JP3034240B2 - Electromagnetic wave / magnetic shield material and electromagnetic wave / magnetic shield method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is, electromagnetic waves, magnetic Sea
Related to shield materials and electromagnetic wave / magnetic shield methods .

[0002]

2. Description of the Related Art Recently, with the rapid expansion of the use of electric and electronic devices, the amount of electromagnetic waves and magnetism radiated around these devices has increased. It becomes sensitive to electromagnetic waves and magnetism, and malfunctions such as malfunctions occur. Therefore, it is necessary to enclose electric and electronic devices with shielding materials to shield them from external electromagnetic waves and magnetism, to prevent radiation of electromagnetic waves and magnetism to the outside, and in some cases, to cover entire rooms or buildings. Needs to be covered with a shielding material.

[0003] As such a shielding material, a composite material in which an amorphous alloy foil which is a magnetic material and has an outstandingly high magnetic permeability as compared with other materials and a conductive metal foil such as copper, aluminum or the like is combined. Materials are being used. However, at present, the maximum width of amorphous alloy foil is 170 mm, and it is expected that 213 mm will be supplied in the near future. However, with such a narrow width, shielding over a large area such as the outer wall of a building is expected. At the time of attaching the material, not only is workability inferior, but also a gap may be generated, and it is difficult to improve the shielding effect of electromagnetic waves and magnetism.

Therefore, as a method of manufacturing a wide shield material made of an amorphous alloy foil, for example, a method of joining a copper or aluminum foil to at least one surface of the amorphous alloy foil with an adhesive and soldering the same to increase the width ( JP-A-63-4699), a method of applying a metal plating of copper, nickel, zinc, or the like to the surface of an amorphous alloy foil and soldering the ends thereof to widen the width (JP-A-61-265900) has been proposed. ing.

It is generally said that the shielding effect of the shielding material against electromagnetic waves and magnetism increases as the thickness of the metal plate constituting the shielding material increases. The amorphous alloy foil is as thin as 20 to 30 μm, and in order to use it as a shielding material, one sheet does not have a sufficient shielding effect, and several sheets need to be stacked. Further, since one sheet is inferior in rigidity, by stacking a plurality of sheets, the rigidity is increased and it becomes possible to use it as a panel material. Then, what laminated | stacked the amorphous alloy foil and thermoplastic resin by heat (Japanese Patent Publication No. 61-37113) is proposed.

[0006]

However, there have been conventional electromagnetic and magnetic shielding materials using amorphous alloy foils, which have been made to be wide, but they are wide and several sheets are laminated to form one panel material. There is nothing that can be used as.

[0007]

In order to solve the above-mentioned problems, the present invention uses a coated amorphous alloy foil obtained by coating the surface of an amorphous alloy foil with a thermoplastic resin, and comprises a plurality of coated amorphous alloy foils. Are covered with a thermoplastic resin on at least one surface of a magnetic shield material formed by abutting the ends of each other and joining them so that the adjacent ends partially overlap.
Electromagnetic wave / magnetic seal with covered conductive metal layer
To provide wood materials .

[0008] The present invention also relates to a table of amorphous alloy foil.
Amorphous alloy coated on the surface with thermoplastic resin
Using foil, a plurality of the coated amorphous alloy foils
Butts so that the ends of adjacent parts partially overlap
A multi-layer structure consisting of multiple magnetic shield materials
At least one side of the magnetic shielding material is made of thermoplastic resin.
Electromagnetic / magnetic shield with coated conductive metal layer
Materials .

[0009] The plurality of magnetic shielding members are vertically weighted.
The multiple magnetic shields that make up each
Make sure that the joints of the coated amorphous alloy foil do not overlap.
It is preferable that they are layered. The amorpha
The thermoplastic resin that coats the surface of the alloy foil changes to male
It is preferable that the resin is a modified polypropylene resin.

The present invention also relates to the electromagnetic wave / magnetic seal.
The required number of steel sheets are piled up at the
It provides a characteristic electromagnetic wave and magnetic shield method.
is there.

Hereinafter, the present invention will be described in detail.

The amorphous alloy foil used for the magnetic shielding material or the electromagnetic wave / magnetic shielding material of the present invention is not particularly limited as long as it can shield magnetism and electromagnetic waves. For example, an amorphous alloy foil containing iron as a main component, an amorphous alloy foil containing cobalt as a main component, and the like can be given.

