磷酸酯阴离子插层水滑石作为纳米润滑添加剂的研究

Phoshate Interlayered LDH as Nanolubricant Additive

利用尿素分解法制备了镍铝基水滑石(LDH)纳米材料,然后采用离子交换法对其进行了磷酸酯插层修饰,成功合成了二丁基磷酸酯阴离子插层水滑石(LDH-DBP)和二异辛基磷酸酯阴离子插层水滑石(LDH-OBP)纳米材料.通过傅立叶变换红外光谱仪、X射线衍射仪、热重和透射电子显微镜对所制备纳米材料的化学组成、晶体结构及颗粒形貌进行了分析表征.采用SRV-IV摩擦试验机研究其作为PAO-4的润滑添加剂的摩擦学性能,试验结果表明:磷酸酯阴离子插层修饰的水滑石纳米添加剂可显著提高PAO-4在高载荷(200 N))条件下的摩擦学性能,其减摩抗磨机理可归于水滑石纳米材料的片状吸附和磷酸酯摩擦化学反应的协同作用.

Ni-Al layered double hydroxide（LDH） was synthesized by urea pyrolysis method. The dibutyl phosphate anion interlayered LDH（LDH-DBP） and diisooctyl phosphate anion interlayered LDH（LDH-OBP） were prepared by the phosphate interlayered modification with the anion-exchange method. Their chemical composition, crystal structure and morphology were detected by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetry analysis and transmission electron microscopy. Furthermore, the tribological properties of PAO-4 using LDH, LDH-OBP and LDH-DBP as additives were characterized on the SRV-IV tribometer. The experiment results indicate that the modified additives performed excellent tribological properties under high load（200 N）. The lubrication mechanism was ascribed to the synergy between the flake adsorption of LDH and the tribochemical reaction of phosphate with metal substrates.