废旧PET纺织品致密化对再生PET结构及性能的影响  

Effect of densification of post-consumer PET fabric on structure and properties of recycled PET chip

作　　者：严朝[1] 杨中开[1] 唐世君[2] 赵国樑[1] 

机构地区：[1]北京服装学院材料科学与工程学院,北京100029 [2]总后军需装备研究所,北京100088

出　　处：《合成纤维工业》2015年第2期19-22,27,共5页China Synthetic Fiber Industry

基　　金：国家863计划项目(2012AA063006)

摘　　要：选用废旧聚酯(PET)布料、经过致密化处理制成半熔融致密料、熔融挤出料和团粒料3种致密化原料,再将废旧PET布料及其致密化原料在相同工艺条件下醇解、再聚合制得再生PET切片;对废旧PET布料、致密化原料及其再生PET切片的结构和性能进行了研究。结果表明:经不同形式致密化处理后,废旧纺织品中PET的特性黏数([η])降低,PET大分子均发生了热降解,其中团粒料伴随有明显的水解,而经半熔融致密化处理后废旧PET中副反应产物最少,不同致密化处理原料的再生PET切片的性能不同,其中以半熔融致密料为原料所得再生PET切片的[η]相对较高,[η]达0.699 d L/g,相对分子质量分布较窄,其相对分子质量分布指数为1.63,端羧基含量为33.29 mol/t,二甘醇质量分数为1.70%,热稳定性能较好。Post-consumer polyester（ PET） fabric was exposed to densification to produce three kinds of densified material,namely semi-melt densified material,melt extrusion material and granular material. The post-consumer PET fabric and the densified material were subjected to alcoholysis and re-polymerization to produce recycled PET chip under the same process conditions.The structure and properties of post-consumer PET fabric,densified material and recycled PET chip were studied. The results showed that the intrinsic viscosity（ [η]） of PET in post-consumer fabric rose,the thermal degradation of PET macromolecules occurred,and obvious alcoholysis reactions proceeded in granular material after different densification treatment; the semi-melt densification provided least by-products; different densification techniques contributed different properties to recycled PET chip;and the recycled PET chip made from semi-melt densified material had higher [η] up to 0. 699 d L / g,narrower relative molecular mass distribution of 1. 63,terminal carboxyl group content 33. 29 mol / t,lower diethylene glycol mass fraction of 1. 70% and better thermal stability.

关 键 词：聚对苯二甲酸乙二醇酯 废旧纺织品 致密化 邻甲酚不溶物 再生聚酯 结构 性能 

分 类 号：O633.14[理学—高分子化学]