Photo-catalyst-carried floodlight

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to an illuminating lamp having a light emitting portion inside a heat-resistant container and carrying a photocatalyst having effects such as deodorization, sterilization, and antifouling.

【0002】

[Conventional technology]

Titanium oxide, an n-type semiconductor, is known as a photocatalyst that promotes various chemical reactions such as deodorization, sterilization, decomposition of organic substances, purification of water, and wastewater treatment by the energy of ultraviolet rays. Various methods of supporting a photocatalyst on a glass plate, a tube, or a glass fiber have been proposed (Japanese Patent Laid-Open No. 62-66861, Japanese Patent Application Laid-Open No. 5-309267, EP633064, US4888101). However, there are problems that the catalytic activity tends to decrease, the durability is insufficient, the light transmittance of the supported photocatalyst is insufficient, and the manufacturing cost is very high.

【0003】

[Problems to be Solved by the Invention]

The problems that must be solved in order to support the photocatalyst on the surface of the container of the illumination lamp are that the adhesion between the photocatalyst and the surface substrate of the illumination lamp is good, and that the photocatalytic activity is supported on the substrate of the illumination lamp container. As a result, the light transmittance is not lowered by supporting the photocatalyst, the adhesive layer is not deteriorated by the supported photocatalyst, and the strength is maintained for a long period of time and the durability is maintained.

【0004】

[Means for solving problems]

The illumination lamp carrying the photocatalyst according to the present invention has a structure in which an adhesive layer is provided between the photocatalyst layer and the surface of the illumination lamp substrate, and the adhesive layer is a silicon-modified resin or poly having a silicon content of 2 to 60% by weight. A resin containing 3 to 60% by weight of siloxane or a resin containing 5 to 40% by weight of colloidal silica, and the photocatalyst layer is a photocatalyst containing 25 to 95% by weight of a metal oxide gel or a metal hydroxide gel. It is characterized by being a complex.

【0005】

The adhesive layer provided between the photocatalyst layer and the surface of the illuminating lamp substrate has a function of firmly adhering the photocatalyst layer to the surface of the substrate, and has a feature that the adhesive layer itself is not easily deteriorated by the photocatalytic action. doing.

【0006】

Examples of the resin used as the adhesive layer include acrylic resin, acrylic-silicon resin, silicon-modified resin, urethane resin, epoxy resin, polyester resin, alkyd resin, etc., in which silicon, polysiloxane, or colloidal silica is introduced by a commonly used method. However, silicon-modified resins containing acrylic-silicon resin and epoxy-silicon resin are the most excellent in terms of durability.

【0007】

BEST MODE FOR CARRYING OUT THE INVENTION

As the material of the adhesive in the present invention, a silicon-modified resin such as acrylic-silicon resin or epoxy-silicon resin having a silicon content of 2 to 60% by weight, a resin containing 3 to 60% by weight of polysiloxane, or colloidal silica may be used. A resin containing 5 to 40% by weight is suitable because it firmly adheres the photocatalyst and the adhesive layer itself is less deteriorated by the photocatalyst. Silicon-modified resins such as acrylic-silicon resin and epoxy-silicon resin with a silicon content of less than 2% by weight, resins with a polysiloxane content of less than 3% by weight, or resins with a colloidal silica content of less than 5% by weight , The adhesion with the photocatalyst layer becomes poor, and the adhesive layer is easily deteriorated by the photocatalyst, and the photocatalyst layer is easily peeled off. Silicon-modified resins such as acrylic-silicon resin and epoxy-silicon resin with a silicon content of more than 60% by weight have poor adhesion between the adhesive layer and the substrate, and poor wear resistance due to the reduced hardness of the adhesive layer. Become. With a resin having a polysiloxane content of more than 60% by weight or a resin having a colloidal silica content of more than 40% by weight, the adhesive layer becomes porous or the adhesiveness between the substrate and the adhesive layer deteriorates. The photocatalyst is easier to peel off than the substrate.

