JP3072438B2 - Highly water-resistant sound-insulating material and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure-resistant sound-insulating material suitable as a sound-insulating material for underwater acoustic equipment, for example, and to a method for producing the same.

[0002]

2. Description of the Related Art FIG. 5 is a cross-sectional view showing the structure of a conventional high-water-pressure sound-insulating material disclosed in, for example, JP-A-1-97996.

In FIG. 1, reference numeral 1 denotes a high-strength hollow sphere made of glass, synthetic resin, or the like and in which air 2 is sealed, the surface of which is covered with a viscoelastic material 3 having a uniform thickness. Reference numeral 4 denotes a mold rubber in which a large number of hollow spheres 1 are closely adhered to each other and are densely accumulated and sealed. The air 2 is sealed not only inside the hollow sphere 1 but also between the contact points of the viscoelastic material 3 when the hollow sphere 1 is accumulated by the mold rubber 4.
The viscoelastic material 3 can vibrate due to the gap 2a between these contact points, and can attenuate the transmitted sound.

[0004] The conventional high water pressure-resistant sound insulating material having such a structure has a strong structure even under high water pressure resistance, and even if sound is converted into vibration of the hollow sphere 1, the layer of the viscoelastic material 3 vibrates. And the vibro-acoustic conversion is not performed again.

[0005]

However, as described above, there is a conventional high water pressure soundproofing material in which individual hollow spheres 1 are integrated after their surfaces are individually covered with a viscoelastic material 3 as described above. Since the hollow spheres 1 are not directly connected to each other via the viscoelastic material 3, it is necessary to seal the outside of the hollow spheres 1 with a mold rubber 4 for each fixed unit. For this reason, when sound insulation in a large area is considered, as shown in FIG. 6, it is inevitable that the molded rubber block (hereinafter, simply referred to as a block) 5 is combined, and as a result, in the direction in which the sound propagates. The occupied area of the end portion of the block where the hollow sphere 1 or the void portion 2a is not interposed is large, and there is a problem that sound is transmitted from the end portion of the block.

Further, since the hollow sphere 1 is covered with the viscoelastic material 3,
The diameter of the hollow sphere 1 that can be actually constructed is required to be at least about 1 mm, and there is a problem that the size of the hollow sphere 1 is limited and the cost is high.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a highly water-resistant sound-insulating material capable of reliably preventing sound transmission and enabling the use of minute hollow spheres, and a method of manufacturing the same.

[0008]

According to the present invention, there is provided a high-pressure and water-resistant sound-insulating material comprising a viscoelastic material formed into a thin sheet in which hollow spheres are dispersed, and a desired number of viscoelastic materials formed in the sheet shape. The sheets are laminated and bonded to each other by vulcanization or heat fusion in a state where a void portion is formed in the hollow sphere connecting portion when viewed in plan view between the sheet-shaped viscoelastic materials.

Further, the method for producing a high water-pressure and sound-insulating material according to the present invention is characterized in that a paste made of a thermoplastic viscoelastic material or a thermosetting viscoelastic material dissolved in a solvent is made of glass or synthetic resin. A first step of dispersing the spheres and forming the first sheet by blade coating, screen printing, or the like, and drying the first sheet to remove the solvent, thereby reducing the volume of the viscoelastic material. A second step of obtaining a second sheet in which concave portions along the hollow sphere are formed on the upper and lower surfaces of the hollow sphere connecting portion in the viscoelastic material, and after stacking a plurality of second sheets, the second step By bonding or heating and fusing the sheets, the third sheets are joined to each other in a state in which a hollow portion is formed in the hollow sphere connection portion when viewed in plan view between the second sheets. And a step of:

[0010] In the method for producing a high water pressure and sound insulation material, the thickness of the first sheet may be 1 to 1.5 times the diameter of the hollow sphere.
It is characterized by being set to double.

[0011]

According to the present invention, the viscoelastic material is formed into a thin sheet in which hollow spheres are dispersed, and a desired number of the viscoelastic materials formed in the sheet shape are laminated, and then these sheets are vulcanized. Or, by heating and fusing, the two sheets are joined in a state where a void is formed in the hollow sphere connection part when viewed in plan view, so a large area high water pressure soundproofing material using minute hollow spheres As a result, sound transmission can be reliably prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to one embodiment of FIGS. FIG. 1 is a cross-sectional view showing the structure of the high-water-pressure and sound-insulating material according to the present embodiment, and FIGS. 2 to 4 are explanatory views of the steps of the manufacturing method.

In FIG. 1, reference numeral 8 denotes a high water pressure and sound insulating material, and its viscoelastic material 3 is initially formed in a thin sheet shape in which hollow spheres 1 are dispersed, and the viscoelastic material formed in this sheet shape is used. A desired number of sheets are laminated and joined together by vulcanization (heat curing) or heat fusion in a state in which a hollow portion 2a is formed at a hollow sphere connection portion between the sheet-like viscoelastic materials in a plan view. It is.

