JPH1033921A - Antibacterial filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter which has high virus adsorptivity and also has excellent antibacterial properties by containing noncrystaline calcium phosphate and photosemiconductor composition in a base material sheet. SOLUTION: In the filter used for an air-conditioner, an air cleaner and a vacuum cleaner or the like, noncrystalline calcium phosphate and a photosemiconductor composition are dispersedly contained in a base material formed into a sheet shape. Or, noncrystalline calcium phosphate and the photosemiconductor composition are stuck to the base material formed into the sheet shape through an adhesive. The adhesive containing a curing type resin and/or an organic solvent-soluble natural-based resin is used as the above- mentioned adhesive. A material generally used as the filter is utilized for the used base material. For example, paper such as Japanese paper and wadding paper, woven fabric and nonwoven fabric consisting of a natural fiber and a synthetic fiber or the like and a plastic foam such as a polyurethane foam having an open cell are used for the used base material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

It relates filter present invention having antimicrobial properties BACKGROUND OF THE INVENTION, further detail, further bacteria and viruses during or liquid air may cause one efficiency of NO _X, etc. which are said of asthma such as adsorption And an antibacterial filter that can also exert an antibacterial effect.

[0002]

2. Description of the Related Art Conventionally, air conditioners, air purifiers, ventilation fans,
Vacuum cleaners and the like are provided with various filters for purifying air. As such a filter, for example,
Japanese Patent Publication No. 7-14447 describes a calcium phosphate filter in which specific calcium phosphate is contained in paper, nonwoven fabric, or the like, and it is said that this filter can effectively capture bacteria, viruses, and the like.

Japanese Patent Application Laid-Open No. 6-245139 discloses that an optical semiconductor ceramic, apatite, zeolite,
A functional body obtained by spraying a mixed powder with a ceramic having adsorption performance such as activated carbon is described. It is said that such thermal spraying is performed when an optical semiconductor ceramic is applied, or when kneaded in a binder and applied to a substrate, an effective electrochemical action cannot be caused.

[0004]

[Problems to be solved by the invention]
In the filter described in 7-14447, even if bacteria and viruses can be adsorbed and captured using specific calcium phosphate, they cannot be sterilized and antibacterial, so that bacteria may propagate on the filter. There is. Therefore, the "antibacterial effect" required in a medical site or a manufacturing site of a food product or the like that requires high hygiene management cannot be obtained with the above filter.

[0005] In addition, in the embodiment of Japanese Patent Publication No. 7-14447, water-soluble polyvinyl alcohol is used as an adhesive to include specific calcium phosphate in paper, non-woven fabric, etc. There is a drawback that it is easily desorbed due to moisture and humidity in the air.

[0006] In addition to the low adsorption performance of zeolite and activated carbon used in the sprayed functional body as disclosed in JP-A-6-245139, as is clear from the description, the adsorption performance of the zeolite and the activated carbon is not significant. Since the powder mixture with ceramics is instantaneously exposed to a high temperature of 3000 ° C,
In particular, there is a problem that the specific surface area of apatite is reduced by sintering, and the virus removal efficiency is reduced.
In addition, such thermal spraying includes gas spraying torches, oxygen,
Since a gas such as acetylene or hydrogen is used, there are problems that the equipment becomes complicated and the production cost increases.

Accordingly, an object of the present invention is to provide a filter having high adsorption performance and excellent antibacterial properties, and further a filter having a substance having the adsorbing ability and a substance having antibacterial properties which are not easily desorbed.

[0008]

Means for Solving the Problems In view of the above-mentioned problems, as a result of intensive studies, the present inventors have found that by including amorphous calcium phosphate and a photosemiconductor composition in a base sheet, they have a high virus adsorption ability. In addition, a filter having excellent antibacterial properties can be obtained, and by bonding the amorphous calcium phosphate and the photosemiconductor composition to a base sheet using a non-water-soluble adhesive, the filter can be used in water, or used in water. The present inventors have found that the antimicrobial particles hardly detach from the substrate even when used in an environment having a high temperature, and completed the present invention.
That is, the present invention is an antibacterial filter characterized in that amorphous calcium phosphate and an optical semiconductor composition are dispersed and contained in a sheet-shaped substrate.

