KR20200036960A - Sterilizing Air Putifier - Google Patents

Abstract

The present invention relates to a sterilizing filter, and more specifically, to a sterilizing filter including: a piezoelectric element capable of generating an output voltage of 100 mV or more by a pressure change; an air blowing means that can change the pressure of the piezoelectric element by blowing air to one side of the piezoelectric element; a sterilizing activation layer bonded to the other side of the piezoelectric element to activate a sterilizing function by a current generated in the piezoelectric element; and a filtration member capable of filtering predetermined particles on the sterilizing active layer. Sterilizing activity is increased by electric energy generated by the piezoelectric element to improve a removal rate of fungi, bacteria or viruses in the air.

Description

Sterilizing Air Putifier}

The present invention relates to a sterilized air purifier, and more specifically, to a sterilized air purifier using a piezoelectric element-based filtration type sterilizer to collect and sterilize bacteria or viruses contained in the air.

Recently, as the indoor dwell time of modern people rapidly increases, interest in indoor air quality is increasing, and especially, as the concentration of ultra fine dust increases, the ergonomic effect of fine dust has emerged. It is known that the ultrafine dust itself easily passes through the human airways and has a relatively large negative effect on PM 2.5 or less compared to dust having the diameter above, and, in addition, pathogenic bacteria attached to the dust and Viruses are also known to cause health problems such as diseases. Regarding the above social issues, air purifiers are generally used in homes and office spaces such as apartments, but air purifiers are specialized in removing particulate matter, such as dust, but are vulnerable to the removal of bacteria and viruses. Is showing. For example, Korean Registered Patent No. 1638065 uses a hepa filter that generates a pressure loss of 25mmAq level, so it is possible to remove ultra fine particles with a diameter of 0.1 micrometers, but it is insufficient to remove pathogenic bacteria and viruses. In addition, Korean Patent Publication No. 2014-00032245 and Japanese Patent Publication No. 2015-150524 remove particulate matter without using a hepa filter as described above, but these prior arts also show difficulties in removing bacteria and viruses. have. In addition, technologies for removing pathogenic bacteria or viruses from particulate matters using chemicals or chemicals are also being developed, and it has been found that colloidal silver nanoparticles have strong antibacterial activity against about 650 harmful bacteria and fungi. have. The silver colloidal particles exhibit a sterilizing effect on various bacteria, viruses and allergic diseases by stopping the enzymatic action by inhibiting the penetration of bacteria and viruses into the cells, or inhibiting cell wall destruction and metabolism of bacteria. In this regard, US Patent Publication No. 2006-0020108 discloses a method of preparing a polyester master batch by mixing polymerization of glycol containing a silver precursor with terephthalic acid. However, in the above patent, a problem in which only a part of silver is reduced from the silver precursor may occur, so that the antibacterial properties due to the silver particles may be reduced. In addition, Korean Patent Publication No. 2017-0040919 discloses an antibacterial deodorant composition for tents using a coating solution containing silver nano-sol containing silver particles at a concentration of 500 to 2000 ppm. In the above patent, high concentrations of silver nanoparticles are used to maintain the expression and persistence of antimicrobial activity, but silver nanoparticles can aggregate and aggregate with each other, and as shown in Non-Patent Document 1, there is a problem that human toxicity may occur.

Korean Registered Patent No. 1638065 Korean Patent Publication No. 2014-00032245 Japanese Patent Publication No. 2015-150524 US Patent Publication No. 2006-0020108 Korean Patent Publication No. 2017-0040919

 Soo-Jin Kim and 15 others, research on harmfulness to manufactured silver nanomaterials, National Institute of Environmental Sciences, NIER No. 2010-49-1224

In order to solve the above problems, an object of the present invention is to provide an air purifier capable of exerting excellent antimicrobial activity by using silver nanoparticles having a low human risk content.

In addition, the present invention uses a low content of silver nanoparticles in order to minimize human risk as described above, while the sterilization function is activated by the piezoelectric element in order to secure a high level of sterilization power, thereby removing fungi, bacteria, or viruses in the air. The purpose is to provide an air purifier that can.

In addition, an object of the present invention is to provide an air purifier capable of exerting excellent antibacterial activity without coating silver nanoparticles on a filter.

