WO2019181828A1 - 導電性樹脂組成物及びその製造方法 - Google Patents
導電性樹脂組成物及びその製造方法 Download PDFInfo
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Abstract
Description
[1]熱可塑性樹脂及び導電性フィラーを含有する導電性樹脂組成物であって、導電性を向上させるための成分である染料をさらに含有し、前記熱可塑性樹脂、前記導電性フィラー、及び前記染料を含有する原料混合物を、前記熱可塑性樹脂の融点以上の温度条件下で混錬又は成型して得られる導電性樹脂組成物。
[2]前記原料混合物を、前記染料の融点以上の温度条件下で混錬又は成型して得られる前記[1]に記載の導電性樹脂組成物。
[3]前記熱可塑性樹脂が、ポリカーボネート、ポリエステル、ポリアミド、及びポリフェニレンスルフィドの少なくともいずれかである前記[1]又は[2]に記載の導電性樹脂組成物。
[4]前記染料が、ペリノン系染料、ペリレン系染料、キノリン系染料、アンスラキノン系染料、アゾメチン系染料、ジスアゾ系染料、及びチオキサンテン系染料の少なくともいずれかである前記[1]~[3]のいずれかに記載の導電性樹脂組成物。
[5]前記導電性フィラーが、カーボンブラック、マルチウォールカーボンナノチューブ、シングルウォールカーボンナノチューブ、グラファイト、及びグラフェンの少なくともいずれかである前記[1]~[4]のいずれかに記載の導電性樹脂組成物。
[6]前記染料の含有量が、前記熱可塑性樹脂と前記導電性フィラーの合計100質量部に対して0.01~5質量部であり、前記導電性フィラーの含有量が、前記熱可塑性樹脂と前記導電性フィラーの合計100質量部に対して100質量部に対して0.01~30質量部である前記[1]~[5]のいずれかに記載の導電性樹脂組成物。
[7]前記[1]~[6]のいずれかに記載の導電性樹脂組成物の製造方法であって、熱可塑性樹脂、導電性フィラー、及び染料を含有する原料混合物を、前記熱可塑性樹脂の融点以上の温度条件下で混錬又は成型する工程を有する導電性樹脂組成物の製造方法。
[8]前記原料混合物を、前記染料の融点以上の温度条件下で混錬又は成型する前記[7]に記載の導電性樹脂組成物の製造方法。
[9]前記原料混合物を射出成型する前記[7]又は[8]に記載の導電性樹脂組成物の製造方法。
以下、本発明の実施の形態について説明するが、本発明は以下の実施の形態に限定されるものではない。本発明の導電性樹脂組成物は、熱可塑性樹脂及び導電性フィラーを含有するものであり、導電性を向上させるための成分である染料をさらに含有する。そして、本発明の導電性樹脂組成物は、熱可塑性樹脂、導電性フィラー、及び染料を含有する原料混合物を、熱可塑性樹脂の融点以上の温度条件下、好ましくは染料の融点以上の温度条件下で混錬又は成型して得られるものである。以下、本発明の導電性樹脂組成物の詳細について説明する。
本発明の導電性樹脂組成物は、熱可塑性樹脂を含有する。熱可塑性樹脂としては、ポリプロピレン、高密度ポリエチレン、低密度ポリエチレン、直鎖低密度ポリエチレン、ポリフェニレンスルフィド、液晶ポリマー、不飽和ポリエステル、ポリウレタン、アクリル樹脂、ポリエーテルエーテルケトン(PEEK)、ポリエーテルサルフォン、ポリエーテルスルフィド、ポリスチレン、ポリフェニレンエーテル、アクリロニトリル-ブタジエン-スチレン共重合体(ABS)、ポリ塩化ビニル(PVC)、ポリアセタール(POM)などを挙げることができる。なかでも、ポリカーボネート、ポリエステル、ポリアミド、及びポリフェニレンスルフィドが好ましい。これらの熱可塑性樹脂は、1種単独で又は2種以上を組み合わせて用いることができる。
