Phase change microcapsule as well as preparation and application thereof

A phase change microcapsule and core material technology, applied in the field of phase change microcapsules, preparation and application, can solve the problems of complex operation of low melting point metal dispersion technology, limited energy storage density of phase change materials, poor dispersion uniformity, etc. Thermal conductivity and mechanical strength, good thermal conductivity, unbreakable effect

Active Publication Date: 2022-07-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to provide a kind of phase change microcapsule and its application, to solve the problem that phase change materials still have limited energy storage density, low thermal conductivity and phase change The problem of easy leakage in the process
[0005]Another object of the present invention is to provide a preparation method of phase-change microcapsules, which solves the problems of complex operation, poor dispersion uniformity and low dispersion efficiency of the existing low-melting point metal dispersion technology. low problem

Method used

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  • Phase change microcapsule as well as preparation and application thereof
  • Phase change microcapsule as well as preparation and application thereof
  • Phase change microcapsule as well as preparation and application thereof

Examples

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Embodiment 1

[0029] 1 g of sodium dodecyl sulfate was weighed and dissolved in a mixed solution of 45 mL of deionized water and 30 mL of absolute ethanol, heated in a water bath at 35°C, and magnetically stirred at 500 rpm for 30 minutes to obtain a dispersant solution. Weigh 10 g of metal gallium in a beaker, and heat gallium to a molten state at a temperature higher than the melting point of gallium. The dispersant solution prepared above was poured into a beaker containing molten gallium, and sheared at 5000 rpm for 5 min. After shearing, it was transferred to an ultrasonic cell pulverizer and sonicated for 3 min to obtain a stable gallium microsphere suspension. Transfer the suspension to a three-necked round-bottomed flask equipped with a polytetrafluoroethylene stirring rod, add 10 g of methyltriethoxysilane, set the rotation speed to 500 rpm and stir for 30 minutes, then add hydrochloric acid to adjust the pH to 2 to 3, and continue stirring. Reaction 6h. After the reaction, the pr...

Embodiment 2

[0032] Accurately weigh 1 g of sodium dodecyl sulfate and dissolve it in a mixed solution of 45 mL of deionized water and 30 mL of absolute ethanol, heat in a water bath at 35°C, and magnetically stir at 500 rpm for 30 minutes to obtain a dispersant solution. Weigh 10 g of metal gallium in a beaker, and heat gallium to a molten state at a temperature higher than the melting point of gallium. The dispersant solution prepared above was poured into a beaker containing molten gallium, and sheared at 5000 rpm for 5 min. After shearing, it was transferred to an ultrasonic cell pulverizer for 8 min to obtain a stable gallium microsphere suspension. Transfer the suspension to a three-necked round-bottomed flask equipped with a polytetrafluoroethylene stirring rod, add 12 g of methyltriethoxysilane, set the rotation speed to 500 rpm and stir for 30 minutes, then add hydrochloric acid to adjust the pH to 2-3, and continue stirring. The reaction was carried out for 6 hours. After the re...

Embodiment 3

[0034] Accurately weigh 1.2 g of cetyl trimethyl ammonium bromide, dissolve it in a mixed solution of 45 mL of deionized water and 30 mL of absolute ethanol, heat in a water bath at 35°C, and magnetically stir at 500 rpm for 30 minutes to obtain a dispersant solution. Weigh 10 g of metal gallium in a beaker, and heat gallium to a molten state at a temperature higher than the melting point of gallium. Pour the above prepared dispersant solution into a beaker containing molten gallium, and shear at 8000 rpm for 5 min. After shearing, transfer it to an ultrasonic cell pulverizer for 3 min to obtain a stable gallium microsphere suspension. Transfer the suspension to a three-necked round-bottomed flask equipped with a polytetrafluoroethylene stirring rod, add 10 g of ethyl orthosilicate, set the rotation speed to 500 rpm and stir for 30 minutes, then add ammonia water to adjust the pH to 9-10, and continue stirring for 16 hours. . After the reaction, the product solution was filte...

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Abstract

The invention discloses a phase change microcapsule, preparation and application, the phase change microcapsule is a spherical particle composed of a core material and a shell layer coating the core material, the inorganic shell layer is silicon dioxide, and the metal core material is gallium. The preparation method comprises the following steps: adding molten metal into a solution containing a surfactant, and obtaining a stable metal microsphere suspension under the synergistic effect of high-speed stirring and intense ultrasound; and transferring the suspension into a three-neck flask, adding a silicon dioxide precursor, adjusting the pH value, and stirring for reaction to obtain the silicon dioxide coated gallium phase change microcapsule. The phase change microcapsule prepared by the method has the advantages of controllable particle size, large energy storage density, strong thermal conductivity, good mechanical property and the like, has good compatibility with building materials, and can be used for regulating and controlling the hydration heat release rate and heat release amount of cement.

Description

technical field [0001] The invention relates to a phase change material and preparation, in particular to a phase change microcapsule, preparation and application. Background technique [0002] As a traditional building material, concrete has been used for nearly two hundred years. It is the engineering material with the largest amount and the widest application space in contemporary production and construction. Concrete is a poor conductor of heat. In the initial stage of pouring, a large amount of heat generated by cement hydration causes the internal temperature to rise sharply, resulting in an excessive temperature difference between the interior and the surface. Due to the constraints of the external environment, foundation, and pouring structure boundaries, the concrete matrix cannot freely expand and contract. deformation, resulting in temperature cracks on the surface, threatening the life and safety of the building. [0003] Phase change materials have good thermop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B20/10
CPCC04B40/0039C04B20/1062C04B24/16C04B24/026C04B22/04C04B22/122C04B24/42C04B14/062C04B24/005Y02E60/14
Inventor 蒋金洋琚思懿王立国王凤娟辛忠毅
Owner SOUTHEAST UNIV
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