再生聚酯纤维中的重金属锑的析出研究

Study on migration of antimony from recycled polyester fibers

利用电感耦合等离子体原子发射光谱仪分析了再生聚酯纤维及其原料和加工过程中的重金属锑含量,通过模拟汗液研究了再生聚酯纤维中锑析出的影响因素。结果表明:废旧聚酯泡料中锑的含量为160.43μg/g,远大于瓶片料中的锑含量111.25μg/g和原生切片中的锑含量96.75μg/g;在利用泡料制备再生聚酯纤维的加工过程中,熔体输送阶段锑含量变化不明显,而纺丝后锑含量显著下降为109.53μg/g;在模拟汗液析出过程中,温度升高有利于再生聚酯纤维中锑的析出,而时间延长以及pH值减小会使锑的析出增加,在迁移时间达到120min后锑析出量达到平衡,约为1.3μg/g。

The content of antimony in different raw material and recycled polyester fibers was analyzed at different processing stages by inductively coupled plasma atomic emission spectrometry.And the influential factors on the migration of antimony in recycled polyester fibers were emphatically investigated by sweat simulatin.The results showed that the content of antimony in waste polyester foam was 160.43μg/g,which was much higher than 111.25μg/g in bottle flake and 96.75μg/g in primary chip;the content of antimony did not change significantly at the melt conveying stage in the process of recycling foam material into polyester fiber,but profoundly decreased to 109.53μg/g after spinning;the temperature elevation was conducive to the antimony migration from recycled polyester fiber in simulated sweat while the prolonged time and reduced pH value would increase the antimony migration,which reached a balance about 1.3μg/g at the migration time longer than 120 min.