JP2009178670A - Filter medium of air filter and air filter for air cleaning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter medium for an air filter which is capable of efficiently removing adhering malodor by washing and dried in a shortened time after being washed and an air filter for an air cleaning device using the filter medium. <P>SOLUTION: The filter medium of the air filter is obtained by sticking a porous body with an average particle diameter of 40 μm or smaller and 2 to 5% by weight of a chemical deodorant to a fiber sheet containing hydrophobic fibers and hydrophilic fibers. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air filter medium that can be suitably used for an air cleaner, for example, and a cleaning / regenerating air filter for an air cleaner using the same. Specifically, the air filter does not emit odors that cause the user to feel uncomfortable even after repeated use because there is little reoccurrence of odor, short drying time after washing, and little change in deodorization performance. The present invention relates to a filter medium for cleaning and a cleaning / regenerating air filter for an air purifier using the same.

  In recent years, the performance required for air filters for air purifiers includes basic performance such as conventional low pressure loss and high dust collection, deodorization performance that prevents the generation of unpleasant odors such as tobacco odor, regeneration performance by washing, and repeated use. Sex is required.

  As an air filter having deodorizing performance, a filter in which a sheet-like electret filter and a sheet containing an adsorbent having an average particle diameter of about 20 μm are laminated and integrally formed into a pleat shape has been proposed (for example, Patent Document 1).

  However, this filter cannot be said to have sufficient deodorizing performance against complex odors such as tobacco smoke. Also, depending on the configuration of the sheet, the drying property after washing or the removal of odor tends to be insufficient, which is not preferable.

  In addition, the adsorbent sheet consisting of a deodorizing layer that is bonded and fixed to activated carbon having an average particle size of 60 μm on a supporting fiber including rayon fibers and polyester fibers, and a dust collecting layer made of electret fibers is air cleaned. It is proposed to be used as a filter for use (see, for example, Patent Document 2).

  However, in this filter, the amount of water retained by the granular activated carbon during washing increases, and the possibility of having a considerable time for drying increases. For this reason, there is a problem in actual use.

  In addition, as an air filter with little performance change due to cleaning, a filter using a filter medium having a two-layer structure of a polyester and polyethylene composite nonwoven fabric and a polytetrafluoroethylene microporous membrane has been proposed (for example, see Patent Document 3).

However, this filter has insufficient deodorizing performance against odor components such as tobacco odor and odor removal by washing. For this reason, when it is used for a long time as an air filter, there exists a problem that the odor component adhering to a filter medium becomes easy to be discharge | released again.
JP-A-4-74505 JP 2000-1117024 A JP 2006-61830 A

  Therefore, in the present invention, an air filter medium that solves the above-described problems, can effectively remove the attached odor by washing, and can shorten the drying time after washing, and an air purifier using the same. An object is to provide an air filter.

  In order to solve the above-mentioned problems, the present inventors have conducted intensive research, and as a result, by attaching a porous body and a chemical deodorizing agent to a fiber sheet using both hydrophobic and hydrophilic fibers, such problems have been solved. It has been sought to solve all at once. That is, the present invention is as follows.

  That is, the air filter medium of the present invention is obtained by attaching a porous material having an average particle size of 40 μm or less and a chemical deodorizer of 2 to 5% by mass to a fiber sheet containing hydrophobic fibers and hydrophilic fibers. It is.

  The porous body is hydrophobic and preferably contains at least either activated carbon or hydrophobic zeolite.

  The fiber sheet preferably contains 10 to 80% by mass of hydrophobic fibers.

  In the air filter medium, the chemical deodorizer contains at least one of a hydrazide compound and an alkali metal compound. In a test method based on the JEMA 1467 deodorization performance test method, the initial deodorization rate of the filter medium is preferably 40% or more.

  In the highly dust-collecting air filter medium of the present invention, an electret nonwoven fabric composed of hydrophobic fibers is integrally laminated on the air filter medium.

  The cleaning regeneration type air filter for an air cleaner of the present invention. Consists of the air filter medium.

  The air filter medium of the present invention uses a fiber sheet containing hydrophobic fibers and hydrophilic fibers. Drying is facilitated by using a fiber sheet containing hydrophobic fibers. On the other hand, since the fiber sheet contains hydrophilic fibers, it is easy to remove periodic components attached to the fibers.

  The air filter medium of the present invention uses a porous body having an average particle size of 40 μm or less and small particles. Thereby, the drying time after washing | cleaning can be shortened.

  Furthermore, the air filter medium of the present invention uses a chemical deodorant. A chemical deodorant is less likely to cause the regeneration of adsorbed components. Therefore, it is possible to obtain an air filter medium with little reoccurrence of attached odor.

Hereinafter, embodiments of the present invention will be described in detail.
The air filter medium of the present invention is obtained by attaching a porous body having an average particle size of 40 μm or less and a chemical deodorizer of 2 to 5% by mass to a fiber sheet containing hydrophobic fibers and hydrophilic fibers. .

