JP2014023814A - Porous filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an inexpensive porous filter for air cleaners exploiting high antibacterial and deodorant aptitudes of platinum nanoparticles.SOLUTION: An aqueous platinum nanoparticle solution is prepared by diluting an undiluted stock of the aqueous platinum nanoparticle solution including platinum nanoparticles dissolved into 1 L of water by using additional water of volume equivalents confined to a range culminating in a specified multiplying power (e.g., multiplying power of 1500 equivalents). A porous filter 3 is preliminarily impregnated, etc. with this diluted aqueous platinum nanoparticle solution, and the porous filter 3 having absorbed the aqueous platinum nanoparticle solution is then dried. The sheet-shaped porous filter 3 possesses, in the interior thereof, many through-holes constituting air paths of several μm meandering zigzag upward, downward, leftward, and rightward. The flow of air AA collides with the anterior plane of the filter 3 and passes through the paths of the respective through-holes therein. Many platinum nanoparticles having high antibacterial and deodorant aptitudes exist within these paths.

Description

The present invention relates to various products (application products: for example, in-hospital air purifiers) using an aqueous solution containing platinum nanoparticles (hereinafter referred to as “platinum nanoparticle aqueous solution”) that exhibits extremely high antibacterial and deodorant performance. The present invention relates to a porous filter applied.

A so-called “HEPA filter” called a “high performance air filter” is employed as a filter of a conventional air cleaner sold in the market.

US Pat. No. 6,239,064

The HEPA filter is a filter formed by bending a single material into a zigzag, and therefore has a jagged surface like a bellows. And the HEPA filter collects harmful microbes such as fine particles or bacteria contained in the air passing through the HEPA filter due to the surface shape.

However, the bacteria and the like collected on the jagged surface portion of the HEPA filter propagate or multiply in the HEPA filter over time. As a result, harmful bacteria such as bacteria or malodorous particles are filled in the HEPA filter.

For this reason, when replacing the HEPA filter for business use, the HEPA filter is filled with a number of harmful bacteria such as bacteria and is alive. As a person, the HEPA filter is exchanged. In particular, in hospitals that pay attention to the generation of germs that are harmful to the human body, such as bacteria that cause nosocomial infections, care must be taken when handling air purifiers that use HEPA filters. Has a good management system.

Therefore, there is a need for a low-cost air purifier that does not require such great care and control and that has high antibacterial and deodorizing properties.

<Main object of the present invention>
The present invention has been made based on the above-mentioned recognition of the current situation.

Its main purpose is to reliably collect unpleasant odor sources (particles), such as house dust and pollen, without breeding and multiplying odor sources (particles) such as bad odors in the indoor air. An object is to realize an air cleaner that deodorizes and has a reliable antibacterial performance against bacteria (for example, bacteria) harmful to the human body contained in the air without using a HEPA filter.

That is, instead of the conventional air purifier where bacteria etc. fill up and grow inside the HEPA filter during use, it is necessary to pay strict attention to harmful bacteria such as bacteria when replacing the filter. The main object of the present invention is to provide an air purifier at low cost, which is not necessary and does not require a management system as an infection prevention measure. The present invention provides application of a “porous filter” that has been researched and developed in the realization of such an invention product (air purifier).

The porous filter according to the subject of the present invention is a micro-size comprising a front surface that receives a flow of inhaled air, a rear surface that faces the front surface, and a passage of air that is bent zigzag from the front surface to the rear surface. A plurality of through holes.

According to the subject matter of the present invention, by applying a platinum nanoparticle aqueous solution and a porous filter, which still have high antibacterial and deodorant performance and are reduced in cost to a practical level, Compared with products such as the above, it is possible to put to practical use a low-cost air purifier that can exhibit high antibacterial performance and high deodorization performance, and in that case the "porous filter" demonstrates its power

  Hereinafter, various embodiments of the present invention will be described in detail along with the effects and advantages thereof with reference to the accompanying drawings.

