Penn State润滑油微氧化试验方法的研究进展

Study and Development of Penn State Microoxidation Test

Penn State润滑油微氧化试验方法是一种非常有效简便的实验室评价方法,其具有油样量少,评价时间短,可半定量分析氧化产物及其组成,并减少了氧的扩散限制等优点。因此,该方法自问世以来得到了很大的发展,国外一些润滑油公司已将该方法作为评价润滑油氧化行为的手段之一。Penn State润滑油微氧化试验装置配备有凝胶色谱(GPC)和粘土吸附柱技术。该装置能够模拟发动机活塞环区域的高温薄膜条件。Penn State润滑油微氧化试验方法对一系列ASTM-ⅢD热机测试参考油样(基础油和添加剂未知)的氧化行为的测定结果与ASTM-ⅢD热机测试结果相当,对高质量传统炼制的含有本α萘胺和二烷基二硫代磷酸锌添加剂重质中性油的氧化行为的测定结果与ASTM-ⅢD内燃机测试结果一致。在评价氧化形成的漆膜和形成沉积物倾向时可进一步简化试验步骤,而且证明是鉴别基础油和混合液的有效方法。在评价许多商品机油中表明合成油在抗氧化性能和蒸发损失方面比传统矿物油稍好。有鉴于此,本文试图向国内同行介绍这一方法的发展概况,推动我国润滑油评价方法的进步和多样化。

The microoxidation test has been developed at Penn State and used successfully for the evaluation of new and used ester based aircraft gas turbine lubricants. This system combines a simple thin film oxidation test with two analytical systems for primary analysis. First, the oxidized fluid is evaluated in a Gel permeation chromatography with both refrective index and U - V detectors. The second analysis utilizes an atomic absorption spectrometer. In addition, samples prepared from GPC analysis can used for infrared, ultraviolet, and NMR analyses. At present, some oil company in USA using this test to evaluated base stocks, inhibitor additives successfully. In this paper, authors brief relate the Penn State microoxidation test and its using, as well as developments.