Phase-change microcapsule based on inorganic shell layer and preparation method and application thereof

A technology of phase-change microcapsules and manufacturing methods, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems that the encapsulation effect and enthalpy retention rate cannot be well considered, and achieve excellent enthalpy value The effect of retention rate, stable performance and excellent packaging effect

Active Publication Date: 2020-09-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the currently disclosed phase-change microcapsules coated with composite wall materials still have certain defects, which mainly focus on not being able to balance the encapsulation effect and enthalpy retention rate well.

Method used

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  • Phase-change microcapsule based on inorganic shell layer and preparation method and application thereof
  • Phase-change microcapsule based on inorganic shell layer and preparation method and application thereof
  • Phase-change microcapsule based on inorganic shell layer and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0105] There is no particular limitation on the preparation method of Janus particles, and Janus particles can be prepared by methods commonly used in the art. For example, it can be prepared by surface selective modification, emulsion polymerization, seed emulsion polymerization, phase separation, microfabrication and self-assembly, dispersion polymerization, etc.

[0106] In some preferred embodiments, the preparation method of Janus particles of the present invention can refer to the preparation method of Janus particles disclosed in Chinese patent application CN105440218A, for example. Specifically, the preparation method of the Janus particles of the present invention comprises the following steps: dispersing the polymer particles in water to obtain a seed solution; emulsifying a silane coupling agent, an emulsifier, an initiator, etc. and adding them to the seed solution; The polymerization reaction is carried out to obtain a suspension of Janus particles; the obtained s...

Embodiment 1

[0182] SiO 2 - Preparation of PS Janus particles

[0183] 0.15 g of azobisisobutyronitrile (AIBN) was dissolved in 15.00 g of divinylbenzene (DVB), and 0.15 g of sodium dodecyl sulfate (SDS) was dissolved in 800.00 g of water. The above two solutions were mixed and ultrasonically emulsified for 3 minutes to obtain DVB monomer emulsion. Then 25.00 g of freeze-dried HP-433 polystyrene (PS) hollow spheres were dispersed into the above-mentioned monomer emulsion. Stir at room temperature for 8 hours to induce DVB to swell PS hollow spheres. Then the temperature was raised to 70° C. and reacted for 12 hours to obtain a cross-linked PS hollow sphere dispersion. Finally, dry powder of seed balls was obtained by washing with ethanol and water and freeze-drying. Disperse 10.00 g of dry powder of seed balls in 200.00 g of water, and raise the temperature of the system to 70°C. Add 6.00g of 3-(methacryloyloxy)propyltrimethoxysilane (MPS), 6.00g of 1wt% potassium persulfate (KPS)...

Embodiment 2

[0190] SiO 2 - Preparation of PS Janus particles

[0191] SiO 2 -PS Janus particles were prepared similarly to Example 1, except that the amount of 3-(methacryloxy)propyltrimethoxysilane (MPS) used was changed to obtain larger silica ends. The specific steps are as follows: 0.15 g of azobisisobutyronitrile (AIBN) was dissolved in 15.00 g of divinylbenzene (DVB), and 0.15 g of sodium dodecyl sulfate (SDS) was dissolved in 800.00 g of water. The above two solutions were mixed and ultrasonically emulsified for 3 minutes to obtain DVB monomer emulsion. Then 25.00 g of freeze-dried HP-433 polystyrene (PS) hollow spheres were dispersed into the above-mentioned monomer emulsion. Stir at room temperature for 8 hours to induce DVB to swell PS hollow spheres. Then the temperature was raised to 70° C. and reacted for 12 hours to obtain a cross-linked PS hollow sphere dispersion. Finally, dry powder of seed balls was obtained by washing with ethanol and water and freeze-drying. ...

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Abstract

The invention provides a phase-change microcapsule based on an inorganic shell layer and a preparation method and application thereof. The Janus particle-containing composite wall material-coated phase change microcapsule based on the inorganic shell layer is obtained by stabilizing an emulsion through Janus particles and utilizing a sol-gel reaction at a water-oil interface. The phase change microcapsule based on the inorganic shell layer has controllable phase change temperature and high enthalpy retention rate, and the supercooling degree of a solid-liquid phase change material is effectively reduced. The phase-change microcapsule based on the inorganic shell layer is low in breakage rate in the using process, free of leakage of phase-change materials and volatile gas, excellent in using stability, safe and environmentally friendly. In addition, the phase change microcapsule coated with the composite wall material can be prepared in a green manner, and no toxic volatile substance isgenerated in the preparation process. The phase change microcapsule is simple in process and short in production period, and has a prospect of industrial batch production.

Description

technical field [0001] The invention relates to a phase-change microcapsule based on an inorganic shell and its manufacturing method and application, in particular to an inorganic shell-based microcapsule with controllable phase transition temperature, high heat storage density and high enthalpy retention rate. Phase-change microcapsules and their manufacturing methods and applications. Background technique [0002] The microencapsulation of phase change materials is considered to be one of the most important technical means to solve major defects such as leakage and deformation of solid-liquid phase change materials. Because the particles of phase change microcapsules are small, the specific surface area is large, the latent heat of phase change is large, and the particles can collide with each other to exchange heat, they are widely used in solar energy industry, industrial waste heat and waste heat recovery, air conditioning energy saving, building heating and other field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/02
CPCB01J13/02C09K5/06
Inventor 杨振忠梁福鑫桂豪冠
Owner TSINGHUA UNIV
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