Polyether modified organosilicon is a polyether - siloxane copolymer (full name: silica ether copolymer) produced by introducing polyether chain segments into siloxane molecules. Polyether modified silicone defoaming agent is a new kind of high efficiency defoaming agent combining the advantages of the two. It is free to choose polyether with strong anti-foam ability and dimethyl silicone oil with strong hydrophobicity and quick demulsification as the main components, and given the emulsifier, stabilizer and other components that can make silicone oil and polyether organic integration together constitute the defoaming agent. It has the characteristics of low surface tension, fast defoaming, long bubble suppression time, low cost, low dosage and wide application. The modification of organosilicon with polyether has made it a kind of defoamer with excellent performance and broad application prospect.


In the copolymer of silica ether, the siloxane segment is the oil-loving group and the polyether segment is the water-loving group. In the polyether chain segment, the polyoxyethane chain can save energy and obtain hydrophilicity and spontaneous combustion, while the polyoxyethane chain can save energy and obtain hydrophobicity and permeability, which have a strong effect on reducing surface tension. The group at the end of the polyether chain also has a considerable influence on the properties of the silica ether copolymer. Rare end groups include hydroxyl, alkoxy, etc. The relative molecular weight of siloxane in copolymer can be adjusted to make the copolymer attractive or weaken the properties of organosilicon. Similarly, the conversion of the relative molecular mass of polyether segments will reduce or reduce the proportion of organosilicon in the molecule, which will also have an impact on the performance of the copolymer. Polyether modified silicone defoaming agent is more easily emulsified in water, also known as "self-emulsifying defoaming agent". Above the temperature of its turbid point, it loses its solubility in water and its mechanical stability, and it is resistant to acid, alkali and inorganic salts. It can be used for defoaming under severe conditions.


In order to improve the application of hydrophilic ink, coating, cutting fluid, etc., in the copolymer molecules of polyether modified organosilicone, some methyl groups are replaced by long-chain alkyl, which can give full play to the effect of defoaming more effectively. In order to make under the temperature of the cloud point can also have a better defoaming, commercial self-emulsifying defoaming agent is usually equipped with dimethyl silicone oil -- silica black paste, then at the temperature of the cloud point polyether modified organic silicone surfactant can be used as the emulsifier of dimethyl silicone oil and give full play to the concentration, emulsification play.