JPH0528164B2 - - Google Patents
Info
- Publication number
- JPH0528164B2 JPH0528164B2 JP60208358A JP20835885A JPH0528164B2 JP H0528164 B2 JPH0528164 B2 JP H0528164B2 JP 60208358 A JP60208358 A JP 60208358A JP 20835885 A JP20835885 A JP 20835885A JP H0528164 B2 JPH0528164 B2 JP H0528164B2
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic shielding
- shielding material
- sheet
- conductive
- conductive paint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 36
- 239000003973 paint Substances 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 13
- 239000004745 nonwoven fabric Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007763 reverse roll coating Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
〔産業上の利用分野〕
本発明は、繊維質からなるシートに導電性を持
たせた電磁性シールド材の製造方法に関するもの
である。
〔従来の技術〕
各種の電子機器で、機器内の部品から発生する
電磁波が他の部品に悪影響を及ぼすことを防止す
るため、および外部からの電磁波が機器内の電子
部品に悪影響を及ぼすことを防止するため、電子
部品を電磁波シールド材で覆う必要がある。かゝ
る目的で使用される電磁波シールド材には、例え
ば第３図に示すような繊維シート１の上に導電性
塗料２を塗布した構造のものが知られている。こ
の様な断面の電磁波シールド材を所望の形状に成
形し、シールドしようとする電子部品を覆いアー
スを取る。このとき、第３図に示す従来の電磁波
シールド材のように、片面しか導電性が無いとア
ースが取りにくい。また両面に導電性が有つて
も、シールド材の断面全体に導電性がないと断面
の端部に導体を突き当てゝアースをとろうとした
とき絶縁されやすく、完全なアースが取りにくい
という欠点が有つた。そのため、繊維シートを基
材とする電磁波シールド材においても、金属を基
材とする電磁波シールド材と同様に電磁波シール
ド材全体に渡つて導電性を有することが望まし
い。
ところが不織布などの繊維質からなるシート全
体に導電性塗料を均一に含浸させることが非常に
困難であり、望まれるような電磁波シールド材は
存在しない。導電性塗料は、例えばアクリル樹脂
やウレタン樹脂（バインダ成分）をトルエンや酢
酸エチルなどの有機溶剤に溶解したベースの塗料
に、例えば銅、銀、ニツケル、カーボンなどの導
電性粉末を混合してある。このような組成の導電
性塗料は、繊維シートに塗布してもバインダ成分
だけがシート内部に浸透してゆき、銅などの導電
性粉末成分は表面に残存してしまう。そのため、
電磁波シールド材全体に渡つて導電性を有するよ
うにはならず、表面だけが導電性を有することに
なる。
〔発明が解決しようとする問題点〕
本発明は、上記のような理由により従来存在し
なかつた、繊維質からなるシート全体に渡つて導
電性を有する電磁波シールド材の製造方法を提供
することを目的とするものである。
〔問題点を解決するための手段〕
上記の問題点を解決するための本発明を適用す
る電磁波シールド材の製造方法は、第１図に示す
ように、以下の手順による。(a)先ず繊維質からな
るシート１に架橋硬化型樹脂３を含浸する。(b)次
にそのシート１に導電性塗料２を塗布する。(c)こ
のようにして樹脂を含浸し、導電性塗料を塗布し
たシート１の表面を加圧しながら成形する。
〔作用〕
架橋硬化型樹脂３が含浸され、導電性塗料２が
塗布されているシート１の表面が加圧されると、
導電性塗料のバインダ成分と共に導電性粉末成分
も繊維基材内部に浸透してゆきながら、成形がさ
れる。
〔実施例〕
以下、本発明を適用する電磁波シールド材の製
造方法の実施例を第１図により詳細に説明する。
先ず、ポリエステル繊維を原料にして常法によ
り得た乾式不織布１を、(a)に示すように、未硬化
樹脂液３に浸漬する。樹脂液３が含浸している不
織布１の表面に、(b)に示すようにリバースロール
コートで導電性塗料２を塗布する。次に、(c)に示
すように、この不織布１を金型５ａと５ｂにより
加圧成形する。すると(d)に示すような所望の形の
電磁波シールド材の成形品１０を得ることができ
る。なお７はシールドすべき電子部品が位置する
空間である。また架橋硬化型樹脂３が加熱硬化性
の場合は、金型５ａと５ｂによる加圧成形は加熱
雰囲気中で行う。
上記の製造工程で、第２図に示すように、不織
布１の表面に塗布されている導電性塗料２イが加
圧により不織布１の内部に浸透してゆきながら成
形がされるロ。予め不織布１には樹脂液３が含浸
してあり、導電性塗料のバインダ成分と共に導電
性粉末成分も充分に浸透してゆき、電磁波シール
ド材全体が導電性になる。そしてシールド性能は
他の電磁波シールド材に比べて損色のないもので
ある。なお不織布１に予め樹脂液が含浸してない
と、導電性塗料のバインダ成分だけが浸透してゆ
き、導電性粉末成分は表面に残留してしまう。そ
のため電磁波シールド材の表面だけが導電性にな
つてしまう。
以下に本発明を適用した方法で製造した電磁波
シールド材（本発明品）と従来の電磁波シールド
材を示し性能評価をする。
本発明品ポリエステル繊維の目付量が70ｇ／m2
の不織布を基材である繊維シートとしている。第
１図ａで含浸させる樹脂３はフエノール樹脂であ
る。また第１図ｂで塗布する導電性塗料２はアク
リル樹脂をバインダ成分にし、銅粉末を導電性成
分としてアセトンに溶解したもので、乾燥後の厚
さを50μｍにする。第２図ロに示すように、電磁
波シールド材は全体に渡つて均質なものになつて
いる。
従来品ポリエステル繊維目付量が100ｇ／m2の
不織布を基材である繊維シートとしている。第１
図ａの工程は採らず、樹脂の含浸していない繊維
シート１に導電性塗料２を塗布する。導電性塗料
は、例１と同じくアクリル樹脂をバインダ成分に
し、銅粉末を導電性成分とするもので、乾燥後の
厚さを50μｍにする。第３図に示すように、電磁
波シールド材は不織布１の片面に導電性塗料２が
塗布されている。
本発明品・従来品のシールド性能は下表の通り
である。高周波電界（周波数単位ＭHz）の減衰特
性（単位dB）で表している。
