JPH07118593B2 - Reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet. More specifically, the present invention relates to a reinforced amorphous metal thin film laminated sheet having a surface which is soft and has appropriate compression elasticity and which has an excellent electromagnetic wave shielding property.

[0002]

2. Description of the Related Art In recent years, with the development and popularization of electronic devices, these devices, magnetic recording media, etc.
It is necessary to protect against the adverse effects of static electricity and electromagnetic waves, and as this protective material, sheet materials such as covering sheet materials and packaging sheet materials are in great demand.

In order to protect electronic equipment from the influence of static electricity, a conductive sheet containing a conductive material containing carbon powder, carbon fiber, metal foil or metal powder has been used. However, such a conventional conductive sheet cannot be said to be sufficiently effective for the purpose of protecting electronic devices from the influence of electromagnetic waves, and its deformation (flexibility) is insufficient, It was difficult to fit the shape of the equipment to be protected.

A laminated sheet having a film attached to a metal thin film having an electromagnetic wave shielding property has already been developed by the inventors of the present invention. However, the conventional metal thin film laminated sheet has a hard surface and poor elasticity. , Therefore, even if this laminated sheet is used for covering packaging of electronic equipment,
It does not fit these devices, and also has insufficient drapeability and cushioning properties. Moreover, the metal thin film is easily broken by bending and bending, creases remain, and laminated component layers peel from each other. Or partial whitening,
There were problems such as streaking.

[0005]

DISCLOSURE OF THE INVENTION The present invention has the problems of the conventional electromagnetic wave shielding metal thin film laminated sheet, namely,
Eliminates problems such as lack of surface flexibility and elasticity, breaking / breaking of metal thin film due to bending, and formation of folds, creases, whitening due to peeling between component layers, and unevenness of streaks However, it is possible to provide a reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet which has flexibility adaptability to shape deformation, good drapeability, good surface flexibility and compression elasticity, and is useful for equipment covering packaging. It is what

[0006]

A reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention is capable of solving the above-mentioned problems, and is an electromagnetic wave shielding amorphous metal thin film layer and this amorphous metal thin film layer. A cover layer made of a flexible material, the cover layer being bound to at least one surface of the metal thin film layer, and the amorphous metal thin film layer having a plurality of amorphous metal thin film ribbons arranged in parallel with each other. Formed, wherein at least one of the coating layers comprises a flexible polymeric foam porous material layer having a thickness of 0.5 to 100 mm, the coating layer further comprising a fiber fabric reinforcement layer. It is characterized by having.

In the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention, a coating layer made of a flexible material is bound to both surfaces of the amorphous metal thin film layer, and at least one of the coating layers can be formed. The flexible material may include a layer of flexible polymeric expanded porous material.

Further, in the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention, the coating layer bound on one surface of the amorphous metal thin film layer includes a flexible polymer foam porous material layer. Further, the coating layer bound to the other surface of the amorphous metal thin film layer may include a flexible polymer non-porous material layer.

An amorphous metal thin film is used in the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention. Recently, attempts have been made to use amorphous metals for various applications based on their properties.
Generally, an amorphous metal thin film has a width of 2.54 to 10.1.
It is supplied as a 6 cm ribbon-shaped material, and with regard to the expansion of its width, it is expected that a small width sheet with a width of 20.32 cm will be supplied in the near future.

Conventionally, the ribbon-shaped or small (narrow) width material as described above can be used only as a card case or as a packaging material for small articles, which is 100 to 300.
It was thought that it would be almost impossible to use it for a covering sheet that requires a wide width of cm.

The above-mentioned effect of protecting the electronic equipment means the effect that the electromagnetic wave energy is absorbed or reflected by the electromagnetic wave shield means so that the electronic equipment is not affected by the electromagnetic wave energy. The degree of electromagnetic wave energy attenuation by the electromagnetic wave shield means is expressed in a unit decibel (dB), and as the electromagnetic wave shield material has a larger value, the attenuation effect is larger, which is preferable.

In the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention, its electromagnetic wave shielding effect depends substantially on the shielding effect of the metal thin film contained therein, and in general, it is preferably 10 dB or more, It is more preferably 30 dB or more, further preferably 60 dB or more.

