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

A technology of thermally conductive composite materials and composite films, which can be used in heat exchange materials, applications, other household appliances, etc., can solve problems such as restricting the application of two-dimensional materials, and achieve the effect of high thermal conductivity

Active Publication Date: 2021-02-02
佛山(华南)新材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the thermal conductivity of two-dimensional thermally conductive materials such as hexagonal boron nitride (HBN), lamellar graphite or graphene can reach hundreds of W / m K in the in-plane direction, and its excellent thermal conductivity has great advantages in thermally conductive composite materials. It has broad application prospects, but the existing technology cannot make full use of its anisotropic properties to maximize the thermal conductivity of thermally conductive composites, which also restricts the application of two-dimensional materials in thermally conductive composites

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

Examples

Experimental program
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Effect test

Embodiment 1

[0037] This embodiment provides a thermally conductive composite material and a preparation method thereof, Figure 1 ~ Figure 4 It is a schematic flow chart of the preparation method of the thermally conductive composite material in Example 1 of the present invention. refer to Figure 1 ~ Figure 4 , the preparation method of the heat-conducting composite material comprises the following steps:

[0038] Filler pretreatment: 15 parts by mass of graphene and 60 parts by mass of spherical alumina powder are mixed and modified with coupling agent KH550 to obtain modified fillers.

[0039] S1: uniformly mix the modified filler with 25 parts by mass of polyvinyl alcohol to form a slurry.

[0040] S2: Reference figure 1 , the slurry is formed by calendering process such as figure 1 The first composite membrane 100.

[0041]S3: Reference figure 2 , the first composite film 100 is wound along the side to form a closely attached first cylinder.

[0042] S4: Form the second compo...

Embodiment 2

[0046] This embodiment provides a heat-conducting composite material. The difference from Embodiment 1 is that 20 parts by mass of hexagonal boron nitride and 60 parts by mass of spherical alumina powder treated with ultrasound and coupling agent KH560 are used as fillers, and 20 parts by mass of spherical alumina powder are used as fillers. Silicone oil in parts by mass is used as a polymer matrix. The preparation method of the heat-conducting composite material is the same as that of Example 1.

Embodiment 3

[0048] This embodiment provides a thermally conductive composite material. The difference from Embodiment 1 is that 20 parts by mass of lamellar graphite and 70 parts by mass of spherical alumina powder chemically grafted with aminopolysiloxane are used as fillers to 10 parts by mass of silicone oil as a polymer matrix. The material preparation steps are the same as in Example 1.

[0049] Comparative Experiment

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Abstract

The invention provides a heat-conducting composite material as well as a preparation method and application thereof. The preparation method of the heat-conducting composite material comprises the following steps of S1, mixing a filler and a polymer matrix to obtain slurry; S2, forming a first composite film from the slurry by a thin film forming process; S3, winding the first composite film to form a first cylinder; S4, enabling the first cylinder to form a second composite film by the thin film forming process, and winding to subsequently form a second cylinder; and S5, pressurizing and curing the second cylinder, wherein the filler comprises a two-dimensional heat-conducting sheet. According to the preparation method, a high-heat-conducting composite material is prepared in the manner that a thin film is curled and then pressurized for forming; the two-dimensional heat-conducting sheet adopted in the course of forming the thin film is arranged in the plane direction of the thin filmunder the action of pressure and/or shearing force; a pressure influence caused by pressurization is enhanced by repeating a curling step and an extrusion step; the two-dimensional heat-conducting sheet is oriented as much as possible; the anisotropic heat conduction performance of the two-dimensional heat-conducting sheet is fully utilized; and a higher heat conductivity is obtained.

Description

technical field [0001] The invention relates to the technical field of thermal management materials, in particular to thermal conductive composite materials and their preparation methods and applications. Background technique [0002] With the rapid development of electronic technology and the continuous rise of 5G communications, Internet of Things, new energy automotive electronics, smart wearable devices and other fields, the power density and integration of related electronic devices are increasing day by day. When the electronic device is working, part of the power loss is exported as heat, and the heat dissipation of the electronic device will directly lead to a rapid rise in the temperature of the electronic device and an increase in thermal stress, which will affect the reliability, safety and service life of the electronic device. serious threat. This has also made people in the industry gradually realize that whether the technology of thermal conductive materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/42B29C69/00B29D7/01C09K5/14
CPCB29C70/42B29C69/001B29D7/01C09K5/14
Inventor 崔巍孙琪祝渊迟克禹
Owner 佛山(华南)新材料研究院
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