[Industrial Application Field] The present invention relates to a method for producing an electromagnetic shielding material in which a fibrous sheet is made conductive. [Prior Art] In various electronic devices, it is necessary to prevent electromagnetic waves generated from internal parts of the device from having a negative effect on other parts, and to prevent electromagnetic waves from outside from having a negative effect on the electronic components inside the device. To prevent this, it is necessary to cover electronic components with electromagnetic shielding material. As an electromagnetic wave shielding material used for such a purpose, one having a structure in which a conductive paint 2 is applied on a fiber sheet 1 as shown in FIG. 3, for example, is known. An electromagnetic wave shielding material having such a cross section is formed into a desired shape, and the electronic component to be shielded is covered and grounded. At this time, if only one side is conductive like the conventional electromagnetic shielding material shown in FIG. 3, it is difficult to ground the material. In addition, even if both sides are conductive, if the entire cross section of the shield material is not conductive, when you try to connect a conductor to the end of the cross section to connect it to the ground, it is likely to be insulated, making it difficult to establish a complete ground. There was. Therefore, it is desirable that the electromagnetic shielding material having a fiber sheet as a base material has conductivity throughout the entire electromagnetic shielding material, similar to the electromagnetic shielding material having a metal base material. However, it is very difficult to uniformly impregnate the entire sheet made of fibrous materials such as nonwoven fabric with conductive paint, and there is no electromagnetic shielding material that is desired. Conductive paints are made by mixing conductive powders such as copper, silver, nickel, and carbon into a base paint made by dissolving acrylic resin or urethane resin (binder component) in an organic solvent such as toluene or ethyl acetate. . Even when a conductive paint having such a composition is applied to a fiber sheet, only the binder component permeates into the interior of the sheet, and conductive powder components such as copper remain on the surface. Therefore,
The entire electromagnetic shielding material does not have conductivity, but only the surface has conductivity. [Problems to be Solved by the Invention] The present invention aims to provide a method for producing an electromagnetic shielding material that has conductivity throughout the entire sheet made of fibers, which has not existed in the past due to the above-mentioned reasons. This is the purpose. [Means for Solving the Problems] A method for manufacturing an electromagnetic shielding material to which the present invention is applied in order to solve the above problems, as shown in FIG. 1, is based on the following procedure. (a) First, a fibrous sheet 1 is impregnated with a crosslinked curable resin 3. (b) Next, conductive paint 2 is applied to the sheet 1. (c) The surface of the sheet 1 impregnated with resin and coated with conductive paint is molded under pressure. [Operation] When the surface of the sheet 1 impregnated with the cross-linked curable resin 3 and coated with the conductive paint 2 is pressurized,
