JP2005183883A - Sheet for electromagnetic wave shield, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet for electromagnetic wave shield which can be utilized in recycling simply and easily when utilizing it again as resources, further, prevent the deterioration of shield performance caused by a crack in such a way of improving the following performance of displacement as a purpose of improving shield performance necessary to an interference countermeasure against a wireless LAN (2.4GHz, 5GHz) or PHS (1.9GHz)for a business purpose to be 20dB or more, and its manufacturing method. <P>SOLUTION: The sheet for electromagnetic wave shield which is finished in such a manner that electromagnetic wave shield drainage texture paint, prepared by making chain-like nickel powder/and scale-like nickel powder, or scale-like silver powder/and scale-like silver coat copper powder compounded into resin emulsion, is coated on a substrate or a substrate with an adhesion layer, and dried, and its manufacturing method. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to an electromagnetic wave shielding sheet used for inner and outer walls of buildings, housings of electronic devices, and the like, and more specifically, chain nickel powder or / and scaly nickel powder, scaly silver powder or / and scaly silver coat An electromagnetic wave shielding water-based paint prepared by blending a copper powder with a resin emulsion is finished on a base material or a base material with an adhesive layer, and preferably an electromagnetic wave shielding sheet having a protective layer on the surface. It relates to the manufacturing method.

Electromagnetic waves are generated in large quantities from home appliances, personal computers, heating, lighting, communication electronic devices, electric devices employed in various power sources, various electric power facilities, various control systems, and the like. Such electromagnetic waves are generated everywhere and enter the building or fly in the building to cause problems such as malfunction of electronic devices and further leakage of confidential information.
There are also concerns about the adverse health effects of electromagnetic waves on the human body, such as upset the body and causing leukemia.

As countermeasures against such problems and anxieties, electromagnetic shielding materials have been proposed that employ means such as conductive paints, conductive sheets, conductive nonwoven fabrics, and metal plating.
However, in the case of a conductive paint, since a resin binder in which a resin is dissolved in an organic solvent is used, the organic solvent volatilizes when applied to a large area, contaminates the surroundings, and is sucked by an operator. For this reason, there were problems such as undesirable for health and undesirable for fire prevention management measures.
In addition, if the conductive coating material changes dimensions due to some reason, the coating film cracks and the shielding performance deteriorates, and the shielding necessary for interference countermeasures in wireless LANs and office PHSs. Those with a performance of 20 dB or more have not been developed.

Also, when a conductive material such as metal powder is combined with a water-based binder, problems remain such as the conductive material tends to settle and requires skill in production, and the metal powder rusts and deteriorates electromagnetic shielding performance. It was.
In order to reduce the specific gravity against the problem that the conductive material settles in the binder solution, a method of preparing a conductive material by providing a coating layer on the surface of the resin hollow body and a conductive paint using the same Although a method of coating has been studied, there are problems such as low productivity and high cost due to difficulty in processing in an isolated state and complicated processing steps, and it has not been adopted.
In addition, although there are methods such as resin coating of metal powder for rust prevention of metal powder, it is expensive and impractical, and the expected electromagnetic shielding performance is obtained because the resin layer is interposed between metal powders. There was a problem such as not being able to.
JP-A-9-35530

The present invention has the above-mentioned problems, that is, environmental problems, health problems and fire prevention management problems related to the organic solvent contained in the resin binder, sedimentation of conductive materials, metal powder rusts, and electromagnetic shielding performance. Solved the problem of deterioration, combined with the sheet form, cut into a predetermined size and used for various electronic devices, etc., and used when the electronic devices are updated to a new model When the material that has been peeled off from the part and used in the housing is reused as a resource, it can be easily and easily recycled.
In addition, aiming at shield performance of 20 dB or more necessary for interference countermeasures for wireless LAN (2.4 GHz, 5 GHz) and office PHS (1.9 GHz), it is intended to prevent shield performance deterioration due to cracks by improving displacement tracking. This has been done and will be described in detail below.

In order to solve the above problems, in the present invention, as the conductive material, chain nickel powder or / and flaky nickel powder, flaky silver powder or / and flaky silver-coated copper powder, and aqueous resin The electromagnetic wave shielding water-based paint prepared by combining the emulsion is an electromagnetic wave shielding sheet prepared on a substrate or a substrate with an adhesive layer, preferably the electromagnetic wave shielding sheet further provided with a protective layer on the surface. It solves such a problem.

