Constituent member for road auxiliary equipment carrying photocatalyzer and the road auxiliary equipment using the same

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a road incidental equipment constituent material having an organic matter decomposition activity by a photocatalytic action carrying a photocatalyst having an antifouling effect, and a road incidental equipment constituent material using the road incidental equipment constituent material.

【0002】

[Conventional technology]

Titanium oxide, an n-type semiconductor, is known as a photocatalyst that promotes various chemical reactions such as decomposition of organic substances by the energy of ultraviolet rays. Various methods for supporting the photocatalyst on glass, metal, plastic, tile, etc. have been proposed (Japanese Patent Laid-Open No. 62-66861, Japanese Patent Application Laid-Open No. 5-309267, EP633064, US49888101). However, the photocatalyst is supported on a polymethylmethacrylate resin plate, a polycarbonate resin plate, a painted steel plate, etc., which are widely used for substrates, with excellent adhesion and without deteriorating the photocatalytic activity, and the photocatalytic decomposition action is effectively utilized. As a result, no reports have been made on road ancillary equipment components that have maintained antifouling properties for a long period of time.

【0003】

[Problems to be Solved by the Invention]

The issues that must be solved when providing road accessory equipment components that support a photocatalyst are: 1. Good adhesion between the photocatalyst and the substrate, 2. Organic substance decomposition activity by the photocatalyst is supported on the substrate. 3. The substrate and adhesive layer do not deteriorate due to the supported photocatalyst, and the surface condition such as glossiness, color and transparency of the substrate and the adhesion of the photocatalyst are maintained for a long period of time to maintain durability. That is mentioned. In addition, in the case of road ancillary equipment using this road ancillary equipment constituent material, it is necessary to solve the following problems. Conventional road accessories installed outdoors, such as road signs, soundproof walls, through-hole sound insulation wallboards, guardrails, delineators or post cones, are prone to dust and soot in the outside air and are usually discolored and contaminated in 2 to 3 months. It had a big drawback that it spoiled the aesthetics and some of its functions. As a countermeasure, a method of coating the surface with a fluororesin has been considered, but as has been conventionally said, the fluororesin coating increases the water repellency of the surface and increases the lipophilicity, so that soot and the like are used. There was a drawback that the oil stains on the surface were more likely to adhere. In addition, titanium oxide originally has the property of developing hydrophilicity when irradiated with ultraviolet rays in the atmosphere, but by utilizing this effect, the surface of the outdoor installation structure is made hydrophilic and the attached oil mist A method for facilitating the washing of oils such as UV rays with water (particularly rainwater) has also been published (Japanese Patent Laid-Open No. 63-100042, WO 96/29375). These utilize the phenomenon that water easily gets wet on the surface by making the physical properties of the surface of the structure hydrophilic, and as a result, oil is lifted from the surface and flows down. However, with the method using the published technology, the decomposition action of the oil adhering to the surface by the photocatalyst is extremely low, so it can be used for practical use in roadside equipment where a large amount of dirt such as exhaust gas from diesel vehicles adheres firmly. There was a big problem of being constrained.

【0004】

[Means for solving problems]

The road accessory equipment component supporting the photocatalyst according to the present invention has a structure in which an adhesive layer is provided between the photocatalyst layer and the base material. The adhesive layer is a silicon-modified resin having a silicon content of 2 to 60% by weight, a resin containing 3 to 60% by weight of polysiloxane, or a resin containing 5 to 40% by weight of colloidal silica. The photocatalytic layer is a photocatalytic composite containing 25 to 95% by weight of a metal oxide gel or a metal hydroxide gel, and is characterized by having an organic matter decomposition activity by a photocatalytic action. The organic stains adhering to the surface of the photocatalyst layer are quickly decomposed by the photocatalytic action, and the remaining inorganic stains are not organic stains that act as an adhesive, so they are quickly washed away during rainfall. It has the ability to maintain antifouling properties for a long period of time. It is also possible to improve antibacterial and antifungal properties by adding a small amount of silver or copper to the photocatalyst layer.

