煤直接液化残渣制备中间相沥青炭纤维

Mesophase pitch based carbon fiber prepared from direct coal liquefaction residue

中间相沥青炭纤维性能优异,但是高成本限制了它的大规模使用。尝试以煤直接液化残渣为原料制备中间相沥青炭纤维。一方面为开发低成本中间相沥青炭纤维提供原料;另一方面为煤直接液化残渣的高附加值利用拓宽了途径。通过热缩聚工艺得到中间相沥青,经过纺丝、预氧化和炭化制备中间相沥青炭纤维,验证煤直接液化残渣制备中间相沥青炭纤维的可行性。研究了中间相含量、软化点和挥发分含量对中间相沥青可纺性的影响。结果表明,以煤直接液化残渣为原料制备的中间相含量在70%以上、软化点高于300℃的中间相沥青具有较好的可纺性,纺制的炭纤维直径约为15μm,拉伸强度达到1 500 MPa,拉伸模量150GPa。

Large scale application of mesophase pitch based carbon fibers （MPCFs） was limited due to its high cost. Using direct coal liquefaction residue （DCLR） as raw materials for mesophase pitch preparation could re duce the cost of MPCF, and provide a method for high value application of DCLR. Mesophase pitch was pre- pared from de-ashed DCLR by heat condensation, then the mesophase pitch was spun, oxidation stabilized and carbonized. The feasibility of DCLR as raw material for mesophase pitch preparation was demonstrated. Mean- while, the influence of mesophase content, softening point and volatile content on spinnability of the mesophase pitch was studied. The results show a good spinnahility of mesophase pitch while the mesophase content higher than 70%, and softening point higher than 300 ℃. The diameter of carbon fiber prepared from de-ashed direct coal liquefaction residue is 15μm, tensile strength is 1 500 MPa and tensile modulus is 150 GPa.