Phase change material nano capsule and preparation method thereof

A technology of nanocapsules and phase change materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of difficult micron capsule phase change material slurry, capsule rupture, etc., to achieve reduced shell thickness, better Combining ability, improving the effect of phase change energy storage performance

Active Publication Date: 2019-04-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the research on phase change materials mainly focuses on micron capsule energy storage materials. However, there are many shortcomings in the application of micron capsule phase change material slurry. For example, if the particles of micron capsule phase change material slurry are not small enough , it will be difficult to maintain a stable and uniform flow of micron capsule phase change material slurry; in addition, there is also the possibility of capsule rupture during use

Method used

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  • Phase change material nano capsule and preparation method thereof
  • Phase change material nano capsule and preparation method thereof
  • Phase change material nano capsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A nanocapsule of phase change material, comprising the following steps of preparation:

[0028] (1) Weigh lauric acid, sodium lauryl sulfate, n-butanol, and deionized water in a ratio of 1:0.01:0.5:100 by weight, and weigh the fatty acid, anionic surfactant, and deionized water After the water is mixed, stir and melt in a 60°C water bath. After it is completely melted, add the additive dropwise, and stir well. The stirring speed is 900r / min, and the stirring time is 50min, and the lauric acid emulsion is obtained;

[0029] (2) Mix ethyl orthosilicate, absolute ethanol and deionized water in a volume ratio of 1:6:4, and stir evenly, then add ammonia water and continue stirring for 15 minutes. The amount of ammonia water added is the same as that of ethyl orthosilicate The volume ratio is 0.2:1, and the silica sol can be obtained by stirring evenly;

[0030] (3) Add the lauric acid emulsion prepared in step (1) dropwise to the silica sol prepared in step (2), keep the wa...

Embodiment 2

[0033] A nanocapsule of phase change material, comprising the following steps of preparation:

[0034] (1) Stearic acid and sodium lauryl sulfate, n-butanol and deionized water are weighed in a ratio of 1:0.01:0.5:100 by weight, and the weighed fatty acid and anionic surfactant, deionized water After the ionic water is mixed, it is stirred and melted in a 60°C water bath, and after it is completely melted, the additive is added dropwise, fully stirred evenly, the stirring speed is 900r / min, and the stirring time is 50min, and the stearic acid emulsion is obtained;

[0035] (2) Mix ethyl orthosilicate, absolute ethanol and deionized water in a volume ratio of 1:6:4, and stir evenly, then add ammonia water and continue stirring for 15 minutes. The amount of ammonia water added is the same as that of ethyl orthosilicate The volume ratio is 0.2:1, and the silica sol can be obtained by stirring evenly;

[0036] (3) Add the stearic acid emulsion prepared by step (1) dropwise into t...

Embodiment 3

[0039] A nanocapsule of phase change material, comprising the following steps of preparation:

[0040] (1) Weigh palmitic acid, sodium lauryl sulfate, n-butanol and deionized water in a ratio of 1:0.01:0.5:100 by weight, and weigh the fatty acid and anionic surfactant, deionized After the water is mixed, stir and melt in a 75°C water bath. After it is completely melted, add the additive dropwise, and stir well. The stirring speed is 900r / min, and the stirring time is 50min, and the palmitic acid emulsion is obtained;

[0041](2) Mix ethyl orthosilicate, absolute ethanol and deionized water in a volume ratio of 1:6:4, and stir evenly, then add ammonia water and continue stirring for 15 minutes. The amount of ammonia water added is the same as that of ethyl orthosilicate The volume ratio is 0.2:1, and the silica sol can be obtained by stirring evenly;

[0042] (3) Add the palmitic acid emulsion prepared in step (1) dropwise to the silica sol prepared in step (2), keep the water...

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Abstract

The invention discloses a phase change material nano capsule and a preparation method thereof. The phase change material nano capsule takes silica as a shell layer and fatty acids as a core material,is spherical, and has a D50 of 100 nm to 200 nm, a particle diameter distribution coefficient K of 0.3-0.7, and a shell thickness of 20-40 nm. The phase change material nano capsule can maintain gooddispersing performance when the particle diameter is less than 200 nm, and reduces the agglomeration phenomenon among particle diameters.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a phase change material nanocapsule and a preparation method thereof. Background technique [0002] A composite phase change material with a core-shell structure is formed by coating a polymer film with stable performance on the surface of the phase change material through microcapsule technology, that is, a phase change material microcapsule. The phase change material microcapsule is composed of an outer shell material and a core material. At present, the phase change materials that can be used as core materials include crystalline hydrated salts, branched alkanes, fatty acids, paraffins, etc. Among them, crystalline hydrated salts and paraffins are more widely used. The wall material can provide a stable phase change space for the internal phase change material, mainly for protection and sealing. [0003] At present, the research on phase change materials mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 白皓袁换美
Owner UNIV OF SCI & TECH BEIJING
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