(Fiber sheet)
The fiber sheet used in the present invention includes hydrophobic fibers and hydrophilic fibers. By including the hydrophobic fiber and the hydrophilic fiber, the advantages of both the hydrophobic fiber and the hydrophilic fiber can be utilized. That is, when a fiber sheet is composed of a single hydrophobic fiber, it dries quickly because moisture does not penetrate inside the fiber in the washing step, but the removability of odor components adhering to the fiber is remarkably inferior. On the contrary, when the fiber sheet is composed of a single hydrophilic fiber, the fiber sheet contains a large amount of water by washing, and therefore, the drying time is remarkably increased. When both hydrophobic and hydrophilic fibers are used, the hydrophilic fiber retains moderate moisture during washing, and the moisture comes into contact with the hydrophobic fiber, so water soluble on both hydrophobic and hydrophilic fibers The effect of removing the odor component is obtained. Moreover, at the time of drying, a hydrophobic fiber discharge | releases the water | moisture content contained in a hydrophilic fiber early.

  Examples of the hydrophobic fibers used in the present invention include polyester fibers, nylon fibers, ultrahigh molecular weight polyethylene fibers, polypropylene fibers, hydrophobic organic fibers such as polyaramid fibers, hydrophobic inorganic fibers such as silicon carbide fibers, and carbon fibers. Examples include fibers having hydrophobicity. Of these, polyester fibers are preferred in terms of versatility.

    What is necessary is just to mix 10-80 mass% of hydrophobic fiber with the fiber sheet used by this invention with respect to the whole fiber sheet. By mixing hydrophobic fibers within this range, the moisture content of the fiber sheet by washing becomes appropriate, and the drying time is greatly shortened. Moreover, the removal effect of the adhesion odor by the water | moisture content which the hydrophilic fiber hold | maintains is acquired.

  Examples of hydrophilic fibers used in the present invention include hydrophilic fibers such as natural fibers such as cotton, rayon fibers, polyvinyl alcohol fibers, and vinylon fibers. Of these, vinylon fibers are preferred because they have the smallest dimensional change in the washing and drying steps.

  As the fiber sheet used in the present invention, a fabric-like structure having a sufficient thickness with respect to an area constituted by fibers such as woven fabric, knitted fabric, and non-woven fabric can be used. Above all, because the short fiber nonwoven fabric is easy to mix a plurality of fibers in the manufacturing process such as wet papermaking and chemical bonding, and a sheet with excellent air permeability, which is a basic required characteristic of air filter media, can be obtained. preferable. Moreover, when manufacturing the above-mentioned short fiber nonwoven fabric, a resin binder is attached to a fiber group configured in a nonwoven fabric shape by carding or papermaking process, dried and solidified, and the fibers by the washing process are bonded between the fibers. It is more preferable because it can provide an effect of preventing the falling off. Any resin binder can be used as long as it has an effect of adhering fibers, and examples thereof include acrylic resin, polyester resin, and urethane resin.

(Porous body)
The porous body used in the present invention has a performance of removing by contacting and reacting with gas components such as physical adsorption, chemical adsorption, and ion exchange. Among them, a porous body having hydrophobicity is preferable because the drying time after washing can be shortened. Examples of the porous body having hydrophobicity include activated carbon, porous silica, and hydrophobic zeolite. In the present invention, it is preferable to include either activated carbon or hydrophobic zeolite as the hydrophobic porous body. Activated carbon has excellent properties for adsorption of various gas components. Hydrophobic zeolite is particularly excellent in ammonia adsorption. These can be used repeatedly by washing. For this reason, the air filter medium containing either activated carbon or hydrophobic zeolite is very suitable for use in places where odor problems such as tobacco odor and toilet odor are likely to occur.

  As the activated carbon used in the present invention, those using coconut shell, coal, wood flour, phenol resin and the like as raw materials are preferable. In particular, powdered activated carbon having a relatively fine particle size that is commercialized through processes such as firing, washing, pulverization, and ball splitting is preferable.

  The porous body is used to increase the reaction area with the odor component. Moreover, since the chemical deodorizing agent mentioned later enters into the micropores, it is preferable because the elution of the chemicals by washing can be prevented. In this case, the average diameter of the micropores is preferably 1 to 2 nanometers because the above-described effect is the largest.

  The porous body used in the present invention can be easily attached to the fiber by using a particulate material, and the required performance can be obtained by adjusting the amount of attachment. And it is necessary to use the thing whose average particle diameter calculated | required by a median diameter is 40 micrometers or less. When a deodorizing agent having a relatively large particle size is used among the fine particles having an average particle diameter exceeding 40 μm, the drying time after washing becomes remarkably long. As a cause, it is considered that the amount of moisture retained between the deodorant particles is larger than that having a small particle size. The average particle size is preferably 40 μm because it is excellent in drying properties after washing as described above, and is preferably 4 to 40 μm because it is easy to handle in the step of attaching to fibers.

