High-thermal-conductivity carbon fiber/polyetheretherketone electromagnetic shielding composite material

A polyetheretherketone, electromagnetic shielding technology, applied in shielding materials, magnetic field/electric field shielding, electrical components, etc., can solve the problems of inability to build a heat conduction network, poor heat conduction performance, and difficulty in forming a heat conduction path.

Active Publication Date: 2020-01-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the traditional production process, the thermal conductivity of the composite material prepared by carbon fiber and polyetheretherketone is very poor: when the carbon fiber introduction amount is 30wt.%, the thermal conductivity of the composite material is 0.97W / (m K); when the carbon fiber introduction When the amount exceeds 70wt.%, the thermal conductivity of the composite material can reach 2W / (m·K)
The main reason for this phenomenon is the way carbon fibers are dispersed inside the matrix: carbon fibers in traditional carbon fiber / polyether ether ketone composites are independently dispersed in the matrix, and they are isolated from each other. The thermal network

Method used

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  • High-thermal-conductivity carbon fiber/polyetheretherketone electromagnetic shielding composite material
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  • High-thermal-conductivity carbon fiber/polyetheretherketone electromagnetic shielding composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Preparation of high thermal conductivity carbon fiber / polyether ether ketone electromagnetic shielding composite material

[0019] The composite material includes 30wt.% of sulfonated polyetheretherketone and its sodium salt bicomponent, 40wt.% of polyetheretherketone and 30wt.% of carbon fiber. The melt index of polyetheretherketone is 21g / 10min; the carbon fiber is pitch-based carbon fiber, the aspect ratio is (200-2000):1, and the length is 200-500μm. The specific operation is as follows:

[0020] Dissolve 4,4'-difluorobenzophenone into 98wt.% concentrated sulfuric acid, and the mass ratio of 4,4'-difluorobenzophenone to concentrated sulfuric acid is 1:10. The reaction system was kept stirring at 100° C. for 10 h. The reaction was cooled to room temperature, and the reaction solution was poured into a large amount of ice water to cool. Then NaCl was added to the reaction solution until precipitation occurred, the product was filtered, washed repeatedly with dei...

Embodiment 2

[0053] 1. Preparation of high thermal conductivity carbon fiber / polyether ether ketone electromagnetic shielding composite material

[0054] The composite material comprises 20wt.% of sulfonated polyetheretherketone and its sodium salt, 50wt.% of polyetheretherketone and 30wt.% of carbon fiber. The melt index of PEEK is 21g / 10min; the carbon fiber is pitch-based carbon fiber, the aspect ratio is (200-2000):1, and the length is 200-500μm. The specific preparation of sulfonated polyether ether ketone and its sodium salt is the same as in Example 1, the preparation of sulfonated polyether ether ketone with a sulfonation degree of 30%, and the neutralization ratio of sulfonated polyether ether ketone sulfonate is 48.89%. Two-component sulfonated polyether ether ketone and its sodium salt.

[0055] After uniformly mixing all the raw materials in proportion, the composite material is prepared by hot pressing. Under the condition of no pressure at 350°C, melt all the resin in the i...

Embodiment 3

[0061] 1. Preparation of high thermal conductivity carbon fiber / polyether ether ketone electromagnetic shielding composite material

[0062] The composite material comprises 10wt.% of sulfonated polyetheretherketone and its sodium salt, 60wt.% of polyetheretherketone and 30wt.% of carbon fiber. The melt index of PEEK is 21g / 10min; the carbon fiber is pitch-based carbon fiber, the aspect ratio is (200-2000):1, and the length is 200-500μm. The specific preparation of sulfonated polyether ether ketone and its sodium salt is the same as in Example 1, the preparation of sulfonated polyether ether ketone with a sulfonation degree of 30%, and the neutralization ratio of sulfonated polyether ether ketone sulfonate is 48.89%. Two-component sulfonated polyether ether ketone and its sodium salt.

[0063] After uniformly mixing all the raw materials in proportion, the composite material is prepared by hot pressing. Under the condition of no pressure at 350°C, melt all the resin in the i...

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Abstract

The invention discloses a high-thermal-conductivity carbon fiber / polyetheretherketone electromagnetic shielding composite material, and belongs to the field of high-performance composite materials. The composite material is prepared by uniformly mixing 10-50 wt% of sulfonated polyetheretherketone and its sodium salt, 40-80 wt% of polyetheretherketone and 5-30 wt% of a carbon fiber in proportion and then carrying out a hot pressing process. The sulfonated polyetheretherketone and its sodium salt is prepared by reacting sulfonated polyetheretherketone with an alkaline sodium salt solution to neutralize a part of sulfonate radicals, wherein the neutralization ratio of the sulfonate radicals is 30-70%. Compared with traditional carbon fiber / polyetheretherketone composite materials, the composite material prepared in the invention has obviously enhanced thermal conductivity, and the heat conductivity of the composite material at a low filling amount exceeds 2 W / (m.K). In addition, the composite material has very excellent electromagnetic shielding property and mechanical properties.

Description

technical field [0001] The invention belongs to the field of high-performance composite materials, in particular to a high thermal conductivity carbon fiber / polyether ether ketone electromagnetic shielding composite material. Background technique [0002] Relying on the advantages of light weight, corrosion resistance, high processability and great operability, special engineering plastics have gradually developed into various fields. However, as a kind of polymer material, its own molecular structure makes the propagation efficiency of phonon vibration in it extremely low, and it cannot conduct timely, dissipate heat or shield electromagnetic. In order to further expand its application, it needs to be further modified to prepare thermally conductive electromagnetic shielding materials. . [0003] The blending method to prepare thermally conductive composite materials has become the main method for preparing composite materials at home and abroad due to its advantages of si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/16C08K7/06H05K9/00
CPCC08K2201/004C08K2201/016C08L61/16C08L2205/025H05K9/009C08K7/06
Inventor 牟建新赵轩李澍王振洋陈瑞温丰宇
Owner JILIN UNIV
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