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Phase change microcapsules and preparation method thereof

A phase-change microcapsule and capsule wall technology, which is applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of low adjustability of paraffin phase change temperature, restricting the application of phase change microcapsules, etc. Good thermal and solvent stability, easy operation, high enthalpy effect

Inactive Publication Date: 2011-12-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation method is simple, the phase change temperature of paraffin wax is less adjustable, which limits the application of phase change microcapsules

Method used

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  • Phase change microcapsules and preparation method thereof
  • Phase change microcapsules and preparation method thereof
  • Phase change microcapsules and preparation method thereof

Examples

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preparation example Construction

[0031] The present invention also provides a preparation method of phase change microcapsules, comprising the following steps:

[0032] dissolving chitosan in an aqueous acetic acid solution to obtain an aqueous chitosan solution;

[0033] Add molten fatty alcohol to the chitosan aqueous solution, and obtain primary emulsion after emulsification;

[0034] adding the primary emulsion into liquid paraffin, and stirring to obtain a double emulsion;

[0035] Glutaraldehyde is added into the double emulsion to obtain phase change microcapsules after reaction.

[0036] Firstly, chitosan is dissolved in acetic acid aqueous solution to obtain chitosan aqueous solution. In the present invention, the chitosan is preferably a chitosan with a deacetylation degree of 70% to 95%, more preferably a chitosan with a deacetylation degree of 75% to 90%. The mass concentration of the aqueous acetic acid solution is preferably 0.05%-2%, more preferably 0.1%-1.5%, most preferably 0.3%-0.6%. The...

Embodiment 1

[0050] 3g of chitosan with deacetylation degree of 85% is dissolved in 200mL mass concentration of 0.5% acetic acid aqueous solution to obtain chitosan aqueous solution; the chitosan aqueous solution is heated to 55°C, and 6g of melting point is added dropwise thereto. Melted n-hexadecanol at 52°C was stirred at a speed of 1000 rpm for 2 hours to obtain a white viscous primary emulsion;

[0051] Add 50 mL of primary emulsion dropwise to 200 mL of liquid paraffin and stir for 1 h to obtain a double emulsion; add 5 g of glutaraldehyde aqueous solution with a mass concentration of 25% to the double emulsion for cross-linking reaction, suction filter the obtained reaction product, dilute NaOH After solution washing, water washing and drying, dark yellow phase-change microcapsules are obtained.

[0052] The phase-change microcapsules were observed with an optical microscope, and the results can be found in figure 1 , figure 1 The photomicrograph of the phase change microcapsule p...

Embodiment 2

[0058] The phase-change microcapsules were prepared according to the raw materials, steps and methods provided in Example 1, with the difference that when preparing the primary emulsion, the stirring speed was 400 rpm.

[0059] The DSC scanning of the phase change microcapsules showed that the crystallization enthalpy was 120 J / g, and the melting enthalpy was 130 J / g.

[0060] The TGA analysis of the phase change microcapsules shows that it has good thermal stability and can be used below 200°C.

[0061] The phase-change microcapsules were added to ethanol, chloroform, tetrahydrofuran, acetone, dimethyl sulfoxide, N,N-dimethylformamide and ether, and the results showed that they had good solvent resistance and were insoluble in Common solvents such as ethanol, chloroform, tetrahydrofuran, acetone, dimethyl sulfoxide, N,N-dimethylformamide and ether.

[0062] The phase-change microcapsules were added to an aqueous solution of acetic acid with a mass concentration of 1.5%, soak...

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Abstract

The invention provides a phase change microcapsule, which comprises a capsule wall and a capsule core wrapped in the capsule wall, the capsule wall is chitosan cross-linked by glutaraldehyde, and the capsule core is fatty alcohol. The present invention also provides a preparation method of phase change microcapsules, comprising the following steps: dissolving chitosan in an aqueous acetic acid solution to obtain an aqueous solution of chitosan; adding molten fatty alcohol to the aqueous solution of chitosan, emulsifying After that, the first emulsion is obtained; the first emulsion is added into the liquid paraffin, and the double emulsion is obtained after stirring; glutaraldehyde is added to the double emulsion, and the phase change microcapsules are obtained after reaction. The phase-change microcapsule provided by the present invention uses fatty alcohol as the capsule core, and the phase-change microcapsules prepared by different fatty alcohols have different phase-transition temperatures. Therefore, the phase-change temperature of the phase-change microcapsules provided by the present invention is adjustable, It can meet the use requirements of phase change microcapsules at different temperatures.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, in particular to a phase change microcapsule and a preparation method thereof. Background technique [0002] Phase change materials are materials that use the heat absorption and release of substances during the phase change process to store and release heat energy and achieve temperature regulation. They are widely used in construction, aerospace, food and other fields. For example, phase change materials are used to make buildings The interior decoration materials can make full use of the energy of the environment to obtain the effect of warming in winter and cooling in summer; when phase-change materials are used to install manned spacecraft on space stations, it can not only reduce the temperature fluctuation in the cabin, obtain a comfortable space environment, but also reduce energy loss ,save energy. [0003] Currently commonly used phase change materials generally include ...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/14
Inventor 刘凌志门永锋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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