JPH10310655A - Electromagnetic wave-shielding material - Google Patents

Electromagnetic wave-shielding material

Info

Publication number
JPH10310655A
JPH10310655A JP13598097A JP13598097A JPH10310655A JP H10310655 A JPH10310655 A JP H10310655A JP 13598097 A JP13598097 A JP 13598097A JP 13598097 A JP13598097 A JP 13598097A JP H10310655 A JPH10310655 A JP H10310655A
Authority
JP
Japan
Prior art keywords
electromagnetic wave
shielding material
wave shielding
metal
weight
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.)
Pending
Application number
JP13598097A
Other languages
Japanese (ja)
Inventor
Tsuyoshi Tomosada
強 友定
Hideo Nishiguchi
西口  英夫
Hideyuki Nishida
秀行 西田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Chemical Industries Ltd
Original Assignee
Sanyo Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Chemical Industries Ltd filed Critical Sanyo Chemical Industries Ltd
Priority to JP13598097A priority Critical patent/JPH10310655A/en
Publication of JPH10310655A publication Critical patent/JPH10310655A/en
Pending legal-status Critical Current

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  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain an electromagnetic wave-shielding material comprising a metal salt crosslinked product of an expanded (co)polymer having excellent lightweight properties and electromagnetic wave-shielding properties, high compressive strength and heat insulation properties, by using an α,β-unsaturated carboxylic acid and optionally other vinyl monomers as the constituent monomers and simultaneously performing the expansion and polymerization in the presence of a (heavy) metal salt. SOLUTION: From the viewpoint of cost, the α,β-unsaturated carboxylic acid is desirably acrylic acid or methacrylic acid. The vinyl monomer is exemplified by (meth)acrylamide, (meth)acrylic acid/alkylene oxide adduct, acrylonitrile or vinyl acetate. It is desirable that the α,β-unsaturated carboxylic acid constitutes at least 30 wt.% of the (co)polymer. The (heavy) metal carbonate used is desirably a salt of a polyvalent metal such as Ca, Mg, Ba, Zn, Al, iron or copper, and the metal salt crosslinked product of the (co)polymer constitutes at least 30 wt.% of the total weight of the shielding material.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、不燃性を有する新
規な電磁波シールド材に関する。
The present invention relates to a novel electromagnetic wave shielding material having noncombustibility.

【0002】[0002]

【従来の技術】従来、建築用断熱材としてはポリウレタ
ンフォームやフェノールフォーム等の有機系発泡体やガ
ラスウール、ロックウール等の無機系繊維などが使用さ
れている。
2. Description of the Related Art Heretofore, organic foams such as polyurethane foam and phenol foam and inorganic fibers such as glass wool and rock wool have been used as heat insulating materials for buildings.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、これら
の断熱材には電磁波シールド性がほとんど認められず、
電磁波シールド性が要求されるビルディング等では、断
熱材層の他に鉛シート等を貼り付けた電磁波シールド層
を設ける必要があった。
However, these heat insulating materials have almost no electromagnetic wave shielding properties,
In a building or the like where electromagnetic wave shielding properties are required, it is necessary to provide an electromagnetic wave shielding layer to which a lead sheet or the like is attached in addition to the heat insulating material layer.

【0004】[0004]

【課題を解決するための手段】本発明者らは、電磁波シ
ールド性が高く、成形性が良く軽量かつ耐久性が良好
な、不燃性を有する電磁波シールド材について鋭意検討
した結果、本発明に到達した。
Means for Solving the Problems The present inventors have made intensive studies on non-combustible electromagnetic wave shielding materials having high electromagnetic wave shielding properties, good moldability, light weight and good durability, and reached the present invention. did.

【0005】すなわち、本発明はα,β−不飽和カルボ
ン酸および必要により他のビニル単単量体からなる単量
体を構成単位とする、発泡された(共)重合体の金属塩
架橋物からなり、該発泡を炭酸(重)金属塩により該単
量体の少なくとも一部の重合とともに行わせてなること
を特徴とするフォームからなる電磁波シールド材であ
る。
That is, the present invention relates to a crosslinked metal salt of a foamed (co) polymer comprising a monomer unit consisting of an α, β-unsaturated carboxylic acid and, if necessary, another vinyl monomer. Wherein the foaming is carried out together with at least a part of the polymerization of the monomer by a metal carbonate (heavy) salt.

