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Ternary composite preparation method for nanometer sizing phase-change material

A phase change material, ternary composite technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problem of thermal conductivity, thermal stability, insufficient compatibility of building materials, insufficient to achieve composite system performance, optimization and other problems, to achieve the effect of large latent heat capacity, low cost and high energy storage.

Inactive Publication Date: 2011-10-12
SOUTHEAST UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the development of granular phase change materials is mainly based on binary composite materials. Although the performance of organic phase change materials can be improved to a certain extent, it is not enough to optimize the performance of the composite system. and lack of compatibility with building materials

Method used

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preparation example Construction

[0021] A ternary composite preparation method for nano-sized phase change materials, the phase change material is paraffin or fatty acid, expanded graphite is used as the support body and thermal conductivity enhancer of the phase change material at the same time, and clay is used as the support body and inorganic modification of the phase change material at the same time materials, the specific steps are:

[0022] (1) Expansion of graphite: the acidified graphite is expanded in a muffle furnace at 850-950°C for 30-60s to prepare expanded graphite in an expanded state.

[0023] (2) Organic treatment of montmorillonite: carry out organic treatment according to conventional methods, stir bentonite and distilled water to form a suspension evenly, add organic reagent tetradecyl trimethyl ammonium bromide or cetyl trimethyl ammonium bromide Methyl ammonium chloride, and adjust its pH value to 6, then stir at 70°C for 3 hours, filter and dry for later use.

[0024] (3) Preparation ...

Embodiment 1

[0027] Mix 1g of organic montmorillonite prepared according to steps 1 and 2 with 3g of expanded graphite, add it to 500ml of absolute ethanol and disperse evenly, after ultrasonic treatment at 100W power for 6h, add 28g of phase-change substance paraffin and ultrasonically disperse for 1h, condense The absolute ethanol is recovered and dried to obtain a ternary composite phase change material.

Embodiment 2

[0029] Mix 1g of organic montmorillonite prepared according to steps 1 and 2 with 4g of expanded graphite, add it to 500ml of absolute ethanol to disperse evenly, and after ultrasonic treatment at 100W for 6 hours, add 33g of phase-change paraffin and ultrasonically disperse for 1 hour, then condense and recover dehydrated alcohol and dried to obtain a ternary composite phase change material.

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Abstract

The invention discloses a ternary composite preparation method for a nanometer sizing phase-change material; a phase-change material is paraffins or fatty acid; expandable graphite is used as a supporter and a heat conductive reinforcing agent of the phase-change material at the same time; and clay is used as a supporter and an organic modified material of the phase-change material at the same time. The preparation method comprises the following steps of: firstly puffing the graphite and carrying out organic treatment on the montmorillonite; then preparing an organic montmorillonite / graphite binary nanometer composite material as follows: uniformly mixing the organic montmorillonite and the expandable graphite, adding a solvent and carrying out ultrasonic treatment so as to obtain a binary nanometer composite material suspending liquid; finally preparing an organic montmorillonite / graphite / phase-change material ternary nanometer compound phase-change material as follows: adding the phase-change material into the prepared binary nanometer composite material suspending liquid, carrying out ultrasonic dispersing treatment for 1 to 2 hours, heating and condensing the refluxed solvent, and carrying out vacuum drying so as to obtain the ternary nanometer compound phase-change material. The obtained material has the advantages of high heat conductivity, stable phase change and good compatibility with building materials and no corrosion.

Description

technical field [0001] The invention relates to a preparation method of a phase change heat storage material, in particular to a preparation method of a nanoscale heat storage phase change material prepared by organic / inorganic material ternary compounding. Background technique [0002] In my country, buildings have gradually become one of the main energy consumption. Building energy consumption currently accounts for about 25% of the total energy consumption of the national economy, and it is showing an increasing trend. According to tests, about 50% of the total energy consumption of buildings is caused by walls. of. Although the widely used external wall insulation and internal wall insulation technology can reduce energy consumption, due to the limited heat capacity of the material itself, the energy cannot be fully stored and utilized, thus limiting the energy saving capacity of the building. Phase change materials are environmentally friendly and energy-saving intell...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 李敏吴智深考宏涛谭金淼
Owner SOUTHEAST UNIV
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