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JP4192684B2 - Easy installation electromagnetic shielding cosmetics - Google Patents
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JP4192684B2 - Easy installation electromagnetic shielding cosmetics - Google Patents

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Publication number
JP4192684B2
JP4192684B2 JP2003156263A JP2003156263A JP4192684B2 JP 4192684 B2 JP4192684 B2 JP 4192684B2 JP 2003156263 A JP2003156263 A JP 2003156263A JP 2003156263 A JP2003156263 A JP 2003156263A JP 4192684 B2 JP4192684 B2 JP 4192684B2
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Prior art keywords
electromagnetic shielding
layer
aqueous emulsion
decorative
deposited
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JP2004360196A (en
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裕 矢賀部
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Toppan Inc
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Toppan Inc
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Description

【0001】
【発明の属する技術分野】
本発明は、電磁波シールド性能を有する化粧材に関するものである。
【0002】
【従来の技術】
従来、建築物の室内の電磁波シールド工法としては、室内の壁、床、天井の前面に銅箔やアルミ箔等の導電性の金属箔を張り詰め、その上に壁紙、床敷材などの化粧材を施工する方法が知られている。また、通常の壁紙などの化粧材の裏面に、金属蒸着ポリエチレンテレフタレートフィルムと、裏打用の紙とを、予めこの順に貼り合わせた電磁波シールド化粧材も、既に知られている。
【0003】
【特許文献1】
特開平10−217397号公報
【特許文献2】
特開2000−54523号公報
【特許文献3】
実用新案登録第2567798号公報
【0004】
しかしながら、金属箔は傷つきやすく、強度的にもろいため、施工や取り扱いに細心の注意と熟練が必要である。さらに、その上に化粧材を施工する際は、施工時間が増大してしまう欠点があった。また、化粧材の裏面に金属蒸着フィルムと紙とを貼り合わせた構成の化粧材は、製造工程が多くなり高コストとなること、各基材の折り曲げ強度が異なるので折り曲げると弱い層が破断すること、及び、水性接着剤を用いて施工する際、水分による伸縮が層間で異なることから、カール等の施工しにくさ及び施工後乾くまでに日数がかかるなどの問題があった。
【0005】
上記の問題に鑑み、本発明者らは既に、片面に金属蒸着を施してある紙基材層に対して、蒸着面側に水性エマルジョン樹脂を主成分とする水性エマルジョン組成物により形成された化粧樹脂層を積層してなる易施工電磁波シールド化粧材を開発し、特願2003−116560号として特許出願した。
【0006】
上記の易施工電磁波シールド化粧材は、紙面の金属蒸着層が電磁波シールド性能を発現することは勿論のこと、単純な構成なので製造が容易であり、金属箔を使用しないので取り扱いが容易であり、金属箔や金属蒸着フィルムの様に曲げ強度が紙と大きく相違する材料層を含まないので、層間の曲げ強度の差により折り曲げると破断するといった問題もない。
【0007】
しかも、金属蒸着層は紙面への蒸着であるから微細な孔部を多数有したものとなり、適度の透湿性を有しているから、紙基材層の裏面に塗工した水性接着剤の水分が金属蒸着層を透過して化粧樹脂層側へ抜けることができ、従って、金属箔やプラスチックフィルムを用いた化粧材と比較すれば、施工時の水分によるカールが抑えられると共に、壁面等への施工後の接着剤の乾燥が促進され、目開きやしわ等の問題も低減することができるという、優れた施工性を備えたものである。
【0008】
しかし、金属蒸着層の透湿性は、上記の様に金属箔や金属蒸着フィルムと比較すれば格段に高いとは言っても、金属蒸着層を含まない、紙基材層の上に単に化粧樹脂層を設けたのみの構成の通常の化粧材と比較すれば、遥かに劣ることは否めない。従って、水性接着剤による施工時のカールのしにくさや、施工後の乾燥の速さは、金属箔や金属蒸着フィルムを用いた化粧材よりは遥かに改善され、実用可能な水準に達したとは言うものの、金属蒸着層を含まない通常の化粧材と比較すれば、十分満足すべき水準にあるとは言い難いものであった。