It is a figure which shows typically the process of diluting the stock solution of platinum nanoparticle aqueous solution with water (purified water etc.). It is a figure which shows typically the structure of the air cleaner to which the platinum nanoparticle aqueous solution which concerns on Embodiment 1 is applied. FIG. 3 is an enlarged longitudinal sectional view showing a part of the internal structure of a porous filter in the air purifier exemplified in FIG. 2.

  (Embodiment 1)

  <Development of low-priced platinum nanoparticle aqueous solution (also called “platinum aqueous solution”) using a stock solution of platinum nanoparticle aqueous solution>

  Nano-sized platinum particles (hereinafter referred to as “platinum nanoparticles”) are noble metal particles that exhibit antibacterial, antiviral, and deodorant performance with extremely high killing ability. There is a demand for the realization of an inexpensive platinum nanoparticle aqueous solution in which platinum nanoparticles are dissolved in water that can exhibit the antibacterial and antiviral properties of the platinum nanoparticles.

  An aqueous solution (platinum nano-particles) containing platinum nanoparticles dissolved in 1 liter of water (eg, purified water or pure water) that can continuously exhibit the above-mentioned extremely high antibacterial and deodorant performance over a long period of time. (Particle aqueous solution) is a commodity available from the trading market. The fact that such an aqueous solution of platinum nanoparticles dissolved in 1 liter of water exhibits almost perfect "antibacterial performance" and "deodorization performance" is based on strict measurement results in a reliable test and measurement organization. This is a well-known fact that has already been proven. Hereinafter, the “platinum nanoparticle aqueous solution” in which the platinum nanoparticle powder is dissolved in 1 liter of purified water or the like is referred to as “platinum nanoparticle aqueous solution”.

“Platinum aqueous solution of platinum nanoparticles” that can be purchased from the above market exhibits antibacterial properties against bacteria such as Escherichia coli, and against various viruses such as Norovirus, avian influenza virus, Thirds virus or AIDS virus. Test results demonstrate that it also exhibits antiviral properties. In addition, as described above, it has been proved by tests that the stock solution of the present platinum nanoparticle aqueous solution can also exhibit extremely high deodorizing properties against ammonia and the like.

However, in order to use the “stock solution of platinum nanoparticle aqueous solution” as it is and realize “use products” as various inventions, platinum is a rare noble metal and is therefore expensive. There is a drawback that the cost of the stock solution of the particle aqueous solution increases.

  Therefore, as schematically shown in FIG. 1, the inventor of the present application further added the above-described stock solution OPL of an aqueous solution of platinum nanoparticles obtained by dissolving platinum nanoparticles with 1 liter of water (purified water or pure water). Dilution formed by dissolving platinum nanoparticles with x (x> 1) liters of water by adding water HL to further dilute the stock solution OPL and further reduce the concentration value of platinum dissolved in the aqueous solution. A platinum nanoparticle aqueous solution PSL was prepared. The antibacterial and deodorant properties of the platinum nanoparticle aqueous solution PSL diluted x times with respect to the stock solution OPL can be set to any value of x to dilute the stock solution OPL regardless of the passage of time. It was tested whether it was still kept afterwards.

  Tables 1 and 2 below show the results of the antibacterial test of the platinum nanoparticle aqueous solution PSL having a value of x of 400, that is, diluted with water 400 times that of the stock solution OPL.

  The antibacterial test is a test conducted by the present inventor submitting the platinum nanoparticle aqueous solution PSL to the “General Boken Quality Evaluation Organization” and entrusting the antibacterial test. And the test method applies JIS1902: 2008 quantitative test (bacterial liquid absorption method) mutatis mutandis, and the measuring method of the number of viable bacteria depends on the pour plate culture method. In addition, the test method in each antibacterial test and the method for measuring the number of viable bacteria are the same as described above. The test strain in the antibacterial test shown in Table 1 and Table 2 is MRSA (methicillin resistant Staphylococcus aureus) known as a nosocomial pathogen.