The present invention is also an antibacterial filter comprising an amorphous calcium phosphate and an optical semiconductor composition adhered to a sheet-shaped substrate via an adhesive. Further, the present invention is the antibacterial filter, wherein the adhesive is an adhesive containing a curable resin and / or a natural resin soluble in an organic solvent.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The base material formed into a sheet shape used in the present invention may be any material that can be generally used as a filter, that is, any material that allows the passage of air or liquid but can capture the desired particulate matter. There may be. Particularly preferred are, for example, paper such as Japanese paper and watting paper, woven and non-woven fabrics made of natural fiber, synthetic fiber and the like, and plastic foam such as polyurethane foam having open cells.

The amorphous calcium phosphate (Amorphous Calcium Phosphate) used in the present invention is hereinafter referred to as ACP.
May be abbreviated. ) Is prepared from a slurry containing it in particulate form. Such a slurry is obtained by adding a neutral or weakly alkaline water-soluble polymer dispersant, for example, a weakly alkaline ammonium triacrylate to a calcium hydroxide suspension under stirring to obtain a mixed solution. An aqueous phosphoric acid solution was added dropwise while stirring the mixed solution to adjust the pH to 11.
It is obtained by adjusting to ５5. In order for the porous body of ACP obtained by granulating the slurry to have a large specific surface area, the average particle size of the primary particles of the ACP in the slurry is desirably less than 0.1 μm. The particle size in the present specification is measured by a laser diffraction method.

The above-mentioned water-soluble polymer dispersant is added in order to avoid aggregation of ACP particles having a particle size of less than about 0.1 μm in the slurry. %, Preferably 0.1 to 3% by weight.

The content of ACP in the slurry is preferably adjusted so as to be 1 to 90% by weight, particularly preferably 5 to 50% by weight. When the ACP in the slurry exceeds 90% by weight, the viscosity of the slurry becomes high, which makes the slurry unsuitable for granulation described below. ACP in slurry
Is changed in the range of 1 to 90% by weight,
A porous body having a desired average particle size can be obtained.

From the diffraction pattern obtained by the powder X-ray analysis, the ACP particles were found to be tricalcium phosphate [formula: Ca ₃ (PO ₄ ) ₂ .nH ₂ O] containing water of crystallization.
Further, since the pattern is broad, it is confirmed that the pattern is amorphous. Furthermore, since the ACP particles contain water of crystallization, they are considered to be electrostatically active substances, and are presumed to easily adsorb various bacteria and viruses whose surfaces are charged.

The slurry containing the ACP particles is granulated to obtain a porous body. The granulation method is not particularly limited as long as it can produce a porous body having a substantially spherical shape and a specific surface area of 10 m ² / g or more. For example, a spray-drying granulation method, a granulation method obtained by crushing after freeze-drying, a high-speed stirring type granulation method, and the like can be used.
By this granulation, the ACP is preferably made into porous particles (ACP porous particles) having an average particle size of 8 to 200 μm.

The ACP used in the present invention is characterized in that it is not fired. By not firing, very fine particles can be obtained, the specific surface area of the particles can be kept large, and an excellent adsorption effect can be exhibited.

It is to be noted that an antibacterial metal ion may be added to the slurry, and the antibacterial metal ion may be adsorbed on the ACP particles to impart antibacterial properties to the obtained porous particles. Such antibacterial metal ions include gold, silver, zinc,
Copper, tin, lead, arsenic, platinum, iron, antimony, nickel,
Aluminum, barium, cadmium, ions such as manganese, and the like, may be used alone,
A mixture thereof, a metal compound, or an aqueous solution thereof may be used.

