聚集态结构对PET纤维醇解过程和产物的影响  

Effect of aggregate structure on alcoholysis process and products of PET fiber

作　　者：于翔安 刘高喆 左伟伟[1] 孙俊芬[1] 陈龙[1] YU Xiangan;LIU Gaozhe;ZUO Weiwei;SUN Junfen;CHEN Long(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620)

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201620

出　　处：《合成纤维工业》2024年第4期8-15,共8页China Synthetic Fiber Industry

基　　金：国家重点研发计划项目(2020YFC1910300、2020YFC1910301)。

摘　　要：以乙二醇(EG)作为醇解试剂、醋酸锌(Zn(AC)_(2))作为催化剂,对聚对苯二甲酸乙二醇酯(PET)纤维进行醇解,研究了PET纤维的较佳醇解工艺;对不同聚集态结构的PET纤维进行表征并进行醇解实验,采用差示扫描量热仪、高效液相色谱-质谱联用仪、全数字化核磁共振波谱仪等对醇解过程及产物进行表征。结果表明:PET纤维的较佳醇解工艺为催化剂质量分数1.0%、搅拌转速300 r/min、反应温度190℃、EG与PET纤维质量比91;PET纤维的醇解转化率随纤维结晶度的提高而下降,而取向度对醇解率影响不大,反应过程中未醇解物主要为未醇解PET纤维、三聚体及二聚体,醇解主要产物为对苯二甲酸双羟乙酯,且不含其他杂质。The rational alcoholysis process of polyethylene terephthalate(PET)fibers was studied using ethylene glycol(EG)as alcoholysis reagent and zinc acetate(Zn(AC)_(2))as catalyst.The PET fibers with different aggregate structures were characterized and the alcoholysis experiments were conducted.The alcoholysis process and products were characterized by differential scanning calorimetry,high-performance liquid chromatography-mass spectrometry and fully digital nuclear magnetic resonance spectroscopy.The results showed that the rational alcoholysis process of PET fibers was as followed:1.0%catalyst by mass fraction,stirring speed 300 r/min,reaction temperature 190℃,mass ratio of EG to PET fiber 91;the alcoholysis conversion rate of PET fibers decreased with the increase of the crystallinity,while the degree of orientation had little effect on the alcoholysis rate;the non alcoholysis products were mainly composed of unalcoholized PET fibers,trimers and dimers during the reaction process,and the alcoholysis product was dihydroxyethyl terephthalate without any other impurities.

关 键 词：聚对苯二甲酸乙二酯纤维 结晶度 取向度 聚集态结构 醇解 

分 类 号：TQ342.21[化学工程—化纤工业]