JP7390319B2 - 炭素繊維の製造のための前駆体繊維の安定化のための方法および装置 - Google Patents
炭素繊維の製造のための前駆体繊維の安定化のための方法および装置 Download PDFInfo
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Description
Claims (21)
- 炭素繊維製造のための前駆体繊維を安定化するための方法であって、
前記前駆体繊維を第1の温度に加熱し、前記前駆体繊維を前記第1の温度で所定の期間維持する第1加熱工程と、
続いて、前記前駆体繊維を前記第1の温度よりも高い少なくとも第2の温度に加熱し、前記前駆体繊維を前記第2の温度で所定の期間維持する第2加熱工程を含み、
前記前駆体繊維は、前記第1加熱工程および前記第2加熱工程中、および前記第1加熱工程と前記第2加熱工程との間において、12mBar~300mBarの範囲の負圧を有するガス雰囲気内にある、方法。 - 前記前駆体繊維が、前記第1加熱工程および前記第2加熱工程中、および前記第1加熱工程と前記第2加熱工程との間において、50mBar~200mBarの範囲の負圧を有するガス雰囲気内にある、請求項1に記載の方法。
- 炭素繊維製造のための前駆体繊維を安定化するための方法であって、
前記前駆体繊維を第1の温度に加熱し、前記前駆体繊維を前記第1の温度で所定の期間維持する第1加熱工程と、
続いて、前記前駆体繊維を前記第1の温度よりも高い少なくとも第2の温度に加熱し、前記前駆体繊維を前記第2の温度で所定の期間維持する第2加熱工程を含み、
前記前駆体繊維は、前記第1加熱工程および前記第2加熱工程中、および前記第1加熱工程と前記第2加熱工程との間、2.5mBar~63mBarの範囲の酸素分圧を有するガス雰囲気内にある、方法。 - 前記前駆体繊維が、前記第1加熱工程および前記第2加熱工程中、および前記第1加熱工程と前記第2加熱工程との間で、10.5mBar~42mBarの範囲の酸素分圧を有するガス雰囲気内にある、請求項3に記載の方法。
- 前記前駆体繊維が、少なくとも1つのさらなる中間温度を経由して前記第1の温度から前記第2の温度まで段階的に加熱され、連続する加熱工程間の温度差が少なくとも5℃であり、前記前駆体繊維は、所定の期間、前記少なくとも1つの中間温度に維持される、請求項1から4のいずれか一項に記載の方法。
- 時間的に連続する段階は負の温度差を有することができ、前記前駆体繊維の一時的な冷却が存在するが、この冷却は、温度を前記第1の温度より低くは下げない、請求項3に記載の方法。
- 前記第2の温度が、前記第1の温度よりも少なくとも30℃高い、請求項1から6のいずれか一項に記載の方法。
- 前記前駆体繊維が、前記第1の温度、前記第2の温度、およびオプションとしての少なくとも1つの中間温度で少なくとも10分間維持される、請求項1から7のいずれか一項に記載の方法。
- 前記前駆体繊維がPAN繊維であり、前記第1の温度が220~320℃の範囲にあり、前記第2の温度が280~400℃の範囲にある、請求項1から8のいずれか一項に記載の方法。
- 前記第1の温度が260~320℃の範囲にあり、前記第2の温度が300~380℃の範囲にある、請求項1から9のいずれか一項に記載の方法。
- 前記前駆体繊維がセルロースおよび/またはリグニンに基づいており、前記第1の温度が200~240℃の範囲にあり、前記第2の温度が240~300℃の範囲にある、請求項1から8のいずれか一項に記載の方法。
- 前記前駆体繊維が、処理中に負圧領域を連続的に通過する、請求項1から11のいずれか一項に記載の方法。
- 前記前駆体繊維が、前記方法の間、規定された張力下に保たれる、請求項1から12のいずれか一項に記載の方法。
- 前記ガス雰囲気は連続的または断続的に交換される、請求項1から13のいずれか一項に記載の方法。
- 前記前駆体繊維が、前記方法中に、異なる温度の少なくとも2つの隣接するゾーンを有する少なくとも1つのマッフル炉を通って移動される、請求項1から5のいずれか一項に記載の方法。
- 炭素繊維製造のための前駆体繊維を安定化するための装置であって、
前記前駆体繊維を通過させるように構成され、かつ300mBar未満の圧力まで排気可能な、少なくとも1つの細長い真空チャンバーと、
前記前駆体繊維を、前記少なくとも1つの真空チャンバーにシールされた状態で導入するための、前記少なくとも1つの真空チャンバーの一端にある少なくとも1つのエアロックユニットと、
前記少なくとも1つの真空チャンバーから前記前駆体繊維をシールされた状態で取り出すための、前記少なくとも1つの真空チャンバーの一端にある少なくとも1つのエアロックユニットと、
複数の加熱ゾーン内の前記少なくとも1つの真空チャンバーを少なくとも2つの異なる温度に加熱するように構成された少なくとも2つの個別に制御可能な加熱要素を有する少なくとも1つの加熱ユニットを備え、前記複数の加熱ゾーンは前記少なくとも1つの真空チャンバーの長手方向に隣接する、装置。 - 前記前駆体繊維を、所望の速度および所望の張力下で前記真空チャンバーを通って連続的に移送するように構成された搬送ユニットをさらに備える、請求項16に記載の装置。
- 前記搬送ユニットは、3K繊維束あたり0.5~10Nの間の力で、前記移送中に前記前駆体繊維を規定された張力下に維持するように構成される、請求項17に記載の装置。
- 前記加熱ユニットは、前記少なくとも1つの真空チャンバーを少なくとも3つの加熱ゾーン内で異なる温度に加熱するように構成される、請求項16から18のいずれか一項に記載の装置。
- 前記加熱ユニットは、前記少なくとも1つの真空チャンバーを第1の加熱ゾーン内で200~320℃の範囲の第1の温度に加熱し、第2の加熱ゾーン内で280~400℃の範囲の第2の温度に加熱するように構成される、請求項16から19のいずれかに記載の装置。
- 前記装置は、少なくとも2つの積み重ねられた真空チャンバーおよび少なくとも1つの偏向ユニットを備え、
前記偏向ユニットは、上下に配列された前記真空チャンバーの端部を真空気密に互いに接続して連続真空空間を形成し、前記偏向ユニットは、前記前駆体繊維を1つの真空チャンバーから次の真空チャンバーに案内するための少なくとも1つの繊維ガイドを含む、請求項16から20のいずれか一項に記載の装置。
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