JPH0624933U - Composite soundproof structure - Google Patents

Abstract

(57) [Abstract] [Purpose] An object is to provide a composite soundproof structure having a high soundproofing effect from a low frequency range to a high frequency range. [Structure] Foamed silicone 3 close to the noise source 4
And the sound insulation plate 1 provided in close contact with the outside of the glass wool 2, and the foaming silicone 3 has an expansion ratio of 3 to 15, preferably 3 .About.6 times.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a soundproof structure that covers a noise source and makes it difficult for noise to radiate outside.

[0002]

[Prior art]

 Conventionally, soundproof materials such as glass wool, resin foam, and asphalt have been used for soundproofing noise sources. In particular, glass wool is used in various fields due to its heat resistance and low price. As a method of using it, a composite soundproofing material in which a glass wool molded product is attached to a sound insulation plate, or a composite soundproofing material in which the periphery of the glass wool is surrounded by a rubber molded product 5 which also serves as a sealing material as shown in Fig. 5 is used. It was

For the resin foam of the composite soundproof material, the vibration damping material instead of glass wool, and the sound insulation plate, the composite soundproof material in which various kinds of materials are combined has been used.

[0004]

[Problems to be solved by the device]

 However, glass wool, which is used as an excellent soundproofing material, has a difficulty in moldability, and it is difficult to mold it neatly into the shape desired by the user, and particularly to mold it into a three-dimensional shape with a constant density. Is.

Further, since it is covered with an aluminum film or the like due to the problem of water resistance, and this work is carried out manually, the cost is high and the effect of glass wool on the human body cannot be ignored.

Further, although glass wool has excellent soundproofing characteristics in the low frequency range (200 to 600 Hz), it has a drawback that the soundproofing effect is low in the middle and high frequency ranges (800 to 5000 Hz).

On the other hand, a resin foam used as a soundproof material has good soundproofing characteristics in a high frequency range (2000 to 5000 Hz), but has a low soundproofing effect in a low / medium frequency range. Therefore, there is a drawback that the mechanical strength is low.

An object of the present invention is to solve these drawbacks and to provide a composite soundproof material having a high soundproofing effect from a low frequency range to a high frequency range.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the composite soundproof material, the foamed silicone 3 that is in close contact with the noise source 4, the glass wool 2 that is provided in close contact with the outside of this foamed silicone 3, and the outside of this glass wool 2 are provided. The sound insulating plate 1 is provided in close contact with the foamed silicone 3, and the foaming ratio of the foamed silicone 3 is 3 to 15 times, preferably 3 to 6 times.

[0010]

[Action]

 The foamed silicone, which is in close contact with the noise source, has a high soundproofing effect in the high frequency range, and the glass wool between the sound insulation plate and the sound insulating plate exhibits a high soundproofing effect in the low frequency range on the outside. Exert.

[0011]

【Example】

 FIG. 1 is a sectional view of the composite soundproof plate of the present invention. The glass wool 2 is directly bonded to the sound insulation plate 1 and covered with the foamed silicone 3. The foamed silicone 3 is in close contact with the noise source 4.

Further, the foamed silicone 3 is a waterproof material for the glass wool 2 due to its water repellency. Further, the foamed silicone 3 includes an open-cell type and a closed-cell type, but the open-cell type is preferable in terms of moldability and soundproofing.

There are room-temperature curing type and heat-curing type as the curing and foaming method. Either of them may be used, but the foaming ratio of the foamed silicone is about 3 to 15 times, and considering its moldability and strength of the molded product. A foaming ratio of about 3 to 6 times is preferable.

In Experimental Example (1), a foamable silicone composition (trade name; Threebond 5277C manufactured by ThreeBond Co., Ltd.) was poured into a 600 × 600 mm molding die, and further 600 × 600 × 10 mm glass wool (area density 0.86 kg). / M ² ) and then covered with a mold lid. In this state, it was left standing for 10 minutes to foam and cure the foamed silicone composition. The obtained glass wool / foamed silicone molded product was adhered to a 0.8 mm-thick steel plate with a silicone adhesive (trade name: SH4280 manufactured by Toray Dow) to give a thickness of 19.8 mm and an areal density of 10.2 kg / m ^2. To obtain a composite soundproof structure (Fig. 1). This sample was measured in the laboratory according to the sound transmission loss method (JIS A 1416). The measurement results are shown in the characteristic diagram of FIG.

