JP2001025668A - Photocatalytic corrugated filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photocatalytic corrugated filter whose corrugated shape can be maintained even being exposed to ultraviolet rays of a high intensity, whose catalytically functioning surface area is increased, and whose catalytic activity deterioration by nitrate ion and sulfate ion remaining thereon is prevented. SOLUTION: A photocatalytic corrugated filter comprises a sheet containing at least a photocatalyst and an inorganic adhesive as an adhesive for forming the corrugated structure. A photocatalytic corrugated filter comprises the sheet and an ultraviolet ray transmissive inorganic porous adhesive as an adhesive for forming the corrugated structure and the thickness of the adhesive in the adhesion part is proper to transmit ultraviolet rays. Further a water-resistant photocatalytic corrugated filter comprises the sheet and a mixture of alumina sol and poly(vinyl alcohol) as an adhesive for forming the corrugated structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention A photocatalytic corrugated filter comprising a sheet containing at least a photocatalyst and an inorganic adhesive used as a corrugating adhesive.

[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.

However, since the corrugated filter contains a photocatalyst having a strong oxidizing action, there is a problem that the corrugating adhesive or the like is decomposed by the photocatalyst when exposed to high-intensity ultraviolet rays. In particular, in order to further activate the photocatalyst, a UV lamp that generates high-intensity ultraviolet light may be used.

Further, contrary to the above problem, in a photocatalytic corrugate used at a normal ultraviolet intensity, the odor is decomposed because the ultraviolet ray does not reach the adhesive portion between the corrugate (wave portion) and the liner (linear portion). There was a problem that the function was not fulfilled and the adhesive part was not utilized.

A photocatalytic corrugate using a photocatalyst decomposes organic compounds composed of hydrocarbons into water and carbon dioxide, but contains nitrogen-containing compounds such as NOx and SOx, sulfur-containing compounds, and odors generated at home. Substances such as nitrogen-containing organic compounds such as ammonia and amines and sulfur-containing organic compounds such as methyl mercaptan can be decomposed by photocatalysis, but become nitrate ions or sulfate ions as final products and remain on the filter. It is known, and there is a problem that the photocatalytic deodorizing performance is reduced.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the shape of the photocatalytic corrugate is maintained even when exposed to high-intensity ultraviolet rays. When used, it is an object of the present invention to provide a photocatalytic corrugated filter which increases the area on which the photocatalyst acts, and further prevents photocatalytic activation from being reduced by nitrate ions or sulfate ions remaining on the filter by washing with water.

[0011]

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that an inorganic adhesive is used as a corrugating adhesive using at least a sheet containing a photocatalyst. A photocatalytic corrugated filter characterized by using the sheet, an ultraviolet-permeable inorganic porous adhesive as an adhesive for corrugating constitution, and the thickness of the adhesive at the bonding portion is capable of transmitting ultraviolet light. It has been found that the problem can be solved by a water-resistant photocatalytic corrugate filter characterized by using a photocatalytic corrugate filter and a mixture of alumina sol and polyvinyl alcohol as an adhesive for forming a corrugate.

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). At this time, a corrugated filter is formed by bonding the vertex portion of the corrugated wave and the liner (linear portion) with an adhesive. In the present invention, the adhesive refers to the adhesive used for this bonding.

As a result of intensive studies, a photocatalytic corrugated filter characterized in that an inorganic adhesive is used as a corrugating adhesive using a sheet containing at least a photocatalyst, even when exposed to high-intensity ultraviolet light for a long time. It was found that the corrugated shape could be maintained.

Normally, an organic adhesive is used for the photocatalytic corrugated filter, and the adhesive is not decomposed by the photocatalyst under ultraviolet light having a normal intensity of about 0.1 to 4 mW / cm ² . When exposed to high intensity ultraviolet rays, there is a problem that the adhesive decomposes and the shape of the corrugate cannot be maintained.

Since the photocatalytic corrugated filter in the present invention uses an inorganic adhesive, it does not decompose even when exposed to high-intensity ultraviolet rays.

In the present invention, high-intensity ultraviolet light is 4 m
This is a case where the intensity of W / cm ² or more is applied to the filter. Even if the ultraviolet lamp has an intensity of 10 mW / cm ² , the distance from the filter is large and the ultraviolet intensity reaching the actual filter is 4 mW. / Cm ² or less is not referred to as high intensity ultraviolet light.

