JP6096806B2 - 複合炭素素材を含む電磁シールド用樹脂組成物 - Google Patents
複合炭素素材を含む電磁シールド用樹脂組成物 Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
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- GKTNLYAAZKKMTQ-UHFFFAOYSA-N n-[bis(dimethylamino)phosphinimyl]-n-methylmethanamine Chemical compound CN(C)P(=N)(N(C)C)N(C)C GKTNLYAAZKKMTQ-UHFFFAOYSA-N 0.000 claims 1
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
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- C08L101/00—Compositions of unspecified macromolecular compounds
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- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
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- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
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Description
製造例1:酸化剤のない条件で表面改質された多層(マルチウォール)カーボンナノチューブの製造
多層(マルチウォール)カーボンナノチューブ(以下、MWCNT、平均粒径:0.01μm)21gと蒸留水979gとを循環ポンプで混合して、前処理槽でMWCNT溶液を用意した。前記MWCNT溶液は、高圧注入ポンプを介して30g/minの流速で熱交換器により150〜200℃に予熱された予熱槽に投入した。前記予熱された溶液は、200℃および230atm〜250atmの亜臨界水状態の酸化剤のない条件で表面改質反応器に注入して表面改質し、前記酸化剤のない条件で表面改質された生成物は、また熱交換器に移送して150℃に1次冷却してから冷却装置で25℃の温度に冷却した後、酸化剤のない条件で連続して表面改質された20.9gの多層カーボンナノチューブを得た。得られた多層カーボンナノチューブは、超臨界水内で凝集が解除されて分散性が向上し、低い酸素含量(0.1wt%)によりカーボンナノチューブの欠陥が少なく、固有の高い電気伝導性と電磁シールドの効果を奏することができる。
酸化剤として酸素を使用したこと以外は、前記製造例1と同様な方法で表面改質された多層カーボンナノチューブを得た、245atm〜252atmに圧縮された気相状態の酸素は、熱交換器の前段で0.8g/minの流速でMWCNT溶液と混合して、150〜200℃に予熱された予熱槽に投入した。得られた多層カーボンナノチューブは、超臨界水内で凝集が解除されて分散性は向上するものの、高い酸素含量(5.2wt%)により酸化してカーボンナノチューブに多くの欠陥が発生して、固有の高い電気伝導性と電磁シールドの性能が低下する。
MWCNTの代わりにカーボンブラックを使用したこと以外は、前記製造例1と同様な方法で酸化剤のない条件で表面改質されたカーボンブラックを得た。
回転する二軸押出機のホッパーに、ポリプロピレン855g、製造例1の酸化剤のない条件で表面改質されたカーボンナノチューブ(MWCNT)25gおよびカーボンブラック(平均粒径:0.02μm)120gを投入した。200℃の押出機の軸の回転によって高分子樹脂がバレルで溶融され、炭素素材と混練されて、押出機のダイ(die)を介して連続して排出されるようにした。押出機から排出されるポリプロピレン鎖(strand)を、ペレタイザーを用いて通常の短いペレットに製造した。
製造例1のMWCNT50g、ポリプロピレン800gおよびカーボンブラック(平均粒径:0.02μm)150gと、異なる含量を使用すること以外は、実施例1と同様に実施した。
カーボンブラックの代わりに炭素繊維(平均粒径:7μm)120gを使用すること以外は、実施例1と同様に実施した。
製造例1のMWCNT70g、ポリプロピレン680gおよびカーボンブラック(平均粒径:0.02μm)250gと、異なる含量を使用すること以外は、実施例1と同様に実施した。
カーボンブラックの代わりにアルミニウム酸化物(Al2O3、平均粒径:10μm)250gを使用し、製造例1のMWCNT70gとポリプロピレン680gと、異なる含量を使用すること以外は、実施例1と同様に実施した。
実施例1の表面処理されていないカーボンブラックの代わりに製造例3の酸化剤のない条件で表面処理されたカーボンブラックを使用すること以外は、実施例1と同様に実施した。
製造例1のMWCNTの代わりに製造例2の酸素で表面改質されたMWCNT25gを使用すること以外は、実施例1と同様に実施した。
製造例1のMWCNTの代わりに製造例2の酸素で表面改質されたMWCNT50gを使用すること以外は、実施例2と同様に実施した。
製造例1のMWCNTの代わりに製造例2の酸素で表面改質されたMWCNT25gを使用すること以外は、実施例3と同様に実施した。
製造例1のMWCNTを使用することなく、ポリプロピレン800gとカーボンブラック(平均粒径:0.02μm)200gを使用して、実施例1と同様に実施した。
