JP2014050790A - Antibacterial deodorant filter medium, method for manufacturing antibacterial deodorant filter medium, and antibacterial deodorant filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antibacterial deodorant filter medium having electric charge characteristics and excellent in antibacterial and deodorizing effects, and its manufacturing method, and to provide an antibacterial deodorant filter.SOLUTION: An antibacterial deodorant filter medium includes a filter medium having a collection layer made of a nonwoven fabric subjected to electret treatment, and antibacterial agent of 0.8×10-1.6×10g/mand surface active agent which are held by the filter medium.

Description

  The present invention relates to an antibacterial deodorant filter material, a method for producing an antibacterial deodorant filter material, and an antibacterial deodorant filter.

  2. Description of the Related Art Conventionally, a filter medium used for an air filter is known which is made of an electret-treated non-woven fabric (hereinafter also referred to as an electret non-woven fabric). The electret nonwoven fabric has the collection performance inherent to the filter medium, but the collection performance is further improved by the action of static electricity. Hereinafter, the collection performance improved by the action of static electricity is referred to as charging performance. As a conventional filter medium made of an electret nonwoven fabric, an antibacterial agent such as an antibody is carried on the electret nonwoven fabric and further has antibacterial performance (for example, see Patent Documents 1 to 3).

Japanese Patent No. 4801690 Japanese Utility Model Publication No. 6-57412 Japanese Patent Laid-Open No. 62-42715

  An object of this invention is to provide the antibacterial deodorizing filter material excellent in the antibacterial deodorizing property, maintaining its charging performance, its manufacturing method, and an antibacterial deodorizing filter.

  As a result of extensive research, the present inventor has found that the antibacterial and deodorant properties can be sufficiently exhibited without impairing the charging performance by supporting the surfactant on the electret filter medium together with a predetermined amount of the antibacterial agent. Was completed.

That is, one embodiment of the present invention is
A filter medium including a collection layer made of a nonwoven fabric subjected to electret treatment;
An antibacterial deodorizing filter medium comprising an antibacterial agent 0.8 × 10 ^{−5 to} 1.6 × 10 ⁻⁵ g / m ² and a surfactant carried on the filter medium.

Another embodiment of the present invention is as follows.
An electret treatment step of obtaining a trapping layer by applying an electret treatment to the nonwoven fabric;
Chemical solution adhesion containing an antibacterial agent and a surfactant, and a chemical solution having a concentration of the surfactant of 0.1 to 2.0% by mass is attached to the filter medium including the collection layer by 10 to ²⁰ g / m ^2. Process,
A solvent removing step of removing the solvent of the chemical solution after the chemical solution attaching step,
After the solvent removal step, the filter medium is a method for producing an antibacterial and deodorant filter medium that carries the antibacterial agent at 0.8 × 10 ^{−5 to} 1.6 × 10 ⁻⁵ g / m ² .

Furthermore, another aspect of the present invention provides:
An antibacterial deodorizing filter attached to a mounting frame having an opening,
A filter pack formed by pleating the antibacterial deodorant filter medium and holding a gap between two adjacent pleats formed on the antibacterial deodorant filter medium;
Storing the filter pack, and a frame disposed in the opening of the attachment frame,
A flange that can be locked to the opening of the mounting frame is formed on the outer periphery of the frame.
It is an antibacterial deodorizing filter.

  According to the present invention, the antibacterial and deodorant filter medium exhibits excellent antibacterial and deodorant performance while maintaining charging performance.

It is a figure which shows the cross section of the antibacterial deodorizing filter material of one Embodiment of this invention. It is a flowchart explaining the manufacturing method of the antibacterial deodorizing filter material of one Embodiment of this invention. It is a figure which shows the external appearance of the antibacterial deodorizing filter of one Embodiment of this invention. It is a figure which shows the state in which the antibacterial deodorization filter of one Embodiment of this invention was attached to the attachment frame. It is a figure which decomposes | disassembles and shows the fixing mechanism of the antibacterial deodorizing filter shown in FIG. FIG. 6 is a diagram showing the fixing mechanism shown in FIG. 5 as viewed from the front. It is a figure which shows the latching state of the fixing mechanism of the antibacterial deodorizing filter shown in FIG. It is an external view which shows the securing member of the fixing mechanism of the antibacterial deodorizing filter of other embodiment of this invention. (A) is an external view which shows the filter pack of the antibacterial deodorizing filter of other embodiment of this invention. (B) is an external view which shows the frame in which the filter pack shown to (a) is accommodated. (C) is an external view which shows the antibacterial deodorizing filter which accommodated the filter pack shown to (a) in the frame shown to (b), and was further fixed by the fixing mechanism.

Hereinafter, the antibacterial deodorizing filter material, the method for producing the antibacterial deodorizing filter material, and the antibacterial deodorizing filter of the present invention will be described in detail.
(Anti-bacterial deodorant filter media)
In FIG. 1, the thickness direction cross section of the antibacterial deodorizing filter material 1 by one Embodiment of this invention is shown.
The antibacterial deodorizing filter medium 1 includes a filter medium 2, an antibacterial agent and a surfactant (not shown).

The filter medium 2 includes a collection layer 3. The collection layer 3 is made of a nonwoven fabric that has been subjected to electret treatment.
As the nonwoven fabric used for the collection layer 3, for example, a melt blown nonwoven fabric is used. For example, the melt blown nonwoven fabric is formed by extruding a molten resin composition to form a fine resin flow, and contacting the resin flow with a high-speed heated gas to form discontinuous fibers having a fine fiber diameter. It is formed by accumulating. The basis weight of the melt blown nonwoven fabric is 5 to 100 g / m ² , preferably 10 to 80 g / m ² . The fiber diameter is 0.1 to 10 μm, preferably 1 to 6 μm, and the average fiber length is 50 to 200 mm, preferably 80 to 150 mm.