【0006】本発明の電磁波シールド材の特長は、電磁
波シールド材を構成する発泡体中で金属がカルボン酸基
と塩を形成し、系内に均一に存在することであり、この
ためポリウレタンフォーム等に金属を分散させたものよ
りも均一性が高く、高い電磁波シールド性を有する。
The advantage of the electromagnetic wave shielding material of the present invention is that the metal forms a salt with a carboxylic acid group in the foam constituting the electromagnetic wave shielding material and is uniformly present in the system. It has higher uniformity and higher electromagnetic wave shielding properties than those in which metal is dispersed.

【0007】[0007]

【発明の実施の形態】本発明において、α,β−不飽和
カルボン酸としては、アクリル酸、メタアクリル酸、イ
タコン酸、マレイン酸、フマル酸、ケイヒ酸及びこれら
の塩等が挙げられる。塩としてはアルカリ金属(例えば
ナトリウム、カリウム、ルビジウム)、アルカリ土類金
属(例えばマグネシウム、カルシウム、バリウム)、典
型金属(例えばアルミニウム、ゲルマニウム、スズ)及
び遷移金属(例えば鉄、コバルト、ニッケル、銅、亜
鉛)等が挙げられる。
BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, examples of the α, β-unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, cinnamic acid and salts thereof. Salts include alkali metals (eg, sodium, potassium, rubidium), alkaline earth metals (eg, magnesium, calcium, barium), typical metals (eg, aluminum, germanium, tin) and transition metals (eg, iron, cobalt, nickel, copper, Zinc) and the like.

【0008】これらの中で好ましいものは、コストの点
から、アクリル酸、メタアクリル酸及びそれらの塩であ
る。
Among these, acrylic acid, methacrylic acid and salts thereof are preferred from the viewpoint of cost.

【0009】α,β−不飽和カルボン酸および必要によ
り他のビニル単単量体からなる単量体を構成単位とする
(共)重合体は前記単量体の1種または2種以上または
任意に他のビニル単量体を(共)重合させたものである
が、(共)重合体の重合方法、条件は公知の方法がと
れ、例えば重合開始の方法や触媒の例は、特公昭63−
221843号公報、特公昭63−445号公報等に例
示されている。
The (co) polymer having a monomer composed of an α, β-unsaturated carboxylic acid and optionally another vinyl monomer as a constitutional unit may be one or more of the above-mentioned monomers or any one of them. The other vinyl monomer is (co) polymerized, and the polymerization method and conditions of the (co) polymer can be known methods. For example, the method of initiating polymerization and examples of catalysts are described in −
No. 2,218,43 and Japanese Patent Publication No. 63-445.

【0010】任意に使用できる他のビニル単量体として
は、公知のものが使用できるが、例えば(メタ)アクリ
ルアミド、ビニルピロリドン、ヒドロキシエチル(メ
タ)アクリレート、(メタ)アクリル酸アルキレンオキ
サイド付加物、(メタ)アクリロイルポリオキシエチレ
ンメチルエーテル、2−(メタ)アクリロイルアミノ−
2−メチルプロパンスルホン酸(塩)、ビニルスルホン
酸(塩)、スチレンスルホン酸(塩)、イタコン酸
(塩)、マレイン酸(塩)等の水溶性モノビニルモノマ
ー、スチレン、アルファメチルスチレン、メチル(メ
タ)アクリレート、アクリロニトリル、酢酸ビニル、等
の油溶性モノビニルモノマーが挙げられる。
As other vinyl monomers which can be optionally used, known ones can be used. For example, (meth) acrylamide, vinylpyrrolidone, hydroxyethyl (meth) acrylate, (meth) acrylic acid alkylene oxide adduct, (Meth) acryloylpolyoxyethylene methyl ether, 2- (meth) acryloylamino-
Water-soluble monovinyl monomers such as 2-methylpropanesulfonic acid (salt), vinylsulfonic acid (salt), styrenesulfonic acid (salt), itaconic acid (salt), and maleic acid (salt), styrene, alpha methylstyrene, methyl ( Examples thereof include oil-soluble monovinyl monomers such as (meth) acrylate, acrylonitrile, and vinyl acetate.