本発明の導電性樹脂組成物は、導電性フィラーを含有する。導電性フィラーとしては、ケッチェンブラック、アセチレンブラック、ファーネスブラック等のカーボンブラックの他、マルチウォールカーボンナノチューブ、シングルウォールカーボンナノチューブ、カップスタック型カーボンナノチューブ、グラファイト、グラフェンなどを挙げることができる。なかでも、カーボンブラック、マルチウォールカーボンナノチューブ、シングルウォールカーボンナノチューブ、カップスタック型カーボンナノチューブが好ましく、カーボンブラック、マルチウォールカーボンナノチューブ、シングルウォールカーボンナノチューブがさらに好ましい。これらの導電性フィラーは、1種単独で又は2種以上を組み合わせて用いることができる。
本発明の導電性樹脂組成物は、導電性を向上させるための成分である染料を含有する。染料と導電性フィラーを比較すると、染料のほうが熱可塑性樹脂との相溶性が高い。このため、染料を含有させることで、熱可塑性樹脂との相溶性が相対的に低い導電性フィラーが樹脂組成物の表面に配向されやすくなり、導電性樹脂組成物の表面抵抗値が低くなる(導電性が向上する)と考えられる。すなわち、染料は、樹脂中における導電性フィラーの分散性向上に寄与する機能を有する成分であり、染料が分散材として機能することで導電性フィラーが樹脂中に良好な状態で分散され、得られる樹脂組成物の導電性が低下したものと推測される。したがって、本発明の導電性樹脂組成物は、導電性フィラーの配合量が少ない場合であっても、より優れた導電性を示すものである。さらに、導電性フィラーの配合量を減らすことができるため、熱可塑性樹脂本来の特性が維持されやすいといった利点もある。
導電性樹脂組成物には、必要に応じて、熱可塑性樹脂、導電性フィラー、及び染料以外の成分(その他の成分)を配合することができる。その他の成分としては、例えば、酸化防止剤、難燃剤、滑剤などを挙げることができる。
本発明の導電性樹脂組成物は、前述の熱可塑性樹脂、導電性フィラー、及び染料を含有する原料混合物を、熱可塑性樹脂の融点以上の温度条件下で混錬又は成型して得られるものである。すなわち、本発明の導電性樹脂組成物の製造方法は、上記の原料混合物を、熱可塑性樹脂の融点以上の温度条件下で混錬又は成型する工程(混錬・成型工程)を有する。
(実施例1)
ポリカーボネート(商品名「L1225WP」、帝人社製、融点:約250℃)95部、及びマルチウォールカーボンナノチューブ(MWNT、商品名「NC7000」、Nanocyl社製)5部をミキサー(商品名「スーパーミキサー 型式SMB-20」、川田製作所社製)に投入し、1分間混合して混合物を得た。設定温度280℃の二軸押出機(商品名「TEX30」、日本製鋼所社製)に得られた混合物を投入し、溶融混錬及び造粒して造粒物を得た。得られた造粒物、及びSolvent Red 179(商品名「MACROLEX RED E2GGRAN」、ランクセス社製)0.5部をポリ袋に入れて混合し、原料混合物1を得た。
表1-1及び1-2に示す配合(単位:部)としたこと以外は、前述の実施例1と同様にして原料混合物2~24を調製した。また、原料混合物1に代えて、調製した原料混合物2~24をそれぞれ用いたこと、及びシリンダー温度を表3に示す温度(成型温度)としたこと以外は、前述の実施例1と同様にしてプレートを製造した。使用した染料の詳細を表2に示す。なお、ポリブチレンテレフタレートの融点は約220℃であり、ポリフェニレンスルフィドの融点は約280℃であり、ポリアミド6の融点は約225℃である。また、表1-1及び1-2中の「カーボンブラック」は、デンカ社製のアセチレンブラック(商品名「デンカブラック粒状」)である。
