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Metal fluoride high-temperature phase change energy storage microcapsule, preparation method and application thereof

A high-temperature phase change and microcapsule technology, applied in the field of materials, can solve the problems that the shell temperature resistance is difficult to reach fluoride at the same time, the preparation process is complicated, and the research on coating is less. low cost effect

Active Publication Date: 2020-07-10
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently published invention patents are mainly aimed at medium and low temperature phase change materials. The invention patent (CN, 110126385A) discloses a high temperature and high enthalpy phase change material multi-wall structure microcapsule and its preparation method, involving microcapsule coating of various salts , the patented shell structure consists of three layers, namely volume expansion buffer layer, anti-corrosion layer and high temperature resistant strength layer, but the preparation process is complicated, and it is difficult for the temperature resistance of the three shell layers to reach above the melting point of fluoride at the same time
At present, there are few studies on microencapsulation of metal fluorides, especially metal fluorides with higher melting points such as magnesium fluoride and calcium fluoride.

Method used

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  • Metal fluoride high-temperature phase change energy storage microcapsule, preparation method and application thereof
  • Metal fluoride high-temperature phase change energy storage microcapsule, preparation method and application thereof
  • Metal fluoride high-temperature phase change energy storage microcapsule, preparation method and application thereof

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Embodiment 1

[0038] Embodiment 1, magnesium fluoride high-temperature phase change microcapsules

[0039] A fluoride high-temperature phase-change thermal storage microcapsule and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0040] Step 1, get 5g of magnesium fluoride and disperse it in a solution of 5g of phenolic resin dissolved in 25g of ethanol, in which magnesium fluoride does not dissolve, stir and disperse evenly;

[0041] Step 2, slowly adding 25g of deionized water to the reaction system to promote phase separation and deposition of the phenolic resin on the surface of the magnesium fluoride particles;

[0042] Step 3: Adjust the pH value of the solution to 1, and heat it for 1 hour in a water bath at 50°C and stirring at 300 r / min to promote the in-situ curing of the phenolic resin, so as to avoid the destruction of the shell structure of the microcapsules caused by the melting of the resin during the post-curing process; ...

Embodiment 2

[0046] Embodiment 2, lithium fluoride high temperature phase change microcapsules

[0047] A fluoride high-temperature phase-change thermal storage microcapsule and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0048] Step 1, take 10g of lithium fluoride and disperse it in a solution of 1g of phenolic resin dissolved in 10g of methanol, in which lithium fluoride does not dissolve, stir and disperse evenly;

[0049] Step 2, slowly adding 100 g of deionized water to the reaction system to promote phase separation and deposition of the phenolic resin onto the surface of the lithium fluoride particles;

[0050] Step 3: Adjust the pH value of the solution to 5, and heat it for 24 hours in a water bath at 95°C and stirring at 400 r / min to promote the in-situ curing of the phenolic resin, so as to avoid the destruction of the shell structure of the microcapsules caused by resin melting during the post-curing process;

[0051] ...

Embodiment 3

[0054] Embodiment 3, sodium fluoride high temperature phase change microcapsules

[0055] A fluoride high-temperature phase-change thermal storage microcapsule and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0056] Step 1, get 5g of sodium fluoride and disperse it in a solution of 5g of phenolic resin dissolved in 20g of propanol, in this solution sodium fluoride is insoluble, stir and disperse evenly;

[0057] Step 2, slowly adding 100 g of tetraethyl orthosilicate to the reaction system to impel the phase separation of the phenolic resin to deposit on the surface of the sodium fluoride particles;

[0058] Step 3: Adjust the pH value of the solution to 1, and heat it for 24 hours in a water bath at 50°C and stirring at 300 r / min to promote the in-situ curing of the phenolic resin, so as to avoid the destruction of the shell structure of the microcapsules caused by resin melting during the post-curing process;

[0059...

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Abstract

The invention provides a metal fluoride high-temperature phase change energy storage microcapsule, a preparation method and application thereof. The preparation method of the high-temperature phase change microcapsule comprises the following steps: dispersing metal fluoride particles into a solution of phenolic resin, adding a poor solvent into the system, inducing phase separation of phenolic resin for deposition on the surfaces of the metal fluoride particles, performing heating, controlling in-situ curing of the phenolic resin, performing filtering, collecting solids, and conducting post-curing to obtain phenolic resin coated metal fluoride microcapsules, and conducting carbonizing treatment to obtain the carbon shell layer coated metal fluoride microcapsules. The phase change energy storage microcapsule provided by the invention has a core-shell structure, wherein the core is a simple metal fluoride, the shell is formed by carbonizing phenolic resin at high temperature, and the prepared high-temperature phase change heat storage microcapsule has the advantages of high coating rate, good heat-conducting properties, good high-temperature resistance and the like.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a phase-change energy storage microcapsule and a preparation method thereof, in particular to a metal fluoride high-temperature phase-change energy storage microcapsule, a preparation method and an application thereof. Background technique [0002] Energy is an important foundation of the national economy. With the rapid development of industry, the demand for energy is increasing day by day. In order to better utilize energy efficiently, phase change energy storage materials have been widely used. Phase change materials (Phase Change Materials, PCMs), also known as latent thermal energy storage materials (Latent Thermal Energy Storage Materials, LTESM) refer to a substance that can absorb or release heat when the phase changes, and the temperature of the substance itself does not change or changes little. kind of material. This type of material absorbs heat when the temperature is highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C09K5/14
CPCC09K5/063C09K5/14
Inventor 王倩江羽田思思赵彤罗振华李昊袁月
Owner INST OF CHEM CHINESE ACAD OF SCI
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