JP4026042B2 - Photocatalyst, lamp and lighting fixture - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a photocatalyst, a lamp using the photocatalyst, and a lighting fixture.
[0002]
[Prior art]
It is known to use a photocatalytic film for deodorizing, antifouling and / or antibacterial.
[0003]
When the photocatalyst film is irradiated with ultraviolet rays and absorbs the light energy, electrons and holes are generated in the semiconductor that constitutes the photocatalyst film and exhibits a photocatalytic action. Electrons and holes react with oxygen and water on the film surface to generate active oxygen and other active radicals, and are said to be oxidized and reduced by decomposing and contaminating organic components.
[0004]
Of the substances having photocatalytic activity, titanium oxide is currently most promising. This is because titanium oxide has a remarkable photocatalytic action, is a safe and industrially reasonable price, and can be obtained in a necessary amount.
[0005]
Recently, attention has been paid to the usefulness of photocatalytic films, and there is an active movement to form photocatalytic films on a wide range of articles such as building materials, lighting fixtures, and lamps.
[0006]
Although there are various methods for producing a photocatalytic film, a so-called dip method and an ultrafine particle dispersion coating method are generally used.
[0007]
In the so-called dip method, a metal alkoxide constituting a photocatalytic film on a substrate, for example, when the photocatalytic film is titanium oxide, a coating liquid containing titanium alkoxide is applied and baked at a temperature of 400 to 500 ° C. It is a method of forming. The photocatalyst film obtained by this production method is durable because of its excellent film strength.
[0008]
The ultrafine particle dispersion coating method is a method in which a photocatalytic film is obtained by coating a substrate with a water-soluble dispersion in which photocatalytic ultrafine particles such as titanium oxide are dispersed in a solution made of water, alcohol, or the like, and baking it. . The photocatalytic film obtained by this production method has high crystallinity and excellent photocatalytic properties.
[0009]
[Problems to be solved by the invention]
If the photocatalyst film obtained by the so-called dip method is not baked at a high temperature for a long time, there is a problem that the crystallinity on the film surface is insufficient and the photocatalytic property is low. In the case where the substrate is a soft glass such as soda lime glass, the glass has a relatively low softening temperature and cannot be fired at a required high temperature, so that it is difficult to obtain sufficient photocatalytic properties.
[0010]
Further, when the photocatalyst film is formed by the above manufacturing method, the photocatalyst film mainly composed of titanium oxide is larger in refractive index than that of glass. There is also a problem that the rate decreases.
[0011]
Therefore, in order to solve these problems in the dip method, the applicant first added a metal oxide such as silica to the photocatalyst film to reduce the refractive index of the photocatalyst film, so that it is almost equal to the glass of the substrate. This was filed as Japanese Patent Application No. 9-14372. According to the invention of this application, it was possible to reduce the refractive index of the photocatalytic film by adding a metal oxide to prevent the light transmittance from being lowered and to prevent interference color from being generated.
[0012]
On the other hand, in the ultrafine particle dispersion coating method, it is difficult to obtain sufficient adhesion to the substrate, and when an organic binder is used, cracks are likely to occur in the binder. When cracks occur in the binder, there is a problem that the transmittance is reduced due to white turbidity.
[0013]
The present invention provides a photocatalyst having improved photocatalyst film formation by an ultrafine particle dispersion coating method to improve adhesion of the photocatalyst film to a substrate and having good light transmittance, and a lamp and a lighting fixture using the same. The main purpose is to do.
[0014]
[Means for achieving the object]
The photocatalyst according to claim 1 is composed of a substrate and at least one oxide fine particle selected from the group consisting of aluminum, zirconium and silicon, and a polysiloxane as a main layer, and the average particle size of the oxide fine particle is 10 An underlayer formed on the substrate so that the molar ratio of the oxide fine particles in the layer is 40 to 90%; and titanium oxide ultrafine particles having an average particle size smaller than the oxide fine particles And a photocatalyst film formed on the surface of the underlayer with a depth not less than the average particle diameter of the oxide fine particles of the underlayer and entering between the oxide fine particles of the underlayer . It is characterized by.