【0009】
【発明が解決しようとする課題】
本発明は、従来の技術の上記問題を解決し、金属箔や金属蒸着フィルムを使用しないので、取り扱いが容易であり、積層された異種の材料の間での曲げ強度の相違や水分による伸縮の相違などによる施工性不良の問題も改善されており、さらに、施工後乾燥するまでの時間も大幅に短縮された易施工電磁波シールド化粧材を提供しようとするものである。
【0010】
【課題を解決するための手段】
本発明の易施工電磁波シールド化粧材は、片面に金属蒸着を施してある紙基材層に対して、蒸着面側に水性エマルジョン樹脂を主成分とする水性エマルジョン組成物により形成された化粧樹脂層を積層してなる易施工電磁波シールド化粧材において、前記水性エマルジョン組成物が水分吸放湿剤を含有することを特徴とするものであり、特に、前記水分吸放湿剤の平均粒径が、湿度25%RHにおいて0.1〜10μmであり、水を吸収して膨潤した状態での粒径拡大率が5倍以下であることを特徴とするものである。
【0011】
【発明の実施の形態】
以下、本発明について、詳細に説明する。
【0012】
本発明で用いられる紙基材層としては、通常のアート紙、コート紙、無機紙、難燃紙等を用いることができる。
【0013】
紙基材層に蒸着する金属としては、少なくとも20dB以上の電磁波シールド性能をもたらす材料であれば特に限定されず、例えば、アルミニウム、銅、ニッケル等を用いることができる。
【0014】
また、蒸着層の厚みとしては、電磁波シールド性能が、絶対値(電磁波シールド性能は通常マイナス値で表示され、絶対値が大きいほど性能がよい)で20dB以上となる厚みであれば良く、0.03μm〜500μmである。0.03μm未満では、十分な電磁波シールド性能が得られない場合があり、500μmを超えると、施工する際に、しわ等の原因になるためである。
【0015】
本発明で化粧樹脂層の形成に用いる水性エマルジョン組成物は、水性エマルジョン樹脂を主成分とし、水分吸放湿剤を含有するものであり、さらに必要に応じて充填材、発泡剤、その他の添加剤を適宜添加したものである。本発明の易施工電磁波シールド化粧材の代表例である壁紙の場合、電磁波シールド性能を有しない通常の壁紙の場合と同様に、充填材及び発泡剤が少なくとも添加される場合が多い。
【0016】
本発明で使用する水性エマルジョン樹脂としては特に限定されないが、例えばアクリル酸エステル、芳香族ビニル化合物等の重合体や、スチレン−ブタジエンゴム系、酢酸ビニル系、エチレン−酢酸ビニル共重合体、シリコーン、ポリウレタン、ポリブテン等の少なくとも1種または2種以上からなり、構造上は特に限定しないが、通常の共重合体もしくはコア/シェルの2層構造、ブレンド等を用いることができる。
【0017】
本発明で使用する水分吸放湿剤としては、水酸基やカルボキシル基等の親水性の官能基を多く含む比較的疎な構造の物質であって、自身の体積を超える多量の水分を内部に吸収貯蔵可能な物質であれば良く、具体的には公知の一般的な高吸水性ポリマー等が用いられ、例えば、デンプン−アクリル酸グラフト重合体、デンプン−アクリロニトリルグラフト重合体、セルロース−アクリロニトリルグラフと重合体、ポリビニルアルコール架橋重合体、ポリアクリル酸ナトリウム架橋体、アクリル酸メチル−酢酸ビニル共重合体ケン化物等が用いられる。また、馬鈴薯デンプンやデキストリン類等の天然物を用いることも可能である。さらに、水分を吸着保持可能な、大きな比表面積を有する多孔質の親水性無機物質の粒子も使用可能であり、例えば、シリカゲル、ゼオライト、珪藻土、焼成タルク等からなる粉体等を好適に使用することができる。これらの水分吸放湿剤は単独、もしくは2種以上混合して使用することができる。
【0018】
また、水分吸放湿剤の平均粒径としては、湿度25%RHにおいて0.1〜10μmであり、水を吸収して膨潤した状態での粒径拡大率としては、5倍以下であることが好ましい。平均粒径が0.1μm以下であると、粒子が細かいために水性エマルジョン組成物が増粘してしまい、塗工適性が低下する。一方、平均粒径が10μmを超えたり、膨潤状態での粒径拡大率が5倍を超えるものであると、乾燥時と湿潤時とでの水分吸放湿剤の体積差が大きいために、化粧樹脂層の表面の意匠が崩れてしまうためである。
【0019】
本発明の易施工電磁波シールド化粧材は、化粧樹脂層を形成する水性エマルジョン組成物に、水分吸放湿剤を配合したことにより、施工時に紙基材層の裏面に塗布した水性接着剤から紙基材層内に浸透した水分が、化粧樹脂層内の水分吸放湿剤に吸引され、紙基材層と化粧樹脂層との界面に存在する金属蒸着層を水分が透過するのが促進される結果、水性接着剤を塗工した状態においては、水分吸放湿剤を配合しない場合よりも多くの水分が化粧樹脂層内に移行する結果、紙基材層と化粧樹脂層との含水率差によるカールが緩和され、また、この化粧材を施工面に貼付した後には、水性接着剤の水分が金属蒸着層及び化粧樹脂層を透過して外気中へ揮散するのが促進される結果、施工後の乾燥時間が短縮される。
【0020】
本発明で使用する充填剤としては、水酸化アルミニウム、水酸化マグネシウム、水酸化バリウム、炭酸カルシウム、炭酸マグネシウム、硫酸カルシウム、硫酸バリウム、珪砂、クレー、シリカ類、珪酸マグネシウムなどを挙げることができる。好ましくは水酸化アルミニウム、水酸化マグネシウム、炭酸カルシウムなどである。充填剤の添加量としては、水性エマルジョン樹脂100重量部当たり50〜300重量部が好ましい。50重量部未満の場合は難燃効果が十分に現れず、300重量部を超えると化粧材の表面強度が弱くなる。
