JPH03191598A - Manufacture of sheet for electromagnetic-wave shielding use - Google Patents
Manufacture of sheet for electromagnetic-wave shielding useInfo
- Publication number
- JPH03191598A JPH03191598A JP32949589A JP32949589A JPH03191598A JP H03191598 A JPH03191598 A JP H03191598A JP 32949589 A JP32949589 A JP 32949589A JP 32949589 A JP32949589 A JP 32949589A JP H03191598 A JPH03191598 A JP H03191598A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- conductive
- electromagnetic
- flame retardant
- electromagnetic shielding
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000835 fiber Substances 0.000 claims abstract description 37
- 239000003063 flame retardant Substances 0.000 claims abstract description 22
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims abstract description 13
- 239000005033 polyvinylidene chloride Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 abstract description 19
- 238000005470 impregnation Methods 0.000 abstract description 10
- 239000011248 coating agent Substances 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 7
- 238000003672 processing method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 6
- 230000005684 electric field Effects 0.000 description 6
- 229920003043 Cellulose fiber Polymers 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 3
- 239000004816 latex Substances 0.000 description 3
- 229920000126 latex Polymers 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 229920000131 polyvinylidene Polymers 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000012209 synthetic fiber Substances 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000013054 paper strength agent Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 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
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- NPSSWQJHYLDCNV-UHFFFAOYSA-N prop-2-enoic acid;hydrochloride Chemical compound Cl.OC(=O)C=C NPSSWQJHYLDCNV-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Paper (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、優れた電磁波シールド効果を有し、かつ優れ
た難燃性および耐水性を有する壁材、床材および天井材
等の建築内装材に使用可能な電磁波シールド用シートの
製造方法に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to architectural interiors such as wall materials, floor materials, ceiling materials, etc., which have an excellent electromagnetic shielding effect, and have excellent flame retardancy and water resistance. The present invention relates to a method of manufacturing an electromagnetic shielding sheet that can be used as a material.
〈従来の技術〉
近年、エレクトロニクスの急激な発展に伴い、その筐体
のプラスチック化によりコンピューターなどの電子機器
の誤動作となる電磁波障害が大きな社会問題になって来
た。この電磁波障害を未然に防止する手段としては、電
子機器の筐体を、亜鉛溶射、金属蒸着、化学メツキ等の
表面処理や導電性材料との混合による複合化によって、
導電化して発生源の不要電波を封じ込める能動的シール
ドと建屋の壁、床、天井等を導電化する事により外部か
ら屋内に侵入する不要電波を遮断する受動的シールドと
がある。この中で受動的シールドとして壁、床、天井等
を導電化して電磁波シールドを行う場合には、それらの
建築内装材に導電材料を積層、混合、塗布、印刷等の方
法で複合化することが考えられている。しかし上記の如
き建築内装材を導電化する場合は、電子機器の筐体を導
電化する場合と異って、大面積を連続一体止して導電化
しなければならず、しかも、これら建築内装材には長期
に亘って安定な難燃性および耐水性も要求される。従来
これらの建築内装材を導電化する手段として天然繊維あ
るいは合成繊維と導電性繊維とを通常の湿式抄造法で抄
造して作成した導電性シートをグアニジン系難燃剤の塗
工、あるいは含浸等の方法で難燃化処理することが提案
されていた。しかしながらこの場合は、バインダーを含
む難燃剤粒子が導電性繊維間に侵入し、導電性繊維同志
の接触を妨げる働きをするため、電磁波シールド効果が
低下するという問題を有するものであった。このため廉
価で難燃性及び耐水性の優れた電磁波シールド用シート
としては今まで満足すべき物は生み出されていない。<Prior Art> In recent years, with the rapid development of electronics, electromagnetic interference, which causes electronic devices such as computers to malfunction, has become a major social problem due to the use of plastic housings. As a means to prevent this electromagnetic interference, the casing of electronic equipment is treated with surface treatments such as zinc spraying, metal vapor deposition, chemical plating, etc., or composited by mixing with conductive materials.
