脂肪酸甲酯型含氮硼酸酯的合成及摩擦学性能研究

摘要

以脂肪酸甲酯为原料合成一种新型含氮硼酸酯添加剂.通过红外光谱仪对所合成添加剂进行表征,采用四球摩擦试验仪考察其在不同基础油中的摩擦学性能,同时考察摩擦时间、载荷对菜籽油润滑下钢球磨斑直径(WSD)的影响,并用扫描电子显微镜(SEM)和能谱仪(EDS)分析含氮硼酸酯添加剂对钢球摩擦表面膜的组成和化学状态的影响.结果表明:含氮硼酸酯添加剂具有良好的极压抗磨效果.在钢球磨损表面发现含有硼元素,表明在摩擦过程中,通过物理吸附和化学反应在摩擦表面生成了含硼的润滑膜,起到了极压抗磨的作用.%A novel nitrogen-containing boric acid ester was synthesized from fatty acid methyl ester to be used as lubricant additive. The synthesized additive was characterized by FT-IR technique and its tribological performance in various base oils, e. g. the effect of friction time and load on PB value and wear scar diameter (WSD), were investigated using a four-ball tester. The morphologies of the worn scars were analyzed by means of scanning electron microscopy and energy dispersive X-ray spectroscopy to study the effect of said novel additive on the compositions and chemical states of the friction surface film. Results showed that this nitrogen-containing boric acid ester additive exhibited excellent extreme pressure anti-wear performance. Boron was detected from the worn surface of tested steel ball, which indicated that a lubricating film containing boron was formed on the friction surface by physical adsorption and chemical reaction, resulting in an enhancement of extreme pressure anti-wear function.