Modified polyether based defoamer

Polyether is a type of polymer composed of C—O—C bonds. It mainly uses bimetallic catalysts or strong bases as catalysts to embed ethylene oxide (EO), ring on active O—H or N—H bonds. It is formed by propylene oxide (PO) or butylene oxide (BO). Polyethers are mainly used as defoamers to take advantage of the relationship between solubility and temperature. For non-ionic surfactants containing EO, as the temperature increases, the solubility of the polyether in water changes from water-soluble to water-insoluble. When polyether exists in water as a certain size of particles, it meets the characteristics of a defoamer that is "insoluble in the foaming medium". Therefore, it can act as a defoamer in certain media at this time, especially Some industries and fields that cannot use silicone as a defoamer, such as steel plate cleaning, circuit board cleaning, paper industry, etc. However, in many practical situations, the defoaming ability of polyether is not enough, and the actual defoaming temperature varies widely. At this time, the polyether defoamer polyether exhibits obvious defects. Therefore, it is necessary to modify the polyether. The general modification method is to use an active group to react with the hydroxyl group on the polyether structure. The unit reactions involved are mainly esterification and condensation reactions. Modified substances include fatty acids, coupling agents, fatty alcohols, and the like.

The modified polyether defoamer has a wider scope of application and better effect, can eliminate excess large bubbles in the concrete, make the appearance of the concrete more beautiful, and at the same time reduce the gas content of the polycarboxylic acid water reducer, improve The structure and compactness of the concrete pores.

Amber Zhang Ms.

Foreign trade 

Zhejiang Ruico Advanced Materials Co., Ltd. (Stock No.873233)

Add: No.188, Liangshan Road, Linghu Town, Nanxun District, Huzhou City, Zhejiang Province, China 313018

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