高流动性PA 6超细纤维的制备及其性能研究

摘要

采用自制的高流动性聚己内酰胺(HPA 6)、普通聚己内酰胺(PA 6)、低密度聚乙烯(LDPE)为原料,通过共混纺丝法分别制备HPA 6/LDPE定岛纤维和HPA 6/PA 6/LDPE不定岛纤维,溶解去除LDPE,得到一系列HPA 6超细纤维;研究了HPA 6的可纺性及其超细纤维的线密度、力学性能、染色性能等.结果表明:由于HPA 6在纺丝温度下较好的流动性和高支化结构及大量末端基团,HPA 6可纺性良好;HPA 6/LDPE质量比为70/30时,157.4 dtex/36 f HPA 6超细纤维断裂强度为3.85 cN/dtex,断裂伸长率为14%,染色深度为1.809,色牢度达5级;HPA 6超细纤维的力学性能和染色性能优异,与PA 6超细纤维性能相当,可拓展其在纤维领域的应用.%By using a self-made high-flowability polycaprolactam (HPA 6), traditional polycaprolactam (PA 6) and low-density polyethylene (LDPE) as raw material, an HPA 6/LDPE figured islands-in-sea fiber and an HPA 6/PA 6/LDPE unfigured islands-in-sea fiber were prepared via blend spinning process, which were produced into HPA 6 ultrafine fibers by removing LDPE.The spinnability of HPA 6 and the linear density, mechanical properties and dyeing behavior of the ultrafine fiber were studied.The results showed that HPA 6 exhibited fairly good spinnability due to the high flowability at spinning temperature, highly-branched structure and a large amount of end groups;the HPA 6 ultrafine fiber of 157.4 dtex/36 f had the breaking strength of 3.85 cN/dtex, elongation at break 14%, dyeing depth 1.809 and color fastness grade 5 as the HPA 6/LDPE mass ratio was 70-30;HPA 6 ultrafine fiber possessed excellent mechanical properties and dyeing behavior equal to those of PA 6 ultrafine fiber, so its application could be expanded in fiber field.