JP2001070418A - Water resistant photocatalytic corrugated filter - Google Patents

Abstract

(57) [Summary] The present invention removes nitrate and sulfate ions remaining on a filter by washing with water, prevents a decrease in photocatalytic activation, and removes water from the filter itself after washing with water. Provide an unbreakable corrugated filter. Another object of the present invention is to provide a water-resistant photocatalytic corrugated filter having a low pressure loss. The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, at least a liner is composed of a water-resistant sheet or a water-repellent sheet in a corrugated filter comprising at least a photocatalyst-containing sheet. Water resistant photocatalytic corrugated filter. Furthermore,
It has been found that in a corrugated filter comprising at least a sheet containing a photocatalyst, the problem can be solved by a water-resistant photocatalytic corrugated filter characterized in that at least the corrugate is constituted by a water-resistant sheet or a water-repellent sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated filter comprising a sheet containing a photocatalyst used for applications such as an air purifier, an air conditioner, and a vacuum cleaner. And a water-washable corrugated filter.

[0002]

2. Description of the Related Art Conventionally, odors caused by industrial odors in factories and the like, and odors caused by wastes in service industries such as restaurants and hotels that discharge a large amount of waste have been problems. In addition, odors in daily living spaces such as in automobiles and in general rooms have also been highlighted. Therefore, there is an increasing need for the removal of harmful substances such as odors, and air purifiers and air conditioners incorporating a odor removal device, a odor removal filter, and the like are being actively developed.

[0003] In general air purifiers and air conditioners, a filter containing activated carbon is used, and a method of adsorbing harmful substances such as odors to the activated carbon is employed. However, activated carbon only exhibits an adsorption effect on most harmful substances, and when a certain amount of harmful substances is adsorbed, the filter must be replaced. Alternatively, there is a problem that the harmful substance once adsorbed is easily released due to a rise in ambient temperature or a decrease in the concentration of the harmful substance.

In recent years, in order to solve such a problem,
Materials using a catalyst capable of decomposing harmful substances, or materials combining a photocatalyst and an adsorbent such as activated carbon have been developed. For example, Japanese Patent Application Laid-Open No. 1-234729 discloses an air purifier incorporating a deodorant obtained by forming a layer of titanium dioxide having photocatalytic ability on the surface of honeycomb activated carbon. The air purifier is equipped with an ultraviolet lamp, and irradiates the deodorant with ultraviolet light to decompose and remove harmful substances adsorbed on activated carbon by the photocatalytic action of titanium dioxide.

Japanese Unexamined Patent Publication (Kokai) No. 4-256755 discloses a material capable of decomposing and removing various harmful substances such as a photocatalyst removing material made of granular pulp carrying a photocatalyst such as titanium dioxide.

At present, deodorizing filters using a photocatalyst are installed in air purifiers, air conditioners, vacuum cleaners and the like. Most of them aim to increase the surface area as a means for increasing the chance of contact between harmful substances and titanium oxide and increasing the amount of ultraviolet light received. At present, a filter processed into a corrugated filter or the like is used as the method.

In a photocatalytic corrugated filter using a photocatalyst, organic compounds composed of hydrocarbons and the like are decomposed into water and carbon dioxide. However, nitrogen-containing compounds such as NOx and SOx and sulfur-containing compounds are generated at home. Even if nitrogen-containing organic compounds such as ammonia and amines and sulfur-containing organic compounds such as methyl mercaptan are decomposed by photocatalysis, they become nitrate ions or sulfate ions as final products and remain on the filter. And there is a problem that the photocatalytic deodorizing performance is reduced.

Further, most of the photocatalytic corrugated filters currently on the market are those based on nonwoven fabrics and those based on inorganic fibers.
There is a problem in that the pressure loss increases due to fibrous fluff on the cross section or fibrous fluff inside the pitch.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and removes nitrate ions and sulfate ions remaining on a filter by washing with water to prevent a decrease in photocatalytic activation. Provide a corrugated filter that does not break itself when draining the filter. Further, to provide a water-resistant photocatalytic corrugated filter with low pressure loss.