The air purifier according to the present invention includes an inlet through which air is introduced, a purification unit for purifying air introduced into the inlet, an outlet for discharging purified air from the purification unit, and a blower fan for introducing air into the purification unit through the inlet. The purification unit is a piezoelectric element capable of generating an output voltage of 100 mV or more by a pressure change; Wind discharge means that can change the pressure of the piezoelectric element by emitting wind to one side of the piezoelectric element; A sterilization active layer that is bonded to the other side of the piezoelectric element and has a sterilizing function activated by a current generated in the piezoelectric element; And a filtering member capable of filtering predetermined particles on the sterilizing active layer. Here, a polymer cover layer may be additionally formed between the piezoelectric element and the sterilizing active layer. In addition, the polymer cover layer may be made of a conductive polymer.

The conductive polymer is polyethylene terephthalide (PET), polyethylene naphthalate (PEN), polyimide (PI), polyethersulfone (PES), polyacrylate (PAR), polyether imide (PEI), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cyclo olefin polymer (COP), cyclo olefin copolymer (COC), cellulose triacetate (CTA), cellulose acetate propionate (CAP), norbor It may be one or more selected from the group consisting of Nene-based resin and combinations thereof.

The cyclo olefin polymer may be a heterocyclic compound.

The heterocyclic compound may be polypyrrole.

The piezoelectric element may generate an output voltage of 100 to 400 mV.

The piezoelectric element is one selected from the group consisting of crystal, Rochelle salt, barium titanate (BaTiO ₃ ), ammonium dihydrogen phosphate, ethylenediamine tartrate crystal, PZT and polyvinylidene fluoride (PVDF). It may be made of the above materials.

The predetermined particles may have a size of 2.5 to 10 μm.

The filtration member may be made of at least one material selected from the group consisting of polynylon, polyamide, polyphenylene sulfide (PPS), polyester, polypropylene (PP) and polyterafluoroethylene (PTFE).

The sterilizing active layer may include 0.01 to 0.1% of nanoparticles of silver (Ag), copper, or a mixed metal thereof.

The sterilizing active layer may be a coating layer or a film layer.

The air purifier may be to remove 74 to 95% bacteria.

The air purifier according to the present invention has an advantage in that the sterilizing layer containing silver nanoparticles is activated by electric energy generated through the piezoelectric element, and thus the removal efficiency of fungi, bacteria, or viruses is excellent.

In addition, the air purifier according to the present invention has the advantage of exerting excellent antibacterial activity by using low content of silver nanoparticles.

In addition, the air purifier according to the present invention has the advantage of minimizing the harmfulness to the human body by using a low content of silver nanoparticles.

In addition, the air purifier according to the present invention has the advantage of improving the air cleaning ability of hospitals, pharmaceutical companies, food companies, and multi-use facilities by filtering fine dust as well as antibacterial effects.

Figure 1 shows the configuration of the air purifier of the present invention.
Figure 2 shows a first embodiment of the sterilizing portion of the air purifier according to the present invention.
3 shows a process in which voltage is generated in a piezoelectric element applied to the present invention.
Figure 4 shows a second embodiment of the sterilizing portion of the air purifier according to the present invention.
Figure 5 shows a third embodiment of the sterilizing unit of the air purifier according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION The detailed description set forth below, in conjunction with the accompanying drawings, is intended to describe exemplary embodiments of the invention, and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, one of ordinary skill in the art to which the present invention pertains knows that the present invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted, or block diagrams centered on the core functions of each structure and device may be illustrated.

Throughout the specification, when a part "comprising or including" a certain component, it means that other components may be further included instead of excluding other components, unless otherwise specified. do. In addition, the term "… part" described in the specification means a unit that processes at least one function or operation.

In addition, "a (an or an)", "one (one)", "the (the)" and similar related terms in the context of describing the present invention (especially in the context of the following claims) is different herein. It can be used in a sense including both singular and plural unless indicated or clearly contradicted by context.

In describing embodiments of the present invention, when it is determined that a detailed description of known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

The preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 each show an air purifier according to an example of the present invention.

