Method for synthesizing cationic bleaching activator

The invention discloses a method for synthesizing a cationic bleaching activator, belonging to the technical field of fine chemical engineering. The method comprises the following steps: respectively dissolving 4-chloromethyl benzoyl chloride and lactam in a solvent, dropwisely adding the 4-chloromethyl benzoyl chloride solution into the lactam solution, mixing while introducing ammonia gas, reacting, filtering, and finally adding tertiary amine to react; and after the reaction finishes, carrying out centrifugal drying to remove the solvent, and washing to obtain the solid which is the target product. The method disclosed by the invention greatly simplifies the synthesis technique of the cationic bleaching activator TBLC, lowers the required conditions for synthesizing the cationic bleaching activator TBLC, ensures the higher yield, and is suitable for industrialized popularization.