Characterization of adhesive content in post-consumer poly(ethylene terephthalate) bottles and assessment of its impact on poly(ethylene terephthalate) recyclability

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, COMPOSITES

Progress in Rubber Plastics and Recycling Technology Pub Date : 2023-01-17 DOI:10.1177/14777606231152507

S. M. Silva, E. Medeiros, Luciana S. Galvão, Amélia S F Santos

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Abstract

Although the consequences of adhesive residues from post-consumer Poly(ethylene terephthalate) (PET) beverage bottles on the performance of recycled products are known, the quantitative effects of these adhesives are not well-stablished in the literature. Therefore, these residues were determined by gravimetry, and the adhesive content range from 200 to 2800 ppm in post-consumer PET bottles, depending on the drink filled. Through FTIR analysis, it was determined that the adhesives for bottles labelling are composed by poly(ethylene-co-vinyl acetate) (EVA). Based on these results, recycled PET with 0, 200, 700, 1500 and 3000 ppm of hot-melt EVA were processed in an internal mixer connected to a torque rheometer at 265°C for 10 min. Tensile tests indicate that 200 ppm of adhesive reduced PET tensile strength by 15%. Furthermore, when about 1500 ppm of adhesive is present, PET mechanical properties are reduced by 50%. Therefore, it is of utmost importance to warn the PET bottle production chain to reduce adhesive content used in labelling so that it should not exceed 200 ppm, if a high quality recycled PET is desirable. Graphical Abstract

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消费后聚对苯二甲酸乙酯瓶中粘合剂含量的表征及其对聚对苯二甲酸乙酯可回收性的影响评估

虽然消费后的聚对苯二甲酸乙酯(PET)饮料瓶的粘合剂残留物对回收产品性能的影响是已知的，但这些粘合剂的定量影响在文献中并没有很好地建立。因此，这些残留物是用重量法测定的，在消费后的PET瓶中，粘合剂的含量范围从200到2800 ppm，取决于所灌装的饮料。通过红外光谱分析，确定了用于瓶标的胶粘剂是由聚乙烯-醋酸乙烯酯(EVA)组成的。在此基础上，将含有0、200、700、1500和3000 ppm热熔EVA的回收PET在265°C的内部混炼机中与扭矩流变仪连接处理10分钟。拉伸测试表明，200 ppm的粘合剂使PET的拉伸强度降低了15%。此外，当约1500ppm的粘合剂存在时，PET的机械性能降低50%。因此，如果需要高质量的再生PET，警告PET瓶生产链减少标签中使用的粘合剂含量，使其不超过200 ppm是至关重要的。图形抽象

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来源期刊

Progress in Rubber Plastics and Recycling Technology MATERIALS SCIENCE, COMPOSITES-POLYMER SCIENCE

CiteScore

4.40

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： The journal aims to bridge the gap between research and development and the practical and commercial applications of polymers in a wide range of uses. Current developments and likely future trends are reviewed across key areas of the polymer industry, together with existing and potential opportunities for the innovative use of plastic and rubber products.