Heat-conducting and insulating composite high polymer material containing expanded graphite subjected to in-situ surface coating and preparation method thereof

A technology of composite materials and expanded graphite, which is applied in the field of polymer materials, can solve the problems of inability to effectively improve thermal conductivity, inability to build thermal conduction paths, uneven EG dispersion, etc., achieve good thermal conductivity, reduce overall interface thermal resistance, and improve interface bonding force effect

Pending Publication Date: 2022-02-15
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that when EG is selected as a filler and silicone rubber to form a composite material, on the one hand, the uneven dispersion of EG caused by poor interface compatibility between the two cannot build a heat conduction path and the interface thermal resistance is high, which cannot effectively improve heat conduction. Performance; on the other hand, the conductive problem brought by EG to composite materials

Method used

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  • Heat-conducting and insulating composite high polymer material containing expanded graphite subjected to in-situ surface coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 is the preparation of the VMQ material without adding EG, and the specific process is as follows:

[0044] (1) The configured VMQ was hot-pressed on a flat vulcanizer for 15 minutes under the conditions of 150° C. and 120 MPa, and finally cold-pressed under the condition of 100 MPa for 5 minutes to obtain the final thermally conductive composite material.

Embodiment 2

[0046] (1) Mix EG (5wt%) and configured VMQ (95wt%) at room temperature to form a uniformly dispersed suspension.

[0047] (2) The suspension was hot-pressed on a flat vulcanizer under the conditions of 150° C. and 120 MPa for 15 minutes, and finally cold-pressed under the condition of 100 MPa for 5 minutes to obtain a thermally conductive composite material.

Embodiment 3

[0049] (1) Disperse 1.4g of EG powder in 200ml of absolute ethanol, then add 40ml of deionized water and 30ml of NH 4 Oh. After magnetic stirring for 30 min, a uniformly dispersed suspension was obtained.

[0050] (2) Add 3.5ml TEOS to the above suspension, and continue magnetic stirring for 6h to obtain a reaction suspension.

[0051] (3) The reaction suspension was vacuum filtered and washed several times with ethanol and deionized water to remove excess SiO 2 particles, to obtain EG-SiO 2 .

[0052] (4) EG-SiO 2 (5 wt%) and formulated VMQ (95 wt%) were mixed at room temperature to form a homogeneously dispersed suspension.

[0053] (5) The suspension was hot-pressed on a flat vulcanizer under the conditions of 150° C. and 120 MPa for 15 minutes, and finally cold-pressed under the condition of 100 MPa for 5 minutes to obtain a thermally conductive composite material.

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Abstract

The invention discloses a heat-conducting and insulating composite high polymer material containing expanded graphite subjected to in-situ surface coating and a preparation method thereof; the preparation method specifically comprises the following steps: synthesizing nano silicon dioxide (nano SiO2) by adopting a sol-gel method, and coating the surface of expanded graphite (EG-SiO2) in situ; and doping the mixture into methyl vinyl silicone rubber (VMQ) to prepare the heat-conducting and insulating polymer composite material. According to the invention, the interface compatibility of EG and VMQ is effectively improved through the interaction of the nano SiO2 layer and a silicone rubber molecular chain, so that EG can be uniformly dispersed in silicone rubber to construct a continuous heat conduction path, scattering of phonons on a two-phase interface is reduced through good interface combination, and the heat conduction performance is improved; and on the other hand, nano SiO2 is introduced into a two-phase interface to serve as an electron conduction barrier layer, so that the insulating property is improved. Compared with a traditional composite material, the silica gel-based heat-conducting material prepared by the method has excellent heat-conducting property, good insulating property and mechanical property, and can be widely applied to the field of heat management materials. In addition, the heat-conducting insulating polymer composite material is simple and efficient in production process, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a heat-conducting and insulating composite polymer material containing in-situ surface-coated expanded graphite and a preparation method thereof. Background technique [0002] With the continuous improvement of modern electronic equipment and power battery performance requirements, heat dissipation technology has become a key factor restricting the development of related fields. Therefore, in order to improve the reliability and service life of electronic equipment or power batteries, the performance requirements for thermal interface materials (TIM) are also getting higher and higher. Polymer-based composites are strong contenders in the field of thermal management materials due to their excellent combination of properties, including chemical resistance, low density, and ease of processability. TIM is the filling medium between the heat sink and the heat s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K9/10C08K7/24
CPCC08K9/10C08K7/24C08L2203/206C08L83/04
Inventor 吴唯刘兴荣
Owner EAST CHINA UNIV OF SCI & TECH
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