymer having a molar ratio of a urethane functional group to a (meth)acrylate functional group or a polymer and a photosensitizer, wherein an air filter is provided.

Further, in the present specification, an air purifier including the air filter may be provided.

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

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

According to one embodiment of the invention, the breathable substrate; And an antimicrobial coating layer comprising a urethane acrylate oligomer or a polymer having a molar ratio of a urethane functional group to a (meth)acrylate functional group or a polymer and a photosensitizer; and an air filter may be provided.

The present inventors have conducted research on materials having functional properties such as antimicrobial properties by using a photosensitizer, and the urethane acrylate oligomer or polymer having a molar ratio of urethane functional groups to 1 to 10 compared to the (meth)acrylate functional groups is used. The photocurable coating prepared by mixing the photosensitizer can be easily applied to various fields and is suitable for mass production, as well as realizing high antibacterial properties even when applying light in the visible region when manufacturing it as an actual coating film or coating molding. In particular, it has been confirmed through experiments that the free radicals generated can retain high antimicrobial efficiencies by remaining for a long time compared to previously known antimicrobial materials.

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, 5 to 100 cc/m 2 day, or 20 to 90 cc/m 2 day, or 25 to 80 cc/m 2 day oxygen permeability.

When light in the visible region is irradiated to the antimicrobial coating layer, free radicals or free radicals are generated from the photosensitizer contained in the antimicrobial coating layer. As described above, the antimicrobial coating layer has oxygen permeability within the above-described range. In addition, while the free radicals can be produced more efficiently, the time during which free radicals remain can be significantly increased.

When 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 antimicrobial coating layer is significantly lowered, and active oxygen is not sufficiently generated when irradiated with visible light. However, it may be difficult to apply to various applications because antibacterial properties are not realized.

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 occur at a certain level upon irradiation with visible light, but the strength of the membrane of the antibacterial coating layer is lowered and supported. The photosensitive agent may leak out of the trace film, and secondary side reactions (eg, harmful effects on the human body and environmental pollution due to the photosensitive agent) to the leaked photosensitive agent may be caused, and the antibacterial property may also be caused. Due to the low hardness of the coating layer, it may be difficult to apply it to various applications.

The urethane acrylate 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 oligomer or polymer is 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 of polystyrene conversion measured by GPC method.

As described above, when the light of the visible light region is irradiated to the antibacterial coating layer, the photosensitive agent may be reflected to generate active oxygen, etc. For this purpose, the antibacterial coating layer may include a photosensitive agent in a predetermined content. have. Specifically, the antimicrobial coating layer may include 0.01 to 5 parts by weight of the photosensitive agent relative to 100 parts by weight of a urethane acrylate oligomer or polymer having a molar ratio of urethane functional groups to 1 to 10 compared to the (meth)acrylate functional groups.

Meanwhile, as the photosensitizer, a commonly known compound may be used, for example, a porphine compound, a porphyrins compound, a chlorins compound, a bacteriochlorins compound, and a phthalocyanine. Phthalocyanine compounds, naphthalocyanines compounds, 5-aminoevuline esters, or two or more compounds thereof.

However, in order to realize higher antibacterial and antimicrobial retention performance in the antimicrobial coating layer, it is preferable to use a porphine-based compound or porphyrins compound, more preferably 5,10 as the photosensitizer. ,15,20-tetrakis(4-methoxyphenyl)-phosphine or the like, or a phosphine compound having 1 to 8 phenyl groups having 1 to 8 alkoxy groups introduced therein.

Meanwhile, the antimicrobial polymer coating composition forming the antimicrobial coating layer may include a photoinitiator in a predetermined content. Specifically, the antimicrobial polymer coating composition may include 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 1 to 10 compared to the (meth)acrylate-based functional groups.

The specific example of the photoinitiator is not limited, and a commonly known photoinitiator can be used without great limitation. As a specific example of the photoinitiator, a benzophenone-based compound, acetophenone-based compound, biimidazole-based compound, triazine-based compound, oxime-based compound, or a mixture of two or more thereof may be used.

The antimicrobial polymer coating composition may further include an organic solvent or a surfactant. The organic solvent may be added at the time of mixing each component included in the antimicrobial polymer coating composition or may be included in the antimicrobial polymer coating composition while each component is added in a dispersed or mixed state to the organic solvent. For example, the antimicrobial polymer coating composition may include an organic solvent such that the concentration of the total solids 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 kenone, methyl isobutyl ketone, acetyl acetone or 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 mixtures of two or more of these.

The type of the surfactant is also not particularly limited, and anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants may be used.