The electromagnetic wave shielding sheet according to the present invention is an electromagnetic wave shielding water-based paint applied on a base material or a base material with an adhesive layer and finished, so that a post process is performed on a necessary part of a housing such as an electronic device. Can be easily cut and pasted.
Moreover, since it has a high electromagnetic shielding performance of 20 dB or more and at the same time has excellent film properties and durability, it can be easily used for wide electromagnetic shielding applications.
Furthermore, since it is more flexible than conventional conductive non-woven fabrics and metal foils, it can follow the displacement of the substrate and exhibit stable shielding performance at places where cracks are likely to occur.
The electromagnetic shielding sheet having a protective layer on its surface can be used for a long period of time as a durable electromagnetic shielding material because it can prevent scratches and abrasion in addition to the above-described characteristics.
In the case where a substrate with an adhesive layer is used, the electromagnetic shielding sheet can be easily peeled off from the mounting location of the housing, etc., so the material used in the housing etc. can be easily recycled using resources. it can.
Moreover, in the manufacturing method of the electromagnetic wave shielding sheet according to the present invention, since processing is performed using an electromagnetic wave shielding water-based paint without precipitation of metal powder, there is no process trouble, and disaster prevention measures are simplified in the production process. In addition, the organic solvent is not released into the atmosphere and does not cause environmental pollution.

Hereinafter, the present invention will be described in detail.
The chain nickel powder according to the present invention is suitable in which the primary particles are spherical and the aggregate of the primary particles has a three-dimensional chain structure, and the average primary particle size is 0.1 to 5 μm. . If the thickness is 0.1 μm or less, the viscosity of the electromagnetic wave shielding water-based paint becomes undesirably too high, and if it is 5 μm or more, the dispersibility is poor.

The scale-like nickel powder is obtained by processing the nickel powder into a scale-like shape by means such as a vibration mill or a planetary ball mill, and those having an average particle diameter of 0.1 to 20 μm are suitable for use. Those having a thickness of 0.1 μm or less are not suitable because the viscosity of the electromagnetic wave shielding water-based paint becomes too high, and those having a thickness of 20 μm or more are not preferable because of poor dispersibility.
In addition, when evaluating about 5-30 micrometers spherical type as nickel powder, there exists a problem in miscibility with a resin emulsion, and since it settles, it turned out that it is not suitable for use.

As the silver powder, those having an average particle diameter of 0.1 to 80 μm obtained by processing a silver powder produced by a chemical reduction method into a scale shape by means such as a vibration mill, a planetary ball mill, or a crushing method are suitable for use. Those having a thickness of 0.1 μm or less are not suitable because the viscosity of the electromagnetic shielding water-based paint becomes too high, and those having a thickness of 80 μm or more are not preferable because of poor dispersibility.

The scaly silver-coated copper powder is suitable for use when the copper powder processed into a scaly shape by a pulverization method and finished by silver coating treatment by a plating method has an average particle size of 0.1 to 80 μm. Those having a thickness of 0.1 μm or less are not suitable because the viscosity of the electromagnetic shielding water-based paint becomes too high, and those having a thickness of 80 μm or more are not preferable because of poor dispersibility.

A known resin emulsion can be used as the resin emulsion according to the present invention. Specific examples include acrylic resin emulsion, urethane resin emulsion, vinyl acetate resin emulsion, styrene / vinyl acetate copolymer resin emulsion, vinyl acetate / acrylic copolymer resin emulsion, ethylene vinyl acetate copolymer resin emulsion, vinyl acetate / veova. Examples thereof include polymer resin emulsions.

Among these, when the resin emulsion is obtained by emulsion polymerization using a monomer having a lipophilic group and a monomer having a hydrophilic group, the metal powder blended in the resin emulsion, particularly in the form employed in the present invention. In this metal powder, the tendency to suppress sedimentation is observed.
The reason for this is not necessarily clear, but since the lipophilic group is arranged inside the resin emulsion and the hydrophilic group is arranged outside the resin emulsion, the polar metal powder is coordinated to the hydrophilic group. In particular, it is presumed that the metal powder in the form used in the present invention has a significantly increased shear stress, so that sedimentation is suppressed.
From such a situation, it is preferable to employ a resin emulsion obtained by emulsion polymerization using a monomer containing a monomer having a lipophilic group and a monomer having a hydrophilic group.

