Method for preparing composite membrane by ultrasonic spraying method

The invention discloses a method for preparing a composite membrane by an ultrasonic spraying method, and belongs to the technical field of membrane preparation. Dissolving a polyamine water-phase monomer in water to obtain a water-phase solution; dissolving an acyl chloride monomer in an organic solvent to obtain an oil phase solution; respectively atomizing the water phase solution and the oil phase solution into micro-nano liquid drops by adopting an ultrasonic spraying method, sequentially and alternately spraying the micro-nano liquid drops onto a porous substrate membrane, and finally carrying out heat treatment. According to the method, the micro-nano phase interface is constructed by utilizing an ultrasonic atomization technology, so that a polymerization reaction based on the micro-nano phase interface is realized, the monomer diffusion speed and the reaction contact area are effectively controlled, and ultrathin and controllable preparation of a compact defect-free cortex is realized. The preparatio