【0008】

When the adhesive layer resin is a silicon-modified resin such as acrylic-silicon resin or epoxy-silicon resin, the method of introducing silicon into the resin is ester exchange reaction, graft reaction using silicon macromer or reactive silicon monomer, hydrosilylation. There are various methods such as reaction and block copolymerization, but any method can be used. Acrylic resin and epoxy resin are the most excellent resins for introducing silicon in terms of film formation, toughness, and adhesion to carriers, but any resin such as alkyd resin, urethane resin, and polyester resin can be used. it can. These resins can be used in either solvent-soluble or emulsion types. There is no problem even if an additive such as a cross-linking agent is contained.

【0009】

When the adhesive layer resin contains polysiloxane, adhesiveness and durability when the polysiloxane is a hydrolyzate of silicon alkoxide having an alkoxy group having 1 to 5 carbon atoms or a product produced from the hydrolyzate. An illuminator carrying a more improved photocatalyst can be obtained. When the number of carbon atoms in the alkoxy group of the silicon alkoxide exceeds 6, it is expensive and the hydrolysis rate is very slow, so that it becomes difficult to cure in the resin, and the adhesiveness and durability deteriorate. It is possible to use a polysiloxane obtained by hydrolyzing a silicon alkoxide partially containing chlorine, but if a polysiloxane containing a large amount of chlorine is used, the photocatalytic activity may be reduced due to the chlorine ions of impurities, or the adhesiveness may be reduced. Make it worse. As a method of introducing polysiloxane into a resin, a method of mixing a silicon alkoxide monomer with a resin solution and hydrolyzing it with water in the air at the time of forming an adhesive layer, or a method of partially hydrolyzing silicon alkoxide in advance with a resin is used. There are various methods such as mixing and further hydrolyzing with water in the air when forming the adhesive layer, but any method can be used as long as it can be uniformly mixed with the resin. Further, in order to change the hydrolysis rate of the silicon alkoxide, a small amount of acid or base catalyst may be added. As the resin into which polysiloxane is introduced, any resin such as acrylic resin, acrylic-silicon resin, epoxy-silicon resin, silicon-modified resin, urethane resin, epoxy resin, polyester resin, and alkyd resin can be used, but acrylic-silicon can be used. Silicon-modified resins, including resins and epoxy-silicon resins, are the best in terms of durability.

【0010】

When the adhesive layer is a resin containing colloidal silica, the particle size of the colloidal silica is preferably 10 nanometers or less. When it becomes 10 nanometers or more, not only the resin in the adhesive layer is easily deteriorated by the photocatalyst, but also the adhesiveness between the photocatalyst layer and the adhesive layer is deteriorated. The simplest method for introducing this colloidal silica into the resin is to mix the resin solution and the colloidal silica solution, and then apply and dry to form a protective film. However, the resin is introduced in a state where the colloidal silica is dispersed. A polymerized and synthesized product may be used. In order to improve the adhesiveness and dispersibility between the colloidal silica and the resin, the colloidal silica may be treated with a silane coupling agent before use. As the resin into which colloidal silica is introduced, any resin such as acrylic resin, acrylic-silicon resin, epoxy-silicon resin, silicon-modified resin, urethane resin, epoxy resin, polyester resin, and alkyd resin can be used, but acrylic-silicon can be used. Silicon-modified resins, including resins and epoxy-silicon resins, are the most durable. The colloidal silica can be any material, whether it is a silica sol made by cation exchange of a sodium silicate solution or a silica sol made by hydrolyzing silicon alkoxide.

【0011】

Durability can be improved by mixing a light stabilizer and / or an ultraviolet absorber or the like with the adhesive layer resin for the purpose of suppressing deterioration due to photocatalytic action. As a light stabilizer that can be used, a hindered amine type is preferable, but other light stabilizers can also be used. As the ultraviolet absorber, a triazole type or the like can be used. The amount added is 0.005 wt% or more and 10 wt% or less, preferably 0.01 wt% or more and 5 wt% or less with respect to the resin. Further, if the adhesive layer is treated with a silane-based or titanium-based coupling agent, the adhesiveness with the photocatalyst layer may be improved.

