JP2005144201A - Filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and efficient filter unevenly coated with a cleaning agent such as an extracted component or the like of a bamboo or bamboo grass having antibacterial and antiviral properties, keeping a cleaning effect and having air permeability. <P>SOLUTION: This filter includes the cleaning agent and cloth or a nonwoven fabric, and the air suction resistance of the filter is 0.1-5.0 mm H<SB>2</SB>O. The cleaning agent is unevenly present on the inside and outside of the filter and the uneven distribution ratio (ΔE inside/ΔE outside ratio) using a color difference ΔE of the cleaning agent is 0.50-0.85. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a filter that maintains the cleaning effect efficiently and has good air permeability by applying an uneven distribution of a detergent such as bamboo or cocoon extract components having antibacterial and antiviral properties.

Since the filter exists in the air circulation path, it is pointed out that if bacteria adhere to the filter and propagate, the surrounding area is contaminated with bacteria.
For example, the mask is used to prevent foreign matter from being taken into the body from the outside by covering the mouth and nose. When a mask is worn for a long time, fungi attached to the mask grow, and recently, a mask having antibacterial properties has been demanded.
In the present invention, fungi such as bacteria and fungi, and microorganisms such as viruses are referred to as fungi.

  In general, bacteria are killed by organisms that make up proteins that have taken up nutrients, and when antibiotics are administered, bacteria are known to take up with nutrients and die due to their toxicity. It is designed to be easily imported. Viruses, on the other hand, are protein shells and particles that have only genetic information in them. Parasites on animal cells continue to grow and break down, causing inflammation and disease. However, the virus is not effective because it does not take up antibiotics, and if you try to beat it with a strong drug, it will kill the cells. Vaccines aimed at prevention are effective against viral infections. If you immunize against a virus by injecting a weakened virus, it will be difficult to infect. Therefore, bacteria and viruses clearly have different killing mechanisms.

  On the other hand, it has been found that the extract of Kumazasa is effective for antibacterial and antitumor measures (see Patent Document 1). However, it has been found that Kumazasa extract components are effective in protecting both bacteria and viruses. Thus, there are no other known materials that are effective in inhibiting the growth of a wide range of microorganisms such as fungi, fungi such as bacteria, and viruses.

For example, when a detergent solution such as bamboo or bamboo extract is applied to a filter in the usual way, the detergent solution is applied by infiltrating the eyes of a cloth or nonwoven fabric, resulting in clogging. The air permeability is poor. In order to avoid this, when the coating amount was controlled, there was a problem that the cleaning effect could not be sufficiently exhibited.
WO99 / 62444 pamphlet.

The present invention is simple, and by applying a detergent such as bamboo or cocoon extract component having antibacterial and antiviral properties in an uneven distribution, it is efficiently maintained with a cleaning effect and good air permeability. An object is to provide a simple filter.
Another object of the present invention is to provide a filter that is highly safe for the environment and living organisms because it is derived from natural products using bamboo or bamboo extract components.

  When a bamboo or straw extract component liquid is applied to a cloth or non-woven fabric and used as a filter, the antibacterial and antiviral effects are diminished if applied uniformly and thinly over the entire thickness of the cloth or non-woven fabric. However, antimicrobial efficacy and air permeability as a filter can be secured by carrying more components on the outer side and making them unevenly distributed, which is effective in protecting bacteria and increasing the antimicrobial effect. As a result, the present invention has been achieved.

The present invention is a filter comprising a detergent and a cloth or nonwoven fabric,
Intake resistance of the filter, a range of 0.1~5.0mmH ₂ O, and,
The cleaning agent is unevenly distributed between the inside and outside of the filter, and the uneven distribution rate using the color difference ΔE (
The present invention relates to a filter having a ΔE inner / ΔE outer ratio) of 0.50 to 0.85.

  Moreover, this invention relates to the filter formed by apply | coating the detergent solution whose viscosity when measured with a B-type rotational viscometer is 20-200 mPa * s on the single side | surface of cloth or a nonwoven fabric.

  Moreover, this invention relates to the said filter in which a cleaning agent contains the extraction component of bamboo or a bamboo grass.