(表面抵抗値の測定(1))
抵抗率計(商品名「ロレスタGP」、型式「MCP-HT450」、三菱ケミカルアナリテック社製)を使用し、製造したプレートの表面抵抗値を測定した。なお、プローブにはASPプローブ(型番「MCP-TP03P」、三菱ケミカルアナリテック社製)を使用し、印加電圧90Vの条件でプレートの表面抵抗値を測定した。測定結果を表3に示す。
(実施例21)
ポリカーボネート(商品名「L1225WP」、帝人社製、融点:約250℃)100部、シングルウォールカーボンナノチューブ(SWNT、商品名「TUBALL」、OCSiAl社製)0.03部、及びSolvent Red 179(商品名「MACROLEX RED E2GGRAN」、ペリノン系染料、融点255℃、ランクセス社製)0.05部を設定温度280℃のラボプラストミル(東洋精機社製)に投入し、溶融混錬して樹脂組成物を得た。得られた樹脂組成物を設定温度280℃のプレス成型機(神藤金属工業所社製)を使用してプレス成型し、1mmtのプレス成型物を製造した。
Solvent Red 179を用いなかったこと以外は、前述の実施例21と同様にしてプレス成型物を製造した。
(表面抵抗値の測定(2))
前述の「表面抵抗値の測定(1)」と同様にして、製造したプレス成型物の表面抵抗値を測定した。その結果、実施例21で得たプレス成型物の表面抵抗値は8.60E+06(Ω/□)であり、比較例8で得たプレス成型物の表面抵抗値は1.00E+08≦(Ω/□)であった。
Claims (9)
- 熱可塑性樹脂及び導電性フィラーを含有する導電性樹脂組成物であって、
導電性を向上させるための成分である染料をさらに含有し、
前記熱可塑性樹脂、前記導電性フィラー、及び前記染料を含有する原料混合物を、前記熱可塑性樹脂の融点以上の温度条件下で混錬又は成型して得られる導電性樹脂組成物。 - 前記原料混合物を、前記染料の融点以上の温度条件下で混錬又は成型して得られる請求項1に記載の導電性樹脂組成物。
- 前記熱可塑性樹脂が、ポリカーボネート、ポリエステル、ポリアミド、及びポリフェニレンスルフィドの少なくともいずれかである請求項1又は2に記載の導電性樹脂組成物。
- 前記染料が、ペリノン系染料、ペリレン系染料、キノリン系染料、アンスラキノン系染料、アゾメチン系染料、ジスアゾ系染料、及びチオキサンテン系染料の少なくともいずれかである請求項1~3のいずれか一項に記載の導電性樹脂組成物。
- 前記導電性フィラーが、カーボンブラック、マルチウォールカーボンナノチューブ、シングルウォールカーボンナノチューブ、グラファイト、及びグラフェンの少なくともいずれかである請求項1~4のいずれか一項に記載の導電性樹脂組成物。
- 前記染料の含有量が、前記熱可塑性樹脂と前記導電性フィラーの合計100質量部に対して0.01~5質量部であり、
前記導電性フィラーの含有量が、前記熱可塑性樹脂と前記導電性フィラーの合計100質量部に対して0.01~30質量部である請求項1~5のいずれか一項に記載の導電性樹脂組成物。 - 請求項1~6のいずれか一項に記載の導電性樹脂組成物の製造方法であって、
熱可塑性樹脂、導電性フィラー、及び染料を含有する原料混合物を、前記熱可塑性樹脂の融点以上の温度条件下で混錬又は成型する工程を有する導電性樹脂組成物の製造方法。 - 前記原料混合物を、前記染料の融点以上の温度条件下で混錬又は成型する請求項7に記載の導電性樹脂組成物の製造方法。
- 前記原料混合物を射出成型する請求項7又は8に記載の導電性樹脂組成物の製造方法。
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