製造例1のMWCNTを使用することなく、ポリプロピレン800gと炭素繊維(平均粒径:7μm)200gを使用して、実施例1と同様に実施した。
カーボンブラックを使用することなく、製造例1のMWCNT100gとポリプロピレン900gを使用して、実施例1と同様に実施した。
カーボンブラックを使用することなく、製造例1のMWCNTの代わりに製造例2の酸素で表面改質されたMWCNT100gおよびポリプロピレン900gを使用して、実施例1と同様に実施した。
製造例1のMWCNTの代わりに製造例2の酸素で表面改質されたMWCNT70gを使用すること以外は、実施例4と同様に実施した。
製造例1のMWCNTの代わりに製造例2の酸素で表面改質されたMWCNT70gを使用すること以外は、実施例5と同様に実施した。
1.表面抵抗の測定
三菱社製のLoresta GP(MCP‐T600)を使用して、JISK 7194/ASTM D991に準じて測定した。
Rhode&Schwartz社製のEMIシステムを使用して、ASTM D4935に準じて測定した。
Olsen社製の衝撃強度測定器を使用して、ASTM D256に準じて測定した。
Claims (11)
- (i)前処理槽でカーボンナノチューブ溶液を用意し、前記カーボンナノチューブ溶液を熱交換器により予熱された予熱槽に投入する段階と、
(ii)酸素、空気、オゾン、および過酸化水素水から選択される酸化剤を使用することなく、圧力50〜400atmと温度100〜600℃の亜臨界水または超臨界水条件で水中に溶けている溶存酸素だけで前記カーボンナノチューブを表面処理して表面改質する段階と、
(iii)(a)樹脂100重量部、前記樹脂100重量部に対して(b)(ii)段階で表面改質されたカーボンナノチューブ0.1〜15重量部、及び(c)炭素化合物、金属、金属化合物、またはこれらの混合物1〜40重量部、を含む組成物を製造する段階と、
を含む、電磁シールド用樹脂組成物の製造方法。 - 前記樹脂は、ポリアセタール樹脂、アクリル系樹脂、ポリカーボネート樹脂、スチレン系樹脂、ポリエステル樹脂、ビニル系樹脂、ポリフェニレンエーテル樹脂、ポリオレフィン樹脂、アクリロニトリル‐ブタジエン‐スチレン共重合体樹脂、ポリアリレート樹脂、ポリアミド樹脂、ポリアミドイミド樹脂、ポリアリールスルホン樹脂、ポリエーテルイミド樹脂、ポリエーテルスルホン樹脂、ポリフェニレンスルファイド樹脂、フッ素系樹脂、ポリイミド樹脂、ポリエーテルケトン樹脂、ポリベンゾオキサゾール樹脂、ポリオキサジアゾール樹脂、ポリベンゾチアゾール樹脂、ポリベンゾイミダゾール樹脂、ポリピリジン樹脂、ポリトリアゾール樹脂、ポリピロリドン樹脂、ポリジベンゾフラン樹脂、ポリスルホン樹脂、ポリウレア樹脂、ポリホスファゼン樹脂、液晶ポリマー樹脂、シリコン系樹脂、エポキシ樹脂、フェノール系樹脂およびポリウレタン系樹脂からなる群から選択されるいずれか一つの樹脂、二つ以上の共重合体樹脂、または二つ以上の混合物であることを特徴とする、請求項1に記載の電磁シールド用樹脂組成物の製造方法。
- 前記カーボンナノチューブは、単層(シングルウォール)カーボンナノチューブ、二層(ダブルウォール)カーボンナノチューブ、薄い多層(マルチウォール)カーボンナノチューブ、多層(マルチウォール)カーボンナノチューブ、ロープ状カーボンナノチューブ(Roped carbon nanotube)およびこれらの組み合わせからなる群から選択されることを特徴とする、請求項1に記載の電磁シールド用樹脂組成物の製造方法。
- 前記炭素化合物は、カーボンブラック、グラフェン、フラーレン、グラファイト、グラファイトオキシド、炭素繊維およびこれらの混合物からなる群から選択されることを特徴とする、請求項1に記載の電磁シールド用樹脂組成物の製造方法。
- 前記(iii)段階以前に、酸素、空気、オゾン、および過酸化水素水から選択される酸化剤を使用することなく、圧力50〜400atmと温度100〜600℃の亜臨界水または超臨界水条件下で水中に溶けている溶存酸素だけで炭素化合物を表面改質するステップをさらに含む、請求項4に記載の電磁シールド用樹脂組成物の製造方法。
- 前記金属または金属化合物は、銅、鉄、ニッケル、アルミニウム、スズ、亜鉛、銀、金、ニッケル‐銅合金、アルミナ(Al2O3)、窒化アルミナ(AlN)およびこれらの酸化物からなる群から選択されることを特徴とする、請求項1に記載の電磁シールド用樹脂組成物の製造方法。
- 前記炭素化合物、金属または金属化合物は、平均粒径が0.001〜300μmであることを特徴とする、請求項1に記載の電磁シールド用樹脂組成物の製造方法。
- (b)酸素、空気、オゾン、および過酸化水素水から選択される酸化剤を使用することなく、水中に溶けている溶存酸素だけを使用して表面改質されたカーボンナノチューブと、(c)炭素化合物、金属、金属化合物またはこれらの混合物との重量比が1:0.01〜100であることを特徴とする、請求項1に記載の電磁シールド用樹脂組成物の製造方法。
- 請求項1から8のいずれか1項に記載の電磁シールド用樹脂組成物の製造方法により得た電磁シールド用樹脂組成物を押出、射出または熱成形する、成形物の製造方法。
- 前記成形物は、電磁シールドの効果の調節により、熱伝導性、静電分散または静電気防止が可能なプラスチック成形物であることを特徴とする、請求項9に記載の成形物の製造方法。
- 前記成形物は、自動車の軽量化のための電子制御装置(Electronic Control Unit)の用途に用いられることを特徴とする、請求項9に記載の成形物の製造方法。
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