[0015]
According to a second aspect of the present invention, in the photocatalyst according to the first aspect, the average particle diameter of the titanium oxide ultrafine particles of the photocatalytic film is 4 to 10 nm.
[0016]
A third aspect of the present invention is the photocatalyst according to the first or second aspect, wherein the composite layer composed of the underlayer and the photocatalytic film has an average linear light transmittance of 90% or more.
[0017]
A fourth aspect of the present invention is the photocatalyst according to any one of the first to third aspects, wherein the titanium oxide ultrafine particles of the photocatalytic film are mainly composed of anatase crystals.
[0018]
According to a fifth aspect of the present invention, in the photocatalyst according to any one of the first to third aspects, the ultrafine titanium oxide particles of the photocatalytic film are a mixture of anatase crystals and rutile crystals.
[0019]
A sixth aspect of the present invention is the photocatalyst according to any one of the first to fifth aspects, wherein the titanium oxide ultrafine particles of the photocatalyst film enter between the oxide fine particles of the underlayer at a depth greater than the average particle diameter of the fine particles of the underlayer. As a result of soaking in the underlayer, the abundance ratio of the titanium oxide ultrafine particles increases and the refractive index of the underlayer continuously changes from the base side of the underlayer toward the surface side of the underlayer. It is characterized by.
[0020]
In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
[0021]
(About the substrate)
[0022]
The substrate carries a photocatalyst film and is formed not only for a member exclusively intended for carrying a photocatalyst film but also for other functions not originally intended for carrying a photocatalyst (hereinafter referred to as “functional material”). ”).
[0023]
Functional materials include various desired members such as building materials such as tiles, window glass, and ceiling panels, kitchen and sanitary equipment, home appliances, lighting equipment, deodorizing or dust collecting filters. It can be a substrate.
[0024]
The base material is allowed to be metal, glass, ceramics (including porcelain), earthenware, stone, synthetic resin and wood.
[0025]
When the substrate is formed by baking the photocatalyst film at a high temperature, the substrate needs to have heat resistance capable of withstanding the baking.
[0026]
(Underlayer)
[0027]
In the present invention, the photocatalyst film is not directly deposited on the surface of the substrate, but is formed on the substrate via the base layer. The underlayer is mainly composed of at least one oxide fine particle and silicon compound selected from the group consisting of aluminum (Al), zirconium (Zr), and silicon (Si), as the metal oxide fine particles contained in the underlayer. The average particle diameter of the oxide fine particles is in the range of 10 to 60 nm. The molar ratio (mol%) of the oxide fine particles in the underlayer is in the range of 40 to 90%. The average particle size of the oxide fine particles can be obtained by averaging the primary particle size of the oxide fine particles present in the cross section of the under layer observed with an electron microscope or the like, and the molar ratio can be obtained by the SIMS method.
[0028]
The underlayer preferably has a porous surface on the side of the photocatalyst film. For example, the surface may have an uneven surface that does not optically reduce the transmittance. Since the underlayer is mainly composed of oxide fine particles, it has good compatibility with the photocatalyst film mainly composed of titanium oxide and can be firmly bound to the substrate by firing.
[0029]
Preferably, the oxide fine particles contained in the underlayer have an average particle diameter of 10 to 40 nm and a molar ratio of 40 to 90%. Under these conditions, it was found that the linear transmittance of visible light can be further increased and the ultraviolet absorption of the underlayer can be almost eliminated. Therefore, the photocatalyst body provided with such an underlayer has high optical characteristics and can obtain a high photocatalytic effect.
[0030]
When the oxide fine particles of the underlayer are oxides selected from materials other than the group consisting of aluminum (Al), zirconium (Zr), and silicon (Si), the underlayer stability cannot be ensured. There are problems that the rate increases, the visible transmittance decreases due to the occurrence of light interference, and the underlayer absorbs ultraviolet rays.
