JPH09155125A - Antibacterial filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To greatly enhance the antimicrobial power without damaging the function of an antibacterial filter by allowing a specified antibacterial agent to be carried together with a specified substance. SOLUTION: The antibacterial filter has a structure in which a bamboo vacuum dry distillate (B) together with a polymer (C) are supported with the porous material (A) such as sheetlike fibrous material. The bamboo vacuum dry distillate (B) is distilled out when bamboo is dry-distilled in the decomposition conditions. The polymer (C) can be dissolved or dispersed in water and/or a solvent miscible with water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial filter mainly for an air conditioner (including an air cleaner) having an improved antibacterial power.

[0002]

2. Description of the Related Art A filter of an air conditioner for making a living environment comfortable may carry various antibacterial agents and deodorants for imparting antibacterial and deodorant properties. By doing so, it is possible to further purify the living environment.

Various types of antibacterial agents and deodorants for imparting antibacterial and deodorizing power to air conditioner filters have been proposed at present, but in consideration of safety and cleaning ability, they are put into practical use. There seems to be not much that is possible.

[0004] The commercially available and well-received cleaning agent is a plant-derived deodorant marketed by the applicant of the present invention, that is, a vacuum distillation product distilled when tea leaves are carbonized under reduced pressure conditions. Is an active ingredient.

As for plant dry distillation products, other than tea leaves are also known. For example, in Japanese Unexamined Patent Publication No. 6-227931, an antibacterial component comprising a dry-distillate of a plant selected from the group consisting of perilla, bamboo, ginger, wormwood and garlic, and containing or carrying the component inside or on the surface thereof Antibacterial products are shown. However, this product is mainly for food additives, and there is no description about its application to filters for air conditioners.

[0006]

[Problems to be Solved by the Invention]
By supporting a plant-derived antibacterial agent or deodorant, the atmosphere in the room or in the vehicle can be cleaned as such.
While an atmosphere containing microorganisms and malodorous components passes through the filter, it comes into contact with the antibacterial agent or deodorant, or the antibacterial agent or deodorant volatilizes into the atmosphere. Because it captures and makes it harmless.

However, since pollutants in the atmosphere and nutrient sources for microorganisms are accumulated in the filter for the air conditioner,
When the filter is used for a certain number of days, microorganisms are propagated on the filter itself, which often causes an unpleasant odor when the air conditioner starts operating. It is considered that the cause is that pollutant components that exceed the processing speed and processing capacity of the antibacterial agent and deodorant carried on the filter adhere to the filter in a short time.

Such troubles can be solved by frequently replacing the filter on the user side, but such replacement is very troublesome and economically disadvantageous, so that it is practically not executed.

The present inventors have found that even if contaminants in the atmosphere or nutrient sources for microorganisms are accumulated in the filter, the drug (antibacterial agent,
The deodorant) has a processing speed and processing capacity that are higher than that of the deodorant. Since the thickness of the upper filter itself is thin, it is not easy to load a large amount of chemicals on the filter, and if it is forcibly loaded in a large amount, the filter will become clogged and the physical function of the filter will be reduced. However, there was a problem in that the activity of the drug was not sufficiently exerted relative to the amount of the drug loaded, and the killing action was caused.

Under such a background, the present invention mainly supports an air conditioner in which a specific antibacterial agent is used in combination with a specific substance so as to significantly improve the antibacterial activity without impairing the function of the filter. The purpose of the present invention is to provide an antibacterial filter for a machine.

[0011]

The antibacterial filter of the present invention comprises a porous material (A), a bamboo decompressed dry distillate (B), which is distilled when the bamboo is dry-distilled under reduced pressure conditions, with water or / and It has a structure in which it is supported together with a polymer (C) which can be dissolved or dispersed in a water-miscible solvent.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

As the porous material (A), a sheet-like or entangled fibrous material made of paper, non-woven fabric, woven fabric, knitted fabric, fiber entangled material or the like is preferably used. It may be any of natural fibers, synthetic fibers and inorganic fibers.
It is also possible to use paper in the form of corrugated board and utilize the corrugated board's eyes. In addition to fibrous materials, porous sponge-like materials can also be used, and materials in which particles (particularly porous particles) are filled or solidified can also be used. The basis weight and density of the porous material (A) are appropriately determined mainly in consideration of being used as a filter of an air conditioner (including an air cleaner).

