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 a silicone defoamer, its application fields are also very wide, and it has been paid more and more attention by all walks of life. Silicone defoamer is an indispensable additive in the production process in chemical, paper, paint, food, textile, pharmaceutical and other industrial sectors. It can not only remove the foam on the liquid surface of the process medium in the production process, thereby improving filtration, The separation, gasification, drainage and other effects of washing, extraction, distillation, evaporation, dehydration, drying and other processes ensure the capacity of various materials and processing containers.

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

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

Silicone has a small surface tension. After the defoamer made of silicone is added to the foaming system, it can be quickly dispersed in it, while the surfactant molecules are aligned on the surface of the bubbles. When the silicone defoamer reaches a certain level When the concentration of surfactant is sufficient, a film will be formed on the bubble wall and its surface tension will be reduced, thereby increasing the gas-liquid contact surface, and finally making the formed bubbles difficult to merge and rupture.

Since 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. Therefore, the added silicone defoamer must be able to quickly spread on the surface of the solution and enter the foam. The bimolecular oriented film will 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 their chemical properties are inert, so simple silicone oil cannot be used as a defoamer, but it can be emulsified to form a silicone defoamer, which can be used on the surface of the solution. It spreads quickly and can achieve a lot of good defoaming effect with a small amount.