润滑油中橡胶5880耐老化性能研究

为了掌握润滑油中橡胶5880制品耐受情况,并进行寿命评估。采用加速老化方法,针对压缩和自由放置两种状态,分别测试分析橡胶5880在润滑油和热空气中20%恒定压缩永久变形率、拉伸强度、拉断永久变形、拉断伸长率等基本性能随时间和温度的老化衰减规律。无论是热空气还是润滑油中,橡胶5880的拉伸强度和拉断永久变形指标对热老化不敏感,无法定量表征寿命和性能之间关系,而压缩永久变形率和拉断伸长率基本符合时温等效原理。总体上,润滑油中因为屏蔽氧气,橡胶5880性能衰减更慢。同时采用指数型性能-时间衰减规律和Arrhenius公式定量描述了橡胶5880性能-时间-温度之间的关系,推算润滑油中橡胶5880密封制品的寿命约为5 a,其他不受力制品的寿命将大于25 a。

Study on Aging-resistant Performance of Rubber 5880 in Lubricating Oil

In order to know better the performance of rubber 5880 products and to evaluate their service life in lubricating oil, the accelerated aging method was used. For both states of compression and free storage, the basic properties of rubber 5880, such as compression set in 20% constant compression, tensile strength, tension set and elongation at break, were tested and analyzed with time and temperature in lubricating oil and hot air respectively. Data analysis has shown that the tensile strength and tension set of rubber 5580 in both hot air and lubricating oil are not sensitive to thermal aging, which cannot be used to characterize the relationship between its service life and performance quantitatively. But the compression set and elongation at break basically conform to the time-temperature equivalent principle. In general, the performance of rubber 5880 in lubricating oil decreases more slowly because of shielding oxygen. Additionally, the exponential performance-time decay law and the Arrhenius formula are used to quantitatively describe the performance-time-temperature relationship for rubber 5880. It is estimated that the service life of rubber 5880 in lubricating oil is 5 a for seal products or over 25 a for other non-stressed products.