[0031]
When the average particle size of the oxide fine particles in the underlayer is less than 10 nm, the wettability of the photocatalyst film is deteriorated, the strength of the photocatalyst film is lowered and the film is easily peeled off, and the adhesion to the underlayer is deteriorated. On the other hand, when the average particle diameter exceeds 60 nm, the total visible light transmittance is good, but light diffusion tends to occur, and the linear transmittance decreases. If the amount of oxide fine particles is less than 40 mol%, the adhesion of the photocatalyst film to the underlayer tends to be reduced, and if it exceeds 90 mol%, the strength of the underlayer and the linear transmittance are likely to be reduced. Further, if the average particle diameter of the titanium oxide ultrafine particles constituting the photocatalyst film is set to be equal to or less than the average particle diameter of the oxide fine particles of the underlayer, the organic matter decomposition property of the photocatalytic effect is deteriorated.
[0032]
Further, the metal oxide constituting the underlayer is made to have a refractive index gradient structure having an intermediate refractive index between a substrate having a low refractive index and a photocatalytic film having a high refractive index, such as soda lime glass. Therefore, it is possible to provide effects such as suppression of light interference and prevention of reflection.
[0033]
The underlayer can be formed, for example, by preparing a coating solution obtained by diluting oxide fine particles and polysiloxane as a silicon compound with an organic solvent, coating the substrate, and baking the substrate.
[0034]
The visible average linear transmittance of the underlayer is desirably 90% or more. The same applies to the photocatalytic film. As a result, when a substrate having a high visible light transmittance such as glass is used, the amount of visible light transmitted through the base layer and the photocatalyst layer is hardly reduced, so that it can be used in various applications such as lighting equipment and light sources. The present invention can also be applied.
[0035]
This visible average linear transmittance is the transmittance of only two layers excluding reflection absorption at the substrate. For example, if the substrate is glass, a substrate glass without a layer may be used as a reference to measure the transmission characteristics. In the case of a reflective member, similarly, a base of a non-layered reflective member as a reference may be inserted to measure and convert the reflection characteristics.
[0036]
(About photocatalytic film)
[0037]
The photocatalytic substance has titanium oxide (TiO ₂ ) as a main component. Titanium oxide is currently most promising as a photocatalytic substance because it has a remarkable photocatalytic action and is available in a safe and industrially reasonable price and in a necessary amount.
[0038]
Titanium oxide includes a rutile crystal and an anatase crystal as its crystal structure. The photocatalytic action is said to be superior to the anatase form.
[0039]
Accordingly, in the present invention, it is preferable to use anatase crystal titanium oxide. However, in practice, there are many cases where rutile crystals are mixed with anatase crystals, and when using ultrafine titanium oxide particles, a practical photocatalytic action can still be obtained. Allows a mixed mode of both. Furthermore, the decomposability of organic substances changes depending on the mixing ratio.
[0040]
Furthermore, in the present invention, a photocatalytic substance other than titanium oxide may be added as a subcomponent in the photocatalytic film. Other photocatalytic materials include the following. WO ₃ , LaRhP ₃ , FeTiO ₃ , Fe ₂ O ₃ , CdFe ₂ O ₄ , SrTiO ₃ , CdSe, GaAs, GaP, RuO ₂ , ZnO, CdS, MoS ₃ , LaRhO ₃ , CdFeO ₃ , Bi ₂ O ₃ , MoS ₂ , In ₂ O ₃ , CdO, SnO ₂ and the like. These substances can be used alone or in combination.
[0041]
TiO ₂ , WO ₃ , SrTiO ₂ , Fe ₂ O ₃ , CdS, MoS ₃ , Bi ₂ O ₃ , MoS ₂ , In ₂ O ₃ , CdO, etc. have a conduction band whose absolute value of the redox potential of the equivalent electron band is the conduction band. Since its redox potential is larger than the absolute value, its oxidizing power is larger than its reducing power, and it is excellent in deodorizing action, antifouling action or antibacterial action due to decomposition of organic compounds.
[0042]
Of these materials, Fe ₂ O ₃ and ZnO are superior in terms of raw material costs.
[0043]
Furthermore, in the present invention, titanium oxide is used in the form of ultrafine particles. The ultrafine particles are extremely fine particles having an average particle diameter of 4 to 10 nm. Preferably, the shape of the fine particles is as close to a sphere as possible, and the particles have a small variation in particle diameter and have good crystallinity.
[0044]
Furthermore, when the photocatalyst film has irregularities formed on the surface of the underlayer, the photocatalyst film can partially enter and adhere to the irregularities.
