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A shape-fixed phase-change material for passive thermal protection and its preparation method

A technology of shape-setting phase change and heat storage materials, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of liquid state and material encapsulation, etc., and achieves the advantages of simple preparation method, expanded application range and high latent heat of phase change. Effect

Inactive Publication Date: 2017-11-10
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another problem with solid-liquid phase change heat storage materials is that there is a liquid state during use, so the problem of material packaging must be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Preparation of suspension: Take 0.204g of silver nanowires, mix them with 40mL of absolute ethanol in a round bottom flask, and ultrasonicate for 30 minutes to obtain a silver nanowire / absolute ethanol mixture; add 2.0g of erythrose to the above mixture Alcohol, 0.7g polyethylene glycol 10000 and 60mL absolute ethanol, put them in a water bath at 75°C, reflux and stir to completely dissolve erythrose and polyethylene glycol, stop heating, stir vigorously, let the system cool down to the greenhouse to obtain stabilize the suspension.

[0019] 2) Cooling of the suspension: Add 0.51 g of aniline and 1.72 g of p-toluenesulfonic acid to the suspension and mix well, then transfer the mixture into an ice-water bath, stir vigorously and lower the temperature of the mixture to 5-10°C .

[0020] 3) Aniline polymerization: 2.658 g of benzoyl peroxide was added to the above mixture at 5-10°C to initiate the polymerization of aniline, and the mixture was allowed to heat up natur...

Embodiment 2

[0025] 1) Preparation of suspension: Take 1.67g of silver nanowires, mix them with 40mL of absolute ethanol in a round bottom flask, and ultrasonicate for 60 minutes to obtain a silver nanowire / absolute ethanol mixture; add 2.0g of erythrose to the above mixture Alcohol, 0.7g polyethylene glycol 10000 and 60mL absolute ethanol, put them in a water bath at 75°C, reflux and stir to completely dissolve erythrose and polyethylene glycol, stop heating, stir vigorously, let the system cool down to the greenhouse to obtain stabilize the suspension.

[0026] 2) Cooling of the suspension: Add 0.51 g of aniline and 1.72 g of p-toluenesulfonic acid to the suspension and mix well, then transfer the mixture into an ice-water bath, stir vigorously and lower the temperature of the mixture to 5-10°C .

[0027] 3) Aniline polymerization: 3.315 g of benzoyl peroxide was added to the above mixture at 5-10°C to initiate the polymerization of aniline, and the mixture was allowed to heat up natura...

Embodiment 3

[0032] 1) Preparation of suspension: Take 0.124g of silver nanowires, mix them with 40mL of absolute ethanol in a round bottom flask, and ultrasonicate for 20 minutes to obtain a silver nanowire / absolute ethanol mixture; add 2.0g of erythrose to the above mixture Alcohol, 1g polyethylene glycol 10000 and 40mL absolute ethanol, put in a water bath at 70°C, reflux and stir to completely dissolve erythrose and polyethylene glycol, stop heating, stir vigorously, let the system cool down to the greenhouse to stabilize suspension.

[0033] 2) Cooling of the suspension: add 0.35 g of aniline and 0.94 g of p-toluenesulfonic acid to the suspension and mix well, then transfer the mixture into a cold water bath, stir vigorously and lower the temperature of the mixture to 10-20°C .

[0034] 3) Aniline polymerization: 3.185 g of benzoyl peroxide was added to the above mixture at 10-20°C to initiate the polymerization of aniline, and the mixture was allowed to heat up naturally for 24 hour...

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Abstract

The invention discloses a middle-temperature composite shape-stabilized phase change heat storage material that can be applied to passive thermal protection. Metal nano wires are taken as the thermal conductive filling material, and sugar alcohol is taken as the phase change heat storage material. The preparation method comprises the following steps: at first, metal nano wires and sugar alcohol are dispersed into anhydrous ethanol to form a stable suspension liquid under the actions of a supersonic treatment and a surfactant, then adding aniline and an organic acid, evenly mixing, then adding an oxidant to make aniline carry out polymerization reactions, wherein the generated polyaniline settles on the surface of sugar alcohol / metal nano wire particles, and separating and purifying the reaction products to obtain the composite shape-stabilized phase change heat storage material. The prepared composite shape-stabilized phase change heat storage material has the advantages of simple technology, low cost, high phase change potential heat, moderate thermal conductive performance, and no need for encapsulation, the performance of sugar alcohol phase change heat storage materials is effectively improved, and the application range is enlarged.

Description

technical field [0001] The invention relates to the preparation of a composite shape-changing heat storage material, specifically a metal nanowire doped with a very high latent heat of phase change, and when the temperature is lower than or higher than its phase change temperature, it is solid and has a shape of A stable medium-temperature composite phase-change heat storage material and a preparation method thereof. The material has moderate thermal conductivity and can be used as a heat storage material for a passive thermal protection system. Background technique [0002] Phase change heat storage material is a kind of material that absorbs or releases a large amount of heat energy through the phase transition of the material, and the temperature of the material itself does not change or changes little. The application of phase change heat storage materials can be divided into two categories: one is to store heat energy to achieve efficient energy utilization; the other i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 曾巨澜陈宇航郑双好周磊张雄飞喻林萍曹忠
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY