乙二醇解聚废旧聚酯及其产物分析
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摘要
研究了乙二醇解聚废旧聚酯工艺,探索并明确了催化剂含量、废旧聚酯与乙二醇质量比、温度、时间等参数对非均相解聚效率的影响。试验结果表明:催化剂质量分数0.2%、废旧聚酯与乙二醇质量比1∶3、常压反应温度196℃、反应时间2 h为优化高效的醇解工艺,醇解率为100%,对苯二甲酸双羟乙酯(BHET)产率达到80%。研究了醇解主要产物中BHET与低聚物的分离纯化工艺,通过DSC/TGA、FTIR、NMR等测试手段对分离组分进行了分析表征。
The depolymerization technology of waste polyester(PET) by using ethylene glycol was studied, effects of weight ratio of PET to ethylene glycol, depolymerizing temperature, depolymerizing time and other parameters on non-homogeneous depolymerization rate were investigated. With a catalyst content as 0.2%,PET-to-EG ratio as 1∶3, reaction temperature as 196 ℃, reaction time as 2 h under normal pressure, an optical technology with a 100% depolymerization rate and 80% yield of bis(2-hydroxyethyl) terephthalate(BHET) was obtained. By separation and purification of glycolysis products to obtain oligomer and BHET,these two main components were characterised by methods of DSC/TGA, FTIR and NMR.
The depolymerization technology of waste polyester(PET) by using ethylene glycol was studied, effects of weight ratio of PET to ethylene glycol, depolymerizing temperature, depolymerizing time and other parameters on non-homogeneous depolymerization rate were investigated. With a catalyst content as 0.2%,PET-to-EG ratio as 1∶3, reaction temperature as 196 ℃, reaction time as 2 h under normal pressure, an optical technology with a 100% depolymerization rate and 80% yield of bis(2-hydroxyethyl) terephthalate(BHET) was obtained. By separation and purification of glycolysis products to obtain oligomer and BHET,these two main components were characterised by methods of DSC/TGA, FTIR and NMR.
引文
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[14]王爽.废旧聚酯纺织品的乙二醇醇解技术研究[D].上海:东华大学, 2017.
[2]刘宝玉,唐舫成,汪加胜,等.新型环氧扩链剂对回收PET性能的影响[J].塑料工业, 2013, 41(12):111-114.
[3] TIHOMIR Kovacevic, JELENA Rusmirovic, NATA?A Tomic, et al.New composites based on waste PET and non-metallic fraction from waste printed circuit boards:Mechanical and thermal properties[J]. Composites Part B:engineering, 2017, 127:1-14.
[4] SPASOJEVIC P M, PANIC V V, DZUNUZOVIC J, et al. High performance alkyd resins synthesized from postconsumer PET bottles[J]. RSC Advances, 2015, 5(76):62273-62283.
[5] SHEN L, WORRELL E, PATEL Martin K. Open-loop recycling:a LCA case study of PET bottle-to-fibre recycling[J]. Resources Conservation and Recycling, 2010, 55(1):34-52.
[6] FURUKAWA Y, TAKEDA T. Mechanical properties of liquefied stabilized soil mixed with short fibers reutilized waste PET bottles[J]. Journal of Japan Society of Civil Engineers Ser C, 2017, 73(2), 157-168.
[7]戴训霞,胡钢.聚酯回收技术及其回收产品应用进展[J].合成纤维,2007, 36(6):5-8.
[8] HEALTH R L. Recovery of terephthalic acid from polyestersFU:UK Patent, 610135, 1946[P].
[9] GUO ZR, XU Gui-Hong, FU Ruo-Wen, et al. Alcoholysis of waste PET and its application for the synthesis of unsaturated polyester resin[J].Thermosetting Resin, 2017, 32(6):39-44.
[10]刘立新,胡达,刘若望,等.聚对苯二甲酸乙二醇酯(PET)的解聚与反应机理研究[C]//中国功能材料及其应用学术会议. 2004:2576-2578.
[11]程为庄,张秀彩.废PET饮料瓶的醇解反应动力学[J].建筑材料学报. 2002(03):298-302.
[12]王红兴,孟家光,陈伟.醇碱联合法回收废旧纯涤纶纺织品技术[J].合成纤维, 2017, 46(7):27-29.
[13]祝根平,从废聚酯合成多组分共聚酯的研究[D].杭州:浙江大学,2004.
[14]王爽.废旧聚酯纺织品的乙二醇醇解技术研究[D].上海:东华大学, 2017.