JP4993380B2 - 電磁波抑制体及びその製造方法 - Google Patents
電磁波抑制体及びその製造方法 Download PDFInfo
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- JP4993380B2 JP4993380B2 JP2008104752A JP2008104752A JP4993380B2 JP 4993380 B2 JP4993380 B2 JP 4993380B2 JP 2008104752 A JP2008104752 A JP 2008104752A JP 2008104752 A JP2008104752 A JP 2008104752A JP 4993380 B2 JP4993380 B2 JP 4993380B2
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Description
以下、電磁波抑制材料を防湿フィルムにより封止した電磁波抑制シートの製造方法について説明する。
上述の製造方法において、塩化ナトリウム濃度〔mol/L〕及びエチレングリコール濃度〔%〕を変えて製造した場合の16種類の電磁波抑制シート(サンプル1〜16)の凍結点を測定した。サンプル1〜16における塩化ナトリウム濃度〔mol/L〕、エチレングリコール濃度〔wt%〕及び凍結点〔℃〕の値を表1に示す。
電磁波抑制体の燃焼試験は、UL(Underwriter Laboratories Inc.)耐炎性試験規格UL94に準じて行った。垂直に支持した短冊状の試験片(125±5mm×13±0.5mm×厚さmm)の下端にバーナー炎をあてて10秒間保ち、その後バーナー炎を試験片から離し、炎が消えれば直ちにバーナー炎を更に10秒間あてたのちバーナー炎を離して判定を行った。判定は、1回目と2回目の接炎終了後の有炎燃焼持続時間、2回目の接炎終了後の有炎燃焼持続時間及び無炎燃焼持続時間の合計、5本の試験片の有炎燃焼時間の合計、並びに燃焼滴下物(ドリップ)の有無で判定した。V0判定は、1回目、2回目ともに10秒以内、V1,V2判定は、20秒以内に有炎燃焼を終えた場合とした。更に2回目の有炎燃焼持続時間と無炎燃焼時間の合計が、V0判定は30秒以内、V1,V2判定は60秒以内で消えた場合とした。更に5本の試験片の有炎燃焼時間の合計が、V0判定は50秒以内、V1,V2判定は250秒以内の場合とした。なお、燃焼落下物はV2のみに許容され、すべての試験片は燃え尽きてはいけない。
上述の製造方法において塩化ナトリウム濃度を3mol/Lとし、エチレングリコール濃度を10質量%として、短冊状の電磁波抑制シート(125±5mm×13±0.5mm×厚さ0.5mm)を得た。そして、この電磁波抑制シートの片面に全面に亘って感圧両面接着テープUT1515を貼り付け、試験片1を作製した。
短冊状の電磁波抑制シートの厚さを1.0mmとした以外は、試験片1と同様にして試験片2を作製した。
短冊状の電磁波抑制シートの厚さを2.0mmとした以外は、試験片1と同様にして試験片3を作製した。
短冊状の電磁波抑制シートの厚さを3.0mmとした以外は、試験片1と同様にして試験片4を作製した。
エチレングリコール濃度を20質量%とした以外は、試験片1と同様にして試験片5を作製した。
エチレングリコール濃度を20質量%とし、短冊状の電磁波抑制シートの厚さを1.0mmとした以外は、試験片1と同様にして試験片6を作製した。
エチレングリコール濃度を20質量%とし、短冊状の電磁波抑制シートの厚さを2.0mmとした以外は、試験片1と同様にして試験片7を作製した。
エチレングリコール濃度を20質量%とし、短冊状の電磁波抑制シートの厚さを3.0mmとした以外は、試験片1と同様にして試験片8を作製した。
エチレングリコール濃度を20質量%とし、短冊状の電磁波抑制シートの厚さを1.0mmとし、UT1515と同じ樹脂で構成され、基材の不織布を含有しない接着剤層を設けた以外は、試験片1と同様にして試験片9を作製した。