[0045]
Furthermore, when the underlayer of the present invention is formed of a porous material, the ultrafine particles of titanium oxide in the photocatalyst film partially soak not only into the surface of the underlayer but also into the inside. “Infiltrate” means that the ultrafine particles of titanium oxide have penetrated between the ultrafine particles of the underlayer at a depth equal to or greater than the average particle size of the fine particles of the underlayer. Therefore, titanium oxide having a high refractive index is substantially mixed in the base layer, and the refractive index of the base layer is adjusted to approach the refractive index of the photocatalyst film. As the abundance ratio of the titanium oxide ultrafine particles increases from the substrate side to the surface side of the underlayer, the refractive index of the underlayer changes continuously, which is caused by the difference in refractive index at the interface. Optical interference is suppressed. Further, when the ultrafine particles of titanium oxide soak into the underlayer, it is possible to firmly adhere.
[0046]
In addition, baking can be performed in 150-degree C or more, for example, 300-600 degreeC.
[0047]
Furthermore, a small amount of silicon dioxide, aluminum oxide, zirconium oxide or silicone can be added to the photocatalyst film. These act as binders.
[0048]
Since the photocatalyst film is mainly composed of ultrafine particles of titanium oxide, the photocatalytic action is strong as in the case of the conventional photocatalyst film using ultrafine titanium oxide.
[0049]
(Operation of the present invention)
[0050]
Since the photocatalyst body of the present invention has the above-described configuration, the following effects are exhibited.
[0051]
(1) The photocatalytic action is good.
[0052]
High photocatalysis can be obtained by the ultrafine particles having good crystallinity.
[0053]
(2) The strength of the photocatalytic film is large.
[0054]
Since the titanium oxide ultrafine particles are attached to the surface of the underlayer composed of fine oxide particles with good adhesion, and the titanium oxide ultrafine particles are partially infiltrated into the porous underlayer, the photocatalytic film adheres to it. The photocatalytic film has high strength and high strength.
[0055]
(3) The underlayer and the photocatalytic film have high transmittance in the visible light region.
[0056]
An underlying layer with an apparently lower refractive index than porous titanium oxide is formed on the surface of the substrate, reducing light reflection between the glass substrate and the photocatalyst film, improving visible light transmittance When glass is used for the substrate, visible light transmittance equal to or higher than that of the dough glass can be obtained. Further, when the underlayer is porous, a part of the titanium oxide ultrafine particles soaks into the underlayer, and the visible light transmittance is further increased because the interface is inhomogeneous.
[0057]
(4) The ultraviolet ray transmission property of the underlayer is high, and the utilization efficiency of ultraviolet rays in the photocatalytic film is high.
[0058]
The metal oxide fine particles contained in the underlayer are at least one oxide selected from the group consisting of aluminum (Al), zirconium (Zr), and silicon (Si), and have an average particle size of 10 to 60 nm. And since the molar ratio is in the range of 40 to 90%, the underlayer hardly absorbs ultraviolet rays of 400 nm or less, has high ultraviolet transmission characteristics, and has high ultraviolet utilization efficiency of the photocatalytic film.
[0059]
(5) The film formability and coating property of the photocatalyst film are good.
[0060]
When the underlayer is porous, water (H ₂ O) is easily contained and the wettability is improved, so that the adhesion of the photocatalytic film is improved.
[0061]
The lamp of claim 7 is a lamp main body that emits light including light having a wavelength of 400 nm or less with a glass bulb surrounding the light emitting portion; and the glass bulb is used as a base and is attached to at least the outer surface thereof. Any one of the photocatalysts according to the present invention.
[0062]
The lamp of the present invention does not ask the light emission principle. For example, it is allowed to be an incandescent bulb or a discharge lamp.
[0063]
In the case of an incandescent light bulb, a halogen light bulb having a higher color temperature has a higher light emission ratio at a wavelength of 400 nm or less than a light bulb for general lighting, but it may be an incandescent light bulb for general lighting.
[0064]
In the case of a discharge lamp, either a low pressure discharge lamp or a high pressure discharge lamp may be used.
