JP2021138677A - Article that can prevent bacteria and viruses from entering house and automobile with two functions, high-antibacterial and antiviral, by using generally called filter such as home air conditioner filter and automobile air conditioner filter to which part highly antibacterial phosphor bronze alloy pulverized product 10 to 20 micron meter size product is applied - Google Patents

Abstract

To provide an article in which a pulverized phosphor bronze alloy is applied to the surface of a filter, that shows an amplified antibacterial property, and in which the copper powder supported on the surface does not peel off from the surface under any circumstances.SOLUTION: Provided is an article in which a phosphor bronze alloy pulverized product containing tin by 1.05 wt.% and phosphor by 0.09 wt.% and the balance being copper and unavoidable impurities, and having a highly antibacterial property is applied to filter surface with a spray gun or the like.SELECTED DRAWING: None

Description

The present invention is based on the water atomization method for a phosphor bronze alloy thin film plate-like product exhibiting high antibacterial properties, and in the process of examining whether or not the antibacterial properties are amplified when it is made into a powdered product, powder. In a confirmation test in which the state product can be uniformly applied to the filter surface of a household air conditioner filter and an automobile air conditioner filter to maintain or amplify the antibacterial effect in the same manner as a thin film plate product, in a mixed solution of an aqueous solution and a binder. The antibacterial property of the surface of the filter, which was uniformly supported on the filter part with a spray gun after stirring, was measured by the halo method. Was done.
However, on the contrary, the pressure loss, which is a necessary function of the filter, may be caused by (1) the alloy powder supported on the surface blocking the vent and causing a large pressure loss (2) depending on the wind pressure. Questions have been raised about whether the surface-supported copper powder may come off.
In response to the above two questions, this product has been examined and verified to prove that there is no such fact. We are also conducting pressure loss tests with actual filters and alternative experiments with harsh surface peeling experiments using mask gauze as a substitute for filters.

It has been conventionally known that some metals such as copper, silver and tin have antibacterial properties, and they are used in various fields. The reason why these metals exhibit antibacterial properties is that ions generated by dissolving in water destroy the cell walls and cell membranes of microorganisms and bind to enzymes and proteins to reduce their activity and metabolic function. Is said to be. In addition, it is said that the electrons released during ionization activate some of the oxygen dissolved in the air or water and chemically attack the organic matter in the microorganisms, which is also a factor of antibacterial properties. There is.

Phosphor bronze is an alloy containing tin and has excellent mechanical strength, conductivity, and workability. Therefore, it is mainly used in electronic parts and various electric products these days. Since it has excellent workability, it is easy to handle any shape and it is easy to process it into a shape that suits the application. By making good use of this feature and the high antibacterial properties of this product, it is different from the conventional one. Expected to develop different multifaceted applications.

From this point of view, an overview of examples of the use of copper alloys in fields requiring antibacterial properties includes, for example, socks in which a copper wire is woven to provide a preventive effect on athlete's foot. Further, Patent Document 2 discloses a filtration device for filtering an aqueous cleaning liquid using a wire mesh made of a metal such as copper or silver.

Further, Patent Document 3 discloses an antibacterial deodorant composed of titanium oxide particles carrying a deodorant antibacterial component selected from silver, copper, zinc, tin and the like, and an amine compound. However, all of these are not directly touched by human hands, but are placed in a spray-like, mist-like, or stationary place and pushed only when necessary. For example, they are attached to the passage of a medical institution. The fact is that we cannot find anything that is intended to be touched directly by hand and that requires a high degree of antibacterial properties, such as handrails.

The reasons for this are that phosphor bronze has not been clearly shown to be more antibacterial than pure copper, and that copper prices have been at market prices (LME London Metals) rather than producer prices for the last 30 years or so. Because it was decided by the exchange price), it became expensive, and the copper alloy was liable to discolor due to contact with the human body. However, the market price of copper is currently moderate and stable.

Japanese Unexamined Patent Publication No. 2015-214528 Japanese Unexamined Patent Publication No. 2010-137353 JP-A-2009-268510 Japanese Unexamined Patent Application Publication No. 1993-125591

Therefore, it is important that the phosphor bronze alloy powder uniformly applied to the surface of the filter with a spray gun or the like exhibits amplified antibacterial properties as compared with the phosphor bronze thin film plate-like product. It was also verified that the copper powder supported on the surface did not lose its antibacterial properties and did not peel off from the surface under any circumstances, and the linearized product had an amplified antibacterial property as compared with the thin film plate-shaped product. It is also important to verify whether it is a thing. After that, we propose the development of new applications for this product.