There are two types of shields: active shielding, which makes the building's walls, floors, ceilings, etc. conductive to block unwanted radio waves from entering the building from the outside. In this case, when electromagnetic wave shielding is performed by making walls, floors, ceilings, etc. conductive as passive shields, it is possible to combine conductive materials with such architectural interior materials by laminating, mixing, coating, printing, etc. It is considered. However, when making architectural interior materials such as those mentioned above conductive, unlike when making the casing of an electronic device conductive, a large area must be made conductive in one continuous piece.Moreover, these interior materials It also requires long-term stable flame retardancy and water resistance. Conventionally, as a means to make these architectural interior materials conductive, conductive sheets made by forming natural fibers or synthetic fibers and conductive fibers using a normal wet paper-making method are coated with guanidine-based flame retardants, or impregnated with them. It was proposed that flame retardant treatment be performed using a method. However, in this case, the flame retardant particles containing the binder penetrate between the conductive fibers and serve to prevent contact between the conductive fibers, resulting in a problem in that the electromagnetic shielding effect is reduced. For this reason, a satisfactory electromagnetic shielding sheet that is inexpensive and has excellent flame retardancy and water resistance has not been produced to date.
〈発明が解決しようとする問題点〉
本発明は上記の如き実情に鑑みてなされたものであり、
建築内装材等の用途として大面積を連続一体止して十分
に導電化することができ、かっ難燃性および耐水性の優
れた電磁波シールド用シートの製造方法を提供するもの
である。<Problems to be solved by the invention> The present invention has been made in view of the above-mentioned circumstances,
The present invention provides a method for producing an electromagnetic shielding sheet that can be continuously bonded over a large area and made sufficiently conductive for use as a building interior material, etc., and has excellent flame retardancy and water resistance.
〈問題点を解決するための手段〉
即ち、本発明は、導電性繊維を全繊維中に３０〜９５重
量％配合した原料を湿式抄造法により抄造して導電性シ
ートを作成し、然るのち該導電性シートに対しポリ塩化
ビニリデン（以下、ＰＶＤＣと称す）系難燃剤を含浸処
理することを特徴とする電磁波シールド用シートの製造
方法に関するものである。<Means for solving the problem> That is, in the present invention, a conductive sheet is produced by forming a raw material containing 30 to 95% by weight of conductive fibers into the total fibers by a wet papermaking method, and then The present invention relates to a method for producing an electromagnetic shielding sheet, which comprises impregnating the conductive sheet with a polyvinylidene chloride (hereinafter referred to as PVDC) flame retardant.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
本発明の導電性シートを構成する導電性繊維としては、
ステンレス鋼、黄銅、銅、アルミニウム、ニッケル、鉛
などの金属の単体または合金から作られた金属繊維、あ
るいは、植物繊維、合成繊維、無機繊維などの表面に金
属を蒸着、メツキ、塗布等の処理をした金属化繊維など
を挙げることが出来る。The conductive fibers constituting the conductive sheet of the present invention include:
Processing such as vapor deposition, plating, or coating of metal on the surface of metal fibers made from single metals or alloys such as stainless steel, brass, copper, aluminum, nickel, and lead, or vegetable fibers, synthetic fibers, and inorganic fibers. Examples include metallized fibers.
これらの導電性繊維を使って導電性シートを湿式抄造す
る際には、１種または２種以上のセルロース繊維、ポリ
ビニルアルコール繊維等導電性繊維間の結着機能を有す
る天然繊維や合成繊維を補助繊維として抄紙原料に加え
るが、その他製紙用薬品、填料など製品の用途・特性に
より適宜選択された添加剤が原料に添加される。When wet-forming conductive sheets using these conductive fibers, one or more types of cellulose fibers, polyvinyl alcohol fibers, and other natural fibers or synthetic fibers that have a binding function between conductive fibers are used to assist. It is added to the papermaking raw material as fiber, but other additives, such as papermaking chemicals and fillers, are also added to the raw material, which are appropriately selected depending on the intended use and characteristics of the product.
