JP7214228B2 - 超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法 - Google Patents
超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法 Download PDFInfo
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Description
2 液体N2タンク
3 N2増圧ステーション
4 液体CO2タンク
5 CO2増圧ステーション
6 吸気弁
7 立体発泡システム
8 圧力制御装置
9 温度制御装置
10 圧力開放装置
11 消音器
12 排気弁
13 予熱システム
14 温度制御装置
15 加熱循環装置
Claims (7)
- 超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法であって、超臨界流体搬送システム、立体発泡システム、予熱システムを含み、超臨界流体搬送システムは、超臨界CO2又は超臨界N2搬送システムか、又は、N2/CO2混合ガス搬送システムであり、立体発泡システムは、立体発泡容器、温度制御装置、圧力制御装置、圧力開放装置を含み、前記超臨界流体搬送システムは立体発泡システムに接続され、前記予熱システムは、予熱容器、加熱循環装置、温度制御装置を含み、
一段階成形法を用い、超臨界流体でポリマーを膨潤及び浸漬することにより、自由に、金型を要することなく、且つ立体的に、減圧によって直に立体発泡容器で発泡成形し、
具体的な操作手順として、
ポリマー原料を加圧成形して発泡プリフォームを取得し、発泡プリフォームを予熱システム内で予熱して予熱温度まで昇温してから、立体発泡容器に発泡プリフォームを投入して立体発泡容器の密封カバーを閉止し、前記立体発泡容器の動作中は、常にポリマーの融解温度又は融点温度よりも1.0~50℃低い目標温度に維持し、吸気弁を開放して超臨界流体を導入してから、目標の温度及び動作圧力5~15Mpaとなるよう調節すると、超臨界流体がポリマーを膨潤させながら拡散し、続いて、前記吸気弁の開放から30~120分後に圧力開放装置を開放することで減圧により発泡させれば、製品形状、サイズ精度、気泡が緻密であり、且つ製品密度を制御可能なポリマーの微細孔発泡製品が得られ、
前記ポリマーは、ポリエチレン、ポリ乳酸、ポリプロピレン、ポリスチロール、ポリメタクリル酸メチル、ポリカーボネート、アクリロニトリル-ブタジエン-スチレン共重合体、ポリエチレンテレフタラート、ポリアミド、ポリイミド、ポリフェニレンスルファイド、ポリエーテルサルフォン、ポリエーテルエーテルケトン、ゴム、シリコーンゴム、エチレンプロピレンジエンモノマー、エチレン/酢酸ビニル共重合体、熱可塑性ポリウレタン、熱可塑性エラストマーのいずれか1つ又は組成物から選択されることを特徴とする方法。 - 無定形ポリマーをポリマーとして選択し、前記目標温度はポリマーの融解温度よりも1.0~50℃低く、圧力は5~15MPaであることを特徴とする請求項1に記載の超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法。
- 結晶性ポリマーをポリマーとして選択し、前記目標温度はポリマーの融点温度よりも1.0~50℃低く、圧力は5~15MPaであることを特徴とする請求項1に記載の超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法。
- 前記立体発泡容器と圧力開放装置の減圧速度は、1~1000MPa/sであることを特徴とする請求項2又は3に記載の超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法。
- 前記超臨界CO2搬送システムは、液体CO2タンク、CO2増圧ステーションを含み、前記超臨界N2搬送システムは、液体N2タンク、N2増圧ステーションを含むことを特徴とする請求項2又は3に記載の超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法。
- 前記超臨界流体搬送システムは、N2/CO2混合ガス搬送システムであり、N2の体積パーセンテージは50~99%であることを特徴とする、請求項1に記載の超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法。
- ポリマーの微細孔発泡製品の体積膨張倍率は2~60倍、平均孔径は0.1~100μm、孔密度は1.0×10 6 ~1.0×10 15 個/cm3であることを特徴とする請求項2又は3に記載の超臨界流体により発泡時に金型を要することなくポリマーの微細孔発泡製品を製造する方法。
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