How can organosilicon defoamer achieve defoaming process?


Bubble is a common phenomenon in our life, but a large number of bubbles form and form foam when they are continuously distributed in liquid. A large number of bubbles exist in life and production, not only affect the normal work, but also cause some pollution to the environment, so eliminating foam is a very necessary job.


Usually, in order to achieve defoaming quickly, most enterprises will add defoamers to defoam, but there are many kinds of defoamers, so I will take silicone defoamers as an example to introduce the defoaming process and principle of silicone defoamers.


How can organosilicon defoamer achieve defoaming process? What is the principle? One


When silicone defoamer is added to the foaming system, it can be dispersed quickly, and the surfactant molecules are aligned on the bubble surface. When the silicone defoamer reaches a certain concentration and the surfactant molecules are enough, a film will be formed on the bubble wall, and the surface tension will be reduced, thus increasing the gas-liquid contact surface, and ultimately making the formed bubbles difficult. Merge and break up.


Because the bubble film exposed to air has a bilayer membrane structure, to eliminate foam, it is necessary to destroy and inhibit the formation of gas-liquid film. Therefore, the added silicone defoamer must be able to spread quickly on the surface of the solution and enter the bimolecular oriented film of foam, which destroys the mechanical balance of the membrane, thereby achieving the purpose of defoaming.


For general organic compounds, their spreading coefficient is very small and their chemical properties are inert, so pure silicone oil can not be used as defoamer, but after emulsifying it to form silicone defoamer, it can spread quickly on the surface of the solution, and many good defoaming effects can be achieved with less amount.


We make a little supplement to the defoaming principle of silicone defoamer: as polyether itself has certain defoaming and anti foaming ability, it is regarded as a synergist of silicone emulsion, and can produce synergistic effect with silicone emulsion, so that its defoaming effect will be nearly doubled in the original silicone emulsion. This is also what we often call polyether modified silicone defoamer. Source: Silicon Carbon Rat