The invention discloses a preparation method of
polymer particle, which comprises that suspends monodisperse and swelling seed
polymer particles with a first preset value of
mass into a water solution containing stabilizer and surface activator, mixes polymerisable
monomer with
mass of second preset value and initiator with
mass as third preset value, to be added into
monomer solution at polymerisable temperature, to process reaction, while the reaction degree is controlled at 30-98%, adjusts temperature, adds reactant, swells, while the reactant contains a polymerisable
monomer with mass of fourth preset value or a second crosslinkable monomer with mass of fifth preset value, and an initiator with mass of sixth preset value, heats to polymerisable temperature, to process
polymerization. The inventive microballoon has better monodispersity, high yield, reaction
reproduction support, reduced production cost, and controllable product shape and property, while the invention can prepare porous monodisperse microballoon product.