As shown in Fig. 1, the air purifier according to the present invention is provided with a main body 1 having a predetermined shape, and an intake port 2 for being coupled to an open front surface of the main body and allowing air to flow into the main body. It has a front panel (not shown). The upper surface of the main body is provided with an exhaust port 6 for discharging the air introduced into the intake port 2 back into the indoor space, and the interior air of the main body 1 is forced through the intake port 2 and the exhaust port 6. A blower fan 5 for circulation and a purification unit for purifying the circulated indoor air are installed, and the purification unit includes a sterilizing unit 3 and a fine dust filtering unit 4.

Figure 2 shows the configuration of the sterilization unit 3, the piezoelectric element 100, the wind release means 200 formed on the lower portion of the piezoelectric element 100, the sterilizing active layer formed on the upper portion of the piezoelectric element 100 A filtering member 400 is formed on the 300 and the sterilizing active layer 300. In general, when a pressure that is a physical force is applied from the outside to the piezoelectric element 100, a voltage of 100 to 400 mV is generated while the piezoelectric element is deformed by twisting or impact due to the pressure transmitted to the piezoelectric element 100. Occurs. This principle is a phenomenon in which electrical polarization occurs on the surface of a crystal when a force is applied to a solid, called a piezo effect, and the process of generating electric energy in the piezoelectric element 100 is as follows. As shown in FIG. 3, when a force F is applied to the piezoelectric element 100 from the outside, stress is generated in the internal direction of the piezoelectric element 100 and the piezoelectric element 100 is compressed (t ₀ > t ₁ ). Positive and negative charges accumulate on the electrode A, which is the anode metal plate, and the electrode B, which is the cathode metal plate. When the positive electrode is generated at the electrode A and the negative ion is generated at the electrode B, and the internal pressure (P) of the piezoelectric element is large, stress is generated in the outer direction of the piezoelectric element, so that the piezoelectric element is stretched (t ₀ <t ₂ ) and the electrode A and Positive and negative charges are accumulated in electrode B, respectively, and anions are generated in electrode A and cations are generated in electrode B, respectively.

The piezoelectric element 100 is polarized by the air introduced from the wind discharge means 200 formed on one side to generate an output voltage of 100 mV or more by the above-described principle, preferably 100 to 400 mV It is good to generate the output voltage.

When the piezoelectric element 100 generates an output voltage of less than 100 mV, the sterilization effect may be lowered due to a low voltage, and when it exceeds 400 mV, the voltage may increase and have a harmful effect on the human body.

The piezoelectric element 100 is not particularly limited as long as it is generally used in the art, but is not limited to crystals, Rachelle salt, barium titanate (BaTiO ₃ ), ammonium dihydrogen phosphate, ethylenediamine tartrate, PZT And one or more materials selected from the group consisting of polyvinylidene fluoride (PVDF). Preferably, the piezoelectric element 100 is preferably made of polyvinylidene fluoride (PVDF), which is easily modified in shape depending on the shape of the contacted portion when used as a flexible polymer piezoelectric material. For example, a vent hole is formed to allow air introduced from the wind discharge means 200 to pass therethrough, and a plurality of thermoelectric elements 100 may be manufactured in a flexible support (not shown). The wind emission means 200 for changing the pressure of the piezoelectric element 100 may be a blower capable of inhaling outside air and generating a flow of internal air. Specifically, the blower may include a fan and a motor, and the pressure may be changed by emitting wind to the piezoelectric element as the fan rotates.

In addition, the wind discharge means 200 can be controlled by a controller (not shown) the driving speed of the fan, and accordingly, the amount of electrical energy generated by the piezoelectric element 100 can also be adjusted.

On the other side of the piezoelectric element 100, a sterilization active layer 300 is formed that activates the sterilization function by the electric energy generated in the piezoelectric element 100.

The sterilizing active layer 300 may be formed of a coating layer or a film layer, and may include nanoparticles of silver, copper, or mixed metals thereof.

In this case, the sterilization active layer 300 may include 0.01 to 0.1% of silver (Ag), copper, or mixed metal nanoparticles thereof.

If the metal nanoparticles contain less than 0.01%, the sterilizing power may be lowered, and when it exceeds 0.1%, the particles may aggregate, resulting in uneven thickness and deterioration of workability, which is inefficient in terms of economy.

As described above, by forming the sterilizing active layer 300 on the other surface of the piezoelectric element 100, silver or copper nanoparticles are activated by electric energy generated from the piezoelectric element 100 and released as silver or copper ions, and fungi in the air. , Can remove virus or bacteria.

