Preparing method for mud stopping agent used for compound polycarboxylate superplasticizer

The invention discloses a preparing method for a mud stopping agent used for compound polycarboxylate superplasticizer. The preparing method includes the following steps that reaction monomer unsaturated alcohol or a derivative thereof, dimethyl diallyl ammonium chloride and water are selected and added into reaction equipment to prepare a reaction solution, or reaction monomer acrylamide or a derivative thereof, unsaturated alcohol or a derivative thereof, dimethyl diallyl ammonium chloride and water are selected and added into reaction equipment to prepare a reaction solution, the temperature of the reaction solution is adjusted to be 50 DEG C-60 DEG C, a copolymerization reaction is conducted for 3-4 h in a stirred mode under the action of an initiating agent, after the reaction is completed, the pH value of the reaction solution is adjusted by an alkaline solution to be 6-8, and then polymeric aluminum chloride or polymeric zirconium chloride is added for complexing to obtain the mud stopping agent used f