[0010]

Means for Solving the Problems As a result of intensive studies conducted by the present inventor to solve the above-mentioned problems, at least the liner of a corrugated filter comprising a sheet containing a photocatalyst is constituted by a water-resistant sheet. A water-resistant photocatalytic corrugated filter, a corrugated filter comprising the sheet, wherein at least the liner is composed of a water-repellent sheet; and a corrugated filter comprising the sheet, wherein at least the corrugate is a water-resistant sheet. A water-resistant photocatalytic corrugated filter, comprising: a corrugated filter comprising a water-repellent sheet, wherein the corrugated filter comprises a water-repellent sheet. It has been found that can be solved by.

Hereinafter, the present invention will be described in detail.

In the present invention, a corrugated filter refers to a filter composed of a corrugated portion (wave portion) and a liner (linear portion) as shown in FIGS.
The upper and lower outer frames of the corrugated filter shown in FIG. Conversely, when corrugates are normally stacked, there is no side outer frame, and it is necessary to provide an arbitrary outer frame.

As a result of intensive studies, a corrugated filter comprising a sheet containing at least a photocatalyst has
The water-resistant photocatalytic corrugated filter, characterized in that at least the liner is composed of a water-resistant sheet, has a corrugated shape that does not collapse even if the water that accumulates in the pitch is drained after prolonged immersion in washing water containing water or detergent. It turned out to be a filter.

Normally, when the photocatalytic corrugated filter has a certain thickness, its outer dimensions are small, and the pitch shown in 3 in FIG. 1 is fine, the strength as a structure increases, and the photocatalytic corrugated filter accumulates in a little water immersion or pitch. The corrugate itself does not collapse at the water drain.

However, since the corrugated filter made of a sheet containing a photocatalyst is actually used for an air purifier, an air conditioner, or the like, the thickness and the pitch size are limited due to space problems and pressure loss on the device. Thinner, pitch sizes tend to be larger. With such specifications, the strength becomes insufficient when the corrugated filter is viewed as a structure. There is no problem if such a filter is left standing and immersed in water, for example, by washing it with water, but if it is lifted to drain the filter and dried, it contains water taken in between pitches and contains photocatalyst Sheet cannot withstand the weight of the absorbed water,
There was a problem that the filter was broken.

In the present invention, by forming a part of the portion shown in FIG. 1 of the photocatalytic corrugated filter as a water-resistant sheet, the strength of the corrugated filter as a structure is increased, and the water accumulated in the pitch can be cut off. It turned out that the filter did not break.

In the present invention, a water-resistant sheet refers to a sheet having a tensile strength of 90% or more after immersion in water for 24 hours before immersion.

In the present invention, as a result of further study, it has been found that a water-resistant photocatalytic corrugated filter in which at least a liner is formed of a water-repellent sheet in a corrugated filter comprising at least a sheet containing a photocatalyst does not accumulate water in pitch. I understood that.
Therefore, it was found that the drainage was easy and the filter did not break when the water was drained.

In the present invention, when a water-resistant or water-repellent sheet is used, in most cases, a resin sheet or a metal sheet is used in many cases, and there is no fluff as compared with a nonwoven sheet used for a general photocatalytic corrugate. It was found that the pressure loss was reduced because the gas passed smoothly.

In the present invention, by forming a part of the photocatalytic corrugated filter shown in FIG. 1 as a water-resistant sheet, the strength of the corrugated filter as a structure is further increased as compared with the case where the water-resistant sheet is used as the liner. It turned out that the filter did not break when cutting off the water that had accumulated on the pitch.

According to the present invention, as a result of further study, the corrugated filter comprising at least a photocatalyst-containing sheet, wherein at least the corrugate is formed of a water-repellent sheet, the water-resistant photocatalytic corrugated filter further comprises water at a pitch. It did not accumulate, drained easily, and found that the filter did not break when draining.

In the present invention, at least when a water-resistant or water-repellent sheet is used for the corrugate, the sheet is mostly made of resin or metal, and has no fluff as compared with a nonwoven sheet used for a general photocatalytic corrugate. ,
Further, it has been found that the pressure drop is further reduced because the gas passes more smoothly than when the liner is changed because the curved portion is smoothed.

