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本发明是一种聚丙烯腈基碳纤维原丝预氧化前处理工艺,其特征在于,在聚丙烯腈基碳纤维原丝预氧化前,将聚丙烯腈基碳纤维原丝置于质量分数为5%~15%的高锰酸钾溶液中浸渍处理1~10 min,浸渍温度为50~90℃;浸渍完毕后,将聚丙烯腈基碳纤维原丝进行水洗和烘干。经过本发明处理的碳纤维用聚丙烯腈原丝能够使预氧化反应在较低的环化反应起始温度下进行,且原丝的放热量增加,预氧化程度有所提高。本发明
The present invention is a polyacrylonitrile-based carbon fiber precursor pre-oxidation process, characterized in that before the polyacrylonitrile-based carbon fiber precursor pre-oxidation, the polyacrylonitrile-based carbon fiber precursor is placed in mass fraction of 5% 15% of potassium permanganate solution immersion treatment 1 ~ 10 min, immersion temperature of 50 ~ 90 ℃; impregnated polyacrylonitrile-based carbon fiber precursor was washed and dried. The polyacrylonitrile precursor fiber for carbon fiber treated by the invention can make the pre-oxidation reaction proceed at a lower initial temperature of the cyclization reaction, and the exothermic heat of the precursor yarn increases so that the degree of pre-oxidation is improved. this invention