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High-temperature and high-enthalpy phase change material microcapsule with multiwall structure, and preparation method thereof

A technology of phase change materials and wall structures, applied in heat exchange materials, chemical instruments and methods, layered products, etc., to achieve the effects of improving service life, overcoming difficulties in recycling, and improving thermal stability

Active Publication Date: 2019-08-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, most of the research on phase change materials has focused on the medium and low temperature regions, and less research has been done on the high temperature region.

Method used

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  • High-temperature and high-enthalpy phase change material microcapsule with multiwall structure, and preparation method thereof
  • High-temperature and high-enthalpy phase change material microcapsule with multiwall structure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Polyurethane is used as a volume expansion buffer layer, graphene oxide is used as an anti-corrosion layer and a polyborosilazane precursor is used as a high-temperature resistant strength layer to coat a high-temperature phase change material sodium chloride

[0024] Use a 400-mesh filter to screen out 5g of sodium chloride, add it to 10g of polyurethane system, and emulsify at high speed for 30 minutes to obtain particles coated with polyurethane on the surface, then disperse the obtained particles into 200ml of water phase, transfer them to a 500ml three-necked flask, and add 1.6g (1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride) and 0.5g N-hydroxysuccinimide, after activation for 30min, add 50ml dropwise with a constant pressure funnel, Graphene oxide aqueous solution with a solid content of 0.5% was reacted for 12 hours at 70° C. at a rotational speed of 200 rpm, centrifuged and washed three times, and freeze-dried. Then, by solvent extractio...

Embodiment 2

[0025] Example 2: Polydopamine is used as a volume expansion buffer layer, graphene is used as an anti-corrosion layer, and silicon dioxide is used as a high-temperature resistant strong layer to coat the high-temperature phase change material lithium fluoride

[0026] Use a 200-mesh filter to screen out 20g of lithium fluoride and 5g of dopamine hydrochloride, add it to 500ml of aqueous solution with pH=8.5, transfer it to a 1000ml three-necked flask, and react at 30°C with a rotation speed of 100rpm for 24 hours, then centrifuge, wash and dry . The obtained product repeats the above operation, so that the polydopamine layer reaches a certain thickness. The obtained two-layer polydopamine-coated lithium fluoride particles were dispersed into 500 ml of graphene oxide aqueous solution with a solid content of 0.05%, at a rotation speed of 150 rpm, at 60 degrees Celsius, for 18 hours, centrifuged and washed three times, and freeze-dried. Then adopt the sol-gel method, take 5g dr...

Embodiment 3

[0027] Example 3: Polyurethane is used as a volume expansion buffer layer, graphene oxide is used as an anti-corrosion layer and a polyborosiloxane precursor is used as a high-temperature resistant strong layer to coat a high-temperature phase change material lithium chloride

[0028] Use a 200-mesh filter to screen out 5g of lithium chloride, add it to 10g of polyurethane system, and emulsify at high speed for 30 minutes to obtain particles coated with polyurethane on the surface, then disperse the obtained particles into 200ml of water phase, transfer them to a 500ml three-necked flask, and add 1.6g (1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride) and 0.5g N-hydroxysuccinimide, after activation for 30min, add 50ml dropwise with a constant pressure funnel, Graphene oxide aqueous solution with a solid content of 0.5% was reacted for 12 hours at 70° C. at a rotational speed of 200 rpm, centrifuged and washed three times, and freeze-dried. Then, by solvent extractio...

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Abstract

The invention relates to a high-temperature and high-enthalpy phase change material microcapsule with a multiwall structure, and a preparation method thereof. The shell structure includes three layerswhich are a volume expansion buffering layer, an anticorrosion layer and a high temperature-resistant strong layer respectively. A material with the thermal decomposition temperature lower than the phase transition temperature of a core material is used as the volume expansion buffering layer, so the volume expansion buffering layer plays a role in occupation in the process of coating with the outer shell layer at a low temperature, and the volume space formed by the high-temperature thermal decomposition buffers volume expansion caused by the phase change of the core material. The middle layer is the anticorrosion layer, and needs to be coated with a dense layer of an anticorrosive material in order to prevent the molten phase change material from seeping and destroying a base material in contact with the phase change material. The outermost layer is the high temperature-resistant strong layer, and requires certain compactness, heat resistance and strength, so that the capsule is protected during embedding and using of the base material, thereby the service life and the thermal stability of the capsule are improved. Compared with the prior art, the preparation method of the invention overcomes the defect that the high temperature phase change material microcapsule is difficult to recycle, and expands the application of the phase change material in extreme environments.

Description

technical field [0001] The invention belongs to microcapsules and a preparation method, and relates to a high-temperature, high-enthalpy phase-change material multi-wall structure microcapsule and a preparation method, in particular to using an inorganic salt with a relatively high phase-transition temperature and a large latent heat as the core material of the phase-change microcapsule. Because it has a large volume expansion and contraction rate in the phase transition process, and has strong corrosiveness after melting, the present invention prepares a multi-wall structure microcapsule, which sequentially includes a volume expansion buffer layer, an anti-corrosion layer and a high-temperature resistant strength layer , to obtain recyclable high temperature phase change material microcapsules. Background technique [0002] When a hypersonic vehicle passes through the atmosphere, due to intense friction with air molecules, the temperature of the outermost layer is as high a...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B27/28B32B27/40C09K5/06
CPCB32B9/00B32B9/007B32B9/04B32B9/045B32B27/28B32B27/40C09K5/063
Inventor 张秋禹刘锦刘毅彬刘宗旭
Owner NORTHWESTERN POLYTECHNICAL UNIV
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