In the present invention, an ultraviolet-permeable inorganic porous adhesive is used as a corrugating adhesive using a sheet containing at least a photocatalyst, and the thickness of the adhesive at the bonding portion is ultraviolet-permeable. By using the photocatalyst corrugated filter characterized by the above feature, the area where the photocatalyst acts can be increased even at ordinary ultraviolet intensity.

If the thickness of the organic adhesive, which is a normal adhesive, is transparent to ultraviolet light, the photocatalyst works even with normal ultraviolet intensity, and the adhesive is immediately deteriorated and the corrugated filter cannot be maintained.

Further, when an inorganic adhesive such as clay having a low ultraviolet transmittance is used with a certain thickness of the adhesive, there is a problem that the ultraviolet light does not pass and the photocatalyst does not work. When an inorganic porous adhesive such as alumina sol having ultraviolet transmittance is used, a photocatalyst also works on the bonded portion.

A water-resistant photocatalytic corrugate filter characterized by using a sheet containing at least a photocatalyst and using a mixture of alumina sol and polyvinyl alcohol as an adhesive for corrugating can provide a filter capable of maintaining the corrugate even after washing with water. It became.

Further, the present invention can be washed with water,
Nitrate ions and sulfate ions remaining on the filter can be washed away, and a water-resistant photocatalytic corrugated filter capable of preventing a decrease in photocatalytic activation has become possible.

In the present invention, by adding a crosslinking agent to a mixture of alumina sol and polyvinyl alcohol,
Furthermore, a photocatalytic corrugated filter with high water resistance has become possible.

In the present invention, a mixture of alumina sol and polyvinyl alcohol is used as an adhesive, and when the thickness of the adhesive is permeable to ultraviolet light, the shape of the corrugate can be maintained even when exposed to high intensity ultraviolet light. It has been found that the photocatalyst sheet can be used effectively and that a water-resistant photocatalyst corrugated filter can be formed. In addition, alumina sol and the like are used in ink jet image receiving bodies and are porous materials having excellent adsorptivity to liquids such as inks and gases such as gases. The location turned out to be very effective.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a photocatalytic corrugated filter characterized in that at least a photocatalyst-containing sheet is used and an inorganic adhesive is used as a corrugating adhesive.

An ultraviolet-permeable inorganic porous adhesive is used as a corrugating adhesive using a sheet containing at least a photocatalyst, and the thickness of the adhesive at the bonding portion is capable of transmitting ultraviolet light. To provide a photocatalytic corrugated filter.

Further, the present invention provides a water-resistant photocatalytic corrugated filter, characterized in that a mixture of alumina sol and polyvinyl alcohol is used as an adhesive for corrugating using a sheet containing at least a photocatalyst.

In the present invention, the photocatalyst used in the photocatalytic corrugated filter and 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,
Harmful substances are decomposed by OH radicals generated by photoexcitation. The shape of the photocatalyst is preferably in the form of particles, and particles having a specific surface area of 10 to 500 m ² / g are appropriately selected and used.

[0029] 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 photocatalytic corrugated filter and the water-resistant photocatalytic corrugated filter of the present invention, it is preferable to use a photocatalyst and a deodorant in combination. 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 combined use with a photocatalyst, particularly anatase-type powdered titanium dioxide, particles are preferable, and those having a specific surface area of 50 to 2,000 m ² / g. Is preferably selected and used. For example, in the case of activated carbon,
Those having a capacity of 1500 m ² / g are preferred.

In the present invention, when a photocatalyst and a deodorant are used together, it is preferable to form an aggregated composite of both. 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 particles 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 deodorant 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 a synthetic fiber or pulp. .

The synthetic fibers preferably used in the present invention are 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 of 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 encapsulated 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 spunbond method or the like is 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 enclosing type, at least two or more base materials are used, and after the composite aggregate is interposed in one of the base materials, 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 photocatalytic corrugated filter of the present invention is manufactured using a sheet containing a photocatalyst. In this case, any size and pitch size of the corrugate can be manufactured.

In the present invention, the following inorganic adhesives are preferably used as the corrugating adhesive. Alkali metal silicate, phosphate, sodium silicate (water glass), silica sol, phosphate cement, litharge cement, gypsum, portland cement, alumina cement, magnesium cement, iron cement, sulfur cement, low melting point Glass, crystalline low-melting glass, alumina sol-based, clay-based adhesives and the like can be preferably used.

In the present invention, the amount of the inorganic adhesive to be used varies depending on the constituent corrugated pitch and the like.
The amount used is preferably such that the adhesive does not protrude from the adhesive portion.

