国产丁基橡胶IIR 1751的基本性能

Basic properties of domestic butyl rubber IIR 1751

采用凝胶渗透色谱仪、核磁共振氢谱、动态热机械分析(DMA)仪、热失重分析仪和差示扫描量热(DSC)仪研究了国产丁基橡胶(牌号为IIR 1751)的基本性能,并与国外同类产品Butyl 268、Butyl301进行了对比。结果表明,与Butyl 268和Butyl 301相比,IIR 1751的数均分子量和重均分子量低,分子量分布窄,不饱和度居中,分解温度较高,灰分和挥发分含量低;DSC测得IIR 1751生胶的玻璃化转变温度(Tg)与Butyl 268相同,略高于Butyl 301;DMA测得IIR 1751硫化胶的Tg居中,填料网络强,炭黑分散性较差;与Butyl 268和Butyl 301混炼胶相比,IIR 1751混炼胶的门尼黏度居中,加工性能较好,具有较长的硫化操作安全期和较快的硫化速率,交联密度最大;IIR 1751硫化胶的抗疲劳性能和耐热氧老化性能优于Butyl 268和Butyl 301硫化胶。

The basic properties of domestic butyl rubber（ brand IIR 1751） was studied by different analytical means,such as gel permeation chromatography,1H-nuclear magnetic resonance spectroscopy,dynamic thermomechanical analysis（ DMA）,thermal gravimetric analysis and differential scanning calorimetry（ DSC） and compared with those of similar foreign products Butyl 268 and Butyl 301. The results showed that compared with Butyl 268 and Butyl 301, IIR 1751 had a narrower molecular weight distribution,lower number-average molecular weight and weight-average molecular weight,mediate unsaturation degree,higher decomposition temperature and lower ash and volatile contents. The glass transition temperature（ Tg） of IIR 1751 crude rubber by DSC was the same to that of Butyl 268,slightly higher than that of Butyl 301,the Tgof IIR 1751 vulcanizates by DMA was between those of Butyl 268 and Butyl 301, its filler network was stronger,and its carbon black dispersivity was poor.Compared with Butyl 268 and Butyl 301 compounds,IIR 1751 had medium Mooney viscosity,better processability,a longer scorch safety period and a faster curing rate. And the fatigue resistance and heat-oxygen aging resistance of IIR 1751 vulcanizates were better than those of Butyl 268 and Butyl 301.