稀土氟化物纳米润滑油添加剂的合成及应用

利用正交实验法研究了氧基二硫代磷酸(DDP-18)的最佳合成条件:以C18醇及P2S5为原料,在起始温度90℃,反应温度120℃,P2S5用量超出理论用量的10%,反应时间6h时,可以制备出硫磷酸含量接近80%的表面修饰剂二烷氧基二硫代磷酸的固体粉末.采用共沉淀表面修饰法在醇—水体系中制备了双十八烷氧基二硫代磷酸吡啶盐(PyDDP-18)表面修饰的LaF3纳米微粒,并利用红外光谱、透射电镜等手段表征其结构;作为润滑油添加剂,通过四球抗磨实验测试了其润滑性能,结果表明:表面修饰稀土氟化物纳米微粒在有机溶剂中具有良好的分散性,以其作为添加剂调制出的润滑油具有较好的减摩抗磨性能.

Synthesis and application of nanorare-earth fluoride lubricating oil additives

The optimal synthesis conditions of DDP-18 are obtained by orthogonal experiments. Using C18 and P2S5 as material, the solid powder of DDP-18 surface modifying agent can be synthesized when initial temperature is 90 ℃, reaction temperature is 120 ℃, the actual dose of P2S5 is more 10% than its theoretical dose and reaction time is 6 h, whose purity is close to 80%. The rare-earth fluoride nanoparticles whose surface is modified by DDP-18------PyDDP-18 is synthesized in water ethanol solvent. The structure of the surface-modified rare-earth fluoride nanoparticles is characterized using infrared spectrum and transmission electron microscopy. The surface-modified rare-earth fluoride nanoparticles may be used as the additive for lubricating oil. The lubricating capability of the additive is measured by four-ball antiwear test. The test results indicate that the lubricating oil additive can be well dispersed in organic solvent and has better antiwear and friction reducing capacity.