【0021】
本発明で使用する発泡剤は、好ましくはマイクロカプセル発泡剤を用いる。これは、ポリアクリロニトリル、アクリロニトリル−アクリル酸メチル共重合体、メタクリル酸メチル−アクリロニトリル共重合体などからなる中空の殻部分の内部に、エタン、プロパン、ブタン、イソブタン、ペンタン、ヘキサン、ヘプタンなどの低沸点炭化水素を内包したもので、粒径は2〜30μm程度の球体である。発泡剤の添加量は3〜20重量部が好ましい。3重量部未満では発泡層のボリューム感が不足し、20重量部を超えると発泡層の表面強度が弱くなる。
【0022】
発泡剤の発泡開始温度は120℃〜180℃であることが好ましい。180℃を超えるものは発泡性に劣り、熱エネルギーコストも高くなる。一方、発泡開始温度が120℃未満の場合は、水性エマルジョン組成物の水分を乾燥させる為の乾燥温度下でも発泡が起き易くなり、良好な発泡層が得られない。
【0023】
本発明で用いられる水性エマルジョン組成物には、例えば、着色剤、分散剤、ブロッキング防止剤、消泡剤、増粘剤などの添加剤を添加しても良い。
【0024】
上記の水性エマルジョン組成物を、前述した紙基材層の金属蒸着面に塗工し、加熱発泡して化粧樹脂層を形成して得られるのが、本発明の易施工電磁波シールド化粧材である。
【0025】
水性エマルジョン組成物の塗工方法としては、例えば、ナイフコーター、ノズルコーター、グラビアコーター、ロータリースクリーンコーター、リバースロールコーター等の塗工方法が挙げられる。
【0026】
さらに、水性エマルジョン組成物層の表面に、水性エマルジョン樹脂を主成分とした発泡性インキ及び/又は非発泡性インキ等により、グラビア印刷法、オフセット印刷法、スクリーン印刷法等にて絵柄模様を印刷しても良い。
【0027】
以上、本発明の易施工電磁波シールド化粧材の代表的な実施の形態について説明したが、本発明はこれに限定されるものではなく、その本旨を変更しない範囲において種々変形して実施することができる。
【0028】
【実施例】
以下に実施例を示して本発明をさらに詳細に説明するが、本発明はこれによって限定されるものではない。
【0029】
実施例1
坪量100g/m2の難燃紙の表面に、アルミニウムを厚さ1μmに蒸着し、その蒸着面に、下記の表1に示す組成の水性エマルジョン組成物(水分吸放湿剤を含む)を、乾燥後の塗布量が約100g/m2になるようにバーコーターにて塗工し、オーブンにて120℃、2分間乾燥して、ベース層を得た。次に、ベース層上に水性インキを用いてグラビア印刷にて絵柄模様を形成したのち、210℃、30秒間、エンボス加工を実施し、本発明の易施工電磁波シールド化粧材を得た。
【0030】
得られた易施工電磁波シールド化粧材について、ASTM ES7−83に規定された近接電界測定及びアドバンテスト社のTR17301を使用した近接電界測定において、電磁波周波数範囲0〜1000MHzにて測定した結果、全ての周波数について電磁波シールド性能(絶対値)は20dB以上の値であった。
【0031】
また、この易施工電磁波シールド化粧材の裏面に、壁紙施工用のデンプン糊を150g/m2(wet)塗布し、石膏ボードからなる壁下地の表面に施工して、乾燥時間すなわち接着時間(施工後、化粧材を剥がすと裏打紙である難燃紙が紙間剥離する様になるまでの時間)を評価した。この評価は温度23±3℃、湿度65±5%RHの環境下にて行った。結果は下記の表2に示す。
【0032】
比較例1
上記実施例1の水性エマルジョン組成物の組成を表1に示すように変更し(水分吸放湿剤を配合せず)、その他は上記実施例1と同じ条件で易施工電磁波シールド化粧材を得た。
【0033】
得られたものについて上記実施例1と同じ条件で電磁波シールド性能を測定したところ、全ての周波数について20dB未満の値であった。また、上記実施例1と同じ条件で乾燥時間の評価を行った。結果は下記の表2に示す。
【0034】
【表1】

Figure 0004192684
【0035】
【表2】
Figure 0004192684
【0036】
【発明の効果】
本発明により、片面に金属蒸着を施してある紙基材層に対して、蒸着面側に水性エマルジョン樹脂を主成分とし、水分吸放湿剤を含有した水性エマルジョン組成物により形成した化粧樹脂層を積層したことにより、容易に施工でき、20dB以上の電磁波シールド性能を有し、しかも乾燥時間を短縮できる施工性に優れた易施工電磁波シールド化粧材を得ることができた。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a decorative material having electromagnetic wave shielding performance.
[0002]
[Prior art]
