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Method for improving polyethylene glycol phase change material performance by using modified silicon dioxide and phase change material

A technology of silicon dioxide and polyethylene glycol, applied in the field of chemical modification and phase change energy storage materials, can solve the problems of reducing enthalpy, restricting free movement, etc. The effect of capacitive enhancement

Active Publication Date: 2017-06-20
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nano-silica is a cheap, non-toxic, anti-aging and chemical property that can enhance other materials, and has a wide range of uses. However, adding silica directly to polyethylene glycol will increase its thermal conductivity, but Relatively, it will limit the free movement of its chain segments to a great extent, resulting in a lot of reduction in enthalpy

Method used

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  • Method for improving polyethylene glycol phase change material performance by using modified silicon dioxide and phase change material
  • Method for improving polyethylene glycol phase change material performance by using modified silicon dioxide and phase change material
  • Method for improving polyethylene glycol phase change material performance by using modified silicon dioxide and phase change material

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Embodiment 1

[0025] Such as figure 1 The present invention discloses a kind of method utilizing modified silicon dioxide to improve the performance of polyethylene glycol phase change material, and its method step is as follows:

[0026] Graft modification on the surface of silica: Disperse 3.0g of nano-silica into 25mL of benzene solution, add 25mL of thionyl chloride under nitrogen protection, react at 65 degrees Celsius for 4 hours, centrifuge, and After centrifugation, the product was dried in a vacuum oven at 60°C for 24 hours. This one-step reaction is to pretreat and activate the surface of nano-silica, so that the surface active hydroxyl groups can be reduced. Then, the treated silica was reacted with PEG400 by solution method, and PEG400 was grafted onto the surface of silica to obtain the final product SiO 2 -PEG400.

[0027] Preparation of modified silica and PEG6000 composite phase change material: SiO 2 - PEG400 and PEG6000 were dissolved in deionized water respectively, u...

Embodiment 2

[0037] Graft modification on the surface of silica: Disperse 3.0g of nano-silica into 25mL of benzene solution, add 25mL of thionyl chloride under nitrogen protection, react at 65 degrees Celsius for 4 hours, centrifuge, and After centrifugation, the product was dried in a vacuum oven at 60°C for 24 hours. This one-step reaction is to pretreat and activate the surface of nano-silica, so that the surface active hydroxyl groups can be reduced. Then, the treated silica was reacted with PEG300 by solution method, and PEG300 was grafted onto the surface of silica to obtain the final product SiO 2 -PEG300.

[0038] Preparation of modified silica and PEG6000 composite phase change material: SiO 2 - PEG300 and PEG6000 were dissolved in deionized water respectively, under magnetic stirring for 10 hours, the prepared solutions were mixed into different mass ratio solutions, under magnetic stirring for 5 hours, and then the solutions with different mass ratios were dried in an oven at ...

Embodiment 3

[0043] Graft modification on the surface of silica: Disperse 2.0g of nano silica into 25mL of benzene solution, add 25mL of thionyl chloride under nitrogen protection, react at 65 degrees Celsius for 4 hours, centrifuge, and After centrifugation, the product was dried in a vacuum oven at 60°C for 24 hours. This one-step reaction is to pretreat and activate the surface of nano-silica, so that the surface active hydroxyl groups can be reduced. Then, the treated silica was reacted with PEG200 by solution method, and PEG200 was grafted onto the surface of silica to obtain the final product SiO 2 -PEG200.

[0044] Preparation of modified silica and PEG6000 composite phase change material: SiO 2 - PEG200 and PEG6000 were dissolved in deionized water respectively, under magnetic stirring for 10 hours, the prepared solutions were mixed into different mass ratio solutions, under magnetic stirring for 5 hours, and then the solutions with different mass ratios were dried in an oven at ...

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Abstract

The invention discloses a method for improving the polyethylene glycol phase change material performance by using modified silicon dioxide and a phase change material. The silicon dioxide surface is modified by a chemical modification method; micromolecule polyethylene glycol is grafted, so that the silicon dioxide surfactivity is reduced to a certain degree; the limitation effect of the silicon dioxide on the polyethylene glycol is weakened; great phase change enthalpy is maintained to a certain degree; meanwhile, the heat conduction coefficient of the material is improved greatly. The silicon dioxide is used as a framework support material; the polyethylene glycol is used as the phase change material; the enthalpy of the composite phase change material mixed by the two materials is maintained to be 100J / g or higher; the heat conduction coefficient is improved by 43.3 percent than that of pure polyethylene glycol. The material has the advantages that the cost is reduced; the material is poisonless and harmless; the heat conduction coefficient of the solid-liquid phase change material can be effectively improved; good application prospects are realized.

Description

technical field [0001] The invention relates to the field of chemical modification and phase-change energy storage materials, in particular to a method for improving the performance of polyethylene glycol phase-change materials by using modified silicon dioxide and the phase-change materials. Background technique [0002] Phase change material is a functional material that can store and release a large amount of heat energy in a small range. Phase change material has a wide range of applications in many fields, such as solar energy storage, smart thermal insulation textiles, thermal protection of electronic devices, waste heat recycling etc. However, the disadvantages of traditional phase-change materials are very obvious. The low thermal conductivity greatly hinders the utilization efficiency of heat energy. In addition, solid-liquid phase-change materials are prone to leakage when storing heat energy. [0003] Polyethylene glycol has considerable enthalpy, consistent melt...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063Y02P20/10
Inventor 王瑶崔学伟唐建国刘继宪黄林军焦吉庆王彦欣王薇
Owner QINGDAO UNIV
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