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Expanded graphite/polyetheretherketone highly conductive composite material and its preparation method and application

A technology of expanded graphite and polyether ether ketone, which is applied in the field of expanded graphite/polyether ether ketone high-conductivity composite materials and its preparation, can solve the problems of reducing the mechanical properties of composite materials, low surface energy of graphite, and increased mechanical properties. Achieve the effects of improving uniform dispersion, improving interlayer peeling, and high electrical conductivity

Active Publication Date: 2022-06-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low surface energy of graphite and its easy agglomeration characteristics, when it is used as a conductive filler and composited with resin, it often appears similar to microcracks and pores, which reduces the mechanical properties of the composite material, and the degree of mechanical properties decreases with the increase of graphite content. grow bigger
In the prior art, the expanded graphite / polyether ether ketone (PEEK) composite material has the problem of improving the electrical properties while causing a significant decrease in its mechanical properties, thus limiting its application

Method used

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  • Expanded graphite/polyetheretherketone highly conductive composite material and its preparation method and application
  • Expanded graphite/polyetheretherketone highly conductive composite material and its preparation method and application
  • Expanded graphite/polyetheretherketone highly conductive composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In the present embodiment, the expanded graphite / polyetheretherketone high-conductivity composite material sheet with an expanded graphite mass percentage content of 70% is prepared, and the steps are as follows:

[0040] Weigh 3.5g of expanded graphite and 1.5g of polyetheretherketone powder and place it in a beaker containing 150mL of absolute ethanol, insert the probe of the homogenizer, and perform high-speed shear dispersion and premix for 0.5h at a rotational speed of 10000rpm; Keep the amount of absolute ethanol at 150mL, place the beaker in an ice-water bath, insert the ultrasonic generator probe, and perform ultrasonic treatment for 2 hours at a frequency of 20KHz. Expanded graphite / PEEK mixed powder;

[0041] After preheating the flat vulcanizer to 180°C, the surface of the mold is polished clean and then placed in the flat vulcanizer for 15 minutes, then taken out, and the surface is evenly coated with release agent. The polyether ether ketone mixed powder w...

Embodiment 2

[0044] In this example, the expanded graphite / polyetheretherketone high-conductivity composite material sheet with an expanded graphite mass percentage content of 67.5% was prepared. The steps were the same as those in Example 1, and four probes were used to pair the obtained expanded graphite / polyetheretherketone. The electrical conductivity of the high-conductivity composite material was tested at multiple points, and the bending specimen was tested on the electronic universal material testing machine. The results are as follows Figure 4 and 5 As shown, the average electrical conductivity was 127 s / cm and the average flexural strength was 56.59 MPa.

Embodiment 3

[0046] In this example, the expanded graphite / polyetheretherketone high-conductivity composite material sheet with a mass percentage of expanded graphite of 65% was prepared. The steps were the same as those in Example 1, and four probes were used to pair the obtained expanded graphite / polyetheretherketone. The electrical conductivity of the high-conductivity composite material was tested at multiple points, and the bending specimen was tested on the electronic universal material testing machine. The results are as follows Figure 4 and 5 As shown, the average electrical conductivity was 113.5 s / cm and the average flexural strength was 59.95 MPa.

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Abstract

The invention discloses an expanded graphite / polyether ether ketone high-conductivity composite material, a preparation method and an application thereof, and belongs to the technical field of conductive composite materials. The composite material is composed of expanded graphite with a mass percentage of 40%-70% and polyether ether ketone with a mass percentage of 30%-60%. Ultrasonic treatment, drying, the obtained expanded graphite / polyether ether ketone mixed powder is pressurized to 20MPa at 175-185°C and cold-pressed for 10-20min, after depressurization to normal pressure, heated to 385-395°C and kept warm 20-40min, naturally cooled to room temperature. The expanded graphite / polyetheretherketone high-conductivity composite material of the present invention has both high conductivity and good mechanical properties, and the high-conductivity performance of the composite material can be realized through high-power ultrasonic treatment combined with sintering and hot-pressing forming process, which can be used for precision instruments and highly corrosive workplaces.

Description

technical field [0001] The invention belongs to the technical field of conductive composite materials, in particular to an expanded graphite / polyetheretherketone high conductive composite material and a preparation method and application thereof. Background technique [0002] The properties of graphite are between metals and non-metals, and to a certain extent, it has the advantages of both. It has the following characteristics: excellent high temperature resistance, electrical conductivity several times that of other non-metallic materials, extremely low thermal expansion coefficient, high temperature It has almost no deformation and strong chemical stability, and is a conductive filler with excellent comprehensive properties. However, due to the low surface energy of graphite and its easy agglomeration characteristics, when it is used as a conductive filler and composited with resin, it often appears similar to microcracks and pores, which reduces the mechanical properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/16C08K7/24C08J5/18
CPCC08J5/18C08K2201/001C08J2361/16C08K7/24
Inventor 周晓东杨永波马辉煌
Owner EAST CHINA UNIV OF SCI & TECH