JP2007321016A - Self-cleaning dry type fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-cleaning dry type fence washing fouling materials away quickly to keep the surface clean even when the fouling materials attach on its surface. <P>SOLUTION: This self-cleaning dry type fence is provided with that photocatalytic crystals equipped with photocatalytic function are contained in a photocatalyst-containing layer 2 formed on a plate-formed material 1, on irradiating light on the photocatalytic crystals, the photocatalyst is activated and high hydrophilicity is exhibited on the surface of the wall plate for being equipped with the self-cleaning property, by containing a hydrophilic agent in the photocatalyst-containing layer, the exhibited hydrophilicity of the photocatalyst is maintained, and also it is possible to be equipped with a high degree of the self-cleaning property by increasing the amount of the photocatalytic crystals in the vicinity of the surface on forming the photocatalytic layer 2. Also, since the photocatalytic crystals are blended directly with a coating vehicle resin, the formation of the photocatalyst-containing layer on the plate-formed material can become easier. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a self-cleaning dry tub that is installed near a boundary between a private land and a parking lot, an exterior of a house, a periphery of an outdoor unit used in a house, a store, an office, etc. Is.

  As a conventional soundproof partition wall having soundproofness and partitioning a space, for example, a sound absorbing material and a vertical direction are arranged between a pair of wall plates that are spaced apart from each other and form a wall surface of the partition wall. The extending studs are arranged alternately along the continuous direction of the partition wall, and the studs are the pillar members of the one wall plate and the studs of the other wall plate. A partition wall structure is disclosed which is composed of a member and an elastic body interposed between the spacer members.

JP-A-8-226181

  However, in the conventional dry rice cake as described in Patent Document 1, when pollutants adhere to the surface, rain streak occurs when water flows on the surface due to rain or the like, and there is a possibility that the aesthetics may be impaired. Met. In particular, when the wall plate is punched or bent, the flow of water concentrates on the punching holes or the convex portions, and there is a risk that rain streak stains may easily occur in those portions.

  The present invention has been made in view of the problems as described above, and is intended to provide a self-cleaning dry tub that can be quickly washed away even if contaminants adhere to the surface and keep the surface clean. .

  In order to achieve the above object, the present invention is configured as follows. That is, the self-cleaning dry rice cake according to the present invention includes a wall plate having a photocatalyst containing layer formed on a plate-like body and having the photocatalyst containing layer as an outer surface, and the photocatalyst containing layer contains a hydroxyl group. The main component is a coating vehicle resin, and contains a photocatalytic crystal and a hydrophilizing agent.

  According to the self-cleaning dry rice cake of the present invention, the photocatalytic crystal having a photocatalytic function is contained in the photocatalyst containing layer formed on the plate-like body, and the photocatalytic crystal is irradiated with light. The photocatalyst is activated and high hydrophilicity is expressed on the surface of the wall plate to provide self-cleaning properties. However, the photocatalyst-containing layer contains a hydrophilizing agent, so that the hydrophilicity of the expressed photocatalyst is increased. In addition, the amount of photocatalytic crystals in the vicinity of the surface can be increased during formation of the photocatalyst-containing layer to provide a high degree of self-cleaning. In addition, since the photocatalytic crystal is directly blended with the paint vehicle resin, the formation of the photocatalyst-containing layer on the plate-like body can be facilitated.

  The reason why the photocatalytic crystal is oriented near the surface is not completely clear, but the hydrophilic hydrophilizing agent repels the hydroxyl group of the hydroxyl group-containing paint vehicle resin when the photocatalyst containing layer is in a fluid state. Float on the surface of the containing layer. When the hydrophilizing agent floats, the photocatalytic crystal floats near the surface of the photocatalyst-containing layer together with the hydrophilizing agent, and in the fluid state, the photocatalytic crystal is near the surface like a bleed phenomenon. It is thought that it has surfaced.

  Further, if the photocatalytic crystal is a part of the surface coated with a protective substance that is inactive with respect to the photocatalytic function, the photocatalytic crystal is not in direct contact with the paint vehicle resin, or the contact area It is preferable that the coating vehicle resin is decomposed by the oxidizing action of the photocatalytic crystal of the photocatalytic crystal and the photocatalyst-containing layer is deteriorated.