By mixing the antibacterial metal powder, the antibacterial metal compound, or the aqueous solution thereof in the slurry so as to be 50% by weight or less with respect to the slurry, the ACP particles having the antibacterial metal ion adsorbed thereon are mixed. can get. The particle size of the antibacterial metal powder and the antibacterial metal compound powder is desirably 20 μm or less in order to enhance reactivity. Further, it is desirable that the slurry and the antibacterial metal powder, the antibacterial metal compound powder or the antibacterial metal aqueous solution are mixed at room temperature under alkalinity. If the temperature exceeds 80 ° C., phosphoric acid is easily eluted from the ACP.
This is because P is decomposed and a secondary product such as silver phosphate is easily formed.

The optical semiconductor composition according to the present invention includes:
TiO ₂ , CdS, CdSe, WO ₃ , Fe ₂ O ₃ , SrT
iO ₃ , KNbO and the like can be mentioned, and these can be used alone or in combination of two or more. These optical semiconductor compositions are excited when irradiated with light, and the excited electrons and holes generated by the light irradiation are combined with oxygen and hydrogen in the air on the surface of the optical semiconductor composition, and O ₂ ⁻ , O ⁻ , OH Such active oxygen species are generated. It is believed that this active oxygen inhibits bacteria and viruses and decomposes odors.

In order to enhance the activity of these photosemiconductor compositions, the above photosemiconductor composition can be made to adhere to platinum metals such as platinum, palladium, rhodium and ruthenium, and metals such as silver, copper and zinc. . In this case, 1 to 20% of a metal is appropriately used depending on the activity. Since the photocatalytic activity of the photosemiconductor composition increases as the specific surface area of the particles increases, the average particle size is preferably from 0.005 to 20 μm, particularly preferably from 0.1 to 20 μm.
It is preferably from 01 to 5 μm.

The antibacterial filter of the present invention contains the above-mentioned ACP porous particles and the photosemiconductor composition dispersed in a sheet-shaped base material. The method for producing this antibacterial filter is characterized in that the above A
There is no particular limitation as long as the base material contains the CP porous particles and the photosemiconductor composition. For example, paper, woven fabric, non-woven fabric,
The ACP porous particles and the photosemiconductor composition particles may be added during the production of a substrate such as a plastic foam, or may be bonded to the substrate via an adhesive. Further, a mixture of the ACP porous particles and the photosemiconductor composition particles and the adhesive in advance is sprayed on a base material by spraying or the like,
Printing can also be performed by a screen printing method or a roll coater. In particular, it is preferable to bond and print in such a manner that the ACP porous particles and the photosemiconductor composition particles are exposed on the surface of the substrate. This is effective when the target comes into contact with the surface of the optical semiconductor composition, so that the ACP porous particles are collected by using both the ACP porous particles and the optical semiconductor composition, and the optical semiconductor composition Decomposes, which is efficient.

In the case of bonding via an adhesive, the adhesive is preferably an aqueous adhesive or an organic solvent adhesive containing a curable resin and / or a natural resin soluble in an organic solvent. A combination of these is more preferred. As the aqueous solution type adhesive, an emulsion type adhesive in which a crosslinking agent is used in combination with a curable resin is more preferable. Further, as the organic solvent-type adhesive, one obtained by dissolving a natural resin soluble in an organic solvent in an organic solvent is more preferable. As the curable resin, for example, acrylate resin, polyurethane resin,
Epoxy resins, melamine resins and the like can be mentioned. As a natural resin soluble in an organic solvent, for example, shellac resin,
Examples include copal rubber and dammar rubber. Examples of the crosslinking agent include an isocyanate-based crosslinking agent, an aziridine-based crosslinking agent, an epoxy-based resin, and a melamine-based resin. When a curing agent is used in combination with a crosslinking agent and an epoxy resin is used as the curing resin, a crosslinking agent other than the epoxy resin is used as the crosslinking agent.

