Preparation of pitch precursor with excellent spinnability for general-purpose carbon fibre using coal tar pitch as raw material  

作　　者：Jinchang Liu Chenyang Shen Lujie Huang Tinghao Fang Yaping Li Dingcheng Liang Qiang Xie 

机构地区：[1]School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第2期22-28,共7页中国化学工程学报（英文版）

基　　金：the financial support provided by the National Natural Science Foundation of China (22008254);the Fundamental Research Funds for the Central Universities (2020XJHH01);the National Training Program of Innovation and Entrepreneurship for Undergraduates (C202003309);China University of Mining and Technology (Beijing) Yueqi Outstanding Scholar Project (2020JCB02)。

摘　　要：Tetrahydrofuran(THF) extract of coal tar pitch(CTP) was used instead of blending CTP with pretreated pyrolysis fuel oil to prepare an isotropic pitch precursor with excellent spinnability for general-purpose carbon fibre through bromination-dehydrobromination. The feasibility and effectiveness of synthesising an isotropic pitch precursor derived from THF-soluble(CTP-THFs) is demonstrated in this study.The results show that CTP-THFs contains more light components than CTP;CTP-THFs and CTP monomer proportions were 62.52% and 45.32%, respectively. However, based on comparisons of CTP-THFsBr0 and CTPBr0 characterisations, CTP-THFs exhibits better polycondensation than CTP. Bromination-dehydrobro mination promotes polycondensation of pitch precursors, leading to greater carbon aromaticity in CTP-THFsBr5, CTP-THFsBr10, and CTP-THFsBr15 than that in CTP-THFsBr0 and CTPBr0. CTP-THFsBr5 and CTP-THFsBr10 have excellent spinnability even with softening points as high as 230 ℃. The pericondensed carbon and carbon aromaticity of CTP-THFsBr5 and CTP-THFsBr10 are high owing to the higher degree of polycondensation;however, they still possess a more linear molecular structure. The as-prepared carbon fibre exhibits homogeneity and uniformity, and the mechanical performance is comparable with that of commercial general-purpose carbon fibre products.

关 键 词：Carbon fibre Isotropic pitch Coal tar pitch(CTP) High spinnability Bromination–dehydrobromination 

分 类 号：TQ342.742[化学工程—化纤工业]