Conventionally, as an electromagnetic wave shielding method for indoors in buildings, conductive metal foil such as copper foil and aluminum foil is stretched on the front of indoor walls, floors, and ceilings, and wallpaper, floor coverings, etc. are applied thereon. Methods for constructing materials are known. Further, an electromagnetic wave shielding decorative material in which a metal-deposited polyethylene terephthalate film and a backing paper are previously bonded in this order to the back surface of a decorative material such as ordinary wallpaper is already known.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-217397 [Patent Document 2]
JP 2000-54523 A [Patent Document 3]
Utility Model Registration No. 2567798 Publication [0004]
However, since metal foil is easily damaged and fragile in strength, it requires careful attention and skill in construction and handling. Furthermore, when applying a decorative material on it, there existed a fault which construction time will increase. In addition, a decorative material having a structure in which a metal vapor-deposited film and paper are bonded to the back surface of the decorative material results in an increased manufacturing process and high cost, and the bending strength of each base material is different, so that the weak layer breaks when bent. In addition, when construction is performed using a water-based adhesive, there are problems such as difficulty in construction of curls and the like, and it takes days to dry after construction because expansion and contraction due to moisture differs between layers.
[0005]
In view of the above problems, the present inventors have already made a makeup formed of an aqueous emulsion composition mainly composed of an aqueous emulsion resin on the vapor deposition surface side of a paper base material layer that has been subjected to metal vapor deposition on one side. An easy-to-construct electromagnetic shielding material made by laminating resin layers was developed, and a patent application was filed as Japanese Patent Application No. 2003-116560.
[0006]
The above easy-to-construct electromagnetic shielding material is easy to manufacture because it has a simple structure, as well as the metal deposition layer on the paper to express electromagnetic shielding performance, and is easy to handle because it does not use metal foil. Since there is no material layer having a bending strength significantly different from that of paper, such as a metal foil or a metal vapor-deposited film, there is no problem of breaking when bent due to a difference in bending strength between layers.
