Preparation method of high-thermal-conductivity super-hydrophobic phase change microcapsule

A phase-change microcapsule and superhydrophobic technology, applied in microcapsule preparations, microsphere preparation, heat exchange materials, etc., can solve the problems that cannot be used in applications, the hydrophobic effect is not obvious enough, and the size difference is not obvious enough, etc. The effect of reducing surface energy, improving thermal conductivity, and improving compatibility

Pending Publication Date: 2021-11-09
武汉中科先进材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent application CN104927779 B prepared a phase-change microcapsule with a shell material with a micro-nano structure, the average particle size of the microcapsule is 10-1000 μm, and the average particle size of the outer surface of the capsule shell is 150-650 nm. The roughness achieves super-hydrophobic effect. This structure can achieve super-hydrophobicity for large-diameter microcapsules. For small-diameter microcapsules, the difference between the size of microcapsules and nanoparticles is not obvious enough, and the hydrophobic effect is not obvious enough, so it cannot For applications requiring small size phase change microcapsules

Method used

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  • Preparation method of high-thermal-conductivity super-hydrophobic phase change microcapsule
  • Preparation method of high-thermal-conductivity super-hydrophobic phase change microcapsule
  • Preparation method of high-thermal-conductivity super-hydrophobic phase change microcapsule

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Experimental program
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Effect test

Embodiment 1

[0030] 1) Preparation of modified inorganic nanoparticles: 5g of silane coupling agent γ-aminopropyltriethoxysilane (KH550) was dissolved in ethanol, configured into a solution with a mass fraction of 10%, and then added to 4g of nano-alumina In a mixed system with 20ml of ethanol, ultrasonically vibrate for 20min, continue stirring at room temperature for 3h, and finally filter the product and wash it several times with deionized water, then vacuum dry to obtain a white powder;

[0031] 2) Preparation of phase-change core material emulsion: Mix 100 g of styrene-maleic anhydride copolymer (SMA) with a solid content of 10% and 1 g of perfluorohexyl polyoxyethylene ether, add citric acid to adjust to PH=4.8, and heat up To 50°C, heat 80g of octadecane to make it melt into a liquid state, add it to the emulsifier, and disperse at high speed for 20 minutes to obtain a phase-change core material emulsion;

[0032] 3) Preparation of phase-change microcapsule emulsion: Add 2g of modi...

Embodiment 2

[0034]1) Preparation of modified inorganic nanoparticles: 4g of silane coupling agent 3-aminopropyltrimethoxysilane (KH551) was dissolved in ethanol, configured into a solution with a mass fraction of 5%, and then added to 4g of nano-aluminum nitride In a mixed system with 20ml of ethanol, ultrasonically vibrate for 40min, continue stirring at room temperature for 4h, and finally filter the product and wash it several times with deionized water, then vacuum dry to obtain a white powder;

[0035] 2) Preparation of phase-change core material emulsion: Mix 100 g of styrene-maleic anhydride copolymer (SMA) with a solid content of 10% and 2 g of perfluorooctyl polyoxyethylene ether, add acetic acid to adjust PH=6, and heat up to At 70°C, heat 80g of eicosane to make it melt into a liquid state, add it to the emulsifier, and disperse at high speed for 10 minutes to obtain a phase-change core material emulsion;

[0036] 3) Preparation of phase-change microcapsule emulsion: Add 3 g of...

Embodiment 3

[0038] 1) Preparation of modified inorganic nanoparticles: 4g of silane coupling agent 3-aminopropyltrimethoxysilane (KH551) was dissolved in ethanol, configured into a solution with a mass fraction of 2%, and then added to 4g of nano-silicon nitride In a mixed system with 20ml of ethanol, ultrasonically vibrate for 60min, continue stirring at room temperature for 2h, and finally filter the product and wash it several times with deionized water, then vacuum dry to obtain a white powder;

[0039] 2) Preparation of phase change core material emulsion: mix 100g of styrene-maleic anhydride copolymer (SMA) with a solid content of 10% and 3g of sodium perfluorononenyloxybenzenesulfonate evenly, add citric acid to adjust to PH= 4.8, heat up to 60°C, heat 80g of octadecane to make it melt into a liquid state, add it to the emulsifier, and disperse at high speed for 30 minutes to obtain a phase-change core material emulsion;

[0040] 3) Preparation of phase-change microcapsule emulsion...

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Abstract

The invention discloses a preparation method of a high-thermal-conductivity super-hydrophobic phase change microcapsule. Melamine resin is used as a shell material, and n-alkane is used as a phase change core material. The preparation method comprises the following steps: firstly, carrying out graft modification on inorganic nanoparticles boron nitride and aluminum oxide with high heat conductivity coefficients by utilizing a silane coupling agent, so that the inorganic nanoparticles carry active groups such as amino and the like, can participate in cross-linking curing of a shell material, and have a certain hydrophilicity to increase the compatibility with a water-soluble melamine prepolymer; and then emulsifying the phase change core material by compounding an anionic emulsifier perfluorononenoxy sodium benzenesulfonate and a styrene-maleic anhydride copolymer, and then adding a mixed solution of the modified inorganic nanoparticles and a melamine prepolymer to finish surface cross-linking, curing and coating. The prepared phase change microcapsule is a monodisperse spherical particle, the heat conductivity coefficient can reach 0.562 W/(K.m), the water contact angle is 156 degrees, the phase change enthalpy value is 190 J/g, and the phase change microcapsule can serve as a hydrophobic energy storage material to be widely applied to the fields of functional textiles, building coatings and the like to achieve the purposes of energy conservation and environmental protection.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage materials, in particular to a preparation method of high thermal conductivity superhydrophobic phase change microcapsules. Background technique [0002] Phase change material is a kind of material that uses latent heat of phase change for energy storage. It absorbs and releases heat under the condition of approximately constant temperature during the phase change process to store heat energy and control temperature adjustment. Therefore, phase change energy storage technology is in the In the process of energy use, energy utilization efficiency can be greatly improved, and it has been widely used in the fields of aerospace, building materials, food packaging, and textiles and clothing. Issues such as volatilization and phase separation restrict the further development of phase change energy storage technology. [0003] Microencapsulation of phase change materials is to apply m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14C09K5/06
CPCB01J13/14C09K5/063
Inventor 康翼鸿喻学锋艾丹贾宝泉
Owner 武汉中科先进材料科技有限公司
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