As specific examples of the amorphous alloy containing iron as a main component, an Fe.B.Si based amorphous alloy, Fe
・ B ・ Si ・ C amorphous alloy, Fe ・ B ・ Si
-Co-based amorphous alloys, Fe-Ni-Mo-B-based amorphous alloys, and the like.

Specific examples of the amorphous alloy containing cobalt as a main component include a Co.Fe.Ni.B.Si based amorphous alloy and a Co.Fe.Ni.Mo.B.Si based amorphous alloy. Further, these amorphous alloy foils may be subjected to an annealing treatment in advance in order to improve the magnetic shielding characteristics.

The plurality of magnetic shield layers in the magnetic shield material of the present invention may be composed of only one of these amorphous alloy foils, or each magnetic shield layer may be composed of a different kind of amorphous alloy foil. May be.

The thermoplastic resin used for the magnetic shielding material or the electromagnetic wave / magnetic shielding material of the present invention is a thermoplastic resin which forms a thin film on the surface of an amorphous alloy foil, is heat-sealed to each other, and has thermal adhesion to metal. There is no particular limitation as long as it exists. For example, polypropylene resin, polyethylene resin,
Nylon resin, polyester resin, polymethylpentene resin, ionomer resin, ethylene-vinyl acetate copolymer resin, vinyl chloride resin, polycarbonate resin, acrylic resin, vinylidene chloride resin, polypropylene-modified resin, etc. A polypropylene-modified resin is preferred in that it has good thin film forming properties on the foil surface, good thin film peel strength, and the like. Among them, a maleic modified polypropylene modified resin is preferable,
The maleation ratio is usually 0.05 to 10% by weight, preferably 0.1 to 1% by weight.

Also, amorphous alloy foils tend to gradually crystallize at high temperatures and lose their desirable properties, and may become brittle even at temperatures significantly below the crystallization temperature.
In this regard, a polypropylene-modified resin having a film formation temperature and a melting point of 250 ° C. or less is preferable.

This thermoplastic resin is usually about 1 to 10 μm, and more preferably 3 to 5 μm, in that the workability when coating the surface of the amorphous alloy foil and the fusion strength between the resins are improved.
It is preferably about μm.

Further, by covering the amorphous alloy foil with a thermoplastic resin, it is possible to play a role of preventing corrosion, particularly when an Fe-based amorphous alloy foil is used.

The magnetic shielding material of the present invention uses a coated amorphous alloy foil obtained by coating the surface of the above-mentioned amorphous alloy foil with the above-described thermoplastic resin. Are joined so that adjacent ends partially overlap.

The above-mentioned coated amorphous alloy foil can be produced by, for example, applying a thermoplastic resin solution dissolved in a suitable solvent to the surface of the amorphous alloy foil and drying it, or a method of fusing the thermoplastic resin. It may be performed by a method.

In the production of the magnetic shielding material of the present invention, for example, the coated amorphous alloy foil is used, and a plurality of the coated amorphous alloy foils are butt-butted to each other so that adjacent ends partially overlap. A method for producing a magnetic shield material, comprising a step of joining a plurality of coated amorphous alloy foils by arranging and heating the thermoplastic resin at a temperature not lower than the melting point of the thermoplastic resin and not higher than the crystallization temperature of the amorphous alloy foil to melt the thermoplastic resin. Can be done by

This method will be described below based on the embodiment shown in FIGS. First, as shown in FIG. 1, the surface of an amorphous alloy foil 1 is coated with a thermoplastic resin layer 2 to produce a coated amorphous alloy foil 3.

As a method for coating the amorphous alloy foil 1 with the thermoplastic resin 2, for example, a solution or dispersion obtained by dissolving or dispersing the thermoplastic resin in a suitable solvent may be used.
A method of applying to an amorphous alloy foil according to a conventional method, drying and heating the resin to a temperature equal to or higher than the melting point of the thermoplastic resin, followed by baking. Specifically, the aforementioned polypropylene-modified resin may be used as a thermoplastic resin, applied as a toluene emulsion, dried, and then baked.

The baking temperature is preferably not lower than the melting point of the thermoplastic resin and not higher than the crystallization temperature of the amorphous alloy foil.

The thermoplastic resin may cover both surfaces of the amorphous alloy foil, or may cover only one surface.

