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分别选用喹啉、吲哚、甲基苄基硫醚及二苯并噻吩作为润滑油基础油中碱性氮、非碱性氮、硫醚类及噻吩类模型化合物 ,以饱和烃为主的白油作为润滑油基础油的替代物 ,研究这些杂原子化合物对润滑油基础油氧化性能的影响。为了模拟润滑油实际使用情况 ,同时考察了金属铜和环烷酸铜在与硫、氮化合物共存时对润滑油基础油氧化的催化作用。研究表明 ,金属铜强化了喹啉对白油的氧化催化作用 ;环烷酸铜由于与喹啉之间存在络合效应 ,抑制了喹啉对白油的氧化催化作用。吲哚加入量大于 5 0 0 μg/ g时 ,能抑制白油氧化 ,在环烷酸铜存在时 ,抑制作用更为突出 ;而有金属铜存在时 ,吲哚则没有抑制氧化作用。当二苯并噻吩加入量为 2 0 0 μg/ g左右 ,且与金属铜共存时 ,能抑制白油氧化 ,而与环烷酸铜共存时 ,则完全没有抑制氧化的作用。以金属铜或环烷酸铜为催化剂时 ,甲基苄基硫醚对白油均表现了很强的抑制氧化能力。
The quinoline, indole, methylbenzyl sulfide and dibenzothiophene were selected as the basic nitrogen, non-basic nitrogen, thioether and thiophene compounds in the lubricating oil base oil respectively, and the saturated hydrocarbon-based white As an alternative to lubricating base oils, the effects of these heteroatom compounds on the oxidation properties of lubricating base oils were investigated. In order to simulate the actual usage of lubricating oil, the catalytic action of metallic copper and copper naphthenate on the oxidation of lubricating base oil in the presence of sulfur and nitrogen compounds was also investigated. The results showed that copper metal enhanced the oxidation catalytic effect of quinoline on white oil. Copper naphthenate inhibited the oxidation catalytic effect of quinoline on white oil because of its complexation with quinoline. Indole addition greater than 500 g / g, can inhibit the white oil oxidation, in the presence of copper naphthenate inhibition is more prominent; and in the presence of copper, indole did not inhibit oxidation. When dibenzothiophene was added at about 200 μg / g and coexisted with metallic copper, the oxidation of white oil could be inhibited. When co-existing with copper naphthenate, there was no inhibition of oxidation. With copper metal or copper naphthenate as a catalyst, methylbenzyl sulfide on white oil showed a strong inhibition of oxidation.