低挥发润滑脂流变性能研究

以自制多烷基环戊烷（MAC）为基础油、自制复合金属皂为稠化剂并加入多种自制添加剂制备了低挥发润滑脂，其各指标性能达到了国外同类产品水平，部分性能如饱和蒸气压等更优。采用流变仪研究了不同温度下润滑脂的模量随剪切应变的变化关系、恒速剪切下表观黏度随温度的变化关系、高速剪切下黏度随时间的变化关系以及触变性等流变学性质，并与国外样品进行了比较。通过扫描电镜（SEM）表征了剪切前后的稠化剂结构变化，分析了剪切机理。结果显示，研制的MAC基低挥发润滑脂的流变性整体优于国外同类产品，有利于提高转速稳定度和使用寿命。

STUDY ON RHEOLOGY PROPERTY OF LOW-VOLATILE GREASE

A low-volatile lubricating grease was prepared by using self-made multiple alkylcyclopentane (MACs) as base oil, self-made metal soap complex as thickener and various self-made additives. The performance of the prepared samples reached the level of the similar foreign product, and some of properties, such as saturated vapor pressure, were better. The rheological properties of lubricating grease, such as the change of modulus with shear strain, the change of apparent viscosity with temperature under constant shear, the change of viscosity with time under high shear and thixotropy, were studied by rheometer and the results were compared with that of foreign samples. The structural changes of thickener before and after shearing were characterized by SEM, and the shearing mechanism was analyzed. The results showed that the rheological properties of the developed MAC based low-volatile lubricating grease were better than that of the same kind of foreign product, which is conducive to improve the stability of rotating speed and service life.