When the ACP porous particles and the photosemiconductor composition particles are adhered to a substrate using these adhesives,
The ACP porous particles and the optical semiconductor composition can be used even when the filter is used in a humid environment without lowering the high virus adsorption ability of the amorphous calcium phosphate and the antibacterial effect of the photosemiconductor composition. The substance particles can be effectively prevented from detaching from the base material. Further, a curable resin or a resin in which a crosslinking agent is used in combination can be used after washing the used filter.

The content of ACP in the substrate is 1 to 100 g.
/ m ² , particularly preferably ² to 25 g / m ² . If it is less than 1 g / m ^2, it is difficult to exhibit the adsorbing ability, and if it is more than 100 g / m ² , it is difficult to uniformly adhere to the substrate, and the air permeability tends to be impaired. Further, the content of the photosemiconductor composition in the substrate is preferably ¹ to 200 g / m ² , particularly preferably ² to 50 g / m ² . If it is less than 1 g / m ^2, it is difficult to exhibit an antibacterial effect, and if it is more than 200 g / m ² , it is difficult to uniformly adhere to a substrate, and air permeability is likely to be impaired. The use ratio (weight ratio) between the ACP and the photosemiconductor composition is particularly from 10:90 to 5: 5.
Preferably, it is 0:50.

The antibacterial filter of the present invention described above can be used for an air filter such as an air purifier, an air conditioner, a vacuum cleaner, a fan heater, etc., and exhibits effective adsorption and antibacterial properties. Can be.

[0026]

The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. [Production Example 1] ACP porous particles of the present invention were produced as follows. The apparatus used for producing the ACP porous particles is schematically shown in FIG. In FIG. 1, 9
Is an air filter, and 10 is an electric heater. Hot air heated by the electric heater 10 through the air filter 9 enters the spray dryer 5 from the hot gas chamber 11 and is sprayed by the atomizer 6 of the spray dryer 5. The slurry 3 flows out from the discharge hole 12 toward the cyclone 8 while being dried and granulated.

For the calcium hydroxide suspension under stirring,
A mixed solution was obtained by adding 0.5% by weight of weakly alkaline ammonium triacrylate as a water-soluble polymer dispersant. A phosphoric acid aqueous solution was added dropwise while stirring the obtained mixed solution, and the pH was adjusted to 10 to obtain a particle size of about 0.1 μm.
A slurry containing less than ACP particles was obtained. The obtained slurry was diluted with ion-exchanged water so that the concentration of ACP became 20% by weight.

The slurry 3 containing the ACP particles 1 thus diluted was supplied to an atomizer 6 of a spray drier (L-8 manufactured by Okawara Kakohki Co., Ltd.) 5 by a metering pump 4. The atomizer 6 was rotated at a high speed, and the mixture slurry 3 was sprayed into a hot air stream for drying in the spray dryer 5, and was granulated and dried by a spray granulation drying method. By this granulation and drying, ACP porous particles 7 were obtained.

The obtained ACP porous particles 7 were collected by a cyclone 8. At this time, cyclone 8
The ultrafine powder that could not be collected by the filter was separately collected by a bag filter (not shown).

The operating conditions in the above granulation were as follows. The supply amount of the mixture slurry 3 by the metering pump 4 is 1 to 3 kg / h, and the temperature of the hot air heated by the electric heater 10 through the air filter 9 is 150 to 250 ℃, the outlet temperature at the discharge hole 12 diverging in the cyclone 8 is controlled so as to always exceed 80 ° C., and the rotation speed of the atomizer 6 is 10,000 to
It was set within the range of 37,000 rpm.

The ACP porous particles 7 thus obtained became porous spherical by using the spray granulation method. When the specific surface area of the ACP porous particles 7 was measured by the BET method, the specific surface area was 65.1 m ² / g.

[Production Example 2] Granulation was carried out in the same manner as in Production Example 1, except that the ACP concentration in the slurry in Production Example 1 was adjusted to 40% by weight. The obtained ACP porous particles had a specific surface area of 43 m ² / g or more.

