Composite phase change material with high thermal conductivity and preparation method thereof

A composite phase change material and high thermal conductivity technology, which is applied in the field of high thermal conductivity composite phase change materials and its preparation, can solve the problems of poor compatibility between carbon-based thermal conductive fillers and fatty acids, limited thermal conductivity enhancement effect, and thermal conductivity failure. Achieve the effects of avoiding thermal conductivity failure, preventing agglomeration, and high thermal conductivity

Inactive Publication Date: 2016-04-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following main problems in the prior art: (1) the poor dispersion of carbon-based nano-fillers leads to limited thermal conductivity enhancement effect, and the thermal conductivity of composite phase change materials needs to be further imp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] (1) Add 1g of nano-graphite flakes into 200mL of melamine N,N-dimethylsulfoxide solution with a mass concentration of 3% under stirring, stir at 1000rpm for 4 hours, and then ultrasonically disperse for 30 minutes (ultrasonic frequency 25KHZ, power 300W), after filtering and drying, the surface-modified nano-graphite sheet can be obtained.

[0026] (2) Take 10g of stearic acid and heat it to melt, then add the surface-modified graphite nano flakes into the stearic acid melt, continue to heat ultrasonically for 50 minutes (ultrasonic frequency 25KHZ, power 300W) to make the graphite nano flakes evenly dispersed in the stearic acid melt Stearic acid melt, and finally pour the mixture into a standard mold and let it cool naturally to room temperature to solidify and form, that is, a high thermal conductivity composite phase change material is obtained. Wherein the mass content of the surface-modified nano-graphite sheet in the composite material is 5%. ...

Example Embodiment

[0028] Example 2

[0029] (1) Add 1.6g of nano-graphite flakes under stirring into 400mL mass concentration of 2% sodium humate aqueous solution, stir at 1200rpm for 3 hours, and then ultrasonically disperse for 30 minutes (ultrasonic frequency 25KHZ, power 200W). After filtering and drying, the surface-modified nano-graphite sheet is obtained.

[0030] (2) Weigh 10g of myristic acid and heat it to melt, then add the surface-modified nano-graphite flakes into the myristic acid melt, continue to heat ultrasonically for 70 minutes (ultrasonic frequency 25KHZ, power 500W) to make the graphite flakes evenly disperse the nutmeg acid melt, and finally pour the mixed solution into a standard mold and naturally cool to room temperature to solidify and form to obtain a high thermal conductivity composite phase change material. Wherein the mass content of the surface-modified nano-graphite sheet in the composite material is 8%.

[0031] In addition, as a comparative example, a composi...

Example Embodiment

[0032] Example 3

[0033] (1) 0.5g graphene was added under stirring into 50mL of dopamine aqueous solution with a mass concentration of 3%, after stirring at 2000rpm for 5 hours, followed by ultrasonic dispersion for 40 minutes (ultrasonic frequency 25KHZ, power 500W), filtered and dried Afterwards, the surface-modified graphene is obtained.

[0034] (2) Weigh 10g of lauric acid and heat it to melt, then add surface-modified graphene into the lauric acid melt, continue to heat ultrasonically for 20 minutes (ultrasonic frequency 25KHZ, power 100W) to evenly disperse the graphene in the lauric acid melt Finally, pour the mixture into a standard mold and cool it down to room temperature to solidify and form to obtain a high thermal conductivity composite phase change material. Wherein the mass content of the surface-modified graphene in the composite phase change material is 2%.

[0035] In addition, as a comparative example, a composite phase change material was prepared by m...

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Abstract

The invention belongs to the technical field of composite materials and discloses a composite phase change material with high thermal conductivity and a preparation method thereof. The composite phase change material comprises a surface modified carbon-based nanometer thermal conductive filler and aliphatic acid. The surface modified carbon-based nanometer thermal conductive filler is one of surface modified nano-graphite flake, graphene or carbon nanotube. The aliphatic acid is one component selected from decylic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid and arachidic acid or a mixture of two components selected from decylic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid and arachidic acid. The preparation method comprises the following steps: carrying out surface modification on a carbon-based nanometer thermal conductive filler by the use of melamine, sodium humate or dopamine and adding the surface modified carbon-based nanometer thermal conductive filler into a aliphatic acid melt; and uniformly mixing for melt blending and introducing the melt blending product into a mold, and carrying out curing molding so as to obtain the composite phase change material with high thermal conductivity. The composite phase change material with high thermal conductivity has excellent thermal conductivity and stable performance, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a high thermal conductivity composite phase change material and a preparation method thereof. Background technique [0002] With the increasing demand for energy in modern society and the depletion of fossil fuels, thermal energy storage technology, as a new technology to improve energy utilization, has been developing rapidly like never before. Commonly used phase change energy storage materials mainly include paraffins, organic fatty acids and inorganic hydrated salts. Among them, organic fatty acids are popular because of their high melting enthalpy, no supercooling and precipitation, non-toxic and non-corrosive, small volume expansion rate during solid-liquid phase transition, stable performance, and low price. However, the low thermal conductivity of fatty acid phase change materials makes the heat transfer performance of the heat storage system poor...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 裴丽霞王雪银张立志
Owner SOUTH CHINA UNIV OF TECH
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