乙烯-乙酸乙烯酯橡胶/纳米蒙脱土复合发泡材料的制备和性能

Preparation and Characterization of Ethylene Vinyl Acetate Rubber/Montmorillonite Foamed Nanocomposites

以高乙酸乙烯酯(VA)含量的乙烯-乙酸乙烯酯橡胶(EVM)为主基体、1,4-双叔丁基过氧异丙基苯(BIPB)为交联剂、偶氮二甲酰胺(AC)为发泡剂,通过模压法制备了EVM及其与蒙脱土的纳米复合发泡材料;系统研究了蒙脱土的种类和含量对EVM复合发泡材料硫化发泡性能、力学和耐热性能的影响。结果表明,加入经过有机改性后的蒙脱土能有效提高材料的发泡倍率和耐热性能,并可降低材料的密度;纳米蒙脱土能够延长胶料的正硫化时间,加入1phr的有机改性蒙脱土(OMMT)后,胶料的正硫化时间延长了1min;纳米蒙脱土的加入提高了EVM发泡材料的力学性能和压缩永久变形率,且在OMMT含量为6phr时复合材料的拉伸强度、撕裂强度和冲击回弹率达到最大值。

Ethylene vinyl acetate rubber(EVM)/montmorillonite(MMT)foamed composites were prepared by compression molding,with EVM as matrix,BIPB as crosslinker and AC as foamer.The effects of MMT content and variety on the properties of vulcanization and foam,mechanical and thermal stability of EVM foamed nanocomposites were systematically investigated.The results show that the addition of organically modified montmorillonite(OMMT)can improve foaming ratio and heat resistance.The bulk density of EVM/OMMT composite decreases,and the vulcanizing time of composite increases by 1min after blending with 1phr OMMT.The mechanical properties of material increase and compression set decreases.The values of tensile strength,tearing strength and impact resilience reach to the maximum when 6phr OMMT is added.