[0065]
An example of the low-pressure discharge lamp is a fluorescent lamp. The phosphor used for the fluorescent lamp can be selected to appropriately increase the emission of 400 nm or less. Such a fluorescent lamp is suitable as a lamp for activating a photocatalyst because it has a relatively small decrease in visible light and has a better activation effect of the photocatalyst than a fluorescent lamp for general illumination. However, the present invention allows a fluorescent lamp using a three-wavelength-type phosphor or a calcium halophosphate phosphor that has been widely used for general illumination.
[0066]
In addition, germicidal lamps, black lights, chemical lamps, and the like for the purpose of mainly using light emission of 400 nm or less are allowed.
[0067]
On the other hand, as the high-pressure discharge lamp, for example, a mercury lamp, a metal halide lamp, a high-pressure sodium lamp and the like are allowed.
[0068]
The glass bulb may be an embodiment that surrounds the discharge medium, or an outer tube that further surrounds the arc tube containing the light emitting part.
[0069]
In the present invention, since the photocatalyst film is formed using the glass bulb of the lamp as a base, the photocatalyst film can be sufficiently activated even if the amount of emitted light of 400 nm or less generated by the lamp is small.
[0070]
In addition, when the lamp of the present invention is used, organic fat substances such as cigarette fat and soot and soot adhering to the glass bulb are decomposed by the photocatalytic action, so that a decrease in luminous flux due to dirt on the glass bulb is reduced. For this reason, while being able to perform favorable illumination over a long period of time, the cleaning interval of a lamp can be lengthened.
[0071]
Further, heat generated as the lamp is turned on generates heat convection around the lamp and convection of the room air. Deodorization and sterilization of the air in contact with the lamp is performed. Therefore, the indoor air can be deodorized and sterilized by using the lamp of the present invention.
[0072]
The lighting fixture according to claim 8 is a lighting fixture body provided with a light control means; and the photocatalyst body according to any one of claims 1 to 6, wherein at least a part of the light control means of the lighting fixture body is formed as a base. It is characterized by comprising.
[0073]
In the present invention, the luminaire may be either outdoor or indoor.
[0074]
The light control means is allowed to be used in one kind or a combination of any plural kinds such as a reflector, a globe, a shade, a translucent cover, and a louver.
[0075]
Further, the photocatalytic film may be formed on the entire light control means, or may be formed on a part thereof.
[0076]
The light control means, when dirt made of organic matter such as smoke or cigarette oil adheres to it, the optical performance as a lighting fixture is lowered, but the dirt is decomposed by forming a photocatalytic film. Therefore, it is possible to suppress a decrease in optical performance.
[0077]
Moreover, indoor deodorization and sterilization can also be performed by decomposing or sterilizing odorous substances in the air that come into contact with the light control means.
[0078]
Furthermore, it is possible to provide a deodorizing or sterilizing means by arranging the lighting fixture in such a size and structure that can be accommodated in, for example, a refrigerator, an air conditioner, an air cleaning device, or the like.
[0079]
As can be understood from the above description, since the photocatalytic film is formed on the light control means, it is preferable that the photocatalytic film has good transparency.
[0080]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0081]
FIG. 1 is an enlarged schematic cross-sectional view of a main part showing a cross section of a photocatalyst film in the first embodiment of the photocatalyst body of the present invention.
[0082]
In each figure, 1 is a substrate, 2 is an underlayer, and 3 is a photocatalytic film.
[0083]
The substrate 1 is made of soda lime glass.
[0084]
The underlayer 2 is formed by mixing aluminum oxide fine particles in a molar ratio of 80:20, and is transparent and porous, and the surface is formed on an uneven surface 2a having an average depth of about 30 nm. It is a film.
[0085]
The underlayer 2 is prepared by preparing a coating solution in which aluminum oxide fine particles 2b having an average particle diameter of about 15 nm are dispersed in a solution in which polysiloxane is dissolved in ethanol, coating the surface of the substrate 1, and drying. It is formed by firing at 150 ° C.