In the present invention, it has been found that the water-resistant photocatalytic corrugated filter is basically a deodorizing filter, and that not only the photocatalyst but also the adsorbent can significantly improve the odor removing performance. Furthermore, it has been found that a sheet that does not damage the substrate supporting the photocatalyst can be obtained by using the composite aggregate of the photocatalyst and the adsorbent.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

In the present invention, when obtaining a water-resistant photocatalytic corrugated filter composed of a water-resistant sheet at least as a liner, it is preferable to arbitrarily adjust the number of stages in which the sheet is placed. That is, when the maximum amount is inserted, the entire liner can be replaced by the sheet. However, in such a case, at least the ratio of the sheet containing the photocatalyst to the corrugated filter decreases, which is not preferable as a deodorizing filter. Therefore, it is preferable to use the sheet as the liner to the extent that the strength of the corrugated filter as a structure can be maintained. Conversely, when the entire liner is replaced with the sheet, the strength of the corrugated filter as a structure increases, and the pressure loss decreases.

Therefore, in the case of a photocatalytic corrugated filter having a large pitch and a small thickness, the number of liners provided on the sheet is increased. It is preferred that

In the present invention, various water-resistant sheets used for the water-resistant photocatalytic corrugated filter, wherein at least the liner is composed of a water-resistant sheet, can be used. Since it is basically a liner, that is, a straight portion, there is no need to bend and process it like a corrugated portion, so that it can be used to some extent thick.

Accordingly, a sheet that can be preferably used includes a resin sheet, a metal sheet, and a ceramic sheet. Specifically, examples of the resin sheet include a polypropylene sheet, a polyethylene terephthalate sheet, a polyethylene sheet, and an acrylic sheet, and the thickness that can be preferably used is 50 μm or more. In the case of a metal sheet, preferably usable ones are aluminum, stainless steel, copper, magnesium, titanium and the like. Even in this case, even if the thickness of the corrugated filter is small, a certain thickness or more is necessary to maintain the strength of the corrugated structure, and a thickness of 30 μm or more is preferably used.

In the present invention, various ceramic sheets can be preferably used. In particular, since a sheet or the like in which ceramic is formed absorbs water even in the sheet itself, it is preferable that the strength of the ceramic sheet is not reduced by water.

In the present invention, a corrugated filter comprising at least a photocatalyst-containing sheet, wherein at least the liner is composed of a water-repellent sheet, the water-resistant photocatalyst corrugate filter may be formed by optionally arranging the sheet similarly to the water-resistant sheet. It is preferable to adjust the number of stages to be inserted. Since the corrugated filter using the water-repellent sheet does not form a water film on the pitch, it is not necessary to drain the water.

In the present invention, the water-repellent sheet preferably used is a fluorine-based resin sheet, a silicon-based resin sheet, a normal polypropylene sheet, a polyethylene terephthalate sheet, a polyethylene sheet, an acrylic sheet, and the above-mentioned fluorine-based or silicon-based sheet. Examples thereof include those obtained by laminating resin sheets and those subjected to a water-repellent surface treatment. Further, a sheet made of a metal sheet made of aluminum, stainless steel, copper, magnesium, or titanium and bonded with a fluorine-based or silicon-based resin sheet, or a sheet whose surface has been subjected to a water-repellent treatment can be preferably used.

In the present invention, at least the water-resistant or water-repellent sheet used for at least the liner is made of resin or metal, so that the surface is smooth and gas passes through the pitch smoothly, and the pressure loss is reduced. It has been found.

In the present invention, in the case of obtaining a water-resistant photocatalytic corrugated filter wherein at least the corrugate is formed of a water-resistant sheet, the liner is at least a water-resistant sheet. Unlike the case, since it is necessary to work into a curve, a degree of workability, that is, flexibility of the sheet is required.