The sterilizing active layer 300 is a piezoelectric coating solution containing silver or copper nanoparticles and a solvent using reverse coating, gravure coating, spin coating, screen coating, fountain coating, dip coating, bar coating, and spraying. After coating on the device 100 may be prepared by drying.

In addition, the sterilizing active layer 300 is not only antifungal, antibacterial, antiviral, etc., but also maintains a thin and even coating property, iron oxide (Fe ₂ O ₃ , Fe ₃ O ₄ ), manganese dioxide (MnO ₂ ), persimmon Hepatitis, copper oxide (CuO), copper nitrate (Cu (NO ₃ ) ₂ · 3H ₂ O), sodium borate dehydrate (Na ₂ B ₄ O ₇ · 10H ₂ O), and one or more particles selected from the group consisting of ceramics May be further included.

When the sterilizing active layer 300 is formed as a film layer, it may be prepared by applying a coating solution containing silver or copper nanoparticles and a solvent on a breathable polymer film.

The breathable polymer film may be manufactured by extruding and stretching by mixing an inorganic material such as calcium carbonate with a polyolefin, but is not limited thereto, and a commercially available polyolefin breathable film known in the art may be purchased and used. In addition, the coating solution may further include a dispersant to minimize aggregation between silver or copper nanoparticles to form nanoparticles of uniform particle size.

The polymer film may be manufactured by bonding on a piezoelectric element, and the bonding method is bonded by a method commonly used in the art, such as bonding, ultrasonic welding, high-frequency welding, and thermal welding. For example, it may be bonded using an adhesive composition comprising an adhesive resin. The adhesive resin is, for example, acrylic copolymer, natural rubber, styrene-isoprene-styrene (SIS) block copolymer, styrene-butadiene-styrene (SBS) block copolymer, styrene-ethylenebutylene-styrene (SEBS) block copolymer Conventional polymers such as coalescence, styrene-butadiene rubber, polybutadiene, polyisoprene, polyisobutene, butyl rubber, chloroprene rubber, and silicone rubber can be used, and it is preferable to use an acrylic copolymer that is easy to control adhesion. Do. On the sterilization active layer 300, a filtering member 400 capable of filtering predetermined particles is formed.

The filtering member 400 filters particles having a size of 2.5 to 10 μm present in the air from which fungi, viruses, and bacteria have been removed by the sterilizing active layer 300.

In this case, the filtration member 400 may be a pleated filter or a mesh filter to filter particles having a size of 2.5 to 10 μm. Preferably, a mesh filter having a size of 70 or more wood holes through which air can pass and remove dust and debris from the air is good. Here, the meaning of “70 trees” means that the number of networks formed in a region corresponding to 1 cm in width and 1 in the mesh filter is 70.

The filtration member 400 may be made of one or more materials selected from the group consisting of polynylon, polyamide, polyphenylene sulfide (PPS), polyester, polypropylene (PP), and polyterafluoroethylene (PTFE). In addition, it is preferable that it is made of polyester in consideration of human hazards and pressure loss.

In addition, the filtering member 400 may be integrally formed on the sterilization active layer 300 or detachably received in a replaceable structure.

As such, it is possible to filter not only the antimicrobial effect on fungi, viruses, or bacteria, but also fine dust, so that when used in an air purification device, the air cleaning ability of hospitals, pharmaceutical companies, food companies, and multi-use facilities can be improved.

FIG. 4 shows another embodiment of the present invention, and as shown in FIG. 2, a polymer cover layer 500 is additionally formed between the piezoelectric element 100 and the sterilizing active layer 300.

Specifically, the sterilizing part of FIG. 4 is a case where the polymer cover layer 500 is formed on the other surface of the piezoelectric element 100, and sterilization by electric energy generated from the piezoelectric element 100 is the same as described in FIG. The active layer 300 is activated and silver or copper ions are released to have sterilizing power.

At this time, by further including a polymer cover layer 500 on the other side of the piezoelectric element 100, the electrical conductivity is improved from the piezoelectric element 100 to the sterilizing active layer 300, the silver contained in the sterilizing active layer 300 Alternatively, the sterilizing effect may be increased even in a state where the content of the copper nanometal is small.

