JP2002017832A - Deodorizing filter and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deodorizing filter which can keep excellent initial deodorizing performance through a long period by making catalyst operation sufficient without degrading the initial performance of an absorbent, and a method for manufacturing the filter like this. SOLUTION: In the deodorizing filter of three-layer lamination structure consisting of a holding nonwoven fabric 2 including the absorbent 5 held by a binder and dust-preventing nonwoven fabrics 3 and 4 between which this holding nonwoven fabric is supported on both sides of it, the catalyst for treating absorbed gas is carried on a part except the absorbent, such as the binder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing filter which is suitably used for air-conditioning-related devices and equipment in, for example, general households, buildings, and automobiles, and is used for purifying the interior of a room. The redox reaction using a room temperature catalyst that shows activity at room temperature fixes and decomposes the gas components adsorbed on the adsorbent such as activated carbon, regenerates the adsorbent's adsorption performance, and extends the life of the filter over a long period. The present invention relates to a deodorizing filter that can be held and a method for producing such a deodorizing filter.

[0002]

2. Description of the Related Art Adsorbents such as activated carbon are often used to remove gas components contained in tobacco smoke and exhaust gas as odor components, but these adsorbents alone have a short deodorizing life. Therefore, various types of deodorizing catalysts may be used in order to exert a deodorizing effect on gas components over a long period of time.

[0003] For example, a deodorant capable of directly adhering and supporting a metal catalyst component on an adsorbent such as activated carbon and maintaining the deodorizing performance for a long time by its catalytic action is disclosed in, for example, JP-A-9-262273. JP-A-7-15536
No. 6 has been proposed.

[0004] The catalyst disclosed in the above publication is a room temperature catalyst, that is, a catalyst having catalytic activity at room temperature and comprising a chemically reacting metal, metal oxide or metal chloride, and having a specific gas component. It has oxidizing power and reducing power. Further, as the use form of the deodorizing material family, there are known ones formed into a honeycomb shape, ones fixed to the inner wall of a honeycomb core, and the like.

[0005]

However, in a conventional deodorizing material in which a catalyst is directly attached to and supported by such an adsorbent, most of the macropores on the outer surface of the adsorbent are blocked by catalyst particles. In such a case, there is a problem that the initial performance of the adsorbent serving as a base is lowered, and a desired deodorizing performance cannot be obtained.

[0006] Even when the catalyst is present inside the adsorbent, in the case of a type in which the gas adsorbed by the catalyst reacts with oxygen in the air, the diffusion of oxygen into the adsorbent is restricted from the outside of the adsorbent. However, there is a problem that the reaction does not proceed sufficiently due to the slowdown.

Further, since the catalyst and the adsorbent are integrated by attaching and supporting the catalyst on the adsorbent, if the gas is a poisoning substance of the catalyst, the catalyst performance is likely to deteriorate. There is a problem, and the elimination of these problems has been a problem in a conventional deodorizing material in which a catalyst is supported on an adsorbent and integrated.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional deodorizing material, and is capable of exhibiting a sufficient catalytic action without lowering the initial performance of the adsorbent. A deodorizing filter that can maintain the life of a deodorizing filter over a long period of time by regenerating the adsorption performance of the material and, even in the presence of a poisoning substance of the catalyst component, has a small deterioration in catalytic performance. It is an object of the present invention to provide a method for producing such a deodorizing filter.

[0009]

Means for Solving the Problems In order to achieve the above object, the present inventor has been diligently studying the types of adsorbents and catalysts, as well as the methods for supporting them, in order to obtain an oxidation-reduction effect. , Directly attached to adsorbents such as conventional activated carbon,
By bringing the catalyst that has been carried and integrated into contact with the adsorbent in a state of being close to the adsorbent, specifically, without directly integrating with the adsorbent, the catalyst can be adsorbed such as a binder. The inventors have found that the initial adsorbing performance can be prevented from deteriorating by supporting the catalyst on other components and arranging and contacting the catalyst near the adsorbent.

[0010] The present invention is based on such findings, and the deodorizing filter according to claim 1 of the present invention comprises:
A deodorizing filter having a three-layered laminated structure of a nonwoven fabric for holding containing an adsorbent held by a binder and a nonwoven fabric for dust removal sandwiching the nonwoven fabric for holding from both sides, and is adsorbed by the adsorbent. Among the constituent members forming the deodorizing filter, the catalyst for treating the gas is characterized in that it is configured to be present in the constituent members other than the adsorbent. It is a means to solve the problem.