【0012】

As a method of coating the adhesive layer on the substrate surface of the fluorescent lamp, a method of coating and drying the resin solution by a printing method, a sheet forming method, a spray spraying method, a dip coating method, a spin coating method or the like can be used. The drying temperature varies depending on the type of solvent and resin, but is generally preferably 150 ° C or lower. By setting the thickness of the adhesive layer to 0.5 μm or more and 20 μm or less, it is possible to satisfy the characteristics required for the adhesive layer, that is, the photocatalyst layer is firmly adhered and the adhesive layer is resistant to deterioration due to the photocatalyst.

【0013】

The metal oxide gel or metal hydroxide gel in the photocatalyst layer not only adheres the photocatalyst powder and firmly adheres to the adhesive layer, but also has adsorptivity because the gel is porous, and has photocatalytic activity. It also has the effect of increasing. The content of the metal oxide gel or the metal hydroxide gel in the photocatalyst layer is preferably 25 to 95% by weight. If it is 25% by weight or less, the adhesion to the adhesive layer is insufficient, and if it is 95% by weight or more, the photocatalytic activity is insufficient. In addition, the specific surface area of the metal oxide gel or metal hydroxide gel is 100 m.²When it is more than / g, the adhesiveness becomes stronger and the catalytic activity also improves. As the material, an oxide gel or a hydroxide gel of a metal of silicon, aluminum, titanium, zirconium, magnesium, niobium, tantalum, or tungsten is preferable. Further, a gel in which these are mixed may be used, or a composite oxide gel prepared by a method such as a coprecipitation method may be used. In order to mix with the photocatalyst, it is desirable to mix in the state of the sol before forming a gel, or at the stage of the raw material before preparing the sol. Methods for preparing the gel include a method of hydrolyzing a metal salt, a method of neutralizing and decomposing, a method of ion exchange, a method of hydrolyzing a metal alkoxide, and the like. The photocatalyst powder is uniformly dispersed in the gel. Any method can be used as long as it can be obtained in a state of being. However, the presence of a large amount of impurities in the gel adversely affects the adhesiveness and catalytic activity of the photocatalyst, so a gel having few impurities is preferable. In particular, the presence of 5% or more of organic matter in the gel reduces the photocatalytic activity.

【0014】

As a photocatalyst in the photocatalyst layer, TiO₂, ZnO, SrTiO₃, CdS, GaP, InP, GaAs, BaTiO₃, K₂NbO₃, Fe₂O₃, Ta₂O₅, WO₃, SnO₂, Bi₂O₃, NiO, Cu₂O, SiC, SiO₂, MoS₂, InPb, RuO₂, CeO₂, Etc. and to these photocatalysts Pt, Rh, RuO₂, Nb, Cu, Sn, NiO and other known metals and metal oxides added can all be used. As for the content of the photocatalyst in the photocatalyst layer, the larger the amount, the higher the catalytic activity, but from the viewpoint of adhesiveness, it is preferably 75% by weight or less.

【0015】

In order to form the photocatalyst layer on the adhesive layer, a suspension in which the photocatalyst is dispersed in a metal oxide sol or a metal hydroxide sol solution can be coated by a coating method similar to that for forming the adhesive layer. .. The photocatalyst may be dispersed in the state of a metal oxide sol or a precursor solution of a metal hydroxide sol, and hydrolyzed or neutralized and decomposed at the time of coating to form a sol or gel. When a sol is used, an acid or alkaline gelatinizing agent or the like may be added for stabilization. Further, it is also possible to add 5% by weight or less of a surfactant, a silane coupling agent, or the like to the photocatalyst in the sol suspension to improve the adhesiveness and operability. The drying temperature at the time of forming the photocatalyst layer varies depending on the carrier material and the resin material in the adhesive layer, but is preferably 50 ° C or higher and 200 ° C or lower.