Examples of the material for the melt blown nonwoven fabric include polyethylene copolymers such as polyethylene, ethylene-propylene copolymer, ethylene-butylene copolymer, and ethylene-octene copolymer, and polyolefins such as polypropylene or propylene copolymer and polybutylene. Polyamide such as 6-nylon, 66-nylon, 6.66 copolymer polyamide, 610-nylon, 11-nylon, 12-nylon or the like, or copolyamide, polyethylene terephthalate, ethylene terephthalate copolymer, polybutylene terephthalate, etc. , At least one polymer selected from aliphatic polycarbonate, polyurethane elastomer, polyvinyl chloride or copolymer, wholly aromatic polyester, polyphenylene sulfide, and the like. Among these, polypropylene is preferable because it is excellent in melt blow moldability, is low in cost, and has a very low possibility of mixing polymer balls that do not become fibers called shots during the production of the melt blown nonwoven fabric.
The electret treatment is performed, for example, as described in a method for producing an antibacterial deodorizing filter material described later.

The filter medium 2 further includes a reinforcing layer 5 laminated on the collection layer 3. The reinforcing layer 5 is a sheet having high air permeability and higher rigidity than the collection layer 3, and is preferably easily deformed, thin, and light. For the reinforcing layer 5, a woven or non-woven fabric made of a synthetic resin such as paper, polyethylene terephthalate, or nylon, a net, or the like can be used. As the nonwoven fabric, for example, a spunbond nonwoven fabric can be used. When the nonwoven fabric of the collection layer 3 is a melt blown nonwoven fabric, the nonwoven fabric of the reinforcing layer 5 is preferably a spunbond nonwoven fabric. A known spunbond nonwoven fabric can be used without particular limitation. For example, a spunbond nonwoven fabric in which filaments that are spun and stretched are randomly accumulated on a porous support is used. Such a spunbonded nonwoven fabric is preferable in that it is excellent in strength because it consists of continuous filaments and has been given molecular orientation by stretching. Examples of the material of the spunbonded nonwoven fabric include polyester, polypropylene, and polyamide. In this embodiment, polyester is used. The spunbonded nonwoven fabric may further be intertwined with fibers by means such as needle punching, air suction, water jet and the like. Basis weight of the spunbonded nonwoven fabric, from the viewpoint of the reinforcing property and airflow resistance, 10 to 100 g / ^{m 2,} preferably 15 to 50 g / ^{m 2.} The fineness of the filament is preferably 1 to 3 denier.
The reinforcing layer 5 may be laminated on one side or both sides of the collection layer 3. Lamination | stacking of the collection layer 3 and the reinforcement layer 5 is performed as demonstrated by the manufacturing method of the antibacterial deodorizing filter material mentioned later, for example.

The antibacterial agent and the surfactant are supported on the filter medium 2.
As the antibacterial agent, those having antibacterial properties and deodorizing properties are preferably used. As an antibacterial agent having antibacterial and deodorizing properties, for example, by mass ratio, iron 0.0001 to 0.02, aluminum 0.0002 to 0.02, titanium 0.0000008 to 0.000004, and potassium 0.000002 to A metal composition containing 0.002 may be mentioned.
According to this metal composition, transition element components such as iron and titanium act on water molecules in the air to generate hydroxyl radicals and hydrogen peroxide, which play a major role in the decomposition reaction. The hydroxyl radical is generated via Further, superoxide ions are also generated from the hydrogen peroxide solution via hydroperoxyl radicals, which also contribute to the decomposition reaction. In the present invention, the antibacterial effect is that the oxidizing power of these radicals and ions is effective against bacteria, such as Staphylococcus aureus, pneumoniae, methicillin-resistant Staphylococcus aureus (MRSA), Pseudomonas aeruginosa, Bacillus subtilis, It is thought to be obtained by suppressing the growth of bacteria such as Legionella and Escherichia coli.
Further, in the present invention, the deodorizing effect is due to the bacteriostatic action in which the above-mentioned metal composition inhibits the growth of Staphylococcus aureus that uses skin cells (paste), sweat, oil, etc. generated from the human body as nutrients. Therefore, it is considered that S. aureus can be obtained by preventing the generation of malodor caused by decomposing leucine contained in human keratin waste.

The antibacterial agent is supported on the filter medium 2 by 0.8 × 10 ^{−5 to} 1.6 × 10 ⁻⁵ g / m ² . The antibacterial agent is preferably supported at 0.8 × 10 ⁻⁵ g / m ² or more from the viewpoint of obtaining sufficient antibacterial deodorization performance, and the amount of the surfactant used to ensure the charging performance of the filter medium From the viewpoint of restraining, it is preferably supported by 1.6 × 10 ⁻⁵ g / m ² or less. In this embodiment, for example, 1.28 × 10 ⁻⁵ g / m ^{2 is} supported.

  As the surfactant, a cationic surfactant, an anionic surfactant, an amphoteric surfactant, a nonionic surfactant, or a mixture thereof is used. Examples of the mixture include a mixture of a cationic surfactant and an anionic surfactant. Examples of the cationic surfactant contained in the mixture include special polymer quaternary ammonium salts such as alkyltrimethylammonium salts and dialkyldimethylammonium salts. Examples of the anionic surfactant contained in the mixture include an alkylene oxide adduct of a higher alcohol, an alkylene oxide adduct of an alkylamine of a higher alcohol, and an alkylene oxide adduct of a styrenated phenol. In this mixture, the cationic surfactant and the anionic surfactant are preferably contained in a mass ratio of 4: 6 to 6: 4.

The surfactant is supported on the filter medium 2 by 0.004 to 0.16 g / m ² . The surfactant is preferably supported in an amount of 0.004 g / m ² or more from the viewpoint of uniformly dispersing the antibacterial agent in the chemical solution for attaching the antibacterial agent to the filter medium, and avoids a decrease in charging performance of the filter medium. Therefore, it is preferable that 0.16 g / m ² or less is supported. In this embodiment, for example, 0.128 g / m ^{2 is} supported.

