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Polymer nanomicrosphere product with uniform and controllable size and preparation method thereof

A polymer and nano-micro technology, applied in the field of polymer nano-microsphere products and their preparation, can solve the problems of slow preparation speed of emulsion, difficult preparation, large interfacial tension between dispersed phase and microporous membrane, etc. The effect of controllable structure and shape, uniform and controllable size, and fast preparation speed

Inactive Publication Date: 2012-04-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The basic condition for direct membrane emulsification-suspension polymerization to obtain uniform emulsion droplets is that the interfacial tension between the dispersed phase and the surface of the microporous membrane must be large enough. , the preparation speed of the emulsion is very slow, and it is difficult to prepare polymer microspheres with a particle size below 1 μm by this technology

Method used

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  • Polymer nanomicrosphere product with uniform and controllable size and preparation method thereof
  • Polymer nanomicrosphere product with uniform and controllable size and preparation method thereof
  • Polymer nanomicrosphere product with uniform and controllable size and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1 (the aperture of microporous membrane is 2.8 micron, and structure is solid, and monomer is ST)

[0070] The microporous membrane with a pore size of 2.8 μm was placed in deionized water for 30 minutes and then installed in a matching membrane emulsifier for use. Accurately measure 150ml of deionized water, weigh 1.8g of PVA, 0.0003g of SDS and 0.0045g of Na 2 SO 4 and other additives were dissolved in deionized water to form a water phase for later use. 0.5g BPO was completely dissolved in 20g ST to form an oil phase. Add the prepared oil phase into the water phase, and stir at 300 rpm for 10 minutes with mechanical stirring to form a pre-emulsion. Then, the obtained pre-emulsion is quickly poured into the storage tank of the membrane emulsifier, and under a nitrogen pressure of 0.95MPa, it is quickly passed through a microporous membrane with a uniform pore size to obtain an O / W type emulsion with a relatively uniform particle size. The emulsion was u...

Embodiment 2

[0071] Embodiment 2 (the aperture of microporous membrane is 2.8 microns, and structure is microporous, and monomer is ST)

[0072] A microporous membrane with the same aperture as in Example 1 and 150 ml of aqueous phase solution were used, and 10 g of n-heptane (HP) was added to the same oil phase to form an oil phase. Add the prepared oil phase into the water phase, and stir at 300 rpm for 10 minutes with mechanical stirring to form a pre-emulsion. Then, the obtained pre-emulsion is quickly poured into the storage tank of the membrane emulsification device, and under a nitrogen pressure of 1.05MPa, it is quickly passed through a microporous membrane with a uniform pore size to obtain an O / W type emulsion with a relatively uniform particle size. The emulsion was used as a pre-emulsion to pass through the microporous membrane again under the nitrogen pressure of 1.05MPa, and the emulsification was repeated 5 times, and finally an O / W emulsion with uniform particle size was ob...

Embodiment 3

[0073] Embodiment 3 (the aperture of microporous membrane is 2.8 microns, and structure is depression, and monomer is DVB)

[0074] A microporous membrane with the same pore size as in Example 1 was used. Accurately measure 200ml of deionized water, weigh 1.2g of PVA, 0.008g of SDS and dissolve in deionized water to form a water phase for later use. 1.1 g of BPO was completely dissolved in 28 g of DVB, 11 g of hexadecane (HD) to form an oil phase. Add the prepared oil phase into the water phase, and stir at 500 rpm for 10 minutes with mechanical stirring to form a pre-emulsion. Then, the obtained pre-emulsion is quickly poured into the storage tank of the membrane emulsification device, and under a nitrogen pressure of 1.1 MPa, it is quickly passed through the microporous membrane to obtain an O / W type emulsion with a relatively uniform particle size, and the obtained emulsion is used as a pre-emulsion. The emulsion passed through the microporous membrane again under a nitro...

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Abstract

The invention relates to a polymer nanomicrosphere product with uniform and controllable size and a preparation method thereof. The preparation method comprises the following steps: preparing polymerizable olefine monomers, an initiator, assistants and the like into an oil phase, and preparing water, a stabilizer, an emulsifier and the like into a water phase; and mixing the oil phase and water phase into an O / W pre-emulsion, quickly passing the pre-emulsion through a uniform-pore-size microporous membrane under pressure to form a uniform-particle-size O / W emulsion, and polymerizing and curing emulsion droplets in the emulsion into the uniform-particle-size polymer nanomicrospheres. The average particle size of the microspheres can be controlled within the range of tens of nanometers to 50 micrometers, and the particle size distribution coefficient C.V. is smaller than 20%. The method has the advantages of simple steps, favorable batch repetitiveness, uniform and controllable particle size, no need of subsequent screening and the like, is easy to control, can easily implement large-scale production, and therefore, has the characteristics of fewer emissions and low preparation cost.

Description

technical field [0001] The invention relates to a polymer nano-microsphere product and a preparation method thereof, in particular to a polymer nano-microsphere product with uniform size and controllable size and a preparation method thereof, in particular to a polymer with a uniform particle size below 50 microns Nano-microsphere product and preparation method thereof. Background technique [0002] Polymer microspheres have the advantages of good mechanical strength, excellent chemical stability, acid and alkali resistance, and easy modification. They are a very good multifunctional product. In recent years, polymer nano-microspheres have been widely used in many fields such as biomedicine, environment, catalysts, and functional materials, such as drug sustained and controlled release carriers, bioseparation microsphere media, and microsphere reagents for clinical testing. These high value-added applications require uniform and controllable particle size of microspheres, a...

Claims

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Application Information

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IPC IPC(8): C08F2/24C08F2/48C08F112/08C08F112/36C08F212/36C08F212/08C08F220/14C08F220/28
Inventor 巩方玲马光辉闫晓峰苏志国
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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