首页|物理回收下再生聚对苯二甲酸乙二醇酯的物理表征及挥发性有机化合物监测

物理回收下再生聚对苯二甲酸乙二醇酯的物理表征及挥发性有机化合物监测

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  • 国家科技期刊平台
  • NETL
  • NSTL
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对物理回收工艺过程中的回收聚对苯二甲酸乙二醇酯(recycled polyethylene terephthalate,rPET)材料以及制成不同回收料含量的rPET瓶进行相关物理表征和挥发性有机化合物(volatile organic compounds,VOCs)监测,旨在追踪溯源和评估其作为食品接触用的安全性.研究发现,rPET与原生PET存在相似的热稳定性,rPET瓶并未产生基团和结构上的明显变化且表现出与原生PET瓶相似的结晶、熔融行为.但rPET瓶的表面微观形貌存在着细微的机械划伤,且随着回收料含量的增加,rPET瓶的颜色变得更深、更绿和更黄.运用顶空-气相色谱-质谱联用法检测VOCs,发现固相缩聚工艺对VOCs的去除起重要作用,使得rPET中VOCs的残留很少.在rPET瓶中检出4种VOCs(乙醛、乙二醇、壬醛均小于1.00mg/kg;2-甲基-1,3-二氧戊环为1.72～5.76mg/kg).研究表明rPET瓶虽然在颜色上存在差异,但在热性能、结构、形貌及VOCs残留等方面,具备了再次用于食品接触的条件.
Physical Characterization and Volatile Organic Compound Monitoring of Recycled Polyethylene Terephthalate under Mechanical Recycling
In this study,physical characterization and monitoring of volatile organic compounds(VOCs)were investigated on recycled polyethylene terephthalate(rPET)from a mechanical recycling process and rPET bottles made with different rPET contents,with the aim of tracing the source of rPET and assessing its safety when use as a food contact material.It was found that rPET had a similar thermal stability to that of virgin PET(vPET).rPET bottles did not show any significant changes in groups or structure and exhibit similar crystallization and melting behaviors to vPET.However,there were minor mechanical scratches in the surface micromorphology of rPET bottles,and the color of rPET bottles became darker,greener and yellower as the content of recycled material increased.The solid-state polycondensation process was found to play an important role in the removal of VOCs,as detected by headspace gas chromatography-mass spectrometry(HS-GC-MS),resulting in a very small amount of residual VOCs in rPET.Four VOCs(acetaldehyde,glycol and nonanal at levels less than 1.00 mg/kg;2-methyl-1,3 dioxolane at levels of 1.72-5.76 mg/kg)were detected in the rPET bottles.This study shows that rPET bottles are qualified for reuse in food contact in terms of thermal properties,structure,morphology and VOC residues,although there is variability in color.

mechanical recyclingrecycled polyethylene terephthalatephysical characterizationvolatile organic compoundsfood contact materials

曾严、金莉莉、朱蕾、吴永宁、罗世鹏、商贵芹、王志伟、刘桂华、胡长鹰

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暨南大学理工学院食品科学与工程系,广东广州 510632

常州工业及消费品检验有限公司,江苏常州 213017

国家食品安全风险评估中心,北京 100022

南京海关危险货物与包装检测中心,江苏常州 213000

暨南大学包装工程学院,广东珠海 519070

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物理回收 回收聚对苯二甲酸乙二醇酯 物理表征 挥发性有机化合物 食品接触材料

国家自然科学基金国际(地区)合作与交流项目江苏省自然科学基金青年基金

32061160474BK20201109

2023

10.7506/spkx1002-6630-20221011-100

食品科学
北京食品科学研究院

食品科学

CSTPCDCSCD北大核心
影响因子：1.327
ISSN：1002-6630
年,卷(期)：2023.44(24)
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