Method for preparing microcapsule by miniemulsion polymerization

A technology of microcapsules and microemulsions, applied in the preparation of microspheres, microcapsule preparations, etc., can solve problems such as growth and size increase

Inactive Publication Date: 2006-08-09
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the smaller particles disappear and the larger particles increase in size, thus causing a continuous increase in the average particle size

Method used

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  • Method for preparing microcapsule by miniemulsion polymerization
  • Method for preparing microcapsule by miniemulsion polymerization
  • Method for preparing microcapsule by miniemulsion polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0086] All components were mixed according to the composition ratio given in Table 1 below, and added to a microfluidized bed which is a homogenizer to obtain microemulsion particles. The microemulsion particles thus obtained were heated in a polymerization reactor at 65° C. for 5 hours under a nitrogen atmosphere in a batch process to obtain a latex. The properties of the latex thus obtained were analyzed and the results of the analysis are listed in Table 1 below.

Embodiment 4～9

[0092] Embodiment 4~9: prepare microcapsule by adding cross-linking agent in microemulsion polymerization

[0093] [Embodiments 4-9]

[0094] All components except the crosslinking agent were mixed according to the composition ratio given in Table 2 below, and added to a microfluidized bed which is a homogenizer to obtain microemulsion particles. The microemulsion particles thus obtained were heated in a polymerization reactor at 90° C. in a batch process under a nitrogen atmosphere. At this point, a cross-linking agent was added, and the product solution was incubated for 10 hours to obtain a latex. The properties of the latex thus obtained were analyzed and the results of the analysis are listed in Table 2 below.

[0095] category

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

components

(pbw)

Monomer

Styrene

100

100

100

100

100

100

Hydrophilic comonomer

a...

Embodiment 10～12

[0098] Embodiment 10~12: use hydrophilic comonomer core oil-soluble initiator to prepare microcapsules

[0099] [Examples 10-12]

[0100] All components were mixed according to the composition ratio given in Table 3 below, and added to a homogenizer to obtain a microemulsion. The microemulsion thus obtained was heated in a polymerization reactor at 90° C. in a batch process under a nitrogen atmosphere to obtain a latex. The properties of the latex thus obtained were analyzed and the results of the analysis are listed in Table 3 below.

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PUM

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Abstract

Provided is a method for preparing uniformly sized and shaped, mono-dispersed microcapsules using miniemulsion polymerization. In microcapsules prepared by the method, a liquid or solid core encapsulated by a polymer shell has 10 to 80 % by volume of the microcapsules. Since miniemulsion particles produced at an early stage of the method are stable, an organic material which is well dissolved in monomer particles and has a higher interfacial tension with water, relative to the polymer shell, can be uniformly positioned in polymer particles. Furthermore, when a crosslinking agent is added during the polymerization, single-core microcapsules can be obtained. In addition, use of an oil-soluble initiator can prevent formation of secondary particles and addition of a secondary initiator during the polymerization can increase the yield of the uniformly sized and shaped microcapsules.

Description

technical field [0001] The present invention relates to a method for preparing microcapsules by microemulsion polymerization, and more particularly to an initiator comprising mixed monomers, an emulsifier, a superhydrophobe, a hydrophobic substance, preferably an oil-soluble initiator, and deionized water, Processes for the preparation of microcapsules, optionally hydrophilic comonomers and / or used as crosslinkers for auxiliary monomers to prepare microemulsions and polymerize the microemulsions. If necessary, the method may further include adding a second initiator in the microemulsion polymerization to further proceed the microemulsion polymerization. In some cases, crosslinkers can be added to the microemulsion polymerization. The invention also relates to microcapsules prepared by this method. Background technique [0002] Microcapsules have been defined by default as particles ranging from tens of nanometers to tens of micrometers, as opposed to nanocapsules with a pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14C08J3/12C08F2/24
CPCB01J13/14
Inventor 李庆雨郑洋丞河贤哲
Owner LG CHEM LTD
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