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Composite phase-change heat storage material with ultrathin graphite sheet as shaping substrate and preparation method

A technology of composite phase change and heat storage material, applied in the field of heat storage material preparation, can solve the problems of complex graphene preparation process, high investment cost for mass production, lack of loading capacity, etc., and achieves good peeling effect, rapid heat storage and release. Hot, easy-to-operate effect

Inactive Publication Date: 2018-09-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that using raw ore flake graphite as a supporting matrix can effectively improve the thermal conductivity of the material but the loading capacity is lacking; using graphene as a supporting matrix, the composite material prepared has excellent heat storage performance, but the preparation process of graphene is complicated and the preparation cost is high , high investment cost for mass production

Method used

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  • Composite phase-change heat storage material with ultrathin graphite sheet as shaping substrate and preparation method
  • Composite phase-change heat storage material with ultrathin graphite sheet as shaping substrate and preparation method
  • Composite phase-change heat storage material with ultrathin graphite sheet as shaping substrate and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 6.0g of raw ore flake graphite, add it to 400ml of NMP solution to make a suspension, and add 3.0g of dispersant PVP; magnetically stir the suspension for 1 hour, and ultrasonically disperse it for 1 hour to make it evenly dispersed; place the uniformly dispersed suspension In the ultrasonic sanding equipment, the ultrasonic power is 600W, the sanding speed is 2250r.p.m, and the suspension is taken out after working for 2 hours; the suspension after ultrasonic sanding is placed in a supercritical reactor, and the supercritical temperature is 45°C. Pressure 16MPa filled with CO 2 , turn on the shear and work at a rate of 1000r.p.m for 2h, take it out, and obtain a suspension of mixed graphite flakes after stripping; centrifuge the suspension at a centrifugal rate of 3500r.p.m to obtain a precipitate and a supernatant, and wash the precipitate with water several times Freeze-drying to obtain ultra-thin graphite flake matrix material. Mix the obtained ultra-thin grap...

Embodiment 2

[0031] According to the same method and conditions as in the embodiment (but the suspension after stripping is centrifuged at a centrifugal rate of 3500r.p.m to obtain a precipitate and a supernatant, and the supernatant is then centrifuged at a centrifugal rate of 5000r.p.m, and the resulting precipitate is subjected to repeated centrifugation. washing with water and freeze-drying to obtain an ultra-thin graphite sheet matrix material), and preparing a composite phase-change heat storage material with the ultra-thin graphite sheet as a shaped matrix. Adopt atomic force microscope Veeco Multimode V to measure ultra-thin graphite flake thickness to be 3.4-3.8nm (see figure 2 ). The maximum loading capacity measured by the HTC-3 differential thermal recoupler is 63.12%; the thermal conductivity value obtained by the DRX-II-RW thermal conductivity tester is 1.74W m -1 K -1 ; Use TA instruments DSC Q2000 to test the heat storage behavior of heat storage materials (the latent h...

Embodiment 3

[0033] According to the same method and condition of the embodiment (but the suspension after stripping is centrifuged with a centrifugal speed of 3500r.p.m to obtain a precipitate and a supernatant, and the supernatant is centrifuged with a centrifugal speed of 5000r.p.m to obtain a supernatant. After the supernatant is centrifuged at a centrifugal rate of 8000r.p.m, the obtained precipitate is washed and freeze-dried multiple times to obtain an ultra-thin graphite sheet matrix material), and a composite phase change heat storage material with an ultra-thin graphite sheet as a shaped matrix is ​​prepared. The maximum loading capacity measured by the HTC-3 differential thermal recoupler is 72.9%; the thermal conductivity value obtained by the DRX-II-RW thermal conductivity tester is 1.44W m -1 K -1 ; Use TA instruments DSC Q2000 to test the heat storage behavior of heat storage materials (the latent heat of phase change is 137.4J g -1 ), the result is as Figure 4 Shown: One...

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Abstract

The invention discloses a composite phase-change heat storage material with an ultrathin graphite sheet as a shaping substrate and a preparation method. The composite phase-change heat storage material is prepared from 30-75wt% of a phase change material and 25-70wt% of an ultrathin graphite substrate material through compounding, and belongs to the technical field of heat storage material preparation. By adopting crystalline flake graphite as a raw material, an ultrasonic grinding method and a fluid shearing auxiliary super critical CO2 peeling method are adopted to peel off the ultrathin graphite sheet, the ultrathin graphite sheet is adopted as the shaping substrate for loading a stearic acid phase change material, and thus the heat storage material is prepared. An ultrathin graphite sheet support substrate of the material is green and efficient in peeling process, and the composite phase-change heat storage material is excellent in heat conductivity and large in heat storage capacity and has great application potential in the field of heat storage.

Description

technical field [0001] The invention belongs to the technical field of heat storage material preparation, and relates to a composite phase change heat storage material with an ultra-thin graphite sheet as a shaped matrix and a preparation method. Background technique [0002] The development and utilization of renewable energy such as solar energy is the most important part of the new energy application field. However, due to the influence of natural conditions and the development of human society, there are contradictions in the uneven distribution and inconsistent demand of renewable energy in time and region. As a kind of energy storage material with high latent heat value, phase change materials store and release a large amount of latent heat through the phase change process, which can effectively solve the coordination relationship between energy supply and demand, and the raw materials are easy to obtain, widely used, and environmentally friendly. hotspot. [0003] A...

Claims

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Application Information

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IPC IPC(8): C09K5/06C01B32/225
CPCC01B32/225C09K5/063Y02P20/54
Inventor 李传常谢宝珊陈荐
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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