【0011】該(共)重合体を構成するα,β−不飽和
カルボン酸単量体の重量は、該(共)重合体の重量に基
づき通常20%以上、好ましくは30%以上である。2
0%未満の場合、電磁波シールド性能が不足する。
The weight of the α, β-unsaturated carboxylic acid monomer constituting the (co) polymer is usually at least 20%, preferably at least 30%, based on the weight of the (co) polymer. 2
If it is less than 0%, the electromagnetic wave shielding performance is insufficient.

【0012】本発明において任意に使用できる他のビニ
ル単量体の一部として、多官能ビニル単量体を使用して
もよい。多官能ビニル単量体としては、ジビニルベンゼ
ン、(ポリ)エチレングリコールのジ(メタ)アクリレ
ート、(ポリ)プロピレングリコールのジ(メタ)アク
リレート、トリメチロールプロパンのポリ(メタ)アク
リレート、グリセリンのポリ(メタ)アクリレート、ペ
ンタエリスリトールのポリ(メタ)アクリレート、ジア
リルフタレート、(ポリ)エチレングリコールのジアリ
ルエーテル等が挙げられる。これらのうち、得られる電
磁波シールド材品質の点から、ポリ(メタ)アクリレー
トが好ましい。
A polyfunctional vinyl monomer may be used as a part of another vinyl monomer which can be optionally used in the present invention. Examples of the polyfunctional vinyl monomer include divinylbenzene, di (meth) acrylate of (poly) ethylene glycol, di (meth) acrylate of (poly) propylene glycol, poly (meth) acrylate of trimethylolpropane, and poly (glycerin). Examples thereof include (meth) acrylate, poly (meth) acrylate of pentaerythritol, diallyl phthalate, and diallyl ether of (poly) ethylene glycol. Among these, poly (meth) acrylate is preferred from the viewpoint of the quality of the obtained electromagnetic wave shielding material.

【0013】多官能ビニル単量体の使用割合は、目的に
応じて任意に選べばよいが、通常、ビニル単量体全重量
に対し70重量%以下であり、得られる電磁波シールド
材品質およびコストの点から、好ましくは50重量%以
下、さらに好ましくは40重量%以下である。
The proportion of the polyfunctional vinyl monomer used may be arbitrarily selected according to the purpose, but is usually 70% by weight or less based on the total weight of the vinyl monomer. From the viewpoint, the content is preferably 50% by weight or less, more preferably 40% by weight or less.

【0014】炭酸(重)金属塩の金属としては一価金属
としてアルカリ金属(例えばナトリウム、カリウム、ル
ビジウム);多価金属としてアルカリ土類金属(例えば
マグネシウム、カルシウム、バリウム)、典型金属(例
えばアルミニウム、ゲルマニウム、スズ)及び遷移金属
(例えば鉄、コバルト、ニッケル、銅、亜鉛、銀、チタ
ン)が挙げられる。 これらのうち好ましくは多価金属
であり、さらに好ましくはカルシウム、マグネシウム、
バリウム、亜鉛、アルミニウム、鉄、銅、銀、ニッケ
ル、チタン及びコバルトからなる群より選ばれた少なく
とも1種の多価金属である。
As the metal of the metal (carbon) metal salt, an alkali metal (eg, sodium, potassium, rubidium) as a monovalent metal; an alkaline earth metal (eg, magnesium, calcium, barium) as a polyvalent metal, a typical metal (eg, aluminum) , Germanium, tin) and transition metals (eg, iron, cobalt, nickel, copper, zinc, silver, titanium). Of these, preferred are polyvalent metals, and more preferred are calcium, magnesium,
It is at least one polyvalent metal selected from the group consisting of barium, zinc, aluminum, iron, copper, silver, nickel, titanium and cobalt.

【0015】本発明の電磁波シールド材において、該
(共)重合体の金属塩架橋物の重量は、全電磁波シール
ド材重量中に通常20%以上、好ましくは30%以上存
在することが望ましい。該(共)重合体の金属塩架橋物
の重量が、全電磁波シールド材重量中の20%未満の場
合は、金属塩重量が不足して、電磁波シールド性が低下
する。
In the electromagnetic wave shielding material of the present invention, the weight of the crosslinked metal salt of the (co) polymer is usually 20% or more, preferably 30% or more, based on the total weight of the electromagnetic wave shielding material. When the weight of the crosslinked metal salt of the (co) polymer is less than 20% of the total weight of the electromagnetic wave shielding material, the weight of the metal salt is insufficient and the electromagnetic wave shielding property is reduced.