As one embodiment of the deodorizing filter according to the present invention, in the deodorizing filter according to the second aspect, the catalyst is contained in a binder, and as in the embodiment, in the deodorizing filter according to the third aspect, A configuration in which the catalyst is contained in at least one of the nonwoven fabric for holding and the nonwoven fabric for dust removal, and as an embodiment,
In the deodorizing filter according to the fourth aspect, the catalyst is arranged in a range of 2 mm from the center of the cross section of the deodorizing filter. In the deodorizing filter according to the fifth aspect, the catalyst is ruthenium, platinum, palladium, iridium, 7. A structure comprising at least one selected from the group consisting of manganese, copper, cobalt, nickel, gold, a simple substance of these metals, and oxides and chlorides of these metals.
In the deodorizing filter according to the above, the catalyst is configured to be at least one selected from ruthenium metal, ruthenium oxide and chloride. In the deodorizing filter according to claim 7, configured to 0.05 to 10 wt% of the catalyst relative adsorbent are interposed binder, in the deodorizing filter according to claim 8, nonwoven 1 m ² per 25 configuration adsorbent ~500g is are be supported, in the deodorizing filter further according to claim 9, configured to adsorbent nonwoven 1 m ² per 50~300g is are is supported, in a deodorizing filter according to claim 10, Average particle size of adsorbent is 0.05 ~
In the deodorizing filter according to the eleventh aspect, the average particle size of the adsorbent is 0.2 to 1.2 m.
The deodorizing filter according to claim 12, wherein the adsorbent is activated carbon, activated carbon fiber, zeolite,
14. A deodorizing filter according to claim 13, wherein the adsorbent is activated carbon, wherein at least one selected from the group consisting of activated clay, sepiolite, ferriferrite, alumina, silica gel, and alumina-silica is used. The deodorizing filter according to the above is characterized in that the adsorbent is configured to contain activated carbon that adsorbs a basic gas. Further, claim 15
In the deodorizing filter according to the above, the catalyst is present on the surface of the binder, and in the deodorizing filter according to the present invention, the binder is at least one of a thermoplastic hot-melt type granular adhesive and a latex. In the deodorizing filter according to claim 17, the binder is a thermoplastic hot-melt type granular adhesive, and in the deodorizing filter according to claim 18, the binder is 2 to 100% by mass based on the adsorbent. In the deodorizing filter according to claim 19, the adsorbent is supported on the nonwoven fabric by the binder of 20 to 80% by mass with respect to the adsorbent. Such a configuration in the deodorizing filter is a solution for solving the above-mentioned conventional problems. It is characterized in that the content was.

In addition, in the method for producing a deodorizing filter according to claim 20 of the present invention, the step of supporting the catalyst on the binder and the step of forming the holding nonwoven fabric on the dust removing nonwoven fabric with the holding nonwoven fabric placed on the dust removing nonwoven fabric. A step of spraying a mixture of the binder supporting the catalyst obtained in the above step and the adsorbent from above, and placing another non-woven fabric for dust removal on the non-woven fabric for holding, and pressing under heat to form a three-layer laminate; As an embodiment of the method for producing a deodorizing filter according to the present invention, in the production method according to claim 21, a catalyst and / or a precursor of the catalyst are contained as a method for supporting a catalyst on a binder. A method of immersing a binder in a solution to be sprayed or spraying the solution on the binder, followed by drying, and wherein the method for producing a deodorizing filter according to claim 22 is used. The method for producing a deodorizing filter according to claim 23, wherein an aqueous solution of ruthenium chloride hydrate having a solid content of 1 to 10% by mass is used as the solution containing the catalyst and / or the precursor of the catalyst. ,
When spraying the mixture of the binder and the adsorbent supporting the catalyst on the non-woven fabric for holding, it is characterized in that the binder and the adsorbent are uniformly mixed and then sprayed.
Such a configuration in the method for manufacturing a deodorizing filter is used as means for solving the above-mentioned conventional problems.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Deodorizing filter 1 according to the present invention
As shown in FIG. 1, a nonwoven fabric 3 including a nonwoven fabric 2 for holding, which contains an adsorbent 5 held by a binder, and two nonwoven fabrics 3 and 4 for dust removal which sandwich the nonwoven fabric 2 for holding,
A catalyst for treating the gas adsorbed by the adsorbent, wherein the catalyst for treating the gas adsorbed by the adsorbent forms the deodorizing filter 1 except for the adsorbent 5, that is, Binder and non-woven fabric for holding 2
And it is contained in at least any part of the nonwoven fabrics 3 and 4 for dust removal.

With such a configuration, the catalyst is not directly attached to the adsorbent, and the adsorbent for adsorbing gas and the catalyst come into contact with or close to each other, so that the oxidation-reduction effect is effectively exhibited. Therefore, a deodorizing filter having excellent initial performance and exhibiting excellent deodorizing performance over a long period of time is obtained.

