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Jan 10, 2018
Polyether modified silicone, polyether segment is introduced into the siloxane molecules obtained polyether - siloxane copolymer (referred to as silicone ether copolymer). Polyether modified silicone defoamer is the combination of the advantages of both a new type of highly efficient defoamer. It is the choice of polyether with strong anti-foam ability and strong hydrophobic, rapid breaking silicone oil as the main component, matching silicone oil and polyether can be combined with emulsifiers, stabilizers and other ingredients Bubble. It has a low surface tension, rapid defoaming, a long time foam suppression, low cost, less dosage, wide range of applications. Polyether modified silicone to make it has the advantages of two types of defoamers, to become a good performance, a wide range of applications defoamers.
In the molecule of the silicone ether copolymer, the silicone segments are lipophilic and the polyether segments are hydrophilic. Polyethylene oxide chains in polyether segments provide energy savings in hydrophilicity and foaming, and energy-efficient polyethylene oxide chains provide hydrophobicity and penetration, which have a strong effect on reducing surface tension. Polyether chain end groups on the performance of silicone copolymers also have a great impact. Common terminal groups are hydroxyl, alkoxy and so on. Adjusting the relative molecular mass of the siloxane segments in the copolymer allows the copolymer to highlight or diminish the properties of the silicone. Similarly, changing the relative molecular mass of the polyether segment will increase or decrease the proportion of silicone in the molecule, affecting the properties of the copolymer as well. Polyether modified silicone defoamers are easily emulsified in water, also known as "self-emulsifying defoamers." Its cloud point above the temperature, the loss of water solubility and mechanical stability, and acid, alkali and inorganic salts, can be used for defoaming under harsh conditions.
In order to improve the lipophilicity of water-based inks, coatings, cutting fluids and so on, the partial methyl groups in the polyether-modified silicone copolymer molecules are replaced by long-chain alkyl groups, so that the defoaming effect can be effectively exerted. In order to make the cloud point temperature below also have good defoamability, commercial self-emulsifying defoamers are usually equipped with dimethyl silicone oil --- white carbon black paste, then at the cloud point temperature Polyether modified silicone surfactants can also play a role as a dispersion of dimethyl silicone emulsifier, emulsification.