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Silicon dioxide coated phase-change microcapsules and preparation method and application thereof

A phase change microcapsule, silicon dioxide technology, applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems that phase change microcapsules are difficult to realize and limit the application, and achieves a low breakage rate, Extending the application range and reducing the effect of supercooling

Active Publication Date: 2017-12-26
中科世宇(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in terms of production capacity, it is still difficult to prepare large quantities of phase-change microcapsules coated with inorganic materials; moreover, the amount of phase-change materials coated with inorganic materials in the existing reports is much lower than that of The amount of phase change material coated in organic material-coated phase change microcapsules; these defects seriously limit its application in actual production

Method used

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  • Silicon dioxide coated phase-change microcapsules and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0058] Take 6g of tetraethyl orthosilicate, 0.5g of glycidyltrimethoxysilane and 0.5g of phenyltriethoxysilane and add them into 30g of octadecane, mix well and use it as the oil phase. Take 1g of Tween 80 and add it to 50g of water as the water phase. Add the water phase to the oil phase, use a high-speed shear emulsifier to emulsify at 10,000 rpm for 10 min, transfer the obtained emulsion to a three-necked flask, and react at 70°C for 12 hours under mechanical stirring. The phase change microcapsule dry powder is obtained through separation, washing and further drying.

[0059] The enthalpy retention rate of the silica-coated phase-change microcapsules prepared in this example is 90.5%.

[0060] The scanning electron micrographs of the silica-coated phase-change microcapsules prepared in this embodiment are as follows: figure 1 shown. From figure 1 It can be seen from the figure that the particle size of the silica-coated phase change material prepared in this example is...

Embodiment 2

[0063] Take 10g of ethyl orthosilicate, 0.5g of aminopropyltrimethoxysilane and 0.5g of n-octyltriethoxysilane and add them into 30g of octadecane, mix well and use it as the oil phase. Take 1g of Tween 80 and add it to 50g of water as the water phase. Add the water phase to the oil phase, use a high-speed shear emulsifier to emulsify at 10,000 rpm for 10 min, transfer the obtained emulsion to a three-necked flask, and react at 70°C for 12 hours under mechanical stirring. The phase change microcapsule dry powder is obtained through separation, washing and further drying.

[0064] The enthalpy retention rate of the silicon dioxide-coated phase-change microcapsules prepared in this example was 90.7%.

[0065] In the silica-coated phase change material prepared in this embodiment, the mass percentage of the core material in the phase change microcapsules is 90.7%; the mass percentage of the wall material in the phase change microcapsules is 9.3%; the phase transition temperatur...

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Abstract

The invention discloses silicon dioxide coated phase-change microcapsules and a preparation method and an application thereof, wherein the phase-change microcapsules include a core material and a wall material; the core material includes a phase-change material, and the wall material is silicon dioxide; the enthalpy value retention rate of the silicon dioxide coated phase-change microcapsules is 20-99%; the average particle size of the microcapsules is 0.1-100 microns. Through a sol-gel reaction on an emulsion interface, the silicon dioxide coated phase-change material is obtained by one step; no toxic substances are generated in the preparation process, so the preparation process is green and environmentally friendly; the prepared phase-change energy-storage microcapsules are high in coating rate and low in damage rate, the supercooling degree of the phase-change material is effectively reduced, the obtained phase-change material has no volatile gases, the use is safe, and an application scope is expanded; the preparation method has the advantages of simple process, low cost, cheap and easily obtained used raw materials, and easily achieved industrialization. The phase-change energy-storage microcapsules can be widely applied to the fields of textile, building energy conservation, electronic part and component thermal management, waste heat recovery and the like.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a silicon dioxide-coated phase-change microcapsule and a preparation method and application thereof. Background technique [0002] With the continuous improvement of people's living standards, the shortage of non-renewable energy is becoming more and more serious. In recent years, in order to reduce energy consumption and further achieve the purpose of energy saving and energy storage, researchers have invested a lot of time, manpower and material resources. In the research of phase change energy storage technology, the development of phase change energy storage materials is the most concerned. The application of room temperature phase change materials in building energy saving can effectively reduce indoor temperature fluctuations and reduce energy consumption. [0003] Phase-change energy storage materials (hereinafter referred to as phase-change ...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/02
CPCB01J13/02C09K5/063
Inventor 杨振忠纪旭阳梁福鑫
Owner 中科世宇(北京)科技有限公司
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