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Heat-conduction-enhanced ionic liquid composite phase-change heat-storage material based on modified graphene, and preparation method thereof

A technology of ionic liquid and thermal conductivity enhancement, applied in the field of composite materials, can solve the problems of low latent heat of phase change, reduce production cost, and restrict the application of graphene

Pending Publication Date: 2021-07-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent (application number: 201510861168.6) discloses a preparation method of an ionic liquid-water system phase change energy storage material. In this method, the ionic liquid is directly melted and mixed with water, and then a nucleating agent is added, wherein the mass percentage of water is less than 20%, the mass percentage of nucleating agent is less than 5%, the prepared ionic liquid-water system phase change energy storage material effectively reduces the production cost, its thermal conductivity is 0.50W / (m K), but there is phase change latent heat not high disadvantage
The two-dimensional structure of graphene is conducive to the rapid transfer of electrons and phonons, and is an ideal thermal conductive filler. However, graphene itself has strong intermolecular forces and is easy to gather, and it is not easy to disperse in the ionic liquid matrix. At the same time, graphene and phase transition Scattering of phonons also occurs between the material matrix, which makes it difficult to form a continuous and effective heat conduction path in the ionic liquid, which affects its heat conduction enhancement effect and restricts the application of graphene in ionic liquid phase change materials.

Method used

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  • Heat-conduction-enhanced ionic liquid composite phase-change heat-storage material based on modified graphene, and preparation method thereof
  • Heat-conduction-enhanced ionic liquid composite phase-change heat-storage material based on modified graphene, and preparation method thereof
  • Heat-conduction-enhanced ionic liquid composite phase-change heat-storage material based on modified graphene, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0079]1. Take 1-methylimidazole (0.1mol) and 3-bromopropylamine hydrobromide (0.1mol) into a three-necked flask respectively, and add 50mL of ethanol. The apparatus was purged with nitrogen to remove air and moisture. Heated and refluxed in a water bath at 90°C for 24 hours, the stirring speed was 400 rpm, and the temperature of condensed water was 5°C. After the reaction, the reaction solution was rotary evaporated to obtain the crude product, which was redissolved in ethanol, and KOH (0.1 mol) was added to deprotect the amino group, stirred for 12 hours, filtered, and the filtrate was rotary evaporated to obtain an alkyl group containing terminal amino groups. Crude product of imidazole ionic liquid. The crude product was dissolved in a mixed solvent of ethanol-tetrahydrofuran (volume ratio 1:4), filtered, and the filtrate was rotary evaporated to remove the mixed solvent. The product was recrystallized in ethyl acetate to obtain a white solid, which was dried at 40°C for 2...

Embodiment 2

[0084] 1. Take 1-methylimidazole (0.5mol) and 3-bromopropylamine hydrobromide (0.5mol) into a three-necked flask respectively, and add 250mL of ethanol. The apparatus was purged with nitrogen to remove air and moisture. Heated and refluxed in a water bath at 90°C for 48 hours, the stirring speed was 500 rpm, and the temperature of condensed water was 5°C. After the reaction was completed, the reaction solution was rotary evaporated to obtain a crude product, which was redissolved in ethanol, and KOH (0.55mol) was added to deprotect the amino group, stirred for 12 hours, filtered, and the filtrate was rotary evaporated to obtain an alkyl group containing terminal amino groups. Crude product of imidazole ionic liquid. The crude product was dissolved in a mixed solvent of ethanol-tetrahydrofuran (3:2), filtered, and the filtrate was rotary evaporated to remove the mixed solvent. The product was recrystallized in ethyl acetate to obtain a white solid, which was dried at 40°C for ...

Embodiment 3

[0089] 1. Take 1-methylimidazole (0.5mol) and 3-bromopropylamine hydrobromide (0.55mol) into a three-necked flask respectively, and add 250mL of ethanol. The apparatus was purged with nitrogen to remove air and moisture. Heated and refluxed in a water bath at 90°C for 24 hours, the stirring speed was 400 rpm, and the temperature of condensed water was 5°C. After the reaction was completed, the reaction solution was rotary evaporated to obtain a crude product, which was redissolved in ethanol, and KOH (0.6 mol) was added to deprotect the amino group, stirred for 12 hours, filtered, and the filtrate was rotary evaporated to obtain an alkyl group containing terminal amino groups. Crude product of imidazole ionic liquid. The crude product was dissolved in a mixed solvent of ethanol-tetrahydrofuran (1:4), filtered, and the filtrate was rotary evaporated to remove the mixed solvent. The product was recrystallized in ethyl acetate to obtain a white solid, which was dried at 40°C for...

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Abstract

The invention discloses a heat-conduction-enhanced ionic liquid composite phase-change heat-storage material based on modified graphene and a preparation method thereof. The preparation method comprises the steps that firstly, covalent functional modification is conducted on graphene oxide through amino-terminated ionic liquid, and the modified graphene oxide reacts with hydrazine hydrate to be reduced, so the dispersity and interfacial compatibility of a graphene filler in an ionic liquid phase-change material matrix are improved, and the heat conduction characteristic of the composite material is improved; and furthermore, the modified graphene is mixed with the imidazolium ionic liquid phase-change material matrix, and conditions such as rotary evaporation and drying are controlled to obtain a mixture of the modified graphene with different loading capacities and the ionic liquid matrix phase-change material. The material provided by the invention has the characteristics of large phase change latent heat and good thermal stability; and meanwhile, the thermal conductivity is increased by 4.4%-127.9% compared with ionic liquid without modified graphene, and the thermal energy storage and conduction characteristics of the material are remarkably improved.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a modified graphene-based heat conduction-enhanced ionic liquid composite phase-change heat storage material and a preparation method. Background technique [0002] Solid-liquid phase change heat storage technology is achieved by phase change materials (Phase change materials, PCMs) undergoing a solid-liquid phase change when the ambient temperature reaches the melting point and absorbing a large amount of heat. Due to its large latent heat of phase change, small volume, and simple structure , materials are easy to obtain and less pollution, so that it will soon develop into a potential heat storage technology. Solid-liquid phase change materials mainly include paraffin, hydrated salt, alloy, etc., but paraffin has the disadvantages of flammability and poor thermal conductivity, hydrated salt has disadvantages such as supercooling and phase separation, and alloy is suitable for...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 杨伯伦白晶吴志强
Owner XI AN JIAOTONG UNIV
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