[Production Example 3] A titanium oxide optical semiconductor composition was prepared by mixing titanium oxide having a particle diameter of 5 µm and silver powder having a particle diameter of 2 µm in a ratio of 9: 1.
At a ratio of 1: 1 using a ball mill.

Example 1 An antibacterial filter was produced using the ACP porous particles obtained in Production Example 1 and the photosemiconductor composition particles obtained in Production Example 3. In particular,
Basis weight 30 g / m ² of polyester nonwoven fabric (100 cm × 100 cm)
On the other hand, the following treatment liquid was applied by a screen printing method, and then dried at 130 ° C. for 5 minutes.

Treatment liquid 2 g of ACP porous particles obtained in Production Example 1 Titanium oxide photo-semiconductor composition obtained in Production Example 3 18 g Aqueous acrylate resin aqueous emulsion 100 g Epoxy resin 3 g 123 g in total

Example 2 Using the ACP porous particles obtained in Production Example 1 and the photosemiconductor composition particles obtained in Production Example 3, an antibacterial filter was produced. In particular,
Basis weight 30 g / m ² of polyester nonwoven fabric (100 cm × 100 cm)
On the other hand, the following treatment liquid was applied by a screen printing method, and then dried at 130 ° C. for 5 minutes.

Treatment liquid 6 g of ACP porous particles obtained in Production Example 1 Titanium oxide photo-semiconductor composition obtained in Production Example 14 14 g Aqueous emulsion of acrylate-based resin 100 g Epoxy resin 3 g 123 g in total

Comparative Example 1 An antibacterial filter was prepared using only the photosemiconductor composition particles obtained in Production Example 3. Specifically, the following treatment liquid was applied to a polyester nonwoven fabric (100 cm × 100 cm 2) having a basis weight of 30 g / m ² by screen printing, and then dried at 130 ° C. for 5 minutes.

Treatment liquid Titanium oxide optical semiconductor composition obtained in Production Example 3 20 g Acrylic ester-based resin aqueous emulsion 100 g Epoxy resin 3 g Total 123 g

Comparative Example 2 An antibacterial filter was prepared using only the ACP porous particles obtained in Production Example 1. Specifically, the following treatment liquid was applied to a polyester nonwoven fabric (100 cm × 100 cm 2) having a basis weight of 30 g / m ² by screen printing, and then dried at 130 ° C. for 5 minutes.

Treatment liquid ACP porous particles obtained in Production Example 1 20 g Acrylic ester-based resin aqueous emulsion 100 g Epoxy resin 3 g Total 123 g

Example 3 Using the ACP porous particles obtained in Production Example 1 and the photosemiconductor composition particles obtained in Production Example 3, an antibacterial filter was produced. In particular,
The following treatment liquid was applied by gravure printing to a pulp sheet (100 cm × 100 cm 2) with a basis weight of 50 g / m ² , and then 130
Dry at 5 ° C. for 5 minutes.

Treatment liquid 9 g of the ACP porous particles obtained in Production Example 1 9 g of the titanium oxide photo-semiconductor composition obtained in Production Example 3 21 g of an aqueous emulsion of an acrylate resin 100 g 0.2 g of citric acid 130.2 g in total

Test Example 1 The filters (samples 1 to 3) prepared in Examples 1 to 3 were subjected to a virus inactivation test. As a control, T which is frequently used as a fungicide
Filter impregnated and dried in BZ (thiabendazole) (commercially available as replacement unit) (Sample 4)
It was used. The test was performed as follows.

Test outline 0.2 ml of the influenza virus suspension was dropped on a test piece cut into a size of about 3 cm × 3 cm, and the test piece was irradiated with a fluorescent lamp.
Stored in ° C. After 6 hours of storage, the virus on the test piece was washed out, and the virus infectivity in the wash solution was measured.

Test method 1) Test virus Influenza virus type A (H1N1) 2) Cell used MDCK (NBL-2) cell ATCC CCL-34 strain [Dainippon Pharmaceutical Co., Ltd.]

