JPH09313887A - Photocatalyst sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a photocatalyst sheet that the sheet can be used by sticking to a conventional device, apparatus, member or building material to purify air or water or to remove odors or contaminants of the environment, and thereby, the sheet can be easily processed after the production to give an effect to purify the environment such as to decompose odors. SOLUTION: A photocatalyst 3 is applied on the surface of a base body 2 and an adhesive is applied on the back surface of the base body 2. The obtd. sheet is stuck to a device, apparatus, member or building material so that it gives a function to decompose odors or the like and to purify the environment by producing active oxygen and OH radicals on the photocatalyst when the sheet is irradiated with light. The sheet hardly requires maintenance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purification material for offensive odors and environmental pollutants diffused in the air or water.

[0002]

2. Description of the Related Art Conventionally, as this kind of environmental purification material, the one described in JP-A-5-49861 is known.

The sheet-like environmental purification device will be described below with reference to FIGS. As shown in FIG.
From a porous first layer 102 having selective permeability or adsorptivity to pollutants, a second layer 103 of a photocatalyst or a carrier carrying a photocatalyst, and a protective layer 104 transparent in the wavelength region from the visible region to the ultraviolet region. The first layer adsorbs environmental pollutants and the second layer adsorbs environmental pollutants on the first layer by photocatalytic action. The third layer has mechanical strength. FIG. 6 shows a specific example of the case where an environmental purification sheet is used. A column is provided in the atmosphere, and a plurality of disassembling sheets are attached to the column.

[0004]

When using such a conventional sheet-like environmental purification device, it is necessary to newly install a column or the like as described above and further attach a sheet to the column. Therefore, a new installation place is required.

The present invention solves such a conventional problem, and since it can be easily pasted and used, it does not require a new installation site and is easy to use for existing equipment or members. The purpose is to provide a photocatalyst sheet that can have an environmental purification function by post-processing.

It is another object of the present invention to provide a photocatalyst sheet which can be easily attached to a device or member having a curved surface by using a flexible base material so as to have an environmental purifying function.

Another object of the present invention is to provide a photocatalyst sheet having a long life without deterioration due to autocatalysis by providing a photocatalyst layer on the surface of the base material through a material which is not subject to photocatalysis.

Another object of the present invention is to provide a photocatalyst sheet which can be rolled and made compact during transportation by attaching a separator which is easily peeled off to the surface of the adhesive, and which is easy to work.

Another object of the present invention is to provide a photocatalyst sheet having a light-reflecting material as a base material and having an indirect lighting effect when it is attached to a reflection plate, a ceiling, a wall or the like of a lighting device.

Another object of the present invention is to provide a photocatalyst sheet which is made of a visible light transmitting material as a base material and which does not reduce the light amount even when it is used by being attached to a casing of a lighting device.

Another object of the present invention is to provide a photocatalyst sheet which can be used by being attached to a movable part by using a stretchable material as a base material.

Another object of the present invention is to provide a photocatalyst sheet having a hygroscopic material as a base material and having an enhanced environmental purification function by a photocatalytic reaction.

Another object of the present invention is to provide a photocatalyst sheet in which the adhesive is easily peeled and a re-adhesive material is used to improve the usability and facilitate the processing.

Another object of the present invention is to provide a photocatalyst sheet having an improved environmental purification speed by providing a gas adsorbent layer between the photocatalyst layer and the surface of the substrate.

[0015]

One means of the photocatalyst sheet of the present invention for solving the above problems is to provide a photocatalyst layer on the front surface and apply an adhesive on the back surface.

Another means is to provide a photocatalyst layer on the surface of a flexible base material and apply an adhesive on the back surface.

Another means is to coat the surface of a sheet-shaped or tape-shaped substrate with a photocatalyst through a material that does not act as a photocatalyst, and apply an adhesive to the back surface.

Another means is to attach an easily peelable separator on the surface of the adhesive. In addition, another means uses a light-reflecting material as a base material.

Another means is to use a visible light transmitting material as a base material. In addition, another means uses a stretchable material as a base material.

Another means is to use a hygroscopic material as a base material. Another means is to use an adhesive which is easy to peel and is a re-adhesive material.