As the bamboo vacuum-distilled product (B), a vacuum-distilled product obtained by pulverizing bamboo (in particular, Moso bamboo), if necessary, pulverizing and drying it, and then distilling it under reduced-pressure conditions is used.

As the reduced pressure condition, a condition of 100 mmHg or less, preferably 10 to 60 mmHg, and particularly 15 to 45 mmHg is preferably adopted. The initial fraction at the time of vacuum distillation may be appropriately cut, or the vacuum distillation product may be further purified.

Although the distillation temperature of the dry distillate during the vacuum distillation is dependent on the degree of vacuum (low when the vacuum is high and high when the vacuum is low), for example, around 300 ° C. in the case of vacuum distillation of 20 mmHg. Becomes

Bamboo decompression dry distillation product obtained by the above operation
(B) is usually a viscous liquid, so once distillate is
It is suitable to receive it with ethanol, propylene glycol or the like, then adjust the concentration with water or ethanol, and then carry out the loading operation on the porous material (A).

As the polymer (C), a polymer which can be dissolved or dispersed in water or / and a water-miscible solvent is used. In particular, a water-soluble or alcohol-soluble polymer having hydrophilicity and moderate viscosity increase is preferable, and examples of such a polymer include polyvinylpyrrolidone, polyvinyl alcohol, sodium polyacrylate, carboxyvinyl polymer, and polyethylene. Synthetic polymers such as oxide, polyacrylamide, polyvinyl ether, water-soluble nylon, cellulose derivatives such as carboxymethyl cellulose, methyl cellulose, ethyl cellulose, starches,
Examples include plant mucilage and microorganism-produced mucilage. In the case of the dispersion type (emulsion) type, a wide range of polymers can be used.

Polymer for 1 part by weight of porous material (A)
The supported amount of (C) can be selected from a wide range,
Usually, it is preferably 0.01 to 5 parts by weight, particularly 0.05 to 3 parts by weight. When the amount of the carried amount is extremely small, the effect of increasing the carried amount of the bamboo vacuum distillate (B) and the effect of increasing the antibacterial action are obtained. When the amount is insufficient, and the amount of the loaded material is extremely large, the material is porous.
It may clog (A) and impair the function as a filter.

The amount of the bamboo reduced-pressure dry distillate (B) supported on 1 part by weight of the porous material (A) is 0.01 to 5 parts by weight, especially 0.02 part by weight, based on the distillate (including water) at the time of reduced-pressure dry distillation. It is preferable that the amount is 3 to 3 parts by weight. When the amount of the polymer is too small, the antibacterial effect is insufficient. On the other hand, when the amount of the polymer is more than the limit, it means that the polymer is water-soluble or alcohol-soluble.
Since the amount of (C) supported must be excessively large, the porous material (A) will be clogged.

The ratio of the bamboo vacuum destillation product (B) to the water-soluble or alcohol-soluble polymer (C) is
(C) Bamboo reduced pressure dry distillation product (B) may be 0.1 to 100 parts by weight, especially 0.2 to 50 parts by weight, based on the distillate (including water) at the time of reduced pressure dry distillation. The balance is preferably achieved in this range. However, the combined use of the bamboo vacuum-distilled product (B) and the polymer (C) produces a certain positive effect regardless of the amount of each, and therefore the amount is not necessarily strictly limited to the above range.

The bamboo reduced pressure dry distillate (B) and the polymer (C) are supported on the porous material (A) by adding the bamboo reduced pressure dry distillate (B) and the polymer (C) to water or / and a water-miscible solvent. In the state of being dissolved or dispersed in
A method of dipping (A), then squeezing it between rolls if necessary, and then naturally drying or forcibly drying is suitably adopted. Instead of the dipping method, it can be supported by a coating method or a spray method.

The antibacterial filter of the present invention is particularly useful as a filter for an air conditioner (including an air cleaner) and a deodorizer, and in addition, a filter attached to a dust collector, a dehumidifier, a blower / exhaust fan, a vacuum cleaner, etc. It can also be used as a filter for other purposes.

<Operation> According to the present invention, the antibacterial activity is greatly increased by using the polymer (C) which can be dissolved or dispersed in water or / and a water-miscible solvent in combination with the bamboo vacuum distillate (B). To do. The combined use of the polymer (C) also contributes to an increase in the amount of the bamboo vacuum destillation product (B) supported on the porous material (A).
In addition, the combined use of the polymer (C) in an appropriate amount does not cause clogging of the porous material (A) and impairs the function as a filter, and can also reduce the activity of the bamboo vacuum dry distillate (B). Absent.

