固相剪切碾磨技术在废弃EVA基鞋底材料回收中的应用  

Application of Solid State Shearing Milling Technology in Recycling of Waste EVA Based Sole Materials

作　　者：刘兆港 郭武 刘鹏举[1,2] 李莉 LIU Zhaogang;GUO Wu;LIU Pengju;LI Li(State Key Laboratory of Polymer Materials Engineering,Sichuan University,Polymer Research Institute of Sichuan University,Chengdu,Sichuan 610065,China;Jiangsu JITRI Advanced Polymer Materials Research Institute Co.,Ltd.,Nanjing,Jiangsu 210043,China)

机构地区：[1]四川大学高分子材料工程国家重点实验室,四川大学高分子研究所,四川成都610065 [2]江苏集萃先进高分子材料研究所有限公司,江苏南京210043

出　　处：《塑料》2021年第6期1-5,10,共6页Plastics

基　　金：国家重点研发计划(2019YFC1904505)。

摘　　要：采用固相剪切碾磨技术制备了废弃EVA基鞋底(ESW)粉体,并将其与热塑性聚氨酯(TPU)进行共混复合,研究了碾磨次数对ESW表面物性、微观形貌的影响,以及TPU/ESW复合材料的力学性能。研究结果表明,经固相剪切碾磨后,ESW粉体逐渐变为细小的片状,平均粒径减小到406.2μm,同时其比表面积增大、粒度分布变宽。氨基、羰基等红外光谱特征吸收峰强度明显增加,粉体表面活性提升;醋酸乙烯酯侧基发生部分脱除,热分解峰变弱,并向高温方向偏移4.4℃。与未碾磨ESW相比,碾磨后的ESW粉体有效改善了TPU的力学性能,使复合材料的拉伸强度由4.7 MPa提升到8.5 MPa,断裂伸长率由721%提升到1369%,为废弃EVA基鞋底材料的回收利用提供新途径。Waste EVA based sole powders(ESW)were prepared by adopting solid state shearing milling technology,and then blended with TPU.The surface physical properties and micro morphology of ESW as well as the mechanical properties of TPU/ESW composite were studied.The results showed that after solid shear milling,the milled ESW powders gradually became fine flakes,and displayed a reduced volume median particle size to 406.2μm.At the same time,the specific surface area increased and the particle size distribution widened;the intensities of the characteristic adsorption peaks,such as amino group and carbonyl group,in FTIR obviously enhanced,indicating the improved surface activity;the side groups partially decomposed,leading to the weakened intensity and 4.4℃high-temperature shift of its thermal decomposition peak.Compared with the unmilled ESW,the milled ESW powders effectively improved the mechanical properties of TPU,i.e.the tensile strength increased from 4.7 MPa to 8.5 MPa,while the elongation at break increased from 749%to 1369%.This study provides a new way for the value-added recycle and ultilization of waste EVA based sole materials.

关 键 词：固相剪切碾磨 废弃EVA鞋底 聚氨酯 共混 回收 

分 类 号：TQ325.5[化学工程—合成树脂塑料工业] TQ323.8