Preparation method of polyethylene glycol/silicon dioxide shape-fixed phase-change material

A technology of shape-setting phase change material and polyethylene glycol, which is applied in the field of phase change energy storage, can solve the problems of low thermal conductivity, low thermal conductivity, slow heat storage and release speed, etc., and achieves good thermal stability, high thermal conductivity, simple craftsmanship

Active Publication Date: 2020-10-30
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low thermal conductivity of pure PEG itself, only 0.128W / (m k), the general sol-gel method to prepare PEG / SiO 2 The thermal conductivity of shape-changed phase change energy storage materials is low, and the heat storage and release rate is too slow, resulting in a decrease in thermal energy storage and utilization efficiency, which limits its application in engineering practice

Method used

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  • Preparation method of polyethylene glycol/silicon dioxide shape-fixed phase-change material
  • Preparation method of polyethylene glycol/silicon dioxide shape-fixed phase-change material
  • Preparation method of polyethylene glycol/silicon dioxide shape-fixed phase-change material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Measure 60 milliliters of isopropanol (IPA) and 14 milliliters of deionized water and place them in a 100 milliliter round-bottomed flask, then weigh 5 grams of polyethylene glycol (PEG6000) and add them, at room temperature (25 ° C), rotating speed Under the condition of 500r / min, stir for 30 minutes, so that polyethylene glycol can be fully and rapidly dissolved in isopropanol and the volatilization of isopropanol should be minimized to form a uniform colorless and transparent mixed solution I.

[0037] Take 1mL of 3-aminopropyl-3-ethoxysilane ethanol solution (the volume ratio of 3-aminopropyl-3-ethoxysilane to ethanol is 1:19, ethanol is 99.5% analytically pure, and it is now prepared ) and 0.667mL of hydrochloric acid with a molar concentration of 0.2mol / L were mixed in a 50mL beaker, and then immediately added to the above mixed solution I, and stirred at room temperature (25°C) and at a speed of 500r / min After 6 minutes, mixed solution II was obtained.

[0038] ...

Embodiment 2

[0065] Measure 60 milliliters of isopropanol (IPA), 18 milliliters of deionized water to form a mixed solvent in a 100 milliliter round bottom flask, weigh 5 grams of polyethylene glycol (PEG6000) and join in the mixed solvent, at room temperature (18 ℃ ), stirring evenly for 30 minutes at a speed of 500r / min, so that the polyethylene glycol is fully and quickly dissolved in isopropanol and the volatilization of isopropanol is minimized to form a uniform colorless and transparent mixed solution I.

[0066]Take 1mL of 3-aminopropyl-3-ethoxysilane ethanol solution (the volume ratio of 3-aminopropyl-3-ethoxysilane to ethanol is 1:19, ethanol is 99.5% analytically pure, ready to use) Mix it with 0.667mL0.2mol / L hydrochloric acid in a 50mL beaker, then immediately add it to the above mixed solution I, and continue to stir evenly for 6 minutes at room temperature (18°C) at a speed of 500r / min to obtain a mixed Solution II.

[0067] Measure 0.25 ml (1.1 mmol) tetraethyl orthosilicat...

Embodiment 3

[0070] Measure 60 milliliters of isopropanol (IPA), 14 milliliters of deionized water in a 100 milliliter round-bottomed flask, weigh 3 grams of polyethylene glycol (PEG6000) and add it to the mixed solvent at room temperature (18° C.) Stir uniformly for 30 minutes under the condition of 500r / min, so that the polyethylene glycol is fully and quickly dissolved in isopropanol and the volatilization of isopropanol is minimized to form a uniform colorless and transparent mixed solution I.

[0071] Take 1mL of 3-aminopropyl-3-ethoxysilane ethanol solution (the volume ratio of 3-aminopropyl-3-ethoxysilane to ethanol is 1:19, ethanol is 99.5% analytically pure, ready to use) Mix it with 0.667mL0.2mol / L hydrochloric acid in a 50mL beaker, then immediately add it to the above mixed solution I, and continue to stir evenly for 6 minutes at room temperature (18°C) at a speed of 500r / min to obtain a mixed Solution II.

[0072] Measure 0.25 ml (1.1 mmol) tetraethyl orthosilicate (TEOS) int...

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Abstract

The invention discloses a preparation method of a polyethylene glycol / silicon dioxide shaped phase change material. The preparation method includes the following steps: dissolving polyethylene glycolin a mixed solution of isopropanol and deionized water at room temperature, immediately adding a mixture of an ethanol solution of 3-aminopropyl-3-ethoxysilane and hydrochloric acid into the mixed solution, adding ethyl orthosilicate into the mixed solution for reaction, and drying to obtain the final product. The method of the invention is simple in process and can be realized at room temperature. The polyethylene glycol / silicon dioxide shaped phase change material prepared by the preparation method of the invention has no chemical change in the preparation process, has only simple physical combination among molecules, has no change in the regularity of molecular chains of polyethylene glycol, has the advantages of high crystallinity, high phase change enthalpy, proper thermal conductivity, good packaging effect and simple product transportation, and can effectively solve the problem of liquid phase leakage during use of the material.

Description

technical field [0001] The invention belongs to the field of phase change energy storage, and in particular relates to a preparation method of a polyethylene glycol / silicon dioxide shaped phase change material. Background technique [0002] Phase change materials refer to materials that absorb, store and release heat in the form of latent heat while maintaining their own temperature when a phase transition occurs. As an advanced energy storage material, phase change materials have attracted extensive attention in various fields due to their high energy storage density, stable chemical structure and excellent temperature control characteristics, such as solar energy storage, intelligent thermal insulation textiles, Thermal protection of electronic devices, waste heat recovery, etc. Solid-liquid phase change materials have become the most feasible and most practical phase change materials currently considered by scientific researchers because of their high heat storage densit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/02
CPCC09K5/02
Inventor 翟兰兰孙希萍王瑞芳邹超刘若望柴玉叶
Owner WENZHOU UNIVERSITY
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