この場合、導電性繊維と補助繊維とからなる全繊維成分
中における該導電性繊維の割合は重量比で３０〜９５％
である事が必要である。導電性繊維の割合が３０％未満
であると、得られた導電性シートでは十分な電磁波シー
ルド特性が得られず、また９５％を越えると、導電性繊
維間の結合力が低下し、導電性シートとして本発明を構
成する次工程に必要な十分な物理特性が得られず、内装
材としての必要最低限の強度特性を保持する事が出来な
い。In this case, the proportion of the conductive fibers in the total fiber component consisting of the conductive fibers and the auxiliary fibers is 30 to 95% by weight.
It is necessary that If the proportion of conductive fibers is less than 30%, the obtained conductive sheet will not have sufficient electromagnetic shielding properties, and if it exceeds 95%, the bonding force between the conductive fibers will decrease, and the conductive sheet will not have sufficient electromagnetic shielding properties. It is not possible to obtain sufficient physical properties necessary for the next step of constructing the present invention as a sheet, and it is not possible to maintain the minimum necessary strength properties as an interior material.
上記の原料を用いて本発明を構成する導電性シートを作
成するには、これらの原料を水に分散したスラリーを通
常の円網式もしくは長編式等の抄紙機により抄造すれば
よい。In order to produce the conductive sheet constituting the present invention using the above-mentioned raw materials, a slurry in which these raw materials are dispersed in water may be made into paper using a conventional cylinder type or long type paper machine.
上記の工程により得られた導電性シートに対し、次の工
程としてラテックス状のＰＶＤＣ系難燃剤を含浸処理す
ることにより、本発明の製造方法を実施することが出来
る。The manufacturing method of the present invention can be carried out by impregnating the conductive sheet obtained through the above steps with a latex-like PVDC flame retardant as the next step.
本発明で云う含浸処理とは、抄紙機より抄造する導電性
シートに対し、該抄紙工程中にサイズプレスでラテック
ス状のＰＶＤＣ系難燃剤を塗工あるいは含浸し、付着さ
せる方法でも、あるいは−旦抄紙機で導電性シートを作
成した後、他の塗工機あるいは含浸機によりラテックス
状のＰＶＤＣ系難燃剤を塗工あるいは含浸し、付着させ
る方法でもよい。The impregnation treatment referred to in the present invention may be a method in which a latex-like PVDC flame retardant is coated or impregnated with a size press during the paper-making process to adhere it to the conductive sheet made by a paper machine, or A method may also be used in which a conductive sheet is created using a paper machine, and then coated or impregnated with a latex-like PVDC flame retardant using another coating machine or impregnating machine, and then adhered to the conductive sheet.
本発明で云うＰＶＤＣ系難燃剤としては、ポリ塩化ビニ
リデン−塩化ビニル共重合体、ポリ塩化ビニリデン−ア
クリルニトリル共重合体、ポリ塩化ビニリデン−アクリ
ル酸エステル共重合体等を主成分としたものが挙げられ
る。また建材として本発明を実施する場合は、抄造原料
にＪＩＳ−Ａ−１３２２に定める難燃性材料を選択して
配合することが好ましい。特に抄造原料として易燃性材
料を用いる場合は、含燐、含ハロゲン、含硫黄、無機防
災剤などの防災、難燃剤を適宜選択、組合せて、湿式抄
紙原料にあらかじめ内添することが出来る。Examples of the PVDC flame retardant used in the present invention include those mainly composed of polyvinylidene chloride-vinyl chloride copolymer, polyvinylidene chloride-acrylonitrile copolymer, polyvinylidene chloride-acrylic acid ester copolymer, etc. It will be done. Further, when the present invention is implemented as a building material, it is preferable to select and blend flame-retardant materials specified in JIS-A-1322 into the papermaking raw material. In particular, when using combustible materials as papermaking raw materials, disaster prevention and flame retardants such as phosphorus-containing, halogen-containing, sulfur-containing, and inorganic disaster prevention agents can be appropriately selected and combined and added internally to the wet papermaking raw materials in advance.
このｐｖｏｃ系難燃剤を湿式抄造により得た導電性繊維
シートに含浸する場合、付着量を乾燥後の重量で１０〜
１５ｇ／ｗ”とする事が好ましく、これによりＪ ｌ５
−Ａ−１３２２に定める防災２級を満足することが出来
る。この場合、ラテックス中のＰＶＤＣ系難燃剤の含浸
時の適正な固型分濃度は３０〜５０％である。When impregnating this PVOC flame retardant into a conductive fiber sheet obtained by wet papermaking, the amount of adhesion is 10 to 10% by weight after drying.
