电工装备对高耐久橡胶密封件的需求在不断增长,压缩永久变形是评估橡胶材料耐久性的关键参数。以乙烯-丁烯-第三单体(EBT)橡胶为基体,通过引入石墨烯(GN)与二甲基丙烯酸锌(ZDMA)构建协同增强体系,制备了EBT/GN-ZDMA复合材料,研究了复合材料的压缩永久变形行为及寿命预测模型。结合多温度加速老化实验与非线性动力学分析,揭示了GN的刚性网络抑制效应与ZDMA动态键重组的协同机理。基于时温等效原理,建立了Arrhenius模型方程,预测EBT/GN-ZDMA复合材料在23℃条件下自然老化寿命为138.9年,较EBT/GN和EBT/ZDMA复合材料自然老化寿命增加约2倍。研究表明,得益于GN提供的刚性支撑以及ZDMA在高温下促进的动态键重组,EBT/GN-ZDMA复合材料抵抗变形能力显著提升,与EBT/ZDMA和EBT/GN复合材料相比,EBT/GN-ZDMA复合材料抵抗变形的能力分别提高了31%和27%,为极端工况下密封材料的设计提供了理论依据与工程化解决方案。
The demand for highly durable rubber seals in electrical equipment is constantly growing,and compression set is a critical parameter for evaluating the durability of rubber materials.In this study,an ethylene-butylene-terpolymer (EBT) rubber was used as the matrix,and a synergistic reinforcement system was constructed by incorporating graphene (GN) and zinc dimethacrylate (ZDMA) to prepare EBT/GN-ZDMA composites.The compression set behavior and life prediction model of the composites were investigated.Combining multi-temperature accelerated aging experiments with nonlinear kinetic analysis,the synergistic mechanism involving the rigid network inhibition effect of GN and the dynamic bond recombination of ZDMA was revealed.Based on the time-temperature superposition principle,an Arrhenius model equation was established.The results predicted that the natural aging life of the EBT/GN-ZDMA composite at 23°C was 138.9 years,which was approximately three times longer than that of the EBT/GN and EBT/ZDMA composites.The findings indicated that,benefiting from the rigid support provided by GN and the dynamic bond rearrangement promoted by ZDMA at high temperatures,the deformation resistance of the EBT/GN-ZDMA composite was significantly enhanced.Compared with the EBT/ZDMA and EBT/GN composites,the deformation resistance of the EBT/GN-ZDMA composite increased by 31% and 27%,respectively,providing a theoretical basis and engineering solutions for the design of sealing materials under extreme service conditions.
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基金资助
国网新疆电力有限公司科技项目资助(5230DK250006)
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