In the present invention, an ultraviolet-permeable inorganic porous adhesive is used as a corrugate-forming adhesive using a sheet containing at least a photocatalyst, and the thickness of the adhesive at the bonding portion is ultraviolet-permeable. Adhesives preferably used in the photocatalytic corrugated filter characterized by the following include the following. Alkali metal silicates, phosphates, sodium silicates (water glass), silica sols, low-melting glasses, crystalline low-melting glasses, alumina sols, and the like are preferably used.

In the present invention, the thickness of the adhesive which can transmit ultraviolet rays means that the corrugate and the liner are not in direct contact with each other, and the ultraviolet rays can be transmitted if the adhesive is interposed.

In the present invention, as a result of further detailed investigation, it has been found that a water-resistant photocatalytic corrugated filter can be obtained by using a mixture of alumina sol and polyvinyl alcohol as the corrugating adhesive.

In the present invention, as the alumina sol preferably used, ordinary alumina sol can be used. In addition, alumina sol takes various crystal systems such as a plate shape and a needle shape,
Any crystal form can be preferably used. At the same time, various polyvinyl alcohols mixed with the alumina sol can be preferably used. For example, completely saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, cationic polyvinyl alcohol, and the like can be preferably used.

In the present invention, the ratio of the mixture of alumina sol and polyvinyl alcohol is preferably 1 to 30% by weight of polyvinyl alcohol based on the solid content of alumina sol. Further, the content is preferably 5 to 15% by weight.

In the present invention, various hardeners can be used as the hardener to be added to polyvinyl alcohol, but the following are preferably used. Epoxy hardeners, aldehyde hardeners of formaldehyde and acetaldehyde, chlorosulfonic acid compound hardeners, phosphoric acid dichloride compounds, boric acid and the like are preferred. The addition amount also varies depending on the hardening agent, but is preferably about 0.3 to 10% by weight based on polyvinyl alcohol.

In the present invention, when a mixture of alumina sol and polyvinyl alcohol as an adhesive is used in such an amount that the thickness of the bonding portion can transmit ultraviolet rays, as described above, the corrugate and the liner are not in direct contact with each other. If an adhesive is interposed, ultraviolet rays can be transmitted.

[0052]

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.)
P25S6) 100 parts by weight, high silica zeolite (HSZ-690HOA, manufactured by Tosoh Corporation), composite ferrosilicate powder (Mizukanite AP, manufactured by Mizusawa Chemical Industry Co., Ltd.) 5
After adding and mixing 0 parts by weight in water, 5 parts of polyaluminum chloride (PAC, manufactured by Mizusawa Chemical Industry Co., Ltd.) was used as a coagulant.
Parts by weight, titanium dioxide, high silica zeolite,
An aggregated complex of complex ferrosilicate was formed. The aggregate was filtered, dried, and pulverized to prepare an aggregate.

(2) Preparation of Sheet A Containing Internally Added 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 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 Using the sheet A described in the above (2), using sodium silicate as an adhesive, size 300 (length) × 280 (width) × 10
(Width) mm, pitch size 4.1 mm, height 2.6 mm
The photocatalytic corrugated filter of Example 1 was produced to obtain Example 1.

Example 2 Using the sheet A described in the above (2), using a lithium silicate (manufactured by Nissan Chemical Co., Ltd .: lithium silicate 35) as an adhesive, size 300 (length) × 280 (width) × 1
0 (width) mm, pitch size 4.1 mm, height 2.6 m
The photocatalytic corrugated filter of Example 1 was manufactured to obtain Example 2.

Example 3 Using the sheet A described in the above (2), an alumina sol (catalyst AS-3 manufactured by Catalysis Chemical Industry Co., Ltd.) was used as an adhesive, and the size was 300 (length) × 280 (width) × 10
(Width) mm, pitch size 4.1 mm, height 2.6 mm
The photocatalyst corrugated filter of Example 3 was produced to obtain Example 3.

Example 4 Using the sheet B described in the above (3), using a lithium silicate (manufactured by Nissan Chemical Co., Ltd .: lithium silicate 35) as an adhesive, size 300 (length) × 280 (width) × 1
0 (width) mm, pitch size 4.1 mm, height 2.6 m
Example 4 was prepared as a photocatalytic corrugated filter of m.

Example 5 Using the sheet A described in the above (2), using lithium silicate (lithium silicate 35, manufactured by Nissan Chemical Co., Ltd.) as an adhesive, the thickness of the adhesive between the corrugate and the liner was about 0. Size 300 (vertical) x 28 so that it becomes .5mm
0 (width) x 10 (width) mm, pitch size 4.1 mm,
Example 5 A photocatalytic corrugated filter having a height of 2.6 mm was prepared to obtain a fifth embodiment.

