【作者】 王柯卿； 何宇航； 戚亮亮； 施建峰； 郑津洋；

【Author】 WANG Keqing;HE Yuhang;QI Liangliang;SHI Jianfeng;ZHENG Jinyang;Institute of Hydrogen Energy,Zhejiang University;Polytechnic Institute,Zhejiang University;Institute of Advanced Equipment,Zhejiang University;

【机构】 浙江大学氢能研究院； 浙江大学工程师学院； 浙江大学特种装备研究所；

【摘要】 针对液化石油气(LPG)气瓶长寿命密封圈的老化问题展开了系统的原位加速老化试验。通过对比丁腈橡胶(NBR)与氢化丁腈橡胶(HNBR)在LPG介质中的老化行为,研究了不同温度和老化时间对密封圈压缩永久变形率的影响。实验结果表明,随着温度和老化时间的增加,密封圈的压缩永久变形率呈现显著上升趋势。尤其在较高温度条件下,改性HNBR的性能衰退速度较NBR更为缓慢,表明其具有更优的高温抗老化能力和更长的使用寿命。通过基于Arrhenius方程的寿命预测,评估了两种材料在LPG气瓶常温下的使用寿命。预测结果表明,改性HNBR的使用寿命为46.3年,显著高于NBR的6.4年。研究表明,改性HNBR在长期老化过程中表现出优越的耐久性和稳定性,因此,推荐在LPG气瓶长寿命瓶阀的密封圈选材中优先考虑改性H N B R,以提升气瓶的寿命和长期可靠性。更多还原

【Abstract】 This study systematically conducted in-situ accelerated aging tests to investigate the aging performance of long-life sealing rings for liquefied petroleum gas(LPG)cylinders.By comparing the aging behaviors of nitrile rubber(NBR) and hydrogenated nitrile rubber(HNBR) in an LPG environment,the effects of different temperatures and aging durations on the compression set of the sealing rings were examined.Experimental results indicated that the compression set increased significantly with rising temperature and prolonged aging time.Particularly under elevated temperature conditions,modified HNBR exhibited a slower rate of performance degradation compared to NBR,demonstrating superior high-temperature aging resistance and a longer service life.Service life predictions based on the Arrhenius equation were carried out to assess the performance of both materials under ambient LPG cylinder conditions.The prediction results showed that the service life of modified HNBR was 46.3 years,significantly higher than the 6.4 years observed for NBR.The findings suggest that modified HNBR exhibits excellent durability and stability during long-term aging,and it is therefore recommended as the preferred material for sealing rings in long-life LPG cylinder valves to enhance the cylinder’s service life and long-term reliability.更多还原