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Three-dimensional graphene heat-conducting phase-change composite of arbitrary shape and preparation method thereof

A phase-change composite material and a phase-change material technology, which are applied in the field of three-dimensional graphene thermally conductive phase-change composite materials of any shape and their preparation, can solve the problems of complex processing process, complicated process, and difficult to realize, and achieve broad application prospects and high performance. Effect of cycle stability and high latent heat of phase transition

Inactive Publication Date: 2018-02-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for graphene assemblies with complex shapes, a very complicated processing process is required, the process is complicated, the cost is high, and it is even difficult to realize.

Method used

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  • Three-dimensional graphene heat-conducting phase-change composite of arbitrary shape and preparation method thereof
  • Three-dimensional graphene heat-conducting phase-change composite of arbitrary shape and preparation method thereof
  • Three-dimensional graphene heat-conducting phase-change composite of arbitrary shape and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] After the graphite is oxidized, it is stripped into the water system by ultrasonic dispersion, and the graphene oxide aqueous dispersion is stirred and heated at 60°C to be concentrated to 50mg / ml (such as figure 1 As shown in figure 2 As shown), after freezing in a refrigerator, the water is removed by a freeze dryer to obtain a porous graphene oxide aerogel. After treatment at 2800°C for 2 hours, a high-quality graphene aerogel is obtained with a density of 22 mg / cm. 3 , Porosity 99.1% (such as image 3 Shown), filled with stearyl alcohol by vacuum assisted casting method, the thermal conductivity of the thermally conductive phase change composite material is 3.0 W / (mK), the latent heat of phase change is 302.7 J / g, and the thermal conductivity of the composite material is 0.23 compared to the pure phase change material W / (mK) increased by 12 times, and the latent heat of phase change retained 98.9%. After many cycles, the DSC curve has a high degree of overlap (such as...

Embodiment 2

[0033] After the graphite is oxidized, it is stripped into the tert-butanol system by ultrasonic dispersion. The graphene oxide tert-butanol dispersion is concentrated to 60 mg / ml by centrifugation, hand-kneaded into a cylindrical shape, frozen in the refrigerator, and then the water is removed by a freeze dryer. , Obtain porous graphene oxide aerogel, treat at 2800℃ for 2h, obtain high-quality graphene aerogel, density 28 mg / cm 3 , The porosity is 98.7%, filled with stearyl alcohol by vacuum assisted casting, the thermal conductivity of the thermally conductive phase change composite material is 3.5W / (mK), the latent heat of phase change is 298.1 J / g, the composite material is more thermally conductive than pure phase change material The rate of 0.23 W / (mK) is increased by 14 times, and the latent heat of phase change is retained by 97.4%. After multiple cycles, the DSC curve has a high degree of overlap. When heated to above the phase transition temperature, there is no liquid...

Embodiment 3

[0035] After the graphite is oxidized, it is stripped into the water system by ultrasonic dispersion. The graphene oxide aqueous dispersion is stirred and heated at 80°C to be concentrated to 110 mg / ml, hand kneaded into a cylindrical shape, frozen by liquid nitrogen, and then removed by a freeze dryer. , Obtain porous graphene oxide aerogel, treat at 2800℃ for 2h, obtain high-quality graphene aerogel, density 42 mg / cm 3 , Porosity is 98.2%, filled with stearyl alcohol by vacuum assisted casting method, the thermal conductivity of the thermally conductive phase change composite material is 5.0 W / (mK), the latent heat of phase change is 289.0 J / g, the composite material is more thermally conductive than pure phase change material The rate of 0.23 W / (mK) is increased by 20.8 times, and the latent heat of phase change is retained by 94.4%. After multiple cycles, the DSC curve has a high degree of coincidence, heating to above the phase transition temperature, no liquid oozes out, a...

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Abstract

The invention relates to a three-dimensional graphene heat-conducting phase-change composite of an arbitrary shape and a preparation method thereof. According to the invention, a three-dimensional structure of any shape is prepared from high-viscosity graphene oxide slurry and then subjected to freeze-drying to prepare a graphene oxide aerogel; then high-temperature treatment is carried out so asto prepare a high-quality three-dimensional graphene aerogel; and then an aerogel system is filled with a phase-change material so as to obtain the heat-conducting phase-change composite with excellent thermal conductivity, high phase-change latent heat, high dimensional stability and cycling stability; and the thermal conductivity of the composite is 2-11 W / (mK), and the phase-change latent heatof the composite is more than 95% of the inherent value of the phase-change material.

Description

Technical field [0001] The invention belongs to the technical field of graphene preparation, and particularly relates to a three-dimensional graphene thermally conductive phase change composite material of any shape and a preparation method thereof. Background technique [0002] Phase change energy storage materials (PCMs) refer to a class of materials that can store and release heat through a phase change process at a certain temperature. They have good applications in the fields of latent heat storage, heat dissipation, induction and detection. Among them, organic phase change materials have the advantages of high latent heat of phase change, non-toxicity, non-corrosion, etc., and are very promising as an efficient thermal management material for use in the construction field or for heat transfer and heat dissipation of electronic devices. However, low thermal conductivity and poor dimensional stability are the main shortcomings that limit its wide application. Therefore, for ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 于中振杨静李晓锋安飞闵芃
Owner BEIJING UNIV OF CHEM TECH
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