  The porous body used in the present invention is attached in an adhesive state on the fibers constituting the fiber sheet. Adhesion is based on a method in which the fiber and the porous body are bonded via a binder resin such as acrylic, or a method in which the fiber is heated to a temperature equal to or higher than the melting point and the porous body is sprayed and bonded to the molten fiber. Can be arbitrarily selected.

The amount of the porous body attached to the fibers is preferably 10 to 50 g / m ² because the effect of the porous body can be obtained and the attachment onto the fibers is easy.

(Chemical deodorant)
The chemical deodorant used in the present invention refers to a substance that has the ability to be chemically bonded to a specific substance in the component of the adsorption target substance to change into another component and detoxify. The chemical deodorant has a feature that the adsorbed component is less likely to regenerate as compared with the physical adsorption by the porous body, and is known to be effective as a deodorizing prescription.

  Examples of the chemical deodorant used in the present invention include phosphoric acid and hydrochloric acid that generate an oxidation reaction to deodorize an alkaline gas, and potassium hydroxide and potassium carbonate that generate an alkaline reaction and deodorize an acid gas. Hydrazide compounds such as adipic acid dihydrazide, dodecanedioic acid dihydrazide, and succinic acid dihydrazide in primary to tertiary amine compounds that generate a reaction with sodium hydrogen carbonate, aldehydes, p-aminobenzenesulfonic acid, Examples include ethylene urea condensate drugs.

  The chemical deodorizer used in the present invention preferably contains at least one of a hydrazide compound and an alkali metal compound. Since the hydrazide compound is excellent in reactivity with acetaldehyde contained in a large amount in tobacco smoke, an effect of remarkably relieving an irritating odor peculiar to tobacco can be obtained. The hydrazide compound can be arbitrarily selected from the aforementioned adipic acid dihydrazide, dodecanedioic acid dihydrazide, succinic acid dihydrazide, and the like. Of these, adipic acid dihydrazide is more preferable because it exhibits an appropriate solubility, allows easy attachment of the deodorizer to the micropores, and does not easily fall off even after washing.

  Alkali metal compounds are more preferable because they are highly reactive with acid-based gases such as acetic acid, relieve acid-based “sour odors”, and change to odors that are difficult for the user to detect. The alkali metal compound can be arbitrarily selected from potassium hydroxide, potassium carbonate, sodium hydrogen carbonate and the like as described above. Of these, sodium hydrogen carbonate is more preferable because it is weakly alkaline and is highly safe in terms of handling.

  The chemical deodorant used in the present invention is attached in an adhesive state on the fibers constituting the fiber sheet or on the porous body. For the attachment, the porous body and the chemical deodorant are dispersed or dissolved in the same bath, and after adding the chemical deodorant to the surface of the porous body, the porous body is attached to the fiber, or the porous body Similarly, there are a method of adhering via a binder and a method of adhering fibers in a fused state.

  The chemical deodorant used in the present invention must have an amount of 2 to 5% by mass based on the filter medium. If the amount of chemical deodorant attached is less than 2%, chemical adsorption by the chemical deodorant does not work sufficiently, which is not preferable. On the other hand, if the amount of addition exceeds 5%, the initial chemical adsorption shows high performance, but the rate of elution or dropping by washing is large, and the chemical adsorption performance after washing is greatly reduced. When the relative change in performance is large, the feeling of use becomes extremely bad for the user, and therefore it is not preferable when cleaning is required.

  The air filter medium of the present invention having the above configuration preferably has a performance of 40% or more of the initial average deodorization efficiency in a test method based on the JEMA1467 deodorization performance test method. This is because the use of the air filter medium of the present invention reduces the deodorizing effect and the reoccurrence of the attached odor.

(Other components)
In addition to the above configuration, the air filter medium of the present invention may be one in which electret nonwoven fabrics composed of hydrophobic fibers are integrally laminated. By setting it as such a structure, the air filter medium which is excellent in the collection efficiency of a fine dust and has a short drying time after washing | cleaning can be obtained.

  Hydrophobic fibers here are hydrophobic fibers such as polyester fibers, nylon fibers, ultra high molecular weight polyethylene fibers, polypropylene fibers and polyaramid fibers, hydrophobic inorganic fibers such as silicon carbide fibers, and carbon fibers. It can be arbitrarily selected from fibers having Among them, polypropylene fiber is more preferable because the effect of electret is the greatest. The electret processing here is preferably arbitrarily selected from known methods such as a corona discharge method and a pure water contact method. In particular, it is more preferable to use a pure water contact method because a fiber sheet having high electrostatic force and low pressure loss can be obtained. Moreover, the nonwoven fabric here can be arbitrarily selected from known forms such as a single fiber nonwoven fabric and a long fiber nonwoven fabric. In particular, a nonwoven fabric obtained by the melt blow method is more preferable because it is a very thin nonwoven fabric with a thin fiber diameter.