15g/w" is preferable, thereby J l5
-Able to satisfy level 2 disaster prevention stipulated in A-1322. In this case, the appropriate solid content concentration during impregnation of the PVDC flame retardant in the latex is 30 to 50%.
即ち、該ラテックス中の難燃剤の固型分濃度を３０％以
下の低濃度にして含浸処理を行うと、湿式抄造で得た導
電性繊維シート中に含まれるセルロース繊維が、含浸時
の水分により膨らむため、導電性繊維間の接触が疎にな
り、導電性繊維シートの導電性が低下し、したがって、
電磁波シールド特性が低下すると云う問題がある。That is, if the impregnation treatment is carried out with the solid concentration of the flame retardant in the latex as low as 30% or less, the cellulose fibers contained in the conductive fiber sheet obtained by wet papermaking will be damaged by the water during impregnation. Due to the swelling, the contact between the conductive fibers becomes loose and the conductivity of the conductive fiber sheet decreases, thus,
There is a problem that the electromagnetic wave shielding characteristics deteriorate.
また、咳うテ・ノクスを５０％以上の高濃度にして含浸
を行うと、ラテックスの付着量調整を行うために塗エヘ
ンド部にあるニップロールのプレス圧調整が難しくなる
と云う問題を生ずる。Furthermore, if impregnation is carried out at a high concentration of 50% or more, a problem arises in that it becomes difficult to adjust the press pressure of the nip roll in the coating end section in order to adjust the amount of latex deposited.
本発明は上記の工程を経て、電磁波シールド効果および
難燃性を有する建築用内装材に使用可能な電磁波シール
ド用シートを提供し得るものである。The present invention can provide an electromagnetic shielding sheet that can be used as a building interior material and has an electromagnetic shielding effect and flame retardancy through the above steps.
本発明における電磁波シールド効果の測定は第１図に示
すアトパンテスト社のＴＲ１７３０１を用いて行う事が
出来る。図において、１０はシールドボックス、ＩＩは
試料、１２は送信アンテナ、１３は受信アンテナ、１４
はスペクトラムアナライザーである。電界波および磁界
波シールド効果の比較は、付属のロンドアンテナおよび
ループアンテナを使って行った。The electromagnetic shielding effect in the present invention can be measured using TR17301 manufactured by Atopan Test Co., Ltd. shown in FIG. In the figure, 10 is a shield box, II is a sample, 12 is a transmitting antenna, 13 is a receiving antenna, 14
is a spectrum analyzer. Comparisons of electric field wave and magnetic field wave shielding effects were made using the attached Rondo antenna and loop antenna.
また難燃性評価の方法は、ＪＩＳ−Ａ−１３２２に基づ
き、炭化長、残しん、残炎についての測定を行った。Moreover, the flame retardancy evaluation method was based on JIS-A-1322, and measurements of char length, residue, and afterflame were performed.
〈実施例〉
以下に、本発明を実施例および比較例をもって説明する
。<Examples> The present invention will be described below with reference to Examples and Comparative Examples.
実施例１
ステンレス繊維（東京製鋼社製、商品名サスミック繊維
８μｍｘ６ｍｓ）５０重置％と、４０°ＳＲに叩解され
たセルロース繊維（ＮＢＫＰ／ＬＢＫＰ＝ １ ／ １
）５０重量％とを離解混合し、ポリアミド・エピクロ
ルヒドリン樹脂からなる湿潤紙力増強剤（昭和高分子社
、商品名ポリフィックス３０１）を対バルブ１重量％添
加し、さらに、ポリアクリルアミド・アクリル酸共重合
体からなる合成粘剤（ダイヤフロック社、商品名アクリ
バーズ）を添加して坪量７０ｇ／ｍ”となるよう円網式
抄紙機で湿式抄造し導電性シートを作成した。Example 1 50% of stainless steel fiber (manufactured by Tokyo Steel Corporation, trade name: Susmic fiber 8 μm x 6 ms) and cellulose fiber beaten to 40° SR (NBKP/LBKP = 1/1)
) and 50% by weight of polyamide/epichlorohydrin resin, and 1% by weight of a wet paper strength agent (Showa Kobunshi Co., Ltd., trade name: Polyfix 301) based on the valve was added. A conductive sheet was prepared by adding a synthetic sticky agent made of a polymer (Diafloc Co., Ltd., trade name: ACRIVERZ) and wet-forming the sheet to a basis weight of 70 g/m'' using a cylinder paper machine.
