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Graphene-based composite phase-change membrane and preparation method thereof

A compound phase change and graphene technology, applied in chemical instruments and methods, heat exchange materials, sustainable manufacturing/processing, etc.

Active Publication Date: 2016-07-06
杭州德烯科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the perfect combination of graphene film and paraffin to prepare excellent composite phase change materials becomes a challenge

Method used

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  • Graphene-based composite phase-change membrane and preparation method thereof
  • Graphene-based composite phase-change membrane and preparation method thereof
  • Graphene-based composite phase-change membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Extrude the graphene oxide aqueous solution with a concentration of 10mg / mL from a preparation device with a straight die at a continuous speed of 10m / min and then enter the coagulation solution (methanol, the temperature is 40°C), stay for 20 seconds, and solidify To form a graphene oxide gel film, the graphene oxide gel film was placed in a refrigerator at -18°C and in liquid nitrogen for sufficient freezing.

[0024] (2) Heating the frozen graphene oxide gel film to 800°C at a rate of 1°C / min in an inert gas atmosphere, and keeping it warm for 0.5h;

[0025] (3) Raise the temperature to 1300°C at a rate of 3°C / min in an inert gas atmosphere and keep it warm for 0.5h;

[0026] (4) Raise the temperature to 3000°C at a rate of 8°C / min in an inert gas atmosphere and keep it warm for 0.5h to obtain a graphene airgel film

[0027] Observation by scanning electron microscope found that the graphene airgel membrane (A) obtained after being fully frozen in a refrigerator...

Embodiment 2

[0032] (1) Extrude the graphene oxide aqueous solution with a concentration of 60mg / mL from the preparation device with a straight die at a continuous speed of 10m / min and then enter the coagulation solution (methanol, the temperature is 40°C), stay for 20 seconds, and solidify To form a graphene oxide gel film, the graphene oxide gel film was placed in liquid nitrogen and frozen for 3min, 5min, 15min, 30min, and 35min. The graphene oxide gel film (a, b, c, d, e) after freezing treatment was observed under the scanning electron microscope, the graphene oxide gel film a had more stacks and less holes; the graphene oxide gel film Membranes b, c, and d have uniform pores, and the degree of density increases in turn, and the structure of graphene oxide gel membrane e is damaged.

[0033] (2) Heating the frozen graphene oxide gel film to 800°C at a rate of 1°C / min in an inert gas atmosphere, and keeping it warm for 0.5h;

[0034] (3) Raise the temperature to 1300°C at a rate of 3°...

Embodiment 3

[0038] (1) Extrude the graphene oxide aqueous solution with a concentration of 1mg / mL from a preparation device with a straight die at a continuous speed of 10m / min and enter the coagulation solution (cyclohexanone, temperature 30°C) for 10 seconds , solidify into a graphene oxide gel film, and place the graphene oxide gel film in liquid nitrogen for 25 minutes.

[0039] (2) Heating the frozen graphene oxide gel film to 800°C at a rate of 1°C / min in an inert gas atmosphere, and keeping it warm for 0.5h;

[0040] (3) Raise the temperature to 1300°C at a rate of 3°C / min in an inert gas atmosphere and keep it warm for 0.5h;

[0041] (4) In an inert gas atmosphere, the temperature was raised to 3000°C at a rate of 8°C / min, and kept for 0.5h to obtain a graphene airgel film;

[0042] (5) Soak the airgel film obtained in step 4 in a dichloromethane solution of paraffin wax with a concentration of 10g / ml for 5h, and then dry it in a vacuum oven at 30°C to obtain a composite phase ch...

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Abstract

The invention relates to a graphene-based composite phase-change membrane and a preparation method thereof. The preparation method comprises the following steps: continuously and uniformly extruding a graphene oxide water solution with a certain concentration out of a preparation device with a slotted opening into a solidification solution, and quickly refrigerating in liquid nitrogen; and carrying out freeze-drying to obtain a graphene oxide aerogel membrane, sending the graphene oxide aerogel membrane into a high-temperature furnace, carrying out high temperature 1300-3000-DEG C heat treatment in an inert atmosphere, immersing the graphene oxide aerogel membrane in paraffin dichloromethane solutions with different concentrations, and sufficiently absorbing, thereby obtaining the composite phase-change membrane material. The graphene composite phase-change membrane material has excellent packaging effect on paraffin, and the paraffin loadability is 0.1-99.9%; the membrane and paraffin are compounded uniformly; and after repeated heating-cooling circulations, the melt phase-change enthalpy and solidifying phase-change enthalpy of the material are basically kept unchanged, thereby implementing high-efficiency heat energy storage.

Description

technical field [0001] The invention relates to the field of carbon composite phase change materials, in particular to a graphene-based composite phase change film and a preparation method thereof. Background technique [0002] Phase-change materials absorb or release heat energy through physical changes caused by temperature changes. Commonly used organic phase change materials have been widely used due to their stable performance, wide phase transition temperature, and adjustable temperature. However, organic phase change materials also have disadvantages such as poor thermal conductivity, large volume expansion coefficient, and easy leakage. [0003] Graphene is a two-dimensional monolayer crystal with the highest strength of known materials, extraordinary specific surface area, and excellent electrical and thermal conductivity. It is currently the most ideal two-dimensional nanomaterial. The macroscopically assembled graphene film fully utilizes the characteristics of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y02P20/10
Inventor 高超王冉彭蠡赵晓莉
Owner 杭州德烯科技集团有限公司
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