JPH09228072A - Outdoor member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the hydrophilicity of a surface layer and to prevent the damage by the waterdrop, snow, ice, etc., by forming the surface layer consisting of the grain of a photocatalyst on the surface of such an outdoor member as a power-transmission line. SOLUTION: A surface layer consisting only of the grain of a photocatalyst (titanium oxide, etc.) or the one contg. the photocatalyst grain is formed on the surface of an outdoor member such as a power-transmission line, antenna and roof, and the average surface roughness Ra is controlled to <=1μm. For example, when titanium oxide is used in the photocatalyst grain, the hydroxyl group (OH<-> ) constituting the water in the air is chemisorbed on Ti atom and the hydrogen atom (H<+> ) on the oxygen atom (O), further the water molecule in the air is physisorbed on the hydroxyl group (OH<-> ) and hydrogen atom (H<+> ), and the hydrophilicity is exhibited. Consequently, the deposited waterdrop forms a thin layer, the surplus water is dropped, snow and ice are hardly deposited, and the power-transmission line loss, communication trouble, transportation trouble, discontinuity, etc., are prevented.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a power transmission line, an antenna,
The present invention relates to a member such as a roof or a ski lift cable that is installed outdoors, and particularly relates to an outdoor member that eliminates the disadvantages caused by rain, snow, and ice.

[0002]

2. Description of the Related Art Outdoor members such as power transmission lines, antennas, roofs and ski lift cables are easily damaged by rain, snow and ice. For example, when water drops adhere to the power transmission line, the water drops form a downward conical shape, which facilitates discharge and leads to power transmission loss. In winter, the water drops droop in a icy manner, and the tip is sharpened to further increase the discharge amount. In addition, if snow and ice adhere to the antenna, the electric field intensity decreases, which deteriorates the quality of communication or causes communication failure.
In addition, if ice adheres to the ski lift cable, it will hinder the cable transportation. Furthermore, if ice and snow adhere to members such as power transmission lines, antennas, and roofs that are installed outdoors, the weight of them will cause, for example, cutting of power transmission lines, collapse of steel towers, bending of antennas, deformation of roofs, and leakage of rain. .

As a measure against the above-mentioned disadvantage, it has been proposed to make the surface of the member extremely water-repellent or hydrophilic (1994.17.17, Nihon Keizai Shimbun evening edition). Polytetrafluoroethylene is mentioned as a material exhibiting water repellency, and aluminum fluoride is mentioned as a material exhibiting hydrophilicity. In addition to this, many water-repellent and hydrophilic paints are commercially available.

When water repellency is imparted to the surface of a member, water droplets move around on the surface of the member. As a result, water droplets are less likely to adhere, and snow and ice are less likely to adhere because water droplets do not adhere.

On the other hand, when the surface of the member is made hydrophilic so that the contact angle with water is 10 ° or less, the water droplets adhering to the surface of the member instantly spread over the entire surface. Therefore, when it comes to power lines,
The amount of water that adheres to the power transmission line itself decreases because the water droplets that adhere to the power transmission line gather at the lowest point and fall from there. Similarly, antennas, roofing materials, and ski lift cables can also be prevented from being damaged by water drops, snow, or ice by making their surfaces water-repellent or hydrophilic.

[0006]

As described above, when a water-repellent or hydrophilic film is formed on the surface of a member, the contact angle with water is sufficiently large when the film is water-repellent and the hydrophilic film is hydrophilic. Since the contact angle with water is sufficiently small when a film is formed, it is possible to prevent damage by water droplets, snow or ice, but the effect of water repellency or hydrophilicity fades over time, and water droplets, Snow, ice, etc. will adhere, power transmission loss, communication failure,
It causes rain leaks.

[0007]

[Means for Solving the Problems] The present invention has been made in order to maintain hydrophilicity for a long period of time. That is, the present invention has been made based on the finding that photocatalyst particles such as titanium oxide have a function of hydrolyzing the surface of an article in addition to a function of decomposing dirt and malodorous components by a redox reaction.

