Vacuum pump oil emulsion ring problem

Vacuum oil and water are two immiscible liquids, but under certain conditions, they will form a stable or unstable emulsion. In contact with water, whether the oil is emulsified and the degree of emulsification are mainly determined by the composition of the vacuum oil and the purity of the water, the properties of the components contained, and are also related to the temperature and vibration of the vacuum oil-water system.

Taking the emulsification that usually occurs in oil products as an example, when there is a certain type of surfactant (such as carboxylic acid derivatives) with both lipophilic and hydrophilic groups in vacuum oil or water, they will associate together at the right temperature and concentration to form a dense monolayer to enclose water. A large number of association bodies are evenly dispersed in the oil to form an oil-in-water emulsion. It can be seen that controlling the presence of surfactants in oil-water and destroying the dense monolayer of surfactants that enclose water is the fundamental way to prevent and resist the emulsification of the two-phase coexistence system.