  The air filter medium of the present invention can be used as an air filter, for example, by subjecting it to pleating or corrugating or storing it in a frame. The obtained air filter has the same effect as the air filter medium described above. Therefore, such a filter medium is preferably used in various air purifiers. In addition, the air cleaner in this invention is mainly used for the objective of purifying indoor air, such as a common house and a hotel.

  Hereinafter, the present invention will be described in detail based on examples, but the present invention is not necessarily limited thereto.

[Measuring method]
Measurement of chemical deodorant attachment rate (%), initial deodorization performance (%), deodorization performance after washing with water (%), drying time (hr), tobacco odor intensity (after use, after washing, after reuse) in this example Uses the method described below. As long as the measurement apparatus can obtain results equivalent to those of the following measurement method, other apparatuses may be used.

(1) Chemical deodorant deposition rate [%]
When an evaluation filter medium or filter having a frontage size of 259 mm × 493 mm is dried in a dry piece of 65 ° C. × 40% RH and then measured with a pH meter “Eco Scan pH 5” (manufactured by Techjam). The sample was impregnated in 15 L of tap water having a pH of 5.8 for 120 hours, taken out, stored in a drying cabinet at 50 ° C. × 60% RH for 24 hours, dried, and then weighed. It calculated from ratio with a base-material weight. Weight ratio before and after treatment = value obtained as the adsorbing ratio of the chemical adsorbent.

(2) Initial deodorization performance [%]
In a method in which a filter medium for evaluation having a frontage dimension of 259 mm × 493 mm or a filter alone is set in a home air cleaner “MA-516SV” manufactured by Mitsubishi Electric Home Equipment Co., Ltd. The average removal rate after 30 minutes of rapid operation (air volume 5.1 m3 / min) with respect to the combustion smoke of five cigarettes (“mild seven”) was measured.

(3) Deodorization performance after washing [%], drying time [hr]
The filter medium or filter used for the above-mentioned (2) initial deodorization performance measurement is impregnated for 6 hours in 15 L of tap water having a pH of 5.8 as measured with the same pH meter as that used for the above-mentioned drug adhesion rate measurement. Then, after taking out, it was stored in a sealed space of 25 ° C. × 60% RH, and the time until the weight became ± 1% from the weight before water impregnation was defined as the drying time. The filter medium or filter after drying was again measured for deodorization performance by the same method as in (2) Initial Deodorization Performance Measurement.

(4) Tobacco odor intensity (after use, after washing, after reuse)
A home air purifier “MA-516SV” manufactured by Mitsubishi Electric Home Equipment Co., Ltd., which has a filter area for evaluation or a single filter set in a room with a land area of 12 m ² and a height of 3.5 m, where outside air does not enter and exit, is in operation. The odor intensity of the air blown from the air purifier when operated under the condition “silent” was determined by 6 monitors using the 6-step odor determination method shown in Table 1 and indicated by the arithmetic average of the determination results of each person. .

  The odor intensity is determined by (a) (2) 24 hours after the initial deodorizing performance measurement, (b) (3) water washing-drying in the deodorizing performance measurement after washing, and (c) ( 3) Performed after 24 hours from measurement of deodorization performance after washing with water.

[Example 1]
(Fiber sheet)
85% by mass of polyester fiber with a fiber length of 24 mm (10% by mass with a fineness of 1.3 dtex, 30% by mass with a fineness of 3 dtex, 45% by mass with a fineness of 6 dtex), a vinylon fiber with a fineness of 17 dtex and a fiber length of 12 mm A fiber group composed of 5% by mass and 5% by mass of pulp is processed into a non-woven fabric by a wet papermaking method, and a styrene / acrylic resin binder having a glass transition point of 40 ° C. is attached to 25% by mass of the entire fiber with a basis weight of 42 g / m ² . A fiber sheet was used.

(Porous body)
Porous silica “Silysia 550N” (manufactured by Fuji Silysia Chemical Co., Ltd.) having an average particle diameter of 40 μm was used.

(Chemical deodorant)
Phosphoric acid with a purity of 96% was used.

(Filter material)
In water in which 0.02% by mass of the above-mentioned chemical deodorant is added, 6% by mass of the above porous material and 1.5% by mass of styrene / acrylic resin having a glass transition point of −4 ° C. are dispersed in water. impregnating the fiber sheet mentioned above, deodorants adhesion amount 20 g / ^{m 2,} the drug impregnated amount 1.5 g / ^{m 2,} it was used filter media of the total basis weight of 70.5 g / ^{m 2.}

  This filter medium had an initial deodorization performance of 35.7%, a deodorization performance after washing with water of 33.3%, and a drying time of 24 hours. Moreover, the average value of the tobacco odor intensity after use was 2.9, the average value of the tobacco odor intensity after washing was 1.6, and the average value of tobacco odor intensity after reuse was 2.9. .

