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Phase change energy storage microcapsule and preparation method thereof

A phase change energy storage, microcapsule technology, applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of reducing paraffin utilization efficiency, reducing heat conduction efficiency, wasting heat energy, etc.

Active Publication Date: 2014-09-10
中科世宇(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although some phase-change energy storage microcapsules with polystyrene shells do not contain formaldehyde, their enthalpy values ​​are relatively low (Sanchez-Silva L, Rodriguez J F, Romero A, et al.Microencapsulation of PCMswith a styrene- methyl methacrylate copolymer shell by suspension-like polymerisation.Chem.Eng.J.2010,157(1):216-222), which reduces the utilization efficiency of paraffin
If high-enthalpy phase-change energy storage microcapsules are prepared to improve the utilization efficiency of paraffin, the phase-change materials will be supercooled due to the thermal resistance of the shell (supercooling refers to when the external temperature is higher than the melting temperature). At or below the crystallization temperature, the phase change material remains crystalline or molten), which reduces heat transfer efficiency and wastes heat energy
Disperse graphene, carbon nanofibers, carbon nanotubes into phase change materials (Karaipekli A, Sari A, Kaygusuz K. Thermal conductivity improvement of stearic acid using expanded graphite and carbon fiber for energy storage applications. Renewable Energy2007;32:2201- 10. Fukai J, Kanou M, Kodama Y, Miyatake O. Thermal conductivity enhancement of energy storage media using carbon fibers. Energy Conversion and Management2000;41:1543-56. Wang JF, Xie HQ, Xin Z. Thermal properties of paraffin based composites containing multi-walled carbonnanotubes.Thermochim Acta2009;488:39-42.) can increase the thermal conductivity of the phase change material, but the overall thermal insulation of the phase change energy storage microcapsules is also reduced

Method used

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  • Phase change energy storage microcapsule and preparation method thereof
  • Phase change energy storage microcapsule and preparation method thereof
  • Phase change energy storage microcapsule and preparation method thereof

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preparation example Construction

[0039] The preparation method of the phase change energy storage microcapsules of the present invention comprises the following steps:

[0040]Perform emulsion polymerization reaction of paraffin and monomer styrene in the presence of emulsifier, initiator and crosslinking agent to obtain phase change energy storage microcapsules with core-shell structure;

[0041] Reacting the phase-change energy storage microcapsules having a core-shell structure with a sulfonating agent, thereby sulfonating the shell of the phase-change energy storage microcapsules to obtain sulfonated phase-change energy storage microcapsules;

[0042] The reduction reaction of metal ions occurs on the entire shell of the sulfonated phase-change energy storage microcapsules, thereby obtaining the phase-change energy storage microcapsules in which metal or metal oxide particles are compounded on the entire shell.

[0043] The phase change material used in the present invention is paraffin. Paraffin has the...

Embodiment 1

[0061] 1. Preparation of phase change energy storage microcapsules with core-shell structure

[0062] In this embodiment, sodium lauryl sulfate is used as an emulsifier, and the melting point of phase-change paraffin is 52°C.

[0063] Add 0.2 g of sodium lauryl sulfate to 85 g of water, and this solution is used as the water phase;

[0064] The phase-change paraffin of 10g, 2g styrene, 1g divinylbenzene, 0.06g as the azobisisobutyronitrile of initiator are mixed, be warmed up to 60 ℃, stir after making them mix uniformly as oil phase;

[0065] Mix the above-mentioned water phase and oil phase, heat up to 70 ° C, and use a high-speed mixer to shear and emulsify for 2 minutes at a speed of 12000 rpm to obtain an oil-in-water emulsion;

[0066] The above-mentioned oil-in-water emulsion was transferred to a preheated reaction kettle, and an inert gas-nitrogen was introduced, mechanically stirred at 200 rpm, and emulsion polymerization was carried out at 70°C for about 8 hours.

...

Embodiment 2

[0082] 1. Preparation of phase change energy storage microcapsules with core-shell structure

[0083]The sodium salt hydrolyzate of the styrene-maleic anhydride alternating copolymer used in this embodiment is an emulsifier, and the melting point of the phase-change paraffin is 52°C.

[0084] 10g of aqueous solution of 10wt% styrene-maleic anhydride alternating copolymer sodium salt was added to 77g of water, and the pH value was adjusted to 4.5 with hydrochloric acid, and this solution was used as the water phase;

[0085] With 10g phase-change paraffin, 2g styrene, 1g divinylbenzene, 0.06g is mixed as the azobisisobutyronitrile of initiator, is warming up to 60 DEG C, stirs after making them mix uniformly as oil phase;

[0086] Mix the above-mentioned water phase and oil phase, heat up to 70 ° C, and use a high-speed mixer to shear and emulsify for 2 minutes at a speed of 12000 rpm to obtain an oil-in-water emulsion;

[0087] The above-mentioned oil-in-water emulsion was tr...

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Abstract

The invention relates to a phase change energy storage microcapsule and a preparation method thereof, and especially relates to a phase change energy storage microcapsule having the advantages of no formaldehyde release, good heat conduction performance and no super cooling phenomenon, and a preparation method and an application thereof. The phase change energy storage microcapsule has a core-shell structure, wherein the whole shell of the phase change energy storage is compounded with metal or metal oxide particles. The phase change energy storage microcapsule has the advantages of no formaldehyde release, good heat conduction performance and no super cooling phenomenon.

Description

technical field [0001] The invention relates to a phase change energy storage microcapsule and its preparation method and application, in particular to a phase change energy storage microcapsule which does not release formaldehyde, has good thermal conductivity and no overcooling phenomenon, and its preparation method and application. Background technique [0002] Energy is the basis for human survival. However, the current conventional energy sources such as coal, oil, and natural gas are all facing the problem of depletion and non-renewability in the short term. With the rapid development of global industry, the human demand for energy is still increasing, so finding new energy or improving energy utilization has become an important issue facing human society. [0003] If there is a method that can store temporarily unused energy and release it when needed, energy can be used efficiently. At present, phase change energy storage materials are widely used, that is, to store...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/14
Inventor 赵华杨振忠王彦红张成亮
Owner 中科世宇(北京)科技有限公司
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