【0005】

The adhesive layer provided between the photocatalyst layer and the base material has an action of firmly adhering the photocatalyst layer to the base material and an action of preventing deterioration of the base material due to the organic matter decomposition action of the photocatalyst, and also has an adhesive layer. It also has the characteristic that it is not easily deteriorated by the organic matter decomposition action of the photocatalyst.

【0006】

Examples of the resin used as the adhesive layer include acrylic resin, acrylic-silicon resin, epoxy-silicon resin, silicon-modified resin, urethane resin, and epoxy resin in which silicon, polysiloxane, or colloidal silica is introduced by a usual method. Polyester resin, epoxy resin, etc. can be used, but silicon-modified resin containing acrylic-silicon resin is 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. The resin contained in an amount of 5 to 40% by weight is suitable for firmly adhering the photocatalyst, preventing a decrease in photocatalytic activity due to the plasticizer component diffused from the base material, and protecting the base material from oxidative decomposition 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 Adhesion with the photocatalyst layer becomes poor, and the adhesive layer is 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 base material, and the hardness of the adhesive layer is reduced, resulting in poor wear resistance. become worse. 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 and the adhesiveness between the base material and the adhesive layer deteriorates. , The photocatalyst is easier to peel off than the base material.

【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, the 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. However, it is possible to obtain a road accessory component component that carries a more improved photocatalyst. 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 that partially contains chlorine, but if a polysiloxane containing a large amount of chlorine is used, the carrier may be corroded by the chlorine ions of impurities, or the adhesiveness may be improved. Make it worse. As a method of introducing the polysiloxane into the resin, a method of mixing the silicon alkoxide monomer with the resin solution and hydrolyzing it with the moisture in the air at the time of forming the adhesive layer, and a method of partially hydrolyzing the silicon alkoxide in advance with the resin. There are various methods such as mixing and further hydrolyzing with moisture 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 nm or less. At 10 nm or more, not only the resin in the adhesive layer is easily deteriorated by the photocatalyst, but also the adhesion 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. By adding 0.00001% by weight to 0.1% by weight of a surfactant in the solution of the adhesive layer, a good photocatalyst-supported road incidental equipment component can be obtained.

【0012】

As a method of applying the adhesive layer to the base material, a method of coating and drying the resin solution by a printing method, a flow coating 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 coating method, the solvent, and the type of resin of the base material, but is generally preferably 150 ° C or less. The thickness of the adhesive layer is preferably 0.5 μm or more and 5 μm or less. If it is less than 0.5 μm, the adhesive performance is insufficient, and if it exceeds 5 μm, it takes time to dry.

【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 due to the porous gel, 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. In particular, when a photocatalytic layer containing an oxide sol of zirconium or aluminum is used, it can pass the tape peeling test after a 15-minute boiling water resistance test in tap water, or it can be placed in a 5% sodium carbonate aqueous solution for 24 hours. Since a product that passes the tape peeling test after the immersion test can be obtained, it can be used particularly preferably.

【0014】

As a photocatalyst in the photocatalyst layer, ... (Please check only the subscript part here) ... 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. In order to further improve the antibacterial property and the antifungal property, it is also preferable to add 0.05 to 5% by weight of silver or copper metal or metal compound to the titanium oxide photocatalyst in the photocatalyst layer. If the amount added is 0.05% by weight or less, the effect of improving the antifungal property is poor, and if it is 5% by weight or more, the photocatalyst layer may be discolored, which may make it difficult to use.

【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 coating method, the material of the base material, and the resin material in the adhesive layer, but is generally preferably 150 ° C. or lower.

