Micron-sized cross-linked polymer hollow microspheres and preparation method for same

Abstract

The invention discloses micron-sized cross-linked polymer hollow microspheres and a preparation method for the same, and belongs to the field of polymer microsphere materials. A micro-suspension polymerization method is used for preparing the micron-sized cross-linked polymer hollow microspheres. The preparation method comprises the following steps of dissolving a dispersant and a second dispersant into water, then adding a mixed solution of an initiator, various monomers, a pore-forming agent and a co-stabilizer into an aqueous phase, performing pre-emulsification with high-speed stirring, raising temperature for polymerization with low-speed stirring, adding a cross-linking agent after reaction for a certain time, continuing performing reaction for a certain time, and centrifugally washing and drying products to obtain the cross-linked polymer hollow microspheres after reaction is finished. The hollow microspheres prepared by the method have large particle sizes and the advantages of low density, high light scattering performance, large specific surface area, high thermal insulating property and the like, and are widely applied to the fields of lightweight fillers, high-performance opaque coatings, microcapsules, leather and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of micron-scale crosslinked polymer hollow microspheres. Background technique [0002] Polymer hollow microspheres are a kind of functional microsphere materials with special properties. Compared with solid microspheres, polymer hollow microspheres have the advantages of low density and high specific surface area due to their internal cavity structure, and polymer hollow microspheres The refractive index of the inner cavity of the microsphere is different from that of the shell layer. After the light enters, it will be refracted multiple times in it, so that it has excellent light scattering performance, heat insulation, sound absorption and light covering performance. Performance Blackout coatings, microcapsules, leather and other fields are widely used. At present, there are many methods for preparing polymer hollow microspheres. Among them, in...

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Problems solved by technology

At present, there are many methods for preparing polymer hollow microspheres. Among them, in the 1980s, Kowalski et al. reported the use of alkali swelling emulsion method to prepare polymer hollow microspheres in the patent US Patent 4427836, and this method has been industrialized, but the method There are disadvantages such as complicated steps and small particle size of prepared hollow microspheres

In the patent CN200710132704 (disclosure date: February 20, 2008), a preparation method of nano-scale cross-linked polystyrene hollow microspheres is disclosed. Divinylbenzene, hydrophobic organic matter and oil-soluble initiator are mixed and then added to the water phase containing emulsifier and co-emulsifier. After pre-emulsification, the temperature rises and polymerizes under stirring to obtain cross-linked styrene hollow microspheres. The process is simple , but the size of hollow microspheres is at the submicron level, which limits the wider application of hollow microspheres

Okubo et al. prepared micron-sized hollow microspheres by a dynamic swelling method. This method first prepared polystyrene seed microspheres, and then added them to an ethanol solution of toluene and divinylbenzene, and slowly added water to make the toluene and divinylbenzene swell into the seed microspheres, and finally initiate polymerization to obtain polymer hollow microspheres. Although the hollow microspheres prepared by this method reach the micron level, the yield of the hollow microspheres is too low, and the reaction takes too long

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