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Inorganic salt-expanded graphite block composite phase change material and preparation method thereof

A technology of composite phase change materials and expanded graphite, which is applied in the field of preparation of inorganic salt-expanded graphite block composite phase change materials, can solve the limitation of industrial design and application, reduce thermal conductivity and volumetric thermal energy storage density, and composite phase change Problems such as high volume expansion rate of material blocks

Inactive Publication Date: 2017-06-20
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume expansion rate of the composite phase change material block obtained by this method is high, which will reduce the thermal conductivity and volumetric thermal energy storage density of the expected design, which limits industrial design and application

Method used

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  • Inorganic salt-expanded graphite block composite phase change material and preparation method thereof
  • Inorganic salt-expanded graphite block composite phase change material and preparation method thereof
  • Inorganic salt-expanded graphite block composite phase change material and preparation method thereof

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preparation example Construction

[0025] The invention provides a method for preparing an inorganic salt-expanded graphite block composite phase change material, which comprises the following steps:

[0026] (1) After mixing the inorganic salt and expanded graphite, pulverize and stir to obtain a mixture; the rotational speed of the pulverization and stirring is 15000 to 20000 r / min;

[0027] (2) After mixing the mixture and expanded graphite, stir to obtain an inorganic salt-expanded graphite mixture; the rotational speed of the stirring is 15-30 r / min;

[0028] (3) After compacting the inorganic salt-expanded graphite mixture, heat treatment is performed to obtain an inorganic salt-expanded graphite block composite phase change material.

[0029] In the present invention, the inorganic salt and the expanded graphite are mixed and then pulverized and stirred to obtain a mixture. In the present invention, the rotation speed of the grinding and stirring is 15000 to 20000 r / min, preferably 16000 to 19000 r / min, more pre...

Embodiment 1

[0042] Add 2.9g magnesium chloride powder, 5.1g potassium chloride powder and 0.4g 150-mesh expanded graphite particles (using expandable graphite to be expanded by 800W microwave oven for 30s) into the 15000r / min high-speed pulverizer, and then proceed Stir at high speed for 30 seconds to form a homogeneous mixture; mix the obtained mixture with 1.6g of expanded graphite particles with 150 meshes under low-speed mechanical stirring at a speed of 30r / min and a stirring time of 1min to obtain an inorganic salt-expanded graphite mixture ; The inorganic salt-expanded graphite mixture is added to the briquetting mold, and the briquetting machine is used for briquetting. The briquetting pressure is 20MPa, the pressure holding time is 5min, and the briquette density is 1500kg / m 3 ; Put the obtained block into a 500°C heating furnace (heating rate of 5°C / min) for 1 h to obtain an inorganic salt-expanded graphite block composite phase change material.

[0043] The mass fraction of inorgan...

Embodiment 2

[0051] Add 3g of magnesium chloride powder, 5.5g of potassium chloride powder and 0.4g of expanded graphite particles with a mesh of 100 meshes into a 18000r / min high-speed pulverizer, and stir at high speed for 20s to form a uniform mixture; combine the obtained mixture with 1.1g of expanded graphite particles with a mesh size of 100 are subjected to low-speed mechanical stirring at a speed of 20r / min and stirred for 2 minutes to form an inorganic salt-expanded graphite mixture; the inorganic salt-expanded graphite mixture is subjected to briquetting treatment using a briquetting machine. , The pressure of the briquette is 15MPa, the holding time is 4min, and the density of the resulting block is 1200kg / m 3 ; Put the obtained block into a 500 ℃ heating furnace (heating rate of 8 ℃ / min) for 2 h to obtain an inorganic salt-expanded graphite block composite phase change material.

[0052] The mass fraction of inorganic salt in the obtained inorganic salt / expanded graphite block bulk...

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Abstract

The invention provides an inorganic salt-expanded graphite block composite phase change material and a preparation method thereof. The preparation method comprises the following steps: (1) mixing inorganic salt and expanded graphite, and smashing and stirring to obtain a mixture, wherein the revolving speed during smashing and stirring is 15,000 to 20,000r / min; (2) mixing the mixture and the expanded graphite, and stirring to obtain an inorganic salt-expanded graphite mixture, wherein the revolving speed during stirring is 15 to 30r / min; (3) briquetting the inorganic salt-expanded graphite mixture, and performing heat treatment to obtain the inorganic salt-expanded graphite block composite phase change material. In the preparation method, the expanded graphite and the inorganic salt are mixed uniformly through stepwise stirring mixing, so that the expanded graphite and the inorganic salt are connected more firmly after briquetting, and the inorganic salt is fully adsorbed into pores of the expanded graphite after being fused, thereby lowering the volume expansion ratio of the composite phase change material, and enhancing the heat stability.

Description

Technical field [0001] The invention relates to the technical field of composite phase change materials, in particular to a method for preparing inorganic salt-expanded graphite block composite phase change materials. Background technique [0002] Inorganic salt phase change materials have the advantages of high energy storage density, low price, wide distribution, etc., and have important applications in industrial waste heat and waste heat recovery, solar thermal power generation and other fields. However, inorganic salt phase change materials also have strong corrosiveness, low thermal conductivity, and liquid phase flow and leakage problems after solid-liquid phase transition, which greatly restricts their performance and applications. [0003] The composite phase change heat storage material can not only overcome the defects of a single phase change heat storage material, but also improve the application effect of the phase change material and expand its application range. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张正国方晓明柳俊万高学农徐涛袁文辉方玉堂
Owner SOUTH CHINA UNIV OF TECH
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