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Silicone defoamer type introduction

发布时间：2024-07-04

Polyether modified silicone is a polyether-siloxane copolymer (referred to as silicone ether copolymer) made by introducing polyether segments into siloxane molecules. Polyether modified silicone defoamer is a new type of high efficient defoamer which combines the advantages of both. It is a defoamer composed of polyether with strong anti-foam ability and dimethyl silicone oil with strong hydrophobicity and rapid bubble breaking as the main components, and is matched with emulsifiers, stabilizers and other components that can make silicone oil and polyether organically combine. It has the characteristics of low surface tension, rapid defoaming, long foam suppression time, low cost, low dosage, and wide application. Silicone is modified by polyether, which has the advantages of the second type of defoaming agent, and becomes a defoaming agent with excellent performance and broad application prospects.

In the molecule of the silyl ether copolymer, the siloxane segment is a lipophilic group and the polyether segment is a hydrophilic group. Polyether chain segment of polyethylene oxide chain energy saving to provide hydrophilic and foaming, polyethylene oxide chain energy saving to provide hydrophobic and osmotic force, to reduce the surface tension has a strong role. The group at the end of the polyether chain also has a great influence on the properties of the silicone ether copolymer. Common terminal groups are hydroxyl, alkoxy, etc. By adjusting the relative molecular mass of the siloxane segment in the copolymer, the copolymer can be made to highlight or weaken the characteristics of the silicone. Similarly, changing the relative molecular mass of the polyether segment will increase or decrease the proportion of silicone in the molecule, which will also affect the performance of the copolymer. Polyether modified silicone defoamer is easy to emulsify in water, also known as "self emulsifying defoamer". Above its cloud point temperature, it loses its solubility in water and mechanical stability, and is resistant to acids, alkalis and inorganic salts, and can be used for defoaming under harsh conditions.

In order to improve the lipophilicity for use in water-based inks, paints, cutting fluids and the like, a part of methyl groups in the copolymer molecule of polyether-modified silicone is replaced with a long-chain alkyl group, so that the defoaming effect can be more effectively exerted. In order to make the cloud point temperature below can also have better defoaming, commercial self-emulsifying defoamers are usually equipped with dimethyl silicone oil-white carbon black paste, then in the cloud point temperature polyether modified silicone surfactant and can be used as an emulsifier of dimethyl silicone oil to play a dispersion, emulsification.

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