High thermal conductivity composite phase change microcapsule and preparation method thereof

A composite phase transition, high thermal conductivity technology, applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of particle agglomeration, complex preparation technology, etc. simple effect

Active Publication Date: 2017-02-01
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the existing preparation technology is relatively complicated, and the particle agglomeration and precise positioning caused by the high performance of nanoparticles are problems that need to be further solved

Method used

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  • High thermal conductivity composite phase change microcapsule and preparation method thereof
  • High thermal conductivity composite phase change microcapsule and preparation method thereof
  • High thermal conductivity composite phase change microcapsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: A kind of high thermal conductivity composite phase change microcapsule

[0025] (1) 2g nano-Al 2 o 3 The powder is ultrasonically dispersed in ethanol, and 5% silane coupling agent KH-570 is dissolved in Al 2 o 3 In the dispersion liquid, heat up to 70°C and reflux for more than 8 hours. After centrifugal washing, vacuum drying at 40°C for more than 12 hours to obtain KH-570 modified nano-Al 2 o 3 particles.

[0026] (2) 0.4g modified Al 2 o 3 Ultrasonic dispersion of nanoparticles in 100g of distilled water, adding an appropriate amount of water-soluble initiator ammonium persulfate 0.05g and a small amount of CaCl 2 0.3g; 5g 52°C paraffin wax is heated to 60°C and mixed with 2g styrene, 1.5g butyl acrylate, 0.5g divinylbenzene solution, and 0.04g azobisisobutyronitrile is dissolved in the monomer solution to form a compound Oil phase: After mixing the water phase and the oil phase, emulsify at a high speed of 10,000r / min for 5 minutes to form a...

Embodiment 2

[0027] Embodiment 2: A kind of high thermal conductivity composite phase change microcapsule

[0028] (1) 2g nano-Al 2 o 3 The powder is ultrasonically dispersed in ethanol, and 5% silane coupling agent KH-570 is dissolved in Al 2 o 3 In the dispersion liquid, heat up to 70°C and reflux for more than 8 hours. After centrifugal washing, vacuum drying at 40°C for more than 12 hours to obtain KH-570 modified nano-Al 2 o 3 particles.

[0029] (2) 0.75g modified Al 2 o 3Ultrasonic dispersion of nanoparticles in 100g of distilled water, adding an appropriate amount of water-soluble initiator ammonium persulfate 0.05g and a small amount of CaCl 2 0.2g; heat 7.5g of 52℃ paraffin wax to 60℃ and mix with 4.5g of styrene, 1.5g of butyl acrylate and 1.5g of divinylbenzene solution, and dissolve 0.15g of azobisisobutyronitrile in the monomer solution A composite oil phase is formed; the water phase and the oil phase are mixed and emulsified at a high speed of 10,000 r / min to form ...

Embodiment 3

[0030] Embodiment 3: A kind of high thermal conductivity composite phase change microcapsule

[0031] (1) 2g nano-Al 2 o 3 The powder is ultrasonically dispersed in ethanol, and 5% silane coupling agent KH-570 is dissolved in Al 2 o 3 In the dispersion liquid, heat up to 70°C and reflux for more than 8 hours. After centrifugal washing, vacuum drying at 40°C for more than 12 hours to obtain KH-570 modified nano-Al 2 o 3 particles.

[0032] (2) 0.2g modified Al 2 o 3 Nanoparticles are ultrasonically dispersed in 100g distilled water, and an appropriate amount of water-soluble initiator ammonium persulfate 0.01g and a small amount of CaCl are added 2 0.1g; 5g of 52°C paraffin wax is heated to 60°C and mixed with 4.5g of styrene, 1.5g of butyl acrylate, and 1.5g of divinylbenzene solution, and 0.075g of azobisisobutyronitrile is dissolved in the monomer solution to form Composite oil phase: After mixing the water phase and the oil phase, emulsify at a high speed of 10,000...

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Abstract

The invention discloses a high thermal conductivity composite phase change microcapsule and a preparation method thereof. According to the present invention, paraffin stabilized by adopting nanoparticle as the emulsifier and a monomer form an emulsion and polymerization is performed to form the phase change microcapsule adopting the nanoparticles / polymer as the wall material and adopting the paraffin as the core material, wherein the water phase of the emulsion comprises distilled water, modified nanoparticles, an electrolyte and a water-soluble initiator, and the oil phase comprises paraffin, a monomer, a cross-linking monomer and an oil-soluble initiator; the Pickering emulsion preparation technology is used to embed the nanoparticles in the polymer wall layer and arrange densely, such that the effective heat conduction area is large, the thermal conductivity is greatly improved, and the environmental temperature can be effectively regulated; and the phase change microcapsule preparation process is simple, and has characteristics of no volatile organic solvent addition during the preparation process and the treatment process, green environmental protection, no toxicity, good theoretical significance, and good practical value.

Description

technical field [0001] The invention relates to a nano-particle-modified phase-change microcapsule with high thermal conductivity and a preparation method thereof, which can be applied to building enclosure structures and thermal insulation pipelines, and belongs to the technical field of green energy-saving building materials. Background technique [0002] Phase change materials are a class of substances that use latent heat of phase change to realize energy storage and utilization. The characteristics of adjusting the ambient temperature through their own phase change make them very active in the development and research of energy utilization and materials science. The use of phase change materials in building envelopes and transmission pipelines can alleviate the contradiction between energy supply and demand time and space intensity mismatch, and has important social benefits and application value for solving today's energy shortage and making full use of natural energy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C08F212/08C08F220/18C08F212/36C08F2/24B01J13/14
Inventor 李婧刘洪丽李亚静李洪彦杨久俊白小英
Owner TIANJIN CHENGJIAN UNIV
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