【0016】本発明の電磁波シールド材には、適宜他の
任意成分を含ませることもできる。例えば、カーボンブ
ラック、セラミックファイバー、金属ウィスカー、ガラ
ス繊維、ぼう硝、酸化チタン、PEG、染顔料、キレー
ト、油脂、油、界面活性剤、ベントナイト、セルロー
ス、デンプン、水、発泡剤などが挙げられる。これら任
意成分の量は特に限定ないが、得られる電磁波シールド
材の品質から、通常は電磁波シールド材に対して50重
量%以下であり、好ましくは20重量%以下である。
The electromagnetic wave shielding material of the present invention may contain other optional components as appropriate. For example, carbon black, ceramic fibers, metal whiskers, glass fibers, silica glass, titanium oxide, PEG, dyes and pigments, chelates, fats, oils, surfactants, bentonite, cellulose, starch, water, foaming agents and the like can be mentioned. The amount of these optional components is not particularly limited, but is usually 50% by weight or less, preferably 20% by weight or less based on the quality of the obtained electromagnetic wave shielding material.

【0017】本発明の電磁波シールド材は、任意の形状
の成型品、板、シート、フィルム、棒、筒等にすること
ができる。これらは、また、RIM等公知の発泡成型
法、トランスファー成型等公知の加工法を取り入れるこ
ともできる。また、本発明の電磁波シールド材は、例え
ば塗装等の表面加工の後処理を適宜施すこともできる。
本発明の電磁波シールド材の用途としては建築物の天井
材、壁材、床材、パソコンやファクシミリ等のOA製品
の筐体、携帯電話の筐体、電波暗室等が挙げられる。
The electromagnetic wave shielding material of the present invention can be formed into a molded product, a plate, a sheet, a film, a rod, a cylinder, or the like having an arbitrary shape. These can also adopt a known processing method such as a known foam molding method such as RIM or transfer molding. Further, the electromagnetic wave shielding material of the present invention can be appropriately subjected to post-processing such as surface treatment such as painting.
Applications of the electromagnetic wave shielding material of the present invention include ceiling materials, wall materials, floor materials of buildings, housings of OA products such as personal computers and facsimiles, housings of mobile phones, anechoic chambers, and the like.

【0018】[0018]

【実施例】以下、実施例により本発明をさらに説明する
が、本発明はこれに限定されるものではない。以下にお
いて「部」および「%」はそれぞれ重量基準である。
EXAMPLES The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples. In the following, “parts” and “%” are based on weight, respectively.

【0019】実施例および比較例に使用した原料の組
成、記号等は次のとおりである。 AAc :アクリル酸 PAAc :平均分子量約10000のポリアクリル酸50%水溶液 AAc−Ca:ジアクリル酸カルシウム AAc−Zn:ジアクリル酸亜鉛 DHA :ジペンタエリスリトールヘキサアクリレート 整泡剤 :日本ユニカー(株)製「SZ−1627」
The compositions, symbols, etc. of the raw materials used in the examples and comparative examples are as follows. AAc: acrylic acid PAAc: 50% aqueous solution of polyacrylic acid having an average molecular weight of about 10,000 AAc-Ca: calcium diacrylate AAc-Zn: zinc diacrylate DHA: dipentaerythritol hexaacrylate Foam stabilizer: "SZ" manufactured by Nippon Unicar Co., Ltd. -1627 "

【0020】実施例1〜4 表1に示す混合物Aと混合物B、アスコルビン酸、過酸
化水素水(35%)を所定の割合で混合し、これを容器
に入れた。ほぼ瞬時に重合が起こり、数分内にフォーム
を得た。得たフォームの品質を表1に示した。また得た
フォームを150mm×150mm×2mmの寸法に切
り出し、このサンプルにて電磁波シールド性と重量を測
定した。測定結果を表1に示した。
Examples 1-4 Mixture A and Mixture B shown in Table 1, ascorbic acid and aqueous hydrogen peroxide (35%) were mixed at a predetermined ratio and placed in a container. Polymerization occurred almost instantaneously and a foam was obtained within minutes. The quality of the obtained foam is shown in Table 1. Further, the obtained foam was cut out to a size of 150 mm × 150 mm × 2 mm, and the electromagnetic wave shielding property and the weight were measured with this sample. Table 1 shows the measurement results.