  Monomers with lipophilic groups include cyclohexyl (meth) acrylate, methylcyclohexyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate , (Meth) acrylic acid butyl, (meth) acrylic acid propyl, (meth) acrylic acid 2-ethylhexyl, (meth) acrylic acid lauryl, (meth) acrylic acid benzyl, (meth) acrylic acid cyclohexyl, etc. One or two or more monomers such as (meth) acrylic acid ester having about 12 alkyl groups, (meth) acrylonitrile, styrene, α-styrene, vinyltoluene, and vinyl acetate are used.

The hydrophilic group includes a carboxyl group, an alkoxysilyl group, an amino group, a hydroxyl group and the like, and one or more monomers having these can be selected and used.

Examples of the monomer containing a carboxyl group include acrylic acid, methacrylic acid, maleic acid, itaconic acid, and 2-acryloylethyl succinic acid.

Monomers containing alkoxysilyl groups include γ-trimethoxysilylpropyl (meth) acrylate, γ-methyldimethoxysilylpropyl (meth) acrylate, γ-triethoxysilylpropyl (meth) acrylate, vinylmethoxysilane, vinyltrimethoxy Silane etc. are mentioned. The alkoxysilyl group is hydrolyzable, and hydrophilicity can be obtained even when the hydroxyl group appears.

Monomers containing amino groups include dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, t-butylaminoethyl (meth) acrylate, monomethylaminoethyl (meth) acrylate, and (meth) acrylic amide , Itaconic acid amide, dimethylamino (meth) propylacrylamide, dimethylaminoethyl (meth) acrylamide, N-methoxymethylacrylamide, N-ethoxymethyl (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl ( And (meth) acrylamide.

Monomers containing hydroxyl groups include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, and propylene glycol mono. (Meth) acrylate, cyclohexanesimethanol mono (meth) acrylate, (meth) acrylic acid 2-ethylhexyl, and the like.

These resin emulsions are synthesized by adding a known colloid or surfactant in an amount of about 0.5 to 20% by weight based on the total amount of selected monomers and the total amount of water approximately equal to this amount. It can be synthesized by a method according to copolymerization.
The preferable property value of the resin emulsion is not particularly limited as long as it has a resin solid content of 40 to 60% by weight and a viscosity of 0.2 to 1 Pa · s / 25 ° C. and does not deviate from this property value.

The blending ratio of the chain nickel powder and / or the flaky nickel powder, or the flaky silver powder or / and the flaky silver coated copper powder with respect to the resin emulsion is 100 to 380 with respect to 100 parts by weight of the resin solid content of the resin emulsion. The weight part or more is suitable.
If the amount is 100 parts by weight or less, the electromagnetic wave shielding property cannot be obtained, so that the object of the present invention cannot be achieved. If it is 380 parts by weight or more, the fluidity of the coating material is lowered, and there are problems in coating properties and finishing properties.

In order to finish as an electromagnetic shielding water-based paint, compounding materials such as preservatives, ultraviolet absorbers, anti-aging agents, fillers, viscosity modifiers, and sag-preventing agents are also added as appropriate.
Fillers with various particle sizes from calcium carbonate, alumina, cinnabar sand, clay, kaolin, etc. are used for viscosity adjustment, cost adjustment, improvement of coating film drying by adjusting water content, and imparting design. .

The viscosity modifier is blended to adjust to a preferable viscosity as a paint, and one that does not adversely affect the resin emulsion is used.
As specific examples, hydroxyethyl cellulose, methyl cellulose, carboxy cellulose, gum arabic, guar gum, dextrin, galactan, pullulan, polyvinyl pyrrolidone, polyvinyl alcohol and the like can be blended in appropriate amounts.

