氟油的化学和热稳定性评价方法研究

Study on Chemical and Thermal Stability Evaluation Methods of Fluorinated Oil

氟油是分子中含有氟元素的有机化合物,是烷烃或醚类分子中的氢被氟全部或者部分取代后生成的氟碳化合物,包括全氟碳油、氟氯油和全氟聚醚油等。氟油具有优良的化学和热稳定性、黏温特性和润滑特性,被广泛应用于航空航天、电子、化工、机械和核工业等领域。为了考察氟油的化学和热稳定性,提出了模拟加速的试验方法,通过添加氧气、加热加压等手段,加速氟油的微量降解。采用差示扫描量热法、核磁共振法(氟谱)对模拟加速试验前后的氟油样品进行了检测,同时开发了离子色谱法高灵敏度测定氟油样品中氟离子的浓度,用以考察氟油的化学和热稳定性。在该模拟加速试验条件和测试方法下,当氟离子的浓度不超过5mg/L时,可以初步判定氟油具有良好的稳定性。

Fluorinated oil is fluorine-containing organic compound,which is formed after the hydrogen in alkane or ether molecules is completely or partially replaced by fluorine.It includes perfluorocarbon oil,fluorochlorine oil,and perfluoropolyether oil.Fluorinated oil has excellent chemical and thermal stability,viscosity temperature properties and lubrication properties,and is widely used in fields such as aerospace,electronics,chemical,mechanical and nuclear industries.In this article,in order to investigate the chemical and thermal stability of fluorinated oil,a simulated acceleration test method is proposed,which accelerates the micro degradation of fluorinated oil by adding oxygen,heating and pressurizing.Differential scanning calorimetry and nuclear magnetic resonance are used to detect the fluorinated oil samples,which are undergone accelerated testing.A highly sensitive ion chromatography method is developed to determine the fluorine ion concentrations in the samples to investigate the chemical and thermal stability of fluorinated oil.Under the simulated acceleration test conditions and test methods in this paper,when the concentration of fluorine ion is not more than 5mg/L,it can be preliminarily shown that the fluorinated oil has good stability.