エチレングリコール濃度を20質量%とし、短冊状の電磁波抑制シートの厚さを2.0mmとし、UT1515と同じ樹脂で構成され、基材の不織布を含有しない接着剤層を設けた以外は、試験片1と同様にして試験片10を作製した。
エチレングリコール濃度を10質量%とし、短冊状の電磁波抑制シートの厚さを3.0mmとし、UT1515と同じ樹脂で構成され、基材の不織布を含有しない接着剤層を設けた以外は、試験片1と同様にして試験片11を作製した。
Claims (12)
- 第1の防湿フィルムと、第2の防湿フィルムと、前記第1の防湿フィルムと前記第2の防湿フィルムとの間に封止されるアクリレート系高分子ゲルとからなる電磁波抑制シートを有し、
前記アクリレート系高分子ゲルが、x質量%のアルコール類を含有し、
前記電磁波抑制シートの厚さymmが、xy座標(x,y)において、a点(10,1.0)、b点(10,3.0)、及びc点(20,1.0)の3点を結んで形成される領域内にある電磁波抑制体。 - 前記アルコール類が、メタノール、エタノール、プロパノール、ブタノール、エチレングリコール、プロピレングリコール、ペンタエリスリトールのうち少なくとも1種である請求項1記載の電磁波抑制体。
- 前記アクリレート系高分子ゲルが、電解質を含有し、
前記電解質が、塩化ナトリウム、塩化カリウム、塩化カルシウム、酢酸カリウム、酢酸カルシウムのうち少なくとも1種である請求項1記載の電磁波抑制体。 - 前記電解質が、前記アクリレート系高分子ゲルの硬化前の組成物に3.0mol/L以上添加されている請求項3記載の電磁波抑制体。
- 前記第1の防湿フィルム、前記第2の防湿フィルムの少なくともどちらか一方の面に不織布を基材とする接着剤層を有する請求項1乃至4のいずれか1項記載の電磁波抑制体。
- 前記接着剤層が、ヘキサブロモベンゼン及び三酸化アンチモンを含有する請求項5記載の電磁波抑制体。
- 第1の防湿フィルムと第2の防湿フィルムとの間に、x質量%のアルコール類と、アクリレート系モノマーと、重合開始剤とを含有する組成物を注入して密閉し、
前記第1の防湿フィルムと、前記第2の防湿フィルムと、前記組成物がゲル化したアクリレート系高分子ゲルとからなる電磁波抑制シートの厚さymmを、xy座標(x,y)において、a点(10,1.0)、b点(10,3.0)、及びc点(20,1.0)の3点を結んで形成される領域内に成型する電磁波抑制体の製造方法。 - 前記アルコール類が、メタノール、エタノール、プロパノール、ブタノール、エチレングリコール、プロピレングリコール、ペンタエリスリトールのうち少なくとも1種である請求項7記載の電磁波抑制体の製造方法。
- 前記組成物が、電解質を含有し、
前記電解質が、塩化ナトリウム、塩化カリウム、塩化カルシウム、酢酸カリウム、酢酸カルシウムのうち少なくとも1種である請求項7記載の電磁波抑制体の製造方法。 - 前記電解質が、前記組成物に3.0mol/L以上添加されている請求項9記載の電磁波抑制体の製造方法。
- 前記電磁波抑制シートを成型した後、前記第1の防湿フィルム、前記第2の防湿フィルムの少なくともどちらか一方の平面に不織布を基材とする接着剤層を形成する請求項7乃至10のいずれか1項記載の電磁波抑制体の製造方法。
- 前記接着剤層が、ヘキサブロモベンゼン及び三酸化アンチモンを含有する請求項11記載の電磁波抑制体の製造方法。
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US12/597,988 US20100116543A1 (en) | 2008-04-14 | 2008-12-02 | Electromagnetic wave suppressor and method for manufacturing the same |
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