3) Medium Used A cell growth medium obtained by adding 10% of newborn calf serum (ICN) to Eagle MEM (Nippon Pharmaceutical Co., Ltd., containing 0.06 mg / ml kanamycin) was used. Cell maintenance medium A medium having the following composition was used. Eagle MEM 1,000 ml 7.0% NaHCO ₃ 32 ml L-glutamine (29.2 g / L) 10 ml 100 × Vitamin solution for MEM 30 ml 10% albumin 20 ml Trypsin (5 mg / ml) 2 ml

4) Preparation of Virus Suspension Culture of Cells MDCK cells were monolayer cultured in a tissue culture flask using a cell growth medium. Inoculation of virus After the monolayer culture, the cell growth medium was removed from the flask, and the virus was inoculated. Next, a cell maintenance medium is added, and 3 to 5 in a carbon dioxide gas incubator (CO ₂ concentration: 5%) at 34 ° C.
Cultured for days.

Preparation of Virus Suspension After culturing, the morphology of the cells was observed using an inverted phase-contrast microscope, and it was confirmed that morphological changes (cytopathic effect) had occurred in 80% or more of the cells. Next, after performing freeze-thawing once, the culture solution was centrifuged (3,000 rpm, 10 minutes), and the obtained supernatant was used as a virus suspension.

5) Preparation of Test Piece After cutting the sample into a size of about 3 cm × 3 cm,
The sample was subjected to wet heat sterilization for 5 minutes to obtain a test piece.

6) Inoculation and preservation of virus A test piece was placed in a plastic petri dish, and a virus suspension was
After dropping 0.2 ml, the solution was covered and stored at 25 ° C. in the dark. The same test was performed using a plastic petri dish (without a test piece) as a control.

7) Washing out virus After 6 hours of storage, the virus suspension on the test piece was washed out with 2 ml of cell maintenance medium. 8) Measurement of virus infectious titer After using a cell growth medium, MDCK cells were cultured in a monolayer in a tissue culture microplate (96 wells). Then, the cell growth medium was removed, and 0.1 ml of a virus isolation medium was added. Next, 0.1 ml of the washing solution and its diluent were inoculated into each of four wells, and
The cells were cultured in a carbon dioxide gas incubator (CO ₂ concentration: 5%) at 5 ° C. for 5 days. After culturing, the cells were observed for morphological changes (cytopathic effect) using an inverted phase contrast microscope, and
The 50% tissue culture infectious dose (TCID ₅₀ ) was calculated by the -Muench method and converted to the virus infectious titer per 1 ml of the washing solution. Test results Table 1 shows the test results.

[0053]

[Table 1]

As is evident from Table 1, the influenza virus showed a two-digit spontaneous reduction in 6 hours, but the filter of the present invention (samples 1 to 3) showed a five-digit or more reduction effect. Was. On the other hand, the TBZ-impregnated filter (Sample 4) had no antiviral effect.

Test Example 2 Since the titer of λ phage (a virus that infects Escherichia coli and kills the bacterium) can be measured very accurately, in this test example, the effectiveness of an antibacterial (antivirus) filter using the λ phage was evaluated. Sex was examined. The test was performed as follows.

First, λ phage was cultured, and a density gradient was formed by an ultracentrifuge by the CsCl method and purified (about 2 × 10 ^12).
/ Ml). This was diluted with SM buffer, and about 2 × 10 ⁷ /
ml. Samples 1 to 4 similar to Test Example 1 and the filter (Sample 5) prepared in Comparative Example 1 and the filter (Sample 6) prepared in Comparative Example 2 were each aseptically placed in a glass test tube. λ phage solution (about 2 × 10 ⁷
/ Ml) was closed and closed. As a control, a λ phage solution (about 2 × 10 ⁷ / ml) alone without a test piece was used.
1.5 ml was used. After leaving these glass test tubes under fluorescent light at room temperature for 20 hours, the titer of the λ phage solution was measured as follows.