The polymer cover layer 500 may be made of a conductive polymer, and the material of the conductive polymer is not particularly limited as long as it does not inhibit the antifungal, antibacterial, and antiviral properties of the activated metal nanoparticles. Specifically, polyethylene terephthalide (PET), polyethylene naphthalate (PEN), polyimide (PI), polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyphenylene sulfide (PPS) ), Polyarylate, polycarbonate (PC), cyclo olefin polymer (COP), cyclo olefin copolymer (COC), cellulose tri acetate (CTA), cellulose acetate propionate (CAP), norbornene resin And it can be used one or more selected from the group consisting of these.

The conductive polymer is preferably a cyclo olefin polymer in consideration of conductivity, price competitiveness, and ease of handling, and the cyclo olefin polymer is more preferably a heterocyclic compound, and the heterocyclic compound is more preferably polypyrrole.

5 shows another embodiment of the air purifier according to the present invention, as shown in FIG. 5, a heterocyclic compound as a polymer cover layer 500 between the piezoelectric element 100 and the sterilizing active layer 300 A polypyrrole layer 600 made of phosphorus polypyrrole may be formed. The polymer cover layer 500 of FIG. 4 or the polypyrrole layer 600 of FIG. 5 may be manufactured in a film form having pores to allow air supplied from the wind emission means 200 to pass therethrough.

In this way, the polymer cover layer 500 of FIG. 4 or the polypyrrole layer 600 of FIG. 5 bonded to one surface of the piezoelectric element 100 is formed with a sterilizing active layer 300 on the other surface. The electrical conductivity is increased by the polymer cover layer 500 of FIG. 4 or the polypyrrole layer 600 of FIG. 3 to improve the sterilizing power of the sterilization active layer 300. In addition, it minimizes the content of silver nanoparticles, so it is harmless to the human body and has excellent antibacterial properties.

In addition, the thermoelectric element 100 of FIG. 5 and the polypyrrole layer 600 bonded to one surface thereof may have sterilizing activity as shown in FIG. 2.

As described above, the air purifier according to the present invention of FIGS. 2 and 4 to 5 is sterilized active layer 300 by a wind discharge means 200 and a piezoelectric element 100 generating electric energy by the wind discharge means 200. ) Is activated, so it has excellent removal efficiency of fungi, bacteria, and viruses. Specifically, the air purifier according to the present invention can remove 74 to 95% of bacteria.

In addition, the air purifiers according to FIGS. 2 and 4 to 5 of the present invention have excellent removal efficiency of fine particles such as dust, and can specifically remove particles having a size of 2.5 to 10 μm by 90% or more.

Hereinafter, preferred embodiments are provided to help the understanding of the present invention, but the following examples are merely illustrative of the present invention, and it is apparent to those skilled in the art that various changes and modifications are possible within the scope and technical scope of the present invention. It is also natural that such modifications and variations fall within the scope of the appended claims.

silver( Ag ) Containing sterilizing active layer

< Manufacturing example  1. Preparation of coating solution>

By pulverizing 5 g of pure silver (Ag) having a silver content of 99.9% or higher in purity to a nano size (5-10 nm), fine particles are formed, and the produced silver fine particles are dissolved in 1 L of ammonia water, followed by acid treatment to dissolve. A silver colloidal solution was prepared. At this time, the silver colloidal solution was prepared to contain 0.05% of silver nanoparticles.

< Manufacturing example  2. Film production>

Calcium carbonate (Samjin Polytech Co.) 50% was mixed with a commercially available polyolefin resin (LGPE LLDPE ST408 30%, LDPE BB150 20%). Then, a T-die extrusion was performed in a film extruder under extrusion conditions of 230 ° C, 10 rpm, and 25 bar to obtain a breathable film. The coating liquid of Preparation Example 1 was coated on the surface of the breathable film to a thickness of 300 Å through a dip coating method, and dried at 90 ° C. for 1 hour to prepare a film containing silver nanoparticles.