[Example 2]
(Fiber sheet)
The same fiber sheet as in Example 1 was used.

(Porous body)
The same deodorizing agent as in Example 1 was used.

(Chemical deodorant)
The same drug as in Example 1 was used.

(Filter material)
Except for changing the addition amount of the above-mentioned chemical deodorant to 0.05% by mass, in the same manner as in Example 1, the deodorant adhesion amount 20 g / m ² , the chemical adhering amount 3.6 g / m ² , the total weight A filter medium of 73 g / m ² was used.

  This filter medium had an initial deodorization performance of 38.1%, a deodorization performance after washing with water of 33.5%, and a drying time of 20 hours. Moreover, the judgment value of the tobacco odor intensity after use was an average of 2.7, the judgment value of the tobacco odor intensity after washing with water was an average of 1.6, and the judgment value of the tobacco odor intensity after reuse was an average of 2.9. .

[Example 3]
(Fiber sheet)
The same fiber sheet as in Example 1 was used.

(Porous body)
Fine particle activated carbon “Shirakaba E-25kN” (manufactured by Nippon Enviro Chemical Co., Ltd.) having an average particle size of 20 μm was used.

(Chemical deodorant)
The same drug as in Example 1 was used.

(Filter material)
A filter medium having a deodorizing agent deposition amount of 20 g / m ² , a chemical adhering amount of 2.0 g / m ² and a total basis weight of 71 g / m ² was used in the same manner as in Example 1 except that the deodorizing agent was changed to the above-mentioned activated carbon. .

  This filter medium had an initial deodorization performance of 37.9%, a deodorization performance after washing with water of 35.5%, and a drying time of 18 hours.

  In addition, the average value of tobacco odor intensity after use was 2.5, the average value of tobacco odor intensity after washing was 1.7, and the average value of tobacco odor intensity after reuse was 2.5. .

[Example 4]
(Fiber sheet)
The same fiber sheet as in Example 1 was used.

(Porous body)
Hydrophobic zeolite “Absent 1000” with an average particle size of 20 μm (manufactured by Union Showa Co., Ltd.) 35 mass%, hydrophobic porous silica “Silo Hovic” with an average particle size of 5 μm (Fuji Silysia Chemical Co., Ltd.) 65 mass % Mixture was used.

(Chemical deodorant)
The same drug as in Example 1 was used.

(Filter material)
Except for changing the deodorant to the above zeolite mixed products in the same manner as in Example 1, deodorants adhesion amount 20 g / ^{m 2,} the drug impregnated amount 2.0 g / ^{m 2,} the filter media of the total basis weight of 71 g / ^{m 2} used.

  This filter medium had an initial deodorization performance of 36.1%, a deodorization performance after washing with water of 32%, and a drying time of 18 hours. In addition, the average value of tobacco odor intensity after use was 2.5, the average value of tobacco odor intensity after washing was 1.7, and the average value of tobacco odor intensity after reuse was 2.5. .

[Example 5]
(Fiber sheet)
A fiber group composed of a polyester fiber having a fineness of 3 dtex, a polyester fiber having a fiber length of 10 mm, a mass of 17 dtex, a vinylon fiber having a fiber length of 18 mm, a mass of 17%, a fineness of 6.7 dtex, a fiber length of 10 mm, 53% of vinylon fiber, and a pulp of 19%. A fiber sheet having a basis weight of 35 g / m ² , which was processed into a non-woven fabric by a wet papermaking method, and the same styrene / acrylic resin binder as in Example 1 adhered to 25% by mass of the whole fiber was used.

(Porous body)
The same activated carbon as in Example 3 was used.

(Chemical deodorant)
The same drug as in Example 1 was used.

(Filter material)
The above-mentioned fiber sheet is dispersed in an aqueous dispersion in which 8% by mass of the above-mentioned deodorizer and 2% by mass of the same styrene / acrylic resin as in Example 1 are dispersed in water to which 0.03% of the above-mentioned chemical deodorant is added. impregnated, deodorants adhesion amount 23 g / ^{m 2,} the drug impregnated amount 2 g / ^{m 2,} was used filter media of the total basis weight of 67 g / ^{m 2.}

  This filter medium had an initial deodorization performance of 35.8%, a deodorization performance after washing with water of 33.3%, and a drying time of 24 hours. The average value of tobacco odor intensity after use was 2.5, the average value of tobacco odor intensity after washing was 1.2, and the average value of tobacco odor intensity after reuse was 2.4. .

