Method for producing precursor, flameproofed fiber and carbon fiber



PROBLEM TO BE SOLVED: To provide methods for producing a precursor for a highly oriented and high-strength carbon fiber and the carbon fiber with which the operation conditions of an apparatus for production is stabilized. SOLUTION: The method for producing the precursor is carried out as follows. A steam treatment of the precursor drawn by varying the steam temperature at an optional draw ratio is conducted at a temperature within the temperature range of (T-4) to (T+6)°C including a temperature T°C exhibiting the maximum specific gravity of a specific gravity-steam treating temperature curve determined under measuring conditions of 250°C, 1 h and a constant length and at the draw ratio, etc., at that time. Furthermore, the method for producing the carbon fiber comprises flame-proofing the precursor in an oxidizing gas atmosphere, providing the flameproofed fiber and then heat-treating the resultant flameproofed fiber in an inert gas atmosphere. COPYRIGHT: (C)2005,JPO&NCIPI
【課題】製造装置の運転状態を安定化させ、高配向、高強度の炭素繊維用プリカーサー及び炭素繊維の製造方法を提供する。 【解決手段】任意の延伸倍率においてスチーム温度を変えて延伸したプリカーサーを用いて250℃で1hr且つ定長の測定条件で求めた比重−スチーム処理温度曲線の最大比重を示す温度T℃を含み(T−4)〜(T+6)℃の範囲内の温度とその時の延伸倍率などでスチーム処理することを特徴とするプリカーサーの製造方法、並びに、そのプリカーサーを酸化性ガス雰囲気下で耐炎化処理して耐炎化繊維を得、その後前記耐炎繊維を不活性ガス雰囲気下で熱処理することを特徴とする炭素繊維の製造方法。 【選択図】 なし




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