From the viewpoint of dispersibility of the antibacterial agent in the solution, the antibacterial agent and the surfactant are a stock solution of TioTio (registered trademark) described later (solid content: 0.004% by mass) and a stock solution of Nikkanon NS-30 (solid) described later. It is preferable that the chemical liquid mixed at a mass ratio of 1:20 to 1: 1 is attached to the filter medium 2 and dried so as to be supported on the filter medium 2.
The antibacterial agent and the surfactant may be uniformly supported on the entire filter medium 2 or may be supported only on a part (for example, the collection layer).

  The filter medium 2 may further carry a fungicide as long as the effects of the present invention are not impaired. Antifungal agents include biguanides, alcohols, phenols, anilides, iodines, imidazoles, thiazoles, isothiazolones, triazines, fluorines, carbohydrates, tropolones, organometallics, inorganics, etc. What contains a compound can be used. Especially, since use is recognized also as a food additive, what contains an imidazole type compound is preferable, and what contains thiabendazole is used more preferable among these.

It is desirable that the antibacterial deodorizing filter medium 1 has a bactericidal activity value measured in the quantitative test specified in JIS L1902 “Method for testing antibacterial properties of textile products” of 0 or more, and a bacteriostatic activity value measured in the same quantitative test. Is preferably 2.2 or more. When the bacteriostatic activity value is 2.2 or more, it is possible to satisfy the requirements for obtaining the SEK mark approved by the Fiber Evaluation Technology Council.
The antibacterial deodorant filter medium 1 can be manufactured, for example, by a method for manufacturing an antibacterial deodorant filter medium described later.

  The antibacterial deodorizing filter medium 1 includes the collection layer 3 made of the electret-treated nonwoven fabric, so that it has a charging performance in addition to the collection performance of the nonwoven fabric itself, and has an antibacterial agent, thereby providing an antibacterial performance. And also has deodorizing performance (that is, it has antibacterial deodorizing performance). In addition, when the amount of the antibacterial agent is increased, the amount of the surfactant for uniformly adhering it to the filter medium 2 is also increased and the charging performance is deteriorated. By making the amount lower than the predetermined upper limit value, the amount of the surfactant is also reduced, thereby avoiding a decrease in charging performance.

For the collection layer, a resin nonwoven fabric other than polypropylene may be used, or a nonwoven fabric other than a meltblown nonwoven fabric may be used. In addition, the collection layer may be made of a nonwoven fabric made of other materials such as natural fiber or glass fiber instead of the nonwoven fabric made of synthetic fiber. The reinforcing layer may be a non-polyester resin non-woven fabric or a non-spun non-woven fabric.
In other embodiments, the filter medium may not include a reinforcing layer. Moreover, the collection layer and the reinforcing layer may be a single layer or multiple layers.

(Production method of antibacterial and deodorant filter media)
Next, the manufacturing method of an antibacterial deodorizing filter medium is demonstrated.
In FIG. 2, the flowchart explaining the manufacturing method of the antibacterial deodorizing filter material by one Embodiment of this invention is shown. This method for producing an antibacterial deodorizing filter medium includes an electret treatment process (step S10), a lamination process (step S20), a chemical solution adhesion process (step S30), and a drying process (step S40).

In the electret treatment step S10, the nonwoven fabric is subjected to electret treatment to obtain a collection layer. The above-mentioned thing is used for a nonwoven fabric, for example.
The electret treatment is performed by applying a DC voltage to the nonwoven fabric. The value of the DC voltage to be applied is appropriately determined according to the shape of the electrode, the distance between the electrodes, and the like, taking into account the charged charge amount required for the electret nonwoven fabric, the speed of the electret treatment, and the like. For example, when the distance between electrodes is 8 mm, it is carried out by applying a DC voltage of 5 kV or more, preferably 6 to 20 kV, to the nonwoven fabric. The application of the DC voltage may be performed by any method and is not particularly limited. For example, a non-woven fabric may be passed between electrodes to which a DC voltage is applied, or by applying corona discharge or a pulsed high voltage to the surface of the non-woven fabric. Alternatively, a method of holding the front and back surfaces of the nonwoven fabric with other dielectrics and applying a DC high voltage to both surfaces, a method of applying a voltage while irradiating the nonwoven fabric with light, or the like may be used.

In the lamination step S20, the reinforcing layer is laminated on the collection layer after the electret treatment step.
The method for laminating the collection layer and the reinforcing layer is not particularly limited. For example, a melt-blown layer is formed on a non-woven sheet (reinforcing layer) produced by a method of bonding two layers using an adhesive or a method other than the melt-blowing method. Lamination of the collection layer by the method can be mentioned. The two types of non-woven fabrics can be bonded together by spraying a thermoplastic, low melting point hot melt resin powder, spraying a moisture-curing urethane resin by a spray method, thermoplastic resin, heat sealing. A method of spreading fibers and passing through a heat path can be mentioned. In particular, a method of spraying a thermoplastic and low-melting hot-melt resin powder is preferable for reducing the bonding area between the nonwoven fabrics and improving air permeability. As the hot melt resin, thermoplastic, low melting polyester, polyamide, urethane, polyolefin, and ethylene-vinyl acetate copolymer (EVA) resins can be used. Furthermore, as a method of bonding the melt blown nonwoven fabric and the spunbond nonwoven fabric, a heat embossing method may be used because the flexibility of the filter medium 2 is increased and the mechanical strength and durability are remarkably improved. As a result, even when the filter pack is formed long in one direction, the filter medium can be reduced in weight without using a hard reinforcing material, and even if the filter medium is thin, sufficient tensile strength against twisting can be imparted and handled. The damage at the time can be prevented.

  In other embodiments, the stacking step may be performed prior to the electret processing step. That is, after the reinforcing layer is laminated on the collection layer, the electret treatment may be performed on the laminated body.

