High-light-absorption high-heat-conductivity fatty acid/nano complex modified vermiculite composite phase-change energy storage material and preparation method thereof

A nano-composite and composite phase change technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of low latent heat of phase change, low thermal conductivity, poor light-to-heat conversion ability, etc., and achieve high thermal conductivity and The effect of phase change enthalpy, increasing specific surface area, and improving pore structure

Active Publication Date: 2019-08-23
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a fatty acid / nano-composite modified vermiculite composite phase change energy storage material with high light absorption and high thermal conductivity and its preparation method, which aims at the low latent heat of phase change of the existing phase change energy storage materials and low light-heat The defects of poor conversion ability and low thermal conductivity provide a way to load nano-TiO 2 -TiC-C or SiO 2 -SiC-C nanocomposite modified vermiculite is a new type of highly light-absorbing, high thermal conductivity fatty acid / nanocomposite modified vermiculite composite phase change energy storage material, and the thermal conductivity and latent heat of phase change of the material are obtained. In particular, its phase transition temperature can be adjusted and controlled within a certain range by the type and mass ratio of fatty acids. Therefore, this material has good application value in the fields of thermal energy storage and solar energy conversion, further broadening the scope of this composite phase transition storage. Applications of energy materials

Method used

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  • High-light-absorption high-heat-conductivity fatty acid/nano complex modified vermiculite composite phase-change energy storage material and preparation method thereof
  • High-light-absorption high-heat-conductivity fatty acid/nano complex modified vermiculite composite phase-change energy storage material and preparation method thereof
  • High-light-absorption high-heat-conductivity fatty acid/nano complex modified vermiculite composite phase-change energy storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Weigh 15g of myristic acid and place it in a beaker, then put it into a constant temperature water bath at 90°C, heat and stir for 10 minutes, ultrasonicate for 3 minutes, take it out and cool to room temperature; the melting point of myristic acid is 54.6°C determined by differential scanning calorimetry , the freezing point is 51.8°C, and the latent heat of phase change is 189.4J / g.

[0035] (2) After making a solution of 3g of sucrose, 15mL of water and 1mL of glacial acetic acid, add 5g of expanded vermiculite, stir at room temperature for 20min, then ultrasonicate for 3min to form a uniformly dispersed solution system, and then add 1.5mL of orthosilicate The mixed solution of ethyl ester and 1.5mL absolute ethanol, after the dropwise addition, the temperature was raised to 60°C and continued to stir for 2h, then the solution was poured into a hydrothermal kettle, reacted at 180°C for 12h, then placed in a 70°C oven to dry and After grinding, the obtained precur...

Embodiment 2

[0038] (1) Mix lauric acid, myristic acid, and stearic acid evenly in a mass ratio of 60.7: 29.9: 9.4, heat and stir in a constant temperature water bath at 80°C for 20 minutes, take it out and cool to room temperature after ultrasonication for 2 minutes; The melting point of the lauric acid / myristic acid / stearic acid ternary eutectic mixture determined by thermal method is 31.0°C, the freezing point is 27.6°C, and the latent heat of phase transition is 164.0J / g.

[0039] (2) Measure 1.42mL of tetrabutyl titanate, add 12.78mL of absolute ethanol, stir magnetically for 15min, add 0.48mL of glacial acetic acid, stir vigorously for 15min, then add 5g of expanded vermiculite (EV), stir for 1h, and ultrasonically After shaking for 30 minutes, continue to stir, then add dropwise a mixture of 3mL absolute ethanol and 0.3mL distilled water at a rate of about 1 drop / 5s, adjust the pH of the solution to about 1~2 with 0.01mL nitric acid, and stir vigorously at room temperature for 2 hour...

Embodiment 3

[0043] (1) Mix lauric acid, myristic acid, and stearic acid evenly in a mass ratio of 60.7: 29.9: 9.4, heat and stir in a constant temperature water bath at 80°C for 30 minutes, take it out and cool to room temperature after ultrasonication for 2 minutes; The melting point of the lauric acid / myristic acid / stearic acid ternary eutectic mixture determined by thermal method is 31.0°C, the freezing point is 27.6°C, and the latent heat of phase transition is 164.0J / g.

[0044] (2) After making a solution of 3g of sucrose, 15mL of water and 1mL of ammonia water, add 5g of expanded vermiculite, stir at room temperature for 20min, then sonicate for 3min to form a uniformly dispersed solution system, and then add 1.5mL of tetraethyl orthosilicate dropwise Mixed solution of ester and 1.5mL of absolute ethanol, after the dropwise addition, raise the temperature to 60°C and continue to stir for 2h, then pour the solution into a hydrothermal kettle, react at 180°C for 11h, then dry and grin...

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Abstract

The invention discloses a high-light-absorption high-heat-conductivity fatty acid / nano complex modified vermiculite composite phase-change energy storage material and a preparation method thereof. Thepreparation method comprises the following steps: by taking modified vermiculite with a TiO2-TiC-C or SiO2-SiC-C nano complex as a supporting substrate, adding a molten unitary fatty acid or multielement fatty acid eutectic mixture, and implementing a vacuum soaking and adsorption method, thereby obtaining the high-light-absorption high-heat-conductivity fatty acid / nano complex modified vermiculite composite phase-change energy storage material. By adopting the preparation method disclosed by the invention, the problem that a conventional phase-change energy storage material is low in phase-change enthalpy value and low in heat conduction coefficient can be solved, the prepared composite phase-change energy storage material is capable of achieving light-heat conversion rapidly under radiation of sunshine and can be used as a heat source, the phase-change temperature of the material can be adjusted and controlled through types and mass ratios of fatty acids, and thus the material has good application values in fields such as heat energy storage and solar energy conversion.

Description

technical field [0001] The invention belongs to the technical field of energy-saving energy storage materials, and in particular relates to a fatty acid / nano-composite modified vermiculite composite phase-change energy storage material with high light absorption and high thermal conductivity and a preparation method thereof. Background technique [0002] So far, measures to develop new energy sources cannot meet the energy demands of development. To solve the problem of energy shortage, in addition to seeking new energy development, we should also improve the utilization efficiency of existing energy, change the structure of energy use, and reduce unnecessary energy loss. Efficient thermal energy storage is one of the ways to realize this idea. one. A variety of new building materials have emerged, including phase change energy storage materials. Many heating and cooling applications are developing rapidly thanks to the thermal energy storage properties of phase change mat...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李湘祁张嘉胜王宗明吴茜
Owner FUZHOU UNIVERSITY
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