In view of the above problems, the present invention first clarifies the relationship between the phosphor bronze thin-film plate-like product and the phosphor bronze powder-like product, which are 10 to 20 micrometer meters, and the antibacterial property, based on the halo method test. If the phosphor bronze powder is put on a filter in a mixed solution of an aqueous solution and a binder, the antibacterial property is reduced when the phosphor bronze powder is uniformly supported by a spray gun. It is thought that the relationship between the antibacterial property and the case where the state product is put into a mixed solution of an aqueous solution and a binder and applied with a spray gun or the like can be roughly examined, and the problem can be solved smoothly.

That is, the present invention is a phosphor bronze alloy powder having high antibacterial properties, which comprises 1.05% by weight of tin and 0.09% by weight of phosphorus, and the balance is composed of copper and unavoidable impurities. Antibacterial properties of the materialized product itself, antibacterial properties of the filter surface when applied to the filter surface with a spray gun, etc. after being placed in a mixed solution of an aqueous solution and a binder, and finally antibacterial properties of thin film plate-shaped products having different shapes. In the three types of morphological comparison, the powdered product has an amplification effect due to the larger specific surface area, and the amount applied to the surface of the filter is 10 to 11% less antibacterial than the powdered product, but it is a thin film. In comparison with the plate-shaped product, an amplification effect of about 32% can be seen. These can be roughly compared by the halo method (however, the number of samples n> 3), which is a qualitative analysis method of antibacterial properties. The remaining issues need to be scrutinized to see if the liquid copper powder does not come off in the process of drying and if it does not start to elute again when the ambient temperature rises.

The purpose of the product of the present invention is to make the phosphor bronze alloy powdered product exhibit high antibacterial properties on two filters, a household air conditioner filter and an automobile air conditioner filter. It is important to consider expanding the application so that it can be used for other filters in the process based on the antibacterial property confirmation experiment.

Further, in the present invention, a powdered product classified into 10 to 20 microns of phosphor bronze is placed in a mixed solution of an aqueous solution and a binder, and after stirring, it is sprayed on the surface of each filter, a household air conditioner filter, and an automobile air conditioner filter. It is applied using a gun or the like, and when it passes through the filter, bacteria, viruses, etc. come into contact with the copper powder and are killed by the antibacterial action. Dead ones fall. It has a shape that can prevent clogging. It has also been confirmed that when the temperature is about 16 to 50 ° C., the binder does not peel off, and even when the humidity is 30 to 90%, the filter does not peel off due to the power of the binder.

Further, the present invention relates to the above-mentioned phosphor bronze alloy powdered product, and it is sufficient to put the phosphor bronze alloy powdered product in a mixed solution of an aqueous solution and a binder on the surfaces of an air conditioner filter for home appliances and an air conditioner filter for automobiles. It is a filter fibrous article characterized in that it is devised to prevent bacteria and viruses from entering the room or the automobile by uniformly supporting it on the filter surface with a spray gun or the like after stirring.

The present inventors have repeatedly tested the antibacterial properties of the powdered phosphorus bronze alloy with seven different filter raw materials such as acetate fiber, activated carbon fiber, and paper filter, and further set the environmental conditions to automobiles. As a result of examining that the filters can play their own purposes and roles even under adverse environmental conditions such as a maximum outside temperature of 50 ° C, a minimum interior temperature of 15 ° C, and a humidity of 30 to 90%. Non-woven fabrics (paper, felt, knitted fabrics) are the main raw materials for air conditioner filters for home appliances and filters for automobiles, and since they are used under the harshest conditions, we have investigated mainly non-woven fabrics. The result is shown. Even in the case of non-woven fabric, this phosphor bronze powder product could be uniformly supported on the surface of the filter and showed high antibacterial properties. Initially, it was considered to attach the linearized product to the surface of the filter in a mesh pattern, but the antibacterial test result was only about 7% (qualitative) of the powdered product, so the antibacterial of the powdered product. I thought about narrowing it down to and amplifying it further.

