废弃EVA交联发泡物料的力化学解交联

Mechanochemistry Decrosslinking of Waste Crosslinked Blown EVA

通过溶胶凝胶、力学性能、红外光谱(FT-IR)和扫描电镜(SEM)研究了废弃固态多相多组分乙烯-乙酸乙烯酯共聚物(EVA)交联发泡物料在HAAKE流变仪中的解交联,以及力化学作用时间和温度对解交联的影响。结果表明,160℃~170℃时最佳解交联时间为24 min^28 min,力化学解交联使物料的拉伸强度由未经过解交联的7.5 MPa提高到11.5 MPa,提高了53%,使废弃EVA交联发泡物料网络体型结构发生断裂或生成小分子,其流动性能得到改善,使解交联后物料表面的亚微形态更光滑,相界面结合良好,是其资源化再生循环利用的新技术、新方法。

The decrosslinking of waste solid state multiphase and multicomponent crosslinked blown ethylene-vinyl acetate copolymer （EVA） in HAAKE rheometer was investigated. Effects of mechanochemistry decrosslinking time and temperature were studied by analyzing sol and gel contents, analyzing mechanical properties of the decrosslinked material, Fourier transform infrared spectroscopy and scanning electron microscopy. The results show that the optimum decrosslinking time is 24 min- 28 min. Mechanochemistry decrosslinking makes tensile strength of decrosslinked material improved by 53%, reaching 11.5 MPa from 7.5 MPa. The rupture of the net and stereostructural waste crosslinked blown EVA also results from mechanochemistry decrosslinking, and then some small molecules are generated to improve the plastic flow properties. Consequently, the surface morphology of the decrosslinked material is smooth, and its phase adhesive is good enough.