Talking about the problem of vacuum pump oil ring

Vacuum oil and water are two liquids that are incompatible with each other, but under certain conditions, a stable or unstable emulsion is formed. In the contact with water, the emulsification of oil and the degree of emulsification are mainly determined by the composition of the vacuum oil, the purity of the water, the nature of the components contained, and the temperature and vibration of the vacuum oil-water system.

Taking emulsification usually occurring in oils as an example, when there are some kinds of surface active substances (such as carboxylic acid derivatives) having both oleophilic groups and hydrophilic groups in vacuum oil or water, they are at temperature and concentration. When appropriate, they are brought together to form a dense monolayer in which water is encapsulated. A large amount of the aggregate is uniformly dispersed in the oil to form a water-in-oil emulsion. It can be seen that controlling the presence of surface active substances in the oil-water and destroying the dense monolayer of the surface-active substance in which the water is encapsulated is the fundamental way to prevent and resist the emulsification of the two-phase coexisting system.

The preparation of vacuum oil with deep refined base oil is of great significance for improving the anti-emulsification performance of the finished oil. However, vacuum oil contains various functional additives (mostly surfactants), which will inevitably affect the separation ability of vacuum oil to water. Therefore, the oil product development and production personnel add a certain proportion of demulsifiers with special properties in the vacuum oil to suppress this effect, so as to ensure that the vacuum oil has good demulsibility.