Therefore, when the porous material (A) supporting the bamboo vacuum destillation product (B) and the polymer (C) is used as a filter for an air conditioner or the like, contamination of the atmosphere in the filter is caused. Even if the components are accumulated, the processing speed and processing capacity of the polluted components by the bamboo vacuum dry distillate (B) exceed the sufficient antibacterial activity, and an unpleasant odor is generated when the air conditioner starts operating. Troubles can be sufficiently suppressed.

In addition, the use of the bamboo vacuum-distilled product (B) has a large antibacterial effect (expected to eliminate bacteria and viruses in the indoor space), has a deodorizing effect, and has a raw material source. Abundant and does not depend on the season when raw materials are obtained,
Since it is derived from a natural product, it has many advantages in that it is harmless to the human body.

[0027]

The present invention will be further described with reference to the following examples. Hereinafter, “parts” and “%” are expressed on a weight basis. “PVP” is an abbreviation for polyvinylpyrrolidone.

<Acquisition of Bamboo Vacuum Dry Distillation> Bamboo (Mosotake)
Is supplied to a vacuum distillation apparatus, and the pressure is about 20 mmHg,
The mixture was subjected to dry distillation under reduced pressure at a temperature of about 300 ° C., the distillate (containing water) was received with ethanol, and the concentration was adjusted with ethanol to obtain a hydrous ethanol solution having a distillate concentration of about 20%. In the examples below, this distillate concentration is about 20%.
The water-containing ethanol solution of is referred to as a stock solution. This stock solution has a nonvolatile content of about 3% and an ethanol content of about 80%.
%Met.

Example 1 (Preliminary Test) <Preparation of Treatment Solution> The above stock solution was diluted with water to give a stock solution concentration of 0% (water only) and a stock solution concentration of 10% (diluted with 9 times water).
Concentration of stock solution is 50% (diluted with double water), concentration of stock solution is 100
% (Without dilution with water, so the concentration of ethanol is about 80%). In addition, PVP powder (“K-60” manufactured by Nacalai Tesque, Inc.) was added to each solution thus prepared in an amount of 5% or 10% with respect to each preparation liquid.
% Was added and dissolved. As a result, 12 of Table 1 described later
A seed treatment solution was obtained.

<Preparation of Filter Sample> Each of the treatment liquids obtained above was added to No. 2 filter paper (diameter 55
mm, basis weight 90 g / m ² ) and then pull up to measure the supported amount in the wet state, then temperature 60
Dry at 24 ° C. for 24 hours. The results are shown in Table 1 below. The higher the concentration of the stock solution, the smaller the amount supported in the wet state tends to be because the amount of ethanol increases.
It can also be seen that the higher the concentration of PVP, the greater the amount supported in the wet state.

<Antibacterial test> Escherichia col as bacteria
i IFO 3806 and Staphyrococcus aureus IFO 13276 were prepared, shake-cultured in BHI broth for 24 hours, and then dispersed in 100 ml of sterilized water.

The dried filter paper was cut into 10 mm squares. Precultured, 0.2 ml of the bacterial solution prepared in a liquid medium was added to a level of 10 ⁵ cells / ml, and left at 35 ° C. for 18 hours. After standing, the bacteria were dispersed in 20 ml of sterilized physiological saline, and the viable cell count was measured by an agar plate smearing method on an ordinary agar medium. The results are shown in Table 1 below.

<Conditions and Results> Conditions and results are shown in Table 1 below.
Are shown together. In Table 1, the supported amount is the total supported amount of the stock solution and PVP in the wet state. Ec is
Echerichia coli IFO 3806, Sa is Staphyrococcus aur
Acronym for eus IFO 13276. (nd) means not detected. 1 and 2 show the relationship between the stock solution concentration and the number of bacteria at various PVP concentrations.