  In addition, if the wall plate is provided with an opening, when the opening is provided in the wall plate, rainwater flowing down the surface of the wall plate is concentrated near the opening. Although rain streaks are likely to occur, the high hydrophilicity of the photocatalyst-containing layer can prevent the occurrence of rain streak and is preferable because the advantages of applying the present invention can be extremely great.

  In addition, a wall unit is provided in which a frame is provided around the wall plate, and the wall upper surface and / or the lower surface and the wall plate surface are in contact with each other so as to form an obtuse angle. The body unit makes it easy to form a dry paddle with a strong structure, but the wall plate surface and the upper and / or lower surface of the frame body are in contact with each other at an obtuse angle, and have been transmitted through the wall plate surface. Rainwater containing contaminants is preferably prevented from staying between the wall plate surface and the frame body and smoothly flowing down, preventing the upper surface and / or the lower surface of the frame from becoming dirty.

  Further, if the plate-like body is a metal resin laminated plate formed by using a synthetic resin as a base and metal plates are bonded to both sides of the base, both the strength and sound insulation by the metal and the weight reduction by the synthetic resin are compatible. Further, the surface of the wall plate becomes smooth and beautiful, and dirt is easily noticeable. Therefore, the advantage of applying the present invention can be greatly increased, which is preferable.

  Further, the plate-like body is a transparent or translucent synthetic resin plate, and if the photocatalyst-containing layer is translucent, it can prevent a decrease in translucency due to adhesion of contaminants, Therefore, it is possible to perform daylighting while maintaining translucency, and the advantage of applying the present invention becomes extremely large, which is preferable.

  According to the self-cleaning dry rice cake of the present invention, the photocatalytic crystal having a photocatalytic function is contained in the photocatalyst containing layer formed on the plate-like body, and the photocatalytic crystal is irradiated with light. The photocatalyst is activated and high hydrophilicity is expressed on the surface of the wall plate to provide self-cleaning properties. However, the photocatalyst-containing layer contains a hydrophilizing agent, so that the hydrophilicity of the expressed photocatalyst is increased. In addition, the amount of photocatalytic crystals in the vicinity of the surface can be increased during formation of the photocatalyst-containing layer to provide a high degree of self-cleaning. In addition, since the photocatalytic crystal is directly blended with the paint vehicle resin, the formation of the photocatalyst-containing layer on the plate-like body can be facilitated.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment according to the present invention will be specifically described below with reference to the drawings.

  1A and 1B show a first embodiment of a self-cleaning dry rice cake according to the present invention, wherein FIG. 1A is a front view and FIG. 1B is a cross-sectional view showing details of a wall plate. First, in (a), the self-cleaning dry tub W is formed with a frame body 20 around the wall plate 10 to form a wall body unit 100, and the wall body unit 10 is attached to a support column S erected from the ground surface. Is formed. Next, in (b), the wall plate 10 is a photocatalyst that is a coating layer containing, on the outer surfaces of both sides of the plate-like body 1, a paint vehicle resin containing a hydroxyl group as a main component and further containing a photocatalytic crystal and a hydrophilizing agent. The containing layer 2 is formed as an outer surface. When the photocatalytic crystal contained in the photocatalyst containing layer 2 is irradiated with light such as sunlight, the photocatalytic crystal is activated, and the outer surface of the photocatalyst containing layer 2 has a contact angle with water of about 1 to 20 °. Highly hydrophilic. By maintaining this hydrophilization with a hydrophilizing agent, the hydrophilicity is maintained over a long period of time and the self-cleaning property can be maintained.

  The plate-like body 1 forming the wall plate 10 is a metal resin laminate, and is formed by using a synthetic resin such as polyethylene as a base 11 and metal plates 12 attached to both sides of the base 11. The photocatalyst containing layer 2 is directly formed on the surface of the metal plate 12. In the formation of the photocatalyst-containing layer 2, a photocatalytic crystal and a hydrophilizing agent are blended with a forming paint in which a paint vehicle resin is dispersed in a solvent, applied to the surface of the metal plate 12, and cured by baking or the like. This application and baking may be performed in a state where the metal plate 12 is adhered to the substrate 11, but if it is necessary to bake the photocatalyst-containing layer 2 at a high temperature after application, the photocatalyst-containing layer 2 is applied to the metal plate 12. If the metal plate 12 is adhered to the base 11 after forming the film, it is preferable that the base 11 is prevented from being melted or softened by heat during baking to cause a problem.