【0016】

The thickness of the photocatalyst layer should be 0.1 μm or more and 20 μm or less, and the photocatalyst particles with a crystal particle size of 40 nm or less and the specific surface area of 100 m.²When a metal oxide gel or a metal hydroxide gel of / g or more is used, the photocatalytic activity is sufficiently sufficient for practical use, and the total light transmittance of the photocatalytic layer and the adhesive layer at a wavelength of 550 nm is 70% or more.

【0017】

A lighting lamp provided with an adhesive layer and a photocatalyst layer on the surface of the base container of the lighting lamp can absorb harmful ultraviolet rays on the surface of the container and prevent the light emission to the outside. Further, in the case of a fluorescent lamp, it has been customary to add an ultraviolet absorber to a fluorescent substance applied in a container, but such measures are not required. The carrier provided with the adhesive layer and the photocatalyst layer of the present invention has an ultraviolet intensity of 3 mW / cm.²Even after irradiating with the light of the black light fluorescent lamp at a temperature of 40 ° C and a relative humidity of 90% for 500 hours, the adhesion by the grid tape method of JIS K 5400 maintains an evaluation score of 6 points or more. You can also make something that shows high durability.

【0018】

White fluorescent lamps for general lighting are usually considered to prevent the output of ultraviolet rays as much as possible, but a small amount of near-ultraviolet rays causing the photocatalytic action of titanium oxide is emitted. (See Fig. 1) In addition, the black light (BLB fluorescent lamp, see Fig. 2), which emits a large amount of near-ultraviolet rays, emits a large amount of near-ultraviolet rays of 365 nm as shown in the figure. Furthermore, incandescent light bulbs, which are often used for general lighting, do not use mercury discharge at all, but emit light containing near-ultraviolet rays centered on 365 nm, and depending on the type of product, white fluorescent lamps. Some emit more near-ultraviolet light than this. Supporting the photocatalyst according to the present invention on the surface of the substrate of a container for an illuminating lamp that emits near-ultraviolet rays is considered from the viewpoints of effective utilization of the emitted ultraviolet rays for the photocatalytic action and prevention of emission of emitted ultraviolet light. It can be said that the merit is very large.

【0019】

Further, it is desirable that the lighting lamp that can be used in the present invention has a surface temperature of 200 ° C. or less when it is lit. Halogen lamps with a container substrate surface temperature of 200 ° C or higher are not preferable because the resin used for the adhesive layer deteriorates. As long as the surface temperature of the container base of the lighting lamp is 200 ° C. or less when lit, it can be applied to any of general incandescent lamps, fluorescent lamps, bulb-type fluorescent lamps, and various other lighting lamps. The lighting lamp of the present invention efficiently decomposes oil stains adhering to the surface and oils and fats such as tobacco tar by the light of the lighting lamp itself, and easily removes a trace amount of malodorous components and floating germs contained in the indoor space. Since it has the effect of disassembling and killing, it has a wide range of applications such as hospitals, clinics, nursing homes, hotels, offices, food factories and other places that require cleanliness, trains and other vehicles, subway homes and tunnels, and road lighting. Can be used for.

【0020】

[Example]

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples.

【0021】

Example 1 Incandescent light bulb Polysiloxane (methyl silicate 51 manufactured by Corcote Co., Ltd.) is mixed with 30% by weight of acrylic silicone resin in a xylene solution containing 20% by weight of acrylic silicone resin with a silicon content of 20% by weight, and used as a solid content in an isopropanol solution. White ball GW100V100WG125 type manufactured by Toshiba Litec Co., Ltd. was immersed in a solution diluted to 20% by weight, pulled up and dried at 100 ° C. for 120 minutes to form an adhesive layer. Next, in the light bulb on which this adhesive layer was formed, a nitrate acidic titania sol having a titanium oxide content of 20% by weight was dispersed as a photocatalytic layer in a nitrate acidic silica sol having a silicon oxide content of 20% in the presence of a surfactant to form ions. It was immersed in a solution diluted to an oxide concentration of 10% by weight with exchange water, pulled up, and similarly dried at 100 ° C. for 120 minutes to obtain a photocatalyst-coated bulb. (Sample.1) [0022]

