废弃PET化学回收及制备不饱和聚酯树脂的研究进展  

Progress in chemical recycling of waste PET and preparation of unsaturated polyester resins

作　　者：李志斌 唐辉[1] 罗大伟 应俏 LI Zhibin;TANG Hui;LUO Dawei;YING Qiao(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650504,Yunnan,China;Natural Science Office,Louangnamtha Teacher Training College,Louangnamtha 03000,Louangnamtha,Laos)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650504 [2]老挝南塔师范学院自然科学部,南塔南塔03000

出　　处：《化工进展》2022年第6期3279-3292,共14页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金地区基金(51167008);校企合作科技基金(kkk0201705038)。

摘　　要：随着聚对苯二甲酸乙二醇酯(PET)材料用量的大幅增长,大量废弃PET制品堆积造成的环境污染问题日益突出,其回收利用技术也随之广受关注。在不同的PET回收方法中,将PET降解为单体或低聚物的化学回收是效率最高、产物利用价值最大的方法,但也存在反应条件苛刻、产物收率低等问题。本文详细梳理了水解法、甲醇醇解法、二元醇醇解法、胺解法和氨解法等化学回收方法的主要特点以及微波加热、离子液体、纳米技术等新兴技术在PET化学回收过程中的应用概况。通过对各种化学回收工艺的比较,文中得出二元醇醇解法是最具商业应用价值方法的结论。在此基础上,文中重点介绍了PET的二元醇解以及进一步制备不饱和聚酯树脂的化学过程、发展现状、制约因素和改进措施。分析表明,由PET二元醇解产物制备不饱和聚酯树脂是提高废弃PET资源化效率、丰富原料供给、推动产品升级的重要途径,开发高效、廉价、环保的新型催化剂或酶催化技术是废弃PET回收领域今后主要的发展方向。With the substantial increase of polyethylene terephthalate(PET) material consumption, the environmental pollution caused by the accumulation of a large number of waste PET products has become increasingly prominent, and its recycling technology has also received widespread attention. Among different PET recovery methods, the chemical recycling of degrading PET into monomers or oligomers is the most efficient and most valuable method for product utilization. However, there are also problems such as harsh reaction conditions and low product yields. This review combs the main characteristics of the chemical recycling methods such as hydrolysis, methanolysis, glycolysis, aminolysis and ammonolysis.Meanwhile, the applications of emerging technologies such as microwave heating, ionic liquids and nanotechnology in the chemical recycling of PET are also introduced. Through the comparison of various chemical recycling processes, it is concluded that glycolysis is the most valuable method for commercial application. On this basis, the focus is on the chemical processes, development status, restricting factors and improvement measures of the glycolysis of PET and the further preparation of unsaturated polyester resins. The analysis shows that the preparation of unsaturated polyester resins from PET glycolysis products is an important way to improve the resource efficiency of waste PET, enrich the supply of raw materials and promote product upgrades. The development of high-efficiency, low-cost and environmentally friendly new catalysts or enzyme catalysis is the main development direction in the field of waste PET recycling in the future.

关 键 词：聚对苯二甲酸乙二醇酯 回收 降解 二元醇解 制备 不饱和聚酯树脂 化学过程 

分 类 号：TQ322.3[化学工程—合成树脂塑料工业]