JPH1181251A - Self-cleaning type soundproof panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-cleaning type soundproof panel in which contaminant stuck to the soundproof panel can be washed away spontaneously and the beautiful appearance can be maintained for a long term. SOLUTION: A hydrophilized film 5 by activating titanium dioxide as an optical catalyst is formed on the surface of a front plate 1. Hereby, even if contaminant such as dust exhaust gas of a vehicle sticks onto the surface of the front plate 1, the contaminant is decomposed by the strong oxidizing force of the activated titanium dioxide and further by the hydrophilized, surface water is introduced between the contaminant stuck to the surface and the surface to float up the contaminant, and hence the contaminant hardly sticks to the surface and is easily washed away by rainfall or the like even in the case sticking. Accordingly, the contaminat hardly sticks to it, and the beautiful appearance of the front plate 1 is maintained in the good condition for a long term.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a vehicle along a highway or a railway along a railway or the like, in order to isolate or absorb noise caused by the running of a vehicle or the like.
The present invention relates to a self-cleaning soundproof panel installed on a lower surface, a wall surface, a ceiling surface, or the like of a structure such as a semi-underpass.

[0002]

2. Description of the Related Art A sound-absorbing material is provided inside a hollow panel body formed by a front plate and a rear plate having a large number of openings as a soundproof panel used for insulating and absorbing noise caused by running of a vehicle or the like. There are things. Such a soundproof panel is configured such that sound enters the hollow panel body through an opening in the front panel, is absorbed by the sound absorbing material, and is attenuated by repeating reflection in the hollow panel body, and furthermore, the sound is blocked by the rear panel. The sound was not leaked from the back.

[0003]

However, since the soundproof panel is installed outdoors and is constantly exposed to the exhaust gas and dust of the vehicle, such exhaust gas and dust adhere to the soundproof panel unless it is washed from time to time. There is a problem that the aesthetic appearance is impaired. There is also a problem that the hollow panel body is rusted or deteriorated by contaminants such as exhaust gas and dust attached thereto. However, cleaning by hand is very troublesome and troublesome. In particular, since the front plate facing the vehicle or the like has a large number of openings, it is very difficult to clean by hand.

Accordingly, the present invention solves the above-mentioned problems,
It is an object of the present invention to provide a self-cleaning soundproof panel that can maintain aesthetic appearance for a long period of time by cleaning contaminants attached to the soundproof panel without human intervention.

[0005]

In order to achieve the above object, the present invention has the following arrangement. That is, the self-cleaning type soundproof panel according to the present invention is a soundproof panel in which a sound absorbing material is provided inside a hollow panel formed by a front plate and a back plate having a large number of openings, and the front plate is A film containing titanium dioxide as a photocatalyst is formed on the surface, and by irradiating the film with ultraviolet light, the titanium dioxide is activated and the surface is hydrophilized, and contaminants attached to the surface due to rainfall or the like are washed. It is characterized by having been done.

[0006] According to the present invention, since a film that has been hydrophilized by activating titanium dioxide as a photocatalyst is formed on the surface of the front plate, contaminants such as dust and vehicle exhaust gas can be removed from the front plate. Even if it adheres to the surface, the activated titanium dioxide decomposes the contaminants due to the strong oxidizing power of the activated titanium dioxide, and the hydrophilic surface causes water to break between the contaminants adhering to the surface and the contaminants. It is hard to adhere to float, and even if it adheres, it is easily washed away and removed by rainfall etc., so that contaminants do not easily adhere, and the aesthetic appearance of the front plate can be maintained in a good state for a long time.

[0007]

Next, an embodiment of the present invention will be specifically described with reference to the drawings. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a perspective view of a main part of FIG.

In this embodiment, a sound absorbing material 4 is provided in a hollow panel body 3 formed by a front panel 1 and a rear panel 2 having a large number of apertures 11 and is hollow from the apertures 11 in the front panel 1. The sound is made to enter the panel body 3 and is absorbed by the sound absorbing material 4, and the sound is attenuated by being repeatedly reflected in the hollow panel body 3, and furthermore the sound is shielded by the back plate 2 so that the sound does not leak from the back surface. It was done as such. Also, a coating 5 containing titanium dioxide as a photocatalyst is formed on the surface of the front plate 1, and the coating 5 is irradiated with ultraviolet light to activate the titanium dioxide and hydrophilize the surface, and to cause the surface to fall due to rainfall or the like. The contaminants adhered to the surface are cleaned.

