NBR的硫化体系优化

Optimizing of Vulcanization System of NBR

研究了硫黄硫化体系中硫黄变量以及过氧化物硫化体系中DCP变量对NBR硫化特性、硫化动力学及力学性能、耐老化性能的影响。结果表明,NBR混炼胶的焦烧时间、正硫化时间均随硫黄用量或过氧化物用量的增加而降低,硫化程度和硫化速率增加;硫黄硫化表现为两个一级反应,而过氧化物硫化为一个一级反应,并且硫化反应速率常数随DCP用量的增加而线性增大;与硫黄硫化体系相比,过氧化物硫化体系得到的NBR硫化胶具有较好的抗压变性能和耐老化性能。

The effect of sulfur content in sulfur vulcanization and dicumyl peroxide（DCP）content in peroxide vulcanization on curing characteristics,curing dynamics of nitrile rubber（NBR）compound and physical and mechanical properties,ageing-resistant performance of NBR vulcanizate were investigated.The results showed that with the increase of sulfur or DCP content,the scorch time and vulcanization time of NBR compound reduced,but the vulcanization degree and the curing rate increased.The vulcanization process had two first order reactions in the sulfur vulcanization and only a first order reaction in the peroxide vulcanization.The curing reaction rate constant increased linearly with the increase of DCP content.Compared with sulfur vulcanization,the NBR vulcanizate had good compression resistance and aging resistance with peroxide vulcanization.