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Organic phase-change microcapsule with high coating rate, high thermal conductivity and high thermal cycling stability, and preparation method thereof

A technology with cycle stability and high thermal conductivity, which is applied in the direction of microcapsule preparation, microsphere preparation, heat exchange materials, etc., can solve the problems of low coating rate, poor thermal performance, and small latent heat, etc., and achieve simple ingredients and raw materials Ease of purchase and the effect of prolonging the service life

Active Publication Date: 2022-01-04
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the currently prepared phase change microcapsules still generally have low coating ratio, resulting in low latent heat and poor thermal performance.

Method used

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  • Organic phase-change microcapsule with high coating rate, high thermal conductivity and high thermal cycling stability, and preparation method thereof
  • Organic phase-change microcapsule with high coating rate, high thermal conductivity and high thermal cycling stability, and preparation method thereof
  • Organic phase-change microcapsule with high coating rate, high thermal conductivity and high thermal cycling stability, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A preparation method of phase-change microcapsules with high coating rate, high thermal conductivity and high thermal cycle stability, comprising the following steps:

[0045] (1) In a 65°C oil bath, add 10.00 g of dispersant and 100 mL of water into a glass, and stir at a stirring speed of 900 rpm until completely dissolved.

[0046] (2) Weigh 2g of vacuum-dried silicon nitride, disperse it in 300mL of ethyl acetate under ultrasonic conditions, take 0.67g of KH-570 and add it to the ethyl acetate solution system, and the mixed solution is refluxed at 75°C for 3.5h, and the reaction is over Afterwards, the modified nanoparticles are subjected to centrifugation, washing and vacuum drying.

[0047] (3) Accurately weigh 9.33g methyl methacrylate, 4.00gPETRA (pentaerythritol tetraacrylate-crosslinking agent), 0.26g (dilauroyl peroxide) initiator, modified silicon nitride 0.83g and join in In the beaker, the initiator was fully dissolved by ultrasound, and then C was added ...

Embodiment 2

[0055] A preparation method of phase-change microcapsules with high coating rate, high thermal conductivity and high thermal cycle stability, comprising the following steps:

[0056] (1) In a 65°C oil bath, add 8.00 g of dispersant and 100 mL of water into a glass cup, and stir at a stirring speed of 900 rpm until completely dissolved.

[0057] (2) Weigh 2g of vacuum-dried silicon nitride and fully disperse it in 300mL of ethyl acetate under ultrasonic conditions for 5min. Take 0.67g of KH-570 and add it to the ethyl acetate solution system, and the mixed solution is refluxed at 75°C for reaction After 3.5 hours, after the reaction, the modified nanoparticles were centrifuged, washed, and vacuum-dried.

[0058] (3) Accurately weigh 9.33g methyl methacrylate, 3.80gPETRA (pentaerythritol tetraacrylate-crosslinking agent), 0.20g (dilauroyl peroxide) initiator, modified silicon nitride 0.75g and join in In the beaker, the initiator was fully dissolved by ultrasound, and then C wa...

Embodiment 3

[0063] In the present embodiment, a preparation method of phase-change microcapsules with high coating rate, high thermal conductivity and high thermal cycle stability comprises the following steps:

[0064] (1) In a 65°C oil bath, add 12.00g of dispersant and 100mL of water into a glass, and stir at a stirring speed of 900rpm until completely dissolved.

[0065] (2) Weigh 2g of vacuum-dried silicon nitride, disperse it in 300mL of ethyl acetate under ultrasonic conditions, take 0.67g of KH-570 and add it to the ethyl acetate solution system, and the mixed solution is refluxed at 75°C for 3.5h, and the reaction is over Afterwards, the modified nanoparticles are subjected to centrifugation, washing and vacuum drying.

[0066] (3) Accurately weigh 9.33g methyl methacrylate, 4.50gPETRA (pentaerythritol tetraacrylate-crosslinking agent), 0.28g (dilauroyl peroxide) initiator, silicon nitride 0.85g after modification join in In the beaker, the initiator was fully dissolved by ultra...

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Abstract

The invention provides an organic phase-change microcapsule with high coating rate, high thermal conductivity and high thermal cycling stability, and a preparation method thereof, and relates to the field of phase-change microcapsule materials. According to the organic phase-change microcapsule, a dispersant aqueous solution, methyl methacrylate, a cross-linking agent, an initiator, modified silicon nitride and a C14-C25 straight-chain alkane are directly mixed uniformly, and are subjected to reaction polymerization, and by adjusting the reaction conditions and dosage and uniformly grafting the modified silicon nitride on the surface of the organic shell, the heat-conducting property of the organic shell is improved, and finally the purpose of improving the thermal property of the microcapsule is achieved. The heat conductivity of the prepared microcapsule reaches 4.80 W / m.K, the phase change enthalpy value is larger than or equal to 210 J / g, the phase change enthalpy value is larger than or equal to 200 J / g after 500 times of cold and heat cycles, the coating rate is 82.5% or above, and the microcapsule has the effects of being high in latent heat and good in heat cycle stability.

Description

technical field [0001] The invention belongs to the technical field of phase change microcapsules, in particular to an organic phase change microcapsule with high coating rate, high thermal conductivity and high thermal cycle stability and a preparation method thereof. Background technique [0002] With the development of society and economy, human's demand for energy is increasing rapidly, and the control of temperature is also required to be more and more intelligent and precise. At the same time, the problem of energy shortage and scarcity is becoming more and more prominent at the present stage. How to use energy efficiently and economically has become a technical problem that needs to be solved urgently in this field. [0003] Phase change energy storage materials refer to substances that change the state of matter and provide latent heat when the temperature remains unchanged; the process of changing physical properties is called a phase change process. At this time, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C09K5/14B01J13/14B01J13/04
CPCC09K5/063C09K5/14B01J13/14B01J13/043Y02E60/14
Inventor 李金洪路清辛义秀
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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