Polysiloxane is a kind of polymer material developed in the early 20th century. Silicone defoamer is mainly made of polysiloxane with some other additives.


Characteristics of silicone defoamer:


1. Low surface tension. We know that the surface tension of defoamer should be lower than that of foaming system. However, the surface tension of silicone defoamer is lower than that of water, surfactant, aqueous solution and most oils, so its defoaming application is very wide.


2. The solubility of silicone defoamer in water and oil is very low, and it has strong activity. It can be regarded as a surfactant, which can quickly reduce the surface tension of foaming system and achieve defoaming effect.


3. Organic silicon has low volatility and chemical inertness. These two characteristics determine that the defoamer made of silicone can be used in a wide range of temperatures, and its effect will not be compromised for foaming systems at various temperatures.


4. When silicone component is made into defoamer, dimethyl silicone oil is usually the main component, which requires the separation of oligomer. Silicone defoamer itself has a high degree of polymerization. The silicone defoamer with high degree of polymerization has no physiological toxicity and is safe and harmless. It can be used in food, pharmaceutical and medical industries closely related to human body.


The above characteristics show that the silicone defoamer has good defoaming effect, wide foaming system, various temperature foaming system, physiological toxicity, high safety, and can be applied to all types of industries. This determines the important position of silicone defoamer in defoamer.