Graphene elastic polymer phase-change composite material and preparation method thereof

A phase change composite material, elastic polymer technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of affecting the repeated use characteristics of materials, unstable composite materials, and decreased modification effect, and achieve the preparation cost. Low cost, obvious thermal conductivity, improved thermal conductivity

Active Publication Date: 2019-02-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the intrinsic thermal conductivity of graphene is high, the thermal conductivity modification effect of graphene as a thermal conductive filler is better than that of ordinary thermal conductive fillers, but this kind of composite material obtained by mechanical blending is extremely unstable in the process of repeated use, and will gradually settle. Delamination phenomenon, the modification effect will gradually decrease, which affects the repeated use characteristics of the material

Method used

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  • Graphene elastic polymer phase-change composite material and preparation method thereof
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  • Graphene elastic polymer phase-change composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Dissolve graphite oxide in water, stir for 15 minutes, ultrasonicate for 1 hour, and configure graphene oxide solutions with different concentrations: the concentration is 5mg / ml, 3mg / ml;

[0037] (2) Take 60ml of 5mg / ml graphene oxide solution, put it in a 100ml reactor for hydrothermal reaction for 15h, and the hydrothermal temperature is 180°C to obtain graphene hydrogel, freeze-dry in a vacuum dryer for 24h, Less than 2Pa, the freezing temperature is -60°C, and graphene airgel is obtained.

[0038] (3) Take 100ml of a 3mg / ml graphene oxide solution, mix it with 20g of molten paraffin, stir at 80°C for 45min at a stirring rate of 10000r / min, wash it with deionized water after cooling, and dry it on filter paper at room temperature to obtain a phase transition microsphere. capsule.

[0039] (3) Use a styrene-acrylic emulsion with a solid content of 50%. The phase change microcapsules and the elastic polymer are mixed and stirred evenly at a mass ratio of 1:1, and ...

Embodiment 2

[0042] (1) Dissolve graphite oxide in water, stir for 15 minutes, ultrasonicate for 1 hour, and configure graphene oxide solutions with different concentrations: the concentrations are 7mg / ml and 2mg / ml;

[0043] (2) Take 60ml of 7mg / ml graphene oxide solution, put it in a 100ml reactor for hydrothermal reaction for 15h, and the hydrothermal temperature is 180°C to obtain graphene hydrogel, freeze-dry in a vacuum dryer for 24h, Less than 2Pa, the freezing temperature is -60°C, and graphene airgel is obtained.

[0044] (3) Take 100ml of 2mg / ml graphene oxide solution, mix it with 20g of molten paraffin, stir at 80°C for 45min at a stirring rate of 10000r / min, wash it with deionized water after cooling, and dry it on filter paper at room temperature to obtain a phase transition microstructure. capsule.

[0045] (4) Use a styrene-acrylic emulsion with a solid content of 50%. The phase change microcapsules and the elastic polymer are mixed and stirred evenly at a mass ratio of 1...

Embodiment 3

[0048] (1) Dissolve graphite oxide in water, stir for 15 minutes, ultrasonicate for 1 hour, and prepare graphene oxide solutions with different concentrations: the concentrations are 4mg / ml and 2mg / ml;

[0049] (2) Take 60ml of 4mg / ml graphene oxide solution, put it in a 100ml reactor for hydrothermal reaction for 15h, and the hydrothermal temperature is 180°C to obtain graphene hydrogel, freeze-dry in a vacuum dryer for 24h, Less than 2Pa, the freezing temperature is -60°C, and graphene airgel is obtained.

[0050] (3) Take 100ml of 2mg / ml graphene oxide solution, mix it with 20g of molten paraffin, stir at 80°C for 45min at a stirring rate of 10000r / min, wash it with deionized water after cooling, and dry it on filter paper at room temperature to obtain a phase transition microstructure. capsule.

[0051] (4) Use a styrene-acrylic emulsion with a solid content of 50%. The phase change microcapsules and the elastic polymer are mixed and stirred evenly at a mass ratio of 1:1...

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Abstract

The invention relates to a graphene elastic polymer phase-change composite material and a preparation method thereof. Firstly, a graphene aerogel is obtained through a hydrothermal reduction, then a graphene oxide solution is mixed with a phase-change material, phase-change microcapsules are prepared through a Pickering emulsion method, and finally, the phase-change microcapsules in certain proportions and an elastic polymer emulsion mixed solution are compounded with the graphene aerogel through vacuum impregnation, and subjected to vacuum freeze-drying to obtain the graphene elastic polymerphase-change composite material. Compared with the prior art, the graphene aerogel is taken as a skeleton to provide thermal conductive modification for the composite material, and a packaging environment is provided for the phase-change material through a complicated pore structure, therefore, two technical bottlenecks of high leakage possibility and poor thermal conductivity of the phase-changecomposite material can be effectively solved; an elastic polymer is compounded to reinforce the graphene skeleton, and is capable of providing excellent mechanical properties for the composite material while further packaging the phase-change material, and then energy storage application can be realized under special conditions.

Description

technical field [0001] The invention relates to the technical field of graphene nanocomposite materials, in particular to a graphene elastic polymer phase change composite material and a preparation method thereof. Background technique [0002] Nowadays, with the rapid development of industrial civilization, problems such as shortage of traditional fossil energy and environmental pollution follow. The development and utilization of renewable energy has become the key to the sustainable development of society. Due to the inherent energy of renewable energy The characteristics of uneven and uncertain distribution often require an energy storage link in the energy conversion system, so as to solve the mismatch problem of energy utilization in time and space and improve the utilization rate of energy. Phase change materials can store and release energy by using the phase transition process, which is an ideal energy storage medium, so it has attracted the attention of researchers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张东曹流
Owner TONGJI UNIV
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