Next, as shown in FIG. 2, a plurality of coated amorphous alloy foils 31, 32, 33 and 34 are trimmed to a predetermined length, and the ends 41a and 42b, 42a and 4
3b, 43a and 44b are respectively superposed to form superimposed portions 512, 523 and 534, and the required number of them are arranged so as to have a predetermined width.
523 and 534 are heated to melt the thermoplastic resin and join the respective coated amorphous alloy foils to produce a wide magnetic shield material 6. At this time, if necessary, a coated amorphous alloy foil having a different width may be used so that the width of the obtained wide magnetic shield material becomes a desired width. For example, a coated amorphous alloy foil cut to a required width by cutting in the length direction may be used.

The heating of the overlapping portion may be performed by heating over a plurality of portions of the overlapping portion, or may be performed by heating the entire surface. The method of heating is
Any method may be used, such as a method in which a heating source such as a soldering iron or a heat sealer is brought into contact, or a method in which heated air is blown such as a hot air gun and heated.

The heating temperature is preferably not lower than the melting point of the thermoplastic resin and not higher than the crystallization temperature of the amorphous alloy foil. The number and location of heating may be appropriately selected according to the size of the wide magnetic shield material so as not to collapse when held by hand.

The overlap between the ends of the adjacent coated amorphous alloy foils is usually preferably about 3 to 20 mm, more preferably about 5 to 15 mm.

A multilayer magnetic shield material is obtained by laminating a plurality of such magnetic shield materials so as to obtain required magnetic shield performance and rigidity.

The multi-layer magnetic shield material is manufactured by, for example, stacking a plurality of the above magnetic shield materials and heating the magnetic shield material at a temperature not lower than the melting point of the thermoplastic resin and not higher than the crystallization temperature of the amorphous alloy foil. It can be performed by a method including a step of bonding a shield material. The heating temperature and the like for laminating and bonding the magnetic shield material are the same as in the case of manufacturing the magnetic shield material.

Next, a method for manufacturing this multilayer magnetic shielding material will be described based on the embodiment shown in FIGS. First, as described above, the magnetic shielding material 6 having a predetermined size is used.
Are prepared in plurals. At this time, in the subsequent step, when the wide magnetic shield materials are overlapped, the wide magnetic shield materials are manufactured so that the overlapping portions of the coated amorphous alloy foils in the upper and lower magnetic shield materials do not overlap. Then, the positions of the overlapping portions may be adjusted so as to be shifted.

Next, the plurality of wide sheets 61, 62, 63 and 64 obtained in this way are overlapped and bonded.
As a method of overlapping, the magnetic shield materials may be stacked so that the overlapping portions are in the same direction, or may be stacked so that the upper and lower magnetic shield materials are in directions orthogonal to each other.

The number of laminations of the wide magnetic shield material depends on the strength and frequency of the magnetic source to be shielded, but is usually about 2 to 30, more preferably 7 to 20.

The laminated product of a plurality of wide magnetic shield materials obtained as described above is heated from one or both sides to melt the thermoplastic resin, and the plurality of wide magnetic shield materials are bonded. Thus, the multilayer magnetic shielding material 7 can be obtained. The heating method and temperature are the same as in the case of manufacturing the wide magnetic shield material. At this time, it is preferable to remove the heating unit and press the top with a metal rod or the like at the same time as the adhesiveness of each unit is further improved.

Further, the present invention also provides an electromagnetic wave / magnetic shield material having a conductive metal layer on at least one surface of the above-mentioned magnetic shield material or multilayer magnetic shield material.

The conductive metal layer of the electromagnetic wave / magnetic shield material may be made of any metal as long as it has conductivity, and is not particularly limited. For example,
Examples include foils of copper, aluminum, nickel, zinc, iron and the like. Among these, copper foil is preferred because it is inexpensive and easily available.

The conductive metal layer may be formed only on one surface of the magnetic shield material or the multilayer magnetic shield material, or may be formed on both surfaces.

The thickness of the conductive metal layer depends on the electromagnetic wave to be obtained.
15-50μ because the magnetic shielding material has sufficient rigidity
m is preferred.

This electromagnetic wave / magnetic shielding material is obtained by laminating a conductive metal foil on at least one surface of a thermoplastic resin layer of the magnetic shielding material obtained as described above, and having an amorphous alloy having a melting point equal to or higher than the melting point of the thermoplastic resin. It can be manufactured by heating and bonding at a temperature lower than the crystallization temperature of the foil. For example, taking as an example the manufacture of an electromagnetic wave / magnetic shield material having a conductive metal layer on both surfaces of a multilayer magnetic shield material, as shown in FIG. Then, the electromagnetic wave / magnetic shielding material 9 shown in FIG.