That is, the water-resistant sheet is also preferably a resin sheet or a metal sheet. However, since flexibility is required, the sheet cannot be processed if the sheet is too thick. The sheet is about 1mm
Is preferred. Materials that can be preferably used as a material include resin sheets made of polypropylene, polyethylene terephthalate, polyethylene, acrylic, and the like, and metal sheets made of aluminum, stainless steel, copper, magnesium, titanium, and the like. Can be

According to the present invention, there is provided a corrugated filter comprising at least a photocatalyst-containing sheet, wherein at least the corrugate comprises a water-repellent sheet. Is preferably adjusted. In the corrugated filter using this water-repellent sheet, the ratio of the length occupying the outer periphery of the pitch is larger than that in the case where the liner is a water-repellent sheet. Because there is no, draining becomes easier.

In the present invention, the water-repellent sheet preferably used is almost the same as the water-repellent sheet preferably used for the liner except for the preferable thickness.

In the present invention, at least the water-resistant or water-repellent sheet used for at least the corrugate is made of resin or metal, so that the surface is smooth and the gas passes through the pitch smoothly and the pressure loss is reduced. It has been found. Further, since the ratio of the pitch to the outer periphery of the pitch is long, the pressure loss is further reduced as compared with the case where the liner is a water-resistant or water-repellent sheet.

In the present invention, the photocatalyst used in the water-resistant photocatalytic corrugated filter is a semiconductor which generates a photocatalytic reaction having a band gap of 0.5 to 5 eV, preferably 1 to 3 eV, and OH radical generated by photoexcitation. Decomposes harmful substances. The shape of the photocatalyst is preferably in the form of particles, and the specific surface area is 10 to 500 m ² / g.
Are appropriately selected and used.

[0039] Such a photocatalyst is disclosed in
No. 73514 can be cited, and metal oxides such as zinc oxide, tungsten trioxide, titanium oxide, and cerium oxide are preferable. Among these, titanium oxide has structural stability and photocatalyst. It is a particularly preferable material in consideration of its ability as a material, safety in handling, and the like. As titanium oxide, in addition to titanium dioxide, hydrous titanium oxide, hydrated titanium oxide, metatitanic acid, orthotitanic acid, titanium hydroxide and the like can be used, and the crystal form is not particularly limited.
When using titanium oxide, its specific surface area is 50 to 4
A thing of 00 m ² / g is preferred. Further, the surface of titanium oxide may be coated with a metal such as platinum, gold, silver, palladium, rhodium and ruthenium, or a metal oxide such as ruthenium oxide and nickel oxide.

In the present invention, the first function of the water-resistant photocatalytic corrugated filter is the deodorizing performance, and the photocatalyst alone is not sufficient. Therefore, it is preferable to use the photocatalyst and the deodorizing agent together. Examples of the deodorizer include activated carbon, impregnated activated carbon, coconut shell activated carbon, zeolite, high silica zeolite, and the like, manganese dioxide, catalytic metal oxides such as iron dioxide, platinum, platinum, and noble metal catalytic deodorants such as platinum. And the like. Above all, a physical adsorption type deodorant is preferably used. The shape of these deodorants is not particularly limited, but in consideration of the photocatalyst, particularly when used in combination with anatase-type powdered titanium dioxide, particles are preferable, and the specific surface area is 50 to 200.
It is preferable to select and use one having 0 m ² / g as appropriate. For example, in the case of activated carbon, 500 to 1500 m ² /
g are preferred.

Further, in the present invention, when a photocatalyst and a deodorant are used in combination, it is preferable to adopt a method of forming an aggregated composite of the two and making it difficult for the photocatalyst to attack the base material. Since the photocatalyst does not directly contact the base material supported by the aggregated composite, a sheet containing the photocatalyst can be easily obtained. Therefore, as a method for obtaining a sheet containing a photocatalyst, an internal addition type in which a sheet containing a photocatalyst is sieved together with synthetic fibers or pulp, and a sheet containing a photocatalyst by sandwiching the aggregated composite in a nonwoven fabric The type is preferably used. The methods are listed below.

First, a photocatalyst, a deodorant and, if necessary, a carrier are added and mixed in water. When using fine fibers, they are also added to water at this stage. Then, using a suitable flocculant, form an aggregated composite of the photocatalyst and the deodorant (carrier and fine fibers), or dry it in a granular form, or mix it with a suitable binder and bond it during coating / drying. Adjust to have strength.