As Comparative Example (2), a foamable silicone composition (trade name; Threebond 5277C manufactured by ThreeBond Co., Ltd.) was poured into a 600 × 600 mm molding die, and further 600 × 600 × 10 mm glass wool (area density 0.86 kg). / M ² ), the foamable silicone composition described above was further injected to make glass wool into a sandwich shape, and then the mold lid was covered. In this state, it was left standing for 10 minutes to foam and cure the foamed silicone composition. The thickness of the obtained glass wool / foamed silicone molded product was measured with a silicone adhesive (trade name; SH4280 manufactured by Toray Dow) to a thickness of 0. A composite soundproof structure (shown in FIG. 2) having a thickness of 19.8 mm and an areal density of 10.2 kg / m ² was obtained by adhering to a steel plate of 8 mm. This sample was measured in the laboratory according to the sound transmission loss method (JIS A 1416). The measurement results are shown in the characteristic diagram of FIG.

As Comparative Example (3), 600 × 600 × 10 mm glass wool (area density: 0.86 kg / m ² ) was placed in a 600 × 600 mm mold, and a foamable silicone composition (trade name; Threebond 5277C manufactured by ThreeBond Co., Ltd.) was used. ) Was poured into the mold and the mold lid was covered. In this state, it was left standing for 10 minutes to foam and cure the foamed silicone composition. The obtained glass wool / foamed silicone molded product was adhered to a 0.8 mm-thick steel plate with a silicone adhesive (trade name: SH4280 manufactured by Toray Dow) to give a thickness of 19.8 mm and an areal density of 10.2 kg / m ^2. A composite soundproofing structure of (FIG. 3) was obtained. This sample was measured in the laboratory according to the sound transmission loss method (JIS A 1416). The measurement results are shown in the characteristic diagram of FIG.

When the measurement results of the above-mentioned experimental example (1), comparative example (2), and comparative example (3) are compared with the soundproof characteristic diagram of FIG. 4, the transmission loss (sound absorption rate) is low in a low frequency range of about 400 Hz or less. ) Is not so different, but a large difference is recognized in the frequency range higher than this, and in particular, the difference from the comparative example (3) shown in FIG. 3 is large.

[0018]

[Effect of device]

 As described above, this composite soundproof structure has the following effects. That is, 1) Due to the water repellency of the foamed silicone used, there is no need for a rubber molding sealing material which is required when glass wool is used as a soundproof material. 2) Since the foam is in close contact and there is no gap between the composite soundproof structure and the noise source, the soundproofing effect is improved. 3) Since glass wool is contained as the core material, the foam can be easily handled. 4) The soundproofing property in the middle frequency range, which is a defect of the foam, is remarkably improved. 5) The density of the foam part can be made constant.

[Brief description of drawings]

FIG. 1 is a sectional view of a composite soundproof plate of the present invention.

FIG. 2 is a sectional view of a comparative example (2) of the composite soundproof plate.

FIG. 3 is a sectional view of a comparative example (3) of the composite soundproof plate.

FIG. 4 is a soundproof characteristic diagram of each composite soundproof structure.

FIG. 5 is a sectional view of a conventional composite soundproof plate.

[Explanation of symbols]

 1 Sound insulation board 2 Glass wool 3 Foamed silicone 4 Noise source

Claims (1)

[Scope of utility model registration request] 1. A composite soundproofing material comprising foamed silicone closely contacting a noise source, glass wool closely contacted to the outside of the foamed silicone, and a sound insulation plate closely contacted to the outside of the glass wool. A composite soundproof structure, wherein the foaming ratio of the foamed silicone is 3 to 15 times, preferably 3 to 6 times.