This will be described in detail according to the manufacturing procedure. First, the viscoelastic material 3 made of a thermoplastic viscoelastic material or a thermosetting viscoelastic material is dissolved in a solvent to form a paste. Next, the hollow spheres 1 made of glass or synthetic resin are dispersed in the paste-like viscoelastic material 3, and a sheet is formed on a peelable base by blade coating, screen printing, or the like. At this time, if the sheet thickness is set to about 1 to 1.5 times the diameter of the hollow sphere 1, a first sheet 6 in which the hollow spheres 1 are arranged in a plane is obtained (FIG. 2).

Next, when the first sheet 6 is dried and the solvent is removed, the volume of the viscoelastic material 3 decreases, and the upper and lower surfaces of the viscoelastic material 3 between the hollow spheres 1 (hollow sphere connecting portions) Hollow sphere 1
2 is obtained (FIG. 3).

Next, after the base is peeled off from the second sheet 7 and removed, a plurality of second sheets 7 are laminated (FIG. 4).

After that, the laminated second sheets 7 are vulcanized (heat-cured) or heat-fused, and when the second sheets 7 are joined, the hollow sphere connecting portion of the viscoelastic material 3, that is, sound propagates. A high water pressure-resistant and sound-insulating material 8 in which a cavity 2a is formed in a portion where the hollow sphere 1 is not interposed in the direction is obtained (FIG. 1).

In the high water pressure and sound insulation material of the present embodiment manufactured by the above-described manufacturing method, the rate of volume reduction of the viscoelastic material 3 in the form of paste is determined by the volume ratio of the solvent contained in the paste. Therefore, by adjusting the volume ratio of the solvent, the porosity after vulcanization (heat curing) or heat fusion, the viscoelastic material 3
Thickness can be selected. In addition, the thickness of the entire high water pressure and sound insulation material 8 can be selected according to the number of stacked second sheets 7.

Since each hollow sphere 1 is not covered with the viscoelastic material 3 as in the prior art, hollow spheres 1 of several microns can be used if necessary, thereby improving the water pressure resistance. Can be expected.

[0020]

As described above, according to the present invention, the viscoelastic material is formed into a thin sheet having hollow spheres dispersed therein.
A desired number of the sheet-shaped viscoelastic materials are laminated,
After that, these sheets are vulcanized or heated and fused,
Since the sheets are joined in a state in which a hollow portion is formed in the hollow sphere connecting portion when viewed in plan view, hollow spheres of several microns can be used as necessary, and the water pressure resistance is improved, There is an effect that a large-area sound insulating material can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure of a high water pressure and sound insulation material according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a first step of a method for producing a high water pressure and sound insulation material according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram for explaining a second step of the method for manufacturing a high water pressure and sound insulation material according to one embodiment of the present invention.

FIG. 4 is an explanatory diagram for explaining a third step of the method for manufacturing a high water pressure and sound insulation material according to one embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a structure of a conventional high water pressure and sound insulation material.

FIG. 6 is a cross-sectional view showing a combination example of a conventional high water pressure and sound insulation material.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 hollow sphere 2 air 2 a void 3 viscoelastic material 6 first sheet 7 second sheet 8 high water-resistant sound-insulating material

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-1-116698 (JP, A) JP-A-1-97996 (JP, A) JP-A-2-278293 (JP, A) JP-A-51- 40959 (JP, A) Fully open sho 59-102335 (JP, U) Fully open sho 62-53376 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) G10K 11/16-11 / 178

Claims (3)

(57) [Claims] 1. A high water pressure and sound insulation material in which a number of hollow spheres made of glass or epoxy resin are dispersed in a thermoplastic viscoelastic material or a thermosetting viscoelastic material. A desired number of viscoelastic materials formed in a sheet shape are dispersed in a thin sheet, and a desired number of the viscoelastic materials are laminated, and vulcanized or heated and fused to form hollow spheres between the sheet-shaped viscoelastic materials in plan view. A highly water-resistant and sound-insulating material, which is joined to each other in a state where a gap is formed in a connecting portion. 2. A hollow sphere made of glass or synthetic resin is dispersed in a thermoplastic viscoelastic material or a thermosetting viscoelastic material dissolved in a solvent to form a paste, and the first sphere is formed by blade coating, screen printing or the like. A first step of forming the first sheet, and drying the first sheet to remove the solvent,
A second step of obtaining a second sheet in which the volume of the viscoelastic material is reduced and concave portions along the hollow sphere are formed on the upper and lower surfaces of the hollow sphere connecting portion in the viscoelastic material; After laminating a plurality of layers, these second sheets are vulcanized or heat-fused to form a hollow portion in the hollow sphere connecting portion when viewed in a plane between the second sheets. And a third step of joining the second sheets to each other. 3. The thickness of the first sheet is 1 to 1 of the diameter of the hollow sphere.
3. The method according to claim 2, wherein the ratio is set to 1.5 times.