[0007]
Moreover, since the metal vapor deposition layer is vapor deposition on the paper surface, it has many fine pores and has appropriate moisture permeability, so the water content of the water-based adhesive applied to the back surface of the paper base material layer. Can pass through the metal vapor-deposited layer and escape to the decorative resin layer side, and therefore curl due to moisture at the time of construction can be suppressed, and compared to the decorative material using metal foil or plastic film. It has excellent workability such that drying of the adhesive after construction is promoted, and problems such as openings and wrinkles can be reduced.
[0008]
However, although the moisture permeability of the metal vapor deposition layer is much higher than the metal foil or metal vapor deposition film as described above, it does not include the metal vapor deposition layer and is simply a decorative resin on the paper base layer. It cannot be denied that it is far inferior when compared with a normal cosmetic material having a structure in which only a layer is provided. Therefore, the curling resistance during construction with water-based adhesives and the speed of drying after construction are far improved compared to cosmetic materials using metal foil or metal-deposited film, and have reached a practical level. That said, it was hard to say that it was at a sufficiently satisfactory level as compared with ordinary cosmetics that did not include a metal vapor deposition layer.
[0009]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems of the prior art and does not use a metal foil or a metal vapor deposited film, so that it is easy to handle, and the difference in bending strength between the dissimilar laminated materials and the expansion and contraction due to moisture. The problem of poor workability due to differences and the like is also improved, and further, an easy-to-install electromagnetic shielding cosmetic material in which the time until drying after construction is greatly shortened is provided.
[0010]
[Means for Solving the Problems]
The easy-to-install electromagnetic shielding decorative material of the present invention is a decorative resin layer formed of a water-based emulsion composition containing a water-based emulsion resin as a main component on the vapor-deposited surface side with respect to a paper base material layer that has been subjected to metal vapor deposition on one side. In the easy-to-construct electromagnetic shielding material having a laminated structure, the water-based emulsion composition contains a moisture absorbing / releasing agent, and in particular, the average particle diameter of the moisture absorbing / releasing agent is It is 0.1 to 10 μm at a humidity of 25% RH, and the particle size enlargement ratio in a swollen state by absorbing water is 5 times or less.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0012]
As the paper base layer used in the present invention, ordinary art paper, coated paper, inorganic paper, flame retardant paper, and the like can be used.
[0013]
The metal deposited on the paper base layer is not particularly limited as long as it is a material that provides an electromagnetic shielding performance of at least 20 dB or more, and for example, aluminum, copper, nickel, or the like can be used.
[0014]
Further, the thickness of the vapor deposition layer may be any thickness as long as the electromagnetic wave shielding performance is 20 dB or more in absolute value (the electromagnetic wave shielding performance is usually displayed as a negative value, and the larger the absolute value, the better the performance). It is 03 micrometers-500 micrometers. If the thickness is less than 0.03 μm, sufficient electromagnetic wave shielding performance may not be obtained. If the thickness exceeds 500 μm, wrinkles and the like are caused during construction.
[0015]
The aqueous emulsion composition used for forming the decorative resin layer in the present invention is mainly composed of an aqueous emulsion resin and contains a moisture absorbing / releasing agent, and further, if necessary, a filler, a foaming agent, and other additives. An agent is appropriately added. In the case of wallpaper that is a representative example of the easy-to-install electromagnetic shielding material of the present invention, at least a filler and a foaming agent are often added, as in the case of ordinary wallpaper that does not have electromagnetic shielding performance.
[0016]
Although it does not specifically limit as aqueous emulsion resin used by this invention, For example, polymers, such as an acrylate ester and an aromatic vinyl compound, styrene-butadiene rubber type | system | group, vinyl acetate type, ethylene-vinyl acetate copolymer, silicone, It is composed of at least one or two or more of polyurethane, polybutene and the like, and is not particularly limited in terms of structure, but an ordinary copolymer or a core / shell two-layer structure, a blend, or the like can be used.
[0017]
The moisture absorbing / releasing agent used in the present invention is a substance having a relatively sparse structure containing many hydrophilic functional groups such as hydroxyl groups and carboxyl groups, and absorbs a large amount of moisture exceeding its own volume. Any material can be used as long as it can be stored. Specifically, a known general superabsorbent polymer is used. For example, starch-acrylic acid graft polymer, starch-acrylonitrile graft polymer, cellulose-acrylonitrile graph and A polymer, a crosslinked polyvinyl alcohol polymer, a crosslinked sodium polyacrylate, a methyl acrylate-vinyl acetate copolymer saponified product, or the like is used. It is also possible to use natural products such as potato starch and dextrins. Furthermore, porous hydrophilic inorganic substance particles having a large specific surface area capable of adsorbing and holding moisture can also be used. For example, powder made of silica gel, zeolite, diatomaceous earth, calcined talc, or the like is preferably used. be able to. These moisture absorbing / releasing agents can be used alone or in admixture of two or more.
