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Preparation method of silica coated PEG (polyethylene glycol) phase-change material

A technology of polyethylene glycol and silicon dioxide, which is applied in the direction of chemical instruments and methods, heat exchange materials, etc., can solve the problems of easy leakage and limited application, and achieve leakage prevention, small volume change, and low cost Effect

Inactive Publication Date: 2018-12-28
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Polyethylene glycol, also known as polyethylene glycol ether, is a phase change material with large heat enthalpy and good wear resistance. Ordinary polyethylene glycol will change solid-liquid phase during the storage of human energy, which is easy to Leakage occurred, resulting in limited application

Method used

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  • Preparation method of silica coated PEG (polyethylene glycol) phase-change material

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Embodiment 1

[0019] The invention discloses a method for preparing a silicon dioxide-coated polyethylene glycol phase-change material. The steps of the method are as follows:

[0020] The preparation method of silicon dioxide ethanol solution: first SiO 2 Configured as 2mg / mL SiO 2 Ethanol solution, then add concentrated hydrochloric acid dropwise to adjust the pH to about 2, and finally sonicate for 10 minutes to disperse the silica evenly in ethanol.

[0021] The method of silica-coated polyethylene glycol: in the resulting 5mL SiO 2 Add 500 mg of polyethylene glycol with a molecular weight of 6000 to the ethanol solution, adjust the temperature of the solution to 60°C, and wait for the polyethylene glycol to dissolve in SiO 2 It can be uniformly dispersed in ethanol solution, and the solution is ultrasonicated for 4 minutes, and the ultrasonic power used is 20%. Then put it in an ice-water bath and wait for it to cool down, centrifuge it at 10000r / min for 10min, pour off the solvent ...

Embodiment 2

[0028] The preparation method of silicon dioxide ethanol solution: first SiO 2 Configured as 2mg / mL SiO 2 Ethanol solution, then add concentrated hydrochloric acid dropwise to adjust the pH to about 2, and finally sonicate for 10 minutes to disperse the silica evenly in ethanol.

[0029] The method of silica-coated polyethylene glycol: in the resulting 5mL SiO 2 Add 550 mg of polyethylene glycol with a molecular weight of 8000 to the ethanol solution, adjust the temperature of the solution to 60 ° C, and wait for the polyethylene glycol to dissolve in SiO 2 It can be uniformly dispersed in ethanol solution, and the solution is ultrasonicated for 5 minutes, and the ultrasonic power used is 20%. Then put it in an ice-water bath and wait for it to cool down, centrifuge it at 10000r / min for 10min, pour off the solvent in the upper layer, and obtain the silica-coated polyethylene glycol microcapsule phase change material.

[0030] Preferably, the purity of the ethanol, polyethyl...

Embodiment 3

[0032] The preparation method of silicon dioxide ethanol solution: first SiO 2 Configured as 2mg / mL SiO 2 Ethanol solution, then add concentrated hydrochloric acid dropwise to adjust the pH to about 2, and finally sonicate for 10 minutes to disperse the silica evenly in ethanol.

[0033] The method of silica-coated polyethylene glycol: in the resulting 5mL SiO 2 Add 6000 mg of polyethylene glycol with a molecular weight of 10,000 to the ethanol solution, adjust the temperature of the solution to 60°C, and wait until the polyethylene glycol is dissolved in SiO 2 It can be uniformly dispersed in ethanol solution, and the solution is ultrasonicated for 5 minutes, and the ultrasonic power used is 20%. Then put it in an ice-water bath and wait for it to cool down, centrifuge it at 10000r / min for 10min, pour off the solvent in the upper layer, and obtain the silica-coated polyethylene glycol microcapsule phase change material.

[0034] Preferably, the purity of the ethanol, polye...

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Abstract

The invention discloses a preparation method of a silica coated PEG (polyethylene glycol) phase-change material. According to the preparation method, PEG and silica with different molecular weights are mixed with an ultrasonic method, silica coated PEG is prepared, and energy storage properties of silica coated PEG are characterized. Silica is used as a supporting material, PEG is used as a phase-change material, the two materials are mixed to form a solid-solid phase-change material, so that phase change is avoided in a change process of alkane polymers while phase-change thermal energy is stored, and the problem of leakage of the phase-change material is solved effectively. The material saves cost, is non-toxic and harmless, can effectively keep enthalpy of the solid-solid phase-change material and has quite good application prospect.

Description

technical field [0001] The invention relates to the technical field of solid-solid energy storage materials, in particular to a method for preparing silicon dioxide-coated polyethylene glycol phase-change materials by an ultrasonic method. Background technique [0002] Phase change materials are a class of materials that have been widely used in various aspects of life such as heat energy recovery and building insulation in recent years. Solid-solid phase change materials are a type of phase change materials that can absorb heat and release heat to store energy at a small temperature, have small volume changes, do not appear in a liquid state, do not require packaging, and are easy to process and shape. Solid-liquid phase change materials are prone to leakage when storing heat energy, but solid-solid phase change materials do not have this problem in the process of storing heat energy. Therefore, solid-solid phase change materials that can effectively prevent leakage have a ...

Claims

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Application Information

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IPC IPC(8): C09K5/02
CPCC09K5/02
Inventor 姜倩倩郎鹏袁楠楠李洁吴智睿时德政唐建国
Owner QINGDAO UNIV
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