炭黑对丙烯酸酯橡胶/乙烯丙烯酸酯橡胶共混胶性能的影响

Effect of carbon black on properties of acrylate rubber/ethylene acrylate rubber blends

考察了炭黑种类对丙烯酸酯橡胶(ACM)/乙烯丙烯酸酯橡胶(AEM)共混胶硫化特性、物理机械性能、耐油性能、动态力学性能及热稳定性等的影响。结果表明,与未加入炭黑的试样相比,加入不同种类炭黑后共混胶的最大转矩(MH)、最小转矩(ML)及二者之差(MH-ML)均显著增大,焦烧时间(t10)和正硫化时间(t90)均缩短。共混硫化胶的物理机械性能、耐油性能及热稳定性均显著增强,但压缩永久变形变差,玻璃化转变温度均升高,损耗因子峰值均下降。随着炭黑粒径的增大,共混胶的MH、ML和MH-ML逐渐减小,t10和t90逐渐延长,物理机械性能逐渐变差,但热稳定性及压缩永久变形逐渐升高。加入炭黑N 990的共混硫化胶的热稳定性较差。

The effects of carbon black types on the curing characteristics,physical and mechanical pro-perties,oil resistance,dynamic mechanical properties and thermal stability of acrylic rubber(ACM)/ethylene acrylate rubber(AEM)blends were investigated.The results showed that the maximum torque(MH),the minimum torque(ML)and the difference between them(MH-ML)of the blends increased significantly,the scorch time(t10)and optimum curing time(t 90)shortened significantly compared with the samples without carbon black.The physical and mechanical properties,oil resistance and thermal stability of the vulcani-zates were significantly enhanced,but the compression permanent deformation was poor,the glass transition temperature increased,and the peak value of loss factor decreased.With the increase of carbon black particle size,MH,ML and MH-ML decreased,t10 and t90 prolonged,phy-sical and mechanical properties decreased,but thermal stability and compression set increased.Vulcanizate with carbon black N990 had the worst thermal stability.