That is, in the deodorizing filter according to the present invention, for example, a catalyst in the form of a metal, a metal oxide or a chloride, or a binder processed with an aqueous solution containing a precursor thereof is used to adsorb activated carbon or the like. Since the catalyst is supported on constituent members other than the adsorbent 5 by fixing the material to the non-woven fabric, for example, as shown in FIG. Alternatively, since it is attached to the outer surface of the adsorbent 5, the adsorbent 5 is adsorbed like a conventional deodorant in which the catalyst 6 is directly supported on the adsorbent 5 as shown in FIG. The site 5 a is not blocked by the particles of the catalyst 6, and the adsorption performance inherent to the adsorbent 5 is exhibited. Then, the component to be deodorized (hereinafter, abbreviated as “odor component”) adsorbed on the adsorbent 5 is decomposed by a catalytic reaction, and the adsorption site 5a of the adsorbent 5 is vacated to regenerate the adsorption performance. Therefore, the initial performance of the adsorbent 5 and the regeneration performance by the catalytic reaction are compatible.

When the catalyst 6 oxidizes and decomposes the odor component adsorbed on the adsorbent 5 using oxygen in the air, FIG.
In the conventional deodorizing material shown in (b), the diffusion of oxygen into the macropores of the adsorbent 5 is slower than that of the outer surface.
The reaction did not proceed sufficiently for the catalyst 6 located inside the adsorbent 5, but in the deodorizing filter 1 according to the present invention, as shown in FIG. Since it exists on the outer surface, it easily comes into contact with oxygen in the air, and the catalytic reaction proceeds quickly.

In general, a filter having a three-layer structure has characteristics that it is easy to adjust adsorption performance, dust collection performance, and airflow resistance.
Fine adjustment is possible according to the application. That is, the dust collection performance is selected by selecting a nonwoven fabric, the adsorption performance is adjusted by adjusting the basis weight of the adsorbent, the folding method (folding dimension) of the fold structure in use, and the ventilation resistance is further reduced by the nonwoven fabric. Can be changed by selecting the filter and adjusting how the filter is folded during use. That is, the three-layer structure can be said to be a structure in which three elements necessary for the filter can be easily adjusted according to the purpose of use.

At this time, the diameter of the fiber constituting the nonwoven fabric is 2
0 to 35 μm, the basis weight thereof is 20 to 100 g / m ² in the case of the holding nonwoven fabric ² , and the dust removal nonwoven fabric 3
In cases 4 and 4, 10 to 100 g / m ² is desirable. The deodorizing filter 1 has a thickness of 0.5 mm.
To 4.0 mm is desirable.

In such a deodorizing filter 1, as described above, the catalyst 6 is made of a component other than the adsorbent, specifically, a binder as described in claim 2, or a binder as described in claim 3. The nonwoven fabric 2 for holding and the nonwoven fabrics 3 and 4 for dust removal as described above can be included. At this time, the catalyst 6 is close to the adsorbent 5, specifically, within 2 mm from the center of the cross section of the deodorizing filter 1, that is, the center in the thickness direction of the holding nonwoven fabric 2 as described in claim 4. Desirably, it exists at a nearby position.

In the present invention, as the adsorbent and the catalyst, activated carbon, ruthenium (metal) and oxides and chlorides of ruthenium can be used as described in claims 12 and 5. Activated carbon fiber, zeolite, activated clay, sepiolite, ferriferrite, alumina, silica gel, alumina
As the silica and the catalyst, platinum, palladium, iridium, manganese, copper, cobalt, nickel, gold, simple metals, oxides and chlorides of these metals can also be used. However, in consideration of these performances, availability in the market, variety of selections, stability as material, safety, and economical efficiency, as described in claims 13 and 6, Preferred are activated carbon and ruthenium simple substance (metal), oxides and chlorides. These adsorbents have a large area per unit weight (specific surface area),
It has a high frequency of contact with gas and is excellent in adsorption capacity. The catalyst has excellent catalytic performance near room temperature.

The basis weight of the adsorbent is preferably 25 to 500 g / m ² , as described in claim 8. That is, when the basis weight of the adsorbent is less than 25 g / m ² , the adsorbing performance of the deodorizing filter is not sufficient, and when it exceeds 500 g / m ² , the air permeability tends to be impaired.

[0022] Further, as described in claim 9, 5
0-300 g / m < ² > is preferable.

As described in claim 10, the size of the adsorbent is 0.05 to 1.
If the average particle size is less than 0.05 mm, the weight per unit area cannot be sufficiently secured, and the average particle size is less than 1.7 mm.
If it is larger than this, the thickness of the filter becomes large, and the folding process becomes difficult. The average particle size of the adsorbent is determined by calculating the peripheral length from the image of the adsorbent particles, and using the diameter of a circle whose circumference is the length as the average particle size.

Further, as described in claim 11, the average particle size is preferably in the range of 0.2 to 1.2 mm.

