不同硫化工艺对CR/NBR共混胶热油老化前后力学性能及胶管扣压性能的影响

Effect of different vulcanization processes on the mechanical properties of CR/NBR blended rubber before and after hot oil aging and the withholding properties of hoses

本文主要研究了不同硫化工艺对CR/NBR共混胶热油老化前后力学性能的影响,采用预硫化的方法将CR部分预先硫化一定时间后,然后与NBR共混,研究预硫化对共混胶耐热油老化前后性能的影响。硫化特性实验表明预硫化工艺会降低最大转矩及转矩差值,t_(10)缩短。物理机械性能实验结果表明:预硫化工艺使得共混胶热油老化后拉断强度增大,扯断伸长率增大,老化前后性能保持率提高,综合性能改善。仿真计算结果表明预硫化工艺使得静刚度、应力集中单元处应变能密度及相同节点处Mises应力减小。

This article mainly studies the effects of different vulcanization processes on the mechanical properties of CR/NBR blended rubber before and after hot oil aging.The CR part was pre-vulcanized for a certain period of time by pre-vulcanization,and then blended with NBR to study the effect of pre-vulcanization on the performance of the blended rubber before and after heat-resistant oil aging.The vulcanization characteristic experiment shows that the pre-vulcanization process will reduce the maximum torque and the torque difference,and t_(10) will be shortened.The results of physical and mechanical performance experiments show that the pre-vulcanization process increases the tensile strength and elongation of the blended rubber after hot oil aging,as well as the performance retention rate before and after aging,and the overall performance is improved.The simulation results show that the pre-vulcanization process reduces the static stiffness,the strain energy density at the stress concentration element and the Mises stress at the same node.