Polyether defoaming agent for oil well cement and processing and stirring device thereof

The invention relates to the technical field of defoaming agents, in particular to a polyether defoaming agent for oil well cement, which comprises the following components in percentage by mass: polysiloxane, polypropylene oxide ether, mineral oil, white carbon black, tributyl phosphate, silicon dioxide, an emulsifier, a dispersant, a stabilizer, a reinforcing agent and a modified flowable agent, the invention further relates to a processing and stirring device for producing the polyether defoaming agent for oil well cement, the processing and stirring device comprises a stirring barrel, a discharging pipe is fixedly arranged at the lower end of the stirring barrel, a cross-shaped mounting frame is fixedly arranged at the upper end of the stirring barrel, and an electric telescopic rod is fixedly arranged in the center of the upper end of the cross-shaped mounting frame; a driving disc body is fixedly mounted at the lower end of the electric telescopic rod, a guide insertion hole is formed in the driving dis