Non-woven fabrics, woven fabrics, and cellulose fibers processed from synthetic fibers such as vinylon, polyester, nylon, and acrylic, natural fibers such as hemp and cotton, or glass fibers, etc. In addition to paper processed from hemp fibers, etc., synthetic resin film processed from synthetic resin such as polyester resin, polypropylene resin, polyethylene resin, vinyl chloride resin, or non-woven fabric, woven fabric, paper, etc. Examples thereof include a laminated base material with a synthetic resin film. In addition, a base material provided with an adhesive layer on the surface of a release paper, a release sheet or the like can also be used.
In addition, when the adhesion with these substrates is insufficient, a method in which adhesion is improved by applying a primer such as urethane resin, acrylic / urethane resin, epoxy resin, etc. to the substrate surface, A method such as a method of improving the adhesion by roughening the surface by a sander treatment, a method of improving the adhesion by performing an ozone treatment, or the like can be adopted.

The pressure-sensitive adhesive layer is provided on the back surface of the substrate or on the surface of the release layer such as release paper or release sheet. In the case where the adhesive layer is provided on the back surface of the base material, or on the surface of the release layer such as release paper or release sheet, the necessary part can be easily removed directly or by peeling the release layer through the adhesive layer. Can be attached to.
Pressure sensitive adhesive prepared based on adhesive resin components such as acrylic resins and urethane resins, or prepared by adding tackifying resin to acrylic resin, urethane resin and other resin components Pressure sensitive adhesives, or acrylic resins, urethane resins, acrylic / vinyl acetate copolymer resins, ethylene / vinyl acetate copolymer resins, styrene elastomers, etc. The heat-sensitive pressure-sensitive adhesive and the like, which are prepared in such a manner as to exhibit adhesiveness upon heating, are coated and finished.
For release layers such as release paper and release sheets, sheet-like substrates such as paper, cloth, and non-woven fabric are coated and impregnated with a resin having a low surface tension such as a silicone resin or tetrafluoroethylene resin. Applies.

In order to prepare an electromagnetic wave shielding sheet using these base materials, a method of directly applying an electromagnetic wave shielding water-based paint to a base material or a base material with an adhesive layer and drying it, a base having a release layer and an adhesive layer For the material, a method in which an electromagnetic wave shielding water-based paint is applied to the surface of the adhesive layer and dried to finish is employed.

In addition, a protective layer is appropriately provided to protect the surface of the electromagnetic wave shielding sheet from scratches, abrasion scratches, breakage, and the like.
As the protective layer, a coating type or a laminated type protective layer can be adopted, and the former is formed by applying various resin-based paints such as acrylic resin, acrylic / silicone resin, and urethane resin. In the latter, a resin film such as a polypropylene resin system, an acrylic resin system, an acrylic / urethane resin system, or a polyester resin system is laminated through an adhesive layer or an adhesive layer.
Further, a method of laminating and laminating the resin films as described above may be employed in a state where the electromagnetic wave shielding water-based paint is applied and is almost dry but still remains tacky.

  The present invention will be further described below with reference to examples and comparative examples. Weight parts are simply displayed as parts.

Example 1
To 100 parts of acrylic resin emulsion (Aika Avon RA-280 / Aika Industry Co., Ltd. NV = 50%), 100 parts of chain nickel powder (INCO company, product number NP, average particle size 2.5 μm) is blended. An electromagnetic wave shielding water-based paint was prepared by kneading. An example in which the electromagnetic wave shielding water-based paint is coated with 300 g / m ^{2 on} the surface of a polyester resin film (150 μm thick) having an adhesive layer made of an acrylic resin adhesive having a thickness of 0.2 mm on the back surface and dried to a thickness of 450 μm. 1 was prepared.

Example 2
100 parts of scaly nickel powder (manufactured by NOVAMET, part number HCA-1, average particle size 10 μm) is blended with 100 parts of acrylic resin emulsion (Aika Avon RA-280 / Aika Industry Co., Ltd. NV = 50%). An electromagnetic wave shielding water-based paint was prepared by kneading. Next, the electromagnetic shielding water-based paint is applied on the adhesive layer of the sheet having the same adhesive as that of Example 1 on the surface of the release paper (100 μm thick) coated with the silicon resin on the surface. 300 g / m ^{2 was} applied and dried to prepare an electromagnetic wave shielding sheet of Example 2 having a thickness of 300 μm.