In the chemical solution attaching step S30, a chemical solution containing an antibacterial agent and 0.1 to 2.0% by mass of a surfactant is attached to 10 to ²⁰ g / m ² to the filter medium including the collection layer.

The antibacterial agent is attached to the filter medium so that 0.8 × 10 ^{−5 to} 1.6 × 10 ⁻⁵ g / m ^{2 is} supported on the filter medium after the drying step S40. Therefore, the antibacterial agent is attached to the filter medium in the state of an aqueous solution (chemical solution). Such a chemical solution is prepared by, for example, mixing an antibacterial agent diluted solution obtained by further diluting an aqueous solution containing an antibacterial agent with pure water and an aqueous solution containing a surfactant, and adjusting the concentration of the surfactant. The The chemical solution contains a penetrating agent and a thickener as necessary. As the antibacterial agent, for example, the above metal composition is used. As the aqueous solution containing the antibacterial agent, for example, an aqueous solution having a concentration composition of iron 16 μg / ml, aluminum 23 μg / ml, titanium 0.08 μg / ml, and potassium 0.22 g / ml is used. Here, the concentrations of iron, aluminum, and titanium are values obtained by ICP emission spectroscopy, and the concentration of potassium is a value obtained by atomic absorption. As the aqueous solution containing the antibacterial agent having such a composition, a commercially available product such as TioTio (registered trademark) manufactured by Sunward Trading Co., Ltd. can be used. As an aqueous solution containing a surfactant, for example, an aqueous solution containing a mixture of the above-described cationic surfactant and anionic surfactant in a mass ratio of 1: 1, for example, manufactured by Nikka Chemical Co., Ltd. Nicanon NS-30 is used. After mixing the aqueous solution containing the antibacterial agent and the aqueous solution containing the surfactant, the chemical solution is diluted with pure water so that the concentration of the surfactant is 0.1 to 2.0% by mass. The concentration of the surfactant in the chemical solution is preferably 0.1% by mass or more from the viewpoint of uniformly attaching the antibacterial agent to the filter medium, and 2.0% by mass from the viewpoint of suppressing a decrease in charging performance of the filter medium. It is preferable that: As a result, the concentration of the antibacterial agent in the chemical solution is adjusted to 2.0% by mass, for example.

In addition, the preparation of the chemical solution when the chemical solution further contains a fungicide is, for example, adding an antibacterial agent, a surfactant and a fungicide to pure water whose viscosity has been adjusted in advance and stirring sufficiently. Done in
The method for attaching the chemical solution to the filter medium in the chemical solution attaching step is not particularly limited and is performed by a known method such as spray coating, transfer by roll coating, impregnation, etc., but the amount of moisture to be removed in the subsequent drying step is suppressed. It is preferably carried out by spray coating from the viewpoint that the charging performance can be prevented from being impaired by moisture heated by heat during drying. Spray coating can be performed by a known method. Adhesion of a chemical | medical agent is performed by controlling the adhesion amount of the chemical | medical solution with respect to a filter medium area. The adhesion amount of the chemical solution is 10 g / m ² or more, preferably 13 g / m ² or more from the viewpoint of supporting a sufficient amount of the antibacterial agent on the filter medium, and the amount of the surfactant adhering to the filter medium is minimized. For the reason, it is 20 g / m ² or less, preferably 19 g / m ² or less. In this embodiment, for example, 16 g / m ^{2 is} applied.

  When the filter medium is the above-mentioned two-layer filter medium of melt blown nonwoven fabric and spunbond nonwoven fabric, spray coating may be performed from either side, but from the viewpoint of allowing the chemical solution to adhere uniformly to the entire filter medium, the spunbond nonwoven fabric side It is preferable to spray from. In this case, the chemical solution passes through the spunbonded nonwoven fabric and reaches the meltblown nonwoven fabric.

  Drying process S40 evaporates the water | moisture content in a chemical | medical solution after chemical | medical solution adhesion process S30. Drying is performed, for example, in an oven heated to 130 to 180 degrees for 5 to 15 seconds. In another embodiment, the drying step may be performed by natural drying instead of heat drying.

After the drying step, the filter medium carries 0.8 × 10 ^{−5 to} 1.6 × 10 ⁻⁵ g / m ² of the antibacterial agent. After drying, the filter medium is wound into a roll, for example. The filter material wound up in a roll shape is subjected to pleating, and a gap retaining material is formed as necessary, or pasting is performed by spraying the above-described hot melt resin powder, and a filter pack is manufactured. The filter pack is housed in a frame to complete the antibacterial deodorizing filter described later.

According to the above method for producing an antibacterial deodorizing filter medium, the surfactant contained in the chemical solution is suppressed to a predetermined concentration range, and therefore the amount of the surfactant supported on the filter medium after drying is suppressed. Thereby, the fall of the charging performance of a filter medium is suppressed, and the collection performance by static electricity is maintained. Further, according to this manufacturing method, since the amount of the chemical solution attached to the filter medium is suppressed within a predetermined range, the charging performance of the filter medium is affected by the heated water in the drying step after the chemical solution attachment step. The degree is minimized.
In other embodiments, the chemical solution may be a solution containing a solvent other than water.

(Antimicrobial deodorant filter)
Next, the antibacterial deodorizing filter of the present invention will be described.
3 and 4 show the appearance of the antibacterial deodorizing filter 10 according to one embodiment of the present invention. FIG. 3 is a diagram showing an appearance of the antibacterial deodorizing filter according to the embodiment of the present invention. FIG. 4 is a view showing an attachment state in which the antibacterial deodorization filter of one embodiment of the present invention is attached to the attachment frame.