The photocatalytic crystal contained in the photocatalyst-containing layer 2 is not particularly limited as long as it exhibits a photocatalytic function and can be hydrophilized. Fe ₂ O ₃ , Cu ₂ O, In ₂ O ₃ , Metals such as WO ₃ , Fe ₂ TiO ₃ , PbO, V ₂ O ₅ , FeTiO ₃ , Bi ₂ O ₃ , Nb ₂ O ₃ , SrTiO ₃ , ZnO, BaTiO ₃ , CaTiO ₃ , KTaO ₃ , SnO ₂ , ZrO ₂ An oxide semiconductor material may be used, but titanium oxide which is relatively inexpensive and easy to handle is preferably used. Among titanium oxides, anatase type titanium dioxide having high activity is preferable. Since the photocatalytic crystal is difficult to move in the fluidized coating layer 1 when the particle size is too large, it is preferable to use a photocatalytic crystal having a particle size of about 0.1 μm to 5 μm.

  Moreover, it is preferable to use a photocatalytic crystal in which a part of the surface is coated with a protective substance that is inactive with respect to the photocatalytic function. By containing photocatalyst fine particles in which a part of the surface is coated with a photocatalytic crystal with a protective substance that is inactive with respect to the photocatalytic function, the photocatalyst fine particles can be directly blended into the paint vehicle resin, and a paint containing hydroxyl groups Orientation of the photocatalytic crystal by the hydrophilizing agent repelling the hydroxyl group of the vehicle resin by floating near the surface when forming the photocatalyst-containing layer 2 can be smoothly performed without taking various other means. Further, a complicated process of separately providing a clear photocatalyst-containing layer on the surface of the colored paint is not required, and it is easy to obtain hydrophilicity by the photocatalyst.

  Protective substances covering a part of the surface of the photocatalytic crystal include montmorillonite, talc, silica gel, silica sol, silicate, silicon carbide, alumina, zeolite, zirconia, ceramics, apatite, titanium apatite, magnesia, cordierite, sepiolite , Calcium hydroxide, or a complex thereof. Among these, the photocatalyst can be easily attached to the photocatalytic crystal and repels the hydroxyl group contained in the hydroxyl group-containing paint vehicle resin. Porous silica that can promote the floating of the fine particles to the surface of the coating layer 1 can be suitably used. These substances are kneaded with a photocatalytic crystal by a mixer, or dispersed in a solvent such as water, and the photocatalytic crystal is immersed in the solution for an appropriate period of time, so that a protective substance is scattered on the surface of the photocatalytic crystal. It can be formed by, for example, precipitating into a crystalline form or precipitating into a net structure of a mask melon.

  In addition, as photocatalytic crystals, using titanium oxide in which a part of titanium atom or oxygen atom is substituted with nitrogen atom and / or sulfur atom, high photocatalytic function is developed by utilizing not only ultraviolet light but also visible light. Can be made. Furthermore, those obtained by introducing metal ions such as iron and copper into the nitrogen-doped and / or sulfur-doped titanium oxide fine particles to further enhance the photocatalytic function can be suitably used. In addition, when the metal resin laminate is used indoors, the photocatalytic crystal that exhibits a high photocatalytic function with respect to visible light is used to prevent the photocatalytic function from appearing even in an environment where ultraviolet light is not irradiated. It may be possible to demonstrate soiling performance.

  The hydrophilizing agent is not particularly limited as long as it exhibits hydrophilicity, repels the hydroxyl group of the hydroxyl group-containing paint vehicle resin, and can float on the surface of the photocatalyst-containing layer. The alkoxyl group is a methoxy group, A tetraalkoxysilane having 4 or less carbon atoms such as an ethoxy group or an oligomer obtained by partial hydrolysis thereof can be suitably used.

