高模量低收缩涤纶工业丝的开发

Development of high-modulus low-shrinkage polyester industrial yarn

采用特性黏数0.67 dL/g的大有光涤纶切片,通过固相缩聚后高速纺丝,生产高模量低收缩涤纶工业丝,讨论了纺丝工艺条件对纤维性能的影响。结果表明:控制涤纶无油丝特性黏数大于等于0.95 dL/g,纺丝速度3 400 m/min,喷丝头拉伸倍数约300,适当降低后加热器温度或缩短隔热区长度,有利于提高涤纶工业丝的模量和尺寸稳定性(DS值);生产的167 dtex涤纶工业丝断裂强度7.6 cN/dtex,断裂伸长率10.8%,干热收缩率3.1%,定负荷伸长5.3%,DS值8.4%。

A high-modulus low-shrinkage polyester industrial yarn was prepared from bright polyester ehip with the intrinsic viscosity of 0.67 dL/g by high-speed spinning process subsequently to solid-state polyeondensation. The effects of spinning conditions on the fiber properties were discussed. The results showed that the improvement of the modulus and dimension stability （ DS value） of polyester industrial yarn would be beneficial from controlling the intriusie viscosity of oil-free filament not less than 0.95 dI,/g, spinning speed 3 400 m/min and spinneret draft ratio about 300 and rationally decreasing the post-heating temperature or insulation zone length. The obtained 1 677 dtex polyester industrial yarn had the breaking strength of 7.6 eN/dtex, elongation at break 10.8%, dry hot shrinkage 3.1%, constant load elongation 5.3% and DS value 8.4%.