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Controllable preparation method of clay-based microcapsule phase change materials

A technology of phase change materials and microcapsules, which is applied in the direction of microcapsule preparation, microsphere preparation, heat exchange materials, etc., can solve the problems of poor mechanical strength, different lengths of polymer chain segments, and large internal stress, etc., and achieve reduction Preparation cost, narrow molecular weight distribution, and effect of improving thermal stability

Active Publication Date: 2020-09-25
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer chain segment lengths prepared by the ordinary free radical polymerization or stepwise polymerization method are different, the internal stress is large, and the mechanical strength is poor.
In addition, the inorganic phase is mostly limited to more expensive graphene, titanium dioxide, silicon dioxide and other materials.

Method used

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  • Controllable preparation method of clay-based microcapsule phase change materials
  • Controllable preparation method of clay-based microcapsule phase change materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] Weigh 3 g of hexadecane, 2 g of butyl acrylate, 1 g of ethylene glycol dimethacrylate, 0.02 g of ethyl α-bromophenylacetate, and 0.01 g of triethylamine / syringe red Y to form an organic phase ;Weigh 0.15g of attapulgite clay of ≥200 mesh and add it to 10g of deionized water, and ultrasonically disperse to form a water phase; mix the organic phase and water phase in a transparent reaction vessel with a mass ratio of 5:10, and emulsify at high speed On-board emulsification forms a stable emulsion. Seal the transparent reaction container and transfer it to a photopolymerization device, and polymerize for 2 h; after the polymerization, unseal and centrifuge to obtain a white powdery solid, wash the powder with ethanol several times and centrifuge, and open the obtained solid powder at room temperature The mouth was dried to constant weight to obtain the attapulgite clay-based microcapsule phase change material.

[0029] Such as figure 1 SEM image of the attapulgite / acryli...

Embodiment approach 2

[0032] Weigh 2 g of eicosane, 2 g of methyl acrylate, 1 g of trimethylolpropane trimethacrylate as a crosslinking agent, 0.01 g of ethyl 2-bromoisobutyrate, and 0.005 g of triethylamine / fluorescein Dissolve together to form an organic phase; weigh 0.2 g of kaolin ≥ 200 mesh and add it to 10 g of deionized water, and ultrasonically disperse to form an aqueous phase; mix the organic phase and the aqueous phase in a transparent reaction vessel at a mass ratio of 2:7, and Emulsify on a high-speed emulsifier to form a stable emulsion. Seal the transparent reaction container and transfer it to a photopolymerization device, and polymerize for 3 h; after the polymerization, unseal and centrifuge to obtain a white powdery solid, wash the powder with ethanol several times and centrifuge, and vacuum the obtained solid powder at room temperature Dry to constant weight to obtain kaolin-based microcapsule phase change material.

Embodiment approach 3

[0034] Weigh 4 g of docosane, 2 g of octadecyl acrylate, 1 g of trimethylolpropane trimethacrylate as a crosslinking agent, 0.015 g of 2-bromopropionitrile, and 0.0025 g of triethylamine / rhodamine 6G in Form an organic phase together; weigh 0.5 g of montmorillonite ≥ 200 mesh and add it to 10 g of deionized water, and ultrasonically disperse to form an aqueous phase; mix the organic phase and the aqueous phase in a transparent reaction vessel at a mass ratio of 5:7, and Emulsify on a high-speed emulsifier to form a stable emulsion. Seal the transparent reaction vessel, transfer it to a photopolymerization device, and polymerize for 5 h; after the polymerization, unseal and centrifuge to obtain a white powdery solid, wash the powder with ethanol several times and centrifuge, and vacuum the obtained solid powder at room temperature Dry to constant weight to obtain the montmorillonite-based microcapsule phase change material.

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Abstract

The invention relates to the technical field of microcapsule phase-change material preparation, and discloses a controllable preparation method of a clay-based microcapsule phase-change material. Thecontrollable preparation method comprises the following steps: dissolving a long-chain alkane phase-change medium, an acrylate monomer, a crosslinking agent, an ATRP initiator and an ATRP organic catalyst together to form an organic phase; adding clay into deionized water, and carrying out ultrasonic dispersion to form a water phase; mixing the organic phase and the water phase in a transparent reaction container, and emulsifying into an emulsion; sealing the transparent reaction container and transferring the transparent reaction container into a photopolymerization device to polymerize for 1-5 hours; and after the polymerization is finished, unsealing and centrifuging to obtain a white powdery solid, washing the white powdery solid with ethanol, centrifuging, and carrying out vacuum drying on an obtained solid powder at room temperature to constant weight to obtain the clay-based microcapsule phase change material. According to the invention, green and efficient photo-induced organiccatalytic atom transfer radical polymerization technology is introduced into the preparation of microcapsule phase change materials with clay-based hybrid capsule walls, so that the thermal stability and the mechanical strength of the capsule walls can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of preparation of microcapsule phase change materials, in particular to a controllable preparation method of clay-based microcapsule phase change materials. Background technique [0002] Microencapsulated phase change materials have the characteristics of high latent heat of phase change, suitable phase change temperature, easy adjustment and low leakage, etc., and have broad application prospects in the fields of heat utilization and temperature regulation. The heat storage and temperature adjustment performance of microcapsule phase change materials is not only related to the phase change medium of the capsule core, but also the capsule wall plays a crucial role. At present, the capsule wall materials mainly wrap organic polymer materials, inorganic materials and organic-inorganic hybrid materials. Inorganic materials have high thermal conductivity and thermal stability, but their lack of toughness makes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06B01J13/16
CPCB01J13/16C09K5/063
Inventor 姜孝武王子权鲍雁赵帅刘永涛倪伶俐
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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