  A hydroxyl group-containing paint vehicle resin is a main component of a coating layer containing photocatalyst fine particles and a hydrophilizing agent and having hydrophilicity on the surface, for example, based on a hydroxyl group-containing synthetic resin material Thus, a fluorine resin, a polyester resin, an alkyd resin, a silicone resin, a polyester-modified acrylic resin, or the like can be used. In addition to photocatalytic crystals and hydrophilizing agents, this paint vehicle resin is coated with an inorganic pigment, UV absorber, etc. that are blended in ordinary paints and dispersed in a solvent. Thus, the photocatalyst-containing layer can be easily formed.

  Further, the surface of the protective material for the photocatalyst fine particles may be substituted with an alkoxyl group. By substituting with an alkoxyl group, a high repulsive force is generated between the hydroxyl group contained in the hydroxyl group-containing paint vehicle resin and the photocatalyst fine particles, thereby promoting the floating of the photocatalyst fine particles to the vicinity of the surface of the coating layer 1. it can. As the alkoxyl group, those having 4 or less carbon atoms, such as a methoxy group and an ethoxy group, are preferable because they can increase the efficiency of binding to a protective substance. Substitution of the surface of the protective substance with an alkoxyl group can be performed by dehydrating condensation of alcohols such as methyl alcohol and ethyl alcohol with hydroxyl groups bonded to the surface of the protective substance.

  Further, the surface of the photocatalyst fine particles may be substituted with an alkoxysilyl group. By substituting the surface of the photocatalyst fine particle with an alkoxysilyl group, the hydroxyl group contained in the paint vehicle resin containing the hydroxyl group and the protective group of the photocatalyst fine particle and the alkoxyl group of the alkoxysilyl group bonded to the photocatalytic crystal are hydrolyzed. A high repulsive force is generated between the generated hydroxyl group and the floating of the photocatalyst fine particles to the vicinity of the surface of the coating layer 1 is promoted, and the hydrophilic effect similar to that of the hydrophilizing agent can be obtained by the hydroxyl group. In order to replace the surface of the photocatalytic crystal with an alkoxysilyl group, the hydroxyl group bonded to the surface of the photocatalytic crystal is obtained by hydrolyzing the tetraalkoxysilane and converting a part of the alkoxyl group to a hydroxyl group. It can be carried out by dehydration condensation.

  FIG. 2 is a longitudinal cross-sectional view showing an example of a modification of the first embodiment of the self-cleaning dry rice cake according to the present invention. The two wall plates 10A and 10B are supported by the frame 20 with a space therebetween, and a sound absorbing material P is inserted between the wall plate 10A and the wall plate 10B. The plate-like body 1 that forms the wall plates 10A and 10B may be provided with the photocatalyst-containing layer 2 on both sides, but the self-cleaning property is required only on the surface located outside, and the sound absorbing material P The formation process and the material may be reduced without providing the photocatalyst-containing layer on the inner surface where is disposed. An appropriate material may be used as the sound absorbing material P, but a sound absorbing material such as glass wool or rock wool can be suitably used.

  3A and 3B show a second embodiment of the self-cleaning dry rice cake according to the present invention, wherein FIG. 3A is a front view showing the whole, and FIG. 3B is a detailed view of the periphery of the opening provided on the wall plate. FIG. The wall plate 10 forming the wall unit 100 attached to the support column S of the self-cleaning dry tub W is provided with the opening 3 which is a round punching hole on the entire surface. Are provided with ventilation and design. When water such as rain water flows down on the surface of the wall plate 10, the water flow N flowing down the periphery of the opening 3 as shown in FIG. In addition, since the water flows vertically from the lower end 31, the rainwater flow is concentrated on the surface immediately below the lower end 31, so that a rain streak is likely to be generated at that portion. The photocatalyst-containing layer 2 is formed on the outer surface of the wall plate 10, and water is diffused on the outer surface of the wall plate 10 by being highly hydrophilicized by 1 to 20 ° by the activation of the photocatalytic crystal containing the outer surface. As a result, rain streaks are less likely to occur, and even if pollutants are attached, they are easily washed away by rainwater, etc., so that the outer surface of the wall plate 10 is prevented from being contaminated and kept clean. Made.