【0016】

The thicker the photocatalyst layer, the higher the activity, but when it is 5 μm or more, there is almost no change. Even if it is 5 μm or less, it exhibits high catalytic activity and also exhibits translucency, and the catalyst layer becomes inconspicuous, which is preferable. However, when the thickness is 0.1 μm or less, the translucency is improved, but the ultraviolet rays used by the photocatalyst are also transmitted, so that high activity cannot be expected. The thickness of the photocatalyst layer should be 0.1 μm or more and 5 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 metal hydroxide gel of / g or more is used, it has high photocatalytic activity and does not impair the texture of the underlying substrate, which is useful in terms of aesthetics.

【0017】

The base material provided with the adhesive layer and photocatalyst layer has an ultraviolet intensity of 3 mW / cm.²Even after irradiating with the black light of No. 4 for 2000 hours at a temperature of 40 ° C and a relative humidity of 90%, the adhesion by the grid tape method of JIS K 5400 is high enough to maintain an evaluation score of 6 points or more. You can also make something that shows durability.

【0018】

As the base material on which the adhesive layer and the photocatalyst layer are provided, plated steel sheets such as widely used polymethylmethacrylate resin plates, polycarbonate resin plates, various coated steel sheets, and galvanized steel sheets are targeted. Examples of road ancillary equipment constructed by using this base material include various road signs, soundproof walls installed on the side of the road, translucent sound insulation wallboards, guardrails, delineators, post cones, and the like. Such road ancillary equipment is extremely contaminated by exhaust gas from diesel vehicles and the like, but the road ancillary equipment supporting the adhesive layer and the photocatalytic layer according to the present invention has excellent photocatalytic decomposition characteristics. Therefore, it shows a remarkable antifouling effect even in a place where the exhaust gas pollution load is heavy, and it is very valuable from the viewpoint of maintaining the aesthetic appearance and reducing the cleaning burden.

【0019】

[Example]

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples. FIG. 1 is a schematic diagram of road ancillary equipment components. 1 is a photocatalyst layer, 2 is an adhesive layer, and 3 is a base material. The photocatalyst layer 1 is supported on the surface of the base material 3 by the adhesive layer 2 applied to the surface of the base material 3 and does not peel off. Further, of the organic substances contained in the exhaust gas adhering to the surface of the photocatalyst layer 1, the portion in contact with the photocatalyst surface is decomposed by the photocatalytic action when the photocatalyst layer 1 is exposed to light rays and loses its adhesiveness, so that it is washed away by rainwater. It will be easier. Figures 2 to 7 show road-related equipment constructed using road-related equipment components, respectively. FIG. 2 shows a road sign 11, and FIG. 3 shows a soundproof wall 12 having a sound absorbing material 13. FIG. 4 shows the light projection sound insulation wall plate 14, FIG. 5 shows the guardrail 15, FIG. 6 shows the delineator 16, and FIG. 7 shows the post cone 17. In either case, organic substances contained in the exhaust gas adhere to the outer surface of the photocatalyst layer 1, but when the photocatalyst layer 1 is exposed to light rays, it is decomposed by the photocatalytic action and loses its adhesiveness, so that it is easily washed away by rainwater.

【0020】

Experimental Example 1 Photocatalyst-supported polycarbonate resin plate translucent sound insulation wall plate Polycarbonate resin plate made by Cylinder Plastic Co., Ltd. Polycaace ECK100 Transparent clear 3 mm thick is cut out to A4 size, and poly is added to an ethanol / ethyl acetate (80/20) solution containing 10% by weight of acrylic-silicone resin with a silicon content of 3% by weight. A solution prepared by adding 30% by weight of siloxane (methyl silicate 51 manufactured by Colcoat Co., Ltd.) to acrylic-silicon resin together with a surfactant was applied with a No. 7 bar coater and applied at 100 ° C for 30 minutes. It was dried to form an adhesive layer. After allowing to cool at room temperature, a titania / silica molar ratio of 50/50 in the presence of a surfactant is placed in a nitrate-acid titania sol having a titanium oxide content of 5% by weight as a photocatalytic layer in a nitrate-acid silica sol having a silicon oxide content of 5% by weight. The photocatalyst layer was used as a coating solution. Using this solution, it was also applied to the surface of the adhesive layer with a No. 7 bar coater, and dried at 100 ° C. for 30 minutes to prepare a photocatalyst-supported sample. (Sample 1.) [0021] [0021]

