JP3017733B1 - Electromagnetic wave shield material with vibration damping and sound insulation - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a shielding material capable of simultaneously achieving vibration damping and sound shielding and electromagnetic wave shielding with one material. SOLUTION: A vibration damping sound insulating layer formed by kneading asphalt modified with a synthetic rubber or a synthetic resin and a high specific gravity filler, and a synthetic fiber non-woven cloth or a non-woven fabric adhered on one side of the vibration damping sound insulating layer The laminated structure has a three-layer structure consisting of a protective layer made of paper and an electromagnetic wave shielding layer made of a thin low-carbon steel sheet adhered to the other side surface of the vibration damping layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a factory, an office,
The present invention relates to an electromagnetic wave shielding material having suitable vibration damping and sound insulating properties for use in a house or the like to achieve vibration damping and sound insulation in a room or to shield electromagnetic waves.

[0002]

2. Description of the Related Art In recent years, various electric appliances and electronic devices have been remarkably spread in factories, offices, general houses, and the like. These electronic devices emit vibrations, noises, or electromagnetic waves. The effect of this on the human body is a problem. These vibrations, noise, electromagnetic waves, etc. enter the building not only from inside the building but also from outside as low-frequency vibrations, noise from vehicles running on highways, or electromagnetic waves from high-voltage wires. ing.

[0003] Conventionally, as a material for soundproofing indoor vibration damping in factories, offices, houses and the like, a binder such as synthetic rubber or synthetic resin or asphalt or the like is used as a high specific gravity filler such as iron sand, slag, iron powder or the like. Are known, in which a protective layer is formed on both sides of the substrate. Further, the electromagnetic wave shielding material reflects or absorbs electromagnetic waves, and an oxidation-resistant metal foil, a metal plate, a conductive woven sheet, and the like are known.

[0004]

Conventionally, one or both of the above-mentioned vibration damping materials and electromagnetic wave shielding materials are separately attached or laid on a wall, a floor, a roof, a ceiling, or the like as required. However, due to the remarkable spread of various electric appliances and electronic devices as described above, it is increasingly necessary to simultaneously control the vibration and noise of the room and shield the electromagnetic waves. Room walls and floors, roofs,
Affixing or laying on a ceiling or the like is troublesome and troublesome, and has a problem that the construction cost is high.

An object of the present invention is to provide a shielding material which can simultaneously perform vibration damping and sound shielding and electromagnetic wave shielding with a single material.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a vibration-damping and sound-insulating layer formed by kneading asphalt modified with synthetic rubber or synthetic resin and a high specific gravity filler. A protective layer made of synthetic fiber non-woven cloth or paper stuck on one side of the vibration damping layer, and an electromagnetic wave shielding layer made of a thin low carbon steel sheet stuck on the other side of the vibration damping layer. It is characterized by.

At this time, the present invention provides a mixing ratio of synthetic rubber or synthetic resin and asphalt in a weight ratio of 8:92 to 35:
The mixing ratio of the asphalt to the high specific gravity filler is preferably 10:90 to 50:50 by weight.
It is desirable to be within the range.

Further, in the present invention, it is desirable that the low-carbon steel sheet contains 0.1% or less by weight of carbon, and its thickness is preferably 0.1 mm or less.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of an electromagnetic wave shielding material having vibration damping and sound insulation according to the present invention.
The central part is formed by the vibration damping sound insulation layer 1. The vibration-damping and sound-insulating layer 1 has a specific gravity of, for example, iron sand, slag, or iron powder having a large specific gravity of 4.0 to 5.5 and a particle size of 2 mm or less, and is appropriately combined or mixed. And a modified asphalt mixed at a weight ratio of 50:50, and a protective layer 2 made of a nonwoven fabric such as a synthetic fiber is adhered to one side thereof. Damping sound insulation layer 1
On the other side, a low-carbon steel plate is stuck and an electromagnetic wave shielding layer is formed. Thus, the electromagnetic wave shielding material having vibration damping and sound insulating properties according to the present invention includes a vibration damping sound insulating layer 1 in the center, a protective layer on one side covering both sides, and an electromagnetic wave shielding layer covering the other side. It has a triple structure consisting of three layers.

The modified asphalt constituting the vibration damping layer 1 is styrene-butadiene-styrene rubber (SBS),
Styrene / isoprene / styrene rubber (SIS) Thermoplastic synthetic resin obtained by mixing asphalt with thermoplastic synthetic rubber such as styrene / ethylene / styrene rubber (SEBS) or asphalt such as atactic polyethylene (APP) And asphalt were used.

The compounding ratio between the modified asphalt and the high specific gravity filler is 50:50 by weight in the above embodiment.
Although it was 50, this can be arbitrarily selected between 10:90 by weight.

