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Double-temperature-zone phase change material and preparation method thereof

A phase change material, dual temperature zone technology, applied in microsphere preparation, heat exchange materials, chemical instruments and methods, etc., can solve the problem of easy leakage of solid-liquid phase change materials, and achieve the protection of The method is simple and the effect is not easy to break

Active Publication Date: 2020-11-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a dual temperature zone phase change material and its preparation method, which solves the problem of easy leakage of solid-liquid phase change materials

Method used

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  • Double-temperature-zone phase change material and preparation method thereof
  • Double-temperature-zone phase change material and preparation method thereof
  • Double-temperature-zone phase change material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) carry out surface modification to pentadecane with silane coupling agent, concrete steps are as follows:

[0046] Weigh 80g of absolute ethanol and 20g of water and mix them; add phosphoric acid (concentration: 30wt%) to adjust the pH to about 5; add 10g of vinyl tris(2-methoxyethoxy)silane, stir for 3h; let stand for 6h, Completely hydrolyze vinyl tris(2-methoxyethoxy)silane; weigh 10 g of pentadecane and 15 g of the above liquid, mix and stir at 300 rpm for 1 h to obtain modified pentadecane.

[0047] (2) Weigh 70g PEGDA, add 30ml water to configure the solution, and based on the above solution, add 10wt% silicon dioxide, 0.3wt% PVA, 0.25wt% SDS and 2wt% 2-hydroxyl-4'-(2-hydroxyl Ethoxy)-2-methylpropiophenone, ultrasonic 30min. ;

[0048] (3) Add phosphoric acid (concentration is 30wt%) to step (2) gained dispersion liquid, adjust dispersion liquid pH to about 5;

[0049] (4) mixing the dispersion liquid obtained in step (3) with the modified pentadecane obtain...

Embodiment 2

[0055] (1) Carry out surface modification to hexadecane with silane coupling agent, modification method is the same as embodiment 1.

[0056] (2) Weigh 70g of PEGDA, add 30ml of water to configure the solution, and based on the above solution, add 12wt% titanium dioxide, 0.3wt% PVA, 0.3wt% SDS and 2wt% 2-hydroxy-4'-(2-hydroxyethoxy )-2-methylpropiophenone, ultrasonic 30min. ;

[0057] (3) Add phosphoric acid (concentration is 30wt%) to step (2) gained dispersion liquid, adjust dispersion liquid pH to about 5;

[0058] (4) Mix the dispersion obtained in step (3) with the modified hexadecane obtained in step (1), ultrasonicate for 1 hour, and cure for 3 hours under 365nm ultraviolet light;

[0059] (5) Centrifuge the dispersion obtained in step (4) at a speed of 10,000 rpm, and then dry it in vacuum at 20°C for 10 hours to obtain hexadecane@TiO 2 @hydrogel dual temperature zone phase change material.

[0060] image 3 Hexadecane@TiO provided for this example 2 Microscopic ...

Embodiment 3

[0064] (1) Heptadecane is surface-modified with a silane coupling agent, and the modification method is the same as in Example 1.

[0065] (2) Weigh 70g of PEGDA, add 30ml of water to configure the solution, and based on the above solution, add 14wt% zinc oxide, 0.3wt% PVA, 0.5wt% F108 and 2wt% 2-hydroxyl-4'-(2-hydroxyethoxy base)-2-methylpropiophenone, ultrasonic 30min. ;

[0066] (3) Add phosphoric acid (concentration is 30wt%) to step (2) gained dispersion liquid, adjust dispersion liquid pH to about 5;

[0067] (4) mixing the dispersion liquid obtained in step (3) with the modified heptadecane obtained in step (1), ultrasonicating for 1 h, and curing under 365 nm ultraviolet light for 3 h;

[0068] (5) Centrifuge the dispersion liquid obtained in step (4) at a speed of 10000 rpm, and then vacuum-dry it at 23°C for 10 hours to prepare a heptadecane@ZnO@hydrogel phase change material with dual temperature zones.

[0069] Figure 4 Microscopic images of the heptadecane@Zn...

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Abstract

The invention relates to the technical field of phase change materials, in particular to a double-temperature-zone phase change material and a preparation method thereof. The invention discloses a double-temperature-zone phase-change material. The double-temperature-zone phase-change material is of a core-shell structure; a core layer of the core-shell structure is an organic phase change material, and a shell layer of the core-shell structure is hydrogel containing hydrophilic nanoparticles. According to the invention, the phase-change material is wrapped by the hydrogel, so that the phase-change material is encapsulated, and water in the phase-change material and the hydrogel can play a role in protecting the phase-change material. Moreover, the cross-linking effect of the hydrogel is enhanced by utilizing the hydrophilic nanoparticles, so that the mechanical strength of the hydrogel is improved, the hydrogel is not easy to break, and a better protection effect is provided for the phase-change material. Besides, the water in the shell layer of the double-temperature-zone phase change material and the organic phase change material in the core layer have different phase change temperatures, so that the phase change material has the characteristics of double temperature zones and can be applied to different environments.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a dual temperature zone phase change material and a preparation method thereof. Background technique [0002] Phase change materials (PCMs) are energy materials that absorb or release latent heat to the outside by undergoing a phase change at a certain temperature, thereby achieving the purpose of temperature regulation. Solid-liquid phase change materials are currently the most promising phase change materials due to their large latent heat of phase change. However, the phase change material is prone to leakage and environmental pollution when it is in a liquid state, and the phase change material is easily affected by factors such as water and light in the external environment when exposed to the outside world, which limits the application of this type of material. Contents of the invention [0003] The invention provides a phase change material with dual temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/14
CPCB01J13/14C09K5/063
Inventor 林鹏程陈虹滨盛鑫鑫陈颖
Owner GUANGDONG UNIV OF TECH