  Drawing 4 is an explanatory view showing an example of modification in a second embodiment of a self-cleaning type dry rice cake concerning the present invention. This figure shows the end face of the wall plate 10 cut in the middle in the horizontal direction. The wall plate 10 in this example is formed by bending a thin metal plate to form a horizontal plane F1 and an upward inclined surface F2. The upper end of the inclined surface F2 and the lower end of the horizontal plane F1 are connected by the vertical surface F3, so that a sawtooth-like projection is formed intermittently toward the front side α. By providing a long hole-shaped opening 3 at an interval in the horizontal plane F1 of the wall plate 10, the opening 3 allows ventilation in a state where the rear side β cannot be seen from the front side α and is integrated. The metal thin plate can be easily formed only by drilling and bending the opening 3.

  When water such as rain water hits the wall plate 10, the water hitting the back side β of the wall plate 10 flows downward along the surface of the wall plate 10 and flows out from the opening 3 to the front side α. In this state, contaminants on the back side β are also led to the front side α together with water. The water flowing out from the opening 3 travels along the surface of the vertical surface F3 or directly falls on the upper surface of the inclined surface F2, so that rain streak contamination is extremely coupled with water containing contaminants on the front side α. It is likely to occur. By applying the self-cleaning type dry rice cake according to the present invention to the dry type rice cake using the wall plate 10, the outer surface of the dry type rice cake is highly hydrophilized to 1 to 20 ° by activating the photocatalytic crystal. Thus, water is diffused on the outer surface of the wallboard 10 to make it difficult for rain streaks, and even if contaminants adhere to it, it is easily washed away by rainwater, etc. Thus, a clean state is maintained.

  FIG. 5 is a longitudinal cross-sectional view showing a third embodiment of the self-cleaning dry rice cake according to the present invention. The self-cleaning dry tub W in the present embodiment includes a wall body unit 100 in which a frame body 20 is provided around a wall plate 10, and the wall body unit 100 is formed by being attached to a column (not shown). Although the point is not different from the first embodiment, the cross-sectional shape of the frame body 20 is a home base shape, and the tips of the upper surface 41 and the lower surface 42 are brought into contact with the surface of the wall plate 10. The surface of the wall plate 10 and the upper surface 41 and the surface of the wall plate 10 and the lower surface 42 are in contact with each other at an obtuse angle θ at the contact point 101. With such a configuration, water such as rain water containing pollutants that have traveled down the surface of the wall plate 10 flows smoothly downward without staying near the contact point 101 between the surface of the wall plate 10 and the frame body 20. As a result, it is possible to prevent the upper surface 41 and the lower surface 42 of the frame body 20 from becoming dirty. Further, the outer surface of the frame 20 including the upper surface 41 and the lower surface 42 may be subjected to a low contamination surface treatment such as a photocatalyst containing layer. Even if the wall plate 10 is clean, if the outer surface of the frame 20 is dirty, the dirt becomes conspicuous due to the contrast. Therefore, it is important to prevent the outer surface of the frame 20 from being dirty. The If the obtuse angle θ exceeds 90 °, the effect can be obtained, but more preferably about 120 to 150 °, and the upper surface 41 and the lower surface 42 are bent halfway when the contact point 101 is an obtuse angle θ. It may be a surface or a curved surface.

  FIG. 6 is a longitudinal sectional view of the vicinity of the frame body showing a state in which the wall body units 100 shown in FIG. 5 are stacked. The lower frame body 20A of the upper wall body unit 100A and the upper frame body 20B of the lower wall body unit 100B have the same width, and the surface positions of the side surfaces of the lower frame body 20A and the upper frame body 20B are the same. By matching both the front side α and the back side β, the flow N of water containing contaminants is smoothly flown from the wall unit 100A to the wall unit 100B without stagnating, thereby preventing the occurrence of dirt. be able to. If the outer surfaces of the lower frame body 20A and the upper frame body 20B are also subjected to a low-contamination surface treatment such as a photocatalyst-containing layer, it is possible to further prevent the occurrence of dirt.