  Moreover, this invention relates to the said filter whose filter is a mask.

  The present invention also relates to the above filter, wherein the filter is an air cleaning filter.

  The present invention also relates to a method for producing a filter, wherein a detergent solution having a viscosity of 20 to 200 mPa · s as measured with a B-type rotational viscometer is applied to one side of a cloth or nonwoven fabric.

  According to the present invention, it is simple, and by applying a detergent such as an extract component of bamboo or cocoon having antibacterial and antiviral properties unevenly distributed, it is efficiently maintained with a cleaning effect and good air permeability. A simple filter can be provided.

  The filter referred to in the present invention is an air permeable film for removing foreign substances such as bacteria in the air that exist in the air flow path. For example, a mask, an air cleaner, an air conditioner, a vacuum cleaner, a ventilation fan Filter.

  The detergent referred to in the present invention is used for the purpose of cleaning the filter, and is used for the purpose of reducing or eliminating inconveniences derived from bacteria such as antibacterial and deodorizing. Specifically, antibacterial agents, bactericides, deodorants, fragrances and the like may be used, and mixtures thereof may be used.

The detergent used in the present invention is a detergent liquid and is applied with a cloth or nonwoven fabric as a substrate. Solid materials are used as a solution in a solvent. As the solvent, a normal solvent is used, for example, water,
Hydrocarbons such as hexane, octane, cyclohexane,
Alcohols such as methanol and ethanol,
Ketones such as acetone and methyl ethyl ketone,
Esters such as ethyl acetate, butyl acetate, ethyl propionate,
Aromatics such as benzene, toluene, xylene,
Halogenated solvents such as dichloroethane and trichloroethane,
Solvents such as ethers such as diethyl ether and tetrahydrofuran are used.

Bamboo or cocoon used in the present invention refers to a plant belonging to the family Gramineae. Among them, there are 10 genera such as Mushroom, Narihirada, Tochiku, Okamezasa, Sasa, Azumaza, Yadatake, Medaka, Kanchiku, Horaichiku, and others. Kinmeichiku, Kurochiku, Hoteiiku, Yadatake, Narihiradatake, Suzunarihira, Tochiku, Shibuchichiku, Okamesasa, Oroshimachiku, Azuma Nesasa, Kamurozasa, Miyakozasa, Tanna Sazasa, Furishiya, Kogazasa, Honigakusa
Among them, Kumazasa is a suitable example.

  Regarding the extract components of bamboo or bamboo shoots, it is presumed that they contain a lot of lignin and polysaccharides, and the components are complicated and not always clear.

  The Kumazasa extract component is a component mainly composed of “Sasa glycoside” extracted from Gramineae Kumazasa. The “sasa glycoside” uses pentoses (pentoses) such as xylose and arabinose, and hexoses (hexoses) such as galactose and glucose as structural monosaccharides.

  The bamboo or bamboo extract component can be obtained as a bamboo or bamboo extract by immersing bamboo or bamboo in an extraction solvent such as water or alcohol. It can also be obtained as a commercial product. Bamboo or bamboo shoot extract can be appropriately diluted with water and used.

  The bamboo or bamboo extract used in the present invention is preferably obtained by, for example, extracting fresh or dried leaves of bamboo or bamboo, preferably dried leaves, with water at 60 to 130 ° C. under normal pressure or pressure.

  Although the extraction method is not particularly limited, for example, the method described in Japanese Patent No. 312278 can be used.

  In addition, the bamboo or straw extract can be once powdered by spray drying, freeze drying, addition of a shaping agent such as dextrin, and the like. Further, it may be subjected to a selection process such as filtration, column purification, solvent washing, solvent extraction and the like.

When the bamboo or bamboo extract component is used as an antibacterial liquid, it is preferably used at a concentration higher than that conventionally used. The solid content of the bamboo or bamboo extract component contained in the liquid is 1 to 50. It is preferable to use it by weight%. Bamboo or bamboo extract components exhibit antibacterial properties against various fungi, such as Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, tetanus, Clostridium gas gangrene, Candida, ringworm, mold, Kumonosukabi, Aspergillus, Cryptococcus, Coccidioides, Histoplasma,
It can be expected to exhibit antibacterial properties against bacteria or viruses such as herpesvirus and coronavirus.