【0021】比較例1 ペンタエリスリトールにプロピレンオキシドを付加した
平均分子量560のポリエーテルポリオール100重量
部、整泡剤「SZ−1627」2.0重量部、テトラメ
チルヘキサメチレンジアミン2.0重量部、水3.0重
量部、1−フルオロジクロロエタン10重量部からなる
混合物中に酸化鉄100重量部を分散させたスラリー
と、ポリメチレンポリフェニルイソシアネート(NCO
含量30.5%)100重量部とを混合し、これを容器
に入れた。数秒後に発泡と樹脂化がおこり約2分後にフ
ォームを得た。得たフォームの品質を表2に示した。ま
た得たフォームを150mm×150mm×2mmの寸
法に切り出し、このサンプルにて電磁波シールド性と重
量を測定した。測定結果を表2に示した。
Comparative Example 1 100 parts by weight of a polyether polyol having an average molecular weight of 560 obtained by adding propylene oxide to pentaerythritol, 2.0 parts by weight of a foam stabilizer "SZ-1627", 2.0 parts by weight of tetramethylhexamethylenediamine, A slurry in which 100 parts by weight of iron oxide was dispersed in a mixture consisting of 3.0 parts by weight of water and 10 parts by weight of 1-fluorodichloroethane, and polymethylene polyphenyl isocyanate (NCO
(30.5% content) and 100 parts by weight, and this was placed in a container. After several seconds, foaming and resinification occurred, and a foam was obtained after about 2 minutes. Table 2 shows the quality of the obtained foam. Further, the obtained foam was cut out to a size of 150 mm × 150 mm × 2 mm, and the electromagnetic wave shielding property and the weight were measured with this sample. Table 2 shows the measurement results.

【0022】比較例2 ペンタエリスリトールにプロピレンオキシドを付加した
平均分子量560のポリエーテルポリオール100重量
部、整泡剤「SZ−1627」2.0重量部、テトラメ
チルヘキサメチレンジアミン2.0重量部、水3.0重
量部、1−フルオロジクロロエタン10重量部からなる
混合物と、ポリメチレンポリフェニルイソシアネート
(NCO含量30.5%)100重量部とを混合し、こ
れを容器に入れた。数秒後に発泡と樹脂化がおこり約2
分後にフォームを得た。得たフォームの品質を表2に示
した。また得たフォームを150mm×150mm×2
mmの寸法に切り出し、このサンプルにて電磁波シール
ド性と重量を測定した。測定結果を表2に示した。
Comparative Example 2 100 parts by weight of a polyether polyol having an average molecular weight of 560 obtained by adding propylene oxide to pentaerythritol, 2.0 parts by weight of a foam stabilizer "SZ-1627", 2.0 parts by weight of tetramethylhexamethylenediamine, A mixture consisting of 3.0 parts by weight of water and 10 parts by weight of 1-fluorodichloroethane and 100 parts by weight of polymethylene polyphenyl isocyanate (NCO content: 30.5%) were mixed and placed in a container. Foaming and resinification occur after a few seconds, about 2
After a minute you got the form. Table 2 shows the quality of the obtained foam. In addition, the obtained foam is 150 mm x 150 mm x 2
The sample was cut into a size of mm, and the electromagnetic wave shielding property and the weight were measured with this sample. Table 2 shows the measurement results.

【0023】[0023]

【表1】 [Table 1]

【0024】[0024]

【表2】 [Table 2]

【0025】 密度 :(kg/m3):JIS K 6310に準
拠 圧縮強度:(kg/cm2):JIS A 9514に
準拠 電磁波シールド性:(dB):アドバンテスト法に準拠 サンプル重量:(g) 難燃性 : 燃焼速度 :(cm/min):JIS A 951
4に準拠 温度時間面積:(℃・分):JIS A 1321に準
拠 発煙係数 :(CA):JIS A 1321に準拠 残炎時間 :(秒):JIS A 1321に準拠
Density: (kg / m 3 ): compliant with JIS K 6310 Compressive strength: (kg / cm 2 ): compliant with JIS A 9514 Electromagnetic wave shielding: (dB): compliant with Advantest method Sample weight: (g) Flame retardancy: Burning speed: (cm / min): JIS A 951
Compliant with 4 Temperature time area: (° C / min): Compliant with JIS A 1321 Smoke emission coefficient: (CA): Compliant with JIS A 1321 Afterflame time: (seconds): Compliant with JIS A 1321

