JP2647299B2 - Transparent sound insulation board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent sound insulating plate used for soundproof walls, soundproof windows, soundproof enclosures, etc., on roads and buildings.

[0002]

2. Description of the Related Art Conventionally, a transparent resin plate such as polycarbonate is generally known as a transparent sound insulation plate used for a soundproof wall or the like. Further, as disclosed in Japanese Patent Application Laid-Open No. 61-149996, there has been proposed a soundproof panel in which a single-layer silicon gel layer is laminated and integrated between two translucent plates made of an acrylic resin, a glass plate or the like. ing.

[0003]

However, in the case of a single transparent resin plate such as polycarbonate, there is a problem that a sound wave of noise propagates through the transparent resin plate, so that the sound insulation effect becomes insufficient. In addition, when a single layer of a silicon gel layer is laminated and integrated between light-transmitting plates, the silicon gel layer vibrates due to sound waves of noise, converts noise energy to heat energy and attenuates, and attenuates the transparent resin plate alone. Although the sound insulating effect can be improved as compared with the conventional one, there is a problem that resonance occurs in a part of the frequency range and the sound insulating performance is reduced, so that a good sound insulating effect cannot be exhibited over the entire frequency range.

An object of the present invention is to provide a transparent sound insulating plate which has solved the conventional problems.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have made intensive studies and as a result, by laminating at least two types of transparent gel layers having different elasticity between transparent plates, transmission loss is remarkably increased. The present inventors have found that the sound insulating effect is improved by increasing the amount, and the present invention has been completed.

That is, the transparent sound insulating plate of the present invention has at least two transparent gel layers made of an elastic polymer that transmits visible light and is laminated between two transparent plates. It was done differently.

[0007]

The transparent gel layer is vibrated by the sound wave of the noise, the noise energy is converted into vibration energy, and further converted into heat energy by the resistance of the transparent gel layer and consumed, whereby the noise is attenuated. At the same time, the resonance points of the transparent gel layers are absorbed by the transparent gel layers having different elasticities, and good sound insulation performance is exhibited over the entire frequency range.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a transparent plate, which is generally a plate made of a transparent resin such as polycarbonate or acrylic resin, but may be a glass plate or the like. Transparent plate 1
Is formed in an appropriate shape such as a square, and a material having a thickness of about 1 to 10 mm is preferably used. Further, two transparent plates 1 are laminated via a transparent gel layer 2 as described later, but both may be the same type of plate or different types of plates.

A plurality of transparent gel layers 2 are laminated and integrated between two transparent plates 1 so that the elasticity of each transparent gel layer 2 is different. For example, in the case of FIG. 1, two transparent gel layers 2 having different elasticities are provided, but two or more transparent gel layers may be provided. The transparent gel layer 2 is formed of, for example, a transparent, adhesive and elastic polymer capable of transmitting visible light, such as a silicone gel or an acrylic gel. The transparent gel layer 2 is formed of the above-mentioned polymer, and is capable of effectively converting vibration energy due to noise into heat energy.

The elasticity of the transparent gel layer 2 has a viscosity of 200 to 500.
The range is about 00 cp. For example, when the transparent gel layer 2 has two layers, one having a viscosity of 200 to 3000 cp and one having a viscosity of 3000 to 50,000 cp are laminated,
In the case of three layers, one having a viscosity of 200 to 3000 cp, one having a viscosity of 3000 to 10,000 cp, and one having a viscosity of 10,000
５０50000 cp are laminated.

With regard to the elasticity of the transparent gel layer 2, if the viscosity is too low, it is too close to the solution and the elasticity is too low to form a laminated board. On the contrary, if the viscosity is too high, it is close to the solid and the elasticity is low. It is preferable to use a material having a viscosity in the range of about 200 to 50,000 cp because it cannot exert a noise attenuation effect. Further, the combination of elasticity of each transparent gel layer 2 is not limited to the above example, and the viscosity difference of each transparent gel layer 2 may be 500 to 100.
If 0 cp or more is applied, the resonance points of the transparent gel layers 2 can be absorbed by the transparent gel layers 2 to exert a noise attenuation effect, and various combinations may be appropriately made within the above range.

The total thickness of the plurality of transparent gel layers 2 is 0.1 to
It is preferably about 8 mm. The reason is that no improvement in transmission loss is recognized below 0.1 mm,
This is because the noise attenuation effect does not improve any more even if the distance is m or more, and the noise leveling-off is made flat. The thickness of each transparent gel layer 2 is 0.0
It is preferable that the distance is about 5 to 7.95 mm. The reason is that when the thickness is 0.05 mm or less, the effect due to the lamination is not recognized, and when the thickness is 7.95 mm or more, the noise attenuation effect is not improved and the leveling is performed.

The thickness of each transparent gel layer 2 may be the same or different. In addition, each transparent gel layer 2 is preferably formed of the same type of polymer, but may be formed of different types of polymers having adhesiveness to each other.

Next, as the transparent sound insulating plate of the present invention, between each two polycarbonate plates having a thickness of 2 mm, each having a different elasticity is used.
The transmission loss was measured for a two-layer silicon gel layer having a thickness of 5 mm (Example), and the result was shown in FIG.
It was shown to.

At this time, the first silicon gel layer is a low elasticity sill pot 300A & B (manufactured by Dow Corning).
Sill pot 300A solution 50%, sill pot 3
00B liquid is mixed at a ratio of 50% and cured, and the viscosity is 400
cp. For the second silicon gel layer, a highly elastic sill pot 184 (manufactured by Dow Corning) was used, and the mixture was cured by mixing at a ratio of 99% of the sill pot 184 base material and 1% of the sill pot 184 curing agent to have a viscosity of 5,500 cp.

As a comparative example, a 1 mm thick silicon gel layer was laminated and integrated between two 2 mm thick polycarbonate plates (Comparative Example 1) and a 5 mm thick polycarbonate plate alone (Comparative Example 2) 2), the transmission loss was measured, and the results are also shown in FIG. The silicon gel layer of Comparative Example 1 was cured using a sill pot 184 (manufactured by Dow Corning) at a ratio of 99% of the sill pot 184 base material and 1% of the sill pot 184 curing agent.
The viscosity was set to 5500 cp.

As can be seen from FIG. 2, the embodiment exhibited an excellent sound insulation effect over the entire frequency range.
Is generally inferior to the embodiment, and especially frequency 2
At KHz, the transmission loss decreases and becomes worse than Comparative Example 2,
It was confirmed that Comparative Example 2 was generally inferior to Examples and Comparative Example 1.

[0018]

As described in detail above, the transparent sound insulating plate of the present invention comprises a plurality of transparent gel layers laminated and integrated between two transparent plates so that the elasticity of each transparent gel layer is different. Therefore, the noise is attenuated by the transparent gel layer, and at the same time, the resonance points of the transparent gel layer are absorbed by the transparent gel layers, so that good sound insulation performance can be exhibited over the entire frequency range, and the sound insulation effect is improved. be able to.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing one embodiment of the transparent sound insulating plate of the present invention.

FIG. 2 is a graph showing transmission loss measurement results of the transparent sound insulating plate of the present invention and a conventional transparent sound insulating plate.

[Explanation of symbols]

 1 Transparent plate 2 Transparent gel layer

Claims (1)

(57) [Claims] 1. A transparent sound insulation in which at least two transparent gel layers made of a polymer that transmits visible light and has elasticity are laminated between two transparent plates, and each transparent gel layer has a different elasticity. Board.