Further, the amount of the catalyst contained in the deodorizing filter is preferably in the range of 0.05 to 10% by mass based on the adsorbent. In other words, when the amount of the catalyst is less than 0.05% by mass, a sufficient catalytic action cannot be obtained, and when the amount exceeds 10% by mass, the effect is saturated. Can not be confirmed.

If the odor component contains a basic gas, the basic gas acts as a poisoning substance for the catalyst. Therefore, in order to reduce the deterioration of the catalyst due to this, it is possible to add an impregnated activated carbon that adsorbs a basic gas, as described in claim 14. As such an impregnated activated carbon, for example, known ones such as activated carbon impregnated with phosphoric acid can be used. The amount of attachment
It is desirable to set it in the range of 1 to 20% by mass of the entire adsorbent. If the amount is less than 1% by mass, the function as the impregnated activated carbon cannot be sufficiently obtained. If the amount exceeds 20% by mass, other gases cannot be adsorbed sufficiently, and the original adsorbing performance as an adsorbent becomes insufficient. When the adsorbent contains an impregnated activated carbon that favorably adsorbs a basic gas, when the odor component containing the basic gas passes through the deodorizing filter, the basic gas is preferentially adsorbed on the activated carbon, Since the adsorbed basic gas is not easily desorbed, poisoning of the catalyst is suppressed as a result.

As a binder for fixing the adsorbent such as activated carbon to the holding nonwoven fabric 2, a thermoplastic hot-melt type granular adhesive or latex can be used. Considering ease of use, granular hot-melt pressure-sensitive adhesives (hereinafter, referred to as “hot-melt powder”) are more preferable. As hot melt powder,
For example, polyethylene powder, polyester powder, vinyl chloride powder and the like can be used.

[0028] The amount of the binder used is defined in claim 18.
As described in the above, based on the weight of the adsorbent, 2
The range is preferably from 100 to 100% by mass. If the amount of the binder is less than 2% by mass, the adsorbent cannot be sufficiently retained on the nonwoven fabric, and the adsorbent may be detached during use of the deodorizing filter. This is because the film may be hindered by adsorption, so that the adsorption performance may be affected.

Further, as described in claim 19, the range is preferably 20 to 80% by mass based on the weight of the adsorbent.

Such a deodorizing filter can be formed, for example, by the method described in claim 20, that is, the step of supporting a catalyst on a binder and the step of placing the holding nonwoven fabric 2 on the dust removing nonwoven fabric 3, Spraying the mixture of the binder supporting the catalyst and the adsorbent 5 obtained in the above from above the non-woven fabric for holding 2, placing another non-woven fabric for dust removal 4 on the non-woven fabric for holding 2, and applying heat and pressure. As a method for processing a catalyst into a binder, an aqueous solution containing a catalyst or a catalyst precursor is added to the binder as described in claim 21. A method of spraying the solution onto the binder or dipping the binder in the solution can be adopted as a method of adding the solution.

The solid content of the catalyst or catalyst precursor, for example, ruthenium chloride hydrate, contained in the aqueous solution is preferably 1 to 10% by mass, as described in claim 22. That is, when the solid content of the catalyst is less than 1% by mass, the required amount of supported catalyst is insufficient, and sufficient catalytic action is hardly obtained. When the solid content exceeds 10% by mass, the dispersibility of the catalyst becomes poor. This is because the catalyst tends to be deteriorated and cannot be uniformly supported. At this time, an auxiliary agent for improving the dispersibility of the catalyst can also be added as needed for adjusting the viscosity to make it easier for the catalyst to be supported on the binder. For example, a thermoplastic resin such as a vinyl acetate copolymer, a cellulose derivative, a polymethyl methacrylate, or a polyurethane, an alumina sol, a silica sol, and the like can be given.

When the mixture of the binder containing the catalyst and the adsorbent is sprayed on the nonwoven fabric for holding, the mixture shown in FIG.
As shown in (a), a binder 7 is provided around the adsorbent 5.
Is desirably uniformly attached and fixed to the fibers 8 of the nonwoven fabric 2. This is to ensure that the adsorbent 5 and the catalyst 6 are kept in close proximity to the non-woven fabric via the binder 7, and for this purpose, as described in claim 23, It is preferable that the adsorbent is uniformly mixed and dispersed beforehand and then sprayed. As a mixing method for this, a known method such as putting an adsorbent and a binder in a V blender and rotating the mixture can be used.

The deodorizing filter having such a three-layer structure is
In order to increase the amount of adsorbent introduced into the air conditioner, increase the frequency of contact with the inflowing air, and reduce the ventilation resistance, as shown in FIG. 3, the deodorizing filter 1 has a folded structure. It is preferable that the filter 1 in the folded state is housed in the storage unit 11 to form the filter element 10. By adopting such a structure,
The surface area per unit volume is increased, and the efficiency of collecting dust, odor and the like is improved.