Experimental Example 2 Photocatalyst-supported polymethylmethacrylate resin plate translucent sound insulation wall plate Asahi Kasei Co., Ltd. Polymethylmethacrylate resin Delagrass A No.9993 mm thick was cut out to A4 size, and the solution of the adhesive layer prepared by the same method as in Example 1 was applied with a bar coater of No.7 at 60 ° C. It was dried for 30 minutes to form an adhesive layer. After allowing to cool at room temperature, the solution of the photocatalyst layer prepared in the same manner as in Example 1 was applied to the surface of the adhesive layer with the same No. 7 bar coater, and dried at 60 ° C. for 30 minutes to prepare a photocatalyst-supported sample. did. (Sample 2.) [0022]

Experimental example 3 Sound insulation wall sample by dip application method The same polycarbonate resin plate as in Example 1 was cut into A4 size, and polysiloxane (methyl manufactured by Corcote Co., Ltd.) was added to an ethanol / ethyl acetate (70/30) solution containing 10% by weight of acrylic-silicone resin having a silicon content of 3% by weight. Using a solution prepared by adding and mixing 20% by weight of silicate 51) with acrylic-silicon resin together with a surfactant, the adhesive layer was formed by slowly pulling up at a pulling speed of 20 cm / min by the dipping method. It was dried at 100 ° C for 20 minutes. After allowing to cool at room temperature, use a solution in which nitrate-acidic titania sol with a titanium oxide content of 5% is dispersed in a nitrate-acidic silica sol with a silicon oxide content of 5% in the presence of a surfactant to prepare a coating solution for the photocatalyst layer. Then, the photocatalyst layer was applied to the surface of the adhesive layer by the same dipping method, and dried at 100 ° C. for 20 minutes to prepare a photocatalyst-supported sample. (Sample 3.) [0023]

Experimental Example 4 Copper-added photocatalyst-supported light-transmitting sound insulation wall plate The polymethylmethacrylate resin plate used in Example 2 was cut into A4 size, and polysiloxane (Colcoat Co., Ltd.) was added to an ethanol / ethyl acetate (80/20) solution containing 10% by weight of acrylic-silicone resin having a silicon content of 3% by weight. ) Methyl silicate 51) was added and mixed with 20% by weight of acrylic-silicon resin together with a surfactant to form an adhesive layer in the same manner as in Example 1 to form an adhesive layer at 60 ° C. Dry in C for 20 minutes. After allowing to cool at room temperature, copper nitrate hydrate was added to the photocatalytic layer in a solution containing 5% by weight titanium oxide titania sol and 5% by weight silicon oxide nitrate acidic silica sol, and 0.1% by weight based on titanium oxide. It was added and dispersed in the presence of a surfactant to prepare a coating solution for the photocatalyst layer. Using this solution, a photocatalyst layer was applied to the surface of the adhesive layer by the same method as in Example 1, and dried at 60 ° C. for 20 minutes to prepare a photocatalyst-supported sample. (Sample 4.) [0024]

Experimental example 5 Coating with a flow coater A 1 m x 2 m square of the same polycarbonate resin plate used in Example 1 was set in the flow coater, and ethanol / ethyl acetate (80/20) containing 10% by weight of acrylic-silicon resin with a silicon content of 3% by weight was set. ) Using a solution prepared by adding and mixing 20% by weight of polysiloxane (Methylsilicate 51 manufactured by Corcote Co., Ltd.) with acrylic-silicon resin together with a surfactant, the film formation rate is 10 m / min. A film was formed at a drying temperature of 100 ° C. After drying, a nitrate acidic titania sol having a titanium oxide content of 5% is dispersed as a photocatalyst layer in a nitrate acidic silica sol having a silicon oxide content of 5% in the presence of a surfactant, and the same flow is performed using the coating solution of the photocatalyst layer. The film was set on a coater and formed at a film formation rate of 10 m / min and a drying temperature of 100 ° C to prepare a photocatalyst-supported sample. (Sample 5.) [0025]

