JPH076159B2 - Conductive mixed paper for EMI shield material - Google Patents
Conductive mixed paper for EMI shield materialInfo
- Publication number
- JPH076159B2 JPH076159B2 JP61149470A JP14947086A JPH076159B2 JP H076159 B2 JPH076159 B2 JP H076159B2 JP 61149470 A JP61149470 A JP 61149470A JP 14947086 A JP14947086 A JP 14947086A JP H076159 B2 JPH076159 B2 JP H076159B2
- Authority
- JP
- Japan
- Prior art keywords
- mixed paper
- coated carbon
- metal
- fiber
- carbon fiber
- 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 - Fee Related
Links
- 239000000463 material Substances 0.000 title claims description 10
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 28
- 239000004917 carbon fiber Substances 0.000 claims description 28
- 239000002184 metal Substances 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 13
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 13
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 239000002657 fibrous material Substances 0.000 claims description 4
- 229920003169 water-soluble polymer Polymers 0.000 claims description 4
- 239000000835 fiber Substances 0.000 description 22
- 230000000694 effects Effects 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Chemical Or Physical Treatment Of Fibers (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Paper (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Conductive Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、水溶性高分子物質を付与された切断金属被覆
炭素繊維を含有するEMI（電磁波障害）シールド材用導
電性混抄紙に関するものである。更に詳しくは、集束性
が良好で抄紙分散性に優れた切断Ni（ニッケル、以下本
発明における被覆金属に関し金属とあるは、Niを意味す
る。）被覆炭素繊維を含有するEMIシールド特性に優れ
たEMIシールド材用導電性混抄紙に関するものである。Description: TECHNICAL FIELD The present invention relates to a conductive mixed paper for EMI (electromagnetic interference) shield material containing a cut metal-coated carbon fiber provided with a water-soluble polymer substance. is there. More specifically, it has excellent EMI shielding properties including a cut Ni (nickel, hereinafter referred to as a metal in the coating metal in the present invention means Ni) excellent in bundling property and excellent in papermaking dispersibility. The present invention relates to a conductive mixed paper for EMI shield material.
従来、パルプにカーボンブラック、炭素繊維、金属粉、
金属繊維等に入れた導電性混抄紙が知られている。Conventionally, pulp has carbon black, carbon fiber, metal powder,
A conductive mixed paper made of metal fibers or the like is known.
しかしながら、これらは、いずれも集束性、取扱い作業
性、抄紙分散性、更にはその混抄紙の導電特性等を必ず
しも充分満足させるものではなかった。例えば、炭素繊
維は導電性があり、その混抄紙は静電防止紙として利用
されつつあるが、この混抄紙は、EMIシールド材として
は導電性が不充分で、特に磁界に対するシールド効果が
低い。また、ステンレス繊維等の金属繊維は、導電性に
優れているが、一般に比重が大きく抄紙時繊維が沈み込
み、均一に分散させることが困難であり、従って、金属
繊維を用いた混抄紙は、外観が損われ、更に、シールド
効果にバラツキを生じる。However, none of them sufficiently satisfies the bundling property, the handling workability, the paper-making dispersibility, and the conductive property of the mixed paper. For example, carbon fiber has conductivity, and its mixed paper is being used as an antistatic paper. However, this mixed paper has insufficient conductivity as an EMI shield material, and particularly has a low magnetic field shielding effect. Further, metal fibers such as stainless fibers are excellent in conductivity, but generally the specific gravity is large and the fibers sink during papermaking, and it is difficult to disperse them uniformly. Therefore, a mixed paper using metal fibers is The appearance is impaired, and the shield effect varies.