In an air conditioner equipped with such a deodorizing filter, first, an odor component in air flowing through the device and passing through the filter is adsorbed and removed by an adsorbent in the filter. Next, the odor component adsorbed by the adsorbent moves to the catalyst close to the adsorbent, and the odor component is decomposed by the catalytic reaction. As a result, the adsorption site of the adsorbent in the filter becomes vacant, so that further adsorption and removal of the odor component is continuously performed. Even if the odor component contains a poisonous component of the catalyst, it is once adsorbed by the adsorbent. Longer life and higher performance can be achieved by devising a mixture with an adsorbent that is designed to easily adsorb components.

[0035]

The deodorizing filter according to claim 1 of the present invention has a three-layer laminated structure comprising a holding nonwoven fabric containing an adsorbent held by a binder and a dust removing nonwoven fabric sandwiching the holding nonwoven fabric on both sides. A deodorizing filter provided, wherein a catalyst for treating the gas adsorbed by the adsorbent is a constituent member other than the adsorbent, for example, a binder as described in claim 2, or a catalyst as described in claim 3. Since the catalyst is present in at least one of the holding nonwoven fabric and the dust removing nonwoven fabric, and the catalyst is separated from the adsorbent, the adsorption sites of the adsorbent are blocked by the catalyst particles. It is possible to achieve both the original adsorption performance (initial performance) of the adsorbent and the regeneration performance by the catalytic action, and maintain the deodorizing performance for a long time. It is one that results in an extremely excellent effect that that.

In the deodorizing filter according to claim 4 of the present invention, since the catalyst is present in a close range of 2 mm from the center of the cross section of the deodorizing filter, the odor component adsorbed on the adsorbent can be easily removed. And the adsorption performance can be steadily regenerated. In the deodorizing filter according to claim 5, ruthenium, platinum, palladium, iridium, manganese, copper, cobalt, nickel, gold, these metals, Since one selected from metal oxides and chlorides is used alone or in combination, the above-mentioned catalytic action can be surely exerted even at room temperature, and in the deodorizing filter according to claim 6, In particular, at least one selected from ruthenium metal, ruthenium oxide and chloride as a catalyst Since the material is used, the material can be easily obtained, and the stability and economy can be improved. Since 10% by mass of the catalyst is interposed in the binder, there is an effect that the catalytic action can be reliably exerted without wasting expensive catalyst.

Further, in the deodorizing filter according to claim 8, since 25 to 500 g of the adsorbent is carried per 1 m ² of the nonwoven fabric, the performance as the deodorizing filter is secured without impairing the air permeability of the filter. it can, in the deodorizing filter further according to claim 9, since the adsorbent of the non-woven fabric 1 m ² per 50~300g is are be supported, it is possible to further improve the performance, in the deodorizing filter according to claim 10 Since the adsorbent having an average particle size of 0.05 to 1.7 mm is applied, it is possible to secure the foldability of the filter while appropriately maintaining the basis weight of the adsorbent. In the deodorizing filter according to the eleventh aspect, since an adsorbent having an average particle size of 0.2 to 1.2 mm is applied, the property is further improved. In the deodorizing filter according to the twelfth aspect, the adsorbent is selected from the group consisting of activated carbon, activated carbon fiber, zeolite, activated clay, sepiolite, ferriferrite, alumina, silica gel, and alumina-silica. Since they are used alone or in combination of two or more, each has a large specific surface area and can exhibit excellent adsorption performance. In the deodorizing filter according to claim 13,
Particularly, since activated carbon is used as the adsorbent, it is easy to obtain, and a deodorizing filter excellent in stability and economy can be obtained. In the deodorizing filter according to claim 14, a basic gas is used as the adsorbent. Since the activated carbon is adsorbed, even if the odor component contains a basic gas that acts as a poisoning substance, this gas can be preferentially adsorbed to reduce the poisoning of the catalyst. In the deodorizing filter according to claim 15, since the catalyst is present on the surface of the binder, the catalyst is steadily separated from the adsorption site of the adsorbent, and the adsorption performance of the adsorbent is maintained well. In addition, the deodorizing performance as a deodorizing filter can be maintained for a long time.

Further, in the deodorizing filter according to claim 16, a thermoplastic hot-melt type granular adhesive or latex is used as a binder,
In the deodorizing filter according to the seventeenth aspect, since a thermoplastic hot-melt type granular adhesive is used, the handling and the workability during manufacturing can be improved. In the deodorizing filter according to the above, since the adsorbent is carried on the nonwoven fabric by the binder of 2 to 100% by mass with respect to the adsorbent, the adsorbent can be reliably applied to the nonwoven fabric without causing the adsorption performance deterioration due to the adsorbent surface. An excellent effect of being able to be fixed to is provided. Further, in the deodorizing filter according to the nineteenth aspect, the performance can be further improved by supporting the nonwoven fabric with a binder in an amount of 20 to 80% by mass based on the adsorbent.

