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Phase change material and preparation method thereof

A technology of phase change materials and raw materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems affecting the timely release and utilization of heat, complex preparation process of phase change materials, and many types of raw materials used, so as to achieve fewer types , the phase change process is reversible, and the effect of large heat storage capacity

Inactive Publication Date: 2015-03-18
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, KF·4H 2 O is corrosive to a certain extent, while Mn(NO 3 ) 2 ·6H 2 The latent heat of O is too low, and it needs to be adjusted to obtain a suitable phase transition temperature
At the same time, the existing inorganic phase change materials are prone to supercooling, which affects the timely release and utilization of heat, and the preparation process of phase change materials is complicated, and there are many types of raw materials used, and the cost of raw materials is high

Method used

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  • Phase change material and preparation method thereof

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preparation example Construction

[0027] see figure 1 , the invention also discloses a preparation method of a phase change material, comprising the following steps:

[0028] First, weigh the calcium chloride hexahydrate GaCl 2 ·6H 2 O, the strontium chloride hexahydrate SrCl 2 ·6H 2 O. The melting point regulator is prepared by mixing the above raw materials according to the parts by mass to prepare a solution. The melting point regulator can be the magnesium chloride hexahydrate MgCl 2 ·6H 2 O, the magnesium nitrate Mg (NO 3 ) 2 , the potassium nitrate KNO 3 , one of the sodium chloride NaCl.

[0029] Wherein, the calcium chloride hexahydrate GaCl 2 ·6H 2 O is prepared by cooling crystallization method. anhydrous calcium chloride GaCl 2Grind it into powder to prepare a solution, heat the solution, prepare a supersaturated solution according to its solubility, and then put it in a cold water bath to cool down until it is completely crystallized, pour off the residual solution, and dry it at low t...

Embodiment 1

[0036] First, weigh the phase change main agent calcium chloride hexahydrate GaCl 2 ·6H 2 O15g, nucleating agent strontium chloride hexahydrate SrCl 2 ·6H 2 O 0.75g, melting point regulator sodium chloride 0.5g, thickener sodium hydroxymethylcellulose (carboxymethylcellulose sodium, NaCMC) 0.25g and water 2.5g, the above raw materials were mixed and prepared into a solution.

[0037] Then, heat the prepared solution in a constant temperature water bath at 60-80° C. and keep stirring until all the raw materials are melted and the solution becomes a transparent liquid.

[0038] Next, crystallize the transparent liquid at a low temperature of 4-6°C to complete the storage and release of initial energy and obtain a phase change material.

[0039] The phase change temperature of the prepared phase change material is 31° C., and the latent heat of phase change is 168 J / g.

Embodiment 2

[0041] First, weigh the phase change main agent calcium chloride hexahydrate GaCl 2 ·6H 2 O15g, nucleating agent strontium chloride hexahydrate SrCl 2 ·6H 2 O0.45g, melting point regulator magnesium nitrate Mg (NO 3 ) 2 0.6g and 2.5g of water, the above raw materials were mixed and prepared into a solution.

[0042] Then, heat the prepared solution in a constant temperature water bath at 60-80° C. and keep stirring until all the raw materials are melted and the solution becomes a transparent liquid.

[0043] Next, crystallize the transparent liquid at a low temperature of 4-6°C to complete the storage and release of initial energy and obtain a phase change material.

[0044] The phase change temperature of the prepared phase change material is 30° C., and the latent heat of phase change is 150 J / g.

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Abstract

The invention discloses a phase change material and a preparation method thereof. The phase change material comprises the following preparation raw materials: calcium chloride hexahydrate, strontium chloride hexahydrate and a melting point regulator, wherein the raw materials comprise the following components in percentage by mass: 80-90% of calcium chloride hexahydrate, 5-10% of strontium chloride hexahydrate and 5-10% of the melting point regulator. The preparation method of the phase change material specifically comprises the following steps: weighing calcium chloride hexahydrate, strontium chloride hexahydrate and the melting point regulator, and mixing the raw materials according to mass parts to prepare a solution; heating the solution in a constant-temperature water bath at 60-80 DEG C, and continuously stirring until the raw materials are completely molten and the solution becomes a transparent liquid; and crystallizing the transparent liquid at a low temperature of 4-6 DEG C to obtain the phase change material. The phase change material disclosed by the invention is simple in preparation process, only needs three steps namely mixing, melting and crystallization, and is less in adopted raw material type and cheap and easily-available in raw material; and the prepared phase change material is non-toxic and non-corrosive, the phase change temperature can be adjusted between 24 DEG C and 31 DEG C, the latent heat of phase change is 120-170J / g, the super-cooling degree is less than 10 DEG C, and the phase change process is reversible.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, and in particular relates to a phase change material and a preparation method thereof. Background technique [0002] Phase change material (PCM-Phase Change Material) refers to a substance whose physical properties change with temperature changes and can provide latent heat. The process of changing physical properties is called a phase change process, at this time the phase change material will absorb or release a large amount of latent heat and keep the temperature constant. For example, at 0°C, 1Kg of ice needs to absorb 333KJ of heat to completely turn into water, and the temperature remains at 0°C during this process. In terms of constant temperature storage of food, constant temperature of textiles, and constant temperature energy-saving lamps of buildings, phase change materials have great market demand and potential. [0003] At present, there are mainly three kinds of pha...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/06
Inventor 王维张慧洁张哲明陈海滨吴景深
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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