Microstructures,molecular weights and their distributions of domestic nitrile rubber(NBR)products with high bound acrylonitrile content NBR 4105,NBR 3604 and NBR 4155 and imported pro-ducts N 220 S raw rubber,curing characteristics and processabilities of compounds,physical and me-chanical properties,abrasion resistance,and ther-mal-oxidative aging resistance of vulcanizates were compared,and the application of four kinds of NBR and NBR 3604/NBR 4105 blend in oilfield drilling pump valve rubber were also explored.The results showed that weight-average molecular weight and number-average molecular weight of NBR 4105 were slightly lower than those of the other three kinds of NBR,molecular weight distribution of NBR 4105 was slightly narrower and comparable to that of N 220 S,and bound acrylonitrile content of NBR 4105 was the highest.NBR 3604 had the lowest trans-1,4-unit content and the highest cis-1,4-unit content.Scorch time of the four kinds of NBR were basically the same,NBR 3604 had the slowest vul-canization rate,the processabilities of NBR 3604 and NBR 4105 were slightly worse than those of N 220 S and NBR 4155 with of NBR 3604 having the worst processability.Tensile strength and modulus at 300％of NBR 3604 vulcanizate were slightly higher,it had smaller abrasion resistance and the smallest compression permanent set,and NBR 4105 vulca-nizate had the best thermal-oxidative aging resis-tance.NBR 3604/NBR 4105 blend was suitable for the manufacture of oilfield drilling pump valve rub-ber with better comprehensive performance.was.
关键词
丁腈橡胶/高结合丙烯腈量/物理机械性能/加工性能/老化性能/压缩永久变形/耐磨性能/油田用密封件
Key words
nitrile rubber/high-bound acryloni-trile content/physical and mechanical property/pro-cessability/aging resistance/compression permanent set/abrasion resistance/oilfield seal
维普
万方数据