Sterilization active layer containing copper

< Manufacturing example  3. Preparation of coating solution>

After measuring 38.01 g of copper nitrate (Cu (NO ₃ ) ₂ · H ₂ O (Dongyang Steel Chemical Co., Ltd.) and transferring it to a 1L beaker, distilled water was added and stirred slowly to completely dissolve the copper nitrate. In order to measure the hydrazine hydrate (N ₂ H ₂ H ₂ O) of 1 mol or more as a reducing agent in 1 mol of copper nitrate in another container, the copper powder was added dropwise while stirring the solution in which copper nitrate was dissolved at a rate of 1,000 rpm. To remove the excess dropwise hydrazine hydrate and by-products, filtration and washing were carried out 5 times, followed by complete drying to obtain 10 g of copper powder having an average size of 0.1 nm 0.025 g of the obtained copper powder To 50 ml of distilled water, 0.5 g of polyvinyl alcohol was added and then dissolved to prepare a solution containing copper.

At this time, the copper nano solution was prepared so that the copper nanoparticles contained 0.05%.

< Manufacturing example  4. Film Manufacturing>

A film containing copper nanoparticles was prepared in the same manner as in Preparation Example 2, using the coating solution of Preparation Example 3.

Air purifier Sterilization  Produce

< Example  1>

Mayer bar No. 1 on one side of a piezoelectric element (Sensonic) made of polyvinylidene fluoride (PVDF) containing a coating solution containing 0.05% of silver (Ag) nanoparticles prepared in Preparation Example 1 above. It was coated uniformly using 20 to form a sterilizing active layer. The piezoelectric element on which the sterilizing active layer was formed was dried at 100 ° C. for 10 minutes, and a mesh-type filter (70 trees) made of polyester was used as a filtering member on the sterilizing active layer. Then, after attaching a blower (LG Innotek, TB-150) to the other side of the piezoelectric element, 15 CFM was added to measure the output voltage, antibacterial activity, and removal efficiency of fine particles.

< Example  2>

The same procedure as in Example 1 was performed, but a polymer cover layer made of polyetherimide (PEI) was further formed between the piezoelectric element and the sterilizing active layer to prepare a sterilizing filter. At this time, the polymer cover layer was prepared by applying a thickness of 10 nm to one surface of the piezoelectric element and then putting it in a drying furnace at 80 ° C. for 10 minutes.

< Example  3>

The same procedure as in Example 1 was carried out, but a polymer cover layer made of polypyrrole was further formed between the piezoelectric element and the sterilizing active layer to prepare a sterilizing device. At this time, the polypyrrole layer was prepared by applying a thickness of 10 nm on one surface of the piezoelectric element and then putting it in a drying furnace at 80 ° C. for 10 minutes.

< Example  4>

It was carried out in the same manner as in Example 1, using a solution containing 0.05% of the copper nanoparticles prepared in Preparation Example 3 to prepare a sterilizing portion of the air purifier according to the present invention.

< Example  5>

It was carried out in the same manner as in Example 2, using a solution containing 0.05% of the copper nanoparticles prepared in Preparation Example 3 to prepare a sterilizing portion of the air purifier according to the present invention.

< Example  6>

It was carried out in the same manner as in Example 3, using a solution containing 0.05% of the copper nanoparticles prepared in Preparation Example 3 to prepare a sterilizing portion of the air purifier according to the present invention.

< Example  7>

It was carried out in the same manner as in Example 1, using Preparation Example 2 (film containing 0.05% of silver nanoparticles) instead of Preparation Example 1 to prepare a sterilizing portion of the air purifier according to the present invention. The film prepared in Preparation Example 2 was bonded to a piezoelectric element using an adhesive made of an acrylic copolymer (AKITACK product, AK Chemtech Co., Ltd.).

< Example  8>

It was carried out in the same manner as in Example 1, using Preparation Example 4 (film containing 0.05% copper nanoparticles) instead of Preparation Example 3 to prepare a sterilizing portion of the air purifier according to the present invention. The film prepared in Preparation Example 4 was bonded to a piezoelectric element using an adhesive made of an acrylic copolymer (AKITACK product, AK Chemtech Co., Ltd.).

< Example  9>

The same procedure as in Example 1 was performed, but 10 CFM of wind was applied to the piezoelectric element.

< Example  10>

The same procedure as in Example 1 was performed, but 50 CFM of wind was applied to the piezoelectric element.

< Comparative example  1>

It was carried out in the same manner as in Example 1, but was prepared using Preparation Example 2 (a film containing 0.05% of silver nanoparticles) without a piezoelectric element.

< Comparative example  2>

The same procedure as in Example 2 was performed, but a piezoelectric element was not provided, and a sterilizing portion of the air purifier was manufactured.