The antibacterial deodorizing filter 10 is used, for example, in a general air conditioning system.
The antibacterial deodorizing filter 10 is attached to a mounting frame 30 having an opening 31. The mounting frame 30 is embedded in a plurality of locations such as a wall and a ceiling in a building such as a building.
The antibacterial deodorizing filter 10 is a medium performance filter (mainly an air filter having a medium particle collection rate for particles having a particle size of less than 5 μm, and a light scattering light quantity integrating method (colorimetric method) of 50 to 95%. Collection efficiency or counting method (air filter with a particle size of 0.3 μm) and an air filter with a collection efficiency of 5 to 90% or HEPA (High Efficiency Particulate Air) filter (for particles with a particle size of 0.3 μm at the rated air volume) The filter has a trapping efficiency of 99.97% or more and an initial pressure loss of 245 Pa or less.
The antibacterial deodorizing filter 10 is a mini-pleat type air filter including a filter pack 11 and a frame body 21.

  The filter pack 11 is formed, for example, by pleating the above-described antibacterial deodorant filter medium 1 and holding a gap between two adjacent pleats formed on the antibacterial deodorant filter medium 1. The pleating process can be performed by a method such as a rotary method or a reciprocating method. The gap between the pleats may be retained by, for example, providing the gap retaining material 13 on the surface of the antibacterial deodorant filter material 1, and performing the pasting on the antibacterial deodorant filter material 1 by spraying the above-described hot melt resin powder. It may be broken. The gap retainer 13 is a resin hot melt ribbon that is formed on the surface of the antibacterial deodorizing filter medium 1 and serves as a spacer in order to stably maintain the distance between the apexes of two adjacent pleats. The hot melt ribbon is formed on both surfaces of the antibacterial deodorizing filter medium 1 so as to extend in a direction orthogonal to the fold line of the fold portion of the pleat, for example. A plurality of hot melt ribbons are provided in the fold direction of the pleats and extend in parallel to each other. In FIG. 3, the hot melt ribbon 13 is not shown except for those formed in the vicinity of both ends of the pleat in the crease direction. The hot-melt ribbon 13 is provided by applying polyolefin, hot-melt polyamide resin, polyester resin, or the like with a hot-melt applicator.

In another embodiment, the interval between the pleats may be held by a filter medium in which a large number of embosses are formed on the surface by the above-described heat embossing process, instead of such a gap holding material 13. In addition, when the antibacterial deodorant filter is a separator type air filter instead of a mini-pleat type, the antibacterial deodorant filter medium is folded back by a wave type separator inserted into the folded part of the filter medium folded back in a zigzag shape. The interval between the portions may be kept.
The filter pack 11 has both ends of the filter pack 11 in the fold direction of the pleat fixed to the frame body 21 with a resin such as polyurethane in order to improve the sealing performance. In addition, in this embodiment, both ends of the filter pack 11 in the direction in which the folds of the pleats are arranged are sealed by a force acting on the frame body 21 due to the pleat shape of the filter pack 11. Then, in order to further improve the sealing performance, a band-shaped adhesive made of a hot melt adhesive such as polyolefin may be attached.

The frame body 21 houses the filter pack 11 and is disposed in the opening 31 of the mounting frame 30. The frame body 21 is made by combining metal or plastic plate materials. As the metal plate material, a galvanized steel plate, stainless steel or the like is preferably used from the viewpoint of rust prevention. A flange 23 that can be locked to the opening 31 of the mounting frame 30 is formed on the outer periphery of the frame body 21. The flange 23 protrudes from the end on the airflow inflow side of the frame 21 to the outer peripheral side and is formed over the entire outer peripheral portion of the frame 21, and the outer peripheral end of the flange 23 is the inner peripheral side of the opening 31. It is located on the outer peripheral side from the end. The main body 24 extending from the flange 23 to the airflow outflow side is sized to pass through the opening 31. With such a configuration, the antibacterial deodorizing filter 10 can be attached to the attachment frame 30 by engaging the flange 23 with the opening 31 while passing the main body 24 through the opening 31.
Note that a floor material (not shown) made of urethane foam may be arranged on the bottom of the frame body 21 in order to more reliably suppress leakage. The flooring is a sheet-like member that extends in the plane direction so as to cover the bottom of the main body 24. In this case, the filter pack 11 is placed on the flooring.

The frame body 21 has a fixing mechanism 25 that fixes the stored filter pack 11. Here, the fixing mechanism 25 will be described in detail with reference to FIGS. FIG. 5 is an exploded view of the antibacterial deodorizing filter fixing mechanism 25 shown in FIG. FIG. 6 is a view showing the fixing mechanism 25 shown in FIG. 5 as viewed from the front. FIG. 7 is a diagram showing a locking state of the fixing mechanism 25 of the antibacterial deodorizing filter shown in FIG.
In the present embodiment, the fixing mechanism 25 includes eight locking protrusions 41 and four locking members 51.

  The locking projection 41 is a bar-like portion that protrudes and extends from the inner peripheral wall surface 21 a of the frame body 21. The inner peripheral wall surface 21 a is a wall surface facing both ends of the filter pack 11 in the direction in which the folds of the pleats are arranged when the filter pack 11 is stored in the frame body 21. Two locking protrusions 41 are provided in the horizontal direction in the vicinity of the other inner peripheral wall surface 21b adjacent to the inner peripheral wall surface 21a of the inner peripheral wall surface 21a. A total of four are provided on one inner peripheral wall surface 21a.

  One locking member 51 is provided for each of the two locking protrusions 41. The locking member 51 has two openings 53 that are inserted through the locking protrusions 41. The opening 53 of the locking member 51 has a bent shape that allows the locking projection 41 to be inserted and slide in the vertical direction (vertical direction in the attached state) and the horizontal direction. As shown in FIG. At the end of the portion 53 that extends in the horizontal direction, there is a locking position 53a where the locking projection 41 is locked. In FIG. 6, a broken-line arrow shown in the opening 53 indicates a direction in which the locking member 51 inserted through the opening 53 slides in the opening 53. In FIG. 6, an arrow A indicates a direction in which the locking member 51 moves with respect to the locking protrusion 41 before the locking protrusion 41 inserted through the opening 53 moves to the locking position 53 a. In FIG. 3, the opening 53 is not shown for convenience.

