JP3647269B2 - Self-cleaning translucent sound insulation wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a translucent sound insulation wall installed along a road or a railway line for the purpose of sound insulation.
[0002]
[Prior art]
In order to insulate noise from vehicles, sound insulation boards are installed along roads and railway lines. Some of these sound insulation boards are made from opaque boards such as PC concrete and metal, but those made from opaque boards are excellent in sound insulation, but the surrounding scenery is blocked by the opaqueness, so there is a feeling of pressure. Yes, and the scenery is poor. Therefore, in recent years, in order to provide a wealth of see-through performance, a sound insulating plate made of a translucent plate having translucency has been installed along roads and railways.
[0003]
[Problems to be solved by the invention]
However, since the sound insulation plate is installed on the road and is always exposed to the exhaust gas and dust of the vehicle, if it is not cleaned from time to time, the exhaust gas and dust will adhere to the sound insulation plate and become dirty. In the case of a plate, there is a problem that the fluoroscopic performance is remarkably lowered. However, manual cleaning is not only cumbersome and time-consuming, but even if the road side can be cleaned, the opposite side of the road can be cleaned by using an overhanging device on the outside of the sound insulation wall. Had to do. Therefore, as described in Japanese Utility Model Publication No. 6-3844, the present applicant attaches a translucent plate so as to be rotatable about a rotation shaft, and rotates the translucent plate as appropriate so that the opposite side to the road can be A sound barrier that can be washed more is proposed. However, since the cleaning is still manual, it is troublesome and troublesome.
[0004]
Therefore, the present invention solves the above-described problems, and a self-cleaning translucent sound insulation wall that can maintain the see-through performance of the translucent plate over a long period of time by cleaning contaminants adhering to the sound insulation plate without manpower. Is intended to provide.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
That is, the self-cleaning translucent sound-insulating wall according to the present invention has a sound-insulating plate supported between columns that are erected at a predetermined interval, and the sound-insulating plate is made of aluminum on the outer peripheral edge of a translucent plate made of a synthetic resin plate. A frame made of an alloy is attached and reinforced, and a siliceous ceramic layer made of polysilazane or a modified product thereof is directly formed on the translucent plate with a thickness of 0.02 to 5 μm and on the siliceous ceramic layer A photocatalyst-containing layer is directly formed, the surface of the photocatalyst-containing layer is hydrophilized with a contact angle with water of 0 to 20 degrees, and contaminants adhering to the surface are washed away by rain or the like. It is characterized by being able to maintain performance .
[0006]
According to the present invention, since the photocatalyst-containing layer containing a photocatalyst such as titanium dioxide is formed on the outer surface, the outer surface is hydrophilized by the photocatalyst, and contaminants are effectively washed. That is, photocatalysts such as titanium dioxide are activated by irradiating with ultraviolet rays to express a strong oxidizing power and the surface thereof is hydrophilized, and even if contaminants such as dust and vehicle exhaust gas adhere to the surface, Contaminants are decomposed by strong oxidizing power, and the hydrophilic surface makes it difficult for water to adhere to the surface because water enters between the surface and the surface of the contaminant to adhere to the surface. Since it is easily washed away and removed by rainfall or the like, contaminants are less likely to accumulate.
[0007]
In the present invention, a siliceous ceramic layer made of polysilazane or a modified product thereof is formed between the translucent plate and the photocatalyst containing layer on the outer surface. Photocatalysts such as titanium dioxide have a strong oxidizing power as described above, so when a synthetic resin plate such as polycarbonate or acrylic is used for the translucent plate, the translucent plate is also oxidized and decomposed and its durability Sexuality is impaired. Therefore, durability can be improved by forming a silicone-based film between the photocatalyst-containing layer and the translucent plate. This silicone-based film can be obtained by polymerizing a hydrolyzate of alkoxysilane by the sol-gel method of the prior art, but this method is difficult to form a dense film and is porous so It is not sufficient to protect the plate, and sufficient heat resistance, flex resistance, wear resistance, etc. cannot be obtained. In contrast, in the present invention, the siliceous ceramic film made of polysilazane or a modified product thereof formed between the photocatalyst-containing layer and the translucent plate is a very dense film, and also has heat resistance, flex resistance, It has excellent wear properties, and even a thin film has a high coating film hardness.