[0086]
The photocatalyst film 2 is formed by binding ultrafine particles of titanium oxide having an average particle diameter of about 7 nm on the underlayer 2. The photocatalyst film 3 enters the uneven surface 2 a formed on the surface of the underlayer 2, and a very small amount of ultrafine particles permeates the underlayer 2 and is in close contact with the underlayer 2. Although not shown here, the cross section of the photocatalyst of the present embodiment was observed with a micrograph, and it was confirmed that the ultrafine particles of titanium oxide soaked into the vicinity of the base 1 of the underlayer 2.
[0087]
FIG. 2 is a graph showing the spectral transmittance characteristics of the photocatalyst film in the first embodiment of the photocatalyst of the present invention.
[0088]
In the figure, the horizontal axis represents wavelength (nm), and the vertical axis represents transmittance (%).
[0089]
The curve shows the spectral transmittance characteristics of the photocatalytic film according to the present embodiment.
[0090]
As is apparent from the figure, according to the present embodiment, the transmittance is improved in the visible light and the ultraviolet region.
[0091]
FIG. 3 is a graph showing the measurement results of the ink decomposability in the first embodiment of the photocatalyst of the present invention.
[0092]
In the figure, the horizontal axis indicates the elapsed time (minutes), and the vertical axis indicates the relative value of decomposability.
[0093]
The curve indicates the decomposability of the ink according to the present embodiment.
[0094]
As can be seen from the figure, according to the present embodiment, the photocatalytic action is excellent.
[0095]
FIG. 4 is a cross-sectional front view of an essential part showing a fluorescent lamp in one embodiment of the lamp of the present invention. In the figure, 11 is a glass bulb, 12 is a photocatalytic film, 13 is a phosphor layer, 14 is a filament electrode, and 15 is a base.
[0096]
The glass bulb 11 functions as a base with respect to the photocatalyst film 12 and houses therein a functional part as a fluorescent lamp in an airtight manner. That is, several torr of rare gas mainly composed of mercury and argon as a discharge medium is sealed inside the glass bulb 11, the phosphor layer 13 is supported on the inner surface, and a pair of filament electrodes 14 are sealed at both ends. .
[0097]
The base 15 is composed of an aluminum cap-shaped base body 15 a and a pair of base pins 15 b that are insulated and attached to the base body 15 a, and are bonded to both ends of the glass bulb 11. Both ends of the filament electrode 14 are connected to the cap pin 15b.
[0098]
Then, when the fluorescent lamp of the present embodiment is used for illumination, the organic catalyst adhered to the surface of the fluorescent lamp is decomposed by the photocatalytic action of the photocatalytic film 12, and the odorous substance in the contacted air is decomposed. Deodorizing the surroundings.
[0099]
FIG. 5 is a perspective view showing a tunnel lighting device according to an embodiment of the lighting device of the present invention.
[0100]
In the figure, 21 is a luminaire body, 22 is a front frame, 23 is a translucent glass cover, 24 is a lamp socket, 25 is a high-pressure discharge lamp, and 26 is a reflector.
[0101]
The luminaire main body 21 is formed by forming a stainless steel plate into a box shape having an opening on the front surface, and includes a mounting bracket 21a on the back surface.
[0102]
The front frame 22 is formed of a stainless steel plate, and includes a light projection opening 22a at the center, a hinge 22b on one side, and a latch (not shown) on the other side. The hinge 2a is pivotally attached to one side of the front side of the luminaire main body 21 so as to be freely opened and closed, and is fixed at the closed position by a latch.
[0103]
The translucent glass cover 23 is waterproofly attached to the front frame 22 via a silicone rubber packing 2a. The translucent glass cover 23 transmits visible light and has a relatively high transmittance characteristic in at least a part of the ultraviolet region having a wavelength of 400 nm or less. Further, the photocatalytic film shown in FIG. 1 is formed on the front surface of the translucent glass cover 23.
[0104]
The lamp socket 24 is disposed in the lighting fixture body 21.
[0105]
The high-pressure discharge lamp 25 emits ultraviolet rays having an intensity of 0.05 W or more per 1000 lm of visible light within a wavelength range of 340 to 400 nm.
[0106]
The reflector 26 is disposed in the luminaire main body 21, and is configured and arranged so that the light emitted from the high-pressure discharge lamp 25 is reflected by the reflector 26 and exhibits a required light distribution characteristic. Yes.