Molding is carried out while the conductive powder component as well as the binder component of the conductive paint permeates inside the fiber base material. [Example] Hereinafter, an example of a method for manufacturing an electromagnetic shielding material to which the present invention is applied will be described in detail with reference to FIG. First, a dry nonwoven fabric 1 obtained by a conventional method using polyester fibers as a raw material is immersed in an uncured resin liquid 3 as shown in (a). The conductive paint 2 is applied to the surface of the nonwoven fabric 1 impregnated with the resin liquid 3 by reverse roll coating as shown in (b). Next, as shown in (c), this nonwoven fabric 1 is pressure-molded using molds 5a and 5b. Then, a molded product 10 of the electromagnetic shielding material having a desired shape as shown in (d) can be obtained. Note that 7 is a space in which electronic components to be shielded are located. Further, when the crosslinked curable resin 3 is heat curable, pressure molding using the molds 5a and 5b is performed in a heated atmosphere. In the above manufacturing process, as shown in FIG. 2, the conductive paint 2a applied to the surface of the nonwoven fabric 1 permeates into the inside of the nonwoven fabric 1 under pressure, and the nonwoven fabric 1 is molded. The nonwoven fabric 1 is impregnated with a resin liquid 3 in advance, and the conductive powder component as well as the binder component of the conductive paint permeates sufficiently, making the entire electromagnetic shielding material conductive. And its shielding performance is comparable to other electromagnetic shielding materials. Note that if the nonwoven fabric 1 is not impregnated with the resin liquid in advance, only the binder component of the conductive paint will penetrate, and the conductive powder component will remain on the surface. Therefore, only the surface of the electromagnetic shielding material becomes conductive. Below, an electromagnetic shielding material manufactured by the method to which the present invention is applied (product of the present invention) and a conventional electromagnetic shielding material will be shown and their performance will be evaluated. The basis weight of the polyester fiber of the present invention is 70g/m 2
The nonwoven fabric is used as the base material of the fiber sheet. The resin 3 impregnated in FIG. 1a is a phenolic resin. The conductive paint 2 applied in FIG. 1b is made by dissolving acrylic resin as a binder component and copper powder as a conductive component in acetone, and has a thickness of 50 μm after drying. As shown in FIG. 2B, the electromagnetic shielding material is uniform throughout. Conventional product The base material of the fiber sheet is a nonwoven fabric with a polyester fiber basis weight of 100 g/m 2 . 1st
The process shown in Figure a is not taken, and the conductive paint 2 is applied to the fiber sheet 1 which is not impregnated with resin. The conductive paint used acrylic resin as a binder component and copper powder as a conductive component, as in Example 1, and had a thickness of 50 μm after drying. As shown in FIG. 3, the electromagnetic shielding material has a nonwoven fabric 1 coated with a conductive paint 2 on one side. The shielding performance of the product of the present invention and the conventional product is shown in the table below. It is expressed as the attenuation characteristic (unit: dB) of a high-frequency electric field (frequency unit: MHz).
