Method for preparing suspended polymerization toner

The invention provides a method for preparing a suspended polymerization toner. The method comprises the following steps of: preparing aqueous dispersion of a wax coated coloring agent with the average particle size of less than 1 micron; adding coloring agent-wax aqueous dispersion into a monomer oil phase for performing pushing process and inversing phase, so that coloring agent-wax particles are transferred from an aqueous phase to the monomer oil phase containing a charge control agent; stirring and blending in suspended dispersion containing electrolytes, so that residual partial coloring agent-wax particles are completely transferred from the aqueous phase to oil particles; performing high-speed shearing suspended granulation, raising the temperature and polymerizing to convert the monomer oil particles into polymer particles, cleaning, filtering, drying and externally adding silica to obtain the polymerization toner. By the method, dispersion uniformity and stability of the wax and coloring agent are improved; therefore, the suspended polymerization toner in sharp particle size distribution is obtained, and charge and environmental stability of the toner are improved.