The amorphous metal thin film used in the present invention generally comprises iron as a main component and is obtained by adding one or more selected from boron, silicon, carbon, nickel, cobalt, molybdenum and the like. It is preferably selected from amorphous alloys. For example, the product name METGLAS No. 2605SC (Fe: 8) of Allied
1%, B: 13.5%, Si: 3.5%, C: 2% amorphous alloy), No. 2605S-2 (Fe: 78
%, B: 13%, Si: 9% amorphous alloy), N
o. 2605-CO (Fe: 87 parts, B: 14 parts, S
i: 1 part, Co: 18 parts amorphous alloy), No. 2
826-MB (Fe: 40%, Ni: 38%, Mo: 4
%, B: 18% amorphous alloy) or the like can be used.

In addition to the above-mentioned amorphous alloy system containing iron as a main component, an amorphous alloy system containing cobalt as a main component (for example, Co ₉₀ Zr ₁₀ , Co ₇₈ Si ₁₀ B ₁₂ , Co.
₅₆ Cr ₂₆ C ₁₈ , Co ₄₄ Mo ₃₆ C ₂₀ , Co ₃₄ Cr ₂₈ Mo ₂₀
C ₁₈ ), an amorphous alloy system containing nickel as a main component (for example, Ni ₉₀ Zr ₁₀ , Ni ₇₈ Si ₁₀ B ₁₂ , Ni ₃₄ Cr).
₂₄ Mo ₂₄ C ₁₈ ) and amorphous alloys containing other metals as main components (for example, Pd ₈₀ Si ₂₀ , Cu ₈₀ Z).
r ₂₀ , Nb ₅₀ Ni ₅₀ , Ti ₅₀ Cu ₅₀ ) and the like can also be used.

The amorphous metal thin film may be a perforated thin film as long as it does not substantially affect the electromagnetic wave shielding property.

Since these amorphous metal thin film materials are supplied in the form of ribbons or narrow sheets as described above, when they are used in the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention. A plurality of ribbon-shaped or narrow sheet-shaped amorphous metal thin film materials are arranged in parallel with each other to be used as a wide sheet-shaped body. In this case, the opposite side edges may be overlapped as necessary, and may be joined by an adhesive, preferably a conductive adhesive, or solder to form a wide sheet-like body having a desired width. In addition, the amorphous metal thin film may be formed using amorphous metal powder. Alternatively, it may be used as a knitted woven fabric-like or non-woven fabric-like sheet from thin wires made of amorphous metal, and this sheet may be used as an amorphous metal thin film.

The amorphous metal thin film as described above has a particularly excellent shield effect against a magnetic field.

In the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention, the amorphous metal thin film layer preferably has a thickness of 100 μm or less, more preferably 1 to 70 μm. More preferably, it has a thickness of ˜50 μm,
Even more preferably it has a thickness of 10 to 30 μm.

The thickness of the amorphous metal thin film layer is 100 μm
When it is larger than m, the rigidity of the core layer becomes excessively large, the core layer is hard to deform, the drape property becomes insufficient, and a sharp cut surface may be formed, which may be dangerous in operation. In addition, a thin protective film such as a rust preventive may be formed on the surface of the amorphous metal thin film layer or the metal plating layer thereof.

In the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention, a coating layer containing a flexible polymer foam porous material layer is bonded to at least one surface of the amorphous metal thin film layer. The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet coated with the coating layer including the flexible polymer foam porous material layer exhibits favorable flexibility, compressive elasticity, and cushioning property against impact and pressing.

That is, when an external force such as bending is applied to the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet, the flexible polymer foam porous material layer is deformed to absorb the external force and the amorphous metal The expansion and compression of the thin film are reduced, whereby the amorphous metal thin film is prevented from breaking and breaking, and permanent deformation (crease formation) is prevented. Such a reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet is useful as a sheet for covering electronic devices or a sheet for storing packages.

Suitable flexible polymeric materials for forming the flexible polymeric foamed porous material layer include natural rubber, synthetic rubber (eg, SBR, NBR, nitrile rubber, polychloroprene rubber, polyisobutylene rubber, fluorine). Rubber, silicone rubber, etc., which are often used in the latex state), and flexible synthetic resins (eg, polyethylene, polyurethane, polyvinyl chloride, and polystyrene), and the like. .
The flexible polymeric foam porous material layer may be a rigid foam as long as it is flexible, but is generally preferred to be a flexible foam.

The porosity of the flexible polymer foam porous material layer is preferably 50 to 99% (foaming ratio: 2 to 100 times), and 80 to 98% (foaming ratio: 5 to 50 times).
Is more preferable. Normally foaming ratio 20-60
Doubled one is used. The compression resistance of the flexible polymer foam porous material layer is 10 kg / cm at 25% compression.
If it is ² or less, it can be put to practical use depending on the use, but in general, it is preferably 0.5 kg / cm ² or less, and 0.1 kg / cm ² or less.
/ Cm ² or less is more preferable.

