不同支化程度丁腈橡胶性能的研究  

Property of NBR with Different Branching Degree

作　　者：郑方远 刘苹 王雷雷 段海东 ZHENG Fangyuan;LIU Ping;WANG Leilei;DUAN Haidong(Yanshan Branch of Beijing Research Institute of Chemical Industry,SINOPEC,Beijing 102500,China)

机构地区：[1]中国石化北京化工研究院燕山分院橡塑新型材料合成国家工程研究中心

出　　处：《橡胶工业》2020年第1期30-34,共5页China Rubber Industry

摘　　要：通过对比结合丙烯腈含量和门尼粘度相近的3个牌号丁腈橡胶(NBR)的分子结构参数、加工性能和硫化胶性能,研究NBR支化程度对其性能的影响。结果表明:采用橡胶加工分析仪对生胶进行频率扫描、应变扫描、应力松弛3种方式分析得出了3种NBR的支化程度高低顺序;高支化程度NBR生胶和混炼胶的粘度对剪切速率敏感性强,混炼胶门尼粘度相对于生胶门尼粘度的增加值小,炭黑分散性高,硫化胶性能均一性好;低支化程度NBR生胶和混炼胶的粘度对温度敏感性强,硫化胶的拉伸强度、拉断伸长率较高,压缩永久变形小。The influence of NBR branching degree on its properties was studied by comparing molecular structure parameter,processability and vulcanizate properties of three brands of nitrile-butadiene rubber(NBR) with similar bound acrylonitrile content and Mooney viscosity. The order of branching degree was obtained through the frequency scanning,strain scanning,and stress relaxation analysis. For raw rubber and mixing compound of NBR with higher branching degree,the viscosity was more sensitive to shear rate,the increase of Mooney viscosity of mixed compound relative to that of raw rubber was small,and the carbon black dispersion and the homogeneity of vulcanizate property were better. For raw rubber and mixing compound of NBR with low branching degree,the viscosity was more sensitive to temperature,the tensile strength and elongation at break were higher,and compression set of the vulcanizates was smaller.

关 键 词：丁腈橡胶 支化程度 分子结构参数 相对分子质量 结合丙烯腈含量 门尼粘度 加工性能 物理性能 

分 类 号：TQ333.7[化学工程—橡胶工业]