【0026】[0026]

【発明の効果】本発明で得られる電磁波シールド材は、
軽量でかつ電磁波シールド性に優れており、高い圧縮強
度を有する。また断熱性が高いために断熱材兼電磁波シ
ールド材として働く。よって一般の断熱材に鉛シートを
貼り付けて使用する必要がなく、原材料コストや施工コ
ストの低減が可能となる。さらに環境負荷の高い原料を
使用せず、燃焼時の不完全燃焼による有毒ガスや煤の発
生が小さく、過大な燃焼熱発生もない。従って本発明の
電磁波シールド材は建材として有用であり、使用後のフ
ォームは通常の焼却炉で他のゴミ等と混焼可能であり、
したがって環境への負荷が低く、例えばゴミ発電などに
極めて有利である。
The electromagnetic wave shielding material obtained by the present invention is:
It is lightweight, has excellent electromagnetic wave shielding properties, and has high compressive strength. Also, since it has high heat insulating properties, it works as a heat insulating material and an electromagnetic wave shielding material. Therefore, it is not necessary to attach a lead sheet to a general heat insulating material and use it, and it is possible to reduce raw material costs and construction costs. Furthermore, no raw materials having a high environmental load are used, the generation of toxic gas and soot due to incomplete combustion during combustion is small, and there is no excessive combustion heat generation. Therefore, the electromagnetic wave shielding material of the present invention is useful as a building material, and the used foam can be co-fired with other garbage in an ordinary incinerator,
Therefore, the load on the environment is low, which is extremely advantageous for, for example, garbage generation.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 α,β−不飽和カルボン酸および必要に
より他のビニル単量体からなる単量体を構成単位とす
る、発泡された(共)重合体の金属塩架橋物からなり、
該発泡を炭酸(重)金属塩により該単量体の少なくとも
一部の重合とともに行わせてなることを特徴とするフォ
ームからなる電磁波シールド材。
1. A foamed (co) polymer metal salt crosslinked product comprising a monomer composed of an α, β-unsaturated carboxylic acid and optionally another vinyl monomer as a constitutional unit,
An electromagnetic wave shielding material comprising a foam, wherein the foaming is carried out together with the polymerization of at least a part of the monomer with a carbonic acid (heavy) metal salt.
【請求項2】 該(共)重合体の金属塩架橋物の重量が
全重量中の30%以上となる請求項1記載の電磁波シー
ルド材。
2. The electromagnetic wave shielding material according to claim 1, wherein the weight of the crosslinked metal salt of the (co) polymer is at least 30% of the total weight.
【請求項3】 炭酸(重)金属塩の(重)金属が多価金
属である請求項1および2のいずれか記載の電磁波シー
ルド材。
3. The electromagnetic wave shielding material according to claim 1, wherein the (heavy) metal of the metal (heavy) carbonate is a polyvalent metal.
【請求項4】 多価金属がカルシウム、マグネシウム、
亜鉛、バリウム、アルミニウム、鉄、銅、銀、ニッケ
ル、チタンおよびコバルトからなる群より選ばれた少な
くとも1種の多価金属である請求項3記載の電磁波シー
ルド材。
4. The polyvalent metal is calcium, magnesium,
The electromagnetic wave shielding material according to claim 3, wherein the material is at least one kind of polyvalent metal selected from the group consisting of zinc, barium, aluminum, iron, copper, silver, nickel, titanium, and cobalt.
JP13598097A 1997-05-09 1997-05-09 Electromagnetic wave-shielding material Pending JPH10310655A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13598097A JPH10310655A (en) 1997-05-09 1997-05-09 Electromagnetic wave-shielding material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13598097A JPH10310655A (en) 1997-05-09 1997-05-09 Electromagnetic wave-shielding material

Publications (1)

Publication Number Publication Date
JPH10310655A true JPH10310655A (en) 1998-11-24

Family

ID=15164385

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13598097A Pending JPH10310655A (en) 1997-05-09 1997-05-09 Electromagnetic wave-shielding material

Country Status (1)

Country Link
JP (1) JPH10310655A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102382623A (en) * 2011-08-02 2012-03-21 山东大学 Preparation method of carbon-based composite wave-absorbing material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102382623A (en) * 2011-08-02 2012-03-21 山东大学 Preparation method of carbon-based composite wave-absorbing material

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