The hydrophilizing action of the photocatalyst particles has not been known so far, but it has recently been newly discovered by the experiments of the present inventors. Although the theoretical basis has not been completely clarified, the hydroxyl group (OH ⁻ ) is chemically adsorbed on the surface of the photocatalyst particle by the photocatalytic effect, or the hydroxyl group (O
H ⁻ ) is replaced with an organic group, and water molecules in the air are physically adsorbed on the hydroxyl group (OH ⁻ ) to increase the physically adsorbed water, thereby increasing the hydrophilicity of the surface and reducing the contact angle with water to 0. We believe that a superhydrophilic surface close to ° will be realized.

As a specific example, a case where the surface layer is made of a silicone resin having a Si--O bond will be described. Before the photocatalyst particles are irradiated with light, as shown in FIG.
Since the alkyl group (R) is bonded to the atom, the surface layer shows hydrophobicity. However, when light having an energy higher than the band gap energy of the photocatalyst particles is irradiated, first, as shown in FIG. alkyl group (R) by the photocatalytic effects hydroxyl - is substituted (chemisorption), further the hydroxyl ^(OH) - exhibit hydrophilic water molecules in the air are physically adsorbed ^(OH).

Further, titanium oxide (Ti
O ₂ ) will be described. The state shown in FIG. 2A before the light irradiation is changed to the state shown in FIG. 2A when the light is irradiated, as shown in FIG. 2B. hydroxyl group constituting the (OH ^-) is a Ti atom, a hydrogen atom (H ⁺⁾ is chemically adsorbed to the oxygen atom (O), further the hydroxyl - water molecules and in the air a hydrogen atom (H ^{+) (OH)} Exerts hydrophilicity by physical adsorption.

In the above description, it is clear that the decomposition action of the substance possessed by the photocatalyst particles and the hydrophilization action are completely different. However, if a specific example is shown, TiO _{2 is} also anatase type TiO _2. Shows the decomposition action of the substance based on the redox reaction, but rutile-type TiO ₂ hardly shows the decomposition action of the substance based on the redox reaction. Also, among the photocatalysts, tin oxide does not show a decomposition effect of a substance based on a redox reaction.
In these photocatalyst particles, the energy level of the conduction band is not sufficiently high, so that the reduction reaction does not proceed. As a result, the electrons excited by the photoexcitation in the conduction band become excessive, and the electron-hole pairs generated by the photoexcitation are oxidized and reduced. It is believed that they recombine without participating in the reaction. However, these rutile type TiO ₂
Both tin oxide and tin oxide exhibit a hydrophilizing action. Further, the photocatalytic layer needs to have a thickness of at least 100 nm in order to exhibit the decomposing action of the substance, but it is possible for the photocatalytic layer to exhibit a hydrophilizing action if it has a thickness of several nm or more. From these facts, it can be said that the decomposition action of the substance by the photocatalyst and the hydrophilization action are completely different.

The present invention has been made on the basis of the above findings in order to solve the conventional problems. The power transmission line according to the present invention,
For outdoor installation members such as antennas, roofs, ski lift cables, etc., a surface layer consisting of photocatalyst particles alone or a surface layer containing photocatalyst particles was formed on the surface of the member.

Further, when the hydrophilicity of the surface becomes high, the liquid easily penetrates, and the adhesion force of ice or the like increases due to the anchor effect and the fastener effect. Therefore, when the surface is made hydrophilic, the surface average roughness Ra is made as small as possible so that the anchor effect and the fastener effect described above are not exhibited. Specifically, Ra is preferably 1 μm or less.

Further, since the redox action of the photocatalyst particles also has the action of decomposing dirt, there is a risk of corroding or discoloring the resin constituting the member or the surface layer. Therefore, the surface layer may contain particles that suppress the redox action of the photocatalyst particles without suppressing the hydrophilization action of the photocatalyst particles, or a protective film (layer) of such particles may be provided. Examples of such particles include alkali metals, alkaline earth metals, alumina, silica, zirconia, antimony oxide, amorphous titanium oxide, aluminum and manganese.
When the surface of the photocatalyst particles is provided with a protective film containing particles that suppress the redox action of the photocatalyst particles without suppressing the hydrophilization action of the photocatalyst particles, the protective film on the surface of the part exposed to the outside air Is removed by etching etc.,
Hydrophilization is further enhanced.