  FIG. 7 is a longitudinal cross-sectional view showing a fourth embodiment of the self-cleaning dry tub according to the present invention. The plate-like body 1 forming the wall plate 10 is a transparent plate made of polycarbonate resin, and the photocatalyst-containing layer 2 is formed on both surfaces of the transparent plate-like body 1. Here, the translucent material is used for the paint vehicle resin for forming the photocatalyst-containing layer 2, so that the wall plate 10 transmits the light L and the wall is provided even if a self-cleaning dry soot is provided. Daylighting or the like can be achieved by the light L transmitted through the body 10. In the case of aiming at daylighting, the plate-like body 1 is not limited to a transparent one, and a translucent one can be used. Alternatively, the photocatalyst-containing layer 2 having slightly turbidity may be formed on the transparent plate-like body 1 so as to be in a semi-transparent state so that both lighting and blinding can be achieved. As the translucent paint vehicle resin, a transparent or translucent translucent one of the above-described paint vehicle resins may be appropriately used.

  The performance of the photocatalyst-containing layer formed on the wall plate of the self-cleaning dry soot according to the present invention will be described below with reference to examples.

Example 1
As a paint, a fluorocarbon resin paint “Flon Coat” (manufactured by Kawakami Paint Co., Ltd.) using a Lumiflon-based fluororesin as a hydroxyl group-containing paint vehicle resin is used. Anatase-type titanium dioxide photocatalyst is used for 61 parts by weight of the paint vehicle resin. 3 parts by weight of “Mask Melon Photocatalyst / Ultrafine Particles” (produced by Taihei Chemical Sangyo Co., Ltd., average particle size 3 μm) with a porous silica coated on a part (14%) of the surface with porous silica, the basic structure is _{n O n-1 (OEt)} 2n + 2 ( where n ≒ 10) and hydrophilizing agent "ethyl silicate 48" (Colcoat Co., Ltd.) was 3 parts by weight blended, to obtain a coating composition well-stirred It was. This coating composition was applied to a 0.2 mm thick aluminum foil whose surface was chromated by a roller coating method to form a 20 μm thick photocatalyst containing layer on the surface. The aluminum foil on which the photocatalyst-containing layer was formed was attached to a sheet made of polyethylene resin using a one-component urethane-based adhesive to obtain a wall plate used for the self-cleaning dry slag according to the present invention of Example 1.

(Example 2)
Disperse 10 g of “Maskmelon type photocatalyst / ultrafine particles” in 240 ml of ethyl alcohol from which moisture has been removed in advance by molecular sieves, and stir for 18 hours while heating at 80 ° C. using a reflux apparatus to form a surface of porous silica. Except for the use of a photocatalytic crystal substituted with an ethoxy group (absorption at wavelengths of 2982, 2937, and 2904 cm ⁻¹ observed in IR spectrum and confirmed substitution to an ethoxy group) In the same manner as in Example 1, a wall plate used in the self-cleaning type dry rice cake of Example 2 according to the present invention was obtained.

(Comparative Example 1)
As a paint, fluororesin paint "Flon Coat" (manufactured by Kawakami Paint Co., Ltd.) using Lumiflon-based fluororesin as a hydroxyl group-containing paint vehicle resin is used. Anatase-type titanium dioxide is used for 61 parts by weight of paint vehicle resin. 3 parts by weight of a certain ST-01 (manufactured by Ishihara Sangyo Co., Ltd.) was blended and sufficiently stirred to obtain a coating composition. This coating composition was applied to a 0.2 mm thick aluminum foil whose surface was chromated by a roller coating method to form a 20 μm thick photocatalyst containing layer on the surface. The aluminum foil in which the photocatalyst containing layer was formed was affixed on the sheet | seat made from a polyethylene resin using the 1 liquid urethane type adhesive agent, and the wall board of the comparative example 1 was obtained.

(Comparative Example 2)
A wall plate of Comparative Example 2 was obtained in the same manner as in Example 1 except that a coating layer containing no photocatalyst was formed on the aluminum foil using only the fluororesin paint “Freon Coat”.

  For the wall plates of Examples 1 and 2 and Comparative Examples 1 and 2, the hydrophilicity of the photocatalyst-containing layer surface was evaluated. The hydrophilicity was evaluated by measuring the contact angle with water after a 100-hour test using a sunshine weather meter and after leaving in a dark place for 50 hours. The results are shown in Table 1.