  As shown in Table 1, on the standard cotton fabric to be compared in the test, MRSA bacteria grew as indicated by the growth value 2.6 after 18 hours from the inoculation. Yes. On the other hand, Table 2 shows that 0.4 g of the platinum nanoparticle aqueous solution collected from the platinum nanoparticle aqueous solution PSL diluted 400 times with respect to the stock solution OPL is immersed in the cotton cloth to be tested. Fig. 2 shows a measurement result when 0.2 ml of MRSA bacterial solution was inoculated on the cotton cloth.

As shown in the results of Table 2, the common logarithm of the number of MRSA inhabiting on cotton cloth 18 hours after the inoculation of MRSA is 1.3 or less, which is compared with the case of Table 1. And it is confirmed that the number of viable bacteria is decreasing at each stage. According to the criteria defined in the JIS standard, the “bacteriostatic activity value” displayed in Table 2 is used to determine whether the liquid sample to be tested has “antibacterial” properties. If the “bacteriostatic activity value” is 2.0 or more, it is judged to be “passing antibacterial”. In the test of Table 2, the “bacteriostatic activity value” is a value of 5.7 or more, far exceeding 2.0, which is a threshold for determination of acceptance.

Therefore, even if the platinum nanoparticle aqueous solution PSL having a dilution of 400 times adopted by the inventor as a value x times that in FIG. 1 is used, the platinum nanoparticle aqueous solution PSL is sufficiently antibacterial against MRSA bacteria. It is demonstrated from the test results that the

This is feasible because the aqueous solution of platinum nanoparticles PSL diluted at a 400-fold dilution with respect to the stock solution OPL eliminates MRSA, known as the cause of nosocomial infection, in the hospital. It can be applied as a low-cost antibacterial agent.

  In addition, the inventor of the present application is that the platinum nanoparticle aqueous solution PSL diluted with the 400-fold dilution described above is “antibacterial” against “Staphylococcus aureus” with respect to the “General Boken Quality Evaluation Organization”. The test of whether or not it has the performance (antibacterial performance). The test results are the results shown in Table 3 and Table 4 below. As is known, “Staphylococcus aureus” is a causative bacterium of epidermic infection or food poisoning, or an infectious disease such as pneumonia, meningitis, and sepsis.

In the antibacterial test, as in the case of the antibacterial test of Tables 1 and 2, 0.4 g of platinum nanoparticle aqueous solution was collected from the platinum nanoparticle aqueous solution PSL, and the volume of 0.2 ml was reduced. The bacterial solution of “Staphylococcus aureus” is inoculated on the cotton cloth to be tested.

Referring to the test results in Table 4 in comparison with the results in Table 3, as a clear result, the platinum nanoparticle aqueous solution PSL diluted with 400 times water is still in “Staphylococcus aureus”. It is understood to have “antibacterial”. In Table 4, as in Table 2, the “bacteriostatic activity value” is 5.9 or more, and the “antibacterial activity” of the platinum nanoparticle aqueous solution PSL diluted with 400 times water is sufficient. Is determined to pass.

Furthermore, the inventor of the present application has also described that the platinum nanoparticle aqueous solution PSL diluted at 400 times the above-mentioned “Boken Quality Evaluation Organization” is also suitable for “Klebsiella pneumoniae”. The test of whether or not it has “antibacterial” was commissioned. The test results are the results shown in Table 5 and Table 6 below. As is known, “Klebsiella pneumoniae” is an attenuated bacterium that causes respiratory infections, urinary tract infections, and the like.

In the antibacterial test, as in the case of the antibacterial test of Tables 1 and 2, 0.4 g of platinum nanoparticle aqueous solution was collected from the platinum nanoparticle aqueous solution PSL, and the volume of 0.2 ml was reduced. The bacterial solution of “Klebsiella pneumoniae” is inoculated on the cotton cloth to be tested.

