Jia Peng, Ji Xiaoqian, Zheng Bin, Wang Chunyang, Hao Wenjie, Han Wenjia, Zhang Jun, Xia Guangmei, Ji Xingxiang, Zhang Jinming
State Key Laboratory of Biobased Material and Green Papermaking, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China.
Polymers (Basel). 2022 Apr 13;14(8):1589. doi: 10.3390/polym14081589.
Disposable paper cups are widely used in daily life and most of them are landfilled or incinerated after use, resulting in a serious ecological hazard and significant waste of resources due to the usage of thin polyethylene (PE) as their inner coating. Hence, converting these common solid domestic wastes into high-value added materials is attractive and meaningful. In this study, transparent cellulose-based films were achieved from old bamboo-based disposable paper cups after pretreatment through using the room ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl) as solvent. The cellulose-based film with a dense texture demonstrated a relatively nice mechanical and UV-shielding performances, and its tensile strength was as high as 48 MPa, much higher than that of commercial polyethylene (PE, 12 MPa) film. Thus, the resultant cellulose-based film showed a great potential in the packaging field. Besides, the flexible paper plastic composites (PPC) were also fabricated from the rest thin PE coating with the stuck fibers, and it was found that PPC showed excellent mechanical property and hydrophobicity. Consequently, a feasible and eco-friendly process of recycling and reusing waste disposable paper cups was developed to achieve a complete utilization and valorization of waste disposable paper cups.
一次性纸杯在日常生活中广泛使用，大多数纸杯使用后被填埋或焚烧，由于其内部涂层使用了薄聚乙烯（PE），造成了严重的生态危害和资源的大量浪费。因此，将这些常见的家庭固体废弃物转化为高附加值材料既具有吸引力又有意义。在本研究中，通过使用室温离子液体1-烯丙基-3-甲基咪唑氯盐（AmimCl）作为溶剂，对废弃竹制一次性纸杯进行预处理后，制备出了透明的纤维素基薄膜。具有致密质地的纤维素基薄膜表现出较好的机械性能和紫外线屏蔽性能，其拉伸强度高达48 MPa，远高于商业聚乙烯（PE，12 MPa）薄膜。因此，所得纤维素基薄膜在包装领域具有巨大潜力。此外，还利用剩余的带有黏附纤维的薄PE涂层制备了柔性纸塑复合材料（PPC），发现PPC具有优异的机械性能和疏水性。因此，开发了一种可行且环保的废弃一次性纸杯回收再利用工艺，以实现废弃一次性纸杯的完全利用和增值。
