酸性介质条件下的橡胶密封条加速老化寿命预测  

Prediction of Accelerated Aging Life of Rubber Seals Under Acidic Media Conditions

作　　者：吴浩春 吕晓仁[1] 姚志宏 王跃明 郭飞[3] WU Haochun;LV Xiaoren;YAO Zhihong;WANG Yueming;GUO Fei(College of Mechanical Engineering,Shenyang University of Technology,Shenyang Liaoning 110870,China;Beijing Tsinglan Sealing Technology Co.,Ltd.,Beijing 100084,China;State Key Laboratory of Tribology in Advanced Equipment,Tsinghua University,Beijing 100084,China)

机构地区：[1]沈阳工业大学机械工程学院,辽宁沈阳110870 [2]北京清蓝新科密封技术有限公司,北京100084 [3]清华大学高端装备界面科学与技术全国重点实验室,北京100084

出　　处：《润滑与密封》2025年第3期41-48,共8页Lubrication Engineering

基　　金：国家重点研发计划项目(2021YFB3400600)。

摘　　要：采用热空气加速老化试验,研究在酸性介质环境及不同温度下三元乙丙橡胶(EPDM)老化后的力学性能和压缩永久变形,利用Arrhenius方程,拟合压缩永久变形量与时间、温度的关系,建立时温等效模型。以压缩永久变形量80%和密封能力作为判断标准,预测得出三元乙丙橡胶在60℃温度下的寿命为606天。构建有限元仿真模型,获取不同老化时间后橡胶密封条密封面的接触压力,通过流固耦合分析计算得出,老化15天密封胶条泄漏率为0.188 mL/h。将在酸性介质环境下老化不同天数的橡胶密封条,放入试验工装中进行气泡法试验验证,发现老化14天之后,有小气泡产生,发生泄漏。对比数值仿真得到的结果和试验结果,发现理论模型与实际情况一致性较好,验证了该理论模型可为橡胶密封条的老化行为分析,对工业生产及实际应用提供指导。The mechanical properties and compression permanent deformation of ethylene-propylene terpolymer(EPDM)rubber were investigated using a hot air accelerated aging test under acidic medium conditions at different temperatures.The Arrhenius equation was employed to fit the relationship between compression permanent deformation and time-temperature variables,and a time-temperature equivalence model was established.According to the criteria of 80%compression permanent deformation and corresponding sealing ability,it is predicted that the lifespan of EPDM rubber at 60℃is 606 days.A finite element model was constructed to simulate the contact pressure on the sealing surface of the rubber sealing strip after different aging duration.Fluid-solid coupling analysis reveals that the leakage rate of the sealing strip is 0.188 mL/h after 15 days of aging.Experimental verification was conducted by aging rubber sealing strips for varying duration in the acidic medium and testing them in a fixture using the bubble method.After 14 days of aging,it is found that there is a small bubble,and the leakage occurs.Comparing the results obtained from numerical simulation and the test results,it is found that the theoretical model is in good agreement with the actual situation,which verifies that the theoretical model can provide guidance for the aging behavior analysis of rubber sealing strips for industrial production and practical application.

关 键 词：橡胶密封 老化 酸性介质 寿命预测 流固耦合 

分 类 号：TB42[一般工业技术]