The modified silicone oil introduces methyl silicone oil with a part of hydrophilic polyether segment, which can be turned into a self-emulsifying defoamer, which can maintain dispersion for a long time in the foaming system and prolong the service life of the defoamer. Modified silicone oils currently used as defoamers include polyether silicone oils, fluorohydrocarbon-based silicone oils, and long-chain alkyl silicone oils. Their applications and effects are remarkable.

End group, side group and branched polyether silicone oils can be used as defoamers. They all have a clear cloud point. Only above the cloud point, they have a strong defoaming property, and below the cloud point, they contribute to the foaming effect. In addition, using the strong emulsifying ability of polyether silicone oil and silicon paste, it can self-emulsify into a stable and efficient defoamer in water system. It has been widely used as polyester fiber high temperature dyeing, various lubricants, cutting Defoaming of oil, antifreeze and strong acid systems.

Long chain alkyl silicone oil defoamer can be used in the fields of fermentation, food ding, medical, textile, petroleum, synthetic rubber and resin, coatings and inks. Due to its good affinity for organic materials, the long-chain alkyl silicone oil defoamer will not affect the post-processing properties of the product. However, its surface tension increases with the increase of carbon chain, and the defoaming performance decreases accordingly. Therefore, it is important to choose a suitable carbon chain length. Long chain alkyl silicone oil is used in defoaming of non-aqueous systems and water systems.

The surface tension of fluorocarbon-based silicone oil is lower than that of other silicone oils. Therefore, the defoamer formulated by it is more effective in reducing the surface tension of various foaming systems, and the effect is better than other silicone oil defoamers. It is mainly used in non-aqueous foaming medium with strong solubility in methyl silicone oil or methylphenyl silicone oil, such as aliphatic hydrocarbons, aromatic hydrocarbons and naphtha.

Organosilicon defoamers not only have good defoaming and antifoaming effects, but also have low dosage, good chemical inertness, and can play a role in harsh conditions. In recent years, they have developed rapidly and are suitable for different types of new environments and new models. Constantly produced, the application area is also constantly expanding. In the future, new high-efficiency silicone defoamers with strong applicability that can further improve product quality and equipment utilization rate will be further developed, especially polyether-modified silicone defoamers and emulsion defoamers with excellent performance. The market occupies a major position.