不同共混比NBR/CR共混胶的性能研究  

Study on properties of NBR/CR blends with different blending ratios

作　　者：于祥[1] 杜伟 邓涛[1] Yu Xiang;Du Wei;Deng Tao(Qingdao University of Science and Technology,Qingdao 266042,Shandong,China)

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《橡塑技术与装备》2020年第7期5-8,共4页China Rubber/Plastics Technology and Equipment

摘　　要：研究了普通硫黄硫化体系下不同共混比的NBR/CR共混胶在热空气以及热油老化(100℃,72 h)前后物理机械性能的变化规律。结果表明,老化前随着CR用量的增多,NBR/CR共混胶的M_H-M_L随之增大,硫化程度变大,硬度变大,拉伸强度略微上升;热空气老化后,NBR/CR共混胶随CR用量的增多,拉伸强度略微上升,扯断伸长率下降,但其扯断伸长率变化率以及100%定伸应力变化率较NBR硫化胶的变化率小,即加入CR后NBR/CR共混胶耐热空气性能得到改善;NBR/CR共混胶经热油老化后,硬度下降,拉伸强度略微下降。The physical and mechanical properties of NBR/CR blends with different blending ratios before and after aging(100℃,72 h)in hot air and hot oil under ordinary sulfur curing system were studied.The results show that with the increase of the amount of CR before aging,the MH-ML of NBR/CR blend rubber increases,the degree of vulcanization becomes larger,the hardness becomes higher,and the tensile strength slightly increases.After hot air aging,as the amount of CR in NBR/CR blends increases,the tensile strength of NBR/CR blends increases slightly,and the elongation at break decreases,but the rate of change in elongation at break and the rate of change in 100% constant tensile stress are smaller than those of NBR vulcanizate after adding CR,which means the heat resistance air performance of NBR/CR blend rubber is improved.After aging of hot oil,the hardness of NBR/CR blend rubber decreases,and the tensile strength decreases slightly.

关 键 词：NBR CR 共混比 热空气老化 热油老化 

分 类 号：TQ333.7[化学工程—橡胶工业]