Titanium oxide is most preferred as the photocatalyst particles, but in addition to this, ZnO, SnO ₂ , SrTiO ₃ ,
Examples thereof include metal oxides such as WO ₃ , Bi ₂ O ₃ and Fe ₂ O ₃ . It is considered that, since a metal element and oxygen are present on the surface, a hydroxyl group (OH ⁻ ) is easily adsorbed on the surface, and therefore, it is easy to exhibit hydrophilicity.

As a method of forming a hydrophilic surface layer containing photocatalyst particles, taking titania (titanium oxide) as an example, the formation of amorphous titania, the application of titania containing silica, the application of titania containing tin oxide, the inclusion of titania Examples thereof include application of silicone paint.

The formation of amorphous titania is a method in which the surface to be coated is first coated with amorphous titania, and this is fired to change the phase to crystalline titania, and either of the following methods can be adopted. . (1) Hydrolysis and dehydration condensation polymerization of an organic titanium compound An alkoxide of titanium, for example, tetraethoxytitanium, tetraisopropoxytitanium, tetra-n-propoxytitanium, tetrabutoxytitanium, tetramethoxytitanium, or a hydrochloride such as hydrochloric acid or ethylamine After adding a decomposition inhibitor and diluting with an alcohol such as ethanol or propanol, the mixture is applied after partially or completely promoting the hydrolysis, and then the mixture is applied, and the temperature is from room temperature to 200 ° C. And dry. By drying, the hydrolysis of the alkoxide of titanium is completed to form titanium hydroxide, and a layer of amorphous titania is formed by dehydration-condensation polymerization of titanium hydroxide. Instead of titanium alkoxide,
Other organic titanium compounds such as titanium chelates or titanium acetate may be used. (2) Formation of Amorphous Titania with Inorganic Titanium Compound Inorganic titanium compounds such as TiCl ₄ or Ti (SO
4) The acidic aqueous solution of 2 is applied and dried at a temperature of 100 to 200 ° C. for hydrolysis and dehydration polycondensation to form a layer of amorphous titania. Or it may form a layer of amorphous titania on the surface to be coated by chemical vapor deposition of TiCl _4. (3) Formation of amorphous titania by sputtering A target of metal titanium is irradiated with an electron beam in an oxidizing atmosphere to form a layer of amorphous titania on the surface to be coated.

Application of silica-containing titania is to form a layer of a mixture of titania and silica on the surface to be coated. The ratio of silica to the total of titania and silica is 5 to 90 mol%, preferably 10 to 70 mol%, more preferably 10 to 50 mol%. The following method can be employed for forming the surface layer made of silica-containing titania. (1) A suspension containing particles of anatase type or rutile type titania and particles of silica is applied to a surface to be coated, and fired at a temperature equal to or lower than the softening point of the substrate (object to be coated). (2) Based on a mixture of a precursor of amorphous silica (for example, tetraalkoxysilane such as tetraethoxytitanium, tetraisopropoxytitanium, tetran-propoxytitanium, tetrabutoxytitanium, tetramethoxytitanium, etc.) and crystalline titania sol After applying to the surface of the material and hydrolyzing it as necessary to form silanol, heating at a temperature of about 100 ° C. or more and subjecting the silanol to dehydration polycondensation, the titania is bound with amorphous silica. Obtained surface layer (photocatalytic coating). In particular, if the dehydration condensation polymerization of silanol is performed at a temperature of about 200 ° C. or higher, the degree of polymerization of silanol can be increased, and the alkali resistance performance of the photocatalytic coating can be improved. (3) Dispersing silica particles in a solution of amorphous titania precursor (organic titanium compound such as alkoxide, chelate or acetate of titanium, or inorganic titanium compound such as TiCl ₄ or Ti (SO ₄ ) ₂ ) Is applied to the surface of the base material, and the titanium compound is cooled to room temperature for 20 minutes.
By subjecting it to hydrolysis and dehydration polycondensation at a temperature of 0 ° C.,
A thin film of amorphous titania in which silica particles are dispersed is formed. Next, the amorphous titania is changed into crystalline titania by heating to a temperature higher than the crystallization temperature of titania and lower than the softening point of the substrate. (4) Amorphous titania precursor (organic titanium compound such as alkoxide, chelate or acetate of titanium, or inorganic titanium compound such as TiCl ₄ or Ti (SO ₄ ) ₂ ) in a solution of amorphous titania precursor (For example, tetraalkoxysilanes such as tetraethoxytitanium, tetraisopropoxytitanium, tetran-propoxytitanium, tetrabutoxytitanium, tetramethoxytitanium, etc., silanols which are hydrolysates thereof, or polysiloxanes having an average molecular weight of 3000 or less) And apply to the surface of the substrate. Next, these precursors are subjected to hydrolysis and dehydration condensation polymerization to form a thin film composed of a mixture of amorphous titania and amorphous silica. Next, the amorphous titania is changed into crystalline titania by heating to a temperature higher than the crystallization temperature of titania and lower than the softening point of the substrate.