< Comparative example  3>

It was carried out in the same manner as in Example 1, was prepared using a coating solution containing 0.008% silver (Ag) nanoparticles.

< Comparative example  4>

It was carried out in the same manner as in Example 1, but was prepared using a coating solution containing 1% of silver (Ag) nanoparticles.

< Experimental example >

The air purifiers according to the above Examples and Comparative Examples were used to evaluate antibacterial performance and microparticle removal efficiency.

1. Antibacterial evaluation

For the microbial experiment for the evaluation of antibacterial properties, a suitable medium was prepared and only the microorganism suitable for the purpose of the experiment was purely cultured. In addition, all reagents, vitreous materials, etc. were autoclaved at 121 ° C for 15 minutes, or filtered and sterilized using a filter (pore size 0.2 to 0.45 µm).

As an indicator microorganism for evaluating antibacterial activity, antibacterial activity was tested against Escherichia coli (ATCC 15597). The strain is cultured in a shaking incubator at a rate of 150 to 200 rpm at 37 ° C., and then 0.3 ml is plated on a petri dish (150 mm) containing solid medium (trypticase soy agar, 29 ml), 37 Cultured at 12 ℃ for 18 to 18 hours (overnight).

Put the specimen of the filter according to the present invention in a petri dish inoculated with the strain, a size of 10 × 10 × 1 mm, incubate at 25 ° C. for 50 minutes, count colonies according to Equation 1 below, According to 2, the antibacterial property (%) was evaluated. Table 2 shows the results.

[Equation 1]

N: colony forming unit per milliliter (CFU / ml)

CFU: Total colonies in Petri dishes

α: Bacterial injection amount (ml)

d _i : dilution factor

[Equation 2]

(%) IE: Deactivation efficiency

N _treated : colony forming unit per milliliter of sample with piezoelectric element

N _control : Control (sample without piezoelectric element)

division After 50 minutes
(CFU / ml) Control Control
Rate of bacteria reduction (%) Example 1 2.17 Comparative Example 1 74 Example 2 1.16 Comparative Example 1 86 Example 3 0.42 Comparative Example 1 95 Example 4 5.01 Comparative Example 2 80 Example 5 3.80 Comparative Example 2 85 Example 6 2.39 Comparative Example 2 90 Example 7 1.75 Comparative Example 1 79 Example 8 4.03 Comparative Example 2 84 Example 9 7.33 Comparative Example 1 12 Example 10 2.49 Comparative Example 1 70 Comparative Example 1 8.32 Comparative Example 1 0 Comparative Example 2 25.2 Comparative Example 2 0 Comparative Example 3 7.48 Comparative Example 1 10 Comparative Example 4 6.24 Comparative Example 1 25

As shown in Table 1, in Examples 1 to 3, it can be seen that the removal rate of bacteria was 70% or more by the piezoelectric element generating an output voltage of 200 mV or more compared to Comparative Example 1, and in particular, as the polypyrrole of Example 3 It can be seen that the sterilization device including the polymer cover layer is made to remove bacteria by 95%.

On the other hand, the output voltages generated in Comparative Examples 3 and 4 were similar to those of Examples 1 to 3, but the silver content was low, indicating that the antibacterial activity was hardly measured.

In addition, through Examples 4 to 6, it can be seen that the sterilizing apparatus using the sterilizing active layer containing copper nanoparticles showed a bacteria removal rate of 90% compared to Comparative Example 2.

In addition, through Examples 7 and 8, it was found that the antibacterial activity was equal to or greater than that of Examples 1 to 6 in the sterilizing device formed by bonding the sterilizing active layer containing silver or copper nanoparticles to the piezoelectric element in the form of a film.

As a result of measuring the antibacterial activity according to the magnitude of the force applied to the piezoelectric element, as can be seen from Examples 9 and 10, when the wind was applied to the piezoelectric element at a flow rate of 10 CFM, the output voltage was low and the antibacterial effect was hardly exhibited. . In addition, it showed a high output voltage when the wind was applied to the piezoelectric element at a flow rate of 30 CFM, but showed little difference in antibacterial effect.

