摘要
黑色缝纫线型短纤维在夏季高温季节容易出现断裂强力下降,纱线强力降低。在常规半光PET切片(特性黏度为0.680 dL/g)中添加质量分数7.0%黑色母粒(特性黏度为0.685 dL/g)混合后,进行熔融纺丝。通过优化牵伸工艺,三级牵伸工艺下的成品短纤维的物理性能明细优于两级牵伸工艺,且放置一个月后三级牵伸工艺的成品短纤维的断裂强度衰减幅度小。采用三级牵伸工艺,第一牵伸倍率为3.3、第二牵伸倍率为1.23、第三牵伸倍率为1.03、紧张热定型温度为210℃时,成品短纤维的断裂强度最高,达到6.31 cN/dtex,180℃干热收缩率较小为3.28%。三级牵伸工艺下成品纤维的结晶度为43.4%,晶胞尺寸相对较为规整,取向度为90.1%,说明此工艺下成品纤维大分子取向结构较好,因此纤维的断裂强度较高。
The black sewing thread type staple fiber is prone to decrease in breaking strength,subsequently,leading strength decrease in the yarn,at high temperatures in summer.Adding a mass fraction of 7.0%black masterbatch to the conventional semi-dull PET chips and then melt-spinning was performed to prepare the original yarn.By optimizing the drawing process,the physical properties of the final staple fiber prepared by the three-stage drawing process were better than that of the two-stage drawing process,and the breaking strength of the final staple fiber was less attenuated after one month.Using the three-stage drawing process,the prepared short fiber had the highest breaking strength,reaching 6.31 cN/dtex,and the dry heat shrinkage rate under 180℃was only 3.28%.The specific process was as follows:the first drawing ratio was 3.3,the second drawing ratio was 1.23,the third drawing ratio was 1.03,and the tension heat-setting temperature was 210℃.The crystallinity of the final fiber under this process was 43.4%,with regular unit cell,and the degree of orientation was 90.1%,indicating that the final fiber had a good macromolecular orientation structure,leading a higher performance in breaking strength.
作者
王伟
潘晓娣
吴亮
薛斌
陈彪
严岩
Wang Wei;Pan Xiaodi;Wu Liang;Xue Bin;Chen Biao;Yan Yan(Sinopec Yizheng Chemical Fibre Co.,Ltd.,Yizheng Jiangsu 211900,China;Jiangsu Key Laboratory of High Performance Fiber,Yizheng Jiangsu 211900,China)
出处
《合成技术及应用》
2021年第1期11-16,共6页
Synthetic Technology & Application
基金
国家重点研发计划项目(2016YFB0302802)。
关键词
PET纤维
取向度
结晶度
多级牵伸
声速取向
PET fiber
orientation degree
crystallinity
multi-stage drawing
sonic orientation
