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Boron nitride/pea meal double-heat-conduction-base carbon aerogel as well as preparation method and application thereof

A technology of carbon airgel and boron nitride, which is applied in the direction of airgel preparation, carbon preparation/purification, chemical instruments and methods, etc., can solve the problem of inconvenient impregnation of polyethylene glycol, small amount of adsorbed phase change materials, Small specific surface area and other issues, to achieve the effect of maintaining high phase change latent heat characteristics, reducing density, and high thermal conductivity

Inactive Publication Date: 2021-07-23
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with carbon aerogels, the specific surface area of ​​biochars is relatively small, which makes them adsorb less amount of phase change materials, and it is inconvenient to impregnate macromolecular size polyethylene glycol

Method used

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  • Boron nitride/pea meal double-heat-conduction-base carbon aerogel as well as preparation method and application thereof
  • Boron nitride/pea meal double-heat-conduction-base carbon aerogel as well as preparation method and application thereof
  • Boron nitride/pea meal double-heat-conduction-base carbon aerogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A kind of boron nitride addition is the preparation method of the boron nitride / pea flour double thermal conduction base carbon airgel of 13%, comprising the following steps:

[0062] Step 1) Preparation of modified two-dimensional nanosheet boron nitride, 3 g of boron nitride was placed in 300 mL of deionized water and cyclohexane mixed solution, and the nitriding The boron was modified and stripped for 12 h. After the reaction was completed, the obtained product was filtered, then dried at 80 °C for 24 h, and ground to obtain the modified two-dimensional nanosheet boron nitride;

[0063] Step 2) Preparation of carbon airgel with boron nitride / pea flour dual heat-conducting bases. Firstly, mix the modified two-dimensional nanosheet boron nitride obtained in step 1 with 150 mL deionized water and sonicate for 30 min to obtain a boron nitride solution , at the same time, the pea flour was magnetically stirred with diammonium hydrogen phosphate and deionized water with a ...

Embodiment 2

[0097] A method for preparing a boron nitride / pea flour double heat-conductive carbon aerogel with a boron nitride addition of 29%. The solute quality of two-dimensional nanosheet boron nitride is 29% of the solute quality of pea flour.

[0098] In order to prove the application effect of boron nitride / pea flour double thermal conductivity carbon airgel with boron nitride addition of 29% as a phase change material, vacuum impregnation method was used to prepare boron nitride addition of 29% Boron / pea flour double thermal conductivity carbon airgel composite phase change material, the obtained sample is named PCM-4.

[0099] Calculation of the mass of boron nitride / pea flour double thermal conductivity carbon airgel before and after impregnation shows that when the solute mass of boron nitride is 29% of the solute mass of pea flour, 6.321 g of phase change material polyethylene glycol will be adsorbed. Therefore, the adsorption amount of the phase change material in PCM-4 is 9...

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Abstract

The invention relates to a boron nitride / pea meal double-heat-conduction-base carbon aerogel. According to the invention, boron nitride, pea meal and a cross-linking agent are used as raw materials, the boron nitride is firstly prepared into modified two-dimensional nano lamellar boron nitride, then the modified two-dimensional nano lamellar boron nitride, the pea meal and the cross-linking agent are subjected to a water bath curing reaction, freeze drying and low-temperature calcination. The preparation method comprises the following steps: 1) preparing modified two-dimensional nano lamellar boron nitride; and (2) preparing the boron nitride / pea meal double-heat-conduction-base carbon aerogel. According to the application of the product as a phase change material, the boron nitride / pea meal double-heat-conduction-base carbon aerogel composite phase change material is obtained by compounding with polyethylene glycol, the phase change temperature is 39-55 DEG C, the phase change latent heat is 168-171J / g, and the heat conductivity coefficient is 0.46-0.58 W / (m.K). The method has the following advantages: 1, the raw materials are low in cost, easy to obtain and environment-friendly; 2, the heat conductivity coefficient is improved by 187%; 2, the leakage problem is avoided; and 3, the phase change latent heat and the thermal stability are high;.

Description

technical field [0001] The invention relates to the field of carbon aerogels and phase-change energy storage materials, in particular to a carbon aerogel with boron nitride / pea flour dual heat-conducting bases and its preparation method and application. Background technique [0002] With the rapid development of science and technology and industry, the issue of energy supply has become the focus of attention in various fields in the world. Traditional energy consumption is also accompanied by problems such as air pollution, water pollution and energy crisis. Therefore, developing new sustainable energy sources or improving energy efficiency has become an inevitable choice for human society to solve serious energy problems. As an effective link to improve energy utilization, energy storage has solved the time and space gap between supply and demand, and improved the feasibility of energy storage and utilization. Among them, thermal energy storage technology (TES), as an imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C01B21/064C01B32/05B01J13/00
CPCB01J13/0091C01B21/0648C01P2002/72C01P2002/82C09K5/063C01B32/05
Inventor 张焕芝荆锐吴博竞孙宗旭冯聪张慎道韩存昊孙立贤徐芬
Owner GUILIN UNIV OF ELECTRONIC TECH
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