One of the antibacterial factors of copper is considered to be that the electrons emitted when the metal is ionized activate some of the oxygen dissolved in the air or water. It is as described above. Due to the difference in ionization potential and the accompanying difference in ionization tendency, each component contains 1.05% by weight of tin and 0.09% by weight of phosphorus, and the balance is composed of copper and unavoidable impurities. In the phosphor bronze alloy powdered product, the components constituting the alloy have the maximum ionization potential and the ionization tendency associated therewith, so that the phosphor bronze alloy powdered product having other component components has the largest ionization potential. The reason for exhibiting high antibacterial property was found.

The appearance of the phosphor bronze alloy powdered product is not spherical but has a shape with many irregularities, which is one of the factors that maximize the specific surface area. That is, in the case of powdered products by the water atomization method, the shape of the powdered product powdered by the mechanical atomization method is flat, and the shape of the powdered product powdered by the gas atomization method is spherical. The specific surface area of the powdered product powdered in (1) is considerably smaller than that of the water atomization method. Therefore, the inventors have selected the water atomization method that maximizes the specific surface area, and pulverized the phosphor bronze powder by the water atomization method can maximize the antibacterial property of the powdered product.

Photograph showing an example of the halo test Photograph showing an example of film adhesion method test Under artificial lung (simple) Electron micrograph of phosphor bronze powder produced by the water atomization method Photograph of pressure loss experimental equipment Pressure loss Pressure loss diagram of two different filters Automotive air conditioner 1800-2000CC type Same as above 1200-1300CC type Using a mask gauze with a higher degree of freedom than the filter, a phosphorus bronze powder was uniformly supported on the surface of the gauze, and a peeling experiment was conducted under 5 conditions. 1) Use of equipment that looks like an artificial lung Temperature 25 ° C, humidity 45% Before intake and exhaust 2) Indoor air intake and exhaust for 24 hours Temperature 25 ° C, humidity 45% 24 hours intake and exhaust 3) Air that simulates heat generation is absorbed and exhausted for 24 hours Temperature 40 ° C, humidity 50% 4) High temperature humidification condition after intake Simulates heat generation / high humidity and sucks and exhausts air for 24 hours Temperature 40 ° C, humidity 85% 5) Bending Simulates bending by putting on and taking off a mask: 5 times in 8 hours Bending temperature 25 ° C Humidity 45% 24 hours Intake and exhaust In Fig. 4, a syringe that looks like an artificial lung is driven, and the experimental conditions of 50 rotations / minute are carried out under the above five conditions, and the phosphorus bronze is peeled off by the type of element. And measure the content

Next, the phosphor bronze alloy powdered product is uniformly supported on the non-woven fabric that is in the pre-manufacturing stage such as a household air filter, an automobile air conditioner filter, etc., and then the phosphor bronze alloy powdered product is appropriately supported according to the application. After cutting to size, the filter originally attached to the home air conditioner and automobile air conditioner was removed, the filter was replaced, and the experiment was repeated.
No household air conditioner filter is coated with or impregnated with antibacterial material. However, some automobile air conditioner filters are impregnated with antibacterial components, but the effect almost disappears in about two months. In addition, although it is described that it has a deodorizing effect, the effect almost disappears after about 2 months.
On the other hand, those in which the phosphor bronze alloy powdered product is uniformly supported have a continuous antibacterial effect, and in addition, a deodorizing effect can be expected to continue as well.

First, it is a rolled phosphor bronze thinned plate-like product containing 1.05% by weight of tin and 0.09% by weight of phosphorus, and the balance is composed of copper and unavoidable impurities. The phosphor bronze thinned plate-like product having the above is redissolved, and the copper alloy dissolved by the water atomization method is rapidly rapidly cooled to obtain a powdered product. Only the powdered product obtained by air-classifying the powdered product and having a convex distribution of 10 to 20 microns is used. The reason for using only 10 to 20 microns is to prevent the pulverized product from becoming too fine and block the mesh of the non-woven fabric, or the pulverization produced by the water atomization method is characteristic. This is because if the shape is uneven and the particle size is uniform, the non-woven fabric can be accurately supported by the mesh.