以上説明したように、本発明を適用した方法で
電磁波シールド材を製造すると、繊維基材内部に
導電性塗料が均一に浸透してゆきながら成形がさ
れる。
したがつて製造された電磁波シールド材は、シ
ート全体に渡つて導電性を有するので、シールド
性能が従来品に比べて優れている。また本発明の
方法で製造した電磁波シールド材のシールド性能
は、従来品のシールド性能より優れている。実装
に際して任意の個所で導通が得られるので、便利
であり、またアースを取つたりする際に確実なも
のになるという利点もある。
As explained above, when an electromagnetic shielding material is manufactured by the method to which the present invention is applied, the conductive paint is uniformly permeated into the fiber base material while being molded. Therefore, the electromagnetic shielding material manufactured in this manner has conductivity throughout the sheet, and therefore has superior shielding performance compared to conventional products. Further, the shielding performance of the electromagnetic shielding material manufactured by the method of the present invention is superior to that of conventional products. It is convenient because continuity can be obtained at any point during mounting, and it also has the advantage of being reliable when connecting to the ground.
第１図は本発明を適用する電磁波シールド材の
製造方法の実施例を説明する図、第２図はその要
部拡大断面図、第３図は従来の電磁波シールド材
の断面図である。
１……繊維シート、２……導電性塗料、３……
架橋硬化型樹脂、５ａ・５ｂ……金型、６……ポ
リエステルフイルム、７……空間、１０……電磁
波シールド材の成形品。
FIG. 1 is a diagram illustrating an embodiment of a method for manufacturing an electromagnetic shielding material to which the present invention is applied, FIG. 2 is an enlarged cross-sectional view of a main part thereof, and FIG. 3 is a cross-sectional view of a conventional electromagnetic shielding material. 1... Fiber sheet, 2... Conductive paint, 3...
Cross-linked curable resin, 5a and 5b...mold, 6...polyester film, 7...space, 10...molded product of electromagnetic shielding material.
Claims (1)
浸し、前記により樹脂を含浸したシートに導電性
塗料を塗布し、前記により樹脂を含浸し導電性塗
料を塗布したシートの表面を加圧して塗布してあ
る導電性塗料をシート内部に浸透させながら成形
することを特徴とする電磁波シールド材の製造方
法。1 Impregnating a fibrous sheet with a cross-linked curable resin, applying a conductive paint to the resin-impregnated sheet as described above, and applying pressure to the surface of the sheet impregnated with the resin and coated with the conductive paint as described above. A method for manufacturing an electromagnetic shielding material, which comprises molding a sheet while infiltrating the interior of the sheet with a conductive paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60208358A JPS6268731A (en) | 1985-09-20 | 1985-09-20 | Electromagnetic wave shielding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60208358A JPS6268731A (en) | 1985-09-20 | 1985-09-20 | Electromagnetic wave shielding material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6268731A JPS6268731A (en) | 1987-03-28 |
| JPH0528164B2 true JPH0528164B2 (en) | 1993-04-23 |
Family
ID=16554967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60208358A Granted JPS6268731A (en) | 1985-09-20 | 1985-09-20 | Electromagnetic wave shielding material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6268731A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5105043B2 (en) * | 2006-03-27 | 2012-12-19 | Ｔｄｋ株式会社 | Radio wave absorbing laminate, radio wave absorber, and method of manufacturing radio wave absorber |
-
1985
- 1985-09-20 JP JP60208358A patent/JPS6268731A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6268731A (en) | 1987-03-28 |
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