Further, in the low carbon steel sheet used as the electromagnetic wave shielding layer, the carbon content is desirably 0.1% by weight or less, and when it is 0.1% or more, the electromagnetic wave shielding effect is reduced. Further, the thickness is preferably 0.1 mm or less,
If the thickness is more than this, the rigidity in the construction work will be large, the adaptability to the construction base is poor, and the adhesion between the layers will be poor. Further, the cutting workability is deteriorated. Since the electromagnetic wave shielding layer is required to have an electromagnetic wave shielding property, a copper foil, a nickel plate, or the like can be used, but the cost is high and it is not practical. In addition, heating and pressurization of the vibration damping layer,
The above-described low carbon plate was the most suitable for smoothly producing a product having a uniform thickness at the time of processing.

Next, in the production method, the above-mentioned mixture of synthetic rubber or synthetic resin and asphalt and the high specific gravity filler are uniformly dispersed at a temperature of 100 to 150 ° C. using a Warner mixer. The mixture is kneaded to form a sheet having a predetermined thickness through two calender rolls. The temperature of the roll using a nonwoven fabric such as synthetic fiber as a protective material is set to 100 ° C. or less, and the low carbon steel sheet side When the roll temperature is formed at a temperature of about 150 ° C., an electromagnetic wave shielding material having good adhesion to a protective material and a low carbon steel plate and having a smooth surface finish and having vibration damping and sound insulation properties can be obtained.

Although the protective layer is formed of a nonwoven fabric such as a synthetic fiber in the above embodiment, it may be formed of paper.

FIG. 2 shows a form of the electromagnetic wave shielding material 4 having the vibration damping and sound insulating properties manufactured as described above. The one shown in the drawing is mainly used for attaching to a wall surface and has a thickness of 2 mm. 910 mm in width are rolled. When this is attached to a wall surface, it is cut into appropriate lengths and fixed on the ground by nails or the like.

FIG. 3 shows a form of the electromagnetic wave shielding material 5 having a vibration-damping and sound-insulating property when laid mainly on a floor surface. The thickness is selected to be 4 mm, 8 mm, 10 mm, etc., and the size is 4 mm.
A plate-like material having a size of 50 mm x 910 mm or 910 mm x 910 mm is laid and used below the floor finishing material.

The thickness 2.6 mm manufactured as described above
Of the sound pressure level when the shielding material of the above was used as a partition material with a comparative material in which the high specific gravity filler was changed to calcium carbonate powder.
The results of measuring the bell difference are shown in the following table.

[0018]

[Table 1]

Next, as a comparative material, a material was prepared by changing the above-mentioned low carbon steel sheet to aluminum, iron and copper foil, and K
When the shielding effect of the electromagnetic wave was measured according to the EC method, the results as shown in the following table were obtained.

[0020]

[Table 2]

As is clear from the above measurement results, the electromagnetic wave shielding effect was greater than that of a metal sheet made of aluminum, iron, or the like, and an electromagnetic wave shielding property close to that of a high-priced copper foil was obtained.

[0022]

The present invention is configured as described above.
It can be made into a thin sheet or a plate of various thicknesses and sizes. It can be used as a wall or floor in a factory, office, or general house, or ceiling or roof. By sticking or laying it on the floor, it is possible to achieve the vibration and noise insulation of the room and shield the electromagnetic waves at the same time in one process, so that the people in the room are affected by vibration, noise or electromagnetic waves. Can be prevented as much as possible.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of an electromagnetic wave shielding material having vibration damping and sound insulation according to the present invention.

FIG. 2 is a perspective view showing a product form of an electromagnetic wave shielding material having vibration damping and sound insulation according to the present invention.

FIG. 3 is a perspective view showing another product form of the electromagnetic wave shielding material having vibration damping and sound insulating properties according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Damping sound insulation layer 2 Protective layer 3 Electromagnetic wave shielding layer 4 Electromagnetic wave shielding material having vibration damping and sound insulation 5 Electromagnetic wave shielding material having vibration damping and sound insulation

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 9/00

Claims (5)

(57) [Claims] 1. A vibration damping layer formed by kneading asphalt modified with synthetic rubber or synthetic resin and a high specific gravity filler, and a synthetic fiber non-woven cloth adhered to one side of the vibration damping layer. Alternatively, an electromagnetic wave shielding material having vibration damping and sound insulating properties, comprising: a protective layer made of paper; and an electromagnetic wave shielding layer made of a thin low-carbon steel sheet adhered to the other side surface of the vibration damping sound insulating layer. 2. The electromagnetic wave shield according to claim 1, wherein the mixing ratio of the synthetic rubber or the synthetic resin and the asphalt is in the range of 8:92 to 35:65 by weight. Wood. 3. The vibration damping sound according to claim 1, wherein a mixing ratio of the asphalt and the high specific gravity filler is in a range of 10:90 to 50:50 by weight. Electromagnetic wave shielding material with properties. 4. The electromagnetic wave shielding material having a vibration-damping and sound-insulating property according to claim 1, wherein the low-carbon steel sheet contains carbon in a weight ratio of 0.1% or less. 5. The electromagnetic wave shielding material having a vibration damping and sound insulating property according to claim 1, wherein the low carbon steel sheet has a thickness of 0.1 mm or less.