The thickness of the flexible polymer foam porous material layer is
It is in the range of 0.5 to 100 mm, preferably in the range of 1 to 50 mm, depending on the use of the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet. The flexible polymer foam porous material layer having such a thickness has a large curvature when the amorphous metal thin film layer is bent,
It is locally stretched to prevent it from tearing or breaking, and the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention exhibits excellent flexibility, compression elasticity and cushioning property as a whole. To be able to

The flexible polymer foam porous material layer of the covering layer is bonded to the amorphous metal thin film layer directly or through the flexible material, but a foam porous sheet is prepared beforehand. Alternatively, this may be bound with an adhesive, or the adhesive surface portion of the flexible polymer foam porous material layer may be heat-melted and fused. The flexible polymer foam porous material layer may be formed by chemically foaming on the amorphous metal thin film, or a polymer coating containing bubbles may be applied on the amorphous metal thin film, Solidify,
You may form by what is called a mechanical foaming method.

The coating layer including the flexible polymer foam porous material layer as described above may be formed on both sides of the amorphous metal thin film, or may be formed on only one side thereof. In the latter case, the coating layer containing the flexible polymer non-porous material layer as described above may be bonded to the other surface of the amorphous metal thin film layer.

The flexible polymer foam porous material layer and / or the flexible polymer non-porous material layer described above are laminated and bound with the fiber cloth reinforcing layer to form a coating layer. The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention having such a fiber cloth reinforcing layer is useful as an application requiring high mechanical strength, for example, a heavy packaging material or a heavy coating material. Is.

When the amorphous metal is formed into a thin film as described above, its tear strength is as low as almost 0, and the film is easily torn at a low load. Further, such an amorphous metal thin film is relatively weak in tensile strength and has a large variation in strength. For example, the tensile strength of an amorphous metal thin film having a thickness of 25 μm can be determined according to JIS-L-10
96 (1979), "General textile test method", 6.12,
Tensile strength and elongation 6.12.1 (1) Based on the A method (strip method), the tensile strength was measured under the conditions of width: 3 cm, gripping interval: 20 cm, and tensile speed: 200 mm / min. The length is 65-125kg / 3cm, average 100kg /
It is relatively weak, about 3 cm, and the measured values vary widely. Further, since the amorphous metal thin film is generally provided in the shape of a ribbon having a narrow width, if these are arranged in parallel and formed into a sheet, even if they are arranged on the opposite side edges by soldering, Even if bonded with an adhesive, the transverse tensile strength of this sheet is insufficient,
Moreover, there is a problem that the variation is large. Therefore, a reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet used for heavy packaging and heavy coating, or a reinforced electromagnetic wave shield used for applications where local friction or local external force acts. The amorphous amorphous metal thin film laminated sheet is reinforced by a fiber cloth reinforcing layer.

The tensile strength of the fiber cloth of the fiber cloth reinforcing layer is preferably higher than the tensile strength of the amorphous metal thin film layer. Such a fiber cloth reinforcing layer can reinforce the tensile strength of the amorphous metal thin film layer and reduce variations in the tensile strength.

Further, when a fiber cloth having a breaking elongation of 5% or less is used as the fiber cloth for the fiber cloth reinforcing layer, the difference in extensibility between the core layer and the fiber cloth reinforcing layer becomes small.
The S load curves are similar, so the base layer can exhibit relatively high tensile strength. Further, when a fiber sheet having a breaking elongation equal to that of an amorphous metal thin film or 5% or less is combined with the core layer as a fiber fabric reinforcing layer, only the amorphous metal ribbons are arranged in parallel in forming the core layer. The joining of the ribbons by solder or adhesive is not always necessary. Such a jointless amorphous metal thin film shows a good appearance with no visible seams.

As fibers constituting such a fiber cloth, fibers having a tensile strength of 130 kg / mm ² or more and a breaking elongation of 5% or less are preferable. There is no particular limitation on the type of fiber having such performance, but the following are exemplified. Tensile strength Breaking elongation Fiber (kg / mm ² ) (%) Glass fiber 350 to 600 3 to 4 Carbon fiber 200 to 300 1.5 to 0.5 Steel fiber 240 1.7 Aromatic aramid fiber 285 2. 0-5.0

These high-strength fibers are effective in achieving the above effects, but have low elongation and low flexural strength. Therefore, when high flex resistance is required for the application of the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet, a mixture of other fiber having high elongation and high flex strength with the above high strength fiber is used. Is preferred. There is no particular limitation on the kind of the high elongation fiber, but examples thereof are as follows.

