PET/聚酯回收:再用于长丝的要求和回收方案

PET/polyester recycling: requirements and recyclingsolutions for reuse in filaments

聚对苯二甲酸乙二醇酯(PET)为一种线性聚酯,用于生产塑料瓶与纺织用纤维和长丝。PET瓶是成功实现机械回收的典型案例,聚酯纤维和长丝同样也可以很好地回收。两种回收材料的来源不同:PET瓶作为消费后的废弃物,可以从瓶子收集系统中获得,而聚酯纤维和长丝等废料通常作为纺织厂的生产废料获得。介绍了通过机械回收将PET和聚酯转变为颗粒,并再用于制备聚酯连续长丝以进行PET/聚酯回收的升级回收方式。在聚酯的升级回收过程中,精细过滤和增加其特性黏度是需要解决的关键问题。因此,详细讨论了如何优化这些过程。

Polyethylene terephthalate(PET)is a linear polyester that is used in the production of plastic bottles,fibers and filaments for textile application.PET bottle is a typical successful example of mechanical recycling,and polyester fiber and filament can also be recycled very well.The 2 types of materials are obtained from different sources:while PET bottles are available as post-consumer waste from bottle collection systems,polyester waste typically accrues in the form of production scrap from a textile mill.This article covers upcycling options for PET and polyester by means of mechanical recycling into pellets and reuse for polyester continuous filament.In polyester upcycling,fine filtration and inherent viscosity(IV)increase are the key aspects that need to be addressed;the article therefore provides a detailed discussion of how to optimize these steps.