E. coli BNN45 was added overnight to a λ broth solution (10 g of bactotryptone (manufactured by DIFFCO) and 2 g of Na).
Cl (Wako Pure Chemical Industries, Ltd.) dissolved in 1 liter of water)
And diluted 5-fold with SM buffer. 0.2 ml of the obtained E. coli diluent, 10 ml of SM buffer (mainly NaCl, MgCl ₂ , gelatin (each manufactured by Wako Pure Chemical Industries, Ltd.) dissolved in water and sterilized) in a glass tube For 10 minutes at 37 ° C. and spread on a λ plate. Virus titers were counted by the number of plaques formed. Table 2 shows the results. Note that a difference of three times or more is considered significant.

[0058]

[Table 2]

As is clear from Table 2, the effect of the sample 6 using only the ACP porous particles and the sample 5 using only the photosemiconductor composition particles were observed as compared with the control.
When using CP porous particles and optical semiconductor composition particles,
The synergistic effect shows an improvement in antibacterial properties. AC
In sample 2 having a large amount of P porous particles, a remarkable antibacterial effect was observed. On the other hand, TBZ impregnated filter (sample 4)
Shows almost no virus inactivating effect.

Test Example 3 The filters (samples 1 and 2) prepared in Examples 1 and 2 were subjected to an adsorption test for NOx (NO ₂ ). In addition, an adsorption test was performed using the polyester nonwoven fabric used in Example 1 which was not treated as a control (sample 3). The test was performed as follows.

Test Overview The above sample was placed in a 3-liter Tedlar bag and sealed. After that, fill the following test gas, every elapsed time,
The residual concentration of the test gas was measured. In addition, a sample containing no sample was used as a control.

Test gas: NO ₂ residual gas concentration 10 ppm (N ₂ balance) Specimen consumption: Specimen 1: 30 × 15 cm Specimen 2: 30 × 15 cm Test temperature: room temperature Verification method: Detection tube method NO, 9 L (manufactured by Gastec) Table 3 shows the results.

Filters of Examples 1 and 2 (Samples 1 and 2)
Indicates that the NO ₂ concentration is so low that it cannot be measured after 1 Hr compared to the control (sample 3). The filter with a large amount of ACP porous particles (sample 2) has a higher NO ₂ adsorption capacity than the filter with a small amount of ACP (sample 1). Since filters in this application has an effect of removing NO _X which is said to be one of the causes of asthma and bronchitis,
Significant effects are expected when used in air purifiers.

[0064]

[Table 3]

[0065]

According to the antibacterial filter of the present invention, excellent antibacterial properties are exhibited by using an amorphous calcium phosphate having a high adsorption capacity for bacteria and viruses in combination with an optical semiconductor composition. Can be. Further, the antimicrobial filter of the present invention it is possible to effectively remove NO _X which is said to be one of the causes of asthma and bronchitis, air cleaner, air conditioning, can be effectively used as a filter of the cleaner, etc. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus used for producing ACP porous particles.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... ACP primary particle 3 ... Slurry 4 ... Metering pump 5 ... Spray dryer 6 ... Atomizer 7 ... ACP porous particle 8 ... Cyclone 9 ... Air filter 10 ... Electric heater 11 ... Hot gas chamber 12 ... Discharge hole

Claims (4)

[Claims] 1. An antibacterial filter comprising an amorphous calcium phosphate and an optical semiconductor composition dispersed in a base material formed into a sheet. 2. An antibacterial filter comprising an amorphous calcium phosphate and an optical semiconductor composition adhered to a sheet-shaped substrate via an adhesive. 3. The sheet-shaped base material is paper,
The antibacterial filter according to claim 1, which is a woven fabric, a nonwoven fabric, or a plastic foam. 4. The antibacterial filter according to claim 2, wherein the adhesive is an adhesive containing a curable resin and / or a natural resin soluble in an organic solvent.