Double-end-blocked polyether modified silicone-oil defoaming agent and method for preparing same

The invention discloses a double-end-blocked polyether modified silicone-oil defoaming agent and a method for preparing the same. The method comprises the following steps of: stirring and mixing double-end-blocked polyether modified silicone oil, white oil, polyethylene glycol and dodecanol, and heating to obtain a double-end-blocked polyether modified silicone-oil mixture; stirring the double-end-blocked polyether modified silicone-oil mixture and a compound emulsifier, adding a compound stabilizer and hot water gradually, and continuing to stir; cooling to room temperature gradually while stirring, and filtering to obtain the double-end-blocked polyether modified silicone-oil type defoaming agent. The invention also discloses a method for preparing a double-end-blocked polyether modified silicone oil, and the method comprises the following steps of: mixing silicone oil, an initiator and a catalyst, and removing matters with low boiling points and water in vacuum; filling nitrogen to substitute, and introduc