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A boron nitride-based unidirectional insulating composite phase change material and its preparation method

A composite phase change material, boron nitride-based technology, applied in the field of boron nitride-based unidirectional insulating composite phase change materials and its preparation, can solve problems such as poor thermal conductivity and poor insulation, improve thermal conductivity and avoid short circuit risks , highlight the effect of thermal response effect

Active Publication Date: 2022-05-17
山东国烯新材料创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a boron nitride-based unidirectional insulating composite phase change material to overcome the problems of poor insulation of graphene-based high thermal conductivity composite phase change materials and poor thermal conductivity of insulating composite phase change materials in the prior art

Method used

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  • A boron nitride-based unidirectional insulating composite phase change material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take 100 mL of polyvinyl alcohol solution with a concentration of 2.0 wt%, add 2 g of hexagonal boron nitride nanosheets, mechanically stir for 30 minutes, and ultrasonically disperse for 1 hour to obtain a stably dispersed hexagonal boron nitride nanosheet dispersion.

[0025] (2) Lay the hexagonal boron nitride nanosheet dispersion with a thickness of 0.5mm and the high thermal conductivity film in sequence in the mold, and then place the paved material together with the mold in liquid nitrogen for 10 minutes, and then at -54 ° C, Freeze-dry in a 20Pa freeze dryer for 48 hours to obtain a thermally conductive skeleton with boron nitride spacers insulated in the vertical direction.

[0026] (3) Put the phase-change material polyethylene glycol into a container and heat it to a molten state, and then immerse the heat-conducting skeleton in it. Place the container with the phase change material and the thermally conductive frame in a vacuum oven at 80°C, adjust the p...

Embodiment 2

[0028] According to Example 1, the hexagonal boron nitride nanosheets in step (1) of Example 1 were changed to ordinary hexagonal boron nitride, and the rest were the same as in Example 1 to obtain a boron nitride-based unidirectional insulating composite phase change material. The loading of polyethylene glycol is 92.5wt%, the vertical resistivity is 1.5*10^10Ωm, the plane thermal conductivity is 18.6W / m.K, the melting enthalpy is 155J / g, and the phase transition temperature is 44°C.

Embodiment 3

[0030] According to Example 1, the addition amount of the hexagonal boron nitride nanosheets in step (1) of Example 1 was changed to 4g. The rest are the same as in Example 1 to obtain a boron nitride-based unidirectional insulating composite phase change material. Among them, the polyethylene glycol loading is 80.1wt%, the point resistivity in the vertical direction is 1.9*10^10Ωm, the plane thermal conductivity is 31.3W / m.K, the melting enthalpy is 136J / g, and the phase transition temperature is 43°C.

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Abstract

The invention is a boron nitride-based unidirectional insulating composite phase change material. The composite material is obtained by directionally adding a high thermal conductivity two-dimensional thin film in the middle of a boron nitride thermally conductive insulating skeleton, and then impregnating an organic phase change material. Compared with the existing phase change materials, the composite phase change material greatly improves the thermal conductivity while maintaining the insulation performance of the composite phase change material in the vertical direction, reduces the risk of short circuit, and improves the safety of the composite phase change material. It removes obstacles for the application of high thermal conductivity phase change materials in the field of temperature management of electronic devices.

Description

technical field [0001] The invention belongs to the field of energy storage composite materials, and in particular relates to a boron nitride-based unidirectional insulating composite phase change material and a preparation method thereof. Background technique [0002] Especially in the temperature management of electronic devices, with the advent of the 5G era, high-power signal devices have put forward an urgent need for high-performance temperature management materials. With its outstanding latent heat storage capacity (storage heat temperature unchanged), phase change materials have shown great potential in the fields of temperature management of electronic devices, thermal management of new energy vehicle batteries, building insulation, cold and hot chain transportation, and storage and deployment of intermittent energy. Great application prospects. Among them, organic phase change materials have become a type of phase change materials with the most market potential du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063C09K5/066Y02P20/10
Inventor 李宜彬
Owner 山东国烯新材料创新中心有限公司