  The antibacterial material of the present invention can be used as an extract or dissolved or dispersed in various solvents or water. Furthermore, if necessary, other antibacterial materials, various additives such as moisturizers, colorants, viscosity modifiers, emulsifiers, dispersants, ultraviolet absorbers, antioxidants, fragrances, etc. may be added. Also good.

Examples of other antibacterial agents include silver-based and copper-based inorganic and organic antibacterial agents.
The moisture retaining material is not particularly limited as long as it is generally hygroscopic. Representative examples include those having a hydroxyl group or a carboxylic acid group in the resin system, such as acrylic acids, glycols such as polyethylene glycol, water-based urethane resins, polyvinyl alcohol resins, polyvinyl pyrrolidone, polyethylene oxide, Examples include polyester resins having a polyethylene glycol chain, polyurethane resins having a polyethylene glycol chain, and water-absorbing acrylic resins.

  Although it does not specifically limit as a coloring agent, The pigment | dye recognized as food additives, such as food pigment | dye and chlorophyll, is desirable.

  Examples of the viscosity modifier include known resins and waxes such as acrylic resin, polyvinyl acetate and its saponified product, polyester, and polyether. Use of a resin or the like can be expected to have an effect of blocking the supply of water, oxygen, and nutrient sources from the outside, which promotes the growth of bacteria, and an effect of suppressing the extraction of bamboo or bamboo extract from the base material.

  Other emulsifiers, dispersants, ultraviolet absorbers, antioxidants, fragrances and the like are not particularly limited, but those having no problem or little influence on the human body are desirable.

  In the present invention, the antibacterial effect and the air permeability as a filter can be ensured by applying the bamboo or cocoon extract to a base material such as a cloth or a non-woven fabric, which is effective in protecting bacteria. The antibacterial effect is increased.

  Since the detergent liquid of the present invention has a specific viscosity, when the detergent liquid is applied, the detergent liquid forms a detergent layer without permeating the entire cloth or nonwoven fabric as a base material, As a result, the detergent layer can be unevenly distributed.

The air permeability useful as a filter and a mask is expressed as an inhalation resistance in JIS, and is usually in the range of about 0.05 to about 13 mmH ₂ O for a disposable type and a dustproof type. The intake resistance represents a resistance value when air is supplied to the filter and mask to the intake side of 40 liters per minute. Filter and masks having antimicrobial properties of the present invention is in the range of 0.1~5.0mmH ₂ O, 0.1mmH thin detergents layer at ₂ O or less, can not be sufficiently exhibited antimicrobial properties. On the other hand, when the thickness is 5.0 mmH ₂ O or more, the detergent layer is sufficient, but the air permeability is deteriorated and the original functions of the filter and the mask are lowered, and at the same time, the antibacterial effect is not exhibited.

  Usually, bamboo or bamboo extract is colored brown or green, so that it is possible to use color difference as an indicator of uneven distribution.

In order to more effectively express the function of the filter, it is applied unevenly on the substrate inside and outside the filter to be used, and when the color difference ratio (ΔE inside / ΔE outside) is defined as the uneven distribution ratio, 0.5
It is desirable to be in the range of 0 to 0.85. If it is 0.50 or less, the detergent layer is thin and antibacterial properties are not sufficiently exhibited. On the other hand, if it is 0.85 or more, the detergent layer is sufficient, but the air permeability is deteriorated and the original functions of the filter and the mask are lowered, and at the same time, the antibacterial effect is not exhibited.

The color difference ΔE represents the color difference between the L, a, and b values of the base material before application of the detergent and the L, a, and b values after application, and can be measured, for example, with a color difference meter.

With a B-type rotational viscometer, the viscosity of the detergent solution applied to a substrate such as cloth or nonwoven fabric is 20 to
The thing of the range of 200 mPa * s is desirable. If it is 20 mPa · s or less, the viscosity is too low and the coating amount does not reach the target amount, and at the same time, the detergent solution has high permeability to the base material, making it difficult to make it unevenly distributed, and the antibacterial effect is not sufficiently exhibited. On the other hand, if it is 200 mPa · s or more, the viscosity is too high to obtain the intended filter.

