在机械运动装置的两对偶摩擦面,完全由润滑油隔离开来的流体润滑领域中,摩擦阻力主要取决于润滑油的粘度。而在边界润滑领域中,虽然润滑油的粘度相同,但随着润滑油种类的不同,其边界摩擦系数却有很大差异。造成这种差异的特性称之为润滑油的油性。添加到润滑油中能减低其摩擦和磨损的添加剂叫做油性剂。通常油性剂是一类具有表面活性的化合物,可以把它看成是既含有极性基团,又含 In the field of fluid lubrication, which is completely separated by lubricating oil, on the two dual friction surfaces of the mechanical movement, the frictional resistance mainly depends on the viscosity of the lubricating oil. In the field of boundary lubrication, although the viscosity of lubricating oil is the same, the friction coefficient of the boundary varies greatly with the type of lubricating oil. The characteristic that causes this difference is called oiliness. Add to the lubricating oil to reduce its friction and wear additives called oily agent. Usually oily agents are a class of surface-active compounds that can be thought of as containing both polar groups and