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Introduction to polyether modified organosilicon defoamer

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Introduction to polyether modified organosilicon defoamer
Polyether modified organosilicon is a polyether siloxane copolymer (referred to as a silicone ether copolymer) prepared by introducing polyether segments into siloxane molecules. Polyether modified organosilicon defoamer is a new and efficient defoamer that combines the advantages of both. It is a defoamer composed mainly of polyether with strong anti foaming ability and dimethyl silicone oil with strong hydrophobicity and rapid defoaming, matched with emulsifiers, stabilizers, and other components that can organically combine silicone oil with polyether. It has the characteristics of low surface tension, rapid defoaming, long foam suppression time, low cost, low dosage, and wide application range. Polyether modification of organosilicon has the advantages of being a second-class defoamer, making it a high-performance and widely applicable defoamer.
In the molecules of silicone ether copolymers, the siloxane segment is an oleophilic group, while the polyether segment is a hydrophilic group. The energy-saving properties of the polyethylene oxide chain in the polyether segment provide hydrophilicity and foaming, while the energy-saving properties of the polyethylene oxide chain provide hydrophobicity and permeability, which have a strong effect on reducing surface tension. The functional groups at the end of polyether chains also have a significant impact on the performance of silicone ether copolymers. Common end groups include hydroxyl and alkoxy groups. Adjusting the relative molecular weight of the siloxane segment in the copolymer can make the copolymer highlight or weaken the characteristics of organic silicon. Similarly, changing the relative molecular weight of the polyether segment will increase or decrease the proportion of organic silicon in the molecule, which will also have an impact on the performance of the copolymer. Polyether modified organosilicon defoamers are easily emulsified in water, also known as self emulsifying defoamers. When above its cloud point temperature, it loses its solubility and mechanical stability in water, and is resistant to acid, alkali, and inorganic salts, making it suitable for defoaming under harsh conditions.
To improve the lipophilicity of water-based inks, coatings, cutting fluids, etc., some methyl groups in the copolymer molecules of polyether modified organosilicon are replaced with long-chain alkyl groups, which can more effectively exert defoaming effects. In order to achieve good defoaming performance below the cloud point temperature, commercial self emulsifying defoamers are usually equipped with dimethyl silicone oil - white carbon black paste. At this point, polyether modified organosilicon surfactants can also act as emulsifiers for dimethyl silicone oil and exert dispersion and emulsification effects at the cloud point temperature

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