The filter was sheared to a length x width of 28 mm x 28 mm in order to make the supported filter product supported on the uniform filter of this highly antibacterial powdered product the same size as the thin film plate-shaped product length x width 28 x 28 mm product. Then, a halo test according to JIS L 1902 was conducted. The bacterium used in the test is one type of Staphylococcus aureus. FIG. 1 is a photograph showing an example of a halo test, and here is an example of Staphylococcus aureus.
The thin-film plate-shaped product and the powdered product show incomparably high antibacterial properties.

In the halo test, the bacteria are placed in agar (food for the bacteria) in a petri dish and cultured, and then a test piece (length 28 mm x width 28 mm) is placed in the center and held for a certain period of time. Then, the width of the area called the halo where the bacteria around the test piece have disappeared is measured. The test was carried out three times with different test pieces for one bacterial species. As shown by A, B, C, and D in FIG. 1, the halo width is measured on the four sides of the test piece, so that the n number of the test is n = 3 this time, so 12 for the condition. Two measurements were taken.

As shown above, according to the present invention, the phosphor bronze alloy powdered product having high antibacterial properties is used as a household air conditioner filter and an automobile air conditioner filter, and has its functions, high antibacterial properties and deodorizing properties. However, as a result of the above experiments, an amplification effect of antibacterial activity was observed as compared with the phosphor bronze alloy thinned plate product and the phosphor bronze alloy linear product, and in addition, strong deodorizing property was observed in deodorizing property. .. Based on this result, not only household air conditioner filters and automobile air conditioner filters, but also other filters, even if they are used as they are for filters using non-woven fabric, paper, etc., they can be used for many purposes. Can be provided.

The present invention is not limited to the above-described embodiment, and does not deviate from the gist of the present invention, including various modifications and modifications that can be conceived by a person having ordinary knowledge in the field of the present invention. Of course, even if there is a design change in the range, it is included in the present invention.

Claims (4)

A household air conditioner filter for a phosphor bronze alloy powder containing 1.05% by weight of tin and 0.09% by weight of phosphorus and having antibacterial properties, the balance of which is composed of copper and unavoidable impurities. In addition, after carefully checking the front and back of the non-woven fabric in a place generally called a filter such as an air conditioner filter for automobiles, the article is intended to be uniformly supported to prevent the invasion of bacteria and viruses in the intake and exhaust parts. As a result of classifying the powdered product with an air classifier so that a 10 to 20 micron size product can be obtained, the highly antibacterial phosphor bronze powder product characterized by having a convex distribution is used as an aqueous solution and a binder. After putting it in a mixed solution and stirring it well with a stirrer, the filter has high antibacterial and antiviral properties by uniformly spraying it on the surface of a household air conditioner filter and an automobile filter using a spray gun or the like. An article characterized by being granted. The highly antibacterial and antiviral filter of claim 2 must clear the following three elements. (1) Due to the temperature setting mechanism, even if the minimum temperature is 16 ° C and the maximum temperature is 36 ° C (maximum temperature of outside air temperature is 50 ° C), the same high antibacterial and antiviral properties are exhibited. Although it depends largely on the temperature, outside air temperature, and outside air humidity, the phosphorus bronze powder, which has high antibacterial and antiviral properties, does not peel off from the filter non-woven fabric even at a minimum humidity of 30% and a maximum humidity of 70%. In addition, metal powder will never enter the vehicle by being sucked in. (3) The filter non-woven fabric will not be clogged for at least one year. The above three elements cannot be used unless they are cleared while maintaining high antibacterial and antiviral properties. There is no problem in this as long as the ratio of the aqueous solution and the Japanese glue (Wanikawa) as the binder and the decay temperature of the Japanese glue are within 80 ° C. It can be seen that there is no problem because the binder liquid once discharged from the spray gun shows a property that once it adheres to something, it is resistant to low temperatures and does not peel off up to a high temperature of 80 ° C. The 10 to 20 micron size product according to claim 2 has a filter void size of 5 microns, and therefore, if it is 10 to 20, it indicates a size that does not enter inside, and in addition, the temperature. It is important that it is the maximum size that can withstand humidity and wind pressure (does not collapse). If it is smaller than this, it may enter through the void, and if it is larger than this, it is expected to collapse due to wind pressure (suction force).
As a result of repeating the experiment of claim 4 and examining whether the gauze used in claim 4 is regarded as a gauze having a larger degree of freedom and the article to be examined is not peeled off from the gauze, the number of n is set to 9 in the same manner. It is an article.

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