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High-stability solid-solid composite phase change material and preparation method thereof

A composite phase change material and high stability technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of easy leakage of molten state, low heat storage/release rate, etc., and achieve easy access to raw materials and simple operation , high stability effect

Active Publication Date: 2021-01-15
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a solid-solid composite phase change material with high stability, to solve the problems that polyethylene glycol is used as a solid-liquid phase change material, and its molten state is easy to leak and the heat storage / release rate is low.

Method used

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  • High-stability solid-solid composite phase change material and preparation method thereof
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  • High-stability solid-solid composite phase change material and preparation method thereof

Examples

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Embodiment 1

[0045] The high stability solid-solid composite phase change material described in this example was prepared according to the following formula and steps.

[0046] Step 1, preparation of double-terminal aldehyde group polyethylene glycol aqueous solution:

[0047] The preparation mechanism is as figure 1 As shown, the specific operation process is as follows:

[0048]2.50mmol of polyethylene glycol with a molar mass of 600, 6.00mmol of p-formylbenzoic acid, 7.50mmol of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 7.50mmol of pyridine Dissolved in 250ml of dichloromethane successively, stirred at room temperature for 48 hours, removed the dichloromethane by rotary evaporation, washed 5 times with glacial ether, and vacuum-dried at 25°C for 12 hours to obtain double-terminal aldehyde polyethylene glycol ; Dissolve double-ended aldehyde-based polyethylene glycol into deionized water to make 60wt% double-ended aldehyde-based polyethylene glycol aqueous solutio...

Embodiment 2

[0056] Step 1, preparation of double-terminal aldehyde group polyethylene glycol aqueous solution:

[0057] 2.50mmol of polyethylene glycol with a molar mass of 2000, 7.50mmol p-formylbenzoic acid, 7.50mmol1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 7.50mmol pyridine Dissolved in 250ml of dichloromethane successively, stirred at room temperature for 48 hours, removed the dichloromethane by rotary evaporation, washed 5 times with glacial ether, and vacuum-dried at 25°C for 12 hours to obtain double-terminal aldehyde polyethylene glycol ; Dissolve double-ended aldehyde-based polyethylene glycol into deionized water to make 50wt% double-ended aldehyde-based polyethylene glycol aqueous solution for subsequent use.

[0058] Step 2, prepare chitosan solution:

[0059] Weigh 1.2g of chitosan and dissolve it into a mixed solution containing 99.5ml of deionized water and 0.5ml of acetic acid to prepare a chitosan solution for subsequent use.

[0060] Step 3, addit...

Embodiment 3

[0066] Step 1, preparation of double-terminal aldehyde group polyethylene glycol aqueous solution:

[0067] 2.50mmol of polyethylene glycol with a molar mass of 4000, 10.00mmol p-formylbenzoic acid, 7.50mmol1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 7.50mmol pyridine Dissolved in 250ml of dichloromethane successively, stirred at room temperature for 48 hours, removed the dichloromethane by rotary evaporation, washed 5 times with glacial ether, and vacuum-dried at 25°C for 12 hours to obtain double-terminal aldehyde polyethylene glycol ; Dissolve double-ended aldehyde-based polyethylene glycol into deionized water to make 40wt% double-ended aldehyde-based polyethylene glycol aqueous solution for subsequent use.

[0068] Step 2, prepare chitosan solution:

[0069] Weigh 0.35g of chitosan and dissolve it into a solution containing 99.5ml and 0.5ml of acetic acid to prepare a chitosan solution for subsequent use.

[0070] Step 3, addition of inorganic framew...

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Abstract

The invention discloses a high-stability solid-solid composite phase change material and a preparation method thereof, which belong to the technical field of phase change energy storage materials, andaim to solve the problems that polyethylene glycol serving as a solid-liquid phase change material is easy to leak in a molten state, low in heat storage / release rate and difficult to popularize andapply. Raw materials for preparing the material comprise 10 ml of a modified polyethylene glycol solution, 10 ml of a chitosan solution and an inorganic framework material. The mass of the inorganic framework material is 0.5-10 times that of chitosan in 10 ml of chitosan solution. The method comprises the following steps of preparing a modified polyethylene glycol aqueous solution, preparing a chitosan solution, adding an inorganic framework material, mixing raw materials, and preparing the product, namely the high-stability solid-solid composite phase change material. The composite phase change material prepared by combining the formula with the method has a loose and porous three-dimensional network structure and has the characteristic of solid-solid phase change; the heat storage performance is excellent, and the latent heat can reach 149.6 J / g.

Description

technical field [0001] The invention belongs to the technical field of phase-change energy storage materials, and in particular relates to a high-stability solid-solid composite phase-change material and a preparation method thereof. Background technique [0002] Energy storage technology is one of the most effective ways to alleviate the mismatch between energy supply and demand and environmental pollution, and it can significantly improve the utilization rate of intermittent and unstable energy. Phase change energy storage technology uses phase change materials to store or release thermal energy. It has the advantages of high thermal energy storage density, easy operation and control of the system, and approximately constant temperature of the system during the phase change process. It is widely used in solar energy, construction, aerospace, and drug delivery. and other fields. [0003] According to the different types of phase change, phase change heat storage is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/02
CPCC09K5/02
Inventor 王花枝甄立平周博付怡琳杨永杰张默端小亚
Owner LANZHOU UNIVERSITY
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