Energy-saving type three dimensional graphene skeleton composite phase change material with heat storage and release performances, and preparation method thereof

A composite phase change material, graphene skeleton technology, applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of easy aging, easy leakage, low thermal conductivity, etc., to achieve good plasticity, prevent leakage, improve thermal conductivity, etc. guiding effect

Active Publication Date: 2015-12-02
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
6 Cites 17 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, its own shortcomings such as easy leakage, high packaging requirements, and easy aging limit its application in the field of heat dissipation of electronic devices.
On the other hand, low thermal conductivity is another technical bottleneck that limits the large-scale application of organic phase change heat storage materials.
Therefore, combining the advantages of th...
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Abstract

The invention discloses an energy-saving type three dimensional graphene skeleton composite phase change material with heat storage and release performances, and a preparation method thereof. The phase energy-saving type three dimensional graphene skeleton composite phase change material is obtained through self-assembling graphen in an organic phase change material in a three dimensional skeleton interconnection form, and comprises 5-95 mass% of the organic phase change material, and the balance of graphene. The graphene composite phase change material can effectively solve the leakage problem of the organic phase change material, the three dimensional skeleton network distributed graphene greatly improves the heat conductivity of the phase change material, and provides a rapid transmission channel for heat energy collection and storage and later heat energy use; the preparation method has the advantages of simple operation, low cost and easy popularization; and the heat storage ability and the phase change temperature of the graphene composite phase change material prepared through the method depend on different selected phase change materials to meet different application channels, so wide prospect is provided for future application of the material.

Application Domain

Heat-exchange elements

Technology Topic

Composite phase change materialGraphene +8

Image

  • Energy-saving type three dimensional graphene skeleton composite phase change material with heat storage and release performances, and preparation method thereof
  • Energy-saving type three dimensional graphene skeleton composite phase change material with heat storage and release performances, and preparation method thereof
  • Energy-saving type three dimensional graphene skeleton composite phase change material with heat storage and release performances, and preparation method thereof

Examples

  • Experimental program(7)

Example Embodiment

[0034] Example 1:
[0035] In this embodiment, the energy-saving three-dimensional graphene skeleton composite phase change material with heat storage and exothermic properties is obtained by self-assembly of graphene and organic phase change material PEG2000, wherein the mass of organic phase change material PEG6000 is 9.5g, graphite The mass of alkene was 0.5 g.
[0036] In the present embodiment, the energy-saving three-dimensional graphene skeleton composite phase change material with heat storage and heat release properties is prepared by the following method:
[0037] Place 1.2g graphite in 60mL concentrated sulfuric acid with a mass concentration of 98%, 2gK 2 S 2 O 8 and 2gP 2 O 5 In the mixed solution, react at 85 °C for 4.5 hours, after the reaction, dilute the reaction solution with 400 mL of deionized water, and sequentially filter, wash and vacuum dry at 60 °C to obtain pretreated graphite-graphite oxide;
[0038] To 100 mg of graphite oxide, add 50 mL of 98% concentrated sulfuric acid and 2 g of KMnO 4 , react at 35°C for 2 hours, then add 80mL of deionized water to the reaction solution, continue to react at 95°C for 0.5 hours, then add 120mL of deionized water and 6mL of hydrogen peroxide solution with a mass concentration of 30% to terminate the reaction, followed by centrifugation, Graphene oxide is obtained after washing and vacuum drying at 30-40°C; washing is successively washed with HCl solution with a mass concentration of 10% and deionization;
[0039] 100 mg of graphene oxide obtained above was ultrasonically dispersed in 100 mL of deionized water, then 0.1 g of L-AA was added, and magnetically stirred for 24 hours at room temperature to obtain graphene with good dispersibility.
[0040] The solid polyethylene glycol 2000 of 9.5g is heated and melted into a liquid state, then a preheated solution containing 0.5g of graphene with water as a solvent is added under agitation, and is heated (heated to not less than polyethylene glycol). The phase transition temperature of diol 2000 to ensure that polyethylene glycol 2000 remains liquid) after stirring for 5 hours, stand for 5 hours without changing the temperature, and then dry at room temperature to obtain heat storage and exothermic properties Energy-saving three-dimensional graphene framework composite phase change material.
[0041] figure 1 Optical photos of three-dimensional graphene framework composite phase change materials with different shapes and thicknesses obtained through different molds. figure 2 Scanning electron microscope images under different magnifications of the three-dimensional graphene skeleton composite phase change material obtained in this example, from figure 2 It can be seen that graphene is self-assembled in the organic phase change material in a 3D network-like structure.

Example Embodiment

[0042] Example 2:
[0043] The preparation method of this example is the same as that of Example 1, the difference is that the addition amount of the organic phase change material PEG6000 is 3g and 1.5g respectively.
[0044] After testing, when PEG6000 is used as the organic phase change material in Examples 1 and 2, the endothermic heat storage temperature of the obtained three-dimensional graphene skeleton composite phase change material is about 62-64°C.
[0045] image 3 For the XRD patterns of the three-dimensional graphene skeleton composite phase change materials with different PEG6000 mass percentages obtained in Example 1 and Example 2, and the XRD patterns of pure PEG6000 and graphene, it can be seen from the XRD patterns of graphene The diffraction peak at 20.9° is a characteristic peak of the layered structure, so compared with the XRD patterns of pure PEG6000 and graphene, it can be seen that graphene does not have this characteristic peak in the phase change material, so it is confirmed that graphene is in the composite phase. Disordered, non-layered arrangements in variable materials.
[0046] Figure 4 In order to test the leakage prevention of the composite phase change material obtained in Example 1 and the original PEG6000, the left picture shows the three-dimensional graphene skeleton composite phase change material (the sample on the left in the left picture) and the original PEG6000 (the right side in the left picture) at room temperature. sample), the right picture shows the three-dimensional graphene framework composite phase change material and pristine PEG6000 when the temperature is higher than the phase change temperature of the phase change material. It can be seen that when the temperature is higher than the phase change temperature of the phase change material (75°C), the three-dimensional graphene skeleton composite phase change material does not have any change, but the original organic phase change material PEG6000 has become liquid.
[0047] Figure 5 The DSC diagrams (A: 95%, B: 86%, C: 75%, D : 100%), as can be seen from the figure, the energy-saving three-dimensional graphene skeleton composite phase change material of the present invention has good endothermic and exothermic properties, and has high utilization value.

Example Embodiment

[0048] Example 3:
[0049] The preparation method of this example is the same as that of Example 1, except that the organic phase change material is PEG2000, and the addition amounts are 9.5g, 3g and 1.5g respectively.
[0050] After testing, when PEG2000 is used as the organic phase change material in this example, the endothermic heat storage temperature of the obtained three-dimensional graphene skeleton composite phase change material is about 41-46°C.
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Description & Claims & Application Information

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