In the method for producing a deodorizing filter according to the present invention, the step of supporting the catalyst on the binder, the step of placing the nonwoven fabric for holding on the nonwoven fabric for dust removal, and the step of combining the binder carrying the catalyst and the adsorbent are carried out. A process of spraying the mixture from above the holding nonwoven fabric and a process of placing another dust-removing nonwoven fabric on the holding nonwoven fabric to which the mixture has been sprayed, and then heating and pressing to form a three-layer laminate. Therefore, the deodorizing filter according to the present invention, in which the catalyst is separated from the adsorbent, thereby achieving both the initial performance and the long-term performance, can be efficiently and easily manufactured, and the deodorizing filter according to claim 21 is provided. In the method for producing the catalyst, the catalyst and / or
Alternatively, since the binder is immersed in a solution containing a precursor of the catalyst or the solution is sprayed on the binder and then dried, the catalyst can be easily and reliably supported on the binder. In the method for producing a deodorizing filter according to the above, an aqueous solution of ruthenium chloride hydrate having a solid content of 1 to 10% by mass is used as the solution containing the catalyst and / or the precursor of the catalyst. Amount of the catalyst can be uniformly supported, and in the method for producing a deodorizing filter according to claim 23, when the mixture of the binder and the adsorbent supporting the catalyst is sprayed on the nonwoven fabric for holding, for example, by a V blender or the like , The binder and adsorbent are evenly mixed and then sprayed. It is intended to provide a very excellent effect that the catalyst can be uniformly and reliably fixed through.

[0040]

EXAMPLES The present invention will be described below more specifically based on examples. Note that the present invention is not limited to only such an embodiment.

In each of the following Examples and Comparative Examples, in order to obtain a filter 1 having a three-layer structure as shown in FIG.
A nonwoven fabric 2 having a basis weight of 30 to 100 g / m ² made of polypropylene or PET (polyethylene terephthalate) fiber having a fiber diameter of 20 to 35 μm (3 to 15 denier) is used. 1
5 denier) polypropylene or PET fiber having a basis weight of 30 to 80 g / m ² was used.

Example 1 A hot melt powder was used as a binder, and a ruthenium chloride solution (manufactured by Tanaka Kikinzoku Kogyo KK) having a solid content of 8% was added to the hot melt powder in an amount of 30% by mass based on the hot melt powder. By drying in a high-temperature bath at 80 ° C. for one hour to evaporate water, the room-temperature catalyst was processed. As the adsorbent 5, one having activated carbon particles having a particle size of 100 μm or more as a main component (containing 30% by mass or more) is used, and after being retained on the nonwoven fabric 2 for retention using the binder containing a catalyst. Then, the above-mentioned dust-removing nonwoven fabrics 3 and 4 were overlapped on both sides thereof to obtain a deodorizing filter 1 as shown in FIG. The respective basis weight of the adsorbent 5 and the binder 250 g / m ² and 100 g / m ²
It is. At this time, the amount of the room temperature catalyst contained in the obtained deodorizing filter 1 was 0.96
% By mass.

Example 2 A deodorizing filter 1 was obtained in the same manner as in Example 1 except that the above ruthenium chloride solution was processed by adding 90% by mass to the hot melt powder. At this time, the amount of the normal temperature catalyst contained in the deodorizing filter 1 was 2.88% by mass with respect to the adsorbent 5.

Example 3 A deodorizing filter 1 was obtained in the same manner as in Example 1 except that the solid content of the ruthenium chloride solution was changed to 5% by mass. At this time, the amount of the normal temperature catalyst contained in the deodorizing filter 1 was 0.60% by mass with respect to the adsorbent 5.

Example 4 A deodorizing filter 1 was obtained in the same manner as in Example 1 except that treatment was performed using a palladium nitrate solution having a solid content of 10% instead of the ruthenium chloride solution.
At this time, the amount of the room temperature catalyst contained in the deodorizing filter 1 was 1.20% by mass with respect to the adsorbent 5.

Example 5 A deodorizing filter 1 was obtained in the same manner as in Example 1 except that the treatment was performed using a copper nitrate solution having a solid content of 8% instead of the ruthenium chloride solution. At this time, the amount of the room temperature catalyst contained in the deodorizing filter 1 was 0.96% by mass with respect to the adsorbent 5.

Example 6 A deodorizing filter 1 was obtained in the same manner as in Example 1 except that pentasil-type zeolite (silica-alumina ratio: 30) was used as the adsorbent 5 instead of the activated carbon.

Example 7 A deodorizing filter 1 was obtained in the same manner as in Example 1 except that activated carbon fibers were used as the adsorbent 5 instead of the activated carbon.

