基于RPA的BIIR热氧老化过程中流变性能研究

Study on the Rheological Properties during the Thermal Oxidative Aging of Brominated Butyl Rubber Based on Rubber Processing Analyzer

采用橡胶加工分析仪(RPA)研究了不同质量分数的环氧大豆油、抗氧剂对溴化丁基橡胶(BIIR)热氧老化过程中流变性能的影响规律,并探讨了BIIR降解与凝胶产生的原因。结果表明,流变性能变化趋势与GPC数据一致,证明BIIR的热氧老化过程是一个分子交联与降解并存的过程;环氧大豆油、抗氧剂对BIIR老化过程中凝胶的生成与分子链的降解均有明显的延缓作用;不同的抗氧剂对其产生的效果具有明显差异,抗氧剂1076对BIIR氧化降解的抑制作用强于抗氧剂264。

This paper used a rubber processing analyzer(RPA)to study the effect of different amounts of epoxidized soybean oil and antioxidants on the rheological properties of brominated butyl rubber(BIIR)during the thermal oxidative aging process and discussed the cause of degradation and gel generation of BIIR.The results show that the rheological properties change trend is consistent with the GPC data,which proves that the thermal oxidative aging of BIIR is a process involving both molecular crosslinking and degradation;epoxidized soybean oil and antioxidants can greatly slow down the rate of the gel generation and molecular chain degradation during the aging process of BIIR.Different antioxidants have different anti-aging effects on BIIR.Antioxidant 1076 has a stronger inhibitory effect on oxidative degradation of BIIR than antioxidant 264.