Another means is to provide a gas adsorbent layer between the photocatalyst layer and the surface of the substrate.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is one in which a photocatalyst layer is provided on the front surface and an adhesive is applied to the back surface, and the photocatalyst function is provided by attaching it to equipment, building materials, etc. It has the effect that The invention according to claim 2 is one in which a photocatalytic layer is provided on the surface of a flexible base material and an adhesive is applied to the back surface thereof, and it can be easily attached to a material having a curved surface and can have a photocatalytic function. Have an effect.

According to a third aspect of the present invention, a sheet-shaped or tape-shaped substrate surface is coated with a photocatalytic material through a material that does not undergo a photocatalytic action, and an adhesive is applied to the back surface of the substrate. The photocatalyst sheet has the function of prolonging its life without being deteriorated by autocatalysis. The invention described in claim 4 is a photocatalyst sheet with an easily peelable separator attached to the adhesive surface, and has a function of being compact and easy to carry and improving workability. Claim 5
The invention described in (1) has an effect of having an indirect illumination effect when it is attached to a reflection plate of a lighting device by using a light-reflecting material as a base material. In the invention according to claim 6, the visible light transmitting material is used as a base material so that the amount of light is not reduced even when it is used by being attached to a lighting device casing, and the ground color of the attached device, member, building material, etc. is not impaired. Has the effect of. The invention according to claim 7 has an effect that it can be attached to a movable part and used by using a stretchable material as a base material. The invention according to claim 8 has the action of strengthening the environmental purification function by a photocatalytic reaction by using a hygroscopic material as a base material. The invention according to claim 9 has the effect of improving the usability and facilitating the processing by using the adhesive as a re-adhesive material that can be easily peeled off. The invention according to claim 10 has an effect of improving the environmental purification speed by providing the gas adsorbent layer between the photocatalyst layer and the surface of the base material.

[0024]

Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that components having the same configuration are denoted by the same reference numerals and detailed description thereof will be omitted.

(Embodiment 1) FIG. 1 is a sectional view of a photocatalyst sheet 1. In FIG. 1, the surface of a substrate 2 is coated with a photocatalyst 3 and the back surface of the substrate 2 is coated with an adhesive 4. To be done. In the above structure, the photocatalyst sheet 1 is bonded to a flat surface of a device, a member, a building material, etc. as shown in FIG.
When irradiated with light, active oxygen and OH radicals are generated on the photocatalyst to decompose and purify foul odors, oils and the like, and a bactericidal action is exhibited, and almost no maintenance is required.

As the photocatalyst 1, a semiconductor simple substance such as anatase type titanium dioxide, zinc oxide, tungsten oxide, cadmium sulfide or copper oxide, or a metal such as platinum, rhodium, palladium, rhodium oxide or cerium oxide, or a metal oxide is added. Examples thereof include those that are carried, but any substance that exhibits a catalytic action by being irradiated with light may be used. Examples of the base material include glass and ceramic boards, but any material can be used as long as it can coat the photocatalyst. The photocatalyst coating method may be dip coating, roll coating, spin coating, screen printing, or the like, but the same effect can be obtained by other methods as long as the photocatalytic layer can be provided on the surface of the substrate. Examples of the adhesive include acrylic resin, polyamide resin, epoxy resin, phenoxy resin, and styrene-based adhesive, but any adhesive may be used as long as it can bond the photocatalyst sheet to equipment, building materials, members, and the like.

(Second Embodiment) A flexible material is used for the base material 2, the front surface is coated with a photocatalyst layer, and the back surface is coated with an adhesive. In the above structure, by using a flexible material, it is possible to easily attach it to equipment, members, etc. having a curved surface, which has the effect of expanding the range of application of the photocatalyst sheet.

Examples of the flexible material of the base material 2 include polyethylene, polypropylene, ABS resin, fluororesin, vinyl chloride resin, silicone resin and the like, but any flexible material may be used. In this embodiment, the photocatalyst is coated on the surface of the base material, but there is no problem even if the photocatalyst component and the base material are mixed and rolled, and the photocatalyst layer is in contact with the atmosphere. Good.