Application of tin oxide-containing titania is to form a layer of a mixture of titania and tin oxide on the surface to be coated. The ratio of tin oxide to the total of titania and tin oxide is 1 to 95 mol%, preferably 1 to 50 mol%. The following method can be adopted as a method for forming a surface layer made of titania mixed with tin oxide. (1) A suspension containing particles of anatase type or rutile type titania and particles of tin oxide is applied to a surface to be coated, and fired at a temperature equal to or lower than the softening point of the substrate (object to be coated). (2) Dispersion of tin oxide particles in a solution of a precursor of amorphous titania (organic titanium compound such as titanium alkoxide, chelate or acetate, or inorganic titanium compound such as TiCl ₄ or Ti (SO ₄ ) ₂ ) The resulting suspension is applied to the surface of the substrate, and the titanium compound is heated to room temperature for 20 minutes.
By subjecting it to hydrolysis and dehydration polycondensation at a temperature of 0 ° C.,
A thin film of amorphous titania in which tin oxide particles are dispersed is formed. Next, the amorphous titania is changed into crystalline titania by heating to a temperature higher than the crystallization temperature of titania and lower than the softening point of the substrate.

The titania-containing silicone paint is applied by using a paint in which titania (photocatalyst particles) is dispersed in a film-forming element made of uncured or partially cured silicone (organopolysiloxane) or a precursor of silicone. . Specifically, after the above coating material is applied to the surface of the base material, and after the film-forming element is cured, when the photocatalyst is photoexcited, the organic group bonded to the silicon atom of the silicone molecule is replaced with a hydroxyl group by the action of the photocatalyst. Then, the contact angle of the surface with water becomes close to 0 °, and the surface becomes hydrophilic (super-hydrophilic). This method can cure the film forming element at a relatively low temperature, and can be applied as many times as necessary,
In addition, there is an advantage that it can be easily made hydrophilic even by sunlight. The following resins can be used as the resin. Methyltrichlorosilane, methyltribromosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane, ethyltrichlorosilane, ethyltribromosilane, ethyltrimethoxysilane, ethyltriethoxysilane, Ethyltriisopropoxysilane, ethyltri-t-butoxysilane, n-propyltrichlorosilane, n-propyltribromosilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-propyltriisopropoxysilane, n-
Propyltri-t-butoxysilane, n-hexyltrichlorosilane, n-hexyltribromosilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, n-hexyltriisopropoxysilane, n-hexyltrit-butoxysilane, n-decyltrichlorosilane, n-decyltribromosilane, n-decyltrimethoxysilane, n-decyltriethoxysilane, n-
Decyltriisopropoxysilane, n-decyltri-t-
Butoxysilane, n-octadecyltrichlorosilane,
n-octadecyltribromosilane, n-octadecyltrimethoxysilane, n-octadecyltriethoxysilane, n-octadecyltriisopropoxysilane, n
-Octadecyltri-t-butoxysilane, phenyltrichlorosilane, phenyltribromosilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltriisopropoxysilane, phenyltri-t-butoxysilane, tetrachlorosilane, tetrabromosilane, tetramethoxy Silane, tetraethoxysilane, tetraisopropoxysilane, tetrabutoxysilane, dimethoxydiethoxysilane, dimethyldichlorosilane,
Dimethyldibromosilane, dimethyldimethoxysilane,