[0034]

[Table 1] 0% stock solution / 0% PVP, 10% stock solution / 0% PVP, 50% stock solution / 0% PVP, 100% stock solution / 0% PVP Carried amount 0.48g Carried amount 0.43g Carried amount 0.24g Carried amount 0.03g Ec 1.28 × 10 ⁸ Ec 1.00 × 10 ⁴ Ec (nd) Ec (nd) Sa 3.76 × 10 ⁷ Sa (nd) Sa (nd) Sa (nd) 0% stock solution / 5% PVP, 10% stock solution / 5% PVP, 50% Stock solution / 5% PVP, 100% Stock solution / 5% PVP Carried amount 0.60 g Carried amount 0.54 g Carried amount 0.34 g Carried amount 0.10 g Ec 5.20 × 10 ⁷ Ec 1.40 × 10 ³ Ec (nd) Ec (nd) Sa 2.42 × 10 ⁸ Sa (nd) Sa (nd) Sa (nd) 0% stock solution / 10% PVP, 10% stock solution / 10% PVP, 50% stock solution / 10% PVP, 100% stock solution / 10% PVP Loaded amount 0.62 g Amount 0.62g Supported amount 0.63g Supported amount 0.30g Ec 1.10 × 10 ⁵ Ec (nd) Ec (nd) Ec (nd) Sa 2.88 × 10 ⁴ Sa (nd) Sa (nd) Sa (nd) (Note) Blank test In the case of, Ec is 1.92 × 10 ⁸ and Sa is 1.44 × 10 ⁸ .

<Analysis> In Table 1 above, the stock solution concentration increases toward the right side, but the antibacterial effect increases toward the right side. In addition, PV goes down
Although the P concentration is high, it can be seen that the antibacterial effect is greater toward the lower side.

Example 2 (Main test) <Preparation of treatment liquid> The above-mentioned stock solution was diluted with ethanol (since PVP is slightly soluble in water), the stock solution concentration was 0.
% (Ethanol only), stock solution concentration 10% (diluted with 9 times ethanol), stock solution concentration 50% (diluted with 2 times ethanol), stock solution concentration 100% (no ethanol dilution) were prepared. . In addition, PVP powder was added to each of the solutions thus prepared in an amount of 5% to 10%.
It was melted by throwing it in to%. As a result, 12 types of treatment liquids shown in Table 2 below were obtained.

<Preparation of Filter Samples> White non-woven fabric (300 mm ×
After dipping 300 mm and basis weight 50 g / m ² ), it was pulled up to measure the amount supported in a wet state, and then dried at a temperature of 60 ° C. for 24 hours. The results are shown in Table 2 below. It can be seen that the higher the concentration of PVP, the greater the amount supported in the wet state.

<Antibacterial test> Escherichia col as bacteria
i IFO 3806 and Staphyrococcus aureus IFO 13276 were prepared, shake-cultured in BHI broth for 24 hours, and then dispersed in 100 ml of sterilized water.

The non-woven fabric after drying was cut into 10 mm squares. Precultured, 0.5 ml of the bacterial solution prepared in a liquid medium was added to a level of 10 ⁵ cells / ml, and the mixture was left standing at 35 ° C for 18 hours. After standing, the bacteria were dispersed in 20 ml of sterilized physiological saline, and the viable cell count was measured by an agar plate smearing method on an ordinary agar medium. The results are shown in Table 2 below.

<Conditions and Results> Conditions and results are shown in Table 2 below.
Are shown together. In Table 2, the supported amount is the total supported amount of the stock solution and PVP in the wet state. Ec is
Echerichia coli IFO 3806, Sa is Staphyrococcus aur
Acronym for eus IFO 13276. (nd) means not detected. 3 and 4 show the relationship between the stock solution concentration and the number of bacteria at various PVP concentrations.

[0041]

[Table 2] 0% stock solution / 0% PVP, 10% stock solution / 0% PVP, 50% stock solution / 0% PVP, 100% stock solution / 0% PVP Supported amount 8.9g Supported amount 13.7g Supported amount 10.9g Supported amount 12.6g Ec 2.00 × ^{10 8 Ec 2.12 × 10 7 Ec} 1.70 × 10 6 Ec 1.60 × 10 1 Sa 3.00 × 10 7 Sa 3.60 × 10 5 Sa 1.50 × 10 4 Sa 1.20 × 10 1 0% stock solution / 5% PVP, 10% stock solution / 5 % PVP, 50% stock solution / 5% PVP, 100% stock solution / 5% PVP Carried amount 11.8g Carried amount 16.0g Carried amount 15.8g Carried amount 14.2g Ec 1.00 × 10 ⁸ Ec 1.90 × 10 ⁶ Ec 1.30 × 10 ² Ec (nd) Sa 4.50 × 10 ⁶ Sa 1.50 × 10 ⁴ Sa 7.00 × 10 ¹ Sa (nd) 0% stock solution / 10% PVP, 10% stock solution / 10% PVP, 50% stock solution / 10% PVP, 100% stock solution / 10% PVP loading amount 15.7 g loading amount 17.4 g loading amount 20.9 g loading amount 19.0 g Ec 1.72 × 10 ⁸ Ec 5.00 × 10 ³ Ec 2.40 × 10 ¹ Ec (nd) Sa 1.50 × 10 ⁶ Sa 6.00 × 10 ² Sa ( nd) Sa (nd) (Note) Ec in the blank test is 3.80 × 10 ⁸ and Sa is 2.20 × 10 ⁸ . The initial number of bacteria was 1.30 × 10 ^{6 for} Ec and 4.00 × 10 ^{5 for} Sa.

