Hyperbranched polyether modified organic silicon defoaming agent with efficient foam inhibition performance and preparation method thereof
A silicone defoamer, hyperbranched polyether technology, applied in chemical instruments and methods, separation methods, foam dispersion/prevention, etc., can solve the problems of limited application, unsatisfactory shear resistance, etc. Generation, excellent shear resistance, the effect of simple production process
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[0024] A hyperbranched polyether-modified silicone defoamer with high foam suppression performance, consisting of the following parts by weight (kg) of raw materials: polysiloxane 33, hyperbranched polyether 19, allyl glycidyl ether 23, Propylene oxide 54, double metal cyanide complex 0.4, isopropanol 60, chloroplatinic acid catalyst 0.4, ultrafine aluminum silicate 4, sorbitol 1, Tween 60 2, sodium carboxymethyl cellulose 3, An appropriate amount of deionized water, nonylphenol polyoxyethylene ether 3, triphenylmethane 2, polyethylene glycol 2.
[0025] Specific steps are as follows:
[0026] (1) Preparation of allyl-terminated hyperbranched polyether:
[0027] The hyperbranched polyether and double metal cyanide complex are added to the autoclave, evacuated and dehydrated, and replaced with nitrogen for 3 times. After the temperature is raised to 120°C, 2 / 3 parts of propylene oxide is introduced to control the temperature of the reaction process At about 135°C, when the pressure ...
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