Example 8 The adsorbent 5 was replaced by a mixture of 30 parts by mass of activated carbon impregnated with ammonia and trimethylamine and 70 parts by mass of the activated carbon used in Example 1 in place of the activated carbon.
Deodorizing filter 1 was obtained in the same manner as in Example 1 above.

Example 9 The adsorbent 5 was replaced by a mixture of 50 parts by mass of activated carbon impregnated with ammonia and trimethylamine and 50 parts by mass of the activated carbon used in Example 1 in place of the activated carbon.
Deodorizing filter 1 was obtained in the same manner as in Example 1 above.

Example 10 A deodorizing filter 1 was obtained in the same manner as in Example 1 except that the basis weight of the binder was 60 g / m ² . At this time, the amount of the normal temperature catalyst contained in the deodorizing filter 1 was 0.58% by mass with respect to the adsorbent 5.

Example 11 A deodorizing filter 1 was obtained in the same manner as in Example 1 except that the basis weight of the adsorbent 5 was 350 g / m ² . At this time, the amount of the normal temperature catalyst contained in the deodorizing filter 1 was 0.69% by mass with respect to the adsorbent 5.

Example 12 The basis weight of the adsorbent 5 and the binder was 150 g each.
A deodorizing filter 1 was obtained in the same manner as in Example 1 except that the deodorizing filters 1 / m ² and 50 g / m ² were used. At this time, the amount of the room temperature catalyst contained in the deodorizing filter 1 was 0.80% by mass with respect to the adsorbent 5.

Comparative Example 1 A deodorizing filter for comparison was obtained in the same manner as in Example 1 except that a hot melt powder containing no catalyst was used as a binder.

Comparative Example 2 A comparative deodorizing filter was obtained using activated carbon as an adsorbent 5 on which the same amount of ruthenium as in Example 1 was directly impregnated and supported.

The specifications of the deodorizing filters obtained in Examples 1 to 12 and Comparative Examples 1 and 2 are summarized in Table 1.

[0057]

[Table 1]

Performance Evaluation 1 The deodorizing filters obtained in Examples 1 to 12 and Comparative Examples 1 and 2 were subjected to the following deodorizing test.

<Deodorization Test Procedure> Each test filter (200 × 200 mm) was set in a 200 L acrylic chamber, and then 6 ppm of acetaldehyde equivalent to a representative component of tobacco odor was introduced into the chamber. The remaining concentration in the chamber after one hour has elapsed is measured by a gas monitor (IR type: manufactured by B & K),
This operation was repeated 10 times for a durability test, and the deodorizing life of each deodorizing filter was compared. Table 2 shows the results.

[0060]

[Table 2]

Performance Evaluation 2 Prior to the above deodorization test, the same deodorization test was performed using a test filter exposed to 100 ppm of ammonia for 1 hour, thereby investigating the influence of ammonia poisoning. Table 3 shows the results.

[0062]

[Table 3]

As is clear from the results in Tables 2 and 3, the deodorizing filters according to Examples 1 to 12 of the present invention are excellent in initial deodorizing performance and durability, and are not impaired by poisoning substances. It was confirmed that the composition exhibited excellent performance of being difficult.

On the other hand, in the filter of Comparative Example 1 containing no catalyst, although the initial deodorizing performance was excellent, the performance tended to decrease quickly, and the filter of Comparative Example 2 in which the catalyst was directly treated with the adsorbent was used. It was found that although the performance was relatively gentle, the initial performance was poor.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a three-layer structure of a deodorizing filter according to the present invention.

FIG. 2 is a perspective view showing a shape of a filter element using the deodorizing filter shown in FIG.

FIG. 3A is an enlarged cross-sectional view of a deodorizing filter according to the present invention in the vicinity of the surface of an adsorbent. (B) It is an expanded sectional view of the neighborhood of the adsorbent surface in the conventional deodorizing filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deodorizing filter 2 Nonwoven fabric for holding 3,4 Nonwoven fabric for dust removal 5 Adsorbent 5a Adsorption site 6 Catalyst 7 Binder 8 Nonwoven fabric fiber

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) // B01J 20/08 B01J 20/10 D 4G066 20/10 20/12 A 20/12 20/16 20 / 16 20/18 B 20/18 20/20 B 20/20 B01D 53/36 ZABH F term (reference) 4C080 AA07 BB02 CC01 HH05 KK08 LL02 LL10 MM02 MM07 NN22 QQ11 4D012 BA01 BA02 BA03 CA09 CB01 CD10 CG01 4 BA13 BB03 BB10 BC05 BC07 BC10 CA02 CB01 CB06 DA03 4D048 AA08 AA19 AA22 BA28Y BA30Y BA31X BA32X BA33Y BA34Y BA35Y BA37Y BA38Y BA41Y BA43X BA45X BA46X ABBB BB16 CC38 CC40 CC41 CD17 DA14 A17A14 A17A14A17A14A17A14A17A14A AB15H AB16A AB16B AB16C AB16H AB17A AB17B AB17C AB17H AB24A AB24B AB24C AB24H AB40A AB40B AB40C AB40H AC04A AC04H AC10A AC10H AD11A AD11H AS00A BA03 BA06 BA 10B BA10C BA13 CA30A CA30B CA30C DG15A DG15B DG15C GB90 JD14A JL08A JL08B JL08C 4G066 AA05B AA20B AA22B AA30B AA52D AA61B AA64B AA66B AB13D AC13C AC15C BA03 FA02 FA03 BA03 FA03