[Example 6]
(Fiber sheet)
80% by mass of polyester fiber with a fiber length of 24 mm (10% by mass with a fineness of 1.3 dtex, 30% by mass with a fineness of 3 dtex, 40% by mass with a fineness of 6 dtex), a vinylon fiber 15 with a fineness of 17 dtex and a fiber length of 12 mm A fiber having a weight of 42 g / m ² , in which a fiber group composed of 5% by mass of pulp is processed into a non-woven fabric by a wet papermaking method, and the same styrene / acrylic resin binder as in Example 1 is adhered to 25% by mass of the entire fiber. A sheet was used.

(Porous body)
The same activated carbon as in Example 3 was used.

(Chemical deodorant)
The same drug as in Example 1 was used.

(Filter material)
A filter medium having a deodorizing agent adhesion amount of 18 g / m ² , a chemical adhering amount of 1.8 g / m ² and a total basis weight of 69 g / m ² was used in the same manner as in Example 1 except that the fiber sheet was changed to the one described above. .

  This filter medium had an initial deodorization performance of 35.8%, a deodorization performance after washing with water of 33.3%, and a drying time of 20 hours. Moreover, the average value of the tobacco odor intensity after use was 2.7, the average value of the tobacco odor intensity after washing was 1.4, and the average value of the tobacco odor intensity after reuse was 2.6. .

[Example 7]
(Fiber sheet)
The same fiber sheet as in Example 6 was used.

(Porous body)
The same activated carbon as in Example 3 was used.

(Chemical deodorant)
Adipic acid dihydrazide “Chemcat H6000S” (manufactured by Otsuka Chemical Co., Ltd.) was used.

(Filter material)
The above-mentioned deodorizing agent 8% by mass and the same styrene / acrylic resin 1.5% by mass as in Example 1 were uniformly dispersed in water containing 1.5% by mass of the above-mentioned chemisorbing agent. A fiber sheet was impregnated, and a filter medium having a deodorant adhering amount of 20 g / m ² , a chemical adhering amount of 3.0 g / m ² and a total basis weight of 69 g / m ² was used.

  This filter medium had an initial deodorization performance of 51.1%, a deodorization performance after washing with water of 46.3%, and a drying time of 20 hours. Moreover, the determination value of the tobacco odor intensity after use was 1.9, the determination value of the tobacco odor intensity after washing with water was 1.0, and the determination value of the tobacco odor intensity after reuse was 1.9.

[Example 8]
(Fiber sheet)
The same fiber sheet as in Example 6 was used.

(Porous body)
The same activated carbon as in Example 3 was used.

(Chemical deodorant)
Potassium carbonate was used.

(Filter material)
In a dispersion obtained by uniformly dispersing 8% by mass of the above deodorizer and 1.5% by mass of the same styrene / acrylic resin as in Example 1 in an aqueous solution in which 3.0% by mass of the above chemical adsorbent was dissolved. The above-mentioned fiber sheet was impregnated, and a filter medium having a deodorant adhering amount of 21 g / m ² , a chemical adhering amount of 4 g / m ² and a total basis weight of 70 g / m ² was used.

  This filter medium had an initial deodorization performance of 47.3%, a deodorization performance after washing with water of 42.1%, and a drying time of 20 hours. Moreover, the average value of the tobacco odor intensity after use was 2.0, the average value of the tobacco odor intensity after washing was 1.2, and the average value of the tobacco odor intensity after reuse was 2.0. .

[Example 9]
(Filter material)
The total basis weight obtained by uniformly spreading ethylene / vinyl acetate copolymer powder on a polypropylene melt blown nonwoven fabric having a basis weight of 30 g / m ² for 6 g / m ² minutes, heating to melt the powder, and laminating and bonding the same filter media as in Example 7 A high dust collection filter medium of 105 g / m ² was used.

  This filter medium had an initial deodorization performance of 53.6%, a deodorization performance after washing with water of 49.9%, and a drying time of 23 hours. The average value of the tobacco odor intensity after use was 2.1, the average value of the tobacco odor intensity after washing was 1.3, and the average value of the tobacco odor intensity after reuse was 2.1. .

[Example 10]
(Filter material)
The same filter medium as in Example 9 was used.

(Filter unit)
A filter medium similar to that in Example 9 was pleated to a height of 30 mm and stored in a frame having a filter size of 259 mm in width, 471 mm in length, and 32 mm in thickness, and air for an air cleaner having a filter medium area of 2.0 m ^2. A filter was used.

  This filter unit had an initial deodorization performance of 86.5%, a deodorization performance after washing with water of 75.3%, and a drying time of 24 hours. The average value of the tobacco odor intensity after use was 1.7, the average value of the tobacco odor intensity after washing was 1.0, and the average value of the tobacco odor intensity after reuse was 1.6. .

[Comparative Example 1]
(Fiber sheet)
A 100% polyester fiber spunbonded nonwoven fabric “Lutradur LD7250W” (manufactured by Japan Lutraville Co., Ltd.) was used.

