Preparation method of phase change composite material with high phase change enthalpy

A phase-change composite material and composite material technology, applied in the field of energy storage material synthesis, can solve problems such as the reduction of crystallization rate, hindering the thermal movement of PEG molecules, and the reduction of phase change enthalpy, so as to improve crystallization behavior, improve thermal rheological behavior and Effect of crystallization behavior and stability improvement

Inactive Publication Date: 2018-06-29
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogen bond (H-O) formed by the interaction between the silicon hydroxyl group on the surface of mesoporous silica and the oxygen atom in the PEG molecule hinders the thermal movement of the PEG molecule, resulting in a decrease in the crystallization rate and a decrease in the phase change enthalpy during the phase transition process.

Method used

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  • Preparation method of phase change composite material with high phase change enthalpy
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Embodiment 1

[0022] A method for preparing a phase change composite material with a high phase change enthalpy includes the following steps:

[0023] (1) Synthesis of nano flower-like mesoporous silicone:

[0024] At room temperature, 1.25 g of cetyltrimethylammonium bromide (CTAB), 1.25 g of n-butanol and 5 g of cyclohexane were added to 100 g of 0.4M urea aqueous solution and stirred for 30 minutes. After thorough stirring, 0.875 g of ethyl orthosilicate and 0.375 g of 1,2-bis(triethoxysilyl)ethane (BTSE) were added dropwise. Then the mixture was fully stirred at room temperature for 30 minutes, and then the mixture was stirred and reacted at 70 degrees Celsius for 24 hours, centrifuged and washed with ethanol and water to obtain nano flower-like silicone without removing the template. Place the nano flower-like silicone of the agent in 250 ml of acetone, heat and reflux at 80 degrees Celsius for 48 hours to remove the template, then fully clean with ethanol and dry at room temperature for 1...

Embodiment 2

[0029] A method for preparing a phase change composite material with a high phase change enthalpy includes the following steps:

[0030] (1) Synthesis of nano flower-like mesoporous silicone:

[0031] At room temperature, 0.5 g of cetyltrimethylammonium bromide (CTAB), 0.5 g of n-butanol and 3 g of cyclohexane were added to 80 g of 0.6 M urea aqueous solution and stirred for 30 minutes. After thorough stirring, 0.5 g of ethyl orthosilicate and 0.1 g of 1,2-bis(triethoxysilyl)ethane (BTSE) were added dropwise. Then the mixture was fully stirred at room temperature for 30 minutes, and then the above mixture was stirred and reacted at 60 degrees Celsius for 12 hours, centrifuged and rinsed with ethanol and water to obtain nano flower-like silicone without removing the template. Place the nano-flower-like silicone of the agent in 200ml of acetone, heat and reflux at 80 degrees Celsius for 48 hours to remove the template, then fully clean it with ethanol and dry it at room temperature ...

Embodiment 3

[0036] A method for preparing a phase change composite material with a high phase change enthalpy includes the following steps:

[0037] (1) Synthesis of nano flower-like mesoporous silicone:

[0038] At room temperature, 2g of cetyltrimethylammonium bromide (CTAB), 2g of n-butanol and 6g of cyclohexane were added to 150g of 0.6M urea aqueous solution and stirred for 30 minutes. After thorough stirring, 1.6 g of ethyl orthosilicate and 0.6 g of 1,2-bis(triethoxysilyl)ethane (BTSE) were added dropwise. Then the mixture was fully stirred at room temperature for 30 minutes, and then the above-mentioned mixture was continuously stirred and reacted at 80 degrees Celsius for 48 hours, centrifuged and washed with ethanol and water to obtain nano flower-like silicone without removing the template. The nano flower-like silicone of the agent is placed in 300 ml of acetone, heated to reflux at 80 degrees Celsius for 48 hours to remove the template agent, and then fully cleaned with ethanol a...

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Abstract

The invention discloses a preparation method of a phase change composite material with a high phase change enthalpy. The preparation method comprises the following steps: (1) synthesizing nano-flower-shaped mesoporous organic silicon; and (2) preparing shape-stabilized the phase change composite material by taking the nano-flower-shaped mesoporous organic silicon as a carrier. The preparation method disclosed by the invention has the advantages that the nano-flower-shaped mesoporous organic silicon is taken as the carrier for fixing PEG (polyethylene glycol) to prepare the shape-stabilizedphase change composite material, so that the crystallization behavior of PEG molecules is improved, and the phase change enthalpy of the shape-stabilized phase change composite material is increased; the PEG modified by GO forms a cross-linked network, so that the stability of the phase change composite material is increased; and interior of the network of the PEG is filled with the GO to form afilled structure, so that the thermorheological behavior and the crystallization behavior of the phase change composite material are effectively improved.

Description

Technical field [0001] The invention relates to the field of energy storage material synthesis, in particular to a method for preparing a phase change composite material with high phase change enthalpy. Background technique [0002] Phase change composite materials (PCMs) are one of the most promising energy storage carriers at present because of their high energy storage density, stable output temperature and heat, and a wide range of phase transition temperatures. They are widely used in building energy conservation, solar light Thermal system, industrial waste heat utilization, electronic device heat dissipation, air conditioning system and phase change temperature control daily necessities and other fields. According to the chemical composition of PCMs, they are divided into organic and inorganic categories. Among them, the organic phase change composite material has the advantages of low price, good chemical and thermal stability, no overcooling and phase separation, less c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 陈妍施骞高军凯陶雯雯
Owner ZHEJIANG OCEAN UNIV
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