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Heat-conducting composite material as well as preparation method and application thereof

A technology of thermally conductive composite materials and polymers, which is applied in heat exchange materials, chemical instruments and methods, sustainable manufacturing/processing, etc. The effect of controlling the direction of heat transfer and the preparation method is simple and efficient

Active Publication Date: 2021-06-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current common construction methods for three-dimensional heat conduction networks are difficult to achieve effective control of their shape.
The shape of a three-dimensional heat conduction network generally depends on the choice of template or container, and it is difficult to obtain high dimensional accuracy, and the preparation process is complicated (Composites Communications, 2020, 19, 134-141)
This also limits the structural design of the heat conduction path and the controllability of the direction of heat transfer, which cannot meet the increasingly complex needs of current electronic equipment.

Method used

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  • Heat-conducting composite material as well as preparation method and application thereof
  • Heat-conducting composite material as well as preparation method and application thereof
  • Heat-conducting composite material as well as preparation method and application thereof

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preparation example Construction

[0031] Specifically, as an aspect of the technical solution of the present invention, it relates to a method for preparing a thermally conductive composite material, which includes the following steps:

[0032] The three-dimensional porous graphene obtained by laser treatment of polybenzoxazine resin is used as a heat conduction path, and then the polymer fluid is cast into the pores contained in the three-dimensional porous graphene, and solidified after removing the solvent and / or raising the temperature to 80-350°C After 5-12 hours, a heat-conducting composite material is obtained.

[0033] In some embodiments of the present invention, specifically, the three-dimensional porous graphene is prepared under the conditions that the laser power is 3-20 W, the laser scanning speed is 60-300 mm / s, and the number of laser scanning is 1-10 times.

[0034] In some embodiments, the laser treatment comprises: at least partial treatment of the polybenzoxazine resin to obtain a partially...

Embodiment 1

[0047] (1) In the control software of the laser engraving system (U.S. Universal, VLS 3.50), set the laser power to 8W, the laser rate to 60mm / s, and the number of laser scans to 2 times, and draw the desired engraving in the control software. Zigzag pattern. Based on the above conditions, the MDA type polybenzoxazine resin is partially laser treated to obtain a grapheneized polybenzoxazine resin, such as figure 1 shown.

[0048] (2) MDA type benzoxazine monomer is dissolved in chloroform to obtain a benzoxazine solution with good fluidity and low viscosity, and then cast it on the polybenzoxazine resin whose surface is grapheneized, After removing the solvent and air bubbles under vacuum conditions, curing at 180, 200 and 220 ° C for 2 h each to obtain a thermally conductive composite material, such as figure 1 shown.

[0049] figure 2 This is the SEM photo of polybenzoxazine resin after laser treatment, showing a three-dimensional porous structure.

[0050] image 3 I...

Embodiment 2

[0053] (1) Set the laser power to 3W, the laser speed to 150mm / s, and the number of laser scans to 5 times, and draw the desired engraved cross pattern in the control software. Based on the above conditions, the MDA type polybenzoxazine resin was partially laser treated to obtain the polybenzoxazine resin with a graphene surface.

[0054] (2) Cast the mixture of epoxy resin and curing agent on the surface graphenized polybenzoxazine resin, remove the air bubbles under vacuum and cure at 140°C, 160°C and 180°C for 2 hours respectively to obtain a thermally conductive compound Material.

[0055] The prepared thermal conductive composite material has high thermal conductivity in the direction of the cross pattern, and the thermal conductivity is 30W / (m·K). The heat generated by the LED lights radiates to the surroundings in a cross-shaped pattern, indicating the controllability of the heat transfer direction.

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Abstract

The invention discloses a heat-conducting composite material as well as a preparation method and application thereof. The preparation method comprises the following steps of treating polybenzoxazine resin with laser to obtain three-dimensional porous graphene, taking the three-dimensional porous graphene as a heat-conducting passage, casting a polymer fluid into holes in the three-dimensional porous graphene, removing a solvent and / or heating to 80-350 DEG C, and curing for 5-12 hours to obtain the heat-conducting composite material. The preparation method of the heat-conducting composite material provided by the invention is simple, efficient and high in operability; meanwhile, the heat-conducting composite material provided by the invention shows excellent heat-conducting property, can realize directional transfer of heat, and is expected to play an important role in the field of heat dissipation of electronic equipment.

Description

technical field [0001] The invention belongs to the technical field of heat-conducting materials, and in particular relates to a heat-conducting composite material, a preparation method thereof, and a corresponding application thereof. Background technique [0002] With the continuous improvement of the integration and assembly density of the new generation of micro-miniature electronic equipment, in order to ensure its long-term stable operation, the thermal management technology represented by the development of high thermal conductivity materials and the design of thermal conductivity structures is important and urgent. High thermal conductivity polymer composites not only can efficiently transfer heat, but also have the advantages of light weight, corrosion resistance, easy processing and low cost, so they have attracted extensive attention. The blending method is currently a common method for preparing polymer thermally conductive composites. However, in general, therm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/34C08L63/00C08L83/04C08L79/08C08L75/04C08L69/00C08L25/06C08K3/04C08K7/24C09K5/14
CPCC08K3/042C08K7/24C08L61/34C08L63/00C08L83/04C08L79/08C08L75/04C08L69/00C08L25/06C09K5/14Y02P20/10
Inventor 赵伟伟刘小青余文杰江艳华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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