分散性を向上させるためには、強いて、通常の抄紙条件
よりも攪伴を強くする等条件を苛酷にする必要がある
が、その場合には、例えば金属繊維のような延性な繊維
では、繊維が綿状に絡み一層分散性が悪くなったり、ま
た、炭素繊維のような脆性な繊維では、繊維が切断され
て短くなり、混抄紙の導電性を大幅に低下させることに
なる。In order to improve the dispersibility, it is necessary to make severe the conditions such as making the stirring stronger than usual papermaking conditions.In that case, in the case of ductile fiber such as metal fiber, Are entangled in a cotton shape and the dispersibility is further deteriorated, and in the case of brittle fiber such as carbon fiber, the fiber is cut and shortened, and the conductivity of the mixed paper is significantly reduced.
本発明の目的は、集束性良好で抄紙分散性に優れた切断
金属被覆炭素繊維を含有するEMIシールド材用導電性混
抄紙を提供することである。本発明の混抄紙は、外観が
良好で、且つ、EMIシールド材の特定用途において、導
電性、特にEMIシールド特性に優れたものである。An object of the present invention is to provide a conductive mixed paper for EMI shield material, which contains cut metal-coated carbon fibers having good bundling property and excellent paper making dispersibility. INDUSTRIAL APPLICABILITY The mixed paper of the present invention has a good appearance and is excellent in conductivity, particularly EMI shielding property in a specific application of the EMI shielding material.
本発明は下記の通りである。 The present invention is as follows.
被覆金属のNiの厚さが0.05〜１μｍであるNi被覆炭素繊
維に0.1〜５重量％のポリビニルピロリドン又は／及び
ポリビニルアルコールの水溶性高分子物質を付与した後
切断した、切断Ni被覆炭素繊維と、他の繊維材料とを混
抄してなり、該Ni被覆炭素繊維を10重量％以上含むこと
を特徴とするEMI（電磁波障害）シールド材用導電性混
抄紙。A cut Ni-coated carbon fiber obtained by applying 0.1 to 5% by weight of polyvinylpyrrolidone or / and a polyvinyl alcohol water-soluble polymer substance to Ni-coated carbon fiber having a coating metal Ni thickness of 0.05 to 1 μm. A conductive mixed paper for EMI (electromagnetic interference) shield material, which is made by mixing paper with other fiber material and contains 10% by weight or more of the Ni-coated carbon fiber.
本発明において被覆金属の厚さは0.05〜１μｍである。
0.05μｍ未満では、導電性が不充分で混抄紙の導電性、
特にシールド効果において最良のものが得られず、ま
た、１μｍ超では、金属被覆炭素繊維の比重が大きくな
り抄紙時繊維が沈み込み均一に分散させることが必ずし
も充分でなく、更に、混抄紙の外観の点及びシールド効
果の不均一性の点で最良の結果が得られない（後記の表
３参照）。In the present invention, the coating metal has a thickness of 0.05 to 1 μm.
If it is less than 0.05 μm, the conductivity is insufficient and the conductivity of the mixed paper,
In particular, the best shielding effect cannot be obtained, and if it exceeds 1 μm, the specific gravity of the metal-coated carbon fibers becomes large and it is not always sufficient for the fibers to sink and uniformly disperse during papermaking. And the non-uniformity of the shielding effect are not the best results (see Table 3 below).
更に、同じ重量含有率で含む場合、体積含有率の低下を
きたし、シールド効果が不充分となる（後記の表３参
照）。Furthermore, when the same weight content is included, the volume content is lowered and the shielding effect becomes insufficient (see Table 3 below).
本発明でいう金属被覆炭素繊維とは、例えば、直径５〜
７μｍの単繊維100本程度以上から構成されるポリアク
リロニトリル系、ピッチ系、レーヨン系の炭素質又は黒
鉛質の繊維の表面に電気メッキ、化学メッキ、物理蒸
着、化学蒸着、溶射等の方法により、Ni被覆を形成させ
たものである。The metal-coated carbon fiber referred to in the present invention has, for example, a diameter of 5 to 5.