Example 2 Straight tube fluorescent lamp FIG. 3 shows a schematic cross-sectional view of the fluorescent lamp according to the present embodiment, and FIG. 4 shows a conceptual diagram in which a part of the fluorescent lamp is omitted. In FIGS. 3 and 4, reference numeral 1 is a cylindrical glass bulb, the inner wall of the glass bulb is coated with the phosphor layer 4, and the outer surface is formed with the adhesive layer 3 and the photocatalyst layer 2. The discharge lamp of this embodiment is a straight tube type fluorescent lamp that emits light of three wavelengths, and a discharge lamp of FL40SS according to JIS standard. The fluorescent lamp was immersed in the adhesive layer solution used in Example 1, pulled up at a speed of 40 cm per minute, and dried at 120 ° C. for 30 minutes to obtain an adhesive layer. Next, the lamp was immersed in the photocatalyst layer solution used in Example 1, pulled up at a speed of 20 cm per minute, and dried at 120 ° C. for 30 minutes to obtain a photocatalyst-coated straight tube fluorescent lamp. (Sample.2) [0023]

Example 3 Circular fluorescent lamp FIG. 5 shows a front view of the annular fluorescent lamp according to this embodiment. The reference numerals have the same meanings as those in the second embodiment. In the case of this embodiment, the main tube is made of soda lime glass containing no lead component and has an annular shape. Polysiloxane (methyl silicate 51 manufactured by Corcote Co., Ltd.) is mixed with 30% by weight of acrylic silicone resin in a xylene solution containing 20% by weight of acrylic silicone resin with a silicon content of 30% by weight, and used as a solid content in an isopropanol solution. A white starter type fluorescent lamp FCL30W manufactured by Toshiba Litec Co., Ltd. was immersed in a solution diluted to 15% by weight, pulled up and dried at 100 ° C. for 120 minutes to form an adhesive layer. Next, the cyclic fluorescent lamp on which this adhesive layer was formed was allowed to cool at room temperature, and then a dispersion containing 16% by weight of titanium oxide (P-25) manufactured by Nippon Aerodil Co., Ltd. was added as a photocatalytic layer to a silicon oxide content of 16% by weight. Was dispersed in the nitric acid acidic silica sol of the above to prepare a coating solution for the photocatalyst layer. This solution was applied to the surface of the adhesive layer using a commercially available spray coating gun and dried at 100 ° C. for 120 minutes to obtain a photocatalyst-coated annular fluorescent lamp. (Sample.3) [0024]

Example 4 Curved tube fluorescent lamp FIG. 6 shows a perspective view in which a part of the curved tube type fluorescent lamp according to this embodiment is cut out. In the case of this embodiment, a light emitting portion bent in a substantially U shape and a base portion supporting the light emitting portion are provided. The fluorescent lamp was immersed in the adhesive layer solution used in Example 1, pulled up at a speed of 40 cm per minute, and dried at 120 ° C. for 120 minutes to obtain an adhesive layer. Next, the lamp was immersed in the photocatalyst layer solution used in Example 1, pulled up at a speed of 20 cm per minute, and dried at 100 ° C. for 120 minutes to obtain a photocatalyst-coated curved tube fluorescent lamp. (Sample.4) [0025]

Example 5 Blacklight Fluorescent Lamp The adhesive layer solution used in Example 1 was immersed in 6W type black light FL6BLB manufactured by Toshiba Lighting & Technology Corporation, pulled up at a speed of 20 cm per minute, and dried at 100 ° C. for 120 minutes to form an adhesive layer. Next, the black light on which this adhesive layer was formed was immersed in the photocatalyst layer solution used in Example 1, pulled up at a speed of 20 cm per minute, and dried at 100 ° C. for 120 minutes to obtain a photocatalyst-coated black light. (Sample.5) [0026]