Claims (23)

[Claims] 1. A deodorizing filter having a three-layer structure of a nonwoven fabric for holding containing an adsorbent held by a binder and a nonwoven fabric for dust removal sandwiching the nonwoven fabric for holding from both sides, comprising: A deodorizing filter characterized in that a catalyst for treating a gas adsorbed on a material is present in a component other than the adsorbent among components forming the deodorizing filter. 2. The deodorizing filter according to claim 1, wherein the catalyst is contained in a binder. 3. The deodorizing filter according to claim 1, wherein the catalyst is contained in at least one of a holding nonwoven fabric and a dust removing nonwoven fabric. 4. The deodorizing filter according to claim 1, wherein the catalyst is present in a range of 2 mm from the center of the cross section of the deodorizing filter. 5. The catalyst according to claim 1, wherein the catalyst is ruthenium, platinum, palladium,
Iridium, manganese, copper, cobalt, nickel, gold,
The deodorizing filter according to any one of claims 1 to 4, wherein the filter is at least one selected from the group consisting of simple metals, oxides and chlorides of these metals. 6. The deodorizing filter according to claim 5, wherein the catalyst is at least one selected from ruthenium metal, ruthenium oxide and chloride. 7. The deodorizing filter according to claim 1, wherein 0.05 to 10% by mass of a catalyst is interposed in the binder with respect to the adsorbent. 8. The deodorizing filter according to claim 1, wherein 25 to 500 g of the adsorbent is supported per 1 m ^{2 of the} nonwoven fabric. 9. The deodorizing filter according to claim 1, wherein 50 to 300 g of the adsorbent is carried per 1 m ^{2 of the} nonwoven fabric. 10. The adsorbent has an average particle size of 0.05 to 1.7.
The deodorizing filter according to any one of claims 1 to 9, wherein 11. The adsorbent has an average particle size of 0.2 to 1.2 m.
The deodorizing filter according to any one of claims 1 to 9, wherein m is m. 12. The adsorbent is activated carbon, activated carbon fiber, zeolite, activated clay, sepiolite, ferriferrite,
The deodorizing filter according to any one of claims 1 to 11, wherein the filter is at least one selected from the group consisting of alumina, silica gel, and alumina-silica. 13. The deodorizing filter according to claim 12, wherein the adsorbent is activated carbon. 14. The deodorizing filter according to claim 1, wherein the adsorbent contains activated carbon that adsorbs a basic gas. 15. The deodorizing filter according to claim 1, wherein the catalyst is present on a surface of the binder. 16. The deodorizing filter according to claim 1, wherein the binder is at least one of a thermoplastic hot-melt type granular adhesive and a latex. 17. The deodorizing filter according to claim 16, wherein the binder is a thermoplastic hot-melt type granular adhesive. 18. The deodorizing filter according to claim 1, wherein the adsorbent is carried on the nonwoven fabric by a binder of 2 to 100% by mass based on the adsorbent. 19. The deodorizing filter according to claim 1, wherein the adsorbent is carried on the nonwoven fabric by a binder of 20 to 80% by mass based on the adsorbent. 20. A step of supporting a catalyst on a binder,
A step of spraying a mixture of the binder and the adsorbent supporting the catalyst obtained in the above step from above the holding nonwoven fabric while the holding nonwoven fabric is placed on the dust-removing nonwoven fabric; A method for producing a deodorizing filter, comprising a step of placing another nonwoven fabric for dust removal and heating and pressing to form a three-layer laminate. 21. A method for supporting a catalyst on a binder, which comprises immersing the binder in a solution containing a catalyst and / or a precursor of the catalyst, or spraying the solution on the binder, followed by drying. The method for producing a deodorizing filter according to claim 20, wherein 22. The deodorizing filter according to claim 21, wherein an aqueous solution of ruthenium chloride hydrate having a solid content of 1 to 10% by mass is used as the solution containing the catalyst and / or the precursor of the catalyst. Production method. 23. The method according to claim 20, wherein when the mixture of the binder carrying the catalyst and the adsorbent is sprayed on the nonwoven fabric for holding, the binder and the adsorbent are uniformly mixed and then sprinkled. 23. The method for producing a deodorizing filter according to any of 22.