  The locking member 51 further has a contact surface 55 that presses the stored filter pack 11 in the ventilation direction. The ventilation direction is the vertical direction of the paper in FIGS. The locking member 51 can take a pressed state in which the filter pack 11 is pressed against the contact surface 55 when the locking projection 41 is in the locking position 53 a in the opening 53. The contact surface 55 is a lower surface of a plate-like portion extending in the horizontal direction in the attached state, and in the pressed state, a force is exerted from above to below on the top of the pleats of the filter pack 11 housed in the frame body 21. Let This prevents leakage between the filter pack 1 and the frame body 21 when the floor material is arranged in the frame body 21 while maintaining that the filter pack 11 can be replaced. It is possible to prevent the filter pack 1 from being detached from the frame body 21 even when receiving an air flow of an air volume. Note that the antibacterial deodorizing filter 10 can be used without replacing the frame body 21 because the filter pack 11 can be replaced. The filter pack 11 can be replaced, for example, by removing the antibacterial deodorizing filter 10 from the mounting frame 30 and removing the locking member 51 of the fixing mechanism 25 from the locking projection 41, then removing the filter pack 11 and storing a new filter pack. This can be done.

The antibacterial deodorant filter 10 is prepared by fixing the filter pack 11 to the frame body 21 by the fixing mechanism 25 after the filter pack 11 is housed in the frame body 21. The filter pack 11 is fixed using the fixing mechanism 25. First, the locking protrusion 41 is inserted through the opening 53 of the locking member 51 as shown by a broken line in FIG. This is performed by moving it in the direction of arrow A and sliding it to the locking position 53a.

  The antibacterial deodorizing filter 10 described above can be attached to the attachment frame 30 by the flange 23 of the frame body 21 being engaged with the opening 31 of the attachment frame 30. With such a configuration, a box-type air filter device can be installed on the ceiling, wall, room, etc. of buildings, houses, factories, and the like. Moreover, since the antibacterial deodorization filter 10 is equipped with the filter pack 11 produced using the antibacterial deodorization filter material 1, it has antibacterial deodorization performance, maintaining the collection performance by the electret nonwoven fabric.

  Since the antibacterial deodorizing filter 10 can be replaced with a new filter pack when the filter pack 11 is clogged, the fixing mechanism 25 can prevent the filter pack 11 from coming off the frame body 21 during use. It is possible to prevent the filter pack 11 from being detached from the frame body 21 during use while maintaining that the filter pack 11 can be replaced. In an air filter in which a high air volume always passes, for example, reinforcing means such as expanded metal is provided on the frame so that the filter pack does not come off the frame, but the high air volume does not always pass. The antibacterial deodorizing filter 1 is not provided with a reinforcing means in order not to disturb the air flow, but the filter pack 11 is fixed by the fixing mechanism 25 even when a high air volume passes unintentionally. The filter pack 11 is prevented from being detached from the frame body 21.

  Further, the locking member 51 of the fixing mechanism 25 can exert a pressing force against the filter pack 11 by the abutment surface 55. When a flooring is arranged in the frame body 21, a rod-shaped pack presser 71. Compared with the case where the filter pack 11 is fixed to the frame body 21 through the flooring (see FIG. 9C), the backlash between the filter pack 11 and the frame body 21 is more reliably suppressed, and the leak is reduced. Can be reduced.

  In another embodiment, the locking member of the fixing mechanism extends in correspondence with the length of the entire width of the inner peripheral wall surface of the frame body, as shown in FIG. It may be formed so that it can be stopped. FIG. 8 is an external view showing a locking member of a fixing mechanism of an antibacterial deodorizing filter according to another embodiment of the present invention. In addition, in another embodiment, three or more locking protrusions may be provided instead of being provided side by side at one end of the inner peripheral wall surface of the frame. In this case, the opening of the locking member is provided according to the number and position of the locking protrusions. In the opening of the locking member, the two linear portions may be bent by 90 °, for example, may be bent smaller or larger than 90 °.

In another embodiment, the antibacterial deodorization filter may be another type of air filter such as a separator type or a V bank type instead of the mini-pleat type.
In other embodiments, the antibacterial deodorizing filter may not include a fixing mechanism.

Next, a modification of the frame fixing mechanism will be described with reference to FIG.
FIG. 9A is an external view showing a filter pack of an antibacterial deodorizing filter according to another embodiment of the present invention. (B) is an external view which shows the frame in which the filter pack shown to (a) is accommodated. (C) is an external view which shows the antibacterial deodorizing filter which accommodated the filter pack shown to (a) in the frame shown to (b), and was further fixed by the fixing mechanism.
In this antibacterial deodorizing filter 10, a rod-like member 71 may be used as a fixing mechanism instead of the above-described locking projection 41 and locking member 51. In this antibacterial deodorizing filter 10, after the filter pack 11 is housed in the frame body 21, both ends of the two rod-like members 71 are provided in holes (not shown) provided in corresponding portions of the inner peripheral wall surface of the frame body 21. By inserting, the filter pack 11 can be fixed to the frame body 21.

