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A shape-setting composite phase change energy storage material and its preparation method

A technology of energy storage material and composite phase transition, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of reducing the crystallization performance of lower glycol, lowering the crystallinity of polyethylene glycol, lowering the latent heat of phase change and so on. , to achieve the effect of stable phase change cycle, high latent heat of phase change, and stable shape

Active Publication Date: 2016-02-10
重庆中防德邦防水技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of calcium chloride accelerator or coagulant to silica sol will reduce the crystallization performance of norethylene glycol, and even form a complex structure, which will greatly reduce the crystallinity of polyethylene glycol, resulting in latent heat of phase change Decrease (for references, see Liu Shaohua et al., Study on the Interaction of Polyethylene Glycol and Calcium Ions, Journal of Biomedical Engineering, 1990, 7 (4); Zhuang Jinshu, Characterization of Polyethylene Glycol and Calcium Chloride Complexes, Fujian Normal University University Journal (Natural Science Edition) 1991, 7 (2))
Patent CN101942290A "Preparation method and product of polyethylene glycol / silicon dioxide composite phase-change energy storage material" mentions the use of polysilicon by-product SiCl 4 Hydrolysis and sol-gel in polyethylene glycol aqueous solution to obtain composite shape-changing phase-change energy storage materials, and hydrogen chloride needs to be removed in the subsequent process, the process is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A shape-setting composite phase-change energy storage material, which is prepared from silica sol with a mass concentration of 30% (pH value is 10.0), polyethylene glycol 2000, and silane coupling agent KH-570. The mass ratio of each raw material is Silica sol: polyethylene glycol 2000: KH-570=100: 120: 1.5.

[0019] Polyethylene glycol 2000 has a phase transition temperature of 45°C and a latent heat of phase transition of 188.1J / g. The thermal characteristic parameters of the present invention all adopt the Netzsch comprehensive thermal analyzer STA449C, the same below.

[0020] The preparation method of the above-mentioned shaped composite phase change energy storage material, it comprises the following steps:

[0021] 1) Add polyethylene glycol 2000 to 30% silica sol to disperse it. The mass ratio of silica sol to polyethylene glycol 2000 is 100:120; Stir vigorously under the conditions to make it undergo gelation reaction, and form a three-dimensional network str...

Embodiment 2

[0026] A shape-setting composite phase-change energy storage material, which is prepared from silica sol with a mass concentration of 25% (pH value is 10.5), polyethylene glycol 2000, and silane coupling agent KH-570. The mass ratio of each raw material is Silica sol: polyethylene glycol 2000: KH-570=100: 60: 0.85.

[0027] Polyethylene glycol 2000 has a phase transition temperature of 45°C and a latent heat of phase transition of 188.1J / g.

[0028] The preparation method of the above-mentioned shaped composite phase change energy storage material, it comprises the following steps:

[0029] 1) Add polyethylene glycol 2000 to the silica sol to disperse it. The mass ratio of silica sol to polyethylene glycol 2000 is 100:60; Stir to make it undergo gelation reaction, and form a three-dimensional network structure PEG2000 / SiO after standing still 2 gel;

[0030] 2) PEG2000 / SiO 2 The gel was air-dried in an oven at 85°C for 24 hours; cooled to room temperature, and ground into ...

Embodiment 3

[0034] A shape-setting composite phase-change energy storage material, which is prepared from silica sol with a mass concentration of 30% (pH value is 9.5), polyethylene glycol 4000, and silane coupling agent KH-570. The mass ratio of each raw material is Silica sol: polyethylene glycol 4000: KH-570=100:70:0.8.

[0035] Polyethylene glycol 4000 has a phase transition temperature of 47°C and a latent heat of phase transition of 219.5 J / g.

[0036] The preparation method of the above-mentioned shaped composite phase change energy storage material, it comprises the following steps:

[0037] 1) Add polyethylene glycol 4000 to the silica sol to disperse it. The mass ratio of silica sol to polyethylene glycol 4000 is 100:70; Stir to make it undergo gelation reaction, and form a three-dimensional network structure PEG4000 / SiO after standing still 2 gel;

[0038] 2) PEG4000 / SiO 2 The gel was air-dried in an oven at 85°C for 24 hours; cooled to room temperature, and ground into powde...

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Abstract

The invention provides a shape-stabilized composite phase change material for energy storage and a preparation method thereof. The method comprises: uniformly dispersing an organic solid-liquid phase change material in silica sol by utilizing dispersibility of the organic solid-liquid phase change material in silica sol, and gelating under proper temperature and stirring condition, thereby absorbing the organic solid-liquid phase change material in a micropore structure of silica gel. Under action of capillary force and surface tension, the organic solid-liquid phase change material is firmly fixed by silica micropores when generating solid-liquid phase change without seepage, and maintains stable shape. The shape-stabilized composite phase change material for energy storage is obtained through surface hydrophobic treatment after ground to powder. The shape-stabilized composite phase change material for energy storage provided by the method has advantages of non leakage at high temperature (200 DEG C), stable shape and high phase change latent heat.

Description

technical field [0001] The invention relates to a shape-setting composite technology of an organic solid-liquid phase change material, and provides a shape-setting composite phase change material and a preparation method thereof. The shape-setting composite phase change material can be applied in various energy storage technical fields. Background technique [0002] In today's increasingly tense energy supply, phase-change energy storage technology has attracted widespread attention due to its high energy storage density and stable output temperature and energy, and its application fields are becoming more and more extensive, such as solar energy utilization and power peak regulation. , waste heat utilization, cross-season heat storage and cold storage, food preservation, building insulation, thermal protection of electronic devices, textile and clothing, agriculture, etc. [0003] Phase change energy storage is the use of phase change materials to absorb or release a large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 何丽红朱洪洲唐伯明刘唐志肖巧林李菁若陈晨
Owner 重庆中防德邦防水技术有限公司
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