As the coagulant, a cationic polymer coagulant, for example, cationic polyacrylamide, polyaluminum chloride and the like can be used. Preferably, inorganic polyaluminum chloride or the like is used. The amount of the coagulant to be added depends on the type and amount of the photocatalyst, carrier, deodorant, and fine fibers used.

Further, an anionic polymer coagulant which forms a complex with these cationic polymer coagulants to enhance coagulation, such as anionic polyacrylamide, or an anionic inorganic fine particle such as colloidal silica And an aqueous dispersion of bentonite can also be used in combination.

In the case of the internal addition type, a sheet containing a deodorizer containing at least a photocatalyst can be obtained by a method of producing a wet nonwoven fabric by mixing the above-mentioned aqueous dispersion of the aggregated composite with synthetic fibers or pulp. .

The synthetic fibers preferably used in the present invention include polyamide fibers, polyester fibers, polyalkylene paraoxybenzoate fibers, polyurethane fibers,
Synthetic fibers such as polyvinyl alcohol fiber, polyvinylidene chloride fiber, polyvinyl chloride fiber, polyacrylonitrile fiber, polyolefin fiber and phenol fiber, inorganic fibers such as glass fiber, metal fiber, alumina fiber and activated carbon fiber Natural fibers such as wood pulp, hemp pulp, and cotton linter pulp, regenerated fibers, and fibers obtained by imparting functions such as hydrophilicity and flame retardancy to these fibers are preferably used.

Next, a method for obtaining a sheet containing a photocatalyst of the enclosing type will be briefly described.

In the present invention, as the base material of the sheet containing the encapsulation type photocatalyst, any material can be used as long as it can hold the aggregated composite. Preferably, the substrate is preferably not decomposed by a photocatalytic reaction,
It is necessary to select the photocatalytic corrugated filter in consideration of workability, and a nonwoven fabric is one of the preferable substrates. In the present invention, the sheet containing the photocatalyst of the encapsulation type has air permeability for passing odorous substances and ultraviolet transmittance for activating the photocatalyst. As a form of such a base material,
Non-woven fabric or porous film and the like,
A nonwoven fabric is a particularly preferred base material because it is easy to control the basis weight and air permeability and is excellent in workability.

Nonwoven fabrics which can be preferably used in the present invention include polyamide fibers, polyester fibers, polyalkylene paraoxybenzoate fibers, polyurethane fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, and polyacrylonitrile. -Based fibers, polyolefin-based fibers, synthetic fibers such as phenol-based fibers, glass fibers, metal fibers, alumina fibers,
Inorganic fiber such as activated carbon fiber, wood pulp, hemp pulp,
It is produced by various methods using natural fibers such as cotton linter pulp, regenerated fibers, or fibers obtained by imparting functions such as hydrophilicity and flame retardancy to these fibers.

The method for producing the nonwoven fabric is not particularly limited, and the web obtained by a dry method, a wet papermaking method, a melt blown method, a spun bond method, or the like may be subjected to a water jet method, a needle punch method, or a stitch method, depending on the purpose and application. It can be produced by appropriately combining a physical method such as a bonding method, a bonding method using heat such as a thermal bonding method, and a method using a binder such as a resin bond to develop strength.

In the present invention, as a method for producing a sheet containing a photocatalyst of the encapsulation type, at least two or more substrates are used, and after the composite aggregate is interposed in one of the substrates, a heating roll is used. There is a method of bonding using a whole surface, a method of partially bonding using an embossing roll, a method of treating in a high-temperature atmosphere, a method of bonding by ultrasonic melting, laser melting, high-frequency melting, and the like.
Alternatively, a sheet containing a photocatalyst can be produced in combination.

The sheet containing at least the photocatalyst is water-resistant and absorbs water, but does not collapse like paper.