[0008]
Therefore, according to the present invention, as described above, the siliceous ceramic layer made of polysilazane or a modified product thereof is a very dense film, so that the translucent plate is protected from the oxidative decomposition action of the photocatalyst even in a thin film, In addition, because it has excellent heat resistance, no cracks are generated even when the photocatalyst-containing layer is fired, and since it has excellent bending resistance, it does not generate cracks even if it is bent. The translucent plate is not easily damaged because it has excellent properties and has a high coating film hardness even in a thin film.
[0009]
The material of the translucent plate in the present invention is a synthetic resin plate such as polycarbonate or acrylic that is light and inexpensive and has a low risk of damage.
[0010]
The polysilazane in the present invention is not particularly limited, but preferably has at least a Si—H bond or an N—H bond in the molecule, and may be a polysilazane alone or a polysilazane and another polymer. It may be a copolymer or a mixture of polysilazane and other compounds, and polysilazane may be a chain, or may have a cyclic or cross-linked structure, and further have these multiple structures in the molecule at the same time. However, these may be used alone or in a mixture.
[0011]
The film thickness of the siliceous ceramic layer made of this polysilazane or its modified product is preferably 0.02 to 5 μm, preferably 0.05 to 2 μm, and if it exceeds 5 μm, the polysilazane has been converted into a siliceous ceramic layer. Sometimes cracks occur. In order to form this siliceous ceramic layer, a composition for forming a coating film comprising polysilazane or a modified product thereof is applied to a translucent plate by an appropriate method such as spray coating, dip coating, spin coating, flow coating, roll coating or the like. What is necessary is just to convert into a siliceous ceramic layer. The application may be performed once or two or more times.
[0012]
In addition, after apply | coating the said coating-film formation composition, in order to convert this coating film into a siliceous ceramic layer, you may carry out by heating and baking at high temperature, but a translucent board is polycarbonate, an acryl, etc. Therefore , the following method is preferable because the heating temperature has a limit and can be converted into a siliceous ceramic layer at a low temperature where deformation and deterioration of the synthetic resin plate do not occur as much as possible.
[0013]
That is, it is formed from a film-forming composition in which amines or / and acids are added to polysilazane or a modified product thereof, or a coating film in which amines or / and acids are added to polysilazane or a modified product thereof. If the forming composition is formed by contacting with water vapor, it can be fired at a low temperature of about 150 ° C. and can be converted into a siliceous ceramic layer at a high speed.
[0014]
To form a photocatalyst-containing layer containing a photocatalyst such as titanium dioxide on the outer surface, a thermal spraying method in which a powder such as titanium dioxide is melted and sprayed, or a CVD (chemical film-forming method) in which titanium dioxide is deposited through a chemical reaction In addition, it may be formed by a suitable method such as a sputter vapor deposition method in which titanium dioxide or the like is deposited by sputtering evaporation, a vacuum vapor deposition method, etc., but titanium dioxide or the like is dispersed in a binder to form a coating composition, which is dipped or sprayed, Application by a flow coater or the like is preferable because a uniform and smooth film is formed.
[0015]
When the photocatalyst-containing layer is formed by such a method, it is preferable to use a silicone compound as the binder. By using a silicone-based compound, the resulting photocatalyst-containing layer has a high surface hardness and is less likely to be scratched, and is also deteriorated by activated titanium dioxide, etc. due to excellent chemical resistance and stain resistance due to siloxane bonds. It is hard to be polluted, and it becomes difficult to adhere pollutants.
[0016]
When a photocatalyst-containing layer is formed using a silicone compound as a binder, for example, a coating composition comprising a mixture of a hydrolyzate of alkoxysilane such as organopolysiloxane or tetraethoxysilane and titania sol is applied. It can be formed by heating at 50 to 200 degrees.
[0017]
Titanium dioxide as a photocatalyst may be a rutile type, but is preferably anatase type because of its high activity, and is activated by irradiating the titanium dioxide with ultraviolet light having a wavelength region of 300 to 400 nm. The strong oxidizing power is expressed by the oxidization, the pollutants attached to the surface are decomposed , and the surface is hydrophilized by activation at a contact angle with water of 0 to 20 degrees. It becomes difficult to adhere, and even if it adheres, it will be easily washed away by rain or the like.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be specifically described with reference to the drawings.
That is, FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part.
[0019]
The form in the drawing is composed of a column 1 made of H-shaped steel erected on a side edge of an expressway or the like along the longitudinal direction of the road and a sound insulating plate 2 supported between the columns 1. It is what is done.
