超大容量熔体直纺仿棉共聚酯纤维产业化工艺优化

针对仿棉聚酯纤维在20万 t/a熔体直纺装置上产业化的难点，对共聚酯可控聚合工艺、熔体输送过程模拟和纺丝牵伸工艺进行研究。第一酯化后添加第四单体山梨醇，终缩聚之前添加第三单体聚乙二醇，可生产性能指标满足要求且稳定的共聚酯；通过熔体管道长距离输送模拟，熔体输送过程中主要调节熔体温度、熔体黏度、第一热媒温度来改变熔体黏度降、熔体温度降；纺丝过程中采用中空和十字复合喷丝板，并调节纺丝温度、冷吹风条件、卷绕速度等来控制异形度，在假捻过程中使用皮圈式假捻器等，可获得稳定、优质的共仿棉聚酯纤维。

Cotton-like co-polyester fiber industrialization in melt direct spinning of ultra-high capacity

In order to solve the difficultiesin fiber industrialization of the cotton-like co-polyester in melt direct spinning of 200,000t/a capacity, the technology of contrallable polymerization, the simulation of melt transportation and the process of spinning and drawing incopolyester was studied.The fouth monomer sorbitolwas added after first esterification reactor and the third monomer PEG wasadded before the final polycondensation reaction to produce stable copolyester with indexes meetingrequirements; and by the simulation of the long-distance melt transportation, it wasfound that changes of the melt temperature, melt viscosity and the primary hottemperaturewould affect themelt viscosity dropand the melt temperature dropin the melt transportation process; and the degree of profiles would be controlled by using the cross/hollow spinneret and adjusting the melt temperature, cold blow and take-up speed. The nip twister was used in the false twisting process, thus the obtained cotton-like co-polyester fibers were stable and high in quality.