利用废弃聚对苯二甲酸乙二醇酯制备共聚酯PBCAT  

Preparation of Co-Polyester PBCAT fromWaste Polyethylene Terephthalate

作　　者：王婧茹 严娟 许铭育 郭国民 魏锋 王应民 武建勋[1] Jingru Wang;Juan Yan;Mingyu Xu;Guomin Guo;Feng Wei;Yingmin Wang;Jianxun Wu(State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute of Sichuan University,Chengdu 610065,China;Anhui Higasket Plastics Co.,Ltd.,Hefei 230601,China)

机构地区：[1]高分子材料工程国家重点实验室四川大学高分子研究所,四川成都610065 [2]安徽万朗磁塑股份有限公司,安徽合肥230601

出　　处：《高分子材料科学与工程》2024年第9期9-18,共10页Polymer Materials Science & Engineering

基　　金：安徽省科技重大专项(202203a05020020)。

摘　　要：聚对苯二甲酸乙二醇酯(PET)凭借其优异的综合性能被广泛用于包装行业,但PET在自然条件下难以降解,极易造成环境污染。为缓解该问题,文中对废弃PET进行解聚回收并将产物转化为新型可生物降解共聚酯。首先确定了以丁二醇(1,4-BDO)为醇解剂的最佳醇解条件,PET的解聚率可达99%,醇解产物的实际产率可达理论产率的80%。借助红外光谱、核磁共振及液相-质谱联用仪(LC-MS)等,证明醇解产物主要是对苯二甲酸丁二醇酯及少量的二聚、三聚体(记为BHBT)。分别以醇解产物BHBT及对苯二甲酸(PTA)为原料制备了新型共聚酯——聚对苯二甲酸己二酸-丁二醇环己烷二甲醇酯(分别记为rPBCAT和PBCAT);分析对比了rPBCAT和PBCAT的结构及性能,发现BHBT可以替代PTA参与共聚反应,rPBCAT具有与PBCAT相同的化学结构,rPBCAT具有同样优良的热性能和力学性能,其T-5%为344.2℃,拉伸强度为9.98 MPa,断裂伸长率达726.7%。综上表明,废弃PET可成功回收并转化为高附加值的新型共聚酯,为解决非降解型聚酯的白色污染提供了新途径,具有显著的经济和社会价值。Polyethylene terephthalate(PET)is widely used in packaging industry due to its excellent comprehensive performance.But PET is difficult to degrade under natural conditions and is highly susceptible to environmental pollution.To alleviate the problems,waste PET was depolymerized and recycled,and the product was transformed into a new biodegradable copolyester.Firstly,the optimal alcoholysis conditions were determined with butanediol(1,4-BDO)as alcoholysis agent,and the depolymerization rate of PET could reach 99%,and the actual yield of the alcoholysis product could reach 80%of the theoretical yield.Through FT-IR,1H-NMR and liquid chromatography-mass spectrometry(LC-MS),it is proved that the alcoholysis products are mainly butylene terephthalate and a small amount of dimer and trimer(denoted as BHBT).Novel copolyesters,poly(terephthalic acid adipate-butylene glycol cyclohexane dimethanol ester),were prepared from the alcoholysis product BHBT as well as terephthalic acid(PTA),respectively(denoted as rPBCAT and PBCAT,respectively).The structures and properties of rPBCAT and PBCAT were analyzed and compared,and it is found that BHBT could replace PTA to participate in copolymerization reaction.rPBCAT has the same chemical structure as PBCAT,and rPBCAT has the same excellent thermal and mechanical properties,with a T-5%of 344.2℃,a tensile strength of 9.98 MPa,and an elongation at break of 726.7%.In conclusion,it is shown that the waste PET can be successfully recycled and converted into a new type of co-polyester with high added value,which provides a new way to solve the white pollution of non-degradable polyester and has obvious economic and social value.

关 键 词：聚对苯二甲酸乙二醇酯 二元醇解聚 可降解共聚酯 回收再利用 

分 类 号：X705[环境科学与工程—环境工程]