If the test results in Table 6 are referred to in comparison with the results in Table 5, the common logarithm of the number of viable bacteria after 18 hours is markedly reduced to 1.3 or less, and “bacteriostatic activity value” As for "", a value that is 6.4 or higher and sufficiently high to make a pass determination is detected. Therefore, it is understood that the platinum nanoparticle aqueous solution PSL diluted with the 400-fold dilution described above has sufficient “antibacterial properties” against “Klebsiella pneumoniae”.

The platinum nanoparticle aqueous solution PSL diluted at a dilution of 400 times can exhibit relatively high deodorizing performance against particles that are a source of malodor such as ammonia, acetic acid, or isovaleric acid.

  According to each test result described above, when the dilution of the platinum nanoparticle aqueous solution with water (purified water, pure, etc.) is 400 times, the “bacteriostatic activity value” is less than the threshold value 2.0 for the pass judgment The platinum nanoparticle aqueous solution that is sufficiently high and diluted at a dilution of 400 times still has high “antibacterial performance”. Moreover, the platinum nanoparticle aqueous solution diluted with 400 times water (purified water, pure, etc.) also exhibits sufficiently high “deodorizing performance”.

If so, the platinum nanoparticle aqueous solution diluted 400 times with respect to the original solution of the platinum nanoparticle aqueous solution in which the platinum nanoparticles are dissolved in 1 liter of water has a relatively high antibacterial property. I can say that. Or it is thought that the platinum nanoparticle aqueous solution diluted by the dilution within the range within 400 times (for example, 200 times, 300 times) has relatively high “antibacterial properties”. Moreover, it is thought that the platinum nanoparticle aqueous solution diluted with the dilution within the range of 400 times or more also has “deodorizing performance”.

  Here, Table 7 below shows the platinum nanoparticle aqueous solution PSL diluted and diluted by 400 times the stock solution OPL of the platinum nanoparticle aqueous solution developed and put into practical use by the present inventors, and products of various companies. It is a test result which shows the comparison result of antibacterial performance. The strain used for the test is Staphylococcus aureus, and the method of the antibacterial test is the same as the test method described in Tables 1 and 2. The common logarithm of the number of viable bacteria on the standard cotton cloth is 4.4 immediately after inoculation with the test strain, 7.2 after 18 hours, and the growth value is 2.8. is there. The comparative test was also commissioned to the “General Boken Quality Evaluation Organization”.

  In Table 7, sample (1) is a fine particle ion generated from moisture in the air, developed by Company A, and is one sterilization method in an air cleaner (releases fine ions in the air. And a method for decomposing and removing airborne viruses.) Sample (2) is an ion developed by company B and, like sample (1), is applied to the ion used in the sterilization method in the air cleaner. Sample (3) is a product for a deodorizer from Company C. Sample (4) is a dough naturally dried after being immersed in the diluted platinum nanoparticle aqueous solution developed by the inventors of the present application.

  As shown in Table 7, the values of the “bacteriostatic activity value” of each of the samples (1), (2) and (3) are 0.3, 0.3 and 0.2, which are low values across the board. On the other hand, the “bacteriostatic activity value” of the sample (4) is 5.0, which is a prominent high value compared to the values of the other samples (1), (2) and (3). ing.

As is apparent from the results of this comparative test, it is understood that the platinum nanoparticle aqueous solution PSL diluted at a dilution of 400 times the stock solution OPL has extremely high antibacterial performance. Moreover, the platinum nanoparticle aqueous solution PSL is an aqueous solution obtained by diluting a stock solution OPL obtained by dissolving platinum, which is nano-sized particles, with 1 liter of water with 400 times the volume of water. The point that the cost can be reduced while maintaining the same level of antibacterial performance is extremely large and useful from the viewpoint of practical use.