The front plate 1 is generally made of an aluminum alloy plate or a synthetic resin plate for weight reduction, and the back plate 2 is generally made of a zinc steel plate for sound insulation. The sound absorbing material 4 is generally made of glass wool, rock wool, or the like, but is not particularly limited. For example, metal fibers such as aluminum, powder or particles of metal or ceramic, and the like may be used.
Others may be used.

The coating 5 containing titanium dioxide as a photocatalyst is formed on the front plate 1 facing a vehicle or the like, but may be formed on the entire surface of the hollow panel body 3.
It may be formed on the surface of front plate 1 and back plate 2.

In order to form a coating 5 containing titanium dioxide as a photocatalyst on the front panel 1, a spray of titanium dioxide powder is melted and sprayed onto the front panel 1 as a member before the hollow panel body 3 is formed. It may be formed by an appropriate method such as CVD (chemical film forming method) in which titanium dioxide is deposited through a chemical reaction, sputter evaporation method in which titanium dioxide is sputter-evaporated and deposited, and vacuum evaporation method. It is preferable to form a coating composition by dispersing titanium dioxide into the coating composition and apply the coating composition by dipping, spraying, flow coater, or the like, since a uniform and smooth coating film 4 is formed.

When the film 5 is formed by such a method, it is preferable to use a silicone compound as a binder. By using a silicone compound, the resulting coating 5 has a high surface hardness and is not easily damaged, and is also degraded by titanium dioxide or the like which is activated due to excellent chemical resistance and stain resistance due to siloxane bonds. And contaminants are less likely to adhere.

When the coating 5 is formed using a silicone compound as a binder, for example,
It can be formed by applying a coating composition comprising a mixture of a hydrolyzate of an alkoxysilane such as an organopolysiloxane or tetraethoxysilane and a titania sol, and heating the mixture at 50 ° C to 200 ° C.

Titanium dioxide as a photocatalyst may be of rutile type, but is preferably of anatase type because of its high activity, and this titanium dioxide has a wavelength range of 300 to 400 nm.
m is activated by irradiating ultraviolet light around m. The activation causes a strong oxidizing power to be developed, contaminants attached to the surface are decomposed, and the activation causes the surface to have a contact angle with water. Hydrophilization is performed to about 0 to about 20 degrees, and contaminants are less likely to adhere due to the hydrophilicity, and even if they adhere, they can be easily washed away by rainfall or the like.

The ultraviolet light for activating the titanium dioxide may be installed on a road and received from sunlight. However, the ultraviolet light is previously radiated by a black light or the like in a factory or the like, and the ultraviolet light is installed outdoors. In this case, the coating 5 may be made hydrophilic by activating the titanium dioxide.

The coating 5 containing titanium dioxide as a photocatalyst may be formed directly on the front plate 1, but a strong oxidizing power due to the activity of titanium dioxide is formed between the front plate 1 and the coating 5 by a siloxane bond. If the undercoat layer 6 made of a silicone-based paint that is not easily attacked is formed, the front plate 1 made of an aluminum alloy plate, a synthetic resin plate, or the like will not be attacked by the activation of titanium dioxide. When the silicone-based compound is used as a binder for the titanium-containing coating 5, the undercoat layer 6 and the coating 5 become the same type of coating, so that the coating 5 can be firmly adhered to the undercoat layer 6.

