Investigation in the pyrolysis of polyester coated on aluminum-based beverage: Thermodynamic properties, product and mechanism

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2024-11-24 DOI:10.1016/j.jaap.2024.106878

Zhen-Qiang Yu , Guo-Dong Hong , Wei Zhao , Dong Liang , Zhen Huang , Che Zhao , Rui Shan , Hao-Ran Yuan , Yong Chen

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Abstract

Aluminum cans are typical solid waste. Polyester coatings not only polluted the environment, but also affected the quality of aluminum recycling. In this study, three common local polyester coatings on the surface of aluminum cans were selected as raw materials (PC-PB, PC-VY and PC-SG). Thermogravimetric analysis, elemental analysis, Fourier transform infrared spectrometer and pyrolysis gas chromatography/mass spectrometry (PY-GC/MS) were used to study the pyrolysis behavior and pyrolysis products of the polymer components coated on the aluminum cans. TG analysis showed that pyrolysis of the coatings mainly occurred at 250–540 °C, with a weight loss of about 25 % for the polyester coating PC-PB and PC-VG, and a lower weight loss of 15 % for polyester coating PC-SY. The effect of pyrolysis temperature on the pyrolysis products of polyester coatings was investigated using PY-GC/MS. The results showed that the main products of pyrolysis included four major groups: oxygenated compounds, aromatic compounds, nitrogenous compounds and aliphatic hydrocarbons. At 600 °C, the aromatic compounds, oxide-containing reached 57–67 % and 20–27 %, respectively. The main pyrolysis products include neopentyl glycol, phthalic anhydride, toluene, styrene and so on. The high content of aromatic compounds in the product can be used as chemical raw materials as well as alternative fuels. In addition, the pyrolysis principles of the three main components of polyester coatings (polyester resins, amino resins, and styrene-acrylic resins) were postulated.

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铝基饮料包覆聚酯的热解研究：热力学性质、产物及机理

铝罐是典型的固体废物。聚酯涂料不仅污染环境，而且影响铝的回收质量。本研究选取铝罐表面常见的三种局部聚酯涂层（PC-PB、PC-VY和PC-SG）作为原料。采用热重分析、元素分析、傅里叶变换红外光谱仪和热解气相色谱/质谱（PY-GC/MS）等方法研究了涂覆在铝罐上的聚合物组分的热解行为和热解产物。TG分析表明，涂层的热解主要发生在250 ~ 540 ℃，聚酯涂层PC-PB和PC-VG的失重率约为25 %，聚酯涂层PC-SY的失重率较低，为15 %。采用PY-GC/MS研究了热解温度对聚酯涂料热解产物的影响。结果表明，热解产物主要有4大类：含氧化合物、芳香族化合物、含氮化合物和脂肪族烃。在600 ℃时，芳香族化合物的含氧率分别达到57 ~ 67 %和20 ~ 27 %。主要热解产物有新戊二醇、邻苯二酐、甲苯、苯乙烯等。产品中芳香族化合物含量高，可作为化工原料，也可作为替代燃料。此外，还对聚酯涂料的三种主要组分（聚酯树脂、氨基树脂和苯乙烯-丙烯酸树脂）的热解原理进行了假设。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.