この導電性シートに対し固型分濃度で４０％液に調整し
たＰＶＤＣ系難燃剤（ＩＣＩ ＪＡＰＡＮ社製、商品名
ハロフレックス２０２）を乾燥後の塗布量が１５ｇ／ｍ
”となるよう含浸処理を行い、本発明による電磁波シー
ルド用シートを作製した。得られた電磁波シールド用シ
ートについてのｔ磁波シールド特性を第２図に、難燃性
を第１表に、高湿下（温度４０℃、相対湿度９０％、以
下同じ）における電磁波シールド特性の経時変化を第５
図に示す。第２図かられかるように、５００ＭＨｚにお
けるシールド効果は、難燃剤含浸前に電界３６ｄＢ、磁
界３３ｄＢであったのに対し、含浸後は電界４３ｄＢ、
Ｍｉ界３７ｄＢにそれぞれ向上している。また、第５図
からも耐水性を伴う電磁波シールド特性の長期安定性が
示された。その結果、本発明による電磁波シールド用シ
ートは、十分なシールド特性と、難燃性および耐水性を
有することが確認された。A PVDC flame retardant (manufactured by ICI JAPAN, trade name: Haloflex 202) adjusted to a liquid concentration of 40% solids was applied to this conductive sheet in an amount of 15 g/m after drying.
An electromagnetic shielding sheet according to the present invention was prepared by impregnating it so that The change over time in the electromagnetic shielding characteristics under the conditions of
As shown in the figure. As can be seen from Figure 2, the shielding effect at 500MHz was 36 dB electric field and 33 dB magnetic field before impregnation with flame retardant, but after impregnation, the shielding effect was 43 dB electric field and 33 dB magnetic field.
The Mi field has improved to 37 dB. Furthermore, FIG. 5 also shows the long-term stability of the electromagnetic shielding characteristics accompanied by water resistance. As a result, it was confirmed that the electromagnetic shielding sheet according to the present invention had sufficient shielding properties, flame retardancy, and water resistance.
以下余白
第１表
実施例２
ステンレス繊維（東京製鋼社製、商品名サスミック繊維
８μ樗Ｘ６ａｕ＋）５０重量％と４０°ＳＲに叩解され
たセルロース繊維（ＮＢＫＰ／ＬＢＫＰ＝ １ ／ １
）５０重景％とを離解混合し、ポリアミド・エピクロ
ルヒドリン樹脂からなる湿潤紙力増強剤（昭和高分子社
製、商品名ポリフィックス３０１）を対パルプ１重量％
添加し、更にポリアクリルアミド・アクリル酸共重合体
からなる合成粘剤（ダイヤフロック社製、商品名アクリ
バーズ）を添加して、坪量７０ｇ／ｍ２となるよう円網
式抄紙機により湿式抄造し導電性シートを得た。この導
電性シートに固型分濃度４０％のｐｖｏｃ系難燃剤（東
亜合成化学工業社製、商品名アロンＤＸ−３０５）を乾
燥後のＰＶＤＣ塗布量が１５ｇ／ｍ”となるよう含浸処
理を行い、本発明による電磁波シールド用シートを作製
した。Table 1 Example 2 50% by weight of stainless steel fiber (manufactured by Tokyo Steel Corporation, trade name: Susmic Fiber 8μ Hiromi X6au+) and cellulose fiber beaten to 40°SR (NBKP/LBKP=1/1)
) 50% by weight of the pulp, and 1% by weight of the pulp with a wet paper strength enhancer (manufactured by Showa Kobunshi Co., Ltd., trade name Polyfix 301) made of polyamide epichlorohydrin resin.
