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A method for preparing phase-change microcapsules by soap-free emulsion polymerization

A technology of soap-free emulsion polymerization and phase change microcapsules, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve problems that have not been seen, and achieve simple preparation process, constant phase change temperature, and large application value effect

Active Publication Date: 2018-10-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the synthetic method of reported phase-change microcapsules, emulsion polymerization is used to obtain polymethyl acrylate (PMMA), but there is no P (MMA-EA-BA) copolymer is used as the phase change microcapsule of wall material; Also do not see the report of the soap-free emulsion polymerization that adopts reactive emulsifier at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Weigh n-hexadecane and ethyl stearate respectively according to the mass ratio of 1:0.67, and mix the weighed n-hexadecane and ethyl stearate evenly to prepare the core material; according to the mass ratio of 12:1: 1 Weigh methyl methacrylate, butyl acrylate, and ethyl acrylate respectively, and mix the weighed methyl methacrylate, butyl acrylate, and ethyl acrylate to form a mixture; weigh divinyl sulfone, divinyl The mass ratio of sulfone to the mixture is 0.002:1; the mixture is uniformly mixed with the weighed divinyl sulfone to prepare the wall material; the prepared core material and the wall material are evenly mixed to form a core material-wall material mixture, the core The mass ratio of wood to wall material is 0.5:1; the core material-wall material mixture is heated to 35°C in a hot water bath, and a magnetic device is used to stir the core material-wall material mixture for 30 minutes during the heating process in the water bath to prepare the oil phase A; ...

Embodiment 2

[0083] Weigh n-octadecane and butyl stearate respectively according to the mass ratio of 1:1, and mix the weighed n-octadecane and butyl stearate evenly to prepare the core material; the mass ratio is 18:1 : 1 Weigh methyl methacrylate, butyl acrylate, and ethyl acrylate respectively, and mix the weighed methyl methacrylate, butyl acrylate, and ethyl acrylate to form a mixture; weigh ethylene glycol dimethacrylate ester, the mass ratio of ethylene glycol dimethacrylate to the mixture is 0.005:1; the mixture is mixed with the weighed ethylene glycol dimethacrylate to prepare the wall material; the prepared core material and the wall The materials are mixed evenly to form a core material-wall material mixture, and the mass ratio of the core material to the wall material is 1:1; the core material-wall material mixture is heated to 40°C in a hot water bath, and magnetic force is used during the heating process in the water bath Stir the core material-wall material mixture for 40 m...

Embodiment 3

[0089] Weigh n-eicosane and butyl stearate respectively according to the mass ratio of 1:1.5; mix the weighed n-eicosane and butyl stearate evenly to prepare the core material; the mass ratio is 20:1 : 1 Weigh methyl methacrylate, butyl acrylate, and ethyl acrylate respectively, and mix the weighed methyl methacrylate, butyl acrylate, and ethyl acrylate to form a mixture; weigh N,N-methylene The mass ratio of bisacrylamide, N, N-methylenebisacrylamide to the mixture is 0.010:1; the mixture is mixed with the weighed N, N-methylenebisacrylamide to prepare the wall material; the prepared The core material and the wall material are mixed evenly to form a core material-wall material mixture, and the mass ratio of the core material to the wall material is 1.5:1; the core material-wall material mixture is heated to 45°C in a hot water bath, During the heating process, a magnetic device was used to stir the core material-wall material mixture for 50 minutes to prepare oil phase A;

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Abstract

The invention discloses a method for preparing phase change microcapsules by adopting emulsifier-free emulsion polymerization. The method comprises the following specific steps: preparing a core material by using n-alkane, stearic acid and alkyl ester, preparing a wall material by using methyl methacrylate, butyl acrylate, ethyl acrylate and a cross-linking agent, mixing the core material with the wall material to prepare an oil phase A; dissolving a reactive emulsifier in deionized water to obtain an aqueous phase B; adding the oil phase A into the aqueous phase B to form an oil-water mixture, performing ultrasonic dispersion on the oil-water mixture by adopting an ultrasonic dispersion instrument to obtain an O / W type pre-emulsion; heating the O / W type pre-emulsion in water bath, and adding an initiator into the O / W type pre-emulsion to prepare a phase change microcapsule emulsion; leaving the phase change microcapsule emulsion to stand, filtering, cleaning, and drying to obtain the phase change microcapsules. According to the method for preparing phase change microcapsules by adopting emulsifier-free emulsion polymerization, provided by the invention, water is taken as a solvent under a reactive emulsifying condition, and a water soluble initiator is used for initiating free radical polymerization, so that the phase change microcapsules which are uniform but small in sizes can be prepared.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of phase-change microcapsules, and in particular relates to a method for preparing phase-change microcapsules by using a soap-free emulsion polymerization method. Background technique [0002] Phase change materials refer to a class of substances that automatically absorb or release latent heat to the environment and adjust their own stored heat by using the phase or structure changes of the material itself within a certain temperature range, thereby achieving the regulation of the ambient temperature. Most of the existing phase change materials have the defects of high undercooling and easy phase separation, especially for solid-liquid phase change materials, which are easy to flow and leak during use. [0003] At present, the processing method of most phase change materials is microencapsulation technology. Microcapsule coating technology is a technology that uses organic polymer ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06C08F220/14B01J13/14
Inventor 周建华崔艳娇马建中魏筱筱
Owner SHAANXI UNIV OF SCI & TECH
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