以废旧纺织品回收尼龙6(PA6)为原料,通过熔融纺丝法以3000m/min的纺丝速率制备了再生PA6纤维。通过元素分析、傅里叶转换红外光谱(FT-IR)和核磁共振氢谱(1H-NMR)等手段对回收PA6中含有的杂质离子及其结构进行表征,并且通过热重分析(TG)、差示扫描量热(DSC)和广角X射线衍射(WAXD)等手段研究了再生PA6纤维的稳定性、热性能和力学性能。结果表明:与纯PA6纤维相比,再生PA6纤维同样具有良好的热稳定性和尺寸稳定性;回收PA6中残余过多的Ca2+会与PA6纤维发生络合反应,破坏分子间的氢键,导致再生PA6纤维的热稳定性变差、熔点和结晶温度降低;纤维经过拉伸定型后,纤维内部晶型无法由γ晶向α晶转变;此外,回收PA6中染料的存在会降低纤维的断裂强度。可为废旧纺织品中PA6原料的回收再循环利用提供科学指导。
Using recycled nylon 6 (PA6) from waste textiles as raw material,regenerated PA6 fibers were successfully prepared via melt spinning at a spinning speed of 3000m/min.The impurity ions in the recycled PA6 and their structures were characterized through elemental analysis,FT-IR and 1H-NMR.Additionally,the stability,thermal properties,and mechanical properties of the regenerated PA6 fibers were investigated using TG,DSC and WAXD.The findings revealed that,compared to pure PA6 fibers,the regenerated PA6 fibers also exhibited commendable thermal stability and dimensional stability.However,an excess of residual Ca2+ in the recycled PA6 could complex with the PA6 fibers and disrupt the intermolecular hydrogen bonding,leading to diminished thermal stability,lower melting point and decreased crystallization temperature of the regenerated PA6 fibers.Furthermore,after stretching and setting,the internal crystal structure of the fibers could not be transformed from γ-phase to α-phase.Moreover,the presence of dyes in the recycled PA6 diminished the fiber's breaking strength.This research offers scientific guidance for the recycling and reuse of PA6 material from waste textiles.
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