A three-dimensional ordered and controllable carbon fiber thermally conductive composite material and preparation method thereof

A thermally conductive composite material, three-dimensional ordered technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems that restrict the thermal conductivity of composite materials, unsatisfactory thermal conductivity, contact thermal resistance between fillers, and interface heat between fillers and substrates. In order to maintain the inherent performance, reduce the contact thermal resistance, and improve the interface bonding force

Active Publication Date: 2022-05-10
ANHUI UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The problem solved by the present invention is that the thermal conductivity of traditional polymer-based thermally conductive composite materials is not ideal when the load of thermally conductive filler is low, but when the load of thermally conductive filler is high, it will lead to contact thermal resistance between fillers and interface thermal resistance between filler and matrix Increased problems, which restrict the further improvement of the thermal conductivity of composite materials

Method used

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  • A three-dimensional ordered and controllable carbon fiber thermally conductive composite material and preparation method thereof
  • A three-dimensional ordered and controllable carbon fiber thermally conductive composite material and preparation method thereof
  • A three-dimensional ordered and controllable carbon fiber thermally conductive composite material and preparation method thereof

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preparation example Construction

[0039] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing a three-dimensional ordered and controllable carbon fiber thermally conductive composite material, including:

[0040] The carbon fiber is modified by imidazole ionic liquid containing amino groups to obtain the modified carbon fiber;

[0041] The modified carbon fiber is made into a three-dimensional ordered and controllable carbon fiber skeleton by ice template method;

[0042] The polymer matrix is ​​poured into the three-dimensional ordered and controllable carbon fiber skeleton to obtain the three-dimensional ordered and controllable carbon fiber heat-conducting composite material.

[0043] First, in this example, the imidazole-based ionic liquid containing amine groups can be attached to the surface of carbon fibers through cation-π interaction to perform non-covalent surface modification on carbon fibers.

[0044] Existing carbon fiber thermally conductive composi...

Embodiment 1

[0062] Weigh 500mg of ionic liquid 1-aminopropyl-3-methylimidazolium hydrobromide and disperse it in 1000ml of dimethylformamide (DMF), ultrasonically treat it to obtain a uniform ionic liquid dispersion, add 500mg of carbon fiber to the ion Stir in the liquid dispersion for 12 hours at room temperature, wash twice with ethanol to remove excess ionic liquid after the reaction, and dry in vacuum to obtain modified carbon fibers.

[0063] Surface-modified carbon fibers were freely dispersed in an aqueous solution containing hydroxyethyl cellulose (HEC) (1 wt%), stirred for 30 min to obtain a suspension, and the suspension was poured into a copper mold, and the mold was placed in liquid nitrogen After being vertically frozen for 12 hours, it was placed in a freeze dryer for 24 hours to freeze-dry to obtain a three-dimensional ordered and controllable carbon fiber skeleton.

[0064] Mix epoxy resin, catalyst (methylhexahydrophthalic anhydride), curing agent (2,4,6-(dimethylaminome...

Embodiment 2

[0072]Take 400mg of 1-aminopropyl-3-methylimidazolium hydrobromide and disperse it in 800ml of DMF, and obtain a uniform 1-aminopropyl-3-methylimidazolium hydrobromide dispersion by ultrasonic treatment, then add Add 400 mg of carbon fibers with a length of 350 μm into the dispersion, and stir at room temperature for 48 h. After the reaction, wash with ethanol twice to remove excess ionic liquid, and dry in vacuum to obtain modified carbon fibers.

[0073] Add 20 mg of hydroxyethyl cellulose to 2 ml of water, stir and dissolve in a water bath at 50° C., add the dried modified carbon fiber, and stir for 1 h to obtain a uniform suspension. The suspension was poured into a copper mold, and the mold was placed in liquid nitrogen for vertical freezing for 12 hours, and then placed in a freeze dryer for 24 hours to freeze-dry to obtain a three-dimensional ordered and controllable carbon fiber skeleton.

[0074] Mix 2ml of epoxy resin, 2ml of methylhexahydrophthalic anhydride, and 0...

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Abstract

The invention provides a three-dimensional ordered and controllable carbon fiber heat-conducting composite material and a preparation method thereof. The preparation method comprises: non-covalently modifying the carbon fiber with an amine-containing imidazole ionic liquid to obtain the modified carbon fiber; using the ice template method to make the modified carbon fiber into a three-dimensional ordered and controllable A carbon fiber skeleton; the polymer matrix is ​​poured into the three-dimensionally ordered and controllable carbon fiber skeleton to obtain a three-dimensionally ordered and controllable carbon fiber heat-conducting composite material. In the present invention, the carbon fiber is non-covalently modified, while maintaining the inherent properties of the carbon fiber, reducing the contact thermal resistance between the carbon fibers and the interface thermal resistance between the carbon fiber and the polymer matrix, and improving the interfacial bonding between the carbon fiber and the polymer matrix At the same time, the ice template method is used to form a three-dimensional ordered skeleton, which can regulate the orientation direction of carbon fibers, provide a way for phonon transmission, and achieve the purpose of improving the thermal conductivity of composite materials when carbon fibers are low-loaded.

Description

technical field [0001] The invention relates to the technical field of heat-conducting composite materials, in particular to a three-dimensional ordered and controllable carbon fiber heat-conducting composite material and a preparation method thereof. Background technique [0002] With the continuous integration, miniaturization and high power of electronic and electrical equipment in the electronic information and electrical industry, more and more heat is accumulated per unit area of ​​electronic components. If the heat on the device cannot be dissipated in time, it will be extremely The earth affects the service life and efficiency of the system. Polymer composites that can efficiently dissipate heat, improve device performance and extend their lifetime are key to thermal management of electronic devices. [0003] In traditional polymer-based thermally conductive composite materials, due to the addition of a large amount of fillers, the contact thermal resistance between...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08L1/28C08K9/00C08K9/04C08K7/06C09K5/14
CPCC08L63/00C09K5/14C08L1/284C08K9/00C08K9/04C08K7/06
Inventor 夏茹李娇娇伍斌陈鹏钱家盛张涛王恒曹普汪钦豪
Owner ANHUI UNIVERSITY
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