The “bactericidal activity value” and “bacteriostatic activity value” shown in the above Tables 2, 4, 6, and 7 are calculated by the following equations. That is, “bactericidal activity value” = Ma−Mc, “bacteriostatic activity value” = (Mb−Ma) − (Mc−Mo). Here, Ma is the common logarithm of the number of viable bacteria immediately after inoculation of the test strain on the standard cotton cloth, and Mb is the viable bacteria after 18 hours have passed since the inoculation of the test strain on the standard cotton cloth. It is the common logarithm of numbers. In contrast, Mo is a common logarithm of the number of viable bacteria immediately after inoculation of the test strain to the test sample, and Mc is 18 hours after the inoculation of the test strain to the test sample. It is a common logarithm of the number of viable bacteria. This also applies to Table 10 described later.

Furthermore, in order to reduce the cost of a single layer of platinum nanoparticle aqueous solution, the present inventor diluted the value of x to 800 times that is twice 400, that is, diluted with water 800 times that of the stock solution OPL. The platinum nanoparticle aqueous solution PSL thus prepared was prepared and tested for its respiration. The said breathability test was also consigned to the “General Boken Quality Evaluation Organization”. The test results are shown in Table 8 below.

  The test method and conditions in this respiration performance test are based on the application of the renewal processed fiber product certification standard of the Fiber Evaluation Technology Council. Regarding the initial gas concentration in the present performance test, ammonia is 1000 ppm (10 ml), acetic acid is 50 ppm (10 ml), and isovaleric acid is about 38 ppm (10 ml). The measurement time is 2 hours after the start of the test. In addition, the result whose deodorizing effect reduction rate is 75% or more is a pass result.

  When Table 8 is taken into consideration, the reduction rates of ammonia, acetic acid, and isovaleric acid are reported to be 87%, 98%, and 99% or more, respectively. From such a result, the platinum nanoparticle aqueous solution PSL diluted with 800 times the water of the stock solution OPL still maintains a sufficient “dissipative performance” that cannot be inferior to the stock solution OPL. confirmed.

Further, the inventor of the present application has developed a platinum nanoparticle which is diluted with water having a value x of 1500 times, that is, 1500 times that of the stock solution OPL, in order to further reduce the cost of the platinum nanoparticle aqueous solution. An aqueous solution PSL was prepared and the antibacterial performance test was conducted. The antibacterial performance test was also commissioned to the “Boken Quality Evaluation Organization”. The test results are shown in Table 9 and Table 10 below.

The antibacterial performance test is a test of whether or not the platinum nanoparticle aqueous solution PSL formed by diluting 1500 times the stock solution OPL exhibits “antibacterial activity” against “S. aureus”. As in the case of the antibacterial test of Table 2, 0.4 g of platinum nanoparticle aqueous solution was collected from the above platinum nanoparticle aqueous solution PSL, and 0.2 ml of “S. aureus” bacterial solution was tested. Inoculated on cotton cloth. If the test result of Table 9 is referred to in comparison with the result of Table 8, the common logarithm of the viable cell count after 18 hours is 1.3 or less, and it is markedly reduced as in Table 2. In addition, the “bacteriostatic activity value” is a result value of 5.9 or more, and this value is sufficiently high to make a pass determination of “antibacterial”. Therefore, it is understood that the platinum nanoparticle aqueous solution PSL diluted to a dilution of 1500 times still has sufficient “antibacterial performance” even against “S. aureus”.

Furthermore, the inventor of the present application also conducted an extinction test of an aqueous platinum nanoparticle solution PSL diluted with water 1500 times the stock solution OPL. The said breathability test was also consigned to the “General Boken Quality Evaluation Organization”. The test results are shown in Table 11 below.

  The test method and conditions in this respiration performance test are based on the application of the renewal processed fiber product certification standard of the Fiber Evaluation Technology Council. Regarding the initial gas concentration in the present performance test, ammonia is 1000 ppm (10 ml), acetic acid is 50 ppm (10 ml), and isovaleric acid is about 38 ppm (10 ml). The measurement time is 2 hours after the start of the test. As in the case of the 800-fold dilution, the result that the deodorizing effect reduction rate is 75% or more is a pass result.

