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某型航空润滑油主要由基础油聚α-烯烃(PAO)和抗氧剂N-苯基-α-萘胺(T531)组成。借助高温高压反应釜模拟航空发动机温度,研究不同温度下抗氧剂T531对PAO理化性能的影响,并利用气相色谱/质谱联用(GC/MS)技术从分子水平上分析反应产物的结构组分变化,探究PAO和T531的高温衰变机制。结果表明,高温促使PAO基础油发生分子链断裂反应并产生了含氧化合物,致使PAO黏度降低和酸值升高;在一定温度范围内T531较好地延缓了PAO分子链的断裂;T531长时间在高温环境中也会发生衰变,产生大量链状酮类化合物,加深了润滑油颜色。
Aero lubricants mainly consist of base polyalphaolefin (PAO) and antioxidant N-phenyl-alpha-naphthylamine (T531). The effects of antioxidant T531 on the physical and chemical properties of PAO were studied by simulating the temperature of aeroengine with a high temperature and high pressure reactor. The structural components of the reaction product were analyzed by gas chromatography / mass spectrometry (GC / MS) Change, explore the PAO and T531 high temperature decay mechanism. The results showed that high temperature led to the molecular chain fracture reaction of PAO base oil and the production of oxygenated compounds, resulting in lower viscosity and higher acid value of PAO; T531 delayed the fracture of PAO molecular chain in a certain temperature range; T531 prolonged Decay occurs in high temperature environment, resulting in a large number of chain ketones, deepen the color of lubricants.