In the industrial production process of petroleum, rubber, paint, textile, etc., if there is a large amount of foam, it will not only be inconvenient for production and operation, waste equipment capacity, but also affect the quality of the product. Therefore, it is necessary to effectively control the foam in the production process. Generally, the elimination of foam can be achieved by high-speed centrifugation, decompression, ultrasound and other physical methods. However, under the condition that the scale of industrial production is getting bigger and bigger and the production efficiency is getting higher and higher, it is necessary to quickly and effectively eliminate the continuously generated foam in the shortest time possible, and it is necessary to use new and more effective methods. .

After the active ingredients formed by dimethyl silicone oil and fumed silica in the silicone defoamer are added to the foam system, because the active ingredients have low surface activity, they are quickly distributed on the liquid surface, preventing the formation of a new elastic film. That is, the generation of bubbles is terminated. On the other hand, the active ingredient spreads on the surface of the foam elastic film, further diffuses and penetrates on the surface of the film, so that the film wall becomes thinner rapidly, which destroys the balance and stability system of the foam. resulting in bubble breakage. The defoamer molecules insoluble in the system re-enter the surface of another foam film, and so on, all foams are completely destroyed.

At present, there are many varieties and models of silicone antifoaming agents at home and abroad, with different properties. Generally, they can be divided into oil (ointment) type, solution type, emulsion type, solid type and modified silicone oil type.

Silicone defoamer not only has good defoaming and anti-foaming effects, but also has the characteristics of low dosage, good chemical inertness, and can play a role in harsh conditions. In recent years, it has developed rapidly, and new varieties and models suitable for different use environments Continue to produce, the application surface is also constantly expanding. In the future, new high-efficiency silicone defoamers with strong applicability and can further improve product quality and equipment utilization will be further developed, especially polyether-modified silicone defoamer and emulsion type defoamer with excellent performance. The market occupies a dominant position.