Song Wenmin, Yang Yuncong, Cheng Xiuwen, Jiang Mingming, Zhang Rui, Militky Jiri, Cai Yurong
The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, National Engineering Lab for Textile Fiber Materials and Processing Technology, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, People's Republic of China.
R&D Department, NMG Composites Co. Ltd., Tongxiang, Zhejiang, China.
Microsc Res Tech. 2023 Nov;86(11):1475-1483. doi: 10.1002/jemt.24367. Epub 2023 Jul 17.
Biomass-derived wastes as the additive of nondegradable plastics have been paid more attention due to the ever-growing environmental pollution and energy crisis. Herein, the spent coffee grounds (SCG) have been used as fillers in polypropylene (PP) after the heat treatment to realize its recycling utilization. The effect of the heat treatment atmosphere on the properties of the obtained SCG and SCG/PP composites has been investigated systematically. The results show that the residual coffee oil can be removed more thoroughly under an air atmosphere than under a nitrogen atmosphere at a relatively low cost and an eco-friendly process. The lower residual oil rate of SCG is beneficial to improve the comminution and further enhance the affinity with the PP matrix. The obtained SCG/PP composites hold lower water absorption, higher hydrophobicity, and better mechanical properties, implying their potential applications in the field of food packaging. RESEARCH HIGHLIGHTS: Spent coffee grounds have been used as fillers in PP after the heat treatment. The heat treatment in the air is more favorable for the removal of the coffer oil of SCG. The low residual oil rate in SCG can improve its comminution and affinity with PP. The SCG/PP composites hold excellent performances for food packaging applications.
由于环境污染和能源危机日益严重，生物质衍生废物作为不可降解塑料的添加剂受到了更多关注。在此，经过热处理后的废弃咖啡渣（SCG）被用作聚丙烯（PP）的填料，以实现其回收利用。系统研究了热处理气氛对所得SCG及SCG/PP复合材料性能的影响。结果表明，在空气气氛下，残留咖啡油能以相对较低的成本和环保工艺比在氮气气氛下更彻底地去除。SCG较低的残留油率有利于改善其粉碎效果，并进一步增强与PP基体的亲和力。所得SCG/PP复合材料具有较低的吸水率、较高的疏水性和较好的力学性能，这意味着它们在食品包装领域具有潜在应用。研究亮点：热处理后的废弃咖啡渣被用作PP的填料。在空气中进行热处理更有利于去除SCG中的咖啡油。SCG中低残留油率可改善其粉碎效果及与PP的亲和力。SCG/PP复合材料在食品包装应用中具有优异性能。