Dimethyldiethoxysilane, diphenyldichlorosilane, diphenyldibromosilane, diphenyldimethoxysilane, diphenyldiethoxysilane, phenylmethyldichlorosilane, phenylmethyldibromosilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, triethoxyhydrosilane , Tribromohydrosilane, trimethoxyhydrosilane, isopropoxyhydrosilane, tri-t-butoxyhydrosilane, vinyltrichlorosilane, vinyltribromosilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinyltrit-butoxysilane, Trifluoropropyltrichlorosilane, trifluoropropyltribromosilane, trifluoropropyltrimethoxysilane , Trifluoropropyltriethoxysilane, trifluoropropyltriisopropoxysilane, trifluoropropyltri-t-butoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycid Xypropyltrimethoxysilane, γ
-Glycidoxypropyltriethoxysilane, γ-glycidoxypropyltriisopropoxysilane, γ-glycidoxypropyltri-t-butoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropylmethyldi Ethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriisopropoxysilane, γ-
Methacryloxypropyltri-t-butoxysilane, γ
-Aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltriisopropoxysilane, γ-aminopropyltrit-butoxysilane , Γ-
Mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropyltriisopropoxysilane, γ-mercaptopropyltrit-
Butoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane, and their partial hydrolysates or mixtures thereof can be used. .

In order to ensure good hardness and smoothness of the silicone resin film, it is preferable to contain 10 mol% or more of the three-dimensional crosslinked siloxane. In order to provide sufficient flexibility of the resin film while securing good hardness and smoothness, it is preferable to contain 60 mol% or less of the two-dimensional crosslinked siloxane. In order to increase the rate at which the organic group bonded to the silicon atom of the silicone molecule is replaced with a hydroxyl group by photoexcitation, use is made of a silicone in which the organic group bonded to the silicon atom of the silicone molecule is an n-propyl group or a phenyl group. Is preferred. An organopolysilazane compound having a silazane bond can be used instead of the silicone having a siloxane bond.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows a specific example of an outdoor installation member according to the present invention, in which (a) is a perspective view of a power transmission line,
Although (b) is a perspective view of the antenna, (c) is a perspective view of the roof material, and FIG. 4 is a cross-sectional view of the surface layer, the present invention is not limited to these members.

Specific examples will be described below. (Example 1) Anatase-type titania sol (Nissan Kagaku T
A-15) and trimethoxymethylsilane (Nippon Synthetic Rubber Glasca B liquid) were mixed to prepare a titania-containing coating composition. The composition of this coating composition was 1 part by weight of trimethoxymethylsilane and 1 part by weight of titania. This coating composition is applied to the surface of a single wire coated cord, and the temperature is 150 ° C.
The surface layer is formed by heating and curing to
UV light was irradiated for 5 days using a B fluorescent lamp at an illuminance of 0.5 mW / cm ² .

(Evaluation 1) 2.5 m of the coated cord having the above surface layer was hung between two columns. As a comparative example, a normal cord having no surface layer formed was suspended in parallel with the coated cord having a surface layer formed. Then, watering the whole of these cords with a watering shower. As a result, innumerable water droplets were attached downward on the cord of the comparative example, whereas no water droplet was attached on the cord of the example. When observed for another 3 minutes, water droplets still remained on the cord of the comparative example, while the cord of the example was dry.

(Example 2) A Yagi-type antenna for a television, which was cut out to a length of 30 cm, was prepared, and the coating composition prepared in Example 1 was applied to this and cured by heating to 150 ° C. A surface layer was formed, and this surface layer was irradiated with ultraviolet rays for 5 days using a BLB fluorescent lamp at an illuminance of 0.5 mW / cm ² .