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

On the other hand, the antimicrobial coating layer is optionally added to the urethane acrylate oligomer or polymer having a molar ratio of urethane functional groups to 1 to 10 compared to the (meth)acrylate-based functional group or a monomer or oligomer having a monofunctional or multifunctional functional group. It may include.

The photopolymerizable compound may include a monomer or oligomer containing one or more, or two or more, or three or more (meth)acrylate or vinyl groups. Specific examples of the monomer or oligomer including the (meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth) )Acrylate, tripentaerythritol hepta(meth)acrylate, trilene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, trimethylolpropane tri(meth)acrylate, trimethylolpropane polyethoxy tri(meth)acrylic Rate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, butanediol dimethacrylate, hexaethyl methacrylate, butyl methacrylate or mixtures of two or more thereof, epoxide acrylate oligomers, etheracrylics Rate oligomers, dendritic acrylate oligomers, or mixtures of two or more thereof. 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 antimicrobial coating layer can be obtained by applying an antimicrobial polymer coating composition on a predetermined substrate and photocuring the applied result. The specific type or thickness of the substrate is not particularly limited, and a substrate known to be used in the production of a conventional polymer film can be used without much limitation.

The antimicrobial coating layer can be obtained by applying the antimicrobial polymer coating composition on a predetermined substrate and photocuring the applied product. The specific type or thickness of the substrate is not particularly limited, and a substrate known to be used in the production of a conventional polymer film can be used without much limitation.

The methods and devices commonly used to apply the antimicrobial polymer coating composition can be used without particular limitation, 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 according to the use of the air filter, for example, the antibacterial coating layer may have a thickness of 1㎛ to 100㎛.

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

In addition, in the step of photocuring the antimicrobial polymer coating composition, nitrogen purging may be performed to apply nitrogen atmospheric conditions.

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

The thickness of the breathable substrate may be determined according to the use 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 layer non-woven fabric, or may have a structure in which two or more layers of non-woven fabrics are stacked. For example, the breathable substrate may have a structure in which two or more nonwoven fabrics having a thickness of 10 μm to 1,000 μm are stacked.

Although the specific type or material of the nonwoven fabric is not limited, 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 selected from the group.

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

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

As described above, the air filter may implement a high antibacterial property even by applying light in the visible light region, including the above-mentioned antibacterial coating layer, and in particular, the generated free radicals remain for a long time compared to previously known antimicrobial materials and have high antibacterial efficiency Since it is possible to implement, the air purifier can effectively remove bacteria or bacteria (mold, etc.) or bacteria that occur from the inside.

The air purifier may include a commonly known configuration, for example, a suction unit for sucking air outside, and an air filter or the like is installed to discharge purified air through the filter unit for filtering air and the filter unit. A discharge unit may be included, and a light irradiation device may be provided to generate free radicals or radicals in the antibacterial coating layer of the air filter.

The air purifier may further include a device for distributing generated free radicals or oxygen, for example, an air circulation device.

The air purifier may use the air filters as dust collecting filters or pre-filters or install them.

The air filter may be applied in various forms according to a specific structure or use of the air cleaner.

For example, when the air filter is used as a dust collecting filter, the dust collecting filter may include a breathable substrate on which one or more nonwoven fabrics are laminated and the antibacterial coating layer formed on the breathable substrate. The specific shape of the dust collecting filter is not particularly limited, but, for example, the dust collecting filter has a polygonal sheet structure having a triangular angle to 20 angle, a cylindrical shape, an elliptical cylindrical shape, and a hollow triangular column shape having a triangular angle to 20 angle angle. Can be.

In addition, when the air filter is used as a pre-filter, the pre-filter may include a breathable substrate including a mesh structure having pores having a diameter of 1 μm to 100 μm and the antibacterial coating layer formed on the breathable substrate. have. The specific shape of the pre-filter is not particularly limited. For example, the pre-filter has a polygonal sheet structure having a triangular angle to 20 angles, a cylindrical shape, an elliptical cylindrical shape, and a polygonal columnar structure having a hollow angle of 3 to 20 angles. Can be. The pre-filter refers to a filter installed at the front end of the dust collecting filter to filter relatively large volumes of dust.

According to the present invention, it is possible to provide an antibacterial air filter and an air purifier equipped with the antibacterial air filter capable of maintaining high antibacterial properties for a long time and realizing high antibacterial efficiency even by using light in a visible light region.

Figure 1 shows the IR spectrum of the urethane acrylate oligomer prepared in Preparation Example 1.
Figure 2 schematically shows a method for measuring the production amount and lifetime of single oxygen (singlet oxygen) in Experimental Example 2.
3 schematically shows a 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 each of the air filters of Comparative Example 4 and the antibacterial air filter of Example 1 by simulating the environment of the air purifier in Experimental Example 4.

