不同形态聚对苯二甲酸乙二醇酯对醇解效率的影响  

Effect of Different Forms of Polyethylene Terephthalate on Performance of Glycolysis

作　　者：雷丹丹 曹长林[2] 孙晓丽 陈庆华[2] 胡莎莎 区菊花 肖荔人[1,2] 黄宝铨 Dandan Lei;Changlin Cao;Xiaoli Sun;Qinghua Chen;Shasha Hu;Juhua Ou;Liren Xiao;Baoquan Huang(College of Chemistry and Materials,Fujian Normal University,Fuzhou 350007,China;Engineering Research Center of Polymer Green Recycling,Ministry of Education,Fuzhou 350007,China;Institute of Resources Utilization and Rare Earth Development,Guangdong Academy of Sciences,Guangzhou 510650,China)

机构地区：[1]福建师范大学化学与材料学院,福建福州350007 [2]聚合物资源绿色循环利用教育部工程研究中心,福建福州350007 [3]广东省科学院资源利用与稀土开发研究所,广东广州510650

出　　处：《高分子材料科学与工程》2022年第6期96-102,共7页Polymer Materials Science & Engineering

基　　金：2019年国家重点研发计划重点专项(2019YFC1904500);2021年福建省科技计划工业引导性(重点)项目(2021H0016);2021年福州市科技计划(2021-P-038)。

摘　　要：以二甘醇(DEG)为醇解剂、无水氯化亚锡(SnCl2)为催化剂,采用一步进料和分步进料醇解法,研究了聚对苯二甲酸乙二醇酯(PET)瓶片、PET粒料和PET纤维的醇解反应。通过扫描电镜、差示扫描量热分析、热重分析、红外光谱、核磁共振等方法表征了不同形态PET材料及其醇解产物的结构与热性能。结果表明,PET材料化学结构不会因为它的形态发生变化,但熔点和结晶度有明显的不同,其中PET纤维的熔点(253℃)和结晶度(43.44%)均高于PET瓶片和PET粒料。当醇解温度为220℃、反应为180 min时,一步进料醇解法的PET材料的醇解率依次为瓶片粒料纤维(依次为98.8%,98.8%,80.8%);当醇解温度为220℃、反应时间为90 min时,分步进料醇解法的PET瓶片和粒料的醇解率均达到100%、纤维的醇解率达到92.5%;一步进料醇解法的醇解率依次为瓶片42.1%、粒料38.5%、纤维28.0%,分别提高了57.9%,61.5%和64.5%。文中研发的分步进料醇解法技术可以使PET材料醇解反应时间缩短1/2,且PET纤维的醇解率有明显提升。The glycolysis reactions of polyethylene terephthalate(PET)bottle,PET particle and PET fibers were investigated using diethylene glycol(DEG)and SnClas catalyst by one-step feed and stepwise feeding process.The structural and thermal properties of the PET materials and their glycolysis products were characterised by SEM,DSC,TG,FT-IR,~1H-NMR and other analytical means.The results show that the chemical structures of the three different forms of PET materials were similar with no significant changes.The melting point(253℃)and crystallinity(43.44%)of the PET fibers are higher than those of the PET bottle and PET particle.When the glycolysis temperature is 220℃and the reaction time is 180 min,the conversion ratio of PET materials by one-step feeding process is bottle reaction time is 90 min,the conversion ratio of PET bottle and particle by stepwise feeding process reaches 100%,and the conversion ratio of fibers reaches 92.5%.The conversion ratio of one-step feeding process is 42.1%for bottle,38.5%for particle and 28.0%for fibers,which is increased by 57.9%,61.5%and 64.5%,respectively.The results show that the stepwise feeding process can reduce the glycolysis time of PET material by half,and the conversion ratio of PET fibers can be significantly improved.

关 键 词：醇解 聚对苯二甲酸乙二醇酯瓶片 聚对苯二甲酸乙二醇酯粒料 聚对苯二甲酸乙二醇酯纤维 结晶度 

分 类 号：TQ342.21[化学工程—化纤工业]