Next, an Example is shown and this invention is demonstrated concretely.
Example 1
An electret treatment was performed on a polypropylene melt-blown nonwoven fabric having a thickness of 0.1 mm and a basis weight of 23 g / m ² . The electret treatment was performed by applying a DC voltage of 6 to 20 kV to the melt blown nonwoven fabric with the distance between the electrodes being 8 mm. Next, hot melt powder made of polyester resin is sprayed between the meltblown nonwoven fabric subjected to electret treatment and the polyester spunbond nonwoven fabric having a thickness of 0.53 mm and a basis weight of 110 g / m ² and heated at 160 degrees. Thus, a filter medium having a thickness of 0.63 mm, a basis weight of 133 g / m ² , a length of 603 mm and a width of 116 mm was obtained. The obtained filter medium had a tensile strength in the MD direction of 200 N / 50 mm in accordance with TAPPI (The Technical Association of the Pulp and Paper Industry) standard: T-494.
Subsequently, an aqueous solution containing an antibacterial agent (manufactured by Sunward Trading Co., TioTio (registered trademark), solid content 0.004% by mass, iron 16 μg / ml, aluminum 23 μg / ml, titanium 0.08 μg / ml, potassium 0.22 μg / ml) further diluted 8 times with pure water and an aqueous solution containing a surfactant (Nikkanon NS-30, manufactured by Nikka Chemical Co., Ltd.), and TioTio (registered trademark) and Nikkanon NS-30 are mixed. A chemical solution containing a mass ratio of 1: 1 was obtained. Here, 100 g of a chemical solution containing 2 g of TioTio (registered trademark) and 2 g of Nikkanon NS-30 was prepared, 2.0% by mass of antibacterial agent (solid content 0.004% by mass), and 2.0% by mass of surfactant. (Solid content 40% by mass)) was obtained. The obtained chemical solution was spray-coated at a coating amount of 16 g / m ^{2 on} the filter medium using a spray. After applying the chemical solution, the filter medium was dried in an oven heated to 140 ° C. for 12 seconds to obtain an antibacterial and deodorant filter medium.
The obtained antibacterial deodorizing filter medium was pleated with a rotary weaving machine, and a hot melt ribbon made of polyolefin was formed on the surface to obtain a filter pack. And the frame body was created combining the board | plate material which has the flange made from a hot dip galvanized steel plate, the obtained filter pack was accommodated, and the filter pack was fixed to the frame using the fixing mechanism 25 of the said embodiment.

(Conventional example)
An antibacterial deodorizing filter was prepared in the same manner as in Example 1 except that the electret treatment was not performed on the meltblown nonwoven fabric.

(Examples 2 to 4, Comparative Examples 1 to 3, Conventional Example)
An antibacterial deodorizing filter was prepared in the same manner as in Example 1 except that the chemical solutions were adhered in the amounts and manners shown in Table 1, respectively. In Table 1, “spraying” means that the chemical solution is attached by spraying, and is the same as in Example 1. “Impregnation” means that the chemical solution is attached by impregnation.
The antibacterial agent carrying amount, the surfactant carrying amount, the collection efficiency, the pressure loss, the antibacterial property and the deodorizing property of the antibacterial deodorizing filters of Examples 1 to 4 and Conventional Examples and Comparative Examples 1 to 3 are measured as follows evaluated. The results are shown in Table 1 below.

(Amount of antibacterial agent)
A 100 mm square sample of antibacterial deodorizing filter medium is completely wet-decomposed with sulfuric acid or nitric acid, diluted with water, potassium is subjected to quantitative analysis by atomic absorption spectrometry, and iron, aluminum, and titanium are quantitatively determined by ICP emission spectroscopy. The analysis was performed, and the antibacterial agent adhesion amount (g / m ² ) was converted by the value (μg / ml).
(Surfactant loading)
A 100 mm square sample of antibacterial deodorizing filter medium is extracted with alcohol, the sample is adjusted with water, and a cationic surfactant, such as a quaternary ammonium compound, is obtained by solid phase extraction-HPLC (High Performance Liquid Chromatography (high performance liquid chromatography) is used for quantitative analysis. Anionic surfactants and nonionic surfactants are quantitatively analyzed by solid-phase extraction and spectrophotometry, and the antibacterial agent adheres based on the value (mg / l). The amount (g / m ² ) was converted.

(Weight)
A test piece of 100 × 100 mm was taken from the sample, the weight was measured, and it was calculated per 1 m ² .
(Thickness)
A 100 × 100 mm test piece was taken from the sample and measured with a dial thickness gauge.
(Collection efficiency)
Air of 0.3 μm air particles is passed at a filtration rate of 5.3 cm / second, and the dust concentration before and after passing is measured continuously and continuously by the light scattering light quantity integration method according to JIS Z8813. Thus, the collection efficiency was obtained.
Collection efficiency (%) = (Dust concentration after passing (number / L) −Dust concentration before passing (number / L)) / (Dust concentration before passing (number / L)) × 100
As a result, a sample having a collection efficiency of 80% or more was evaluated as A, a sample having a collection efficiency of 70% or more and less than 80% was evaluated as B, and a sample having a collection efficiency of less than 70% was evaluated as C.

(Pressure loss)
In parallel with the collection efficiency test, the static pressure difference between the upstream and downstream of the filter medium was measured when an air flow with a wind speed of 5.3 cm / second was passed through, and this was taken as the pressure loss. As a result, a pressure loss of less than 18 Pa was evaluated as A, a pressure loss of 18 Pa or more and less than 25 Pa was evaluated as B, and a pressure loss of 25 Pa or more was evaluated as C.

(Antimicrobial and deodorant)
After washing 10 times according to JIS L0217 method, in accordance with JIS L1902 (antibacterial test method and antibacterial effect of textile products) quantitative test method (bacterial solution absorption method), bactericidal activity value and bacteriostatic The activity value was measured and antibacterial and deodorizing properties were evaluated. Each measurement was performed n (= 3) times, and the average of the numerical values at each time was used. As a test bacterium, Staphylococcus aureus (ATCC 6538P) was used. The method for measuring the viable cell count was based on the pour plate culture method.
The antibacterial property is determined using the bactericidal activity value according to the following formula (1), and when the bactericidal activity value is 2.8 or more, A, when 1.0 or more and less than 2.8, B, 1. The case of less than 0 was evaluated as C, the case of exceeding 1.0 was evaluated as antibacterial, and the case of less than 1.0 was evaluated as having no antibacterial property. The deodorizing property is determined using the bacteriostatic activity value according to the following formula (2). Moreover, when it exceeded 2.5, it was deodorant, and when it was 2.5 or less, it was evaluated that there was no deodorant.
Bactericidal activity value = log a-log c (1)
Bacteriostatic activity value = (log b-log a)-(log c-log 0) (2)
a: Average number of inoculated bacteria (number of bacteria recovered immediately after inoculation of unprocessed cloth (filter material not carrying antibacterial agent)) b: Average value of the number of bacteria recovered after 18 hours of incubation of unprocessed cloth c: Processed cloth Average value of the number of bacteria collected after 18 hours of culturing (filter medium carrying an antibacterial agent) The test establishment condition was that the growth value calculated by log b-log a was 1.0 or more.

