In the industrial production process of printing and dyeing, coatings, papermaking, fermentation, oil fields and other industries, a large amount of foam is easy to be produced due to stirring, vibration, boiling and other operations, and if it cannot be effectively controlled, it will bring many troubles to production, such as affecting the production process, reducing the load capacity of equipment, and declining product quality and production capacity. Therefore, the elimination of foam becomes a necessary measure, and the addition of defoamers is a common solution. Polyether silicone defoamers stand out from the crowd and become a good choice.
Among all kinds of defoamers, organosilicon and polyether are the main types, and they are also the main research directions of current researchers. Silicone defoamers have excellent defoaming ability, but the dosage is small and the foaming inhibition ability is not idealHowever, polyether defoamers have strong foam inhibition ability, but the defoaming time is longer and the foaming rate is low.
At present, polyether-modified silicone defoamers mainly combine the advantages of polyether and silicone defoamers by introducing polyether into the polysiloxane side chain. However, the effect of this structure of defoamer is not ideal in some environments where the process conditions are more demanding, such as high-temperature textile dyeing process and fermentation process.
Defoamer manufacturers have found that by adjusting the polymerization degree of polyether ethylene oxide and propylene oxide and the ratio of the two, or adjusting the ratio of polyether to polysiloxane, the antifoaming performance of the product can be changed and the shrinkage porosity of the coating film can be improved. When the proportion of polysiloxane increases, the defoaming and foaming inhibition performance of the product is enhanced, the foaming inhibition time is prolonged, and the high temperature resistance is also improved. However, it is difficult to dissolve in water and has poor resistance to strong alkalis. When the amount of polyether increases, the water solubility of the product increases, and the resistance to strong alkali is also enhanced. If the propylene oxide content in the polyether increases, the antifoaming performance of the product will also be improved.
Based on the above conditions, the defoamer manufacturer prepared a new type of polyether modified silicone defoamer by shearing and emulsifying the base raw materials of self-made silicone paste, double-ended and side-chain partial polyether-modified silicone oil and composite emulsifier. The defoamer has the advantages of high foaming rate, strong defoaming ability and short defoaming time. Secondly, its molecule has a symmetrical structure at both ends, high stability, and acid and alkali resistance. The side chains carry long-chain groups that improve the dispersion of the defoamer. In addition, it has the characteristics of good defoaming ability, foam inhibition ability and centrifuge and thermal stability. At the same time, it has good dispersibility and stability, especially in the acid and alkali resistance under the high temperature system. The preparation process is simple and has good market value.
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