硫化体系对氯化丁基橡胶/尼龙12动态硫化胶性能的影响

研究了氧化锌、N,N’-间苯撑双马来酰亚胺(HVA-2)/氧化锌和1,3-双柠糠酰亚胺甲基苯(PK 900)/氧化锌3种硫化体系下氯化丁基橡胶(CIIR)/尼龙(PA)12混炼胶的硫化特性及CIIR/PA 12动态硫化胶(TPV)的物理机械性能和微观相结构,并考察了PK 900与氧化锌不同配比对CIIR/PA 12TPV物理机械性能、流变性能及微观相结构的影响。结果表明,PK 900/氧化锌的硫化速率介于氧化锌和HVA-2/氧化锌两者之间,由其制备的TPV橡胶相粒径为1～2μm,均匀分布在树脂相中,物理机械性能最优;固定PK 900用量为3份时,随着氧化锌用量的减少,CIIR/PA 12 TPV的拉伸强度、扯断伸长率和100%定伸应力均呈现先增大后减小的趋势;当PK 900/氧化锌(质量比)为3/5时,CIIR/PA 12TPV的物理机械性能最佳,且呈现低剪切速率高黏度、高剪切速率低黏度的特性。

Effect of curing systems on properties of chlorinated butyl rubber/nylon 12 dynamic vulcanizates

The curing characteristics of chlorinated butyl rubber(CIIR)/nylon 12(PA 12) compounds and mechanical properties,microphase structure of CIIR/PA 12 dynamic vulcanizates(TPV) were studied with zinc oxide(ZnO),HVA-2/ZnO and PK 900/ZnO as curing system respectively,and effects of mass ratio of PK 900 to ZnO on mechanical properties,rheological properties and microphase structure of CIIR/PA 12 TPV were investigated.The results showed that curing rate of PK 900/ZnO was between those of ZnO and HVA-2/ZnO,the rubber phase particles in TPV cured with PK 900/ZnO was 1-2 μm in size and distributed uniformly in plastic phase,so that the mechanical properties of the TPV was best.With increasing amount of ZnO,the tensile strength,elongation at break and modulus at 100% of the TPV with 3 phr of PK 900 increased first and then decreased.The mechanical properties of TPV was best when amount of ZnO was 5 phr,and the TPV had higher viscosity at lower shearing rate and lower viscosity at higher shearing rate.