Shaped phase-change material with high heat-conducting property and preparation method thereof

A technology of shape-setting phase change materials and high thermal conductivity, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., to achieve the effects of high phase change heat storage capacity, easy availability of raw materials, and simple preparation methods

Inactive Publication Date: 2015-07-08
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can effectively improve the apparent thermal conductivity of phase change materials, but the applied objects are all solid-liquid phase change materials. rarely reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put the flake-like expandable graphite in a beaker, place the beaker in a microwave oven, and expand it at medium heat for 60 seconds to obtain worm-like expandable graphite. Take 0.21g of worm-like expandable graphite and 10mL of ethanol and mix it with ethanol for 60 minutes. Add 2.0g of ten Hexaic acid, continue to sonicate for 30 minutes, and then remove the ethanol by rotary evaporation to obtain the expanded graphite flake / hexadecanoic acid solid mixture.

[0017] The expanded graphite flake / hexadecanoic acid solid mixture was mixed with 0.5g of cetyltrimethylammonium bromide, 100mL of water and 0.45g of aniline, placed in a water bath at 70°C, and stirred for 1 hour to obtain a stable emulsion.

[0018] Keep the stirring speed constant, and change the 70°C water bath to a cold water bath until the temperature of the emulsion drops to 20-25°C.

[0019] Keep the temperature of the emulsion at 20-25°C, slowly add 10mL of aqueous solution containing 1.103g of ammoniu...

Embodiment 2

[0025] Put the flake-like expandable graphite in a beaker, place the beaker in a microwave oven, and expand for 60 seconds at medium heat to obtain worm-like expandable graphite. Take 0.11g of worm-like expandable graphite and 10mL of acetone and mix it with ultrasonic treatment for 2 hours. Add 2.06g of ten octadecanoic acid, continued sonication for 15 minutes, and then rotovaped off the acetone to obtain a mixture of expanded graphite flakes / octadecanoic acid solids.

[0026] The expanded graphite flake / stearic acid solid mixture was mixed with 0.54g of sodium dodecylbenzenesulfonate, 90mL of water and 0.58g of aniline, placed in a water bath at 75°C, and stirred for 30 minutes to obtain a stable emulsion.

[0027] Keep the stirring speed constant, and change the 75°C hot water bath into an ice water bath until the temperature of the emulsion drops to 0-5°C.

[0028] Keep the temperature of the emulsion at 0-5°C, slowly add 10 mL of aqueous solution containing 1.42 g of amm...

Embodiment 3

[0034] Put the flake-like expandable graphite in a beaker, place the beaker in a microwave oven, and expand it at medium heat for 90 seconds to obtain worm-like expandable graphite. Take 0.16g of worm-like expandable graphite and 10mL of methanol and mix it with methanol for 90 minutes. Add 2.0g of ten Tetraacid, continued sonication for 30 minutes, then rotary evaporated to remove methanol to obtain expanded graphite flakes / myristic acid solid mixture.

[0035] The expanded graphite flake / myristic acid solid mixture was mixed with 0.4g of sodium dodecylsulfonate, 100mL of water and 0.52g of aniline, placed in a water bath at 65°C, and stirred for 45 minutes to obtain a stable emulsion.

[0036] Keep the stirring speed constant, and change the 65°C hot water bath into a cold water bath until the temperature of the emulsion drops to 20-25°C.

[0037] Keep the temperature of the emulsion at 20-25°C, slowly add 15 mL of aqueous solution containing 1.29 g of ammonium persulfate in...

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Abstract

The invention relates to a shaped phase-change material with high heat-conducting property, and the shaped phase-change material takes long-chain fatty acid as a phase-change heat storage material, polyaniline as a support material and an expanded graphite flake as a heat-conducting reinforcing filler. The shaped phase-change material is prepared through the following steps of: mixing the expanded graphite flake, the long-chain fatty acid and aniline to form an emulsion in water under the action of a surface active agent, and then adding ammonium persulfate to initiate the polymerization reaction of the aniline; and after the reaction is completed, filtering, washing and drying to obtain a product. When the shaped phase-change material is prepared, the usage amount of the long-chain fatty acid is not more than 76% of the mass sum of the expanded graphite flake, the aniline and the long-chain fatty acid, and the usage amount ratio of the expanded graphite flake to the aniline is 4-8:17-21. The shaped phase-change material disclosed by the invention has the advantages of simple preparation process, low cost and good heat-conducting property, can still keep the solid state and be stable in shape when the temperature of the product is higher than a phase-change point and can be widely used for multiple occasions, such as a solar heat utilization and intelligentized automatic air-conditioning building, a glass house, a phase-change energy storage type air conditioner, and the like.

Description

technical field [0001] The invention relates to a shape-setting phase-change material with excellent thermal conductivity and a preparation method thereof, in particular to a shape-setting phase-change material with relatively high latent heat of phase change, which is solid and stable in shape when the temperature is lower than or higher than its phase-change temperature, and Composite shape-setting phase-change material with excellent thermal conductivity and preparation method thereof. Background technique [0002] Energy and environmental issues are one of the bottlenecks restricting economic and social development. At present, society's energy demand continues to increase while traditional fossil energy reserves are gradually depleting. Therefore, how to improve energy utilization efficiency and efficiently develop and utilize clean energy such as solar energy is of great significance to the healthy development of the economy and society. Thermal energy is an importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 曾巨澜郑双好曹忠肖忠良张雄飞朱芙蓉蔺捷朱珍
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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