Example 6 Light bulb type fluorescent lamp FIG. 7 shows a front view of the bulb-type fluorescent lamp according to this embodiment. The light bulb type fluorescent lamp device is provided with a base portion and a light emitting portion, the base portion is provided with a cover made of PBT resin as a light shielding portion, and a lighting circuit equipped with a ballast or the like is housed inside this cover. There is. On the other hand, the light emitting portion is provided with a transparent or translucent, substantially spherical glove having translucency, and a curved tube type fluorescent lamp is housed inside the glove. Further, a partition plate is provided between the base portion and the light emitting portion, a fluorescent lamp is attached to the light emitting portion side of the partition plate, and a position number having a lighting circuit is attached to the base portion side of the partition plate. Has been done. The adhesive layer solution used in Example 2 was applied to the outer surface of the container of a light bulb type fluorescent lamp (trade name: Neoball QT type BFT17EX-L / GQ / 6 type) manufactured by Toshiba Lighting & Technology Corporation, manufactured by Iwata Coating Machine Co., Ltd. It was spray-coated using a spray gun WIDER88 and dried at 100 ° C for 120 minutes to form an adhesive layer. Next, the photocatalyst layer solution used in Example 1 was spray-applied to the bulb-type fluorescent lamp on which this adhesive layer was formed in the same manner, and dried at 100 ° C. for 120 minutes to obtain a photocatalyst-coated bulb-type fluorescent lamp. (Sample.6) [0027]

When the fluorescent lamp shown in the above embodiment is turned on, mercury vapor emits ultraviolet rays due to arc discharge between the electrodes, and the ultraviolet rays excite the phosphor and emit visible light, and a part of the ultraviolet rays radiates the phosphor layer. It transmits and irradiates the photocatalyst layer. The photocatalytic layer is irradiated with ultraviolet rays to generate photocatalytic activity, and oxidizes and decomposes substances such as oil and fat components, dust and tobacco tar adhering to the outer surface to remove stains. In other words, this fluorescent lamp emits visible light as a light source for illumination and also emits a small amount of ultraviolet light, so this ultraviolet light is used to prevent dirt from adhering, resulting in a decrease in luminous flux and lighting efficiency. Functions as a small light source.

【0028】

<Evaluation of photocatalytic activity> Using the samples of Samples 1 to 6, the photocatalytic activity was evaluated as shown below, and the results shown in Table 1 were obtained.

【0029】

1) Total light transmittance Using the lighting lamp before supporting the adhesive layer and the photocatalyst layer as a reference, the illuminance of the visible light part of the lighting lamp of the same shape carrying the photocatalyst was measured with a digital illuminance meter, and the adhesive layer and the photocatalyst layer under the same measurement conditions. The degree of decrease in illuminance due to the support of The evaluation was made according to the following evaluation criteria based on the illuminance of the reference lighting. 95 ~ 100% A 85 ~ 95% B 70 ~ 85% C 50 ~ 70% D 50% or less E [0030]

2) Acetaldehyde decomposition activity Attach the luminaire to the lighting fixture, put it in a stainless steel airtight container with a length of 50 cm, a width of 50 cm, and a depth of 20 cm, insert the cord through a rubber stopper, and add a mixed gas of air and aldehyde to the aldehyde concentration of 100 ppm. Added to be. The acetaldehyde concentration after a predetermined time was measured by turning on the illumination lamp with a gas chromatograph equipped with a FID detector, and the photocatalytic activity was evaluated from the amount of decrease in the concentration after 2 hours. The evaluation criteria were as follows.<img file="JPH09171801A_D0001.tif" />【0031】

3) Linoleic acid decomposition activity (antifouling properties) A reagent-grade linoleic acid was applied to the surface of a lighting lamp carrying a photocatalyst using tissue paper in an amount of 0.1 mg / cm.²The lighting lamp prepared by applying the coating was turned on, and the weight change during lighting was weighed and recorded with a precision balance capable of measuring up to 0.1 mg. The evaluation was based on the weight residual ratio of the applied linoleic acid after 48 hours, and the evaluation criteria were as follows. Evaluation of linoleic acid residual rate after 48 hours of light irradiation 10% or less A 30 ~ 10% B 50 ~ 30% C 80 ~ 50% D 80% or more E [0032]