Comparative example 1 The same polymethylmethacrylate resin plate used in Example 2 was cut out to A4 size, and the photocatalytic activity was examined by the same method as in Samples 1 to 5 above by the method described below, and the results are shown in Table 1.

【0026】

<Evaluation of photocatalytic activity> Using the samples of Samples 1 to 5 and the samples of the comparative examples, the photocatalytic activity was evaluated as shown below, and the results shown in Table 1 were obtained.

【0027】

1) Contamination resistance (antifouling characteristics) A sample cut into a 20 cm x 15 cm square was attached to a fence facing a general road (truck traffic of about 500 to 1000 vehicles / day) together with a blank sample of the same type and size that does not carry a photocatalyst. The degree of contamination was evaluated by a spectrocolorimeter using a comparative control sample stored in a cool and dark place as a reference. Degree of discoloration after 3 months E Evaluation of change rate 50% or less A 100-50% B 200-100% C 200% or more D [0028]

2) Photocatalytic activity-organic matter decomposition activity On the surface of the sample cut into 5 x 5 cm, thinly 0.1 mg / cm of commercially available salad oil (Nissin salad oil) with Kimwive.²After applying so that it becomes, install it in a constant temperature and humidity chamber set at 40 ° C-90% and use a commercially available black light fluorescent lamp with an ultraviolet intensity of 3 mW / cm.²The distance between the light source and the sample was adjusted so as to be, and the weight change rate after 72 hours was compared with the blank sample to which the salad oil was not applied to determine the weight loss rate, and the organic matter decomposition activity by photocatalysis was measured. Weight loss rate evaluation after 72 hours 80% or more A 60-80% B 40-60% C 20-40% D 0 ~ 20% E [0029]

<Evaluation of Adhesiveness> Adhesiveness 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.

【0030】

<Evaluation of durability> UV intensity 3m / Wcm with black light on the supported sample²After irradiating the light in a constant temperature and humidity chamber with a temperature of 40 ° C and a humidity of 90% for 2000 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.

【0031】

[table 1]

<img file="JP2000027124A_D0001.tif" />【0032】

[Effect of the invention]

According to the present invention, since the photocatalyst layer is supported on the base material surface via the adhesive layer, the photocatalyst layer does not peel off from the base material surface, and the road ancillary equipment carrying the photocatalyst having decomposition activity for a long period of time. It is possible to provide a material component, and by constructing a road accessory using this road accessory component and installing it on the side of the road, it is possible to decompose and remove the dirt of the adhering exhaust gas.

[Simple explanation of drawings]

[Figure 1]

It is a schematic diagram of the cross section of the road accessory component which supported the photocatalyst of this invention.

[Figure 2]

It is a partially cutaway slope view of a road sign which is a road accessory constructed by using the road accessory component supporting the photocatalyst of the present invention.

[Fig. 3]

Similarly, it is a partially cutaway slope view of the soundproof wall.

[Fig. 4]

Similarly, it is a partially cutaway slope view of the light projection sound insulation wall.

[Fig. 5]

Similarly, it is a partially cutaway slope view of the guardrail.

[Fig. 6]

It is also a partially cutaway slope view of the delineator.

[Fig. 7]

It is also a partially cutaway slope view of the post cone.

[Explanation of symbols]

1 Photocatalytic layer 2 Adhesive layer 3 base material 11 Road signs 12 Soundproof wall 13 Sound absorbing material 14 Floodlight sound insulation wallboard 15 guardrail 16 Delineator 17 Post cone