液体低分子聚异戊二烯改性丁腈橡胶发泡材料  

Liquid low molecular polyisoprene modified nitrile rubber foaming materials

作　　者：王文玉 董瑞宝 李志波[2] 潘广勤[1] WANG Wenyu;DONG Ruibao;LI Zhibo;PAN Guangqin(College of Environment and Safety Engineering,Qingdao University of Science&Technology,Qingdao 266061,Shandong,China;College of Polymer Science and Engineering,Qingdao University of Science&Technology,Qingdao 266061,Shandong,China)

机构地区：[1]青岛科技大学环境与安全工程学院,山东青岛266061 [2]青岛科技大学高分子科学与工程学院,山东青岛266061

出　　处：《化工进展》2020年第8期3230-3234,共5页Chemical Industry and Engineering Progress

基　　金：双一流建设资助课题(02002702002);科研启动资助课题(010022685)。

摘　　要：借助核磁共振技术研究了中丙烯腈含量(丙烯腈含量约33%)的4个牌号丁腈橡胶(NBR)的微观结构对NBR硫化速度的影响,以此探索提高NBR硫化速度的方法。结果表明,在NBR分子链中存在着三种微观结构,即顺式1,4-、反式1,4-和乙烯基结构,其中乙烯基结构的含量与NBR的硫化速度有关联的规律性,乙烯基结构含量高则NBR硫化速度快。低分子液体聚异戊二烯(LLPI)作为NBR的改性剂提高了NBR的硫化速度,当添加5份LLPI时,正硫化时间比未添加缩短了约2.5min;LLPI也改善了NBR的加工性能,降低了胶料的门尼黏度;还提升了发泡材料的力学性能,添加5份LLPI的发泡材料拉伸强度增大了14.2%,拉断伸长率减小了27.1%,并且可以与NBR形成交联网络并提高交联结构紧密性,降低胶料的熔体强度,使发泡材料的泡孔生长良好。The effect of microstructure of four grades of nitrile rubber(NBR) on vulcanization rate of NBR was studied by means of NMR,and the method of increasing the vulcanization rate of NBR was explored.The results show that there are three olefin structures in the NBR molecular chain:cis 1,4-polybutadiene,trans 1,4-polybutadiene and 1,2-vinyl.1,2-Vinyl has a correlation with the vulcanization rate of NBR.When the 1,2-vinyl content is high,the vulcanization rate is fast.The low molecular weight polyisoprene(LLPI) as a modifier of NBR increases the vulcanization rate of NBR and improves the NBR processability and mechanical properties of the foamed material.The tensile strength of foamed materials with 5 parts of LLPI increased by 14.2% and the elongation at break decreased by 27.1%.And LLPI can form crosslinking network and improve the tightness of cross-linking structure,reduce the melt strength of the rubber compound,and make the foaming of the foaming material good.

关 键 词：丁腈橡胶 液体聚异戊二烯 乙烯基结构 硫化速率 发泡 力学性能 

分 类 号：TQ333.7[化学工程—橡胶工业]