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Composite phase change material for segmented heat storage and preparation method thereof

A composite phase change material and phase change material technology, which is applied in the field of segmented heat storage composite phase change materials and their preparation, can solve the problems of application field limitations, unsuitable performance of hydrated salt phase change materials, etc., and achieve thermal relief. load effect

Active Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the phase change heat storage material prepared by this technology has multi-phase change point properties, its multi-phase change point characteristics come from the physical mixing of two organic phase change materials. This invention is not suitable for hydrated salt phase change materials with excellent performance. Field of application subject to great restrictions

Method used

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  • Composite phase change material for segmented heat storage and preparation method thereof
  • Composite phase change material for segmented heat storage and preparation method thereof
  • Composite phase change material for segmented heat storage and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing a staged heat storage composite phase change material, comprising the following steps:

[0043] 1) Weigh 50g of paraffin wax with a phase transition temperature of 56°C, heat and melt on a magnetic stirrer, and control the temperature to 60°C. After adding 1.5g of Span 80 emulsifier and stirring at a speed of 1000r / min for 20min, component A was obtained.

[0044] 2) Weigh 20 g of calcium chloride hexahydrate, heat and melt, add 0.5 g of strontium chloride, control the temperature at 60° C., and stir magnetically for 10 minutes to obtain component B.

[0045] 3) Slowly add component B to component A at a rotating speed of 1000r / min, and continue stirring for 60 minutes to obtain a phase-change emulsion in which paraffin is the continuous phase and calcium chloride hexahydrate is the dispersed phase. After cooling to room temperature, a solid staged heat storage composite phase change material is obtained.

[0046] figure 1 DSC diagram of the st...

Embodiment 2

[0051] 1) Weigh 80g of microcrystalline wax with a phase transition temperature of 78°C, heat and melt on a magnetic stirrer, and control the temperature to 88°C. After adding 2g of propylene glycol monostearate and stirring at a speed of 2000r / min for 50min, component A was obtained.

[0052] 2) Weigh 40 g of sodium acetate trihydrate, heat and melt, add 3 g of disodium hydrogen phosphate dodecahydrate, control the temperature at 88° C., and stir magnetically for 20 minutes to obtain component B.

[0053] 3) Slowly add component B to component A at a rotating speed of 2000r / min, and continue stirring for 30 minutes to obtain a phase-change emulsion in which microcrystalline wax is the continuous phase and sodium acetate trihydrate is the dispersed phase. After cooling to room temperature, a solid staged heat storage composite phase change material is obtained.

[0054] figure 2 DSC diagram of the staged heat storage composite phase change material prepared in Example 2. T...

Embodiment 3

[0056] A method for preparing a staged heat storage composite phase change material, comprising the following steps:

[0057] 1) Weigh 40g of stearic acid whose phase transition temperature is 67.5°C, heat and melt on a magnetic stirrer, and control the temperature to 70°C. After adding 1.0 g of ethylene glycol fatty acid ester and stirring at a speed of 1500 r / min for 30 min, component A was obtained.

[0058] 2) Weigh 10 g of sodium sulfate decahydrate, heat and melt, add 1.0 g of borax, control the temperature at 70° C., and stir magnetically for 15 minutes to obtain component B.

[0059] 3) Slowly add component B to component A at a rotating speed of 500 r / min, and continue stirring for 45 minutes to obtain a phase-change emulsion in which stearic acid is the continuous phase and sodium sulfate decahydrate is the dispersed phase. After cooling to room temperature, a solid staged heat storage composite phase change material is obtained.

[0060] image 3 DSC diagram of t...

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Abstract

The invention discloses a segmented heat storage composite phase change material and a preparation method thereof. The composite phase change material comprises the following raw materials in percentage by mass: 15-50% of a hydrated salt phase change material, 0.5-3% of a nucleating agent, 1-2.5% of an emulsifier, and 55-80% of an organic phase change material. The preparation method comprises thesteps of melting the organic phase change material by heating, maintaining the temperature higher than the phase change temperature of the organic phase change material by 1-10 DEG C, adding the emulsifier, and stirring to obtain a uniform mixture; heating the hydrated salt phase change material till melting, adding the nucleating agent, controlling the temperature of the hydrated salt phase change material to be the same as the temperature of the mixture, and stirring to mix the hydrated salt phase change material and the nucleating agent uniformly; mixing the two materials while stirring toobtain a water-in-oil phase change emulsion, so as to obtain a solid segmented heat storage composite phase change material. The sum of latent heat of the two phase changes of the material reaches 162.7-204.7 J / g, and the problem of volatilization of free water produced after the hydrated salt is melted is solved.

Description

technical field [0001] The invention relates to the field of phase-change heat storage materials, in particular to a composite phase-change material capable of segmented heat storage and a preparation method thereof. Background technique [0002] Phase change materials are an important class of energy materials, which are widely used in building energy saving, industrial waste heat recovery, solar energy, computer room cooling, industrial and domestic heating. Phase change materials absorb or release a large amount of heat during the phase change process, have the advantages of high heat storage density and narrow phase change temperature range, and play an important role in the field of energy storage. [0003] Phase change materials are mainly divided into organic phase change materials and inorganic phase change materials. The inorganic phase change materials used in the low and medium temperature range are mainly hydrated salt materials. For example, sodium acetate tri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 袁文辉肖强强王爱业李莉
Owner SOUTH CHINA UNIV OF TECH
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