  Taking Table 11 into consideration, the respective reduction rates of ammonia, acetic acid and isovaleric acid are reported to be 88%, 99% or more and 99% or more, respectively. From such a result, the platinum nanoparticle aqueous solution PSL diluted with 1500 times the volume of water with respect to the stock solution OPL also maintains a sufficient “dissipation performance” that is not inferior to the stock solution OPL. That was confirmed.

  According to each test result above, when the dilution of the platinum nanoparticle aqueous solution with water (purified water, pure, sterilized ion exchange water, etc.) is 400 times or 1500 times, the “bacteriostatic activity value” is The platinum nanoparticle aqueous solution that is sufficiently higher than the threshold value 2.0 for acceptance determination and diluted at a dilution of 400 times or 1500 times still has high “antibacterial performance”. Further, platinum nanoparticle aqueous solutions diluted with 800 times or 1500 times water (purified water, pure, sterilized ion-exchanged water, etc.) exhibit sufficiently high “dissipating performance”. If so, the platinum nanoparticle aqueous solution diluted 400 times, 800 times, or 1500 times relative to the stock solution of the platinum nanoparticle aqueous solution in which the platinum nanoparticles are dissolved in 1 liter of water, In other words, it can be said that it has high antibacterial properties and antiseptic performance. Alternatively, since it was confirmed that the platinum nanoparticle aqueous solution diluted at a dilution of 400 times and 1500 times has high “antibacterial performance”, it is diluted at a dilution within a range of up to 1500 times. It is considered that the prepared platinum nanoparticle aqueous solution has a relatively high “antibacterial property”. Further, from the same assumption, it is considered that the platinum nanoparticle aqueous solution diluted with a dilution within a range of up to 1500 times also has a relatively high “dissipation performance”.

  From the above, the inventor of the present application, from the “pure solution of platinum nanoparticle aqueous solution” having antibacterial properties, deodorant properties, and antiviral properties, from the level of practicality while still retaining various performances of the stock solution. As a result, it was possible to develop and realize a diluted platinum nanoparticle aqueous solution that can reduce costs at each stage.

(Embodiment 2)
<Application invention of porous filter and platinum nanoparticle aqueous solution: air purifier>

  FIG. 2 shows platinum nanoparticle diluted with water (purified water or the like) at a dilution of 400 times, 800 times, or 1500 times with respect to the stock solution OPL, or at a dilution within a range up to 1500 times. It is a figure which shows typically the core part in the air cleaner 1 at the time of applying particle aqueous solution PSL to the filter of an air cleaner. The core component is the configuration of the filter 3 through which inhaled air passes.

  In FIG. 2, the suction fan 2 sucks air outside the air cleaner 1, that is, indoor air AI into the air cleaner 1. The sucked air AA is from a sheet-like or cloth-like porous film relatively thin with respect to a conventional HEPA filter, which is stretched without being loosened by the support of both ends by the stoppers 3SA, 3SB. It passes through the filter 3 consisting of: The thickness of the sheet-like porous filter constituting the filter 3 is, for example, 0.5 mm. The air AB that has passed through the filter 3 is deodorized by the filter 3 and purified by receiving antibacterial action, and is sent from the air outlet 4 to the outside (indoor space) of the air cleaner 1. Indoor air AI or inhaled air AA contains animal odor molecules, pollen such as cedar or cypress, dust such as mites, house dust such as dust and dust, etc. Is not captured and discharged to the outside, and as a result, the unpleasant odor of the air AA passing through the filter 3 is eliminated.

