The invention discloses
polymer hollow nano microspheres and a preparation method thereof. The preparation method is characterized by comprising the following steps: adding 10-200 parts by weight of
polymer A, 0-200 parts by weight of additive and 100-1000 parts by weight of
solvent A into a dissolving kettle provided with a stirrer and a
thermometer, dissolving by stirring at 30-100 DEG C, debubbling, and aging to obtain a
polymer shell solution; adding 0-400 parts by weight of polymer B and 100-1000 parts by weight of
solvent B into a dissolving kettle provided with a stirrer and a
thermometer, dissolving by stirring at 30-100 DEG C, debubbling and aging to obtain a core solution; putting the polymer shell solution and the core solution in a high-
voltage electrostatic field, and carrying out electrostatic spraying by a coaxial electrostatic
sprayer to obtain polymer microspheres, wherein the inner
diameter of the needle head of the core is 0.4-0.6mm, the
solution flow rate is 1-5ml / h, the inner
diameter of the needle head of the shell is 0.9-1.2mm, the
solution flow rate is 5-10ml / h, the spraying
voltage is adjusted to 5-25kV, the spraying distance is 1-10cm, and the temperature of the receiving bath is 10-50 DEG C; and removing core substances of the microspheres to obtain the polymer hollow nano microspheres.