活性碳酸钙对丁腈橡胶硫化反应动力学的影响

Effect of Activated Calcium Carbonate on V ulcanization Kinetics of Nitrile Rubber

设计了5种活性碳酸钙(填料)用量不同的丁腈橡胶(NBR)配方.采用无转子硫化仪测得了在3个不同温度下的硫化特性参数,利用相关的硫化反应动力学参数模型,研究了活性碳酸钙用量对丁腈橡胶硫化动力学的影响.结果表明:在焦烧期时,NBR的硫化反应为非一级反应,真正的一级反应开始于硫化速率达到最大时,即tdis;且焦烧期后的反应可以分为两个阶段且遵循一级动力学反应规律.活性碳酸钙用量的增多会阻碍一级反应的开始,且活性碳酸钙对体系的活化能影响不大.

In this paper, five types of nitrile rubber formulations with different amounts of activated calcium carbonate(filler) are designed. The vulcanization characteristic parameters at three different temperatures are measured by a rotorless vulcanizer, use the relevant vulcanization reaction kinetic parameter model, the effect of the amount of activated calcium carbonate on the vulcanization kinetics of nitrile rubber is studied. The results show that the vulcanization reaction of NBR is a non-first-order reaction during the scorch phase, and the true first-order reaction starts when the vulcanization rate reaches the maximum, that is, tdis. And the reaction after the scorch phase can be divided into two stages and follow the first-order kinetic reaction law. The increase in the amount of active calcium carbonate hinder the beginning of the first-order reaction, and the active calcium carbonate has little effect on the activation energy of the system.