[0107]
A ballast, a terminal block, and the like are disposed on the back side of the reflector 26 of the lighting fixture body 21.
[0108]
And the lighting fixture of this embodiment is installed in a tunnel via the attachment bracket 21a, is used, and illuminates the inside of a tunnel.
[0109]
Further, since ultraviolet rays mainly in the wavelength range of 340 to 400 nm radiated from the high-pressure discharge lamp 25 simultaneously with the illumination pass through the translucent glass cover 23 together with visible light and enter the photocatalyst film, the photocatalyst film is made of ultraviolet rays. The self-cleaning is performed by decomposing organic matter such as soot and smoke activated by the
[0110]
【The invention's effect】
According to the photocatalyst body of claims 1 to 6, the film formability and wettability of the photocatalyst film can be improved, the film strength can be increased, and the UV absorption of the underlayer is small, so the photocatalyst film It is possible to increase the photocatalytic effect by increasing the UV utilization efficiency.
[0111]
According to the lamp of the seventh aspect, the lamp having the effects of the first to sixth aspects can be provided.
[0112]
According to the lighting fixture of Claim 8, the lighting fixture which has the effect of Claims 1 thru | or 6 can be provided.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part of a conceptual diagram showing a cross section of a photocatalyst film in the first embodiment of the photocatalyst body of the present invention. FIG. 2 is a spectral transmittance of the photocatalyst film in the first embodiment of the photocatalyst body of the present invention. Fig. 3 is a graph showing characteristics. Fig. 3 is a graph showing measurement results of ink decomposability in the first embodiment of the photocatalyst of the present invention. Fig. 4 is a main portion showing a fluorescent lamp in one embodiment of the lamp of the present invention. Cross-sectional front view [FIG. 5] A perspective view showing a tunnel lighting fixture in one embodiment of the lighting fixture of the present invention [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base | substrate, 2 ... Underlayer, 2a ... Uneven surface, 2b ... Fine oxide particle, 3 ... Photocatalyst film.

Claims (8)

A substrate;
The layer is composed mainly of at least one oxide fine particle selected from the group consisting of aluminum, zirconium, and silicon and polysiloxane , the average particle size of the oxide fine particle is 10 to 60 nm, and the oxidation in the layer An underlayer formed on the substrate so that the molar ratio of the fine particles is 40 to 90%;
Mainly composed of titanium oxide ultrafine particles having an average particle size smaller than the oxide fine particles, the surface of the underlayer has a depth equal to or greater than the average particle size of the oxide fine particles between the oxide particles of the underlayer. A photocatalytic film formed by entering ;
The photocatalyst body characterized by comprising.   The photocatalyst body according to claim 1, wherein the average particle diameter of the titanium oxide ultrafine particles of the photocatalyst film is 4 to 10 nm.   The photocatalyst according to claim 1 or 2, wherein the composite layer composed of the underlayer and the photocatalyst film has an average linear light transmittance of 90% or more for visible light.   The photocatalyst according to any one of claims 1 to 3, wherein the titanium oxide ultrafine particles of the photocatalyst film are mainly composed of anatase crystals.   4. The photocatalyst according to claim 1, wherein the ultrafine particles of titanium oxide in the photocatalyst film are a mixture of anatase crystals and rutile crystals. The ultrafine particles of titanium oxide in the photocatalyst film penetrate between the fine oxide particles in the underlayer at a depth equal to or greater than the average particle size of the underlayer fine particles and soak into the underlayer . The photocatalyst according to any one of claims 1 to 5 , wherein the abundance ratio of the titanium oxide ultrafine particles increases and the refractive index of the underlayer continuously changes toward the surface side . A lamp body that emits light including light having a wavelength of 400 nm or less, in which a light bulb is surrounded by a glass bulb;
The photocatalyst body according to any one of claims 1 to 6, wherein the photocatalyst body is attached to at least an outer surface of the glass bulb as a base;
The lamp characterized by comprising. A luminaire body provided with light control means;
The photocatalyst body according to any one of claims 1 to 6, wherein the photocatalyst body is formed using at least a part of the light control means of the luminaire body as a base;
The lighting fixture characterized by comprising.

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