(Porous body)
The same activated carbon as in Example 3 was used.

(Chemical deodorant)
The same adipic acid dihydrazide as in Example 7 was used.

(Filter material)
The fiber sheet except for those described above, deodorant adhesion amount 23 g / ^{m 2} in the same manner as in Example 7, the drug impregnated amount 4g / ^{m 2,} was used filter media of the total basis weight of 84 g / ^{m 2.}

  This filter medium had an initial deodorization performance of 56.7%, a deodorization performance after washing with water of 41.5%, and a drying time of 15 hours. The average value of the tobacco odor intensity after use was 1.9, the average value of the tobacco odor intensity after washing was 1.8, and the average value of the tobacco odor intensity after reuse was 3.4. .

[Comparative Example 2]
(Fiber sheet)
55% by mass of vinylon fiber having a fiber length of 12 mm (20% by mass of fiber having a fineness of 6.7 dtex and 35% by mass of fiber having a fineness of 17 dtex), 15% of vinylon fiber having a fineness of 17 dtex and a fiber length of 18 mm, and fiber length of 2.2 dtex A fiber group composed of 10% by mass of 32 mm rayon fiber and 20% by mass of pulp was processed into a non-woven fabric by a wet papermaking method, and a styrene / acrylic resin binder similar to Example 1 was adhered to 25% by mass of the entire fiber. A 42 g / m ² fiber sheet was used.

(Porous body)
The same activated carbon as in Example 3 was used.

(Chemical deodorant)
The same adipic acid dihydrazide as in Example 7 was used.

(Filter material)
A filter medium having a deodorizing agent deposition amount of 20 g / m ² , a chemical adhering amount of 3 g / m ² and a total basis weight of 72 g / m ² was used in the same manner as in Example 7 except that the fiber sheet was as described above.

  This filter medium had an initial deodorization performance of 51.8%, a deodorization performance after washing with water of 47.7%, and a drying time of 63 hours. Moreover, the average value of the tobacco odor intensity after use was 2.0, the average value of the tobacco odor intensity after washing was 1.3, and the average value of the tobacco odor intensity after reuse was 2.0. .

[Comparative Example 3]
(Fiber sheet)
The same fiber sheet as in Example 6 was used.

(Porous body)
Fine particle activated carbon “Shirakaba E-25kN” (manufactured by Nippon Enviro Chemical Co., Ltd.) having an average particle diameter of 46 μm was used.

(Chemical deodorant)
The same adipic acid dihydrazide as in Example 7 was used.

(Filter material)
A deodorizing agent adhesion amount of 25 g / m ² , a chemical adhering amount of 5 g / m ² , and a total basis weight of 82 g were used in the same manner as in Example 7 except that the above-mentioned deodorizing agent was used and the dispersion amount was 8 mass% A filter medium of / m ² was used.

  This filter medium had an initial deodorization performance of 55.3%, a deodorization performance after washing with water of 39.1%, and a drying time of 48 hours. The average value of the tobacco odor intensity after use was 1.7, the average value of the tobacco odor intensity after washing with water was 1.2, and the average value of tobacco odor intensity after reuse was 2.1. .

[Comparative Example 4]
(Fiber sheet)
The same fiber sheet as in Example 6 was used.

(Porous body)
The porous body was not used.

(Chemical deodorant)
The same adipic acid dihydrazide as in Example 7 was used.

(Filter material)
The above fiber sheet was dispersed in a dispersion obtained by uniformly dispersing 1.5% by mass of the same styrene / acrylic resin as in Example 1 in an aqueous solution in which 8.0% by mass of the same chemical adsorbent as in Example 7 was dissolved. A filter medium impregnated and having a chemical adhering amount of 1.5 g / m ² and a total weight of 50 g / m ² was used.

  This filter medium had an initial deodorization performance of 12.1%, a deodorization performance after washing with water of 4.2%, and a drying time of 20 hours. The cigarette odor intensity after use was 4.3, the cigarette odor intensity after washing was 3.1 on average, and the cigarette odor intensity after reuse was 4.5 on average. It was.

[Comparative Example 5]
(Fiber sheet)
The same fiber sheet as in Example 6 was used.

(Porous body)
The same activated carbon as in Example 3 was used.

(Chemical deodorant)
The same adipic acid dihydrazide as in Example 7 was used.

(Filter material)
Deodorant adhesion amount 20 g / m ² , chemical adhering amount 5 g / m ² , total basis weight in the same manner as in Example 7 except that the addition amount of the chemical adsorbent as in Example 7 was 8.0%. A filter medium of 75 g / m ² was used.

  This filter medium had an initial deodorization rate of 61.6%, a deodorization rate after washing with water of 39.2%, and a drying time of 20 hours. The average value of the tobacco odor intensity after use was 1.7, the average value of the tobacco odor intensity after washing was 1.3, and the average value of the tobacco odor intensity after reuse was 3.9. .

