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Phase change heat storage composite material and preparation method thereof

A technology of composite materials and phase change heat storage, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of reducing the cycle life of materials, restricting practical applications, and easy precipitation of materials, so as to reduce the time of heat storage and release , Solve the problem of phase separation and enhance the effect of dispersion

Inactive Publication Date: 2019-12-20
ENN GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sodium acetate trihydrate has the same properties as other inorganic hydrates, and there are problems of supercooling and phase separation. During repeated cycles, the material is easy to precipitate, which reduces the cycle life of the material and seriously restricts its practical application.

Method used

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  • Phase change heat storage composite material and preparation method thereof
  • Phase change heat storage composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Weigh 91g of sodium acetate trihydrate, 2g of disodium hydrogen phosphate, and 2g of sodium carboxymethylcellulose. After mixing evenly, place the mixture in a ball mill for grinding until the particle size of the mixture reaches 20 μm-300 μm, then grind and mix The final mixture was added to the reactor, and the temperature of the reactor was set at 65°C. After the mixed material is completely melted, add 5g of deionized water, and then add 2g of graphene powder (sheet thickness 1-10 layers, sheet diameter 3-10μm) into the reaction kettle while stirring at a rotation rate of 1000rpm, and add it for about 20min. After finishing, continue to stir for 30 minutes, let it stand for cooling, and obtain the phase change thermal storage composite material.

Embodiment 2

[0051] Weigh 88.5g of sodium acetate trihydrate, 2.5g of anhydrous sodium acetate, and 2g of sodium polyacrylate. After mixing evenly, place the mixture in a ball mill for grinding until the particle size of the mixture reaches 20 μm-300 μm, and then grind and mix The mixture was added to the reactor, and the temperature of the reactor was set to 70°C. After the mixed material is completely melted, add 4g of deionized water, and then add 3g of wound carbon nanotube powder (diameter 15-20nm, length 5-15μm) into the reactor at a rate of 1500rpm while stirring for about 20min. Stir for 30 minutes, let it stand for cooling, and obtain a phase change thermal storage composite material.

Embodiment 3

[0053] Weigh 93g of sodium acetate trihydrate, 3g of sodium bromide, and 2g of xanthan gum. After mixing evenly, place the mixture in a ball mill for grinding until the particle size of the mixture reaches 20 μm-300 μm, and then add the ground and mixed mixture to Into the reactor, set the temperature of the reactor to 65°C. After the mixed material is completely melted, add 4g of deionized water, then add 1g of nitrogen-doped multilayer graphene powder (sheet thickness 1-10 layers, sheet diameter 3-10 μm, Nitrogen content 5%), add in about 20 minutes, continue to stir for 30 minutes, let it stand for cooling, and obtain a phase change thermal storage composite material.

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Abstract

Relating to the field of renewable energy phase change heat storage materials, the invention provides a phase change heat storage composite material and a preparation method thereof. Relative to existing phase change heat storage composite materials, the phase change heat storage composite material provided by the invention reduces and even eliminates undercooling, solves the phase separation problem, improves the heat conductivity, and has high heat stability and cycling stability. The phase change heat storage composite material comprises the following components: sodium acetate trihydrate,a nucleating agent, a thickening agent, water and a carbon nano-material. The preparation method is used for preparation of the phase change heat storage composite material.

Description

technical field [0001] The invention relates to the field of renewable energy phase change heat storage materials, in particular to a phase change heat storage composite material and a preparation method thereof. Background technique [0002] Due to the excessive exploitation and use of fossil energy in recent years, environmental and ecological problems have become increasingly prominent, seriously affecting and restricting the sustainable development of my country's economy. Therefore, reducing dependence on traditional conventional energy, effectively improving energy utilization efficiency, focusing on developing renewable and clean energy, and realizing sustainable energy utilization have become the focus of global attention. As an important way to improve the efficiency of thermal energy conversion and recycling, energy storage technology not only effectively improves energy utilization efficiency, but also solves the mismatch problem of energy supply and demand in tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张小诗张建祥时培文李金来
Owner ENN GRAPHENE TECH CO LTD
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