Nano thermal conductivity enhanced microcapsule composite phase change material and preparation method thereof

A technology of enhanced thermal conductivity and energy storage materials, applied in the direction of microcapsule preparations, heat exchange materials, microsphere preparation, etc., can solve the problems of low thermal conductivity, achieve broad application prospects, excellent thermal conductivity and stability, and improve energy The effect of using efficiency

Active Publication Date: 2016-11-09
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problem of low thermal conductivity existing in the prior art of microcapsules, the present invention provides a microcapsule composite phase-change energy storage material with enhanced nano-thermal conductivity and a preparation method thereof

Method used

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  • Nano thermal conductivity enhanced microcapsule composite phase change material and preparation method thereof
  • Nano thermal conductivity enhanced microcapsule composite phase change material and preparation method thereof
  • Nano thermal conductivity enhanced microcapsule composite phase change material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1, modification of BN

[0039] Weigh 3 g BN and add 50% sodium hydroxide solution, 70 o C, heated in a water bath for 2 h, and filtered with suction at 80 o C dry for 24 h.

[0040] Step 2, the emulsification process of organic phase change materials

[0041] Firstly, the BN nano thermal conductivity enhanced particles were mixed with the organic phase change material and ultrasonically dispersed for 30 min to form a uniform dispersion. Then this dispersion liquid is mixed with emulsifier, solvent, after 50 o C, stirring and emulsifying at 1200 rpm for 2 h to form a stable and uniform emulsion.

[0042] Step 3, adding BN nanometer heat conduction to enhance the preparation of particle wall material prepolymer

[0043] The modified BN nano heat conduction enhancing particles are ultrasonically dispersed and evenly mixed with the microcapsule wall material raw materials, and copolymerized under certain conditions to form a prepolymer.

[0044] Step 4, preparation...

Embodiment 2

[0047] Step 1, modification of CNT

[0048] Weigh 1.2 g CNT, add 50 ml concentrated sulfuric acid, stir magnetically for 15 min, ultrasonicate for 1 h, then add 50 ml concentrated nitric acid, stir magnetically for 15 min, place at 140 o Reflux reaction in the oil bath of C for 2 h, after cooling, diluting, filtering, drying, grinding, ultrasonication for later use.

[0049] Step 2, the emulsification process of organic phase change materials

[0050] Firstly, the CNT nano thermal conductivity enhanced particles were mixed with the organic phase change material and ultrasonically dispersed for 30 min to form a uniform dispersion. Then this dispersion liquid is mixed with emulsifier, solvent, after 50 o C, stirring and emulsifying at 1200 rpm for 2 h to form a stable and uniform emulsion.

[0051] Step 3, adding CNT nano thermal conductivity to enhance the preparation of particle wall material prepolymer

[0052] The modified CNT nano heat conduction enhancing particles are...

Embodiment 3

[0056] Step 1, Preparation of GO

[0057] Weigh 3 g of graphite and 18 g of potassium permanganate and mix, add 360ml / 40ml of concentrated sulfuric acid / concentrated phosphoric acid mixed solution, stir at 50°C for 12 hours, then cool to room temperature. Add 400 ml of ice and 3 ml of 30% hydrogen peroxide solution, the color of the solution turns bright yellow. Wash with 5% hydrochloric acid and deionized water three times until the solution is neutral. The resulting solution was dried at 80°C, ground, and ultrasonicated for 1 hour to finally obtain graphene oxide.

[0058] Step 2, the emulsification process of organic phase change materials

[0059] First, the GR nano thermal conductivity enhanced particles were mixed with the organic phase change material and ultrasonically dispersed for 30 min to form a uniform dispersion. Then this dispersion liquid is mixed with emulsifier, solvent, after 50 o C, stirring and emulsifying at 1200 rpm for 2 h to form a stable and unifo...

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Abstract

The present invention discloses nano thermal conductivity enhanced microcapsule composite phase change material and a preparation method thereof, nano thermal conductivity enhancing material is high thermal conductivity nanoparticles such as boron nitride (BN), carbon nanotubes (CNTs) or graphene oxide (GO), and a microcapsule core material is organic phase change material. The phase change material, an emulsifier and a solvent are mixed and prepared according the preparation method of the invention to obtain thermal conductivity enhanced microcapsule composite phase change material based on nanoparticles such as BN, CNTs and GO, wherein all the added BN, CNTs and GO are modified to comprise hydroxyl groups. In addition, it is possible to add the nano thermal conductivity enhancing particles such as BN, CTNs or GR into the core material of the microcapsule core material according to actual needs. The composite phase change material prepared herein has high phase change enthalpy, good thermal cycle stability, excellent thermal conductivity and the like, has a simple preparation process, stable structure and high encapsulation rate and is widely applicable.

Description

technical field [0001] The invention relates to the technical field of phase change material microcapsules, in particular to a microcapsule composite phase change energy storage material with enhanced nanometer heat conduction and a preparation method thereof. Background technique [0002] With the development of economy and the advancement of science and technology, traditional energy is being consumed at an alarming rate, and human beings are facing unprecedented energy shortages. There are two basic ways to solve this problem: one is to develop renewable energy; the other is to improve energy efficiency. Therefore, energy storage is particularly important. Thermal energy storage systems offer possibilities for energy storage, and latent heat storage is the most efficient way to store thermal energy. Phase change material (Phase Change Material, PCM) is a material that uses the heat absorption and heat release characteristics of substances during the phase change process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C09K5/14B01J13/18
CPCB01J13/185C09K5/063C09K5/14
Inventor 张焕芝崔韦唯夏永鹏孙立贤徐芬梁红萍李克
Owner GUILIN UNIV OF ELECTRONIC TECH
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