[0053]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

(1) Preparation of Aggregated Composite Titanium dioxide powder (produced by Nippon Aerosil Co., Ltd.)
100 parts by weight of P25S6), 50 parts by weight of high silica zeolite (HSZ-690HOA, manufactured by Tosoh Corporation) and 50 parts by weight of composite ferrosilicate powder (Mizukanite AP, manufactured by Mizusawa Chemical Industry Co., Ltd.) were added and mixed in water. Polyaluminum chloride (Mizusawa Chemical Industries, PA
C) was added in an amount of 5 parts by weight to form an aggregate of titanium dioxide, high silica zeolite, and a composite ferrosilicate.
The aggregate was filtered, dried, and pulverized to prepare an aggregate.

(2) Preparation of Sheet A Containing Internal Addition Type Photocatalyst Core-sheath type heat-fusible polyester fiber (# 4 manufactured by Unitika Ltd.)
080, fineness 2 denier, fiber length 5 mm) 55% by weight,
40% by weight of polyester fiber (manufactured by Teijin, Tepyrus, 0.5 denier fineness, fiber length 5mm) and 5% by weight of softwood bleached kraft pulp (Canada standard freeness 480mL) are added and mixed in water to prepare an aqueous dispersion. did. Next, the aqueous dispersion of the aggregated composite described in (1) was added to and mixed with the aqueous dispersion in an amount corresponding to 50% by weight based on the fiber content to prepare an aqueous slurry. From the aqueous slurry, a sheet A containing a photocatalyst of an internal addition type having a basis weight of 100 g / m ² was prepared using a circular paper machine.

(3) Preparation of Sheet B Containing Encapsulated Type Photocatalyst 70% by weight of polyester fiber (Visilon, fineness 0.15 denier, fiber length 7.5 mm, manufactured by Asahi Kasei Corporation), polyester fiber (manufactured by Teijin Limited) An aqueous slurry was prepared by adding and mixing 30% by weight of tetron, fineness 1.5 denier, fiber length 20 mm) in water, and a web having a basis weight of 60 g / m ² was formed from the aqueous slurry using a circular paper machine. . Next, the web was loaded on a porous support made of a 100-mesh stainless steel wire, and a high-pressure columnar water flow of 100 kg / cm ² was jetted to entangle the fibers, and dried with an air dryer to obtain an encapsulation type nonwoven fabric. . Next, on the non-woven fabric, the agglomerated composite described in the above (1) and granules of vinyl acetate resin as a binder are mixed and loaded at 5% by weight based on the agglomerated composite. Furthermore, after further laminating the above-mentioned nonwoven fabric on the agglomerated composite volume loading base material,
The sheet was pressurized with an embossing roll heated to ° C., and a sheet B containing an encapsulated photocatalyst having an aggregated composite content of 100 g / m ² was prepared.

Example 1 The sheet A described in the above (2) was applied to a liner and a corrugate.
Using a sheet made of polyethylene terephthalate having a thickness of 100 μm as a liner, a size of 300 (length) × 280
A photocatalytic corrugated filter (width) x 5 (width) mm, pitch size 5.1 mm, and height 2.7 mm was produced. At this time, since corrugates are piled up in the horizontal direction, the height of one pitch is 2.7 mm, so that about 102 steps of liners are formed. Half of this liner was replaced with a 100 μm-thick polyethylene terephthalate sheet. Also, the replacement order was changed to one step, and a water-resistant photocatalytic corrugated filter was obtained. This was designated as Example 1.

Example 2 The sheet A described in the above (2) was applied to a liner and a corrugate.
Using a 70μm thick aluminum sheet for the liner part,
A photocatalytic corrugated filter having a size of 300 (length) x 280 (width) x 5 (width) mm, a pitch size of 5.1 mm, and a height of 2.7 mm was produced. At this time, since corrugates are piled up in the horizontal direction, the height of one pitch is 2.7 mm, so that a liner of about 102 steps is formed.
The sheet was replaced with a thick polyethylene terephthalate sheet. Also, the replacement order was changed to one step, and a water-resistant photocatalytic corrugated filter was obtained. This was designated as Example 2.

Example 3 The sheet A described in the above (2) was applied to a liner and a corrugate.
Using a 100 μm thick Teflon sheet for the liner, size 300 (length) x 280 (width) x 5 (width) m
m, a photocatalytic corrugated filter with a pitch size of 5.1 mm and a height of 2.7 mm. At this time, since corrugates are piled up in the horizontal direction, the height of one pitch is 2.7 mm, so that a liner of about 102 steps is formed.
The sheet was replaced with a polyethylene terephthalate sheet having a thickness of 0 μm. Also, the replacement order was changed to one step, and a water-resistant photocatalytic corrugated filter was obtained. This was designated as Example 3.