(Evaluation 2) A part of the antenna having the above-mentioned surface layer was immersed in a water tank. As a comparative example, a part of the antenna having no surface layer was immersed in a water tank.
Next, these examples and comparative examples were pulled up horizontally and held horizontally, and the state of water droplet adhesion was observed. Comparative example has 1 water drop
It was observed that zero or more were hanging. On the other hand, in the example, no unevenness of water droplets was observed, and it was observed that the water droplets were uniformly wet.

[0027]

As described above, according to the present invention, a surface layer comprising photocatalyst particles alone or a surface containing photocatalyst particles is formed on the surface of an outdoor member such as a power transmission line, an antenna, a roof, a ski lift cable or the like. Since the layers are formed, the hydrophilicity of the surface layer can be maintained only by placing these members in an environment where light having an energy higher than the band gap energy of photocatalyst particles such as ultraviolet rays is irradiated. And, as long as the surface layer remains hydrophilic, the attached water droplets become a thin film, excess water falls, and snow and ice are also less likely to attach, resulting in power transmission loss, communication failure, transportation failure or weight. It is possible to prevent disconnection, breakage, deformation and the like due to increase.

Further, the surface layer may contain particles that do not suppress the hydrophilizing action of the photocatalyst particles but suppress the redox action of the photocatalyst particles, or suppress the hydrophilizing action of the photocatalyst particles between the surface layer and the member. Without providing a protective layer containing particles that suppress the redox action of the photocatalyst particles, or containing particles that suppress the redox action of the photocatalyst particles without suppressing the hydrophilization action of the photocatalyst particles on the surface of the photocatalyst particles By providing the protective film, the hydrophilicity can be maintained while preventing the deterioration of the resin forming the member or the surface layer due to the redox action of the photocatalyst particles.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a process of imparting hydrophilicity to the surface of a silicone resin containing photocatalyst particles.

FIG. 2 is a diagram illustrating a process of imparting hydrophilicity to a surface layer made of photocatalytic particles.

3A is a perspective view of a power transmission line as an outdoor installation member according to the present invention, FIG. 3B is a perspective view of an antenna as an outdoor installation member according to the present invention, and FIG. 3C is an outdoor installation member according to the present invention. Perspective view of roofing material

FIG. 4 is a sectional view of a surface layer.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location E04D 1/28 E04D 1/28 A (72) Inventor Shin Hayakawa 2 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka 1-1-1 Totoki Co., Ltd. (72) Inventor Makoto Senkoku 2-1-1-1, Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture (72) Inventor Atsushi Kitamura Kitakyushu, Fukuoka 2-1, 1-1 Nakajima, Kokurakita-ku Totoki Equipment Co., Ltd.

Claims (6)

[Claims] 1. An outdoor installation member such as a power transmission line, an antenna and a roof, characterized in that a surface layer consisting of photocatalyst particles alone or a surface layer containing photocatalyst particles is formed on the surface of the member. . 2. The outdoor installation member according to claim 1, wherein the surface layer has an average surface roughness Ra of 1 μm or less. 3. The outdoor installation member according to claim 1 or 2, wherein the surface layer contains particles that suppress a photocatalytic particle's redox action without suppressing a hydrophilizing action of the photocatalyst particle. Outdoor installation member characterized by. 4. The outdoor installation member according to claim 1 or 2, wherein particles that suppress a photocatalyst particle's oxidation-reduction effect without suppressing a hydrophilization effect of the photocatalyst particle between the surface layer and the frame. An outdoor installation member, which is provided with a protective layer containing. 5. The outdoor installation member according to claim 1 or 2, wherein the surface of the photocatalyst particles constituting the surface layer does not inhibit the hydrophilization action of the photocatalyst particles and inhibits the redox action of the photocatalyst particles. An outdoor installation member, which is provided with a protective film containing particles. 6. The outdoor installation member according to claim 5, wherein the protective film on the surface of the portion of the photocatalyst particles exposed to the outside air is removed.