Example 6 Using the sheet A described in the above (2), using alumina sol (catalyst AS-3, manufactured by Catalysis Chemical Industry Co., Ltd.) as an adhesive, the thickness of the adhesive between the corrugate and the liner was about Size 300 (vertical) x 280 to be 0.5mm
A photocatalytic corrugated filter having a size of (width) × 10 (width) mm, a pitch size of 4.1 mm and a height of 2.6 mm was prepared as Example 6.

Example 7 Using the sheet A described in (2) above, a saponification degree of 70%
A 10% aqueous solution of polyvinyl alcohol is prepared. Next, alumina sol (catalyst AS manufactured by Catalyst Chemical Industry Co., Ltd.)
The adhesive was adjusted by adding and mixing so that the solid content of polyvinyl alcohol in the aqueous solution was 10% by weight with respect to the solid content of -3). Next, using this adhesive, a corge size of 300 (length) × 280 (width) × 10
(Width) mm, pitch size 4.1 mm, height 2.6 mm
The photocatalytic corrugated filter of Example 7 was produced to obtain Example 7.

Example 8 Using the sheet A described in the above (2), the degree of saponification was 70%.
A 10% aqueous solution of polyvinyl alcohol is prepared. Next, alumina sol (catalyst AS manufactured by Catalyst Chemical Industry Co., Ltd.)
The adhesive was adjusted by adding and mixing so that the solid content of polyvinyl alcohol in the aqueous solution was 10% by weight with respect to the solid content of -3). Next, a 40% aqueous solution of acetaldehyde was added to this adhesive in an amount of 10% by weight based on the solid content of polyvinyl alcohol to obtain an adhesive. Using this adhesive, corrugate size 300 (vertical) x 280
A photocatalytic corrugated filter (width) × 10 (width) mm, a pitch size of 4.1 mm, and a height of 2.6 mm was manufactured to be Example 8.

Example 9 Using the sheet A described in the above (2), a saponification degree of 70%
A 10% aqueous solution of polyvinyl alcohol is prepared. Next, alumina sol (catalyst AS manufactured by Catalyst Chemical Industry Co., Ltd.)
The adhesive was adjusted by adding and mixing so that the solid content of polyvinyl alcohol in the aqueous solution was 10% by weight with respect to the solid content of -3). Next, using this adhesive, the thickness of the adhesive between the corrugate and the liner is 0.5 mm.
Corge size 300 (vertical) x 280 (horizontal)
× 10 (width) mm, pitch size 4.1 mm, height 2.
A 9 mm photocatalytic corrugated filter was manufactured as Example 9.

Comparative Example 1 Using the sheet A described in the above (2), using an ethylene-vinyl acetate emulsion as an adhesive, a size of 300 (length)
× 280 (width) × 10 (width) mm, pitch size 4.1
A photocatalytic corrugated filter having a height of 2.6 mm and a height of 2.6 mm was prepared as Comparative Example 1.

Comparative Example 2 Using the sheet A described in (2) above, a 10% aqueous solution of completely saponified polyvinyl alcohol was prepared as an adhesive.
Using this adhesive, size 300 (vertical) x 280
A photocatalytic corrugated filter having (width) × 10 (width) mm, a pitch size of 4.1 mm and a height of 2.6 mm was prepared as Comparative Example 2.

Comparative Example 3 Using the sheet A described in the above (2), using an ethylene-vinyl acetate emulsion as an adhesive, a size 300 (length) such that the thickness of the adhesive between the corrugate and the liner was about 0.5 mm. ) × 280 (horizontal) × 10 (width) mm, a photocatalytic corrugated filter having a pitch size of 4.1 mm and a height of 2.6 mm were prepared as Comparative Example 3.

Comparative Example 4 Using the sheet A described in (2) above, a 10% aqueous solution of completely saponified polyvinyl alcohol was prepared. Next, a 40% aqueous solution of acetaldehyde was added to this aqueous solution in an amount of 10% by weight based on the solid content of completely saponified polyvinyl alcohol to obtain an adhesive. Using this adhesive, size 300 (vertical)
× 280 (width) × 10 (width) mm, pitch size 4.1
A photocatalyst corrugated filter having a height of 2.6 mm and a height of 2.6 mm was prepared as Comparative Example 4.

