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Process for preparing microcapsule by initiating active fine emulsion polymerization of water-soluble initiating agent

A water-soluble initiator, a technology of mini-emulsion polymerization, applied in the field of emulsion polymerization, can solve the problems of difficult to maintain stability of the dispersion system, poor regulation of the capsule wall formula, complicated process, etc., and achieve precise and controllable structure, regular shape, and heat transfer effect. Good results

Inactive Publication Date: 2007-11-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing microencapsulation method can generally obtain micron to millimeter-sized capsules. Because the particles are too large, the dispersion system is difficult to maintain stability, so it needs to be re-dispersed into latex during use, which is not only cumbersome in process, but also consumes a lot of energy. Large and poorly regulated capsule wall formula

Method used

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  • Process for preparing microcapsule by initiating active fine emulsion polymerization of water-soluble initiating agent
  • Process for preparing microcapsule by initiating active fine emulsion polymerization of water-soluble initiating agent
  • Process for preparing microcapsule by initiating active fine emulsion polymerization of water-soluble initiating agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] 1) Mix 4 grams of 22°C phase change material, 0.5 grams of oligomer RAFT (1) and 16 grams of styrene to form an oil phase solution under magnetic stirring;

[0040] 2) adding 0.5 gram of ammonia solution (5% by mass) to 75 grams of water to form an aqueous phase solution;

[0041] 3) Mix the above oil phase solution and water phase solution, stir magnetically at 60°C for 30 minutes, and then use Ningbo Kesheng KS-600 ultrasonic pulverization for 15 minutes (70% output power);

[0042] 4) Move the fine emulsion into a reactor equipped with a mechanical stirring condensing reflux device, a nitrogen inlet, and a feeding port. After 30 minutes of deoxygenation with nitrogen, add a 68 ° C water bath, and simultaneously add an aqueous solution of potassium persulfate (0.16 g dissolved in 5 g water) to initiate polymerization, after the polymerization is completed, slowly cool to room temperature and discharge.

Embodiment 2

[0044] 1) Add 4 grams of 26°C phase change wax and 0.7 grams of oligomer RAFT (2) to 16 grams of hydroxyethyl methacrylate and 0.2 grams of ethylene glycol dimethacrylate mixture, and mix under magnetic stirring Uniform, forming an oil phase solution;

[0045] 2) Add 0.1 gram of sodium lauryl sulfate and 0.5 gram of ammonia solution into 75 grams of water, stir with slight heat to form a uniform aqueous phase solution;

[0046] 3) Mix the above oil phase solution and water phase solution, stir magnetically at 60°C for 30 minutes, and then use Ningbo Kesheng KS-600 ultrasonic pulverization for 15 minutes (70% output power);

[0047] 4) Move the fine emulsion into a reactor equipped with a mechanical stirring condensing reflux device, a nitrogen inlet, and a feeding port. After 30 minutes of deoxygenation with nitrogen, add a 68 ° C water bath, and simultaneously add an aqueous solution of potassium persulfate (0.16 g dissolved in 5 g water) to initiate polymerization, after th...

Embodiment 3

[0049] 1) Add 10 grams of 26°C phase change wax and 1.2 grams of oligomer RAFT (3) to the mixed monomer of 6 grams of styrene and 4 grams of methyl methacrylate, and mix evenly under magnetic stirring to form a uniform oil solution;

[0050] 2) Add 0.2 gram of sodium lauryl sulfate and 0.8 gram of ammonia solution (5%) into 75 grams of water, stir with slight heat to form a uniform aqueous phase solution;

[0051] 3) Mix the above oil phase solution and water phase solution, stir magnetically at 60°C for 30 minutes, and then use Ningbo Kesheng KS-600 ultrasonic pulverization for 15 minutes (70% output power);

[0052] 4) Move the fine emulsion into a reactor equipped with a mechanical stirring condensing reflux device, a nitrogen inlet, and a feeding port. After 30 minutes of deoxygenation with nitrogen, add a 68 ° C water bath, and simultaneously add an aqueous solution of ammonium persulfate (0.18 g dissolved in 5 g water) to initiate polymerization, after the polymerizatio...

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Abstract

A process for preparing microcapsule by fine emulsion polymerizing include such steps as mixing phase-transition material with one or more vinyl or polyvinyl monomers, adding amphiphilic chain transfer to become oil solution, dispersing it in alkaline aqueous solution, pre-emulsifying, stearing to become fnie emulsion, adding water-soluble trigger, and triggered polymerizing.

Description

technical field [0001] The invention relates to emulsion polymerization, in particular to a method for preparing microcapsules by a water-soluble initiator initiating an active miniemulsion polymerization method. Background technique [0002] A phase change material is a substance that can undergo solid, liquid, and gas phase transitions. It has a huge latent heat of phase change and can absorb, store or release a large amount of heat at a substantially constant temperature (ie, phase transition temperature). According to the phase change form and phase change process, phase change materials are mainly divided into solid-solid phase change, solid-liquid phase change, liquid-gas phase change, and solid-gas phase change energy storage materials; according to the phase change temperature range, they can be divided into high and medium , Low-temperature phase change materials; according to their composition, they can be divided into inorganic and organic (polymer) phase change m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F20/00C08F12/08C08F2/26C08F2/44B01J13/14
Inventor 顾红艳罗英武李宝芳
Owner ZHEJIANG UNIV
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