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Mesoporous material-based composite phase change heat storage material and preparation method thereof

A technology of composite phase change materials and mesoporous materials, applied in the field of shape-setting phase change heat storage materials, can solve the problems of low content of phase change materials, low latent heat utilization efficiency, low overall latent heat of phase change, etc. The effect of high utilization rate and low cost of latent heat of phase transition and latent heat

Inactive Publication Date: 2010-08-25
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the carrier substrates used to prepare composite phase-change materials include: gypsum, cement, concrete, and reticular pore-shaped structure containing a large number of micropores, but all have a low content of phase-change materials (less than 50wt%) ), the overall latent heat of phase change is not high, and the latent heat utilization efficiency is low.

Method used

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  • Mesoporous material-based composite phase change heat storage material and preparation method thereof
  • Mesoporous material-based composite phase change heat storage material and preparation method thereof
  • Mesoporous material-based composite phase change heat storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Dissolve 4g of polyethylene glycol (PEG, molecular weight 1500) in 40ml of absolute ethanol, under vigorous stirring, add 1g of SBA-15 mesoporous silicon molecular sieve or MCM-41 mesoporous silicon molecular sieve or active carbon ( AC), stirred at room temperature for 1.0 h, mixed evenly and dried at 80°C for 3 days.

[0039]Implementation results: as shown in Figure 1, different mesoporous material-based composite phase change thermal storage materials have the same crystal phase as the organic phase change material (PEG); Figure 2 is the DSC curve of the composite phase change thermal storage materials, different The phase transition temperature of the mesoporous material-based composite phase change heat storage material is obviously lower than that of the pure organic phase change material PEG. As shown in Table 1, when the content of organic phase change materials in different mesoporous material-based composite phase change heat storage materials is 80wt%, the p...

Embodiment 2

[0043] Dissolve a certain amount of polyethylene glycol (PEG, molecular weight 1500) in absolute ethanol, under strong stirring, add a certain amount of activated carbon (AC) to the above solution, stir at room temperature, mix well and dry at 80°C for 3 sky.

[0044] Table 2: the consumption of raw material in embodiment 2

[0045] PEG1500 content

(wt%)

Absolute ethanol

(ml)

PEG1500(g)

AC(g)

Stirring time (h)

30

15

1.5

3.5

3.5

40

20

2.0

3.0

3.0

50

25

2.5

2.5

2.5

60

30

3.0

2.0

2.0

70

35

3.5

1.5

1.5

[0046] Implementation results: as shown in Figure 3, the composite phase change heat storage materials with different PEG contents have the same crystal phase as the organic phase change material (PEG) therein; Figure 4 is the DSC of the composite phase change heat storage materials with different P...

Embodiment 3

[0050] Dissolve 3.5g of polyethylene glycol (PEG, molecular weight 1500, 4000, 6000, 10000) in 35ml of absolute ethanol, under vigorous stirring, add 1.5g of activated carbon (AC) to the above solution, and stir at room temperature for 1.5 h, after mixing evenly, dry at 80°C for 3 days.

[0051] Implementation results: as shown in Figure 5, the composite phase change heat storage materials with different PEG molecular weights have the same crystal phase as the organic phase change material (PEG) therein; Figure 6 is the DSC of the composite phase change heat storage materials with different PEG molecular weights The curve shows that the phase transition temperature of the composite phase change thermal storage materials with different PEG molecular weights is obviously lower than that of the pure organic phase change material PEG with the corresponding molecular weight. As shown in Table 4, the phase transition temperature of the PEG / AC composite phase change heat storage mate...

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Abstract

The invention discloses a mesoporous material-based composite phase change heat storage material and a preparation method thereof. The composite phase change heat storage material, which can still keep fixed shape even at the temperature higher than the melting point of phase change substance by 30 DEG C, is prepared by using mesoporous material as carrier matrix and organic substance as phase change substance according to methods of physical blending and impregnation. Compared with other technologies, reported in documents, for the preparation of shape-fixed composite phase change material, the preparation technology has the characteristics of great simplicity and saving time, and the prepared composite phase change heat storage material has high content of the phase change material, high latent heat of phase change and utilization rate of the latent heat, and obviously lowered phase change temperature.

Description

technical field [0001] The invention relates to a composite phase-change thermal storage material, in particular to a fixed-shape phase-change thermal storage material composed of an organic phase-change substance and a carrier matrix. Background technique [0002] The energy crisis and environmental pollution have aroused people's high attention to the research of phase change energy storage materials. Phase change materials (Phase change materials, PCM) have unique latent heat properties. During the phase change process, they can absorb heat from the environment or release heat to the environment. Heat, so as to achieve the purpose of heat storage and release. Therefore, it is widely used in the field of thermal energy storage (such as power peak shaving, solar and thermal energy storage, air-conditioning cold storage, industrial waste heat utilization), temperature control fields (such as aerospace instruments, constant temperature textiles, temperature-regulated building...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 冯利利李星国郑捷赵威杨容李伟
Owner PEKING UNIV
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