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Hierarchical pore metal organic framework composite phase change material and preparation method thereof

A technology of metal-organic framework and composite phase change materials, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of easy leakage, low energy storage density of composite phase change materials, and weakened capillary force, etc., to achieve The effect of preventing leakage

Inactive Publication Date: 2021-06-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the small pore size makes the capillary force of the skeleton strong and firmly binds the phase change material in the pores, the small pore volume makes the energy storage density of the composite phase change material very low.
Although the large pore structure can ensure high energy storage density, as the pore size increases, the capillary force weakens and leakage is prone to occur.

Method used

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  • Hierarchical pore metal organic framework composite phase change material and preparation method thereof
  • Hierarchical pore metal organic framework composite phase change material and preparation method thereof
  • Hierarchical pore metal organic framework composite phase change material and preparation method thereof

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preparation example Construction

[0022] The invention provides a multi-level porous metal organic framework composite phase change material and a preparation method thereof.

[0023] The material includes polyethylene glycol-2000 and hierarchical porous metal-organic framework UiO-66. Wherein, the mass percent content of polyethylene glycol-2000 is 40-60wt%.

[0024] Such as figure 1 Shown is the scanning electron microscope picture of UiO-66 powder material, figure 2 is the nitrogen adsorption-desorption curve of UiO-66 powder material, image 3 It is the pore size distribution curve of UiO-66 powder material.

Embodiment 1

[0027] (1) Take 0.066g polyethylene glycol-2000 phase change material and 0.1g hierarchical porous metal-organic framework UiO-66 and mix them in a 50mL round bottom flask;

[0028] (2) Pour 20mL of absolute ethanol solvent;

[0029] (3) Place the round-bottomed flask in a water bath and stir at a constant temperature of 70°C for 30 minutes to obtain a milky white suspension;

[0030] (4) Pour the suspension into a beaker, and dry it in a drying oven at 80°C for 24 hours until the absolute ethanol is completely volatilized, and the composite material is covered in the bottom of the beaker in the form of a white film. After crushing, a white powder composite phase transition is obtained. Heat storage material.

Embodiment 2

[0032] (1) Take 0.1g polyethylene glycol-2000 phase change material and 0.1g hierarchical porous metal-organic framework UiO-66 and mix them in a 50mL round bottom flask;

[0033] (2) Pour 20mL of absolute ethanol solvent;

[0034] (3) Place the round-bottomed flask in a water bath and stir at a constant temperature of 70°C for 30 minutes to obtain a milky white suspension;

[0035] (4) Pour the suspension into a beaker, and dry it in a drying oven at 80°C for 24 hours until the absolute ethanol is completely volatilized, and the composite material is covered in the bottom of the beaker in the form of a white film. After crushing, a white powder composite phase transition is obtained. Heat storage material.

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Abstract

The invention provides a hierarchical pore metal organic framework composite phase change material and a preparation method thereof, and belongs to the technical field of phase change heat storage materials. The molecular weight of a polyethylene glycol phase change material in the material is 2000, the material compounded with polyethylene glycol is a hierarchical pore metal organic framework UiO-66, and the mass percentage of polyethylene glycol-2000 is 40-60 wt%. The problem of liquid leakage of the phase change material during solid-liquid conversion can be effectively solved, the thermal stability of the composite material can be ensured while the energy storage density is improved, and the composite phase change material can be used for medium and low temperature heat energy storage and can be used for preparing materials suitable for medium and low temperature heat storage.

Description

technical field [0001] The invention relates to the technical field of phase-change heat storage materials, in particular to a multi-level porous metal-organic framework composite phase-change material and a preparation method thereof. Background technique [0002] At present, phase change energy storage technology has attracted much attention because of its ability to achieve efficient energy utilization. When the energy is in excess, the phase change material absorbs heat and undergoes a solid-liquid phase transition to store energy in the form of latent heat. On the contrary, when energy is needed, the phase change material undergoes a liquid-solid transition and releases the stored energy, thereby realizing the conversion and utilization of energy in time and space. Phase change materials have been used in solar energy, construction, power electronics, textiles, aerospace and military and other fields. However, a single phase change material is prone to leakage and cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 冯黛丽李培冯妍卉林凡张欣欣
Owner UNIV OF SCI & TECH BEIJING