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Apr 27, 2017
Polyether-modified silicone oil at atemperature above its cloud point lost in solubility in water, and can exertanti-foaming, and on dimethyl silicone has a very good ability to emulsify. Thepolyether-modified silicone oil silica silicone paste composition, dubbeddefoamers have good storage stability and dispersibility in water systems. Suchdefoamers commonly referred to as self-emulsifying defoamer. Suchself-emulsifying silicone defoamers defoaming ability and very good defoamingpersistence. And heat resistance, mechanical stability, acid resistance, alkaliresistance and good resistance to salt type can also be used under extremeconditions emulsion silicone defoamers can not be used.
Self-emulsifying formulation of siliconedefoamers, defoamer is prepared to adapt to a variety of foaming system, themost important condition is to choose the suitable structure of polyethermodified silicone oil and silicone oil suitable silica cream. By the use of aformulation of polyether modified silicone oil, the polyether-modified siliconeoil 1% aqueous solution of cloud point of not less than 40 ℃, preferablygreater than 60 ℃. When the cloud point below 40 ℃, defoamersformulated high temperature stability is not good.
White carbon black silicone paste configuration,substantially the same as the emulsion defoamer. Use branched wash dimethiconeor silicone oil with a cross-linked structure can be increased and theanti-foaming effect defoaming persistence. In addition to these two essentialingredients, other additives may also be added. Polyether emulsifying aid canbe formulated defoamers and viscosity decreased to improve waterdispersibility.