超临界CO_(2)在废旧聚酯纺织品脱色中的性能研究

PERFORMANCE STUDY OF SUPERCRITICAL CARBON DIOXIDE IN DECOLORIZATION OF WASTE POLYESTER TEXTILES

聚对苯二甲酸乙二醇酯(PET)纺织品因其优异的性能受到青睐,已成为纺织面料的中流砥柱。为满足人类生产生活的需要,彩色聚酯纺织品的消费量是巨大的。废旧聚酯产品难以降解,对环境污染严重,但由于PET纺织品中含有染料等添加剂,使得PET纺织品再生利用率低。本研究将超临界CO_(2)引入原液着色聚酯脱色工作中,分别考察了N,N-二甲基甲酰胺(DMF)和二甲基亚砜(DMSO)在超临界CO_(2)下对原液着色PET织物的脱色性能。此外,还将超临界CO_(2)脱色与常规方式脱色进行比较。结果表明:DMF和DMSO在超临界CO_(2)条件下能充分发挥其脱色性能,并且DMF对聚酯的脱色效果优于DMSO。在脱色剂(DMF)、液比(1∶15)、处理时间(20 min)、温度(140℃)和压力(10 MPa)的优化组合下,PET织物具有良好的脱色效果。通过NMR、GPC、TG、DSC、XRD和醇解实验考察了超临界CO_(2)脱色后PET织物的性能。

Polyethylene terephthalate(PET)textiles are widely favored for their excellent performance and have become the mainstay of textile fabrics.In order to meet the needs of human production and life,the consumption of color polyester textiles is huge.The waste polyester products are difficult to degrade and pollute the environment,but the additives contained in PET textiles such as dyes make the recycling rate of PET textiles low.In this study,supercritical carbon dioxide was introduced into the decolorization of dope dyeing polyester,and the decolorization performance of N,N-dimethylformamide(DMF)and dimethyl sulfoxide(DMSO)on dope dyeing PET textiles under supercritical carbon dioxide was investigated,respectively.In addition,the decolorization by supercritical carbon dioxide was compared with that by conventional means.The results showed that DMF and DMSO could fully exploit their decolorization performance under supercritical CO_(2)conditions,and the decolorization effect of DMF on polyester was better than that of DMSO.good decolorization effect of PET fabrics was achieved under the optimized combination of decolorizing agent(DMF),liquid ratio(1∶15),treatment time(20 min),temperature(140℃)and pressure(10 MPa).The properties of PET fabrics after decolorization by supercritical CO_(2)were investigated by NMR,GPC,TG,DSC,XRD and alcoholysis experiments.