Example 3
100 parts of acrylic resin emulsion (Aika Aibon RA-280 / Aika Industry Co., Ltd. NV = 50%), 50 parts of chain nickel powder (INCO company, product number NP, average particle size 2.5 μm), scaly 50 parts of a nickel powder (manufactured by NOVAMET, product number HCA-1, average particle size 10 μm) was blended and kneaded to prepare an electromagnetic shielding water-based paint. Next, 300 g / m ^{2 of the} electromagnetic shielding water-based paint was applied onto the adhesive layer of the same sheet as in Example 2 and dried. Further, 200 g / m ^{2 of} acrylic urethane resin was applied and dried from above to prepare an electromagnetic wave shielding sheet of Example 3 having a thickness of 400 μm.

Example 4
For 100 parts of acrylic resin emulsion (Aika Avon RA-280 / Aika Industry Co., Ltd. NV = 50%), scaly silver powder (manufactured by Fukuda Metal Foil Industry Co., Ltd., product number AgC-A, average particle size 3 to 10 μm) 100 The parts were mixed and kneaded to prepare an electromagnetic shielding water-based paint. Next, 50 g / m ^{2 of the} electromagnetic shielding water-based paint was applied to the adhesive layer of the same sheet as in Example 2 and dried. Furthermore, 200 g / m ^{2 of} acrylic urethane resin was applied and dried from above to prepare an electromagnetic wave shielding sheet of Example 4 having a thickness of 320 μm.

Example 5
For 100 parts of acrylic resin emulsion (Aika Avon RA-280 / Aika Industry Co., Ltd. NV = 50%), scaly silver-coated copper powder (Fukuda Metal Foil Powder Industries, product number 8% Ag-coated 2L3H, average particle size 31 μm) 100 parts were mixed and kneaded to prepare an electromagnetic shielding water-based paint. Next, 50 g / m ^{2 of the} electromagnetic shielding water-based paint was applied and dried on the adhesive layer of the same sheet as in Example 2. Furthermore, 200 g / m ^{2 of} acrylic urethane resin was applied and dried from above to prepare an electromagnetic wave shielding sheet of Example 5 having a thickness of 320 μm.

Example 6
For 100 parts of acrylic resin emulsion (Aika Avon RA-280 / Aika Industry Co., Ltd. NV = 50%), flaky silver powder (Fukuda Metal Foil Powder Industry Co., Ltd., product number AgC-A, average particle size 3 to 10 μm) 50 Part, scaly silver-coated copper powder (made by Fukuda Metal Foil Powder Industry, product number 8% Ag coat 2L3H, average particle size 31 μm) was mixed and kneaded to prepare an electromagnetic shielding water-based paint. Next, 50 g / m ^{2 of the} electromagnetic shielding water-based paint was applied and dried on the adhesive layer of the same sheet as in Example 2. Further, 200 g / m ^{2 of} acrylic urethane resin was applied and dried from above to prepare an electromagnetic wave shielding sheet of Example 6 having a thickness of 320 μm.

Comparative Example 1
100 parts of granular nickel powder (manufactured by NOVAMET Co., product number CNS, average particle size 10 μm) is blended and kneaded with 100 parts of acrylic resin emulsion (Aika Avon RA-280 / Aika Industry Co., Ltd. NV = 50%). An electromagnetic shielding water-based paint was prepared. The electromagnetic shielding sheet of Comparative Example 1 having a thickness of 450 μm was prepared by applying 300 g / m ^{2 on} the surface of a polyester resin film (150 μm thickness) having a 0.2 mm thick adhesive layer provided on the back surface of the electromagnetic shielding water-based paint. Created.

Comparative Example 2
100 parts of the chain nickel used in Example 1 is kneaded with 100 parts of an acrylic solvent-based resin (ROEHM GMBH & Co. KG, product number DEGALAN, NV = 40%) in which the acrylic resin is dissolved in an organic solvent. An electromagnetic shielding paint was prepared. The electromagnetic wave shielding paint was applied to the adhesive layer of the sheet used in Example 2 and dried at 300 g / m ² to prepare an electromagnetic shielding sheet of Comparative Example 2 having a thickness of 300 μm.

