分散剂对基础油中纳米二硫化钼颗粒分散与润滑性能的影响研究

Dispersion and Lubrication of Dispersants on Nano Molybdenum Disulfide Particles in Base Oils

采用激光粒度分析仪和纳米摩擦试验机分别考察了6种分散剂对基础油中纳米二硫化钼(MoS_2)颗粒的分散稳定性和油品的减摩性能,并采用红外光谱(FTIR)分析了分散剂与MoS_2纳米颗粒的接枝作用机理.试验结果表明,氨丙基三甲氧基硅烷(ATS)和山梨醇油酸酯(SPAN 80)分散剂因含有极性较强的官能团,与MoS_2接枝后能够形成牢固的化学键,不仅表现出突出的分散稳定效果,而且能大幅降低纳米MoS_2基础油的摩擦系数,而其他4种分散剂中的官能团极性较弱,与MoS_2纳米颗粒的化学键合作用较弱,容易在摩擦外力作用下破坏,导致油品的摩擦系数增加.

The dispersion of six dispersants on nano molybdenum disulfide（ MoS2） particles in base oils and friction reducing properties of nano oils were investigated by laser particle size analyzer and nanotribometer respectively. The grafting mechanism of dispersants on MoS2 was analyzed by fourier transform infrared spectroscopy（ FTIR）. The results show that aminopropyl trimethoxy silane（ ATS） and sorbital monooleate（ SPAN 80） could graft on nano MoS2 particles to form strong chemical bonds owing to containing active functional groups,which not only make ATS and SPAN 80 exhibit good dispersion effects,but also reduce significantly friction coefficient of oils containing nano MoS2 particles. However,other four dispersants containing weak functional groups could graft on the nano MoS2 particles to form the weaker chemical bonds,which were destroyed easily by shear stress in tribological tests,so as to increase the friction coefficient of nano oils.