The silicone-based coating for forming the undercoat layer 6 is not particularly limited. For example, an organic silicon compound having a siloxane bond as a main chain such as a silicone resin alone or an organic silicon compound and an alkyd, epoxy, acrylic, polyester, or phenol Sol, a silicone-modified sol obtained by reaction with a modified organic substance such as melamine, urethane, etc., but when the front plate 1 is formed of a synthetic resin plate or the like having poor heat resistance, It is commercially available as a so-called silicone hard coat agent in which a silicone compound is dissolved in an alcohol-based solvent that has extremely high properties (curability), cures at a relatively low temperature around 100 ° C, and does not easily attack synthetic resins. It is preferable to use one that is This silicone hard coat agent is mainly composed of a polyfunctional siloxane and forms a hard thin film by a dehydration condensation reaction of silanol groups, and is mainly used for improving abrasion resistance of a polycarbonate or acrylic resin surface. What is used. Examples of such a silicone hard coating agent include Tosgard 5 manufactured by Toshiba Silicone Co., Ltd.
And 10 (PH91 manufactured by the company as a curing agent).

[0018]

Embodiments of the present invention will be described below.

(Example) A front plate having a large number of apertures was prepared from an aluminum alloy plate, and a silicone-based paint was applied to the front plate by dipping. An undercoat layer of a paint was formed. Next, a coating composition containing titanium dioxide using silicone as a binder was applied on the undercoat layer by dipping, and the coating composition was dried at 100 ° C. in an atmosphere.
After heating and curing for a time, a film containing titanium dioxide as a photocatalyst was formed. Further, this film was irradiated with ultraviolet light at an illuminance of 1.0 mW / cm ² for 10 hours using a black light to activate titanium dioxide to make its surface hydrophilic, which was used in the present invention. A face plate was created.

(Comparative Example) Using a front plate made of an aluminum alloy plate as it is, a front plate as a comparative example was formed without forming a coating containing titanium dioxide as a photocatalyst. Ultraviolet light was irradiated using a black light in the same manner as in the example.

In the above Examples and Comparative Examples, first, the contact angle with water immediately after irradiation with ultraviolet light by black light was measured, and exposed to the outdoors.
The color difference (ΔE) after the passage of days 7, 7, 11, 19, 29 and 40 was measured, and the results are shown in Table 1.

The contact angle with water was measured using a contact angle meter (trade name: Model CA-X150, manufactured by Kyowa Interface Science Co., Ltd.) at room temperature by a droplet method. The color difference (Δ
In (E), three arbitrary points were measured by a colorimeter.

[0023]

[Table 1]

From the results shown in Table 1, the contact angle with water immediately after irradiation with ultraviolet light by black light is about 5 degrees in the example and 75 degrees in the comparative example. It is confirmed that it has been hydrophilized.

When the color differences are compared, the Example is maintained in a good state even after 40 days, and the surface is owed to the activation by the titanium dioxide and the hydrophilicity by the activation. It is confirmed that contaminants are less likely to adhere.

[0026]

According to the present invention, since a film that has been hydrophilized by activating titanium dioxide as a photocatalyst is formed on the surface of the front plate, contaminants such as dust and vehicle exhaust gas are eliminated. Even if it adheres to the front panel, the strong oxidizing power of the activated titanium dioxide decomposes the contaminants, and the hydrophilic surface causes water to break between the contaminants adhering to the surface and the surface. Since the contaminants are hardly attached to float, and even if the contaminants are attached, they are easily washed away and removed by rainfall or the like, so that the contaminants are hardly attached, and the aesthetic appearance of the front panel can be maintained in a good state for a long time.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a perspective view of a main part in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front plate 11 Opening 2 Back plate 3 Hollow panel body 4 Sound absorbing material 5 Coating 6 Undercoat layer

Claims (3)

[Claims] 1. A soundproof panel in which a sound absorbing material is provided inside a hollow panel formed by a front plate and a back plate having a large number of openings, wherein the front plate has titanium dioxide as a photocatalyst on its surface. Is formed, and by irradiating the coating with ultraviolet light, the titanium dioxide is activated to hydrophilize the surface, and contaminants attached to the surface due to rainfall or the like are washed. A self-cleaning soundproof panel characterized by the following. 2. The self-cleaning soundproofing panel according to claim 1, wherein an undercoat layer made of a silicone-based paint is formed between the front plate and a film containing titanium dioxide as a photocatalyst. 3. The coating containing titanium dioxide as a photocatalyst is formed by applying a coating composition comprising a mixture of a hydrolyzate of alkoxysilane and titania sol. The self-cleaning soundproof panel according to 1 or 2.