Self-emulsifying polyether silicone oil defoamer is a self-emulsifying new high-efficiency composite silicone defoamer with white carbon black silicone grease and polyether modified silicone oil as active ingredients and other additives. Polyether modified silicone oil has strong emulsifying ability, can emulsify silicone oil and self-emulsifying, making the whole emulsion system very stable; due to the low surface tension of polysiloxane and the easy dispersibility of polyether, defoaming The agent is easy to disperse and spread; it has defoaming property above the cloud point temperature, and is dispersed in the foaming liquid below the cloud point temperature to make the defoaming last. Due to the coordination effect of each component, the applicability of the defoaming agent is improved, and it has the characteristics of high temperature resistance, acid and alkali resistance, mechanical stability, wide application range, low dosage, high efficacy and long-lasting defoaming, and is widely used for printing and dyeing. In the fields of papermaking, pharmaceutical, paint, petroleum, chemical, etc., it is especially suitable for the harsh foaming liquid which is difficult for general silicone oil emulsion, such as defoaming in polyester fiber fabric high temperature dyeing process, defoaming of diethanolamine aqueous solution desulfurization system, Defoaming of various oils, cutting fluids, and antifreeze systems.
Example of self-emulsifying polyether defoamer for dyeing: (containing active substance 100%)
Polyether silicone oil: hydrosilation reaction with low hydrogen-containing silicone oil (0.18%) and single-end allyl polyether (EO:PO=4:6) under N2 gas protection at 80-100 ° C, Pt complex catalysis , light yellow modified polyether silicone oil. Polyether modified silicone oil 650g white carbon black silicone paste (ibid.) 150g allyl polyether (EO: PO = 1:1) 150g