  In general, when the contact angle with water is 10 ° or less, it is said that a high level of antifouling performance is exhibited as a superhydrophilic surface, but Examples 1 and 2 are about 2 ° after 100 hours of the sunshine weather meter. It has been shown that a very high degree of hydrophilicity is expressed, and that it is maintained at 10 ° or less even after being left in a dark place, so that high antifouling performance is exhibited. In Example 2, the surface of the porous silica is substituted with an ethoxy group, which is an alkoxyl group, so that a contact angle with water lower than that in Example 1 and Comparative Example 1 is expressed after being left in the dark. It is shown that a higher anti-stain performance is exhibited. In Comparative Example 1 containing no hydrophilizing agent, a hydrophilicity with a contact angle with water of about 2 ° was developed just after the sunshine weather meter test, but after leaving in the dark, 14.9. It is clear that the hydrophilic sustainability as in Examples 1 and 2 is not provided.

  Further, the wall plates of Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated for durability against ultraviolet rays when used outdoors. For the evaluation of durability against ultraviolet rays, a test using a sunshine weather meter is performed, and a color difference and a gloss retention rate up to 1000 hours are measured every 250 hours. The color difference was calculated by calculating ΔE based on Lab measurement based on JIS-K8730. The gloss retention is obtained by measuring the 60 ° specular gloss based on JIS-K8741 and calculating the ratio (%) to the initial value. The results are shown in Table 2.

  In Examples 1 and 2, which are coated with porous silica, the color difference and gloss retention only change to the extent of an error even after 1000 hours of testing with a sign shine weather meter. It is shown that high durability against ultraviolet rays is provided by preventing direct contact between the photocatalytic crystal and the photocatalytic crystal. However, in Comparative Example 1, both the color difference and the gloss retention rate are clearly reduced as compared with Examples 1 and 2, and the photocatalytic crystals are activated by the irradiation of ultraviolet rays, and the coating vehicle resin is deteriorated. It is clearly shown that the durability against ultraviolet rays is insufficient.

It is explanatory drawing which shows 1st embodiment of the self-cleaning dry rice cake concerning this invention. It is a longitudinal cross-sectional view which shows an example of the deformation | transformation in 1st embodiment of the self-cleaning dry rice cake concerning this invention. It is a front view which shows 2nd embodiment of the self-cleaning dry rice cake concerning this invention. It is explanatory drawing which shows an example of the deformation | transformation in 2nd embodiment of the self-cleaning type dry rice cake concerning this invention. It is a longitudinal cross-sectional view which shows 3rd embodiment of the self-cleaning dry rice cake concerning this invention. It is a longitudinal cross-sectional view of the frame body vicinity which shows the state which laminated | stacked the wall body unit shown in FIG. It is a longitudinal cross-sectional view which shows 4th embodiment of the self-cleaning dry rice cake concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate-like body 2 Photocatalyst content layer 3 Opening 41 Upper surface (of frame) 42 Lower surface of (frame) 10 Wall plate 20 Frame body 100 Wall body unit W Self-cleaning dry rice cake

Claims (6)

A photocatalyst-containing layer having a photocatalytic function is formed on a plate-like body, and a wall plate having the photocatalyst-containing layer as an outer surface is provided. The photocatalyst-containing layer is mainly composed of a hydroxyl group-containing paint vehicle resin, and contains a photocatalytic crystal. Self-cleaning dry rice cake characterized by containing a hydrophilizing agent. 2. The self-cleaning dry tub according to claim 1, wherein a part of the surface of the photocatalytic crystal is coated with a protective substance that is inactive with respect to the photocatalytic function. The said wall board is provided with the opening part, The self-cleaning type dry rice cake characterized by the above-mentioned. It comprises a wall unit formed by providing a frame around the wall plate, and the upper and / or lower surface of the frame and the surface of the wall plate are in contact with each other at an obtuse angle. The self-cleaning dry rice cake according to any one of claims 1 to 3. 5. The self-cleaning dry rice cake according to claim 1, wherein the plate-like body is a metal resin laminated plate formed by bonding a metal plate to both surfaces of a synthetic resin as a base. . The said plate-shaped body is a transparent or semi-transparent synthetic resin board, Comprising: The said photocatalyst content layer is made translucent, The self-cleaning dry rice cake in any one of Claims 1-4 characterized by the above-mentioned. .

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