Comparative Example 3
The same adhesive as used in Example 1 was applied to a non-woven fabric for electromagnetic shielding (Sewa Electric Co., Ltd., product number E02F3) made of conductive yarn prepared by plating polyester fiber with copper and nickel. The sheet was used as the electromagnetic shielding sheet of Comparative Example 3.

Comparative Example 4
A sheet obtained by applying the same pressure-sensitive adhesive as in Example 2 to the back surface of a copper foil having a thickness of 50 μm was processed as an electromagnetic wave shielding sheet of Comparative Example 4.

Comparative Example 5
100 parts of an acrylic resin emulsion (Aika Aibon RA-280 / Aika Industry Co., Ltd. NV = 50%) 100 dendritic copper powder (Fukuda Metal Foil Powder Co., Ltd., product number FCC-115, average particle size 5 μm) 100 The parts were mixed and kneaded to prepare an electromagnetic shielding water-based paint. The electromagnetic shielding sheet of Comparative Example 5 having a thickness of 450 μm was prepared by applying 300 g / m ^{2 on} the surface of a polyester resin film (150 μm thickness) having a 0.2 mm thick adhesive layer on the back surface of the electromagnetic shielding water-based paint. Created.

Test evaluation method Volume resistivity: After the preparation, a surface resistance value is measured by a four-probe method for those cured at 20 ° C. and 60% humidity for 5 hours, and the volume resistivity is measured from the film thickness.
2. Electromagnetic shielding performance: Measured according to the method according to MIL-STD-285. An antenna (log periodic antenna, guide horn antenna) is countered in an anechoic chamber, and a test piece prepared with a size of 900 mm × 900 mm is inserted between the antennas, and the electric field strength before and after the insertion is measured.
3. Film physical properties: Test sheet type 5 (each width 25 mm ± 1 mm, narrow parallel part width 6 mm ± 0.5 mm, thickness 1 mm or less, distance between marked lines 25 mm ± 0. Example 1, Comparative Example 1 and Comparative Example 5 were peeled off the polyester resin film and the adhesive layer, and Examples 2 to 6 and Comparative Example 2 were release papers. In the state where the pressure-sensitive adhesive layer was peeled off, in Comparative Examples 3 and 4 where no pressure-sensitive adhesive was applied, the strength at break (N / mm ² ) and the elongation until break (%) were measured.
4). Durability test: Each sheet for electromagnetic wave shielding was applied to both corners of a right-angled corner made of gypsum board as the base, and a rubber-based solvent-type adhesive was applied on both sides, and the test piece was allowed to stand under the following conditions (A or B). Observe appearance defects such as peeling and cracking.
○: Good without peeling or cracking. ×: Peeling or cracking occurred
A. Cooling and repetitive test (JIS-A6909-7-10)
-20 ℃ ← → 50 ℃ × 10 cycles
B. High temperature and high humidity test (JIS-K5600-7-2)
50 ° C, 95% RH x 500 hours

The electromagnetic wave shielding sheet according to the present invention has a high electromagnetic wave shielding performance of 20 dB or more and at the same time has excellent film characteristics and durability. Can be easily used for a wide electromagnetic shielding application such as a reflective layer.
Moreover, since the manufacturing method of the electromagnetic wave shielding sheet according to the present invention is to finish by applying an electromagnetic shielding water-based paint to various base materials or various base materials with an adhesive layer, existing coating and drying equipment is used. It can be used to produce high performance electromagnetic shielding sheets.

Claims (5)

An electromagnetic shielding water-based paint prepared by blending a chain-like nickel powder and / or a scale-like nickel powder or a scale-like silver powder or / and a scale-like silver-coated copper powder into a resin emulsion is applied onto a substrate. An electromagnetic shielding sheet characterized by being finished. 2. The electromagnetic wave shielding sheet according to claim 1, wherein a substrate with an adhesive layer is used. The electromagnetic wave shielding sheet according to claim 1, wherein a protective layer is provided on the surface. An electromagnetic shielding water-based paint prepared by blending a chain-like nickel powder and / or a scale-like nickel powder or a scale-like silver powder or / and a scale-like silver-coated copper powder into a resin emulsion is applied on a substrate. A method for producing a sheet for electromagnetic wave shielding, comprising: finishing. 5. The method for producing an electromagnetic wave shielding sheet according to claim 4, wherein a substrate with an adhesive layer is used.