The filter of the present invention is usually obtained by applying and impregnating bamboo or straw extract components to a substrate having air permeability such as nonwoven fabric, cloth, paper, and porous plastic.
Nonwoven fabrics used here are in the form of polyester, rayon, vinylon, polypropylene, nylon, acrylic, aramid, etc., paper, cotton, etc. It is what

  As a coating method, it is possible to apply to the substrate by various coating methods such as brush, dipping, roller, spray, pouring, and coating machine. Examples of the coating method include dip coating, comma coating, gravure coating, curtain coating, die coating, lip coating, micro gravure coating, slot die coating, reverse coating, and kiss coating.

The coating amount is the solid content of the extracted component of bamboo or bamboo shoots, and is preferably applied in an uneven distribution of 0.1 to 150 g per 1 m ² of the base material. 5 to 100 g is particularly desirable. Here, the content (solid content) of the extracted component of bamboo or straw in a general nonwoven fabric is 25% by weight or more. When this amount is large, the antibacterial effect is high, but it is not very economical. If the coating amount is too small, the antibacterial effect is reduced.

  When used as a mask, normal use forms can be directly applied to the present invention, for example, a filter alone made of a nonwoven fabric or cloth coated with the antibacterial and antiviral materials of the present invention, paper, porous plastic, etc. A method of sandwiching between mouths, a method of putting this filter in the pocket with a pocket mask, a method of attaching an adhesive to one side of the filter and pasting it to the mask (inner bonding / outer bonding), The mask may also have a laminated structure combined with other non-woven fabrics, cloths, nets, sheets, gauze, and the like.

<Manufacture of Kumazasa Extract>
The dried leaves of Kumazasa collected in September in the Teshio Mountains of Hokkaido are placed in a pressurized hot water tank, treated at 125 ° C for 10 minutes, cooled with cooling water to 80 ° C, and the extract and water-containing solids are screw pressed. The water content was about 50% by weight. Next, about 50% by mass of water-containing solid content was put in an autoclave and subjected to pressurized hot water treatment with saturated steam at 180 ° C. for 10 minutes. The treated water-containing solid content was again placed in a pressurized hot water extraction tank and treated at 110 ° C. for 5 minutes to extract the extract. The first and second extracts were combined, filtered through diatomaceous earth, concentrated under reduced pressure to a solid content of 50% by weight, and subjected to a fluid sterilization treatment at 110 to 130 ° C. to obtain a kumazasa extract.

Example 1
A coating liquid (measured with a B-type rotational viscometer) in which the above-mentioned Kumazasa extract, 20% polyethylene oxide aqueous solution as a humectant, and 65% isopropyl alcohol aqueous solution as a viscosity modifier were mixed at 6: 5: 9 (weight ratio). When the filter is used, the non-woven fabric having a weight of about 150 mPa · s) with 100% cotton and a basis weight of 60 g / m ² , an intake resistance of 1.2 mmH ₂ O at a coating amount of 100 g / m ² / dry An antibacterial filter having an uneven distribution rate of inside and outside of 0.73 was obtained. A comma coater was used for coating.
The color difference was measured using CHROMA METER CR-200 manufactured by MINOLTA.

<Antimicrobial test 1>
The obtained antibacterial filter was cut into a circle having a diameter of about 2 cm and placed in a petri dish as a test piece. 0.1 ml of a bacterial culture solution having about 300,000 cells / ml of Escherichia coli NBRC 3972 was dropped onto the test piece on which the Kumazasa extract was applied. The petri dish lid was closed and stored for 19 hours at 35 ° C. and 90% relative humidity. The test piece was washed out with 1.9 ml of sterilized physiological saline to obtain a recovered solution. When this recovered solution was cultured on a normal agar medium at 35 ° C. for 24 hours by the pour plate culture method and the number of viable bacteria was measured, no bacteria were detected.

