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Preparation method of polyethylene glycol/silicon dioxide shaped 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: 2019-07-23
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 shaped phase change material
  • Preparation method of polyethylene glycol/silicon dioxide shaped phase change material
  • Preparation method of polyethylene glycol/silicon dioxide shaped phase change material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Measure out 60 ml of isopropanol (IPA) and 14 ml of deionized water and place them in a 100 ml round-bottomed flask. Then weigh 5 g of polyethylene glycol (PEG6000) and add them to it at room temperature (25°C), rotating speed Under the condition of 500r / min, stir for 30 minutes to make the polyethylene glycol fully and quickly dissolve in the isopropanol and minimize the volatilization of the isopropanol to form a uniform, colorless and transparent mixed solution I.

[0037] Mix 1 mL of 3-aminopropyl-3-ethoxysilane in ethanol (the volume ratio of 3-aminopropyl-3-ethoxysilane to ethanol is 1:19, and the ethanol is 99.5% pure for analysis. Use) and 0.667mL hydrochloric acid with a molar concentration of 0.2mol / L in a 50mL beaker, and then immediately add it to the above mixed solution I immediately, and stir at room temperature (25℃) at a speed of 500r / min After 6 minutes, a mixed solution II was obtained.

[0038] Measure 0.25 ml (1.1 mmol) of ethyl orthosilicate (TEOS) and...

Embodiment 2

[0065] Measure 60 ml of isopropanol (IPA) and 18 ml of deionized water in a 100 ml round bottom flask to form a mixed solvent, weigh 5 g of polyethylene glycol (PEG6000) into the mixed solvent, and place it at room temperature (18°C). ), stir uniformly for 30 minutes under the condition of rotation speed of 500r / min, so that polyethylene glycol is fully and quickly dissolved in isopropanol and the volatilization of isopropanol is reduced as much as possible to form a homogeneous colorless and transparent mixed solution I.

[0066] Mix 1mL of 3-aminopropyl-3-ethoxysilane in ethanol (the volume ratio of 3-aminopropyl-3-ethoxysilane to ethanol is 1:19, ethanol is 99.5% analytically pure, ready for use now) Mix it with 0.667mL 0.2mol / L hydrochloric acid in a 50mL beaker, and then quickly add it to the above mixed solution I immediately, and continue to stir evenly for 6 minutes at room temperature (18°C) at a speed of 500r / min to obtain a mixture Solution II.

[0067] Measure 0.25 ml ...

Embodiment 3

[0070] Measure 60 ml of isopropanol (IPA) and 14 ml of deionized water into a 100 ml round bottom flask, weigh 3 g of polyethylene glycol (PEG6000) into the mixed solvent, at room temperature (18°C), rotating Stir uniformly for 30 minutes under the condition of 500r / min, so that polyethylene glycol is fully and quickly dissolved in isopropanol and the volatilization of isopropanol is reduced as much as possible, forming a uniform colorless and transparent mixed solution I.

[0071] Mix 1mL of 3-aminopropyl-3-ethoxysilane in ethanol (the volume ratio of 3-aminopropyl-3-ethoxysilane to ethanol is 1:19, ethanol is 99.5% analytically pure, ready for use now) Mix it with 0.667mL 0.2mol / L hydrochloric acid in a 50mL beaker, and then quickly add it to the above mixed solution I immediately, and continue to stir evenly for 6 minutes at room temperature (18°C) at a speed of 500r / min to obtain a mixture Solution II.

[0072] Measure 0.25 ml (1.1 mmol) of ethyl orthosilicate (TEOS) and add i...

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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 specifically relates to a preparation method of polyethylene glycol / silicon dioxide shape-setting phase change material. Background technique [0002] Phase change material refers to a material that absorbs, stores and releases heat in the form of latent heat while maintaining its own temperature during a phase transition. As an advanced energy storage material, phase change material has attracted wide attention in various fields because of its high energy storage density, stable chemical structure and excellent temperature control characteristics. For example, solar energy storage, smart thermal insulation textiles, Thermal protection of electronic devices, waste heat recovery, etc. Solid-liquid phase change materials have become the most feasible and practical phase change materials that are currently unanimously considered by scientific researchers due to their high heat storage dens...

Claims

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Application Information

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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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