丁腈橡胶在燃气介质中的老化性能测试研究

摘要

Based on the hot air aging test methods,a device is created to test the aging performance of rubber,which has the ability to flush test samples in the circulation of atmosphere. The NBR is used as sample to test its aging performance under different temperature and atmosphere,and predict its use of time. The results show that when accelerated aging test under air atmosphere,the deviation of the predict results and actual use time is above 80% ,the aging rate of NBR under gas environment is 1 ~ 2 times that of hot air,and when accelerated aging test undergas atmosphere,comparing the predict results and actual use time,the deviation is under 20%.%基于烘箱热空气老化试验方法，建立了一种能让试验样品处于流通气氛冲刷的闭合试验装置，对橡胶材料进行燃气环境中老化性能测试。选用丁腈橡胶为试样，测试其在不同温度、不同气氛下的老化性能，预测其使用时间。测试结果显示，采用空气气氛方法进行丁腈橡胶加速老化试验，预测的使用时间结果与实际使用时间的偏差在80%以上；燃气气氛冲刷环境下，丁腈橡胶在老化速率是热空气老化的2倍左右，且燃气气氛下的加速老化使用时间的预测结果与实际的偏差在±20%之内。