The magnetic shield material or the multilayer magnetic shield material is bonded to the conductive metal foil by applying a heat source heated to a temperature higher than the melting point of the thermoplastic resin to a portion to be joined from one side of the magnetic shield material or the multilayer magnetic shield material. Are melted and adhered. At this time, it is preferable to align the ends in advance.

The method of heat fusion is the same as the method of joining the overlapping portions in the production of the magnetic shield material or the multilayer magnetic shield material, that is, by pressing a heating source such as a soldering iron, a heat sealer or the like. Any method of melting the thermoplastic resin or a method of blowing heated air like a hot air gun to melt the thermoplastic resin may be used, but when heating, heat passes from the top to the bottom. The thermoplastic resin may be melted. Among these, a method is preferred in which a large soldering iron with a flattened tip is applied and bonded.

It is not necessary to bond the entire surface of the magnetic shielding material or the multilayered magnetic shielding material to the conductive metal foil, and partial adhesion is preferable. At least four points of four corners are necessary for heat bonding, but from the viewpoint of the size of the laminated body and handleability,
It may be determined appropriately. In addition, it is preferable to remove the heating element and press down with a metal rod or the like at the time of adhesion, since the adhesion is further improved.

Further, according to the present invention, a required number of the magnetic shield materials are prepared at a construction site where a magnetic shield is to be applied,
The present invention provides a magnetic shield method characterized by stacking and welding this in accordance with a construction site to form a laminate. According to this method, a suitable magnetic shield can be configured in accordance with the form, situation, and the like of construction.

Further, the present invention provides the above magnetic shield material,
Alternatively, an electromagnetic wave / magnetic shielding method is provided in which a required number of any of the above-described multilayer magnetic shielding materials are stacked at a construction site, a conductive metal foil is laminated on one or both surfaces thereof, and this is welded. is there. According to this method, it is possible to configure a suitable electromagnetic wave / magnetic shield according to the type of construction, situation, and the like.

[0047]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments.

Example 1 170 mm in width and 25 μm in thickness
Fe-based amorphous alloy foil (trade name METGLAS2605S-2
Fe-B-Si-based: Alleed Co., Ltd. has a maleated modified polypropylene-modified resin (maleization rate of 0.1%) on the entire surface.
(55% by weight) was coated to a thickness of 5 μm, and then cut into a length of 910 mm to prepare a plurality of material sheets. Next, this material sheet was arranged in the width direction by overlapping each end with five sheets each having a width of 170 mm and one sheet each having a width of 60 mm. A flat soldering iron was pressed against and joined by heating to produce a wide magnetic shield material of 910 × 910 mm.

In a similar manner, ten wide-width magnetic shield materials having a width of 910 mm and different positions of overlapping portions were produced. Ten wide magnetic shield materials were superimposed to obtain a multilayer magnetic shield material having a structure in which the upper and lower magnetic shield materials did not overlap each other.

The magnetic shielding performance of the obtained multilayer magnetic shielding material was measured by the shield box method. 200 milligauss attenuated to 30 milligauss and 300 milligauss attenuated to 50 milligauss, and 0.5 gauss of geomagnetism attenuated to 0.09 gauss.

(Example 2) An electrolytic copper foil having a thickness of 910 x 910 mm and having a thickness of 35 µm was placed on the magnetic shielding material obtained in Example 1, and a soldering iron having a flattened end was pressed into several places. To obtain an electromagnetic wave / magnetic shield material. The electromagnetic wave shielding performance of the obtained electromagnetic wave / magnetic shielding material was measured by a shield box method.
Decayed to dB.

(Example 3, Reference Examples 1 to 3) The following tests were conducted on the thin film peeling property and corrosion prevention property. A toluene emulsion of a maleated modified polypropylene-modified resin (maleization rate: 0.55% by weight) is applied to the entire surface of the iron-based amorphous alloy foil, dried and fused in an oven at 200 ° C. to a thickness of 5 μm. Test samples were made by coating.

The thin film peeling test was performed by a cross-cut cellophane tape peeling method. Further, in the corrosion prevention test, the amorphous alloy foil was immersed in tap water for 48 hours, and the rusting property of the amorphous alloy foil was visually determined. The results are shown in Table 1.

As Reference Examples 1, 2 and 3, aqueous dispersions of a low-density polyethylene resin, an ionomer resin and an ethylene-vinyl acetate copolymer resin were applied to the entire surface of an iron-based amorphous alloy foil, dried, and dried at 150 ° C. A test sample was prepared by fusion-coating in an oven, and the same test as in Example 3 was performed. The results are shown in Table 1.

