Hydrated salt/modified expanded graphite shaped phase-change heat storage material for medium and low temperatures, and preparation method thereof

A technology of expanded graphite and phase change heat storage, applied in heat exchange materials, chemical instruments and methods, climate sustainability, etc., can solve problems such as difficult large-scale application, complicated production process, poor stability, etc., and achieve practicality Strong, simple raw materials, excellent performance

Active Publication Date: 2021-03-30
HUANGGANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although there are many researches on medium and low temperature hydrated salt heat storage materials at home and abroad, these studies mostly focus on the laboratory, and there are various problems, such as complicated production process, high cost, and poor stability after thermal cycling, which lead to It is difficult to apply on a large scale

Method used

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Examples

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Effect test

preparation example Construction

[0030] (2) Preparation of modified expanded graphite: Add 5.00 g of expanded graphite into 500 mL of water, take it out after ultrasonic dispersion for 30 minutes, and then dry it in an oven at 105° C. for 24 hours before use. Put the pretreated expanded graphite into the cavity of the atomic layer deposition system, use tetrakis(dimethylamino)titanium as the deposition source, use ozone as the cleaning source, and the deposition temperature is 150°C, and the deposited titanium oxide is obtained by controlling the number of cycles Modified expanded graphite with a thickness of 5-20nm.

[0031] (3) Preparation of modified barium hydroxide octahydrate: pure barium hydroxide octahydrate accounts for 98.5%, nanometer copper particles (50nm in particle size) are 0.5%, Na 2 SiO 3 ·5H 2 O is 1.0%. The above materials are put into a beaker together, and the modified octahydrate barium hydroxide is obtained through mechanical stirring.

[0032] (4) Preparation process: Mechanically...

Embodiment 1

[0035] The mass ratio of the raw materials is as follows: the modified expanded graphite is 10%; the modified barium hydroxide octahydrate is 90%; and the binder is 3% of the total mass of the expanded graphite and the barium hydroxide octahydrate. The atomic layer deposition of titanium oxide on the surface of expanded graphite has a thickness of 5 nm.

[0036] Mechanically mix the modified expanded graphite and modified barium hydroxide octahydrate, then heat the mixed material to 90°C in the furnace at a heating rate of 5°C / min, keep it warm for about 30min, turn off the power supply, and After cooling, the composite phase change heat storage material is obtained. Then mechanically stir with methyl cellulose, and perform tablet molding under a press to obtain a medium and low temperature hydrated salt / modified expanded graphite shaped phase change heat storage material. The heat storage density of the medium and low temperature hydrated salt / modified expanded graphite shap...

Embodiment 2

[0038] The mass ratio of the raw materials is as follows: the modified expanded graphite is 10%; the modified barium hydroxide octahydrate is 90%; and the binder is 3% of the total mass of the expanded graphite and the barium hydroxide octahydrate. The atomic layer deposition of titanium oxide on the surface of expanded graphite has a thickness of 10nm.

[0039] Mechanically mix the modified expanded graphite and modified barium hydroxide octahydrate, then heat the mixed material to 90°C in the furnace at a heating rate of 5°C / min, keep it warm for about 30min, turn off the power supply, and After cooling, the composite phase change heat storage material is obtained. Then mechanically stir with methyl cellulose, and perform tablet molding under a press to obtain a medium and low temperature hydrated salt / modified expanded graphite shaped phase change heat storage material. The heat storage density of the medium and low temperature hydrated salt / modified expanded graphite shap...

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Abstract

The invention provides a hydrated salt/modified expanded graphite shaped phase change heat storage material for medium and low temperatures, and a preparation method thereof. The phase change heat storage material is composed of barium hydroxide octahydrate, modified expanded graphite and a binder, wherein the mass ratio of the modified barium hydroxide octahydrate to the modified expanded graphite is (80-90%):(10-20%), and the mass of the binder is 1-3% of the total mass of the modified barium hydroxide octahydrate and the modified expanded graphite. The preparation method of the material comprises the following steps: mixing modified barium hydroxide octahydrate and modified expanded graphite in proportion, putting the mixture into a beaker, putting the beaker into a vacuum drying oven for vacuum melting adsorption, and then doping the binder for tabletting molding. According to the invention, the material selection is reasonable, the preparation process is advanced, the efficient medium-low temperature heat storage material can be produced from the nanoscale, the application of the heat storage composite material greatly improves the comprehensive properties including heat storage, heat release efficiency and the like, and the heat storage composite material can be used for industries such as heating, industrial waste heat utilization, electronic device heat dissipation andthe like.

Description

technical field [0001] The invention relates to the field of heat storage materials, in particular to a medium and low temperature hydrated salt / modified expanded graphite shaped phase change heat storage material and a preparation method thereof. Background technique [0002] With the development of human society and economy and the advancement of science and technology, the demand and consumption of energy are increasing day by day. How to effectively utilize energy and improve energy utilization efficiency has become a problem that people pay more and more attention to. Heat storage technology is a simple and effective way to realize energy storage. Among the current heat storage technologies, phase change heat storage technology is relatively cheap, and is widely used in solar thermal storage, building energy saving, waste heat recovery and power peak shifting. Valley filling and other fields. Phase change heat storage materials are the carrier for heat storage, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y02P20/10
Inventor 李儒光方东程晓敏王建宇黄锋万美南施伟利许杨
Owner HUANGGANG NORMAL UNIV
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