Preparation method of phase-change energy-storage microcapsule

A phase-change energy storage and microcapsule technology, which is applied in the field of preparation of phase-change energy storage microcapsules, can solve the problems of difficulty in preparation, toxicity, and unfavorable industrial production, and achieves easy preparation, high phase transition enthalpy, and high efficiency. Beneficial for industrial production

Active Publication Date: 2011-01-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method must use vinyl and divinyl free radical monomers as shell polymer raw materials, which are not easy to prepare and are toxic, which is not conducive to industrial production.

Method used

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  • Preparation method of phase-change energy-storage microcapsule
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  • Preparation method of phase-change energy-storage microcapsule

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preparation example Construction

[0031] The invention discloses a preparation method of phase change energy storage microcapsules, comprising:

[0032] Provide first emulsion, described first emulsion takes paraffin as dispersed phase, takes chitosan aqueous solution as continuous phase;

[0033] Dispersing the primary emulsion in an external oil phase to obtain a double emulsion, the external oil phase being liquid paraffin;

[0034] A cross-linking agent is added to the double emulsion to carry out a cross-linking reaction to obtain phase-change energy storage microcapsules, and the cross-linking agent is glutaraldehyde.

[0035] According to the present invention, the first emulsion of described chitosan solution coating paraffin is preferably prepared according to the following method:

[0036] Chitosan is dissolved in an acidic aqueous solution to obtain a first solution,

[0037] The first solution is heated, and paraffin wax is added dropwise into the first solution for emulsification to obtain an in...

Embodiment 1

[0047] Dissolve 3g of chitosan with a deacetylation degree of 85% in 200mL of an aqueous solution containing 0.5wt% acetic acid, heat the chitosan aqueous solution to 45°C, melt 10mL of paraffin wax with a melting point of 39°C and add it dropwise to the shell In the polysaccharide aqueous solution, keep stirring at a speed of 1400 rpm for 3 hours to fully emulsify, and finally obtain a white viscous liquid, namely the primary emulsion;

[0048] 50 mL of the prepared primary emulsion was added dropwise to 200 mL of span80 liquid paraffin and stirred for 3 hours to obtain a double emulsion;

[0049] Slowly add the glutaraldehyde aqueous solution of 5g 25wt% in double emulsion afterwards and carry out cross-linking reaction, along with the carrying out of cross-linking reaction, reactant turns yellow gradually, after color no longer changes, cross-linking reaction finishes, and product is removed from reaction Take it out from the container, filter it with suction, wash it with ...

Embodiment 2

[0054] Dissolve 3g of chitosan with a deacetylation degree of 85% in 200mL of an aqueous solution containing 0.5wt% acetic acid, heat the chitosan aqueous solution to 45°C, melt 10mL of paraffin wax with a melting point of 39°C and add it dropwise to the shell In the polysaccharide aqueous solution, keep stirring at a speed of 2100 rpm for 3 hours to fully emulsify, and finally obtain a white viscous liquid, namely the primary emulsion;

[0055] 50 mL of the prepared primary emulsion was added dropwise to 200 mL of span80 liquid paraffin and stirred for 3 hours to obtain a double emulsion;

[0056] Slowly add the glutaraldehyde aqueous solution of 5g 25wt% in double emulsion afterwards and carry out cross-linking reaction, along with the carrying out of cross-linking reaction, reactant turns yellow gradually, after color no longer changes, cross-linking reaction finishes, and product is removed from reaction Take it out from the container, filter it with suction, wash it with ...

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Abstract

The embodiment of the invention discloses a preparation method of a phase-change energy-storage microcapsule, which comprises the following steps: providing a preemulsion, wherein the preemulsion uses paraffin as the dispersed phase and uses a chitosan water solution as the continuous phase; dispersing the preemulsion in an outer oil phase to obtain a compound emulsion, wherein the outer oil phase is liquid paraffin; and adding glutaric dialdehyde into the compound emulsion to carry out cross-linking reaction, thereby obtaining the phase-change energy-storage microcapsule. The invention uses paraffin as the core material, uses chitosan as the shell material, and enables the chitosan to be crosslinked by adding the cross-linking agent glutaric dialdehyde, thereby obtaining the microcapsule. The invention uses chitosan as the shell polymer material, which has the advantages of no toxicity and easy preparation, thereby being beneficial to industrial production. In addition, compared with the prior art, the invention does not need to add an initiator or a surfactant, thereby having the advantage of simple preparation method. The experimental result indicates that the microcapsule can remain the structure and high phase-change enthalpy value after repeated heating and cooling, thereby having the function of phase-change energy-storage.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation method of phase-change energy storage microcapsules. Background technique [0002] Phase change energy storage materials are materials that store and release heat energy by using the heat absorption and release of substances during the phase change process, and are widely used in construction, aerospace, food and other fields. Using phase-change energy storage materials to make building interior decoration materials can make full use of the energy of the environment to achieve the effect of warm winter and cool summer; phase-change energy storage materials used for interior decoration of space station manned spacecraft can not only reduce the fluctuation of cabin temperature , obtain a comfortable space environment, and can reduce energy loss and save energy. [0003] Currently commonly used phase change energy storage materials mainly include inorganic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14
Inventor 门永锋刘凌志刘先之
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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