[0020]
The sound insulating plate 2 has a translucent plate 3 made of a synthetic resin plate such as polycarbonate or acrylic resin, a siliceous ceramic layer 4 made of polysilazane or a modified product thereof, and a photocatalyst such as titanium dioxide on the outer surface. The photocatalyst containing layer 5 containing is formed. The siliceous ceramic layer 4 is directly formed on the translucent plate 3, and the photocatalyst-containing layer 5 is directly formed on the siliceous ceramic layer 4.
[0021]
By irradiating the photocatalyst containing layer 5 with ultraviolet rays, the photocatalyst is activated to make its surface hydrophilic, and contaminants adhering to the surface are washed away by rain or the like. The photocatalyst containing layer 5 is preferably formed as thin as possible so as not to impair the see-through performance of the translucent plate 3. The siliceous ceramic layer 4 is formed on both surfaces of the transparent plate 3, it is preferable to form a photocatalyst-containing layer 5 on the both sides, but it may also be formed in any one side. The sound insulating plate 2 is reinforced by attaching a frame 6 made of an aluminum alloy to the outer peripheral edge thereof.
[0022]
The ultraviolet ray that activates the photocatalyst may be installed on the road and receive from sunlight. However, when the ultraviolet ray is irradiated by a black light or the like in advance in a factory, the photocatalyst is activated. May be activated so that the surface of the photocatalyst containing layer 5 is hydrophilized.
[0023]
【Example】
Examples of the present invention will be described below.
[0024]
(Example)
A translucent plate was prepared from a synthetic resin plate made of polycarbonate, and the following coating agent was applied to the translucent plate. Perhydropolysilazane was dissolved in decahydronaphthalene and adjusted to a concentration of 20 wt%. While stirring, 10 mg of this solution was gradually added with 200 mg of tri-n-pentylamine at room temperature. This was applied by flow coating on the polycarbonate in the atmosphere. This was converted into a siliceous ceramic layer by heating in a constant temperature and humidity chamber of 100 ° C. and 90% RH for 1 hour. The film thickness of this siliceous ceramic layer was 0.5 μm.
[0025]
Next, 56 parts by weight of anatase-type titanium oxide sol (Nissan Chemical, TA-15, solid content 15 wt%) and 33 parts by weight of silica sol (Nippon Synthetic Rubber, Glasca A solution, solid content 20 wt%) were mixed, and then methyltrimethoxy 11 parts by weight of silane (Nippon Synthetic Rubber, Glassca B solution) and ethanol were added, and the mixture was further stirred for 2 hours to adjust methyltrimethoxysilane partially by hydrolysis reaction and dehydration condensation polymerization reaction. This was applied onto the siliceous ceramic layer by flow coating to form a photocatalyst-containing layer.
[0026]
Next, the surface of the obtained sample was irradiated with ultraviolet rays at an illuminance of 1.5 mw per square centimeter for 48 hours using a black light blue fluorescent lamp. Thereafter, when the contact angle of the surface with water was measured, it was 5 degrees or less on average.
[0027]
(Comparative example)
A translucent plate was prepared from a synthetic resin plate made of polycarbonate, and the following coating agent was applied to the translucent plate. After mixing 3 parts by weight of silica sol (Nippon Synthetic Rubber, Glassca A solution, solid content 20 wt%), 1 part by weight of methyltrimethoxysilane (Nippon Synthetic Rubber, Glassca B solution) and ethanol are added and stirred for another 2 hours. Methyltrimethoxysilane was partially adjusted by a hydrolysis reaction and a dehydration condensation polymerization reaction. This was applied to the above polycarbonate by flow coating and heated at 120 ° C. for 50 minutes to obtain a siliceous ceramic layer by a conventional sol-gel method. The film thickness of this siliceous ceramic layer was 1.0 μm.
[0028]
Next, 56 parts by weight of anatase-type titanium oxide sol (Nissan Chemical, TA-15, solid content 15 wt%) and 33 parts by weight of silica sol (Nippon Synthetic Rubber, Glasca A solution, solid content 20 wt%) were mixed, and then methyltrimethoxy 11 parts by weight of silane (Nippon Synthetic Rubber, Glassca B solution) and ethanol were added, and the mixture was further stirred for 2 hours to adjust methyltrimethoxysilane partially by hydrolysis reaction and dehydration condensation polymerization reaction. A photocatalyst containing layer was formed on the siliceous ceramic layer by flow coating.
