目的 针对再生塑料应用范围受限,附加价值低的现状,探究再生塑料在重载包装膜中的应用,开发从薄膜到薄膜的闭合循环路径。方法 将工业生产中的重载包装膜边角料和使用后的废弃膜袋回收,制备成再生聚乙烯（Recycled polyethylene,rPE）塑料粒子,并将其成功地应用在重载包装膜的配方中,制备含有质量分数分别为20%、51.8%、70% rPE的重载包装膜,并与新料薄膜（0%rPE）进行对比,分析再生塑料的加入对重载包装膜性能的影响。结果 随着再生塑料含量的上升,薄膜的热力学性能、雾度、抗撕裂性能、断裂伸长率、屈服应力和热封强度会下降,而熔融指数、拉伸性能、抗冲击性能和老化性能则在rPE含量处于中下水平（20%、51.8%rPE）时表现良好,优于新料薄膜。结论 适量添加再生塑料（20%rPE）对薄膜部分力学性能有积极作用,但添加高比例的再生塑料（70%rPE）会导致薄膜性能的急剧下降,因此适当地提升薄膜中rPE的含量可以改善薄膜的加工性能,增加膜泡稳定性,提升薄膜的均一性。再生聚乙烯在重载包装膜中的应用,为再生塑料的高值化利用提供了新场景。
Abstract
Specific to the current situation where recycled plastics have limited application scope and low added value, the work aims to explore the application of recycled plastics in heavy duty packaging films and develop a closed-loop recycling pathway among films. Heavy duty packaging film trimmings from industrial production and discarded film bags after use were recycled to prepare recycled polyethylene (rPE) plastic pellets. These pellets were successfully incorporated into the formulation of heavy duty packaging films to produce films containing 20%, 51.8%, and 70% rPE. These films were compared with virgin material films (0% rPE) to analyze the impact of recycled plastics on the performance of heavy duty packaging films. As the content of recycled plastics increased, the thermodynamic properties, haze, tear resistance, elongation at break, yield stress, and heat-sealing strength of the films decreased. However, the melt index, tensile properties, impact resistance, and aging properties performed well when the rPE content in the films was at medium-to-low levels (20%, 51.8% rPE), outperforming virgin material films. Moderate addition of recycled plastics (20% rPE) has a positive effect on some mechanical properties of the film, while high-proportion addition (70% rPE) leads to a sharp decline in film performance. Therefore, appropriately increasing the rPE content in the film can improve processing performance, enhance bubble stability, and boost film uniformity. The application of recycled polyethylene in heavy duty packaging films not only provides a new scenario for the high-value utilization of recycled plastics.
关键词
再生聚乙烯 /
重载包装膜 /
塑料循环
Key words
recycled polyethylene (rPE) /
heavy duty packaging film /
plastic circularity
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