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Phase-change microcapsules based on polymer shell and manufacturing method thereof

A technology of phase change microcapsules and a manufacturing method, which is applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of limited application of phase change materials, poor encapsulation effect, low thermal conductivity, etc., and can meet environmental requirements. The effect of friendly demand, convenient operation and high conversion rate of raw materials

Active Publication Date: 2021-11-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although organic wall materials such as polyurethane, melamine-modified urea-formaldehyde resin, and melamine-formaldehyde resin have better encapsulation effects, the thermal conductivity is low, and a large amount of volatile organic compounds ( For example, formaldehyde), which greatly limits the application of phase change materials
What's more, most organic wall materials are combustible, which has many safety hazards
In addition, although most inorganic wall materials have certain advantages such as flame retardancy, relatively constant phase transition temperature, and high energy storage density, their packaging effect is poor and the wall materials are brittle, which limits the application of inorganic wall materials.

Method used

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  • Phase-change microcapsules based on polymer shell and manufacturing method thereof
  • Phase-change microcapsules based on polymer shell and manufacturing method thereof
  • Phase-change microcapsules based on polymer shell and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0108] 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.

[0109] 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

[0186] SiO 2 - Preparation of PS Janus particles

[0187] 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

[0195] SiO 2 - Preparation of PS Janus particles

[0196] 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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PUM

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Abstract

The invention provides a polymer shell-based phase-change microcapsule and a manufacturing method thereof. The polymer shell-based phase-change microcapsule of the present invention comprises: a phase-change core material, and a composite wall material covering the phase-change core material, wherein the composite wall material consists of Janus particles and a shell polymer The wall material composition is formed. The polymer shell-based phase change microcapsule of the present invention has a controllable phase change temperature, high heat storage density and high enthalpy retention rate. The manufacturing method of the phase-change microcapsules based on the polymer shell of the present invention can freely regulate the phase-change temperature of the phase-change material, efficiently control the ratio of the phase-change material and Janus particles, and has simple process, short production cycle, and industrial batch production prospects.

Description

technical field [0001] The invention relates to a phase change microcapsule based on a polymer shell and a manufacturing method thereof, in particular to a high enthalpy phase change microcapsule with controllable phase change temperature, high heat storage density and high enthalpy retention rate and its method of manufacture. Background technique [0002] The increasing energy consumption requires people to be able to produce, store and utilize energy more efficiently. As one of the earliest energy sources used by human beings, the waste of heat energy is a phenomenon that cannot be ignored. Saving heat energy and improving the efficiency of heat energy use are urgent technical challenges. Using phase change latent heat of phase change materials to store energy (cold storage, heat storage) is a new type of environmental protection and energy saving technology, which has the advantages of small temperature change and high heat storage density, making it widely used in sola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02C09K5/06C08F212/08C08F212/36C08F220/18C08F222/14C08F2/48
CPCB01J13/02C08F2/48C08F212/08C09K5/063C08F220/1804C08F212/36C08F222/102
Inventor 杨振忠梁福鑫桂豪冠
Owner TSINGHUA UNIV