新型含氮、硫杂环有机硼酸酯在菜籽油中的摩擦学性能研究

Tribological Performance of Organic Borate Esters Containing Nitrogen and Sulfur as Additive in Rapeseed Oil

从分子设计的观点出发,合成了一种新型含氮、硫杂环有机硼酸酯润滑油添加剂2-硫酮苯并噻唑啉-3-甲基二异辛基硼酸酯(ITTB)。采用四球摩擦磨损试验机评价了其摩擦学性能。结果表明:在菜籽油(RO)中加入添加剂以后,其承载能力明显提高,磨斑直径和摩擦因数均显著降低。从磨斑表面SEM,XPS分析结果可以推断,添加剂在摩擦过程中发生了摩擦化学降解反应,硫元素在钢球的表面形成了一层含Fe2(SO4)3和FeS2的反应膜,氮、硼元素则以吸附膜的形式存在于摩擦表面,2种膜的共同作用提高了菜籽油的减摩抗磨性能及承载能力。

From the point view of molecular design, a new borate containing sulfur and nitrogen （ diisooctyl （ 2-thioxobenzo[ d ] thiazol-3 （2H）-yl） ） methyl borate was synthesized and the tribological performance of the novel additive in the rapeseed oil were investigated using a four-ball machine. The chemical features of the worn steel surfaces were observed and examined by means of X-ray photoelectron spectroscopy （XPS） and SEM. The result indicates that the additive can obviously increase the load-carrying capacity, anti-wear and wear-reducing abilities of rapeseed oil. The XPS analytical resuits of typical elements on the worn steel surfaces demonstrate that the nitrogen and boron elements are absorbed on the rubbed surface, however the sulfur element is reacted with the metal surface and formed the reaction film containing Fe2 （ SO4 ） 3 and FeS2. The chemical reaction film and adsorption film enhance the load-carrying capacity and improve the anti-wear performance and reduce the friction property of the rapeseed oil.