4) Antibacterial evaluation The surface of the container carrying the photocatalyst of the lighting lamp carrying the photocatalyst was cut to prepare a sample having a size of 2 to 3 cm square. The photocatalyst-supported surface of this sample is disinfected with 80% ethanol, dried at 150 ° C, sterilized, and then precultured and diluted in advance to increase the bacterial concentration to 10.⁵Drop 0.2 ml of Escherichia coli solution adjusted to individual / ml onto the sample surface and set in the incubator. Set four samples each under two types of light irradiation conditions: one that was irradiated with light from a white fluorescent lamp (15 W x 2 and a distance of 10 cm from the light source) and one that was not irradiated with light at all. After a predetermined time (1, 2, 3, 4 hours), take out the sample and wipe off the bacterial solution on the sample with sterile gauze soaked in sterile saline. Place the wiped sterile gauze in 10 ml of sterile saline and stir well. This supernatant bacterial solution is planted in an autoclave-sterilized 95 mmφ Petri dish agar medium, and the number of Escherichia coli colonies is counted after culturing at 36 ° C for 24 hours. Prepare a sample for measuring the number of reference bacteria with exactly the same operation before putting it in the incubator, inoculate the supernatant of sterile physiological saline on a Petri dish agar medium, and count the number of E. coli colonies after 24 hours culture. .. The survival rate of Escherichia coli after a predetermined time of each sample is calculated based on the numerical value. The evaluation was based on the residual rate of Escherichia coli in the sample irradiated with fluorescent light after 4 hours, and the evaluation criteria were as follows. Evaluation of E. coli survival rate after 4 hours 20% or less A 20-40% B 40-60% C 60-80% D 80% or more E [0033]

5) Adhesion evaluation Adhesion was evaluated by the grid tape method test specified in JIS K 5400. The cut spacing was set to 2 mm, and the number of stitches was set to 25. The evaluation points were based on the criteria described in JIS K 5400.

【0034】

6) Durability evaluation The surface of the container carrying the photocatalyst of the lighting lamp carrying the photocatalyst was cut to prepare a sample having a size of 2 to 3 cm square. UV intensity 3 mW / cm with black light on the sample carrying this photocatalyst²After irradiating the light in a constant temperature and humidity chamber with a temperature of 40 ° C and a relative humidity of 90% for 500 hours, the adhesiveness was measured by the grid tape method specified in JIS K 5400, and the durability was evaluated. The evaluation score is the same as the adhesiveness evaluation.

【0035】

[table 1]

<img file="JPH09171801A_D0002.tif" />【0036】

[Effect of the invention]

Lighting lamps carrying a highly durable photocatalyst that has high photocatalytic activity, high light transmission, and is resistant to deterioration are used for lighting in hospitals, offices, factories, roads, etc. for the purpose of antibacterial, deodorizing, antifouling, etc. It can be applied to a wide range of applications.

[Simple explanation of drawings]

[Figure 1]

Spectral energy distribution map of white fluorescent lamp [Figure 2]

Spectral energy distribution map of black light fluorescent lamp [Fig. 3]

Schematic diagram of a cross section of a fluorescent lamp carrying a photocatalyst according to Example 2. [Fig. 4]

Conceptual diagram in which a part of the fluorescent lamp according to the second embodiment is omitted. [Fig. 5]

Front view of the annular fluorescent lamp according to the third embodiment [Fig. 6]

Perspective view of the curved tube type fluorescent lamp according to the fourth embodiment with a part cut out. [Fig. 7]

Front view of the bulb-shaped fluorescent lamp according to the sixth embodiment [Explanation of symbols]

1 ... Glass tube container 2 ... Photocatalytic layer 3 ... Adhesive layer 4 ... Fluorescent layer