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Composite phase-change material, preparation method thereof and phase-change cold storage device

A technology of composite phase change materials and mixtures, applied in heat exchange materials, chemical instruments and methods, heat storage equipment, etc., can solve problems such as poor flame retardancy and thermal stability, and achieve improved thermal stability and low production costs. , the effect of simple components

Inactive Publication Date: 2020-10-16
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a composite phase change material and its preparation method and phase change cold storage device to solve the problem of poor flame retardancy and thermal stability of phase change materials used in rail vehicle cold storage in the prior art question

Method used

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  • Composite phase-change material, preparation method thereof and phase-change cold storage device
  • Composite phase-change material, preparation method thereof and phase-change cold storage device
  • Composite phase-change material, preparation method thereof and phase-change cold storage device

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preparation example Construction

[0031] In one embodiment of the present application, the above preparation method includes: mixing the materials comprising molten paraffin and expanded graphite and performing first stirring to obtain the first mixture; mixing the materials comprising molten hydrotalcite and calcium stearate mixing and performing a second stirring to obtain a second mixture; mixing the first mixture and the second mixture and performing a third stirring to obtain a composite phase change material.

[0032] When the composite phase change material includes paraffin, hydrotalcite, expanded graphite and calcium stearate, since the viscosity of molten paraffin and hydrotalcite is relatively large, the paraffin, hydrotalcite, expanded graphite and calcium stearate are directly mixed, It is easy to cause uneven mixing, thereby affecting the flame retardancy, thermal stability and other properties of the final composite phase change material. The above preparation method first stirs the expanded gra...

Embodiment 1

[0041] Heat 760g of paraffin to 40-45°C, and stop heating after it is in a completely molten state to obtain molten paraffin. Heat 255g of hydrotalcite to 75-80°C, and stop heating after it is in a completely molten state to obtain molten hydrotalcite.

[0042] The molten paraffin and the molten hydrotalcite were mixed and stirred to obtain 1000 g of a composite phase change material, wherein the stirring speed was 1000 r / min, and the stirring time was 2 hours. In terms of mass percentage, the paraffin content in the composite phase change material is 75%, the phase change temperature is 20-25°C, and the hydrotalcite content is 25%.

Embodiment 2

[0044] The difference between embodiment 2 and embodiment 1 is that

[0045] The rotational speed of the first stirring is 500r / min, and the stirring time of the first stirring is 4h, and finally a composite phase change material is obtained. In terms of mass percentage, the paraffin content in the composite phase change material is 75%, and the phase change temperature is 20-25°C. , The hydrotalcite content is 25%.

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Abstract

The invention provides a composite phase change material, a preparation method thereof and a phase change cold storage device. The composite phase change material comprises the following components inpercentage by mass: 75-80% of paraffin and 20-25% of hydrotalcite. The composite phase change material comprises paraffin (base material) and hydrotalcite. When paraffin is physically mixed with hydrotalcite, compared with other crystal type flame retardants, the layered structure of the hydrotalcite and the adjustability of the layered structure of the hydrotalcite are more easily cooperated andcomplemented with the crystal structure of the paraffin; therefore, the organization structure of the composite phase-change material formed by mixing the two components is more uniform and compact,the thermal stability, flame retardance and heat conductivity coefficient of the composite phase-change material are further improved, and the composite phase-change material is simple in component and low in production cost.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a composite phase change material, a preparation method thereof, and a phase change cold storage device. Background technique [0002] With the development of society, the public increasingly chooses rail vehicles such as high-speed rail, bullet trains, and subways to travel, and the requirements for thermal comfort of the riding environment of rail vehicles are also getting higher and higher. The main device for providing a thermally comfortable environment for rail vehicles is the air-conditioning system of the rail vehicle. Due to the limitation of the space conditions of the rail vehicle, the power and cooling capacity of the air-conditioning system are limited. Under the following working conditions, the cooling capacity provided by the air-conditioning system cannot meet the thermal comfort requirements of the passengers in the compartment: 1. The vehicle is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06F28D20/02
CPCC09K5/063F28D20/02Y02E60/14
Inventor 石卫兵李莉魏玲玲张国安
Owner CRRC QINGDAO SIFANG CO LTD
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