两种含硫硼酸酯的合成及十二胺对其抗磨性能的影响

Effect of Dodecyl Amine on the Antiwear Property of S-Containing Organic Borates as Oil Additives

人们已对有机硼酸酯的减摩抗磨性能作了许多研究，但还很少见有含硫硼酸酯减摩抗磨性能之研究的文献报道．因此，合成了两种分子链烷基中含硫的有机硼酸酯，利用四球试验机和ＭＨＫ－５００型环－块试验机考察了它们添加到基础油（四球试验和环－块试验使用的基础油分别为液体石蜡和正十四烷）中的抗磨性能，以及十二胺对它们抗磨性能的影响，并用Ｘ射线光电子能谱仪对摩擦表面的元素组成和硼、硫元素的化学结合状态进行了分析，四球试验表明，含硫硼酸酯的承载能力比不含硫硼酸酯的更高；环－块试验表明，含硫硼酸酯的抗磨性能比不含硫硼酸酯的差．十二胺的加入能够明显提高含硫硼酸酯的承载能力和抗磨性能，Ｘ射线光电子能谱分析发现，在摩擦表面膜中硼是以降解的硼酸酯的形式存在，而硫则是以有机硫化物和ＦｅＳＯ４这两种形式存在；十二胺的加入降低了硫和硼在摩擦表面膜中的含量，其结果是提高了油品的抗磨性能和承载能力．

Two sulfur-containing organic borates were prepared and the antiwear property ofthese borates added into white oil and n-tetradecane,and theeffect of dodecyl amine on antiwearproperty of the synthesized borates were measured using a four-ball tester and a ring-block tester. The results were compared with that of the propane 1,2-diol dodecyl sulfide,sulfurized cotton seedoil and tridodecyl borate,X-ray photoelectron spectroscopy(XPS)was used to examine the rubbedsurfaces of the test blocks. It was found that on four-ball tests,S-containing organic borates possess higher load-carryingcapacity than tridodecyl borate,and with the addition of dOdecyl amine,the load-carrying capacitycan be increased remarkably. As on ring-block tests,the S-containing organic borates exhibits apoorer antiwear property than tridodecyl borate,but with the addition of dodecyl amine,theantiwear property of the S-containing borates can be increased.XPS analyses indicate that sulfur onthe rubbed surfaces exists in the forms of organic sulfide and FeSO4,and the addition of aminereduces the adsorption and reaction of sulfur to the rubbing surfaces.