(Embodiment 3) FIG. 3 shows a photocatalyst sheet 1a.
FIG. 3 is a cross-sectional view of FIG. 3, in which a layer of the material 6 which is not subjected to the photocatalytic action is provided between the base material 2 and the photocatalyst 3. In the above structure, the photocatalyst sheet 2 can suppress deterioration of the base material 2 due to the catalytic action of the photocatalyst 3, and can be used semipermanently.

Examples of the material 4 which does not undergo photocatalytic action include inorganic materials such as silica, alumina and metals.

(Embodiment 4) FIG. 4 shows a photocatalyst sheet 1b.
4 shows a cross-sectional view of FIG. 4, and in FIG. 4, an easily peelable separator is attached to the surface of the adhesive 4. The separator may be a polymer film or paper coated with a surfactant, but any separator may be used as long as it is easily peeled off.

(Embodiment 5) The use of a light-reflecting material for the base material 2 has the effect of obtaining a photocatalyst sheet having an indirect illumination effect when it is attached to a reflector, ceiling, wall or the like of an illuminating device.

Examples of the light reflecting material include metal materials such as aluminum and white materials.

(Embodiment 6) A base material 2 is formed by using a visible light transmitting material, a photocatalyst layer is provided on the front surface, and an adhesive is applied on the back surface. With the above-mentioned structure, the visible light transmitting material is used as a base material, so that it has an effect that the amount of light is not reduced even when it is used by being attached to the casing of an illumination device, and the ground color of the attached device, member, building material, etc. is not impaired. The material used for the material 2 includes cellophane, polypropylene, nylon, polyethylene terephthalate, polyvinyl alcohol, polyvinylidene chloride and the like, but any material that transmits visible light may be used.

(Embodiment 7) A base material 2 is made of a stretchable material, a photocatalyst layer is provided on the front surface, and an adhesive is applied on the back surface. With the above configuration, it has an effect that it can be attached to a movable part for use. The material used for the material 2 may be a rubber sheet, polyethylene gel, urethane gel or the like, but any material having elasticity may be used.

(Embodiment 8) A substrate 2 is made of a hygroscopic material, a photocatalyst layer is provided on the front surface, and an adhesive is applied to the back surface. The above configuration has the effect of enhancing the environmental purification function by the photocatalytic reaction.

As the hygroscopic material, ABS resin, acetal resin, methacrylic resin, nylon 6, nylon 6
6, polar plastics such as vinyl chloride resin, epoxy resin, and phenol resin can be used, but any material that traps moisture in the air and assists the photocatalytic reaction may be used. Further, although the base material 2 is made of the hygroscopic material in the present embodiment, the same effect can be obtained by forming the photocatalyst layer by mixing the photocatalytic material and the hygroscopic material such as zeolite.

(Embodiment 9) A surface of a substrate is coated with a photocatalyst, and a rear surface of the substrate is coated with a re-adhesive adhesive which is easy to peel off. The above configuration has the effect of improving usability and facilitating processing. The adhesive may be a high-viscosity acrylic resin, a styrene resin, or the like, but any adhesive may be used as long as it is easily peeled and has re-adhesiveness.

(Embodiment 10) A gas adsorbent layer 11 is provided between the photocatalyst layer and the surface of the substrate. The above configuration has the effect of improving the environmental purification speed. Silica gel is preferable for the gas adsorbent layer because it is transparent, but any gas adsorbent such as zeolite may be used.

[0040]

As described above, according to the present invention, a photocatalyst sheet having a front surface coated with a photocatalyst layer and a back surface coated with an adhesive can be easily attached to devices, building materials, members, etc. The advantageous effect that an environmental purification mechanism such as deodorization and antifouling can be easily provided by post-processing is obtained.

