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Paraffin-hydrophobic polysilsesquioxane aerogel composite sized phase-change material and preparation method thereof

A technology of polysilsesquioxane and shape-setting phase-change materials, which is applied in the direction of heat exchange materials, chemical instruments and methods, and can solve the problems of large volume changes of polymer carriers, low load capacity of phase-change materials, low temperature resistance and Inflammable and other problems, achieve low cost, simple preparation process, and improve heat storage capacity

Inactive Publication Date: 2018-04-06
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a paraffin-hydrophobic polysilsesquioxane airgel composite shape-setting phase change material and a preparation method thereof. Problems, the preparation of graphite foam and carbon nanotubes requires high temperature, complicated process, high energy consumption, and low loading capacity of phase change materials, etc.

Method used

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  • Paraffin-hydrophobic polysilsesquioxane aerogel composite sized phase-change material and preparation method thereof
  • Paraffin-hydrophobic polysilsesquioxane aerogel composite sized phase-change material and preparation method thereof
  • Paraffin-hydrophobic polysilsesquioxane aerogel composite sized phase-change material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Hydrophobic polysilsesquioxane airgel is prepared by mixing and stirring alkyl group-containing trialkoxysilane with distilled water to obtain a transparent solution, wherein the content of alkyl group-containing trialkoxysilane is 16wt %, and then add concentrated ammonia water to adjust the pH value of the solution to 11.5 to make the solution gel to obtain a gel; soak the gel in distilled water and age it at 70°C for 20 h, and then dry the aged gel naturally under normal pressure Or heating and drying to prepare bulky hydrophobic polysilsesquioxane airgel. The prepared hydrophobic polysilsesquioxane airgel has a contact angle of 175° and a density of 0.07 g cm -3 , the porosity is 96%, and the pore size distribution is 200~1200 nm.

[0037] Heat the paraffin to melt to a temperature of 100°C.

[0038] The hydrophobic polysilsesquioxane airgel is immersed in the molten paraffin liquid to fill the pores of the airgel with paraffin, and the paraffin / hydrophobic polysi...

Embodiment 2

[0040] Hydrophobic polysilsesquioxane airgel is prepared by mixing and stirring alkyl group-containing trialkoxysilane with distilled water to obtain a transparent solution, wherein the content of alkyl group-containing trialkoxysilane is 20wt %, then add concentrated ammonia water to adjust the pH value of the solution to 11.0 to gel the solution to obtain a gel; soak the gel in distilled water and age it at 60°C for 16 h, and then dry the aged gel naturally under normal pressure Or heating and drying to prepare bulky hydrophobic polysilsesquioxane airgel. The prepared hydrophobic polysilsesquioxane airgel has a contact angle of 165° and a density of 0.12 g cm -3 , the porosity is 92.9%, and the pore size distribution is 120~1000 nm.

[0041] Heat the paraffin to melt to a temperature of 120°C.

[0042]The hydrophobic polysilsesquioxane airgel is immersed in the molten paraffin liquid to fill the pores of the airgel with paraffin, and the paraffin / hydrophobic polysilsesquio...

Embodiment 3

[0044] Hydrophobic polysilsesquioxane airgel is prepared by mixing and stirring alkyl group-containing trialkoxysilane with distilled water to obtain a transparent solution, wherein the content of alkyl group-containing trialkoxysilane is 24wt %, and then add concentrated ammonia water to adjust the pH value of the solution to 10 to make the solution gel to obtain a gel; soak the gel in distilled water and age it at 50°C for 14 h, and then dry the aged gel naturally under normal pressure Or heating and drying to prepare bulky hydrophobic polysilsesquioxane airgel. The prepared hydrophobic polysilsesquioxane airgel has a contact angle of 154° and a density of 0.18 g cm -3 , the porosity is 89.3%, and the pore size distribution is 60~760 nm.

[0045] The paraffin is heated and melted so that its temperature reaches 160°C.

[0046] The hydrophobic polysilsesquioxane airgel is immersed in the molten paraffin liquid to fill the pores of the airgel with paraffin, and the paraffin / ...

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Abstract

The invention discloses a paraffin-hydrophobic polysilsesquioxane aerogel composite sized phase-change material which is characterized by comprising paraffin and a hydrophobic polysilsesquioxane aerogel, wherein the paraffin is taken as a phase-change core material and the hydrophobic polysilsesquioxane aerogel is taken as a supporting carrier; the content of paraffin is 80-96wt%, the content of hydrophobic polysilsesquioxane aerogel is 4-20wt%, and the enthalpy value of the composite phase material is 160-190J.g. The material disclosed by the invention solves the problem that existing high molecular carrier is great in size change and is not high-temperature-resistant and flammable, and solves the problems that when the material is prepared by using graphite foam and a carbon nanotube, high temperature is needed, and the process is complex, the energy consumption is high, and the loading capacity of the phase-change material is relatively low and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of shape-fixed phase-change materials, in particular to a paraffin-hydrophobic polysilsesquioxane airgel composite shape-set phase-change material and a preparation method thereof. Background technique [0002] Phase change materials have a material phase change at the phase change temperature within a specific temperature or temperature range, and absorb or release a large amount of latent heat of phase change along with the phase change process, which can be used for heat storage or cold storage. It has broad application prospects in power peak regulation and other aspects. As a phase change material, paraffin wax has high latent heat of phase change, no supercooling phenomenon, no need to add nucleating agent during use, stable chemical performance, cheap price and easy access. However, paraffin wax is easy to leak after melting, which limits the further use of paraffin wax. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C08G77/04C08G77/06C08J9/28C08J9/42C08L83/04C08L91/06
CPCC08G77/045C08G77/06C08J9/286C08J9/42C08J2201/0504C08J2383/04C08J2491/06C09K5/063
Inventor 云山郭探高晓燕张世忠何磊洪坤陈静
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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