含硼和氮的脂肪酸水基润滑添加剂的制备及其摩擦学性能

Synthesis and Tribological Behavior of Boron-nitrogen Modified Fatty Acid as Water-based Lubricating Additive

通过在脂肪酸分子中引入硼和氮,合成了新型水基润滑添加剂(BNR),用红外光谱仪对其主要官能团进行了鉴定,用四球摩擦磨损试验机考察了合成产物在水中的抗磨和极压性能,用X射线光电子能谱仪分析了钢球磨损表面典型元素的化学状态,并探讨了该类添加剂的极压抗磨作用机理.结果表明:含硼和氮的水基润滑添加剂具有优良的抗磨和减摩性能;由于长链脂肪酸分子的载体作用、硼的缺电子性、氮的高反应活性以及三者的协同作用,添加剂在钢球磨损表面形成了高强度的吸附膜和(或)摩擦化学反应膜,从而表现出良好的抗磨和极压作用.

A new type of boronnitrogen modified fatty acid as waterbased lubricating additive was prepared and the chemical feature characterized by means of infrared spectrometry. The tribological properties of the additive in water were evaluated on an MQ800 fourball friction and wear tester. The chemical states of some typical elements on the worn steel surface were analyzed by means of Xray photoelectron spectroscopy. The results showed that the additive functioned to considerably increase the loadcarrying capacity and antiwear and frictionreducing abilities of water. This was attributed to the formation of a boundary lubricating film wellbonded on the rubbing steel surface, by way of adsorption and tribochemical reaction, in the presence of the long chain fatty acid molecules as a carrier to adsorb onto the rubbing steel surface, N of high reaction activity and B of electrondeficiency as the reaction hosts and their synergistic effect.