What is organosilicon defoamer?


Silicone defoamer is a white viscous emulsion. It has been used in various industrial fields since the 1960s, but the large-scale and comprehensive rapid development began in the 1980s. As organosilicon defoamer, its application field is also very wide, more and more attention by all walks of life. Silicone defoamer is an indispensable assistant in the chemical industry, papermaking, coating, food, textile and pharmaceutical industries. It can not only remove froth on the liquid surface of the process medium, but also improve the separation, gasification, drainage and other effects of filtration, washing, extraction, distillation, evaporation, dehydration, drying, and so on, and ensure that all kinds of materials are flourishing. The capacity of the container.


After defoamer was adopted, people soon found that the operation efficiency and quality of manufacturing enterprises have been greatly improved because of the addition of defoamer. In recent years, more and more organosilicon defoamers have been widely used in all walks of life.


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. In general, in order to quickly realize defoaming, most enterprises will add defoamers for defoaming, but there are many types of defoamers, so I will take organosilicon defoamer as an example to introduce the defoaming process and principle of organosilicon defoamer.


Organosilicon has a small surface tension. After the defoamer made of organosilicon is added to the foaming system, it can be quickly dispersed among them, while the surfactant molecules are oriented on the bubble surface. When the concentration of organosilicon defoamer reaches a certain level, 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 makes the formed bubbles difficult to merge and rupture.


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 they are also inert in chemical properties. Therefore, pure silicone oil can not be used as defoamer. However, if they are emulsified to form silicone defoamer, they can spread rapidly on the solution surface, and many good defoaming effects can be achieved with less amount. (source: silicone Innovation Institute)