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Preparing method for polyethylene glycol/nano-silicon dioxide composite phase change material

A nano-silica, composite phase change material technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of the maximum graft ratio of polyethylene glycol, the limited number of hydroxyl groups, etc., and achieve the phase change enthalpy. and the effect of reducing the phase transition temperature and improving the thermal conductivity

Inactive Publication Date: 2017-04-05
李博琪
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Problems solved by technology

[0002] In the past, there have been reports on the preparation of composite phase change materials. The relatively new technology is the preparation of polyethylene glycol / silica grafted composite phase change materials. Agglomeration will inevitably occur after modification and compounding. In the composite system, the particle size reaches hundreds of nanometers, which belongs to the micron-scale structure, and the number of hydroxyl groups on the surface is limited, which leads to a certain limit on the maximum grafting rate of polyethylene glycol.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Preparation of siloxane-terminated PEG prepolymer: Add 8g of vacuum-dried PEG into the conical flask, add 20mL of toluene into the conical flask, drop in 1.65g of KH-560, stir evenly, and then drop in 0.1g of boron trifluoride diethyl ether, stirred and reacted for 4 hours in an oil bath at 90°C, and then filtered the obtained solution with filter paper to remove the white sedimentation particles of boron hydroxide generated after the hydrolysis of boron trifluoride to obtain silicon A solution of oxane-terminated polyethylene glycol in toluene.

[0023] 2) Preparation of polyethylene glycol / nano-silica composite phase change material by sol-gel method: add 4 g of TEOS to the toluene solution prepared in step 1), stir evenly, and ultrasonicate for 5 minutes, drop by drop during ultrasonication Add hydrochloric acid / ethanol / water solution with pH=1, with the addition of hydrochloric acid aqueous solution, the system gradually turns milky white, forming a water-in-oil ...

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Abstract

The invention provides a preparing method for a polyethylene glycol / nano-silicon dioxide composite phase change material. Firstly, polyethylene glycol and a silane coupling agent are subjected to the reaction, prepolymer with a siloxane end group is generated; after the prepolymer and ethyl orthosilicate are mixed uniformly, the PEG-SiO2 sol system is prepared through the acid catalysis hydrolysis-condensation reaction, gel is obtained through volatilization of a solvent, and the polyethylene glycol / nano-silicon dioxide composite phase change material is obtained through drying. By means of the polyethylene glycol / nano-silicon dioxide composite phase change material prepared through the method, the heat conductivity of a compound system can be greatly improved, and the phase change enthalpy and the phase change temperature are obviously reduced.

Description

technical field [0001] The invention relates to the field of preparation of organic chemical composite phase-change materials, in particular to a preparation method of polyethylene glycol / nanometer silicon dioxide composite phase-change materials. Background technique [0002] In the past, there have been reports on the preparation of composite phase change materials. The relatively new technology is the preparation of polyethylene glycol / silica grafted composite phase change materials. Agglomeration will inevitably occur after modification and compounding. In the composite system, the particle size reaches hundreds of nanometers, which belongs to the micron-scale structure, and the number of hydroxyl groups on the surface is limited, which leads to a certain limit on the maximum grafting rate of polyethylene glycol. Contents of the invention [0003] Aiming at the above two problems, the present invention provides a method for preparing polyethylene glycol / nano silicon di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 不公告发明人
Owner 李博琪
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