Polycarbonate preparation method

A method for preparing a polycarbonate, wherein a continuous two-phase interfacial polycondensation process is utilized, the method comprising:

• a) mixing a phenoxide aqueous solution of a bisphenol with a phosgene and an inert organic solvent in a mixing reactor, reacting and generating a polycarbonate oligomer having an average polymerization degree of from 1 to 20;
• b) highly emulsifying the oligomer obtained in step a) by reinforced micromixing to form a stable water-in-oil emulsion, in which the average droplet diameter of the dispersed phase in the emulsion is less than 300 μm;
• and
• c) introducing the stable emulsion obtained in step b) into a polycondensation reactor for a chain extending reaction to form a high-molecular-weight polycarbonate solution, finally demulsifying and purifying the reaction solution, thereby obtaining a polycarbonate resin.