Embodiments of the invention will be described in more detail in the following examples. However, the following examples are merely illustrative of embodiments of the invention, and the contents of the present invention are not limited by the following examples.

(Production Example: Preparation of urethane acrylate oligomer (polymer))

[Production Example 1]

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

[Production Example 2]

After dispersing 5 g of Karenz's AOI-VM (MW 141.25) and 40 g of Bayer's polyurethane-carbonate diol Desmophen® C 850 (Equivalent weight: 200) in 20 g 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 5 g of Karenz's AOI-VM (MW 141.25) and 40 g of Bayer's polyester-carbonate diol Desmophore VPLS2249/1 (Equivalent weight 100) in 20 g of acetonitrile solution, add a small amount of catalyst, DBTDL. A urethane acrylate oligomer (polymer) was prepared by reacting at room temperature for 5 hours.

[Example: Preparation of antibacterial air filter]

Example 1

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

In addition, the antimicrobial polymer coating solution was coated with #10 bar on a breathable substrate having three layers of a non-woven fabric having a thickness of 300 μm (a product in which PET fibers having a diameter of 5 to 50 um are intertwined). Thereafter, curing was performed at a rate of 2 m/min using a UV lamp of 0.2 J/cm 2, and an antibacterial air filter was prepared by forming a 10 μm thick antibacterial coating layer.

Example 2

In the same manner as in Example 1, except that the urethane acrylate oligomer of Preparation Example 2 (molar ratio of urethane functional group to acrylate functional group is about 4) was used, and the antimicrobial polymer coating solution (concentration of solid content of 50%) was used. An antimicrobial air filter was prepared by forming a 10 μm thick antibacterial coating layer.

Example 2

Unlike Example 1, an antibacterial air filter was prepared by forming a 10 μm thick antimicrobial coating layer in the same manner as in Example 1, except that an additional substrate such as a breathable substrate (type, thickness, pore size, shape, etc. was 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), 5,10,15,20-tetrakis(4-methoxyphenyl)-phosphine (CAS no 22112-78-3) 1 part by weight, 2 parts by weight of photoinitiator (trade name: Darocure TPO), 0.1 parts by weight of surfactant (trade name: RS90 DIC Co.), 50 parts by weight of toluene, 50 parts by weight of ethanol, polymer coating solution ( Solids concentration of 50%).

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

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- Porpine cobalt (II) (CAS no. 28903-71-1) 1 part by weight, photoinitiator (trade name: Darocure TPO) 2 parts by weight, surfactant (trade name: RS90 DIC) 0.1 parts by weight, toluene 50 parts by weight, ethanol By mixing 50 parts by weight, a polymer coating solution (concentration of solid content 50%) was prepared.

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

Comparative Example 3

Polymer coating solution (50% solids concentration) and polymer in the same manner as in Example 1, except that the urethane acrylate oligomer of Preparation Example 3 (molar ratio of urethane functional group to acrylate functional group is about 11) was used. A film (10 μm thick) was prepared.

[Comparative Example 4: Preparation of air filter]

A non-woven fabric having a thickness of 300 µm (a product in which PET fibers having a diameter of about 5 to 50 um is entangled) was prepared with the air filter of Comparative Example 4 in a layered structure with a breathable substrate.

[Experimental Example]

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

Oxygen permeability of the polymer films of Examples and Comparative Examples was measured under an atmosphere of 25°C and 60RH% using an Oxygen Permeation Analyzer (Model 8000, manufactured by Illinois Instruments) by the method of ASTM D 3895.

Experimental Example 2: Measurement of the production amount and lifetime of single oxygen in the antibacterial coating layers of Examples and Comparative Examples

Using the time-resolved phosphorescence laser spectroscopy apparatus schematically shown in FIG. 2, the production amount and lifetime of singlet oxygen of the polymer films of Examples and Comparative Examples were measured.

Specifically, ¹ O ₂ (single oxygen, singlet oxygen) shows light emission (photoluminescence) at 1275 nm. Accordingly, near infrared photomultiplier tubes (NIR-PMT) are used in the wavelength range of 900 nm to 1400 nm. The presence/absence and relative amount of ¹ O ₂ production were measured by using, and the movement of ¹ O ₂ was observed through a time-resolved spectrum. In the case of NIR-PMT, a photoluminescence value in a wavelength range of 900 to 1400 nm can be obtained. Since singlet oxygen exhibits light emission at 1275 nm, in order to selectively detect light emission at 1275 nm, M/C (monochromator) in front of PMT To obtain only the light emission (PL) value detected at 1275nm.

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

The antimicrobial properties of the polymer films of Examples and Comparative Examples were measured through the method schematically shown in FIG. 3 according to JIS R 1702.