Further, a photocatalyst layer is provided on the surface of the flexible substrate,
Equipment with curved surface by applying adhesive on the back side,
Since it can be easily attached to building materials and members, it has an advantageous effect that it can easily have an environmental purification mechanism such as deodorization and antifouling by post-processing. In addition, by coating the photocatalytic material on the surface of a sheet-shaped or tape-shaped base material through a material that does not undergo photocatalytic action and applying an adhesive on the back surface, the photocatalytic sheet does not deteriorate due to autocatalytic action and has a long life. The advantageous effect of becoming is obtained. Also, by attaching a separator that is easily peeled off to the adhesive surface, it is possible to obtain an advantageous effect that it is compact and easy to carry when it is transported and the workability is improved. In addition, by using a light-reflecting material as a base material, it is possible to obtain an advantageous effect that it has both an environmental purification function and an indirect lighting effect when it is attached to a reflection plate, a ceiling, a wall surface or the like of a lighting device. Also, by using a visible light transmissive material as a base material, it is possible to obtain an advantageous effect that the amount of light is not reduced even when used by being attached to a lighting device casing, and the ground color of the device, member, building material, etc. to be attached is not impaired. . In addition, the use of a stretchable material as a base material has an advantageous effect that it can be used by being attached to a movable part. Further, by using a hygroscopic material as a base material, an advantageous effect of enhancing the environmental purification function by the photocatalytic reaction can be obtained. In addition, by using the adhesive as a re-adhesive material that can be easily peeled off, it is possible to obtain an advantageous effect that the usability is improved and the processing is facilitated. Further, by providing the gas adsorbent layer between the photocatalyst layer and the surface of the substrate, the advantageous effect of improving the environmental purification speed can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a catalyst sheet 1 according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view showing an example of how to use the catalyst sheet 1 according to Embodiment 1 of the present invention.

FIG. 3 is a sectional view showing a catalyst sheet 1a according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing a catalyst sheet 1b according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional sheet-like environmental purification device.

FIG. 6 is a cross-sectional view showing an example of a method for installing a conventional sheet-like environmental purification device.

[Explanation of symbols]

 1 Photocatalyst sheet 1a Photocatalyst sheet 1b Photocatalyst sheet 2 Base material 3 Photocatalyst 4 Adhesive 5 Member 6 Material not subject to photocatalytic action 7 Separator 8 Gas adsorbent 101 Conventional environmental pollutant decomposition sheet 102 Porous environmental pollutant decomposition sheet Quality layer 103 Photocatalyst layer of a conventional environmental pollutant decomposition sheet 104 Protective layer of a conventional environmental pollutant decomposition sheet 105 Pillar for installing a conventional environmental pollutant decomposition sheet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display area F21V 7/22 F21V 7/22 A B01D 53/36 H (72) Inventor Kazumi Kato Aichi Aichi Prefecture 2-15-15 Wagogaoka, Togo-cho, Gunma (72) Inventor Eiji Watanabe Eiji Watanabe 41-chome, Kota Nitta, Saya-cho, Kaifu-gun, Aichi Prefecture (72) Yoshiomi Takasaka 6-chome, Imafuku Nishi, Joto-ku, Osaka City, Osaka Prefecture 2-61 Matsushita Seiko Co., Ltd. (72) Inventor Takahiro Nakajima 6-61, Imafuku Nishi, Joto-ku, Osaka City, Osaka Prefecture Matsushita Seiko Co., Ltd.

Claims (10)

[Claims] 1. A photocatalyst sheet which can be attached to a device, a member or the like by providing a photocatalyst layer on the front surface and applying an adhesive on the back surface to have a photocatalytic function. 2. A photocatalyst sheet which can be easily attached to a material having a curved surface by providing a photocatalyst layer on the surface of a flexible base material and applying an adhesive on the backside thereof, and which can have a photocatalytic function. 3. The photocatalyst sheet according to claim 1, wherein the surface of the sheet-shaped or tape-shaped base material is coated with a photocatalytic material through a material that does not undergo a photocatalytic action, and an adhesive is applied to the back surface of the base material. 4. The photocatalyst sheet according to claim 1, 2 or 3, wherein an easily peelable separator is attached to the surface of the adhesive. 5. A light reflective material as a base material according to claim 1, 2.
The photocatalyst sheet according to 3 or 4. 6. A visible light transmitting material as a base material,
The photocatalyst sheet of 2, 3, 4 or 5. 7. A stretchable material as a base material according to claim 1, 2.
The photocatalyst sheet according to 3, 4, 5 or 6. 8. The method according to claim 1, wherein a hygroscopic material is used as a base material.
The photocatalyst sheet according to 3, 4, 5, 6 or 7. 9. The photocatalyst sheet according to claim 1, wherein the adhesive is a re-adhesive material which is easily peeled off. 10. The photocatalyst sheet according to claim 1, wherein a gas adsorbent layer is provided between the photocatalyst layer and the surface of the base material.