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High thermal conductivity shape-stabilized phase change composite material and preparation method thereof

A composite material and shape-fixed phase change technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of mechanical properties such as compression resistance that are rarely reported, achieve good compression resistance, improve thermal conductivity, and enhance mechanical properties performance effect

Inactive Publication Date: 2017-07-28
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the most promising material in the field of thermal management such as power batteries, the research on the mechanical properties of shape-fixed phase change materials often focuses on the tensile strength, while the research on the mechanical properties such as compression resistance required in the actual application process is seldom. to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Choose a density of 1.13g / cm 3 Coal tar is the precursor of carbon materials:

[0031] (1) Mold expanded graphite with an expansion ratio of 150ml / g to a density of 0.10g / cm 3 The expanded graphite preform;

[0032] (2) Immerse the expanded graphite prefabricated body in coal tar, take it out after vacuum impregnation at -0.09MPa for 60min, and pressure impregnation at 0.8MPa for 60min;

[0033] (3) At a heating rate of 3°C / min to 1000°C, carbonize the expanded graphite adsorbed with coal tar for 30 minutes at this temperature to obtain an expanded graphite / porous carbon material composite;

[0034] (4) Using the vacuum impregnation method, the expanded graphite / porous carbon material composite was immersed in paraffin wax with a melting point of 51.4°C at -0.09MPa, and vacuum impregnated for 1.5h to obtain a high thermal conductivity shape-setting phase change material. Expanded graphite: porous carbon material: phase change material is 8.7%: 22%: 69.3%, and its pro...

Embodiment 2

[0036] Choose a density of 1.13g / cm 3 Coal tar is the precursor of carbon materials:

[0037] (1) Mold expanded graphite with an expansion ratio of 150ml / g to a density of 0.15g / cm 3 The expanded graphite preform;

[0038] (2) Immerse the expanded graphite prefabricated body in coal tar, vacuum infiltrate at -0.09MPa for 75min, and impregnate for 60min at 1.2MPa to take out;

[0039] (3) heating up to 800°C at 3°C / min, and then heating up to 2500°C at 10°C / min, heat-treating the expanded graphite with coal tar adsorbed thereon for 30 minutes at this temperature to obtain an expanded graphite / porous carbon material composite;

[0040] (4) Using the vacuum impregnation method, the expanded graphite / porous carbon material composite was immersed in paraffin wax with a melting point of 51.4°C at -0.09 MPa, and vacuum impregnated for 2 hours to obtain a high thermal conductivity shape-setting phase change material. Expanded graphite: porous carbon material: phase change material ...

Embodiment 3

[0042] Choose a density of 1.21g / cm 3 The mesophase coal tar pitch is the precursor of carbon materials:

[0043](1) Mold expanded graphite with an expansion ratio of 150ml / g to a density of 0.16g / cm 3 The expanded graphite preform;

[0044] (2) After the mesophase coal tar pitch is placed in quinoline and extracted for 3.5h to obtain the mesophase coal tar pitch quinoline soluble matter solution, the expanded graphite preform is immersed in the mesophase coal tar pitch quinoline soluble matter solution, -0.09 Vacuum impregnation under MPa for 60min, 0.9MPa pressure impregnation for 60min, then take out;

[0045] (3) heat-treating the expanded graphite with coal tar adsorbed thereon for 30 min at a heating rate of 2 °C / min to 650 °C and 5 °C / min to 2000 °C to obtain an expanded graphite / porous carbon material composite;

[0046] (4) Using the vacuum impregnation method, the expanded graphite / porous carbon material composite was immersed in paraffin wax with a melting point ...

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Abstract

The invention discloses a high thermal conductivity shape-stabilized phase change composite material which comprises the following components: 6.7-54.0wt% of expanded graphite, 5.3-38.6wt% of a porous carbon material and 28.4-81.9wt% of an organic phase change substance. The composite material disclosed by the invention has the advantages of excellent thermal conductivity, high mechanical property and high phase-change latent heat.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, and in particular relates to a high thermal conductivity shape-changing composite material and a preparation method thereof. Background technique [0002] New energy vehicles represented by pure electric vehicles are gradually getting rid of dependence on fossil fuels and becoming the mainstream direction of automobile development. The power of electric vehicles is mainly derived from power batteries. Lithium-ion power batteries have occupied the main market of power batteries due to their advantages in specific energy, specific power, service life and working voltage. Lithium-ion batteries can only ensure good charge and discharge efficiency, reliability and lifespan if they work at a suitable temperature. A reasonable and effective thermal management system is required to ensure that the power battery is in a suitable temperature range. At present, the power battery thermal mana...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 王宏宝陶则超赵文光刘占军郭全贵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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