Silicone defoamer is a white, viscous emulsion. It has been used in various industrial fields since the 1960s, but large-scale and comprehensive rapid development began in the 1980s. As an organic silicon defoamer, its application field is also very wide, more and more attention by all walks of life. In the chemical industry, paper making, coating, food, textile, pharmaceutical and other industrial sectors of silicone defoamer is an indispensable additive in the production process, it can not only remove the foam on the surface of the production process medium, so as to improve the filtration, washing, extraction, distillation, evaporation, dehydration, drying and other processes of separation, gasification, drainage and other effects. Ensure the capacity of various materials holding and handling containers.


After the product of defoamer was adopted by people, people soon found that due to the addition of defoamer, the operation efficiency and operation quality of manufacturing enterprises have been greatly improved than in the past. Its use can quickly eliminate bubbles in the liquid medium, so in recent years, more and more silicone defoamer has been widely used in all walks of life.


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.





Silicone has a small surface tension, and after the defoamer made of silicone 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, the surfactant molecules will form a film on the bubble wall and reduce its surface tension. Thus, the gas-liquid contact surface is increased, and 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.