By the method of electroplating, chemical plating, physical vapor deposition, chemical vapor deposition, thermal spraying, etc. on the surface of polyacrylonitrile-based, pitch-based, rayon-based carbonaceous or graphitic fiber composed of about 100 or more 7 μm single fibers, It is formed with Ni coating.
本発明において水溶性高分子物質の付与（着）量は、0.
1〜５重量％であることが必要である。In the present invention, the applied (deposited) amount of the water-soluble polymer substance is 0.
It is necessary to be 1 to 5% by weight.
0.1重量％未満では、集束性が不充分で作業中に飛散し
取扱い作業性が悪くなり、また、綿状に絡み抄紙分散性
が悪くなる。５重量％超では、集束性が強過ぎ、同じく
抄紙分散性が悪くなり、混抄紙の外観を損ない、更にEM
Iシールド効果にバラツキを生じる（後記の表１参
照）。If it is less than 0.1% by weight, the sizing property is insufficient and the particles are scattered during the work, resulting in poor workability and entanglement in a cotton-like shape, resulting in poor papermaking dispersibility. If it exceeds 5% by weight, the bundling property will be too strong, and the dispersibility in papermaking will also deteriorate, and the appearance of the mixed paper will be impaired.
I-Shield effect varies (see Table 1 below).
本発明において高分子物質は、水に可溶なポリビニルピ
ロリドン又はポリビニルアルコールが通常の抄紙方法に
適し、且つ、取扱い作業性が良好であるという点におい
て最適である。ポリビニルピロリドン又はポリビニルア
ルコールの付与は、これを溶解した水溶液中に金属被覆
炭素繊維を浸漬又は通過させることにより行われる。In the present invention, as the polymer substance, polyvinylpyrrolidone or polyvinyl alcohol which is soluble in water is optimal in that it is suitable for ordinary papermaking methods and has good workability. The application of polyvinylpyrrolidone or polyvinyl alcohol is performed by immersing or passing the metal-coated carbon fiber in an aqueous solution in which it is dissolved.
本発明の導電性混抄紙は、前述の切断金属被覆炭素繊維
と他の繊維材料とを混抄したもので、該金属被覆炭素繊
維を10重量％以上含むものである。含有量が10重量％未
満では、導電性、特にEMIシールド効果の優れたものが
得られない（後記の表２参照）。The electrically conductive mixed paper of the present invention is a mixture of the above-mentioned cut metal-coated carbon fiber and another fiber material, and contains 10% by weight or more of the metal-coated carbon fiber. When the content is less than 10% by weight, it is not possible to obtain a conductive material, particularly, an excellent EMI shielding effect (see Table 2 below).
混抄方法は通常の抄紙方法が採用可能であり、混抄相手
である他の繊維材料は、例えばパルプ、アスベスト繊
維、ガラス繊維、炭素繊維等である。An ordinary papermaking method can be adopted as the mixed paper making method, and the other fiber material as a mixed paper making partner is, for example, pulp, asbestos fiber, glass fiber, carbon fiber or the like.
本発明における加工した切断金属被覆炭素繊維は、表１
に示すように集束性が良好で、且つ、分散性に優れてお
り、このものを含有する本発明混抄紙、例えばパルプと
の混抄紙は、外観が良好で導電性、EMIシールド効果の
バラツキがなく、静電防止紙としては勿論、EMIシール
ド材（紙）として電界、磁界の両方に対して極めて優れ
た効果を発揮する。The processed cut metal-coated carbon fibers of the present invention are shown in Table 1.
As shown in Fig. 3, good converging property, and excellent in dispersibility, mixed paper of the present invention containing this, for example, a mixed paper with pulp, good appearance, conductivity, variation in EMI shielding effect. Not only as an anti-static paper but also as an EMI shield material (paper), it has an extremely excellent effect on both electric and magnetic fields.
