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Boron nitride/graphene double-heat-conduction-base aerogel 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 material and its preparation, which can solve the problem of decreasing latent heat of phase change, decreasing relative content of phase change material, Affect the application effect of materials and other issues, and achieve the effects of small changes in phase transition temperature and latent heat of phase transition, enhanced thermal stability performance, and good thermal cycle stability.

Active Publication Date: 2020-09-15
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Boron nitride/graphene double-heat-conduction-base aerogel composite phase change material and preparation method thereof
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  • Boron nitride/graphene double-heat-conduction-base aerogel composite phase change material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0060] A preparation method of boron nitride / graphene dual thermally conductive base aerogel composite phase change material, comprising the following steps:

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

[0062] Step 2) Preparation of boron nitride / graphene dual thermally conductive base aerogel. First, the modified boron nitride obtained in step 1 is mixed with polyvinylpyrrolidone 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 ultrasonicated for 30min to obtain a graphene oxide solution, and then the boron nitr...

Embodiment 2

[0079] A method for preparing a boron nitride / graphene dual thermally conductive base aerogel composite phase change material, the unspecified steps are the same as those in Example 1, the difference is: in the step 2, the modified boron nitride solute mass is added is 20% of the mass of the graphene oxide solute. The resulting sample was named OD / GBA-1.

[0080] After the mass calculation of the boron nitride / graphene dual thermally conductive base aerogel before and after impregnation, it can be seen that when the mass of the modified boron nitride solute is 20% of the solute mass of graphene oxide, the adsorption of 5.4 phase change material n-octadecane is relatively high. In Example 1, the adsorption amount decreased, indicating that with the decrease of the addition amount of boron nitride, the carrier provided by the boron nitride decreased, resulting in the decrease of the adsorbed phase change material.

[0081] To demonstrate the phase change properties of a boron n...

Embodiment 3

[0084] A method for preparing a boron nitride / graphene dual thermally conductive base aerogel composite phase change material, the unspecified steps are the same as those in Example 1, the difference is: in the step 2, the modified boron nitride solute mass is added Same mass as graphene oxide solute. The resulting sample was named OD / GBA-3.

[0085] After the mass calculation of the boron nitride / graphene dual thermally conductive base aerogel before and after impregnation, it can be seen that when the mass of the boron nitride solute is the same as the mass of the graphene oxide solute, 9g of n-octadecane, a phase change material, is adsorbed. The increase in the amount of adsorption effectively shows that the addition of boron nitride provides a carrier for the adsorption of the phase change material, which can increase the mass ratio of the phase change material.

[0086] To demonstrate the phase change properties of the as-prepared boron nitride / graphene dual thermally c...

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Abstract

The invention discloses a boron nitride / graphene double-heat-conduction-base aerogel composite phase change material. The material is formed by compounding modified boron nitride / graphene aerogel andn-octadecane by adopting a vacuum impregnation method. The double-heat-conduction aerogel is prepared by taking graphene oxide, modified boron nitride, polyvinylpyrrolidone and ethylenediamine as rawmaterials to prepare boron nitride / graphene hydrogel, freeze-drying the boron nitride / graphene hydrogel and then calcining the boron nitride / graphene hydrogel at a constant temperature. Polyvinylpyrrolidone is used as a cross-linking agent, and ethylenediamine is used as a reducing agent. A preparation method of the composite phase change material comprises the following steps: 1) preparing modified boron nitride; 2) preparing boron nitride / graphene double-heat-conduction-base aerogel; and 3) preparing the boron nitride / graphene double-heat-conduction-base aerogel composite phase change material. When the material is applied as a phase change material, the heat conductivity coefficient is 0.9-1.6 W / (m.K); wherein the phase change temperature is 19-32 DEG C, and the phase change latent heatis 200-220 J / g. The composite phase change material has the following advantages: 1, the heat conductivity coefficient is improved by 738%; 2, the leakage problem in the phase change process is effectively solved; and 3, the phase-change latent heat and the heat stability are high;

Description

technical field [0001] The invention relates to the field of phase change energy storage materials, in particular to a boron nitride / graphene dual thermally conductive base aerogel 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 traditional energy is mainly composed of C, S, N and other elements, so the consumption process often emits CO, which has a greenhouse effect on the global environment. 2 , CO and SO which are 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 by ...

Claims

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Application Information

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Patent Type & Authority Applications(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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