Tensile strength Breaking elongation Fiber kg / mm ² (%) Polyester fiber About 115 About 13 Polyamide (Nylon) fiber About 100 About 19

The surface of the fiber cloth reinforcing layer has a required smoothness or anti-slip property depending on the intended use of the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet, or
It may have a desired color, pattern, etc. The fiber fabric reinforcing layer may be subjected to a treatment for imparting the above-mentioned characteristics, or may be coated.

In the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention, the amorphous metal thin film layer is covered with at least one flexible polymer foam porous material layer. The combined foamed porous material layer is easily deformable and easily compressed. Therefore, for example, when this reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet is bent and deformed, the flexible polymer foam porous material layer is easily deformed to prevent the expansion and breakage of the amorphous metal thin film, And it can be easily compressed and deformed to fit the shape of the device to be coated or packaged.

The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention will be further described below with reference to examples. Example 1 Amorphous alloy thin film (Fe: 81%, B: 13.5)
%, Si: 3.5%, C: 2%, trademark: METGLAS
No. 2605SC, manufactured by Allied Company, ribbon-shaped body having a width of 7.62 cm and a thickness of 25 μm) was used. Thirteen sheets of this amorphous alloy thin film ribbon were arranged in parallel with each other, and each side edge was overlapped by 1 cm to form a sheet.

A synthetic rubber adhesive (trademark: SC 12N, manufactured by Sony Chemical Co., Ltd.) was applied to both sides of this wide amorphous alloy sheet, and the glass fiber cold gauze KS-5207 described in Example 2 was stuck thereon. Then, a polyurethane foam having a foaming ratio of 40 times, a porosity of 97.5%, and a thickness of 5 mm was adhered on it by the above adhesive.

The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet thus obtained showed an electromagnetic wave shielding property of 50 dB. In addition, this reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet has a very small elongation deformation of the glass fiber gauze, so there is no sliding or slipping of the unbonded metal thin film ribbon, and there is almost no swelling at the joint part. It wasn't noticeable. This reinforced amorphous metal thin film laminated sheet having electromagnetic wave shielding exhibited good tensile strength and tear strength, and was easy to handle.

Example 2 The same operation as in Example 1 was performed. However, 11 same amorphous alloy thin films as those described in Example 1 were arranged in parallel, and the adjacent side edges were joined by solder to form a wide sheet. In addition, polyurethane foam is pre-fabricated with gauze type glass fiber cloth (trademark: KS-520).
7, Kanebo Glass Fiber Co., Ltd., thickness 0.1mm, weight 38g
/ M ² , leno weave, warp (7 + 7) /25.4mm, weft 7
Book / 25.4 mm, fiber tensile strength 350 kg / mm ² , fiber breaking elongation 3%, fabric tensile strength, each in both directions of warp and weft 18,
A composite sheet obtained by adhering 20 kg / 2.5 cm, the breaking elongation of the fabric, and 3.0% in both the longitudinal and latitudinal directions was adhered to the amorphous metal thin film.

The obtained reinforced amorphous metal thin film laminated sheet having electromagnetic wave shielding property had good electromagnetic wave shielding property, and excellent tensile strength and tear strength together with deformation flexibility, and was useful as a heavy packaging material. .

Example 3 The same operation as in Example 2 was performed. However, instead of glass gauze, polyester filament plain weave sackcloth with the following structure: 500 denier × 500 denier ─────────────────── 7 pcs / 25.4 mm × 7 pcs / 25.4 mm was used. This plain woven fabric has a thickness: 0.3 mm and a basis weight: 4
0 g / m ² , fabric tensile strength: both warp and weft 25 kg / 3
cm, cloth breaking elongation: 15% in both the longitudinal and longitudinal directions, fiber tensile strength: 110 kg / mm ² , and fiber breaking elongation: 13%.

The obtained reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet has good electromagnetic wave shielding property and deformation flexibility as well as high tensile strength and tear strength, and is handled as a heavy covering sheet or a heavy packaging sheet. It was easy. On the fiber cloth reinforcing layer of the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet, a leather-like skin is pasted, and a nylon tricot half is pasted on the back side of the amorphous metal thin film, which has a leather-like appearance. An electromagnetic wave shielding cabinet coating sheet was obtained.

