Guo Lei, Wang Wenchao, Guo Xiurui, Hao Kuanfa, Liu Haichao, Xu Yuan, Liu Gongxu, Guo Shouyun, Bai Lichen, Ren Donghui, Liu Fumin
College of Electromechanical Engineering, Qingdao University of Science & Technology, Qingdao 266061, China.
National Engineering Laboratory of Advanced Tire Equipment and Key Materials, Qingdao University of Science & Technology, Qingdao 266061, China.
Materials (Basel). 2022 Sep 1;15(17):6047. doi: 10.3390/ma15176047.
In the context of protecting the ecological environment and carbon neutrality, high-value recycling of flexible polyurethane foam (F-PUF) scraps, generated in the production process, is of great significance to save petroleum raw materials and reduce energy consumption. In the present study, F-PUF scraps were ground into powder by strong shear regrinding using two-roll mill and then reused as a partial replacement of polyol for re-foaming. A series of characterizations were employed to investigate the effect of milling cycles, roller temperatures, and content of the powder on the properties of the powder and F-PUF containing powder. It was revealed that the mechanochemical effect induced breaking of the cross-linking structure and increased activity of the powder. The volume mean diameter (VMD) of powder prepared with 7 milling cycles, at room temperature, is about 97.73 μm. The microstructure and density of the F-PUF containing powder prepared in the above-mentioned manner to replace up to 15 wt.% polyol, is similar to the original F-PUF, with resilience 49.08% and compression set 7.8%, which indicates that the recycling method will play an important role in industrial applications.
在保护生态环境和碳中和的背景下，生产过程中产生的柔性聚氨酯泡沫（F-PUF）废料的高值回收，对于节省石油原料和降低能源消耗具有重要意义。在本研究中，通过双辊研磨机的强剪切再研磨将F-PUF废料磨成粉末，然后将其作为多元醇的部分替代品用于重新发泡。采用一系列表征手段来研究研磨循环次数、辊筒温度和粉末含量对粉末及含粉末F-PUF性能的影响。结果表明，机械化学效应导致交联结构断裂并提高了粉末的活性。在室温下经过7次研磨循环制备的粉末的体积平均直径（VMD）约为97.73μm。以上述方式制备的含粉末F-PUF，当替代多元醇的比例高达15 wt.%时，其微观结构和密度与原始F-PUF相似，回弹率为49.08%，压缩永久变形率为7.8%，这表明该回收方法将在工业应用中发挥重要作用。