Comparative Example 5 Using the sheet A described in the above (2), a 10% aqueous solution of completely saponified polyvinyl alcohol was prepared as an adhesive.
Using this adhesive, size 300 (vertical) so that the thickness of the adhesive between the corrugate and the liner is about 0.5 mm
× 280 (width) × 10 (width) mm, pitch size 4.1
A photocatalytic corrugated filter having a height of 2.6 mm and a height of 2.6 mm was prepared as Comparative Example 5.

<Evaluation of Corrugated Filter Condition by Irradiation with High-Intensity Ultraviolet Light> Examples 1 to 9 and Comparative Examples 1 to 5
Each of the photocatalytic corrugated filters prepared in
The sample was cut out to 0 × 100 × 10 mm to obtain a sample for ultraviolet irradiation. Next, 100mm directly under the high intensity UV lamp for printing
The sample cut above was placed in the above, and irradiated with ultraviolet light for about 1 hour. At this time, the UV intensity of the sample setting place was 10 mW.
/ Cm2. Thereafter, the sample was held in a hand and the degree of peeling of the bonded portion was observed. Table 1 shows the results.

[0071]

[Table 1]

<Evaluation of Photocatalytic Activity> The above Examples 5, 6 and
9. The photocatalyst corrugated filters produced in Comparative Examples 1 to 5 were each cut into 30 × 30 × 10 mm to obtain a photocatalytic activity evaluation sample. A corrugate was placed in a 5.6 L sealed plastic box provided with a 6 W UV lamp and a stirring fan at a distance from the lamp at a strength of 1 mw / cm ² . After closing the box, acetaldehyde is injected into the box so as to be 40 ppm, and measurement is started. At this time, the lamp is also turned on. After 60 minutes, the concentration of acetaldehyde in the box was measured by detection. Table 2 shows the results.

[0073]

[Table 2]

<Evaluation of Water Resistance of Photocatalytic Corrugated Filter> The photocatalytic corrugated filters prepared in Examples 7 to 9 and Comparative Examples 2, 4, and 5 were replaced with a new fresh air filter (Photocatalyst air purifier manufactured by Mitsubishi Paper Mills, Ltd.). ) The photocatalyst filter was removed, and the dust filter and the photocatalyst deodorizing filter were installed in the prefilter installation portion. The size of the photocatalyst deodorizing filter produced in the example and the comparative example fits 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, the UV lamp 2 is located downstream of the photocatalytic deodorizing filter.
I set up a book.

Next, the deodorizing performance was evaluated in accordance with the deodorizing performance test of a household air purifier according to the Japanese Industrial 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 deodorizing corrugated filter was immersed and washed in a 10% aqueous solution of detergent "Attack" (manufactured by Kao) for 3 days. Remove the filter from the wash water, rinse the detergent well with water and allow to air dry. When removing the filter from the wash water, carefully observe the condition,
The water resistance was evaluated. Table 3 shows the results.

[0077]

[Table 3]

[0078]

As described above, the results of Tables 1 to 3 show that a photocatalyst corrugate which can be exposed to high-intensity ultraviolet rays, increases the area where the photocatalyst acts, and prevents a decrease in photocatalytic activity by washing with water is obtained. Do you get it.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI theme coat ゛ (reference) B01J 35/02 B01D 53/36 ZABG // A61L 9/18 102D F-term (reference) 4C080 AA07 BB02 CC01 HH05 JJ06 KK08 QQ03 4D048 AA02 AA06 AA17 AA22 AB03 AB05 BA03X BA06X BA07X BA11X BA42X BB08 BB11 CD10 EA01 EA04 EA07 4G069 AA03 AA08 BA04B BA07B BA15B BB06B BC16B BC66B CA02 CA03 CA10 CA12 CA13

Claims (5)

[Claims] 1. A photocatalytic corrugated filter comprising a sheet containing at least a photocatalyst, wherein the inorganic adhesive is used as a corrugating adhesive. 2. An ultraviolet-permeable inorganic porous adhesive is used as a corrugate-forming adhesive using a sheet containing at least a photocatalyst, and the thickness of the adhesive at the bonding portion is permeable to ultraviolet light. Features a photocatalytic corrugated filter. 3. A water-resistant photocatalytic corrugated filter, wherein a mixture of alumina sol and polyvinyl alcohol is used as a corrugating adhesive using a sheet containing at least a photocatalyst. 4. The water-resistant photocatalytic corrugated filter according to claim 2, wherein the corrugating adhesive is a mixture of alumina sol and polyvinyl alcohol. 5. The water-resistant photocatalytic corrugated filter according to claim 3, wherein a crosslinking agent for polyvinyl alcohol is added.