Abstract：
Due to the development of the food delivery industry, a large amount of waste lunchboxes made of homo polypropylene (PP) plastic have been generated. This study developed a new technological strategy to effectively regenerate PP from waste lunchboxes. Through response surface curve analysis, it was found that under the optimal process conditions of hot alkali washing at 80 ℃, 30 min, and pH 13, the optimal contact angle was 65.55°, indicating a good oil stain removal effect. By identifying and analyzing the characteristics of impurities in waste lunchboxes, a physical sorting and granulation regeneration process was constructed. And through large-scale statistical analysis and data collection, it was further verified that recycled PP plastics maintained their physical stability and excellent processing performance. The quality stability of recycled PP plastics in terms of impurities content was also verified. By designing different formulations specifically, recycled PP was mixed with different virgin PP and antioxidants in appropriate proportions, and extruded into particles under 150-300 mesh filtration conditions to obtain modified recycled PP. Modified recycled PP was applied in textiles, clothing, and injection molded products. In conclusion, we achieve the up-cylcing of waste PP lunchboxes instead of down-cylcing.
摘要：
由于食品配送行业的发展，产生了大量由均聚聚丙烯(PP)塑料制成的废午餐盒。这项研究开发了一种新的技术策略，可以有效地从废午餐盒中再生PP。通过响应面曲线分析,发现在80℃热碱洗涤的最佳工艺条件下,30分钟,和pH值13，最佳接触角为65.55°，说明油污去除效果好。通过识别和分析废饭盒中杂质的特性,构建了物理分选和造粒再生过程。并通过大规模的统计分析和数据收集,进一步验证了再生PP塑料保持了其物理稳定性和优异的加工性能。还验证了再生PP塑料在杂质含量方面的质量稳定性。通过专门设计不同的配方，再生PP与不同的原始PP和抗氧化剂以适当的比例混合，并在150-300目过滤条件下挤出成颗粒，得到改性再生PP。改性再生PP在纺织品中的应用，服装,和注塑产品。总之,我们实现了废PP午餐盒的向上循环，而不是向下循环。
