How does silicone defoamer realize the defoamer process?

Bubbles are a common phenomenon in our lives, but bubbles form when a large number of bubbles gather and are continuously distributed in a liquid. A large number of bubbles exist in life and production, which not only affects the normal progress of work, but also causes certain pollution to the environment, so eliminating bubbles is a very necessary work.

Under normal circumstances, in order to quickly achieve defoaming, most companies will add defoaming agents for defoaming, but there are more types of defoaming agents, so I will take silicone defoaming agents as an example to introduce the defoaming process and principle of silicone defoaming agents.





How does silicone defoamer realize the defoamer process? What's the principle?






After the silicone defoamer is added to the foaming system, it can be quickly dispersed, and the surfactant molecules are oriented on the surface of the bubble. When the silicone defoamer reaches a certain concentration, when there are enough surfactant molecules, a film will be formed on the bubble wall, and the surface tension will be reduced, thus increasing the gas-liquid contact surface. Eventually, the formed bubbles are not easy to merge and burst.






Because the bubble film exposed to the air has a bimolecular film structure, in order to eliminate the foam, it is necessary to destroy and inhibit the formation of the gas-liquid film, so the added silicone defoamer must be able to spread quickly on the surface of the solution, enter the bimolecular oriented film of the foam, destroy the mechanical balance of the film, so as to achieve the purpose of defoaming.






For general organic compounds, their spreading coefficient is very small, and they are inert in chemical properties, so pure silicone oil can not be used as a defoamer, but the emulsification of silicone defoamer can be quickly spread on the surface of the solution, and the use of less amount can achieve a lot of good defoamer effect.