涤纶工业丝液相增黏技术的研发

Research of liquid-state polycondensation technology for polyester industrial yarn

通过比较卧式和立式增黏反应器对聚酯液相增黏反应的影响,自主设计研制了生产能力为29 t/d的立式液相增黏反应器;将聚酯切片螺杆加热熔融后的熔体进行增黏反应,探讨了液相增黏工艺条件,并对比分析了液相增黏与固相缩聚后纺制的涤纶工业丝的性能。结果表明:聚酯液相增黏后的熔体特性黏数达1.05 dL/g,b值小于3,端羧基浓度约25 mol/t;增黏后的熔体进行直接纺丝,生产的涤纶工业丝的各项性能指标均能达到固相缩聚熔融纺丝工艺的同等水平,断裂强度为8.33 cN/dtex,断裂伸长率为15.4%;液相增黏技术具有设备投资省、能耗和运行成本低等特点。

The effects of horizontal and vertical polycondensation reactors on polyester liquid-state polycondensation were inves tigated. A vertical liquid-state polycondensation reactor with the production capacity of 29 t/d was designed and developed, which was used for the polyeondensation reaction of polyester chip melt after screw heating and melting. The liquid-state polycon densation process conditions were discussed. And the properties of polyester industrial yams were contrasted and analyzed after liquid-state or solid-state polycondensation reaction. The results showed that the melt after liquid-state polycondensation had the intrinsic viscosity up to 1.05 dL/g, b value below 3 and carboxyl end group concentration of 25 mol/t or so; the melt after liquid-state polycondensation was directly spun into polyester industrial yam with the physical index equal to the yam prepared by solid state polycondensation among which the breaking strength was 8.33 eN/dtex and elongation at break 15.4% ; the liquid-state polycondensation technology had the characteristics of low equipment investment, energy consumption and production cost.