As is clear from Table 1, the antibacterial and deodorant filter medium that does not carry a surfactant (Comparative Example 1) was insufficient in both antibacterial and deodorant properties.
On the other hand, according to the antibacterial deodorizing filter medium carrying a predetermined amount of the antibacterial agent together with the surfactant (Examples 1 to 4), the antibacterial and deodorizing properties were excellent. Moreover, these antibacterial deodorizing filter media maintained the collection efficiency despite carrying the surfactant.
In addition, when the antibacterial agent carried by the antibacterial and deodorant filter medium is 1.28 × 10 ⁻⁵ g / m ² (Examples 1 and 2), it is smaller than that (Example 3 and Comparative Example 2) Excellent antibacterial and deodorant properties. In addition, when the surfactant carried by the antibacterial deodorizing filter medium is 0.128 g / m ² (Examples 1, 3 and 4), the collection efficiency is more excellent than when it is not (Comparative Example 3). It was.

  As described above, the antibacterial deodorizing filter material, the method for producing the antibacterial deodorizing filter material, and the antibacterial deodorizing filter of the present invention have been described in detail. Of course, you may make changes.

DESCRIPTION OF SYMBOLS 1 Antibacterial deodorant filter material 2 Filter medium 3 Collection layer 5 Reinforcement layer 10 Antibacterial deodorant filter 11 Filter pack 13 Gap holding material 21 Frame body 23 Frame flange 25 Fixing mechanism 30 Mounting frame 31 Mounting frame opening 41 Locking protrusion 51 Engagement Stop member 53 Locking member opening 53a Locking position S10 Electret processing step S20 Chemical solution attaching step S30 Solvent removing step

Claims (8)

A filter medium including a collection layer made of a nonwoven fabric subjected to electret treatment;
An antibacterial deodorizing filter medium comprising an antibacterial agent 0.8 × 10 ^{−5 to} 1.6 × 10 ⁻⁵ g / m ² and a surfactant carried on the filter medium.   The antibacterial deodorizing filter medium according to claim 1, wherein the non-woven fabric is a melt blown non-woven fabric, and the filter medium further includes a reinforcing layer laminated on the collection layer and made of a spunbonded non-woven fabric.   The antibacterial agent contains, by mass ratio, iron 0.0001 to 0.02, aluminum 0.0002 to 0.02, titanium 0.0000008 to 0.000004, and potassium 0.000002 to 0.002. The antibacterial deodorizing filter medium according to claim 1 or 2, wherein An electret treatment step of obtaining a trapping layer by applying an electret treatment to the nonwoven fabric;
Chemical solution adhesion containing an antibacterial agent and a surfactant, and a chemical solution having a concentration of the surfactant of 0.1 to 2.0% by mass is attached to the filter medium including the collection layer by 10 to ²⁰ g / m ^2. Process,
A solvent removing step of removing the solvent of the chemical solution after the chemical solution attaching step,
After the solvent removal step, the filter medium carries the antibacterial agent at 0.8 × 10 ^{−5 to} 1.6 × 10 ⁻⁵ g / m ² .
A method for producing an antibacterial deodorizing filter medium. An antibacterial deodorizing filter attached to a mounting frame having an opening,
A filter pack formed by pleating the antibacterial deodorant filter material according to any one of claims 1 to 3, and holding a gap between two adjacent pleats formed on the antibacterial deodorant filter material,
Storing the filter pack, and a frame disposed in the opening of the attachment frame,
A flange that can be locked to the opening of the mounting frame is formed on the outer periphery of the frame.
Antibacterial deodorant filter. An antibacterial deodorizing filter attached to a mounting frame having an opening,
A filter pack formed by pleating the antibacterial deodorant filter material produced by the method for producing an antibacterial deodorant filter material according to claim 4, and holding a gap between two adjacent pleats formed on the antibacterial deodorant filter material;
Storing the filter pack, and a frame disposed in the opening of the attachment frame,
A flange that can be locked to the opening of the mounting frame is formed on the outer periphery of the frame.
Antibacterial deodorant filter. The frame has a fixing mechanism for fixing the stored filter pack,
The fixing mechanism includes a locking protrusion that protrudes and extends from an inner peripheral side end of the frame body, and a locking member having an opening inserted through the locking protrusion,
The opening of the locking member has a shape that allows the locking member to slide in a state in which the locking protrusion is inserted, and has a locking position where the locking protrusion is locked.
The locking member further has a contact surface that presses the stored filter pack in the ventilation direction, and the filter projection is positioned at the locking position so that the filter pack is brought into contact with the contact surface. The antibacterial deodorizing filter according to claim 5, which can take a pressed state. The frame has a fixing mechanism for fixing the stored filter pack,
The fixing mechanism includes a locking protrusion that protrudes and extends from an inner peripheral side end of the frame body, and a locking member having an opening inserted through the locking protrusion,
The opening of the locking member has a shape that allows the locking member to slide in a state in which the locking protrusion is inserted, and has a locking position where the locking protrusion is locked.
The locking member further has a contact surface that presses the stored filter pack in the ventilation direction, and the filter projection is positioned at the locking position so that the filter pack is brought into contact with the contact surface. The antibacterial deodorizing filter according to claim 6, which can take a pressed state.

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