[0018]
In addition, the average particle size of the moisture absorbent / release agent is 0.1 to 10 μm at a humidity of 25% RH, and the particle size enlargement ratio in a swollen state by absorbing water is 5 times or less. Is preferred. When the average particle size is 0.1 μm or less, the aqueous emulsion composition is thickened due to fine particles, and the coating suitability is lowered. On the other hand, if the average particle size exceeds 10 μm or the particle size expansion rate in the swollen state exceeds 5 times, the volume difference of the moisture absorbent in the dry state and the wet state is large. This is because the design of the surface of the decorative resin layer is broken.
[0019]
The easy-to-install electromagnetic shielding decorative material of the present invention is a paper from an aqueous adhesive applied to the back surface of the paper base layer at the time of construction by blending a moisture absorbing / releasing agent in the aqueous emulsion composition forming the decorative resin layer. Moisture that has penetrated into the base material layer is sucked into the moisture absorbing / releasing agent in the decorative resin layer, which promotes the permeation of water through the metal vapor deposition layer that exists at the interface between the paper base material layer and the decorative resin layer. As a result, in the state where the water-based adhesive is applied, the moisture content of the paper base material layer and the decorative resin layer is increased as a result of a larger amount of moisture moving into the decorative resin layer than when no moisture absorbing / releasing agent is added. As a result of curling due to the difference, and after applying this cosmetic material to the construction surface, the water content of the water-based adhesive is promoted to permeate through the metal vapor-deposited layer and the decorative resin layer to evaporate into the outside air. Drying time after construction is shortened.
[0020]
Examples of the filler used in the present invention include aluminum hydroxide, magnesium hydroxide, barium hydroxide, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, silica sand, clay, silicas, and magnesium silicate. Aluminum hydroxide, magnesium hydroxide, calcium carbonate and the like are preferable. The addition amount of the filler is preferably 50 to 300 parts by weight per 100 parts by weight of the aqueous emulsion resin. When the amount is less than 50 parts by weight, the flame retardant effect does not sufficiently appear. When the amount exceeds 300 parts by weight, the surface strength of the decorative material becomes weak.
[0021]
As the foaming agent used in the present invention, a microcapsule foaming agent is preferably used. This is because the inside of the hollow shell portion made of polyacrylonitrile, acrylonitrile-methyl acrylate copolymer, methyl methacrylate-acrylonitrile copolymer, etc. is low in ethane, propane, butane, isobutane, pentane, hexane, heptane, etc. It has a boiling point hydrocarbon and is a sphere having a particle size of about 2 to 30 μm. The addition amount of the blowing agent is preferably 3 to 20 parts by weight. If it is less than 3 parts by weight, the volume feeling of the foam layer is insufficient, and if it exceeds 20 parts by weight, the surface strength of the foam layer becomes weak.
[0022]
The foaming start temperature of the foaming agent is preferably 120 ° C to 180 ° C. Those exceeding 180 ° C. are inferior in foaming property, and the heat energy cost becomes high. On the other hand, when the foaming start temperature is less than 120 ° C., foaming easily occurs even at a drying temperature for drying the water of the aqueous emulsion composition, and a good foamed layer cannot be obtained.
[0023]
You may add additives, such as a coloring agent, a dispersing agent, an antiblocking agent, an antifoamer, a thickener, to the aqueous | water-based emulsion composition used by this invention, for example.
[0024]
The easy-to-install electromagnetic shielding composition of the present invention is obtained by applying the above-mentioned aqueous emulsion composition to the metal vapor-deposited surface of the paper base layer described above and foaming by heating to form a decorative resin layer. .
[0025]
Examples of the coating method of the aqueous emulsion composition include coating methods such as a knife coater, a nozzle coater, a gravure coater, a rotary screen coater, and a reverse roll coater.