[0029]
Next, the surface of the obtained sample was irradiated with ultraviolet rays at an illuminance of 1.5 mw per square centimeter for 48 hours using a black light blue fluorescent lamp. Thereafter, when the contact angle of the surface with water was measured, it was 5 degrees or less on average.
[0030]
The above-mentioned Examples and Comparative Examples were compared for coating film performance in the following tests.
[0031]
(Test 1) The sample obtained in the anti-decomposability example for the photocatalyst-containing layer and the sample obtained in the comparative example were irradiated with ultraviolet rays for 240 hours with a super energy irradiation tester (Suga Tester UE-1DEc type). As a result, cracks were observed in the siliceous ceramic layer in the comparative example, whereas no abnormality was observed in the siliceous ceramic layer in the example.
[0032]
(Test 2) As a result of heating the sample obtained in the heat resistance example and the sample obtained in the comparative example at 130 degrees for 2 hours, cracks were observed in the siliceous ceramic layer in the comparative example. No abnormality was found in the siliceous ceramic layers in the examples.
[0033]
(Test 3) Flexibility The sunshine weather meter test was conducted in a state where the sample obtained in the example and the sample obtained in the comparative example were curved to a radius of 2000 mm. As a result, in the sample of the comparative example, fine cracks were observed on the surface in 100 hours, whereas in the example, no abnormality was observed when 500 hours passed.
[0034]
(Test 4) Abrasion resistance A pencil hardness test was performed in order to compare the abrasion resistance of the sample obtained in the example and the sample obtained in the comparative example. As a result, in the sample of the comparative example, the pencil hardness was F to H, whereas in the example, it was 2H to 3H.
[0035]
From the above, since the siliceous ceramic layer made of polysilazane or its modified product is a very dense film, it has excellent functions for protecting the light-transmitting plate from the decomposition action of the photocatalyst, heat resistance, flex resistance, and wear resistance. It is confirmed that it is suitable for a translucent sound insulation wall.
[0036]
【The invention's effect】
According to the present invention, since the photocatalyst-containing layer containing a photocatalyst such as titanium dioxide is formed on the outer surface, the outer surface is hydrophilized by the photocatalyst, and contaminants are effectively washed. That is, photocatalysts such as titanium dioxide are activated by irradiating with ultraviolet rays to express a strong oxidizing power and the surface thereof is hydrophilized, and even if contaminants such as dust and vehicle exhaust gas adhere to the surface, Contaminants are decomposed by strong oxidizing power, and the hydrophilic surface makes it difficult for water to adhere to the surface because water enters between the surface and the surface of the contaminant to adhere to the surface. Since it is easily washed away and removed by rainfall or the like, contaminants are less likely to accumulate.
[0037]
According to the present invention, a siliceous ceramic layer made of polysilazane or a modified product thereof is formed between the translucent plate and the photocatalyst containing layer, and the siliceous ceramic layer made of the polysilazane or a modified product thereof is very dense. Therefore, even in a thin film, the light-transmitting plate is protected from the oxidative decomposition action of the photocatalyst, and because it is excellent in heat resistance, no cracks are generated even when the photocatalyst-containing layer is fired, and Due to its excellent flexibility, cracks do not occur even when it is bent, and it has excellent durability in this state, and even a thin film has a high coating film hardness, so that the translucent plate is hardly damaged. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support | pillar 2 Sound insulation board 3 Light transmission board 4 Siliceous ceramic layer 5 Photocatalyst containing layer 6 Frame

Claims (3)

A sound insulation plate is supported between the support columns erected at a predetermined interval, and the sound insulation plate is reinforced by attaching a frame body made of an aluminum alloy to the outer peripheral edge of the light transmission plate made of a synthetic resin plate. A siliceous ceramic layer made of polysilazane or a modified product thereof is directly formed on the optical plate with a film thickness of 0.02 to 5 μm, and a photocatalyst containing layer is directly formed on the siliceous ceramic layer. The contact angle with water is hydrophilized to 0 to 20 degrees, and contaminants adhering to the surface are washed away by rain or the like, so that the see-through performance of the translucent plate can be maintained. A self-cleaning translucent sound insulation wall.   2. The self-cleaning translucent sound-insulating wall according to claim 1, wherein the siliceous ceramic layer is formed from a composition for forming a coating film in which amines or / and acids are added to polysilazane or a modified product thereof. .   The siliceous ceramic layer is formed by bringing a coating film forming composition in which amines or / and acids are added to polysilazane or a modified product thereof into contact with water vapor. Self-cleaning translucent sound insulation wall.

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