本発明における加工された切断金属被覆炭素繊維は、導
電性が炭素繊維より高く、比重が金属被覆より低いた
め、このものを含有する混抄紙は、EMIシールド紙とし
て要求される導電性が均一に分散し、且つ、高導電性、
高シールド性が得られ、EMIシールド材として最適であ
る。The processed cut metal-coated carbon fiber in the present invention has a higher conductivity than the carbon fiber and a specific gravity lower than that of the metal coating, and thus the mixed paper containing the same has a uniform conductivity required as an EMI shielding paper. Disperse and high conductivity,
High shielding property is obtained and it is most suitable as EMI shield material.
〔実施例〕 以下、実施例及び比較例における被覆金属はいずれもNi
である。 [Examples] Hereinafter, the coating metals in Examples and Comparative Examples are all Ni
Is.
実施例１（比較例も含む。） ポリビニルピロリドン（PVP）を溶解した水溶液に、被
覆金属の厚さが0.25μｍであるNi被覆炭素繊維束を浸漬
し、PVPを0.8重量％（本発明例）、7.2重量％（比較
例）になるように付与し、乾燥して、得られた繊維束を
6mmに切断してチョップドファイバーを作成した。Example 1 (including comparative examples) Ni-coated carbon fiber bundles having a coating metal thickness of 0.25 μm were immersed in an aqueous solution in which polyvinylpyrrolidone (PVP) was dissolved, and 0.8% by weight of PVP (invention example) , 7.2% by weight (comparative example), and dried to obtain the obtained fiber bundle.
A chopped fiber was prepared by cutting it to 6 mm.
比較のため、PVPを付与していない6mmのチョップドファ
イバーを作成した。For comparison, a 6 mm chopped fiber without PVP was prepared.
このチョップドファイバーを通常の方法で、パルプと混
抄し金属被覆炭素繊維含有率60重量％、坪量80g/m2の混
抄紙を抄紙した。This chopped fiber was mixed with pulp by a usual method to make a mixed paper having a metal-coated carbon fiber content of 60% by weight and a basis weight of 80 g / m 2 .
金属被覆炭素繊維の集束性及び混抄紙中の分散性、EMI
シールド効果を測定した。その結果を表２に示す。Concentration of metal coated carbon fiber, dispersibility in mixed paper, EMI
The shield effect was measured. The results are shown in Table 2.
実施例２（比較例も含む。） ポリビニルアルコール（PVA）を溶解した水溶液に、被
覆金属の厚さが、それぞれ0.03μｍ（比較例）、0.26μ
ｍ（本発明例）、1.21μｍ（比較例）であるNi被覆炭素
繊維を浸漬し、PVAを1.0重量％になるように付与し、乾
燥し、6mmに切断してチョップドファイバーを作成し
た。このものを用いて実施例１と同様にして混抄紙を抄
紙した。 Example 2 (including a comparative example) The thickness of the coating metal was 0.03 μm (comparative example) and 0.26 μm in an aqueous solution in which polyvinyl alcohol (PVA) was dissolved.
m (inventive example) and 1.21 μm (comparative example) Ni-coated carbon fibers were dipped, PVA was added to 1.0% by weight, dried, and cut into 6 mm to prepare chopped fibers. Using this, a mixed paper was made in the same manner as in Example 1.
EMIシールド効果を測定した結果を表３に示す。Table 3 shows the results of measuring the EMI shielding effect.
実施例３（比較例も含む。） ポリビニルピロリドン（PVP）を溶解した水溶液に、被
覆金属の厚さが0.25μｍであるNi被覆炭素繊維束を浸漬
し、PVPを0.6重量％になるように付与し、乾燥し、得ら
れた繊維束を6mmに切断し、金属被覆炭素繊維含有率７
重量％（比較例）及び65重量％（本発明例）〔坪量は共
に70g/m2〕のパルプとの混抄紙を抄紙した。 Example 3 (including comparative examples) Ni-coated carbon fiber bundles having a coating metal thickness of 0.25 μm were dipped in an aqueous solution in which polyvinylpyrrolidone (PVP) was dissolved, and PVP was added to 0.6% by weight. Then, the resulting fiber bundle is cut into 6 mm, and the metal-coated carbon fiber content is 7
Papers were mixed with wt% (comparative example) and 65 wt% (inventive example) [both basis weight was 70 g / m 2 ] pulp.