Example 4 The sheet A described in the above (2) was applied to a liner and a corrugate.
Using a 100μm thick aluminum sheet for the liner,
A photocatalytic corrugated filter having a size of 300 (length) × 280 (width) × 5 (width) mm, a pitch size of 6.1 mm, and a height of 3.8 mm was produced. At this time, the height of one pitch is 6.
The liner of about 72 steps is formed because of 1 mm, and half of the liner was replaced with an aluminum sheet having a thickness of 100 μm. Also,
The replacement order was changed to one step, and a water-resistant photocatalytic corrugate was obtained. This was designated as Example 4.

Example 5 The sheet B described in the above (3) was applied to a liner and a corrugate.
Using a 70 μm-thick aluminum sheet as a liner, a photocatalytic corrugated filter having a size of 300 (length) × 280 (width) × 5 (width) mm, a pitch size of 5.1 mm, and a height of 2.7 mm was produced. At this time, since corrugates are piled up in the lateral direction, the height of one pitch is 2.7 mm, so that
A half liner was formed, and half of the liner was replaced with a polyethylene terephthalate sheet having a thickness of 100 μm.
Also, the replacement order was changed to one step, and a water-resistant photocatalytic corrugated filter was obtained. This was designated as Example 5.

Example 6 The sheet A described in the above (2) was applied to a liner and a corrugate.
Using a 70μm thick aluminum sheet for the corrugate,
A photocatalytic corrugated filter having a size of 300 (length) x 280 (width) x 5 (width) mm, a pitch size of 5.1 mm, and a height of 2.7 mm was produced. At this time, the height of one pitch is 6.
About 1/3 of the corrugate is formed because of the 1 mm, but about one third of the corrugate was replaced with an aluminum sheet having a thickness of 70 μm. Also, the replacement order was changed to two steps, and a water-resistant photocatalytic corrugated filter was obtained. This was designated as Example 6.

Example 7 The sheet A described in the above (2) was applied to a liner and a corrugate.
Using a Teflon sheet of 100 μm thickness for corrugation, size 300 (length) x 280 (width) x 5 (width) m
m, a photocatalytic corrugated filter with a pitch size of 5.1 mm and a height of 2.7 mm. At this time, since corrugates are stacked in the horizontal direction, the height of one pitch is 2.7 mm, so that about 102 corrugations can be formed. However, about one third of this corrugate is formed into a 100 μm thick Teflon sheet. Replaced. Also, the replacement order was changed to two steps, and a water-resistant photocatalytic corrugated filter was obtained. This was designated as Example 7.

Comparative Example 1 The sheet A described in the above (2) was used, and the size was 300
A photocatalytic corrugated filter having (vertical) × 280 (horizontal) × 5 (width) mm, a pitch size of 5.1 mm and a height of 2.7 mm was produced, and a photocatalytic corrugated filter was obtained.

Comparative Example 2 Using the sheet B described in (3) above,
A photocatalytic corrugated filter having (vertical) × 280 (horizontal) × 5 (width) mm, a pitch size of 5.1 mm and a height of 2.7 mm was produced, and a photocatalytic corrugated filter was obtained.

Comparative Example 3 Using the sheet A described in the above (2), a size of 300
A photocatalytic corrugated filter having (vertical) × 280 (horizontal) × 5 (width) mm, a pitch size of 6.1 mm and a height of 3.8 mm was produced, and a photocatalytic corrugated filter was obtained.

