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Polylol compound phase-change material and preparation method thereof

A composite phase change material and polyol technology are applied in the field of polyol composite phase change materials and their preparation, which can solve the problems of increasing the complexity of the processing process, inconvenient application, high phase change enthalpy, etc. The effect of low degree of subcooling and high phase transformation enthalpy

Active Publication Date: 2017-01-04
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the above method can significantly reduce the undercooling degree of butanetetol, it is not convenient to apply in the process of thermal energy storage, especially when the mixture of butanetetol and other substances increases the complexity of the treatment process
Mixing different types of fatty alcohols in an appropriate ratio to form a mixture can obtain a composite phase change material with high phase change enthalpy and low subcooling, but there are very few studies on this aspect

Method used

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  • Polylol compound phase-change material and preparation method thereof

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Effect test

Embodiment 1

[0024] Firstly, the powders of butylene glycol, pentaerythritol and xylitol are mixed, and the raw material ratio is: 75 wt % of tetramethritol, 24 wt % of pentaerythritol, and 1 wt % of xylitol. The mixture was manually ground for 3 h to form a well-mixed powder. Then, the mixed powder was heated to 185° C. in an oven and kept for 3 hours until all the powders were completely melted to form a transparent liquid. Finally, the transparent liquid is naturally cooled to room temperature to form a white solid polyol composite phase change material.

[0025] The phase change enthalpy of the polyol composite phase change material is 260kJ / kg, the phase change temperature is 115.03°C, and the degree of supercooling drops to 50°C.

Embodiment 2

[0027] Firstly, get butanthritol, pentaerythritol and xylitol powder and mix, and its raw material ratio is: butanthritol 72wt%, pentaerythritol 26wt%, xylitol 2wt%. The mixture was ball milled for 2 h to form a uniformly mixed powder. Then, the mixed powder was heated to 190° C. in an oven, and kept for 1 hour until all the powders were completely melted to form a transparent liquid. Finally, the transparent liquid is naturally cooled to room temperature to form a white solid polyol composite phase change material.

[0028] The phase change enthalpy of the polyol composite phase change material is 242kJ / kg, the phase change temperature is 115.07°C, and the degree of supercooling drops to 43°C.

Embodiment 3

[0030] Firstly, the powders of butylene glycol, pentaerythritol and xylitol are mixed, and the raw material ratio is: 70 wt % of tetramethritol, 27 wt % of pentaerythritol, and 3 wt % of xylitol. The mixture was sand milled for 1 h to form a uniformly mixed powder. Then, the mixed powder was heated to 188° C. in an oven, and kept for 2 hours until all the powders were completely melted to form a transparent liquid. Finally, the transparent liquid is naturally cooled to room temperature to form a white solid polyol composite phase change material.

[0031] The phase change enthalpy of the polyol composite phase change material is 234kJ / kg, the phase change temperature is 115.12°C, and the supercooling degree drops to 39°C.

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Abstract

The invention relates to a polylol compound phase-change material and a preparation method thereof. The compound phase-change material takes butantetraol, pentaerythrotol and xylitol powder as raw materials and is prepared through the following steps: carrying out manual grinding, ball milling or sand milling on a mixture of the butantetraol, the pentaerythrotol and the xylitol for 1h to 3h; then heating the mixture at 185 DEG C to 190 DEG C for 3h to 6h until all the powder is completely melted to form transparent liquid; finally, naturally cooling the transparent liquid to form the white and solid polylol compound phase-change material, wherein the mass percent content of the butantetraol is 60 percent to 75 percent, the mass percent content of the pentaerythrotol is 24 percent to 35 percent and the mass percent content of the xylitol is 1 percent to 5 percent. The polylol compound phase-change material has the advantages of high phase-change enthalpy value, small super-cooling degree, stable melting point and the like, and can be used in the fields of solar heat energy storage, industrial residual heat recycling and the like.

Description

technical field [0001] The invention relates to a composite phase change material, in particular to a polyol composite phase change material and a preparation method thereof. Background technique [0002] Phase change materials use the characteristics of a large amount of heat absorption and release during the solid-solid, solid-liquid, solid-gas phase transition process for thermal energy storage and thermal management. It has the advantages of high energy storage density and small temperature changes during the heat absorption and release process, and is widely used Applied to thermal energy storage and thermal management. Commonly used phase change materials include aliphatic hydrocarbons, fatty alcohols, fatty acids, and inorganic salts containing crystal water. Among them, the phase change enthalpy of aliphatic alcohol phase change materials is significantly higher than that of other phase change materials, for example, the phase change enthalpy of butanethritol reache...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李俊峰卢鹉罗正平赵立波金珂
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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