<Antimicrobial test 2>
A 30 cm square acrylic plate was drilled with a 10 cm diameter hole in a cubic box assembled. Two boxes were prepared and set so that the holes just overlapped. The obtained antibacterial filter was cut into a circle having a diameter of 12 cm and sandwiched between the boxes. At this time, packing was put between the antibacterial filter and the acrylic plate so as not to leak air, and two acrylic cubes sandwiching the antibacterial filter were firmly bonded.
10 ml of a bacterial culture solution having approximately 300,000 cells / ml of Escherichia coli IFO 3972 was placed in a petri dish, placed in a box on one side in an open state, and air of 5 cubic m / min was sent in. On the other side, the nonwoven fabric used in Example 1 was placed and stored for 24 hours at 35 ° C. and 90% relative humidity.
The obtained test piece was washed out with 1.9 ml of sterilized physiological saline to obtain a recovered solution. When this recovered solution was cultured on a normal agar medium at 35 ° C. for 24 hours by the pour plate culture method and the number of viable bacteria was measured, no bacteria were detected.

Comparative Example 1
The same nonwoven fabric and coating liquid as in Example 1 (viscosity when measured with a B-type rotational viscometer is about 10 mPa · s) with an application amount of 0.08 g / m ² / dry and an intake resistance of 0.08 mmH ₂ O, An antibacterial filter of 1.05 was obtained in the uneven distribution rate between the inside and the outside when the filter was used. The antibacterial test 1 was carried out in the same manner as in Example 1 and the number of viable bacteria was measured. As a result, it was about 50,000,000 cells / ml, and no antibacterial activity was observed.

Comparative Example 2
The same non-woven fabric and coating liquid as in Example 1 (viscosity when measured with a B-type rotational viscometer is about 630 mPa · s) are applied at 200 g / m ² / dry and the intake resistance is 6.2 mmH ₂ O. An antibacterial filter having an uneven distribution rate between the inside and outside when used was 0.32.
When the antibacterial test 1 was carried out in the same manner as in Example 1 and the number of viable bacteria was measured, no bacteria were detected.
Next, when the antibacterial property test 2 was carried out using the same filter, the air permeability was poor and the pressure of the blow pump gradually increased, and accurate data could not be obtained.

Example 3
<Antiviral test>
On a flat-bottomed microplate, the above-mentioned nonwoven kumazasa preserved and dried in a maintenance medium (Eagle MEM medium containing 2% bovine serum albumin) containing a HeLa cell suspension and RS (Respiratory Syncytial) virus Long strain previously prepared by trypsin digestion. The side to which the extract was applied was brought into contact and centrifuged (700 × g) at room temperature for 5 minutes, and then cultured in a carbon dioxide incubator at 35 ° C. for 5 days. After completion of the culture, the nonwoven fabric and the like are removed, the MTT method (MTT: 3- (4,5-dimethylthiazol-2-yl) -2,5-diphenyltetrazolium bromide) is performed, and the ratio of viable cells is colorimetrically determined. The inhibitory action of cell destruction by RS virus infection was evaluated.
The ratio of viable cells was almost 0% in the case of the nonwoven fabric alone, while that of Example 1 and Comparative Example 2 was 90% or more, and that of Comparative Example 1 was about 10%. Differences in effects were observed depending on the amount of application of the components and the application method.

Claims (6)

A filter comprising a detergent and a cloth or non-woven fabric,
Intake resistance of the filter, a range of 0.1~5.0mmH ₂ O, and,
The cleaning agent is unevenly distributed between the inside and outside of the filter, and the uneven distribution rate using the color difference ΔE (
A filter having a ratio of ΔE inside / ΔE outside) of 0.50 to 0.85.   A filter obtained by applying a detergent solution having a viscosity of 20 to 200 mPa · s as measured with a B-type rotational viscometer to one side of a cloth or nonwoven fabric.   The filter according to claim 1 or 2, wherein the cleaning agent comprises an extraction component of bamboo or bamboo.   The filter according to claim 1, wherein the filter is a mask.   The filter according to claim 1, wherein the filter is an air cleaning filter.   A method for producing a filter, wherein a detergent solution having a viscosity of 20 to 200 mPa · s as measured with a B-type rotational viscometer is applied to one side of a cloth or nonwoven fabric.