[0055]

Thin film peeling test A cut made by penetrating the coating film on the test piece and reaching the fabric surface of the test piece was cut almost vertically in the center of the test piece with a sharp blade specified in JIS G4401. 1 to 11 parallel lines
Cut at intervals of mm and make a grid-shaped cut so that 100 squares are formed in 1 cm ² . A cellophane tape is stuck to the cut test piece, rubbed vertically and horizontally 10 times with a pestle, and then the cellophane tape is peeled off. Peelability is determined by the number of peeled / 100.

[0057]

The magnetic shield material of the present invention has a magnetic shield layer made of an amorphous alloy foil having a high magnetic permeability, is wide and rigid, and has a magnetic seal panel material, a magnetic shield room, It can be suitably used in a wide range of applications such as a shield room, a medical room, various measurement rooms, a magnetic shield in a computer room, or a shield material used for electromagnetic wave / magnetic shield.

Further, the electromagnetic wave / magnetic shield material of the present invention comprises a magnetic shield layer made of a narrow amorphous alloy foil having a high magnetic permeability and a conductive metal layer made of a conductive metal foil having a high electric conductivity. With this, it is possible to obtain a wide and rigid laminated electromagnetic wave and magnetic shield material.

Therefore, the magnetic shielding material and the electromagnetic wave / magnetic shielding material of the present invention are wide and rigid, and can be handled as one panel when the shielding material is required over a wide area such as the outer wall of a building. And the workability is greatly improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating one embodiment of a method for manufacturing a magnetic shield material of the present invention.

FIG. 2 is a diagram illustrating one embodiment of a method for manufacturing a magnetic shield material of the present invention.

FIG. 3 is a diagram illustrating one embodiment of a method for manufacturing a multilayer magnetic shield material of the present invention.

FIG. 4 is a diagram illustrating one embodiment of a method for manufacturing a multilayer magnetic shield material of the present invention.

FIG. 5 is a diagram illustrating an embodiment of the method for producing an electromagnetic wave / magnetic shield material of the present invention.

FIG. 6 is a diagram illustrating an embodiment of the method for manufacturing an electromagnetic wave / magnetic shield material of the present invention.

[Explanation of symbols]

Reference Signs List 1 amorphous alloy foil 2 thermoplastic resin 3, 31, 31, 33, 34 coated amorphous alloy foil 41a, 41b, 42a, 42b, 43a, 43b, 4
4b End 512, 523, 534 Overlapping portion 6, 61, 62, 63, 64 Magnetic shield 7 Multilayer magnetic shield 81, 82 Conductive metal foil 9 Electromagnetic wave / magnetic shield

Continuation of the front page (56) References JP-A-64-1530 (JP, A) JP-A-64-76800 (JP, A) JP-A-3-132341 (JP, A) JP-A-3-159195 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05K 9/00

Claims (6)

(57) [Claims] 1. A coated amorphous alloy foil in which the surface of an amorphous alloy foil is coated with a thermoplastic resin is used. At least one side of the magnetic shield material joined so that it overlaps is covered with thermoplastic resin
Electromagnetic wave / magnetic shield having a conductive metal layer coated
Wood. 2. The surface of an amorphous alloy foil is made of a thermoplastic resin.
Using a coated amorphous alloy foil coated with
Butt the edges of multiple amorphous alloy foils
Magnets that are joined so that adjacent ends partially overlap
Multilayer magnetic shielding material consisting of multiple layers of air shielding material
Conductive coated on at least one side with thermoplastic resin
Electromagnetic / magnetic shielding material with a metal layer. 3. The magnetic shielding material according to claim 2, wherein a plurality of magnetic shielding materials are laminated so that joining portions of a plurality of coated amorphous alloy foils constituting each of the vertically overlapping magnetic shielding materials do not overlap. Electromagnetic wave / magnetic shield material. 4. The electromagnetic wave / magnetic shielding material according to claim 1, wherein the thermoplastic resin covering the surface of the amorphous alloy foil is a maleated and modified polypropylene resin. 5. An electromagnetic wave / magnetic shield method comprising the steps of: laminating a required number of the electromagnetic wave / magnetic shield materials according to claim 1 at an execution site and welding them. 6. An electromagnetic wave / magnetic shield method comprising the steps of: stacking a required number of the electromagnetic wave / magnetic shield materials according to claim 2 or 3 at a construction site and welding them to form a laminate.