A synthetic sticky agent made of polyacrylamide/acrylic acid copolymer (manufactured by Diafloc Co., Ltd., trade name: ACRIVERZ) was added, and wet paper was made using a circular mesh paper machine to give a basis weight of 70 g/m2. I got a sex sheet. This conductive sheet was impregnated with a PVDC flame retardant (manufactured by Toagosei Kagaku Kogyo Co., Ltd., trade name Aron DX-305) with a solid content concentration of 40% so that the amount of PVDC applied after drying was 15 g/m. An electromagnetic shielding sheet according to the present invention was produced.
得られた本発明による電磁波シールド用シートについて
の電磁波シールド特性を第３図に、難燃性を第１表に、
高温下における電磁波シールド特性の経時変化を第５図
に示した。その結果、本発明の電磁波シールド用シート
は十分なシールド特性および難燃性と耐水性を有するこ
とが確認された。The electromagnetic shielding properties of the obtained electromagnetic shielding sheet according to the present invention are shown in Figure 3, and the flame retardance is shown in Table 1.
Figure 5 shows the change in electromagnetic shielding characteristics over time at high temperatures. As a result, it was confirmed that the electromagnetic shielding sheet of the present invention had sufficient shielding properties, flame retardancy, and water resistance.
比較例
ステンレス繊維（東京製鋼社製、商品名サスミック繊維
８ｕｓ Ｘ６＋ｍ）５０重量％と４０”ＳＲに叩解され
たセルロース繊維（ＮＢＫＰ／ＬＢＫＰ＝ １ ／ １
）５０重量％とを離解混合し、ポリアミド・エピクロ
ルヒドリン樹脂からなる湿潤紙力増強剤（昭和高分子社
製、商品名ポリフィックス３０１）を対バルブ１重量％
添加し、更にポリアクリルアミド・アクリル酸共重合体
からなる合成粘剤（ダイヤフロック社、商品名アクリバ
ーズ）を添加して、坪量が１０ｇ／ｍ”となるよう円網
式抄紙機で湿式抄造し導電性シートを得た。この導電性
シートに対し、グアニジン系難燃剤（入用化学工業社製
、商品名ＳＧ）調合液を乾燥後のグアニジン系難燃剤の
塗布量が１５ｇ／ｓ＋２となるようサイズプレスにて塗
工して比較用の電磁波シールド用シートを得た。Comparative Example: 50% by weight of stainless steel fiber (manufactured by Tokyo Steel Corporation, trade name: Susmic Fiber 8us
) 50% by weight, and 1% by weight of a wet paper strength agent made of polyamide/epichlorohydrin resin (manufactured by Showa Kobunshi Co., Ltd., trade name Polyfix 301) based on the weight of the valve.
Then, a synthetic sticky agent made of polyacrylamide/acrylic acid copolymer (Diafloc Co., Ltd., trade name: Acrybers) was added, and wet papermaking was carried out using a cylinder paper machine so that the basis weight was 10 g/m''. A conductive sheet was obtained.A guanidine-based flame retardant (manufactured by Iyu Kagaku Kogyo Co., Ltd., trade name SG) preparation was applied to this conductive sheet so that the coating amount of the guanidine-based flame retardant after drying was 15 g/s + 2. An electromagnetic shielding sheet for comparison was obtained by coating with a size press.
この電磁波シールド用シートの電磁波シールド特性を測
定したところ、第４図に示すように５００Ｍ１ｌｚでの
シールド効果が難燃剤含浸前に電界３８ｄＢ、磁界３３
ｄＢであったのに対し、含浸後には電界３６ｄＢ、磁界
２８ｄＢへ低下した。また高湿下における電磁波シール
ド特性の長期安定性も第５図に示すように低下が大であ
った。When we measured the electromagnetic shielding properties of this electromagnetic shielding sheet, we found that the shielding effect at 500 M1lz was 38 dB for electric field and 33 dB for magnetic field before impregnation with flame retardant, as shown in Figure 4.
dB, but after impregnation, the electric field decreased to 36 dB and the magnetic field decreased to 28 dB. Furthermore, the long-term stability of the electromagnetic shielding properties under high humidity conditions was also significantly reduced as shown in FIG.