EMIシールド効果を測定した結果を表４に示す。Table 4 shows the results of measuring the EMI shielding effect.
実施例４〜７ ポリビニルピロリドンを溶解した水溶液に、0.25μｍの
Ni被覆炭素繊維束を浸漬し、ポリビニルピロリドンを0.
8重量％になるように付与し、得られた繊維束を6mmに切
断し、金属被覆炭素繊維チョップドファイバーを作製し
た。 Examples 4 to 7 In an aqueous solution in which polyvinylpyrrolidone was dissolved, 0.25 μm
Immerse Ni-coated carbon fiber bundles and add polyvinylpyrrolidone to 0.
8% by weight was applied, and the obtained fiber bundle was cut into 6 mm to prepare metal-coated carbon fiber chopped fiber.
チョップドファイバーを表５に示す含有量になるよう通
常の方法でパルプと混抄し導電性混抄紙を得た。EMIシ
ールド効果を測定した結果を表５に示す。The chopped fiber was mixed with pulp by a usual method so as to have the content shown in Table 5 to obtain a conductive mixed paper. Table 5 shows the results of measuring the EMI shielding effect.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０５Ｋ 9/00 Ｗ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display H05K 9/00 W
Claims (1)
Ni被覆炭素繊維に0.1〜５重量％のポリビニルピロリド
ン又は／及びポリビニルアルコールの水溶性高分子物質
を付与した後切断した、切断Ni被覆炭素繊維と、他の繊
維材料とを混抄してなり、該Ni被覆炭素繊維を10重量％
以上含むことを特徴とするEMI（電磁波障害）シールド
材用導電性混抄紙。1. The coating metal has a Ni thickness of 0.05 to 1 μm.
Ni-coated carbon fibers are mixed with 0.1-5 wt% of polyvinylpyrrolidone or / and polyvinyl alcohol water-soluble polymer substance and then cut, and the cut Ni-coated carbon fibers are mixed with other fiber materials, 10% by weight of Ni-coated carbon fiber
A conductive mixed paper for EMI (electromagnetic interference) shield material, which includes the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61149470A JPH076159B2 (en) | 1986-06-27 | 1986-06-27 | Conductive mixed paper for EMI shield material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61149470A JPH076159B2 (en) | 1986-06-27 | 1986-06-27 | Conductive mixed paper for EMI shield material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS636169A JPS636169A (en) | 1988-01-12 |
| JPH076159B2 true JPH076159B2 (en) | 1995-01-30 |
Family
ID=15475840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61149470A Expired - Fee Related JPH076159B2 (en) | 1986-06-27 | 1986-06-27 | Conductive mixed paper for EMI shield material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH076159B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01187896A (en) * | 1988-01-21 | 1989-07-27 | Nec Corp | Material for radio wave absorber |
| JPH0639512Y2 (en) * | 1988-04-25 | 1994-10-12 | タキロン株式会社 | Architectural makeup panel |
| JP2002180372A (en) * | 2000-12-15 | 2002-06-26 | Toho Tenax Co Ltd | Metal oxide-coated carbon fiber and method for producing the same |
| CN109281159B (en) * | 2017-07-21 | 2021-09-03 | 天津大学 | Copper-plated carbon fiber with heat conduction anisotropy and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5761800A (en) * | 1980-09-30 | 1982-04-14 | Toho Beslon Co | Papermaking carbon fiber material and method |
| ATE28911T1 (en) * | 1983-09-12 | 1987-08-15 | American Cyanamid Co | CONDUCTIVE FIBER MAT. |
-
1986
- 1986-06-27 JP JP61149470A patent/JPH076159B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS636169A (en) | 1988-01-12 |
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