<Evaluation of Water Resistance of Photocatalytic Corrugated Filter> The water-resistant photocatalytic corrugated filter and the photocatalytic corrugated filter prepared in Examples 1 to 7 and Comparative Examples 1 to 3 were replaced with a fresh wind generator (Photocatalyst manufactured by Mitsubishi Paper Mills, Ltd.). The photocatalyst filter of the system air purifier was removed, and the dust filter and the photocatalytic corrugated filter were installed in the prefilter installation portion. The photocatalyst corrugated filter sizes produced in the examples and comparative examples fit perfectly in the housing frame of the new and fresh air blower. In addition, since the current new and fresh air blowers have a distance from the UV lamp installation section to the pre-filter section,
Two ultraviolet lamps were installed downwind of the photocatalytic corrugated filter.

Next, the deodorizing performance was evaluated in accordance with the deodorizing performance test of a household air purifier according to JEOL industry standard JEM1467. At this time, a new and fresh air blower was operated by turning on a newly installed ultraviolet lamp, and a practical deodorizing test of 5 cigarettes × 5 tobacco deodorizing tests was performed.

Thereafter, the photocatalytic corrugated filter was immersed and washed in a 10% aqueous solution of a detergent "Attack" (manufactured by Kao) for 3 days. Remove the filter from the wash water, rinse the detergent thoroughly with water, observe the water film on the pitch of the filter, hold the end of the filter, shake and drain the water,
Allow to air dry. The state after draining was carefully observed, and the water resistance was evaluated. Table 1 shows the results.

Next, this filter was irradiated with a 20 W ultraviolet lamp for 12 hours to completely regenerate the filter.

Further, the electric industry standard JEM1
The deodorizing performance was evaluated according to the deodorizing performance test of the household air purifier of No. 467. At this time, a new and fresh air blower was operated by turning on a newly installed ultraviolet lamp, and a practical deodorizing test of 5 cigarettes × 5 tobacco deodorizing tests was performed. The recovery rate of the filter was determined together with the results of the deodorization performance test performed earlier, and the results are shown in Table 2.

[0072]

[Table 1]

[0073]

[Table 2]

<Evaluation of Pressure Loss of Photocatalytic Corrugated Filter> The pressure loss at each wind speed of the water-resistant photocatalytic corrugated filters and photocatalytic corrugated filters produced in Examples 1 to 7 and Comparative Examples 1 to 3 was measured. Table 3 shows the results
Shown in The unit of pressure loss is mmH ₂ O.

[0075]

[Table 3]

[0076]

According to the results of Tables 1 to 3 above, water resistance is obtained.
It was found that a water-resistant photocatalytic corrugated filter capable of maintaining the shape of the filter even when draining during washing was obtained. Furthermore, it was found that a water-resistant photocatalytic corrugated filter having a low pressure loss was obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a general corrugated filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugate (wave part) 2 Liner (linear part) 3 Pitch 4 Upper and lower outer frame 5 Side outer frame

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01J 35/02 ZAB B01D 53/36 J F-term (Reference) 4C080 AA07 AA10 BB02 CC01 HH05 JJ03 KK08 LL10 MM02 4D012 BA01 BA02 BA03 CA09 CB02 CD08 CD10 CG01 CH05 4D048 AA22 AB01 AB03 BA07X BA13X BA16X BA19X BA27X BA30X BA31X BA32X BA33X BA34X BA41X BB02 BD06 CA02 CC40 CD01 CD05 BC01B04BBABCBBC BCBC BCBC CA07 CA10 CA17 DA06 EA21 FB23 FB27 FB68 FB71

Claims (6)

[Claims] 1. A corrugated filter comprising at least a photocatalyst-containing sheet, wherein at least the liner is composed of a water-resistant sheet. 2. A corrugated filter comprising at least a photocatalyst-containing sheet, wherein at least the liner comprises a water-repellent sheet. 3. A corrugated filter comprising at least a photocatalyst-containing sheet, wherein at least the corrugate comprises a water-resistant sheet. 4. A corrugated filter comprising at least a photocatalyst-containing sheet, wherein at least the corrugate comprises a water-repellent sheet. 5. The water-resistant photocatalyst corrugated filter according to claim 1, wherein the sheet containing at least a photocatalyst is a sheet containing at least a photocatalyst and an adsorbent. 6. The water-resistant photocatalytic corrugated filter according to claim 1, wherein at least the sheet containing a photocatalyst is a sheet containing a composite aggregate of a photocatalyst and an adsorbent.