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Preparation method of surface cationic polystyrene microsphere

A technology of polystyrene microspheres and cations, applied in the field of materials, can solve the problems of polystyrene microspheres containing positively charged quaternary ammonium groups, wide particle size distribution range, single surface function, etc., to achieve good monodispersity, particle size The effect of narrow diameter distribution and simple preparation process

Active Publication Date: 2019-04-26
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent application 201110327414.1 discloses a preparation method of monodisperse cationic polystyrene microspheres with controllable particle size. In this method, styrene is treated, reacted with an initiator and a polymerizable dispersion stabilizer, and then washed to obtain , the particle size range of the obtained microspheres is 100-1000nm, the polystyrene microspheres prepared by this method can only be used as a carrier, the function is relatively single, and the particle size distribution range is wide;
[0007] Chinese patent application 200710098739.0 discloses a method for preparing monodisperse polystyrene microspheres with controllable particle size. After the method handles styrene, water and polyvinylpyrrolidone (as a stabilizer) are added to mix evenly, and then Potassium persulfate (as an initiator) is added, and then washed to obtain the obtained microspheres. The particle size range of the obtained microspheres is 250-1400nm. The patent is to control the particle size by adjusting the concentration of the dispersant polyvinylpyrrolidone, and using a water-soluble initiator. The surface function of polystyrene functional microspheres can only be used as a carrier, and there is still a defect that the surface function is too single
[0008] The prior art discloses that if there are positively charged quaternary ammonium groups on the surface of polystyrene microspheres, it can have antibacterial and other functions, thereby realizing the functionalization of microspheres. However, there is no good way to realize polystyrene microspheres in the prior art. Positively charged quaternary ammonium groups on the surface of the microspheres

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  • Preparation method of surface cationic polystyrene microsphere
  • Preparation method of surface cationic polystyrene microsphere
  • Preparation method of surface cationic polystyrene microsphere

Examples

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Embodiment 1

[0048] The present embodiment provides a kind of preparation method of preparing cationic polystyrene microsphere, comprises the AEO-9 of 2.0g PVPK30 (being the polyvinylpyrrolidone of K value 30) and 0.40g, 80g ethanol and 20g water are added to In a 250ml four-neck flask equipped with a condenser tube, a thermometer, stirring and a nitrogen tube, adjust the appropriate stirring speed, heat up the water bath to 60°C, and dissolve azobisisobutyronitrile with a monomer mass ratio of 1.5% in 10g of styrene monomer In, the polymerization reaction occurs;

[0049] After two hours of polymerization, use a balance funnel to slowly add 10 mL of an ethanol aqueous solution of methacryloyloxydodecyldimethylammonium bromide with a concentration of 0.201 mol / L. The dropping time is controlled at 20-30 minutes, and the constant temperature is continued. Polymerization 10h;

[0050]After the reaction, the reaction system was cooled to room temperature, the microspheres were fully washed w...

Embodiment 2

[0052] This embodiment provides a kind of preparation method of preparing cationic polystyrene microspheres, the AEO-9 of the PVPK30 of 2.0g and 0.40g, 80g ethanol and 20g water are added to condenser pipe, thermometer, stirring and nitrogen pipe are housed In a 250ml four-neck flask, adjust the appropriate stirring speed, raise the temperature of the water bath to 61°C, dissolve azobisisobutyronitrile with a monomer mass ratio of 1.5% in 10g of styrene monomer, and polymerize;

[0053] After two hours of polymerization, use a balance funnel to slowly add 10 mL of an ethanol aqueous solution of methacryloyloxydodecyldimethylammonium bromide with a concentration of 0.402 mol / L, and the dropping time is controlled at 20-30 minutes. Polymerization at 60°C for 10h;

[0054] After the reaction, the reaction system was cooled to room temperature, the microspheres were fully washed with 95% ethanol and suction filtered to remove the dispersant on the surface, and dried to constant we...

Embodiment 3

[0056] This embodiment provides a kind of preparation method of preparing cationic polystyrene microspheres, the AEO-9 of the PVPK30 of 2.0g and 0.40g, 80g ethanol and 20g water are added to condenser pipe, thermometer, stirring and nitrogen pipe are housed In a 250ml four-neck flask, adjust the appropriate stirring speed, raise the temperature of the water bath to 59°C, dissolve the initiator azobisisobutyronitrile with a monomer mass ratio of 1.5% in 10g of styrene monomer, and polymerize;

[0057] After two hours of polymerization, use a balance funnel to slowly add 10ml of an ethanol aqueous solution of methacryloyloxydodecyldimethylammonium bromide with a concentration of 0.603mol / L, and the dropping time is controlled at 20-30min. Polymerization at ℃ for 10h;

[0058] After the reaction, the reaction system was cooled to room temperature, the microspheres were fully washed with 95% ethanol and suction filtered to remove the dispersant on the surface, and dried to constan...

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Abstract

The invention discloses a preparation method of a surface cationic polystyrene microsphere and belongs to the technical field of materials. The method comprises the steps as follows: styrene is used as an initial monomer, ethyl alcohol / water is used as a mixed dispersion medium, an initiator and a dispersant are added, a reaction is conducted in a nitrogen atmosphere, then, a cationic functional monomer and an ethyl alcohol / water medium mixture are added, the reaction is conducted continuously, washing and drying are performed after the reaction, and the surface cationic polystyrene microsphere is obtained. The system has better stability and Zeta potential values are all +25 mV or above; the preparation process is simple, the prepared functional polystyrene microsphere has good monodispersity, the particle size of the microsphere is controllable, efficient enrichment of surface functional groups of the microsphere can be realized, and the prepared microsphere has narrow particle sizedistribution and has variation coefficient of 0.6% or below.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing surface cationic polystyrene microspheres. Background technique [0002] Cationic polystyrene microspheres are an important functional material. Since the surface of the microspheres is positively charged, they can contact the cell membrane to kill bacteria. They are widely used in many fields, such as catalysts, coatings, and food packaging. [0003] At present, the method for preparing cationic polystyrene microspheres mainly adopts emulsion polymerization, soap-free emulsion polymerization and the like. [0004] Among them, the emulsion polymerization method requires the use of emulsifiers. Although the stability of the polymerization reaction is improved, the emulsifiers will be adsorbed to the surface of the polymer particles or wrapped inside during the polymerization process, which is difficult to meet the requirements for the purity of the polymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/34A01N37/12A01N27/00A01P3/00A01P1/00C07C213/08C07C219/08
CPCA01N27/00A01N37/12C07C213/08C08F212/08C08F220/34C07C219/08
Inventor 吕珊珊蒋文伟李晶晶
Owner SICHUAN UNIV
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