[Comparative Example 6]
(Fiber sheet)
The same fiber sheet as in Example 6 was used.

(Porous body)
The same activated carbon as in Example 3 was used.

(Chemical deodorant)
The same adipic acid dihydrazide as in Example 7 was used.

(Filter material)
Examples 7 and deodorant adhesion amount 20 g / m 2 in the same way as in Example 7 except for using 0.8 wt% of the amount of similar chemical adsorption ^agent, was used filter media of the total basis weight of 67 g / m ² .

  This filter medium had an initial deodorization performance of 28.6%, a deodorization performance after washing with water of 27.3%, and a drying time of 20 hours. Moreover, the average value of the tobacco odor intensity after use was 3.2, the average value of the tobacco odor intensity after washing was 2.6, and the average value of the tobacco odor intensity after reuse was 4.3. .

In addition, the result of Examples 1-10 is put together in Table 2, and the result of Comparative Examples 1-6 is put together in Table 3. In the table, “→” means the same as the condition described on the left side of the column.

  In Examples 1 to 10, a sheet in which both hydrophobic and hydrophilic fibers are mixed is used as a base material, a hydrophobic porous body having a small particle size is attached thereto, and a chemical adsorbent is further added in an appropriate amount. Yes. For this reason, it turns out that the various components of tobacco odor are deodorized. Moreover, it turns out that the re-generation of odor is suppressed. Washing with water removes odorous components adhering to both the deodorizer and the fiber, and the drying time is short. From this result, it can be seen that the air filter medium of the present example has a deodorizing performance that prevents the generation of an unpleasant odor such as tobacco odor, a regenerating performance by washing, and a repeated usability. With respect to preventing the reoccurrence of tobacco odor, it can be said that the performance is further improved by using activated carbon or hydrophobic zeolite as a deodorizer and adding a hydrazine compound or an alkali metal compound.

  For each example, Comparative Example 1 uses only hydrophobic fibers in the fiber sheet, and thus cannot remove tobacco odor components attached to the fibers by washing with water. For this reason, when it uses repeatedly, the odor intensity | strength will improve at a high ratio.

  In contrast to Comparative Example 1, Comparative Example 2 uses only hydrophilic fibers in the fiber sheet. For this reason, the fiber retains a large amount of water after washing with water, indicating that the drying time is significantly increased.

  Comparative Example 3 uses a porous body having a large average particle diameter. For this reason, it has shown that the moisture content which a porous body hold | maintains becomes large and has time for drying. Therefore, the rate at which the chemical deodorizer is eluted or removed is large, indicating that the deodorizing performance is lowered and the generated tobacco odor intensity is increased.

  Since Comparative Example 4 does not use a porous body, the deodorizing performance is remarkably low, and all tobacco odor components adhere to the fiber surface, indicating that a strong odor recurs.

In Comparative Example 5, since the amount of chemical deodorant added is too much, the deodorization performance is greatly reduced by washing with water.
Large difference in odor intensity before and after cleaning. For this reason, it shows that it is perceived as an odor exceeding the actual odor intensity for the user.

  Comparative Example 6 shows that the amount of chemical deodorant attached is small, the initial deodorizing performance itself is not sufficient, and the tobacco odor strength after use is large.

The filter material for an air filter according to the present invention of the present invention is mainly used for a cleaning / regenerating air filter for an air purifier used in a general house, a pet-compatible apartment, an elderly entrance facility, a hospital, an office, and the like. Furthermore, it is preferably used as an air filter for normalizing the air in the interior of a vehicle such as an automobile or a railway vehicle, an air filter for an air conditioner, an intake / disposal filter for OA equipment, a building air conditioner, or an air filter for individual air conditioner.

Claims (6)

  An air filter medium obtained by attaching a porous material having an average particle size of 40 μm or less and a chemical deodorant of 2 to 5 mass% to a fiber sheet containing hydrophobic fibers and hydrophilic fibers.   The air filter medium according to claim 1, wherein the porous body is hydrophobic and includes at least either activated carbon or hydrophobic zeolite.   The air filter medium according to claim 1 or 2, wherein the fiber sheet contains 10 to 80 mass% of hydrophobic fibers.   The air filter medium according to any one of claims 1 to 3, wherein the chemical deodorizer contains at least one of a hydrazide compound and an alkali metal compound, and in the test method based on the JEMA 1467 deodorization performance test method, the initial deodorization rate of the filter medium Is a highly deodorized air filter medium, which is 40% or more.   A highly dust-collecting air filter medium, in which an electret nonwoven fabric composed of hydrophobic fibers is integrally laminated on the air filter medium according to claim 1. A cleaning regeneration type air filter for an air purifier, comprising the air filter medium according to any one of claims 1 to 5.