Molar ratio of urethane functional groups to (meth)acrylate functional groups Oxygen permeability
(cc/㎡day) Singlet oxygen( 1O2) Antibacterial Production
(Relative value) Life (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 to 2 prepared using urethane acrylate oligomers having a molar ratio of urethane functional groups to 4 to 10 compared to acrylate functional groups are the air filters of Comparative Example 1 Compared to that, the amount of singlet oxygen production was higher than 3.5 times, and it was confirmed that the lifetime of singlet oxygen was increased by about 20 times, and the antibacterial activity was found to be 99% or more.

On the other hand, in the case of the air filters produced in Comparative Examples 1 and 2, it was confirmed that not only the production amount of singlet oxygen was small, but also the life of singlet oxygen was extremely short. In addition, in the case of the air filter prepared in Comparative Example 3, the amount of singlet oxygen is large and the lifetime of singlet oxygen is long, whereas the polymer membrane strength is weak, so that a small amount of photosensitive agent is out of the film by the strain inoculated with bacteria. There is a problem in that it melts, and accordingly, antibacterial properties according to the above standards have not been confirmed.

<Experimental Example 4: Measurement of antibacterial properties of the dust filter of an air cleaner>

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

Specifically, A nonwoven fabric having a thickness of 300 μm (a product in which PET fibers having a diameter of about 5 to 50 um is entangled) is laminated on a PET film, and four kinds of diluents containing Pseudomonas aeruginosa on the other side of the nonwoven fabric (C0 to C3: 100 %, 10%, 1%, 0.1%), respectively, to prepare a laminate for measuring antibacterial properties.

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

In addition, the results of applying four types of diluents (C0 to C3: 100%, 10%, 1%, 0.1%) for each of the antibacterial air filter of Example 1 and the air filter of Comparative Example 4 visually indicate whether the bacteria remain. The antibacterial activity was evaluated by confirming with.

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

Claims (15)

Breathable substrate; And
The air filter comprising;; a (meth) acrylate-based functional group compared to a urethane acrylate oligomer having a molar ratio of urethane functional groups of 1 to 10 or an antimicrobial coating layer comprising a polymer and a photosensitizer.
According to claim 1,
The urethane acrylate oligomer or polymer has a weight average molecular weight of 200 g/mol to 50,000 g/mol, air filter.
According to claim 1,
The air filter having a molar ratio of a urethane functional group to a (meth)acrylate functional group in the urethane acrylate-based oligomer or polymer, 4 to 8.
According to claim 1,
The air filter comprising 0.01 to 5 parts by weight of the photosensitive agent relative to 100 parts by weight of the urethane acrylate oligomer or polymer having a molar ratio of urethane functional groups to 1 to 10 compared to the (meth)acrylate functional groups.
According to claim 1,
The photosensitizer is a porphine-based compound, a porphyrins compound, a chlorins compound, a bacteriochlorins compound, a phthalocyanine compound, a naphthalocyanines compound, and An air filter comprising at least one member selected from the group consisting of 5-aminoevuline esters.
According to claim 1,
The photosensitive agent is an air filter comprising a phosphine compound or a porphyrin compound in which 1 to 8 phenyl groups having 1 to 10 carbon atoms are introduced.
According to claim 1,
The antimicrobial coating layer has an oxygen permeability of 5 to 100 cc/m 2 day, air filter. According to claim 1,
The antibacterial coating layer has a thickness of 1㎛ to 100㎛, air filter.
According to claim 1,
The air-permeable substrate has an air filter having a thickness of 10 μm to 2,000 μm.
According to claim 1,
The air-permeable substrate is a non-woven fabric, a woven fabric, a substrate including a mesh structure, or a porous substrate, an air filter.
According to claim 1,
The air-permeable substrate has a structure in which two or more nonwoven fabrics having a thickness of 10 μm to 1,000 μm are stacked.
An air purifier comprising the air filter of claim 1.
The method of claim 12,
An air cleaner in which the air filter is installed as a dust collecting filter or a pre-filter.
The method of claim 13,
The dust collecting filter includes a breathable substrate on which one or more nonwoven fabrics are laminated and the antibacterial coating layer formed on the breathable substrate,
An air purifier having a polygonal sheet structure having a triangular angle to 20 angle, a cylindrical shape, an elliptical cylindrical shape, and a polygonal columnar structure having an angle of 3 to 20 angles inside.
The method of claim 13,
The pre-filter includes a breathable substrate including a mesh structure having pores having a diameter of 1 μm to 100 μm and the antibacterial coating layer formed on the breathable substrate,
An air purifier having a polygonal sheet structure having a triangular angle to 20 angle, a cylindrical shape, an elliptical cylindrical shape, and a polygonal columnar structure having an angle of 3 to 20 angles inside.

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