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A kind of boron nitride/graphene double heat conduction base airgel composite phase change material and preparation method thereof

A composite phase change material and boron nitride technology are applied in the field of boron nitride/graphene dual thermally conductive base aerogel composite phase change materials and their preparation, which can solve the problem of lowering latent heat of phase change, affecting the application effect of materials, and reducing phase change. The relative content of the material is reduced and other problems, so as to achieve the effect of small changes in phase transition temperature and latent heat of phase transition, good thermal cycle stability, and enhanced thermal stability performance.

Active Publication Date: 2022-02-08
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shell structure and the introduction of nanomaterials with high thermal conductivity, the relative content of phase change materials will inevitably decrease, resulting in a decrease in the latent heat of phase change per unit mass.
For example, in the aforementioned new heat-conducting microcapsules, the quality of the boron nitride melamine-formaldehyde shell reaches 30% of the overall mass of the composite material, seriously affecting the actual application effect of the material

Method used

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  • A kind of boron nitride/graphene double heat conduction base airgel composite phase change material and preparation method thereof
  • A kind of boron nitride/graphene double heat conduction base airgel composite phase change material and preparation method thereof
  • A kind of boron nitride/graphene double heat conduction base airgel composite phase change material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A kind of preparation method of boron nitride / graphene double heat conduction base airgel composite phase change material, comprises the following steps:

[0061] Step 1) Preparation of modified boron nitride, 5g of boron nitride was placed in 200mL of NaOH solution with a concentration of 5wt%, and then stirred in a constant temperature water bath at 90°C for 2h to carry out the modification reaction. After the reaction was completed, the obtained product was Filter and wash until the pH is neutral, then dry at 80°C for 24 hours, and grind to obtain modified boron nitride;

[0062] Step 2) For the preparation of boron nitride / graphene double thermal conductivity airgel, first mix the modified boron nitride obtained in step 1 with polyvinylpyrrolidone and deionized water whose mass is 16% of the mass of boron nitride and deionized water for 30 minutes to obtain Boron nitride solution, at the same time, the graphene oxide solution with a concentration of 10mg / mL was ultr...

Embodiment 2

[0079] A preparation method of a boron nitride / graphene double heat conduction base airgel composite phase change material, the steps not specifically described are the same as in Example 1, the difference is: in the step 2, the mass of modified boron nitride solute is added It is 20% of the mass of graphene oxide solute. The resulting sample was designated OD / GBA-1.

[0080] According to the mass calculation of boron nitride / graphene double thermal conductivity airgel before and after impregnation, when the solute mass of modified boron nitride is 20% of the solute mass of graphene oxide, the adsorption of 5.4 phase change material n-octadecane is relatively The amount of adsorption decreased in Example 1, indicating that as the amount of boron nitride added decreased, the carrier provided by it decreased, resulting in a decrease in the adsorbed phase change material.

[0081] In order to prove the phase change performance of the prepared boron nitride / graphene dual thermal ...

Embodiment 3

[0084] A preparation method of a boron nitride / graphene double heat conduction base airgel composite phase change material, the steps not specifically described are the same as in Example 1, the difference is: in the step 2, the mass of modified boron nitride solute is added Same mass as graphene oxide solute. The resulting sample was designated OD / GBA-3.

[0085] Through the mass calculation of the boron nitride / graphene double heat conduction base aerogel before and after impregnation, it can be known that when the boron nitride solute mass is the same as the graphene oxide solute mass, 9g of phase change material n-octadecane is adsorbed, compared to Example 1 The increase in adsorption capacity effectively shows that the addition of boron nitride provides a carrier for the adsorption of phase change materials and can increase the mass proportion of phase change materials.

[0086] In order to prove the phase change performance of the as-prepared boron nitride / graphene dua...

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Abstract

The invention discloses a boron nitride / graphene double heat conduction base airgel composite phase change material, which is compounded by a modified boron nitride / graphene airgel and n-octadecane by a vacuum impregnation method. Double thermally conductive airgel is prepared from graphene oxide, modified boron nitride, polyvinylpyrrolidone and ethylenediamine as raw materials to prepare boron nitride / graphene hydrogel, freeze-dried, and then calcined at constant temperature; polyvinylpyrrolidone As crosslinking agent, ethylenediamine as reducing agent. The preparation method comprises the following steps: 1) preparation of modified boron nitride; 2) preparation of boron nitride / graphene double heat conduction base aerogel; 3) boron nitride / graphene double heat conduction base airgel composite phase The preparation of variable materials. As a phase change material, the thermal conductivity is 0.9‑1.6W / (m K); the phase change temperature is 19‑32°C, and the latent heat of phase change is 200‑220J / g. The invention has the following advantages: 1. The thermal conductivity is increased by 738%; 2. The leakage problem in the phase change process is effectively solved; 3. High phase change latent heat and thermal stability.

Description

technical field [0001] The invention relates to the field of phase-change energy storage materials, in particular to a boron nitride / graphene double heat-conducting base airgel composite phase-change material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of modern industry, people's demand for energy has gradually expanded. However, most of the traditional energy is non-renewable energy, and it is easy to face the problem of energy shortage, and the traditional energy is mainly composed of elements such as C, S, N, etc., so in the process of consumption, it often emits CO, which has a greenhouse effect on the global environment. 2 , CO and SO harmful to the survival of human society 2 , NO and other by-products. Therefore, people urgently need to research and develop clean and renewable energy to replace traditional energy and improve the utilization rate of existing energy. However, renewable energy is limited...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14C09K5/06
CPCC09K5/14C09K5/063
Inventor 张焕芝朱钰漕季蓉周福希张青峰黄朝玮夏永鹏魏胜孙立贤徐芬
Owner GUILIN UNIV OF ELECTRONIC TECH
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