【中文摘要】本项目针对水基润滑中摩擦副的表面特性对水基润滑剂的润滑特性和成膜机理进行研究。研究了受限于两疏水表面间的水膜的润滑特性。发现当接触区入口附近形成固－液－气三相界面时，接触区内会形成一层水膜隔离开两表面，从而形成较低的摩擦系数。研究了水中存在微量油情况下液体的成膜特性，发现摩擦副的表面特性对成膜能力有着显著的影响。当摩擦副与水的接触角较大时所形成的膜厚较厚。提出水分子和油分子相互竞争吸附的理论，成功的解释了水中微量油的成膜行为。研究了高水基乳液中乳化剂HLB值、制备乳化液的搅拌强度、乳化剂含量等因素对乳化液成膜特性的影响规律。研究发现乳化液成膜厚度与乳化液中油滴的粒度和乳化液的稳定性有着密切的联系。乳化液油滴粒度小、稳定性高时，乳化液破乳困难，在接触区附近形成油连续相的难度增加，因而所形成的润滑膜较薄。研究了半乳糖水溶液的成膜特性，发现当浓度为10%时具有最大的膜厚，并且随着速度的增大膜厚存在一饱和值。
【英文摘要】This project focuses on the influence of the surface properties on the lubricating properties and film forming mechanism of water based lubricant. The lubricating properties of water film confined between two hydrophobic surfaces were studied. When a solid-liquid-air interphase is formed at the entrance of the contact area, a water film can be formed in the contact area to separate the two contact surfaces. As a result, a low friction coefficient can be obtained. The film forming characteristic of tiny oil in water was investigated. The film forming characteristic was influenced strongly by the surface properties. The film thickness is relative thick as the contact angle between water and surface is large. The competitive wetting effect between oil molecular and water molecular on surface was proposed to explain the film forming behavior of tiny oil in water. The influence of HLB value, mixture intensity, the emolsifier content on the film forming properties of water based emulsion were studied. It was found that the film thickness of the emulsion was influenced by the size of oil particles and stability of the emulsion. The emulsion with small particle size and high stability is difficult to be demulsified. The continuous phase of oil can hardly formed at the entrance of the contact region, which results in a small film thickness. The film forming properties of galactose solution was also studied. A maximum film thickness can be obtained as the concentration of the solution is 10%. And the film thickness reaches a saturation value as the speed is larger than a special value.
【结题摘要】本项目针对水基润滑中摩擦副的表面特性对水基润滑剂的润滑特性和成膜机理进行研究。研究了受限于两疏水表面间的水膜的润滑特性。发现当接触区入口附近形成固－液－气三相界面时，接触区内会形成一层水膜隔离开两表面，从而形成较低的摩擦系数。研究了水中存在微量油情况下液体的成膜特性，发现摩擦副的表面特性对成膜能力有着显著的影响。当摩擦副与水的接触角较大时所形成的膜厚较厚。提出水分子和油分子相互竞争吸附的理论，成功的解释了水中微量油的成膜行为。研究了高水基乳液中乳化剂HLB值、制备乳化液的搅拌强度、乳化剂含量等因素对乳化液成膜特性的影响规律。研究发现乳化液成膜厚度与乳化液中油滴的粒度和乳化液的稳定性有着密切的联系。乳化液油滴粒度小、稳定性高时，乳化液破乳困难，在接触区附近形成油连续相的难度增加，因而所形成的润滑膜较薄。研究了半乳糖水溶液的成膜特性，发现当浓度为10%时具有最大的膜厚，并且随着速度的增大膜厚存在一饱和值。