2. Fine dust removal efficiency

Performance evaluation of removal efficiency by particle size was conducted in accordance with DIN71460, a German combination cycle test method, and the results are shown in Table 2. As an evaluation condition, the concentration of fine dust was maintained at 20 mg / m ³ .

division Removal efficiency by particle size (%) Particle size (㎛) 1.0 ~ 3.0 3.0 ~ 5.0 5.0 ~ 10.0 Example 1 91 94 96.9 Example 2 92.4 95.5 97 Example 3 94.5 97.4 99.5 Example 4 92 93.1 96.1 Example 5 92.5 94.2 97.5 Example 6 92 94 97 Example 7 92 95 97 Example 8 92 93.5 95.5 Example 9 85.1 88.7 92 Example 10 80.6 84.2 90.9 Comparative Example 1 88 89.1 90.1 Comparative Example 2 87 89 90 Comparative Example 3 88.2 89.3 91.2 Comparative Example 4 89.9 90.0 91

In addition, as shown in Table 2, it was confirmed that the sterilizing filters of Examples 1 to 10 exhibited filtering efficiencies of about 90% or more at particle sizes of 1.0 to 3.0 μm, 3.0 to 5.0 μm, and 5.0 to 10.0 μm. Based on the test results, it was confirmed that the sterilizing filter according to the present invention has excellent characteristics of filtering fine dust.

The above description of the present invention is for illustration only, and those skilled in the art to which the present invention pertains can understand that it can be easily modified to other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and it should be interpreted that all changes or modified forms derived from the meaning and scope of the claims and equivalent concepts thereof are included in the scope of the present invention. do.

100: piezoelectric element
200: wind emission means
300: sterilizing active layer
400: filtration member
500: polymer cover layer
600: polypyrrole layer

Claims (13)

In the air purifier including an air inlet, a purification unit for purifying the air introduced into the inlet, an outlet for discharging the purified air from the purification unit, and a blower fan for introducing air into the purification unit through the inlet,
The purifying part is a piezoelectric element capable of generating an output voltage of 100 mV or more by a pressure change;
Wind discharge means that can change the pressure of the piezoelectric element by emitting wind to one side of the piezoelectric element;
A sterilization active layer that is bonded to the other side of the piezoelectric element and has a sterilizing function activated by a current generated in the piezoelectric element; And
The air purifier, characterized in that formed on the sterilizing active layer comprises a filtering member capable of filtering a predetermined particle.
The air purifier according to claim 1, wherein a polymer cover layer is further formed between the piezoelectric element and the sterilizing active layer.
The air purifier according to claim 2, wherein the polymer cover layer is made of a conductive polymer.
The method according to claim 3, The conductive polymer is polyethylene terephthalide (PET), polyethylene naphthalate (PEN), polyimide (PI), polyether sulfone (PES), polyacrylate (PAR), polyether imide (PEI) , Polyphenylene sulfide (PPS), polyarylate, polycarbonate (PC), cyclo olefin polymer (COP), cyclo olefin copolymer (COC), cellulose triacetate (CTA), cellulose acetate propionate ( CAP), an air purifier, characterized in that at least one selected from the group consisting of norbornene-based resins and combinations thereof.
The air purifier according to claim 4, wherein the cyclo olefin polymer is a heterocyclic compound.
The air purifier according to claim 5, wherein the heterocyclic compound is polypyrrole.
The air purifier according to claim 1, wherein the piezoelectric element generates an output voltage of 100 to 400 mV.
The method according to claim 1, wherein the piezoelectric element is composed of a crystal, Rochelle salt (Rachelle salt), barium titanate (BaTiO ₃ ), ammonium dihydrogen phosphate, ethylene diamine tartrate crystal, PZT and polyvinylidene fluoride (PVDF) An air purifier comprising one or more materials selected from the group.
The air purifier according to claim 1, wherein the predetermined particles have a size of 2.5 to 10 μm.
The method according to claim 1, The filtration member is made of one or more materials selected from the group consisting of polynylon, polyamide, polyphenylene sulfide (PPS), polyester, polypropylene (PP) and polyterafluoroethylene (PTFE) Air purifier characterized in that made.
The air purifier according to claim 1, wherein the sterilizing active layer is a layer containing 0.01 to 0.1% of nanoparticles of silver, copper, or a mixed metal thereof.
The air purifier according to claim 1, wherein the sterilizing active layer is a coating layer or a film layer.
The air purifier according to claim 1, wherein the sterilizing filter removes 74 to 95% of bacteria.

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