Silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material, and preparation method thereof

A technology of silica and phase change materials, applied in the direction of microcapsule preparation, microsphere preparation, heat exchange materials, etc., can solve the problems of supercooling, single function, poor thermal conductivity, etc. Broadening, strengthening and densifying effects

Active Publication Date: 2016-01-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to effectively improve the problems of poor thermal conductivity, serious supercooling phenomenon, and single function in the preparation of existing microcapsules, realize its functional diversity and expand its application field, the present invention provides a high-conductivity, antibacterial Multifunctional microcapsule phase change materials with properties, energy storage and temperature regulation

Method used

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  • Silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material, and preparation method thereof
  • Silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material, and preparation method thereof
  • Silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034](1) Preparation of core material emulsion:

[0035] In a water bath at a temperature of 80°C, mix 2.5g of n-eicosane, 0.6g of cetyltrimethylammonium bromide, 3.5g of tetraethylorthosilicate, 1g of γ-mercaptopropyltrimethoxysilane, and 50ml of formaldehyde Amides were mixed evenly, and stirred at 300r / min for 1h to obtain a uniform and stable emulsion.

[0036] (2) Preparation of mercapto-containing silica inner wall:

[0037] Keep the temperature constant, add 25ml of 40wt.% hydrochloric acid aqueous solution dropwise to the emulsion formed in step 1, stir for 4h at a speed of 350r / min, turn off the stirring, and mature for 24h; take out the product, filter it, and rinse it several times with ultrapure water , to a pH value of 7, and dried at 50°C.

[0038] (3) Preparation of nano-silver outer layer wall material:

[0039] Raise the temperature to 80°C, under a nitrogen atmosphere, take 0.2g of microcapsules from step (2), mix with 95ml N,N-dimethylformamide, 4g polyv...

Embodiment 2

[0042] (1) Preparation of core material emulsion:

[0043] In a water bath at a temperature of 40°C, mix 2g of n-octadecane, 1g of sodium dodecylsulfonate, 3g of tetraethyl orthosilicate, 1g of γ-mercaptopropyltrimethoxysilane, and 45ml of formamide. Stirring for 1 h at a rotating speed of 1 / min to obtain a uniform and stable emulsion.

[0044] (2) Preparation of mercapto-containing silica inner wall:

[0045] Keep the temperature constant, add 40ml of 30wt.% hydrochloric acid aqueous solution dropwise to the emulsion formed in step 1, stir at 500r / min for 4h, turn off the stirring, and mature for 24h; take out the product, filter it, and rinse it several times with ultrapure water , to a pH value of 7, and dried at 50°C.

[0046] (3) Preparation of nano-silver outer layer wall material:

[0047] Raise the temperature to 90°C, under a nitrogen atmosphere, take 0.2g of microcapsules from step (2), mix with 95ml N,N-dimethylformamide, 4g polyvinylpyrrolidone, stir for 0.5h to...

Embodiment 3

[0050] (1) Preparation of core material emulsion:

[0051] In a water bath at a temperature of 40°C, mix 6g of n-nonadecane, 2g of cetyltrimethylammonium bromide, 6g of methyltrimethoxysilane, 0.3g of Span80, 0.4g of Tween, and 60ml of formamide. Stirring for 1.5 h at a speed of min, a uniform and stable emulsion was obtained.

[0052] (2) Preparation of mercapto-containing silica inner wall:

[0053] Keep the temperature constant, add 45ml of 35wt.% hydrochloric acid aqueous solution dropwise to the emulsion formed in step 1, stir at 350r / min for 5h, turn off the stirring, and mature for 24h; take out the product, filter it, and rinse it several times with ultrapure water , to a pH value of 7, and dried at 50°C.

[0054] (3) Preparation of nano-silver outer layer wall material:

[0055] Raise the temperature to 50°C, under nitrogen atmosphere, take 0.3g of microcapsules from step (2), mix with 94ml N,N-dimethylformamide, 5g polyvinylpyrrolidone, stir for 0.5h to exclude ox...

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Abstract

The invention discloses a silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material, and a preparation method thereof, and belongs to the field of microcapsule phase-change material. According to the preparation method, an organic phase change material, a silicon source, a modification agent with mercapto functional groups, an emulsifier, and a solvent are mixed and stirred so as to obtain an emulsion, and an initiator is added dropwise so as to obtain silicon dioxide signal-layer wall material microcapsules with mercapto groups; the silicon dioxide signal-layer wall material microcapsules, a silver source, a protective agent, and a reducing agent are mixed, and silver ion self assembling and reduction reaction are realized on the microcapsule surfaces under nitrogen protection so as to obtain the nano silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material. Particle size of the nano silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material ranges from 2 to 10<mu>m, possesses a double-layer structure composed of a metallic silver outer layer and an inorganic material silicon dioxide inner layer, is compact in structure, and high in thermal conductivity, possesses electrical conductivity, antibacterial properties, latent heat storage properties, and temperature regulation performance, and can be widely applied to the fields such as medicine, weaving, electron, and spaceflight.

Description

technical field [0001] The invention belongs to the field of microcapsule phase change materials, in particular to a multifunctional microcapsule phase change material based on silver / silicon dioxide double wall material and a preparation method thereof. Background technique [0002] In recent years, energy and environmental issues have become two important issues that human beings need to face. Fossil fuels account for nearly 80% of the energy sources, and the combustion of fossil fuels has brought serious environmental problems. Sustainable development and the utilization of renewable energy have become an important concern. Thermal energy storage systems provide the possibility for energy storage. Latent heat storage is the most effective way of thermal energy storage. Phase change material is a kind of latent heat storage material, and the heat transfer is realized through the phase transition of the material. However, traditional phase change materials have some disad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/20A01N59/16A01N25/28A01P1/00
Inventor 汪晓东张潇予武德珍
Owner BEIJING UNIV OF CHEM TECH
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