<Analysis> In Table 2 above, the stock solution concentration increases toward the right side, but the antibacterial effect increases toward the right side. In addition, PV goes down
Although the P concentration is high, it can be seen that the antibacterial effect is greater toward the lower side. In this case, although PVP is not an antibacterial component, it is understood that the influence of the PVP concentration is considerably large.

The results of Table 2 show that the effect of the antibacterial activity is reduced as a whole when compared with the results of Table 1 of the preliminary test, but this is because the non-woven fabric used in this test has a good openness and unit weight. Since it is different from that of the filter paper used in the test, this is because the bacterial solution did not come into sufficient contact, and more preferable results can be obtained by selecting the type of nonwoven fabric.

<Supplementary Explanation of Test Methods of Examples 1 and 2> When the air purifier is operated, dust and bacteria adhere to the filter, the bacteria propagate on the filter, and the propagated bacteria indoors. Scatter on. Therefore, it is necessary to prevent the growth of bacteria on the filter.

Since it is considered that dust or the like will serve as a nutrient source and the bacteria will propagate, the bacteria were dispersed in a liquid medium for growing the bacteria as a nutrient source and attached to a filter to evaluate the antibacterial effect.

When the initial number of bacteria and the number of bacteria after 24 hours are compared, proliferation means that there is no antibacterial effect, almost the same means that there is a bacteriostatic effect (growth suppressing effect), and decrease means sterilization. Means effective. The relationship between the initial number of bacteria and the blank test is that the bacteria grow naturally because they are nourished and left to stand.

[0047]

According to the present invention, the polymer (C) which can be dissolved or dispersed in water or / and a water-miscible solvent is used in combination with the bamboo vacuum distillate (B). As a result, the antibacterial activity is greatly increased. The combined use of the polymer (C) also contributes to an increase in the amount of the bamboo vacuum destillation product (B) supported on the porous material (A) made of paper or a non-woven fabric. In addition, the combined use of the polymer (C) in an appropriate amount does not cause clogging of the porous material (A) and impairs the function as a filter, and also reduces the activity of the bamboo vacuum dry distillate (B). Absent.

Therefore, when the porous material (A) supporting the bamboo vacuum-distilled product (B) and the polymer (C) is used as a filter for a purpose such as for an air conditioner, the filter in the atmosphere is Even if pollutants are accumulated, the bamboo decompression dry distillate (B) exceeds the processing speed and capacity of the pollutants to exert sufficient antibacterial activity, and an unpleasant odor is generated when the air conditioner starts operating. Such troubles can be sufficiently suppressed.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between the stock solution concentration and the number of bacteria (Echerichia coli) at various PVP concentrations in the case of Example 1.

FIG. 2 is a graph showing the relationship between the stock solution concentration and the number of bacteria (Staphyrococcus aureus) at various PVP concentrations in the case of Example 1.

FIG. 3 is a graph showing the relationship between the stock solution concentration and the number of bacteria (Echerichia coli) at various PVP concentrations in the case of Example 2.

FIG. 4 is a graph showing the relationship between the stock solution concentration and the number of bacteria (Staphyrococcus aureus) at various PVP concentrations in the case of Example 2.

Claims (4)

[Claims] 1. A porous material (A), which can be dissolved or dispersed in water or / and a water-miscible solvent with a bamboo vacuum destillation product (B) distilled when the bamboo is dry-distilled under reduced pressure conditions. molecule
An antibacterial filter configured to be carried together with (C). 2. The antibacterial filter according to claim 1, wherein the porous material (A) is a sheet-shaped or entangled fibrous material. 3. The antibacterial filter according to claim 1, wherein the polymer (C) is a water-soluble or alcohol-soluble polymer. 4. The antibacterial filter according to claim 1, which is a filter for an air conditioner.