  Both ends of the sheet-like porous filter constituting the filter 3 which is the core of the air cleaner 1 are supported by stoppers 3SA and 3SB. In the previous stage of attachment and support, the sheet-like porous filter is preliminarily formed of the platinum nanoparticle aqueous solution PSL according to Embodiment 1 (either 400 times, 800 times, or 1500 times the stock solution OPL). The platinum nanoparticle aqueous solution diluted with water at a dilution or with a dilution within a range of up to 1500 times (see FIG. 1) is impregnated. Alternatively, the entire surface of the sheet-like porous filter can be uniformly sprayed with the platinum nanoparticle aqueous solution PSL by a spray containing the platinum nanoparticle aqueous solution PSL. By this treatment, the relatively thin sheet-like filter 3 entirely contains the platinum nanoparticle aqueous solution PSL. The platinum nanoparticle aqueous solution PSL soaked in the entire sheet-like filter 3 is naturally or forcibly dried. Through this drying treatment, nano-sized platinum particles having extremely high antibacterial performance and deodorization performance are dispersed throughout the interior of the sheet-like filter 3.

  Moreover, the thin sheet-like filter 3 is a porous filter unlike the HEPA filter used in the conventional air cleaner. The unique internal structure of the sheet-like filter 3 is shown as an example in FIG. 3, which is an enlarged longitudinal sectional view of a pole portion 3P surrounded by a circle in FIG. That is, the filter 3 is continuously bent in the zigzag shape in the left-right direction or the up-down direction (in the illustration of FIG. 3, only the up-down zigzag structure is shown for the sake of convenience). As an air passage having a complicated shape that penetrates, it has a large number of through holes 3PH. More specifically, the sheet-like porous filter 3 includes (1) a front surface 3FS that receives a flow of air sucked opposite the suction fan 2, (2) a rear surface 3BS that faces the front surface 3FS, and (3 ) A plurality of (many) through-holes 3PH that are continuously bent in a zigzag shape in the left-right or up-down direction and form a complicated air passage or path from the front 3FS to the back 3BS. The size of the through hole 3PH is several μm. And in each through-hole 3PH, the platinum nanoparticle aqueous solution PSL soaked in the inside of the entire filter 3 is dried by natural drying or the like, so that a large number of platinum nanoparticles having a size of several nm are obtained. Are scattered.

  The sheet-like porous filter 3 having such a structure exhibits the following deodorizing / antibacterial action against the air AA that tries to pass through the filter 3. That is, the flow of the air AA that is given an acceleration and is pushed out toward the filter 3 by the suction action of the suction fan 6 flows into each through hole 3PH of the filter 3. The flow of the air AA flowing into each through hole 3PH passes through the continuously bent zigzag structure that is complicatedly bent by the through hole 3PH. In the process of passing through the air flow, the particles of unpleasant odor such as pollen, dust and house dust contained in the air AA adhere to the zigzag passage walls one after another. Because of the complicated and continuously bent zigzag structure, the unpleasant odor source particles taken into the passage wall are separated from the zigzag structure passage toward the outlet side of the through hole 3PH. You can't jump out. In addition, the numerous platinum nanoparticles described above are present in the passages of the respective through holes 3PH. For this reason, when the air AA flows through the passage of the zigzag structure, germs harmful to humans (for example, bacteria) contained in the air AA are the test results described in the first embodiment. As proved from the above, it is sterilized by the action of the antibacterial performance of the platinum nanoparticles. As a result, the air AB flowing out from the outlet on the back surface 3BS side of each through-hole 3PH of the sheet-like porous filter 3 contains almost no particles of the above-mentioned bad odor source and has platinum nanoparticles. Since the harmful bacteria are killed by the extremely high antibacterial performance, the air is sufficiently deodorized and sterilized. This clean air AB is blown out into the room through the outlet 4.

In the air cleaner 1, the flow of the air AA sucked into the air cleaner 1 must pass through the continuous zigzag structure passage of each through hole 3 </ b> PH of the porous filter 3. It will not be discharged from the back surface 3BS. Therefore, no harmful germs such as odor source particles or bacteria in the air are captured by the filter, and the situation where the air in the inhaled indoor space passes through the filter does not occur. Accordingly, air containing harmful odors such as malodorous particles and / or bacteria passes through the inside of the porous filter 3, resulting in the deodorization / antibacterial effect of harmful odorous particles and germs such as bacteria. Purified air that does not contain bacteria or the like is discharged from the air cleaner 1 into the indoor space.

