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橡塑技术与装备（塑料） CHINA RUBBER/PLASTICS TECHNOLOGY AND EQUIPMENT (PLASTICS)

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Preparation of core-shell polystyrene hollow microspheres

Zhang Xiaohong

(Shaanxi Jintai Chlor-Alkali Chemical Co. LTD., Yulin 718100, Shaanxi, China)
Abstract: In this paper, a new method for preparing large size (millimeter scale) core-shell and hollow
microspheres was studied. PS microspheres were prepared by suspension polymerization, then core-shell
microspheres were coated by adsorption, and hollow microspheres were prepared. The core of this method
was to balance the dissolution of polymer monomers and prepolymers in solvents and the adsorption on the
surface of template polymer, so that the polymer could be coated on the surface of template without serious
swelling of template. The size and shell thickness of microspheres could be adjusted by using different size
templates, monomers with different concentrations and coating times. The optimum technological conditions
for coating large-sized microspheres were: water: 4 mL; SDS: 0.05 g; ethanol: 2 mL; DMSO: 9 mL; temperature:
75℃ ; MMA: 0.6 mL; time: about 90 minutes. The optimum technological conditions for coating small-sized microspheres
were: water: 2 mL; absolute ethanol: 1mL; DMSO: 4.5 mL; SDS: 0.01g; MMA: 0.2 mL; temperature: 75℃ ; time:
about 90 minutes. The optimum technological conditions for suspension polymerization of styrene were as
follows: fixed monomer volume: styrene: 2.0 mL; dispersant: 1.25 g; initiator benzoyl peroxide (BPO): 0.06 g; reaction
temperature: 80℃ ; reaction time: about 90 minutes. The diameter of hollow microspheres ranged from 0.3 to
3 mm.
Key words: hollow microspheres; suspension polymerization; core-shell structure; shell thickness; coating
process
（R-03)

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