[0026]
Furthermore, a pattern is printed on the surface of the aqueous emulsion composition layer by using a gravure printing method, an offset printing method, a screen printing method, etc., with a foaming ink and / or non-foaming ink mainly composed of an aqueous emulsion resin. You may do it.
[0027]
As mentioned above, although the typical embodiment of the easy-to-install electromagnetic shielding material of the present invention has been described, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. it can.
[0028]
【Example】
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
[0029]
Example 1
Aluminum is vapor-deposited to a thickness of 1 μm on the surface of flame-retardant paper having a basis weight of 100 g / m 2 , and an aqueous emulsion composition (including a moisture absorbing / releasing agent) having the composition shown in Table 1 below is deposited on the vapor-deposited surface. The base layer was obtained by coating with a bar coater such that the coating amount after drying was about 100 g / m 2 and drying in an oven at 120 ° C. for 2 minutes. Next, after forming a pattern on the base layer by gravure printing using water-based ink, embossing was performed at 210 ° C. for 30 seconds to obtain an easy-to-install electromagnetic shielding cosmetic material of the present invention.
[0030]
As a result of measuring the electromagnetic wave frequency range of 0 to 1000 MHz in the proximity electric field measurement defined in ASTM ES7-83 and the proximity electric field measurement using Advantest TR17301, all the frequencies of the easy-to-install electromagnetic shielding material obtained were obtained. The electromagnetic shielding performance (absolute value) was about 20 dB or more.
[0031]
In addition, 150 g / m 2 (wet) of starch paste for wallpaper construction is applied to the back surface of this easy-to-construct electromagnetic shielding material, and it is applied to the surface of the wall base made of gypsum board. Thereafter, when the decorative material was peeled off, the time until the flame-retardant paper as the backing paper peeled between the papers was evaluated. This evaluation was performed in an environment of a temperature of 23 ± 3 ° C. and a humidity of 65 ± 5% RH. The results are shown in Table 2 below.
[0032]
Comparative Example 1
The composition of the aqueous emulsion composition of Example 1 was changed as shown in Table 1 (no moisture absorption / desorption agent was added), and the other was obtained an easy-to-install electromagnetic shielding material under the same conditions as in Example 1 above. It was.
[0033]
When the electromagnetic shielding performance of the obtained product was measured under the same conditions as in Example 1, the values were less than 20 dB for all frequencies. The drying time was evaluated under the same conditions as in Example 1. The results are shown in Table 2 below.
[0034]
[Table 1]
Figure 0004192684
[0035]
[Table 2]
Figure 0004192684
[0036]
【The invention's effect】
According to the present invention, a decorative resin layer formed from an aqueous emulsion composition containing a water-based moisture-absorbing / releasing agent as a main component on the vapor-deposited surface side of a paper base material layer subjected to metal vapor deposition on one side. Thus, it was possible to obtain an easy-to-install electromagnetic shield material having excellent workability that can be easily applied, has an electromagnetic shielding performance of 20 dB or more, and can shorten the drying time.

Claims (2)

片面に金属蒸着を施してある紙基材層に対して、蒸着面側に水性エマルジョン樹脂を主成分とする水性エマルジョン組成物により形成された化粧樹脂層を積層してなる易施工電磁波シールド化粧材において、前記水性エマルジョン組成物が水分吸放湿剤を含有することを特徴とする易施工電磁波シールド化粧材。Easy-to-install electromagnetic shielding material made by laminating a decorative resin layer formed of an aqueous emulsion composition mainly composed of an aqueous emulsion resin on the vapor-deposited side of a paper base material layer that has been metal-deposited on one side In Claim 5, The said water-based emulsion composition contains a moisture absorption / release agent, The easily constructed electromagnetic shielding cosmetic material characterized by the above-mentioned. 前記水分吸放湿剤の平均粒径が、湿度25%RHにおいて0.1〜10μmであり、水を吸収して膨潤した状態での粒径拡大率が5倍以下であることを特徴とする請求項1に記載の易施工電磁波シールド化粧材。The moisture absorption / release agent has an average particle size of 0.1 to 10 μm at a humidity of 25% RH, and a particle size expansion rate in a swollen state after absorbing water is 5 times or less. The easily-constructed electromagnetic wave shielding decorative material according to claim 1.
JP2003156263A 2003-06-02 2003-06-02 Easy installation electromagnetic shielding cosmetics Expired - Fee Related JP4192684B2 (en)

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