In view of this action / effect, the air cleaner 1 is used as an air cleaner that can prevent the occurrence of infection of harmful bacteria such as bacteria in the hospital or indoors (in-hospital or indoor infection control supplies). )).

In addition, since the HEPA filter like the conventional air cleaner is not used as a filter in the present air cleaner 1, it is harmful to human bodies such as bacteria when replacing the porous filter 3 having high antibacterial performance. There is no need to take separate measures to prevent infection of fungi. This eliminates the need for a professional engineer / worker with complete protection to prevent infection to replace the filter for the air purifier.

  The air purifier 1 according to the present embodiment having both such high deodorizing performance and antibacterial performance at the same time is obtained by applying the diluted low-cost platinum nanoparticle aqueous solution PSL described in the first embodiment. Realized as a low-cost, high-performance air purifier against bacterial infections.

  Further, as described above, since the filter 3 is an extremely thin sheet, there is no need to increase the acceleration of the air flow AA sent to the filter 3 by the suction fan 2 as compared with the conventional product. As a result, the amount of air sent out by the suction fan 3 can be relatively reduced. As a result, the power consumption is reduced, and an energy saving effect that is friendly to the environment of the earth can be obtained at the same time.

(Modification)
In mid-to-high-rise buildings, in order to send fresh air to the air conditioners placed on the roof for ventilation, air is sucked with a fan installed in the basement and sent through dust. However, due to relatively long-term use, dust such as dust sucks and remains in the dust, causing air pollution. Alternatively, when bacteria harmful to the human body are sucked into the dust and multiply, contamination of the air sucked into the fan becomes a serious problem.

  Therefore, the air purifier illustrated in FIG. 2 provided with the porous filter having the structure shown in FIG. 3 is provided on the rear stage side of the fan. This application solves the above problems all at once.

(Appendix)
In an embodiment of the present invention, a platinum nanoparticle aqueous solution obtained by diluting a stock solution of a platinum nanoparticle aqueous solution in which platinum nanoparticles are dissolved in water with water has the unique shape of the air cleaner. An example of the cleaning device applied to the porous filter has been described.

However, in place of platinum, an invention product for use as an air cleaner having a porous filter as described above using an aqueous solution obtained by further dissolving a stock solution of metal nanoparticles such as gold, silver, or palladium with water. Can also be realized.

  While the embodiments of the present invention have been disclosed and described in detail above, the above description exemplifies aspects to which the present invention can be applied, and the present invention is not limited thereto. That is, various modifications and / or variations on the described aspects can be considered without departing from the scope of the invention.

  This invention relates to a “porous filter” used in an application product (invention product) to which an aqueous solution of platinum nanoparticles obtained by diluting a stock solution having extremely high antibacterial and deodorizing performance with water is applied. It is a preferable invention.

OPL Stock solution of platinum nanoparticle aqueous solution HL Water PSL such as purified water Platinum nanoparticle aqueous solution diluted x 1 Air cleaner 2 Suction fan 3 Porous filter 3PH Zigzag through-hole

Claims (3)

The front receiving the flow of inhaled air,
A back surface facing the front surface;
A sheet-like porous filter comprising a plurality of micro-sized through-holes that form air passages that are bent in a zigzag from the front to the back. The porous filter according to claim 1,
The porous filter is a platinum obtained by diluting a stock solution of an aqueous platinum nanoparticle solution containing platinum nanoparticles having a nano particle size dissolved in 1 liter of water with a volume of water within a range up to a predetermined magnification. A porous filter comprising an aqueous nanoparticle solution, wherein the aqueous platinum nanoparticle solution contained in the porous filter is dried. The porous filter according to claim 2,
The predetermined magnification is any one of 400 times, 800 times, and 1500 times.

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