尚、実施例および比較例を通して第２． ３． ４゜５
図における縦軸はシールド効果（単位ｄＢ）を表わして
おり、該シールド効果は下式により定義するものとする
。In addition, throughout the Examples and Comparative Examples, the second. 3. 4゜5
The vertical axis in the figure represents the shielding effect (unit: dB), and the shielding effect is defined by the following formula.
したがって数値が高い程、優れたシールド効果がある事
を示すものである。Therefore, the higher the value, the better the shielding effect.
〈発明の効果〉
本発明は通常の円網式もしくは長網式等の抄紙機を使っ
た湿式抄造によって、容易に製造でき、しかも電磁波シ
ールド特性において初期特性に限らず、耐水性、高湿下
における長期安定性に優れた、更に難燃性をも有する廉
価な電磁波シールド用シートを提供でき、また、適度な
柔軟性および加工性を有するので大面積を連続一体止し
て導電処理することが要求される内装材としても有用で
ある。<Effects of the Invention> The present invention can be easily manufactured by wet papermaking using a normal cylinder-type or Fourdrinier-type paper machine, and has excellent electromagnetic shielding properties not only in the initial properties but also in water resistance and under high humidity conditions. We can provide an inexpensive electromagnetic shielding sheet with excellent long-term stability and flame retardancy, and also have appropriate flexibility and processability, so it is possible to continuously bond large areas and perform conductive treatment. It is also useful as a required interior material.
第１図は電磁波シールド特性の測定装置の略図、第２〜
５図は電界および磁界シールド効果を示す図である。
１０・・・シールドボックス、Ｉｆ・・・試料、Ｉ２・
・・送信アンテナ、１３・・・受信アンテナ、１４・・
・スペク
トラムアナライザーFigure 1 is a schematic diagram of the electromagnetic shielding characteristic measuring device, Figure 2-
FIG. 5 is a diagram showing the electric field and magnetic field shielding effects. 10... Shield box, If... Sample, I2.
...Transmitting antenna, 13...Receiving antenna, 14...
・Spectrum analyzer
Claims (1)
た原料を湿式抄造法により抄造して導電性シートを作成
し、然るのち該導電性シートに対し、ポリ塩化ビニリデ
ン系難燃剤を含浸処理することを特徴とする電磁波シー
ルド用シートの製造方法。(1) A conductive sheet is created by forming a raw material containing 30 to 95% by weight of conductive fibers into the total fiber using a wet papermaking method, and then a polyvinylidene chloride flame retardant is added to the conductive sheet. A method for manufacturing an electromagnetic shielding sheet, characterized by impregnating it with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32949589A JPH0638560B2 (en) | 1989-12-21 | 1989-12-21 | Method for manufacturing electromagnetic wave shielding sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32949589A JPH0638560B2 (en) | 1989-12-21 | 1989-12-21 | Method for manufacturing electromagnetic wave shielding sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03191598A true JPH03191598A (en) | 1991-08-21 |
| JPH0638560B2 JPH0638560B2 (en) | 1994-05-18 |
Family
ID=18222008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32949589A Expired - Lifetime JPH0638560B2 (en) | 1989-12-21 | 1989-12-21 | Method for manufacturing electromagnetic wave shielding sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638560B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000101289A (en) * | 1998-09-18 | 2000-04-07 | Tomoegawa Paper Co Ltd | Method for treating electromagnetic wave shield material in flexible printed wiring board |
| US6228509B1 (en) * | 1998-01-30 | 2001-05-08 | Tomoegawa Paper Co., Ltd | Electromagnetic wave shielding sheet |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9006557B2 (en) | 2011-06-06 | 2015-04-14 | Gentherm Incorporated | Systems and methods for reducing current and increasing voltage in thermoelectric systems |
-
1989
- 1989-12-21 JP JP32949589A patent/JPH0638560B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6228509B1 (en) * | 1998-01-30 | 2001-05-08 | Tomoegawa Paper Co., Ltd | Electromagnetic wave shielding sheet |
| JP2000101289A (en) * | 1998-09-18 | 2000-04-07 | Tomoegawa Paper Co Ltd | Method for treating electromagnetic wave shield material in flexible printed wiring board |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0638560B2 (en) | 1994-05-18 |
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