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Synthesis and Study on Tribological Properties of Tri-n-butyl Phosphorotetrathioate
He Wanren1, Zhang Zefu1, Liu Weimin*1, Xue Qunji1, Liang Yongmin2
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000;2.State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000
Abstract:
The chemical structure of O,O,O-tri-n-butyl phosphorothioate (TBSTP) and S,S,S-tri-n-butyl phosphorotetrathioate (TBTTP) synthesized in laboratory were analyzed by means of mass spectrometer(MS) and Bio-Red Win-IR spectrometer (FT-IR). The extreme-pressure, antiwear and friction-reducing properties of liquid paraffin with TBSTP and TBTTP as additives were examined with a four-ball machine. The worn surfaces of the steel ball were analyzed by means of X-ray photoelectron spectroscopy (XPS) and scanning electron micro-scopy (SEM). It has been found that the two compounds as additives in liquid paraffin are effective in improving the antiwear behavior and load-carrying capacity. But they can′t improve the friction-reducing behavior of liquid paraffin. The SEM morphologies and the XPS analytical results of the worn surfaces indicate that the additives absorbed in the surface by the physical or chemical process and tribochemical reactions were involved for steel-steel frictional pair, with the formation of a multiple boundary lubricating film composed of phosphorothioate and tribochemical reaction products of the lubricants.
Key words:  Tri-n-butyl phosphorothioate, S,S,S-tri-n-butyl phosphorotetrathioate, Lubricating oil additive, Tribological properties
FundProject:国家自然科学基金资助项目(29901006)
附件
正丁基硫代磷酸酯的合成及其摩擦学性能研究
何万仁1, 张泽抚1, 刘维民*1, 薛群基1, 梁永民2
1.中国科学院兰州化学物理研究所,固体润滑国家重点实验室,兰州,730000;2.兰州大学,应用有机国家重点实验室,兰州,730000
摘要:
用MS、 FT-IR等方法对合成的三正丁基一硫代及四硫代磷酸酯进行了结构表征,并在四球摩擦磨损试验机上考察了其在液体石蜡中的摩擦学性能;用扫描电镜(SEM)和X射线光电子能谱(XPS)对钢球磨痕表面做了分析.结果表明: 对于钢-钢摩擦副,合成的两种硫代磷酸酯可以显著提高液体石蜡的极压抗磨性能,但不能改善其减摩性能.钢球磨损表面XPS和SEM分析结果表明,添加剂分子在金属表面发生物理或化学吸附,并导致金属表面的腐蚀和摩擦化学反应.
关键词:  正丁基一硫代磷酸酯  正丁基四硫代磷酸酯  润滑油添加剂  摩擦学性能
DOI:10.1088/1674-0068/16/1/69-74
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