[0043]

The reinforced amorphous metal thin film laminated sheet of the present invention exhibits good electromagnetic wave shielding properties due to the amorphous metal thin film layer, and includes a flexible polymer foam porous material layer and a fiber cloth reinforcing layer. By laminating the coating layer to the amorphous metal thin film layer, good flexibility, compressive elasticity, tenacity and accompanying cushioning properties were obtained. In the reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet of the present invention, the flexible polymer foam porous material layer is compressed and collapses during bending, and the amorphous metal thin film layer is bent with a large curvature. Due to the buffering action of the flexible polymer foamed porous material layer, the amorphous metal thin film is partially stretched abnormally and is torn or broken, or is bent sharply due to the buffering action of the elastic body, and creases are generated. It is useful as a heavy-covered sheet or a heavy-wrapping sheet without any damage.

Claims (16)

[Claims] 1. An amorphous metal thin film layer comprising: an electromagnetic wave shielding amorphous metal thin film layer; and a coating layer which is bound on at least one surface of the amorphous metal thin film layer and is made of a flexible material. Is formed by arranging a plurality of amorphous metal thin film ribbons in parallel with each other, and at least one layer of the coating layer is
Reinforced electromagnetic shielding amorphous, comprising a flexible polymer foam porous material layer having a thickness of 0.5 to 100 mm, the coating layer further having a fiber fabric reinforcing layer. Metal thin film laminated sheet. 2. A coating layer made of a flexible material is bound to both surfaces of the amorphous metal thin film layer, and the flexible material forming at least one layer of the coating layer is a flexible polymer foam porous material. The reinforced electromagnetic shielding amorphous metal thin film laminate sheet according to claim 1, which comprises a layer. 3. A coating layer bonded to one surface of the amorphous metal thin film layer includes a flexible polymer foam porous material layer, and is bonded to another surface of the amorphous metal thin film layer. The reinforced electromagnetic shielding amorphous metal thin film laminate sheet of claim 2, wherein the applied coating layer comprises a flexible polymeric non-porous material layer. 4. The covering layer including the flexible polymer foam porous material layer, wherein the fiber fabric reinforcing layer is bound to the flexible polymer foam porous material layer. 6. A reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet according to [4]. 5. A coating layer including the flexible polymer non-porous material layer, wherein the flexible polymer non-porous material layer comprises:
The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet according to claim 3, wherein the fiber cloth reinforcing layer is bound. 6. The reinforced electromagnetic wave shield according to claim 1, wherein the plurality of amorphous metal thin film ribbons arranged in parallel are joined to each other at their side edges that are adjacent to each other and facing each other. Amorphous metal thin film laminated sheet. 7. The reinforced electromagnetic wave shielding amorphous metal thin film laminate sheet according to claim 6, wherein the amorphous metal thin film ribbon is joined by soldering. 8. The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet according to claim 6, wherein the amorphous metal thin film ribbon is bonded by an adhesive. 9. The reinforced electromagnetic wave shielding amorphous metal thin film laminate sheet according to claim 8, wherein the adhesive is a conductive adhesive. 10. The amorphous metal thin film has a thickness of 100 μm.
The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet according to claim 1, which has a thickness of m or less. 11. The amorphous metal thin film has a thickness of 70 μm.
The reinforced electromagnetic wave shielding amorphous metal thin film laminate sheet according to claim 10, which has the following thickness. 12. The amorphous metal thin film contains Fe as a main component, on which B, Si, C, Co, Ni and Mo are added.
The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet according to claim 1, which is composed of an amorphous metal thin film to which at least one selected from the above is added. 13. The reinforced electromagnetic wave shielding amorphous metal thin film laminate sheet according to claim 1, wherein the flexible polymer foam porous material layer has a porosity of 50 to 99%. 14. The reinforced electromagnetic wave shielding amorphous metal thin film laminated sheet according to claim 1, 4 or 5, wherein the fiber fabric reinforcing layer has a higher tensile strength than the amorphous metal thin film layer. 15. The reinforced electromagnetic wave shielding amorphous metal thin film laminate sheet according to claim 1, 4, or 5, wherein the fiber fabric reinforcing layer has a breaking elongation of 5% or less. 16. The fiber fabric reinforcing layer comprises 130 kg / mm.
The reinforced electromagnetic wave shielding amorphous metal thin film laminate sheet according to claim 1, 4 or 5, comprising a fiber having a tensile strength of ² or more and a breaking elongation of 5% or less.