A method for preparing carbon fiber and graphene composite paper

A graphene composite and carbon fiber technology, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, papermaking, etc., can solve the problem of toughness and cleanliness requirements of thermal interface materials, graphene paper, etc. Poor mechanical strength, high economic cost, etc., to achieve the effect of abundant raw material sources, elimination of local hot spots, and wide application prospects

Active Publication Date: 2015-08-19
山东热坤新材料有限公司
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Problems solved by technology

However, the above-mentioned heat-conducting products still have certain defects. The thickness of natural graphite paper is relatively large, mostly above 100 μm, which limits its application in microelectronic devices to a certain extent; the preparation of artificially synthesized graphite paper requires extremely high temperature environments. The conditions are harsh, the economic cost is high, and it is not conducive to further popularization and application; the mechanical strength of graphene paper is poor, the bending life is low, and there is a problem of slag falling during use, which cannot meet the requirements for toughness and cleanliness in the application of thermal interface materials. Requirements (Sung Ho Song, Kwang Hyun Park, Bo Hyun Kim, et al.Enhanced thermal conductivity of epoxy–graphene composites by using non-oxidized graphene flakes with non-covalent functionalization Improvement of Thermal Conductivity of Oxygen Resin-Graphene Composite[J].Advanced Materials,2013,25,732-737.)

Method used

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  • A method for preparing carbon fiber and graphene composite paper

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Polyacrylonitrile-based carbon fiber with a length of 10mm is used as the skeleton matrix, mixed with polyvinyl alcohol and deionized water to prepare a suspension, carbon fiber: polyvinyl alcohol = 1:1 (mass ratio), (carbon fiber + polyvinyl alcohol) Vinyl alcohol): deionized water = 1:4000 (mass ratio), and then wet-processed to prepare the carbon fiber precursor matrix;

[0026] (2) Ultrasonicate the graphite oxide prepared by the Hummers method in water, the ultrasonic time is 30min, the ultrasonic power is 100W, and a graphene oxide solution with a concentration of 4mg / mL is prepared, and the graphene oxide: carbon fiber precursor matrix = 8 : 1 (mass ratio), the graphene oxide solution and the carbon fiber precursor matrix are subjected to vacuum filtration deposition and compounding to obtain carbon fiber and graphene oxide composite paper;

[0027] (3) Treat carbon fiber and graphene oxide composite paper at 1000°C for 3 hours under hydrogen protection to ob...

Embodiment 2

[0030] (1) The pitch-based carbon fiber with a length of 0.1 mm is used as the skeleton matrix, mixed with water-soluble phenolic resin and deionized water to form a suspension, carbon fiber: phenolic resin = 10:1 (mass ratio), (carbon fiber + Phenolic resin): deionized water = 1:8000 (mass ratio), and then wet-processed to prepare the carbon fiber precursor matrix;

[0031] (2) Ultrasonicate the graphite oxide produced by the electrochemical oxidation method in deionized water, the ultrasonic time is 60min, and the ultrasonic power is 120W, to obtain a graphene oxide solution with a concentration of 0.1mg / mL, and follow the graphene oxide: carbon fiber Precursor matrix = 5:1 ratio (mass ratio), the graphene oxide solution and the carbon fiber precursor matrix are coated and compounded to obtain carbon fiber and graphene oxide composite paper;

[0032] (3) Carbon fiber and graphene oxide composite paper was treated at 2000°C under argon protection for 7 hours to obtain carbon ...

Embodiment 3

[0035] (1) Use viscose-based carbon fiber with a length of 20mm as the skeleton matrix, mix it with pulp and deionized water to make a suspension, carbon fiber: pulp = 1:10 (mass ratio), (carbon fiber + pulp): go Ionized water = 1:1000 (mass ratio), and then wet-processed to prepare the carbon fiber precursor matrix;

[0036](2) Ultrasonicate the graphite oxide produced by the electrochemical oxidation method in deionized water, the ultrasonic time is 10min, and the ultrasonic power is 300W, to obtain a graphene oxide solution with a concentration of 10mg / mL, and follow the graphene oxide: carbon fiber precursor Body matrix = 1:20 (mass ratio), the graphene oxide solution and the carbon fiber precursor matrix are coated and compounded, and the number of coatings is 5 times to obtain a carbon fiber and graphene oxide composite paper;

[0037] (3) Treat carbon fiber and graphene oxide composite paper at 2500°C for 10 hours under vacuum protection to obtain carbon fiber and graph...

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Abstract

The invention relates to a method for preparing carbon fibre and graphene composite paper. The method comprises the following steps: performing ultrasonic treatment on graphite oxide in deionized water for 5-100 minutes at the ultrasonic power of 50-300W, thus obtaining a graphene oxide solution with the concentration being 0.1-10mg / mL; performing sedimentation compounding on the graphene oxide solution and a carbon fibre precursor substrate at the mass ratio of the graphene oxide solution to the carbon fibre precursor substrate being (0.01-100):1, thus obtaining carbon fibre and graphene oxide composite paper; and performing high-temperature processing under a protective atmosphere or vacuum protective condition for 0.1-10 hours at the temperature of 300-3,000 DEG C, thus obtaining the carbon fibre and graphene composite paper. The method has the advantages of high thermal conductivity, high conductivity, good mechanical property, and easiness in realizing large-scale production.

Description

technical field [0001] The invention belongs to a method for preparing composite paper, in particular to a method for preparing carbon fiber and graphene composite paper. Background technique [0002] as by carbon atom sp 2 Graphene is a single-atom-thick two-dimensional crystal bonded together. Graphene has excellent mechanical, thermal, optical, and electrical properties, and has attracted widespread attention in scientific research and industry (Yiqing Sun, Gaoquan Shi. Graphene / polymer composites for energy applications Graphene Application of olefin / polymer composites in energy [J]. Journal of Polymer Science, Part B: Polymer Physics, 2013, 51, 231-253.). The theoretical thermal conductivity of graphene is as high as 5300W / m K, much higher than that of silver (429W / m K), copper (401W / m K), gold (317W / m K), aluminum (237W / m K ) and other metals and carbon nanotubes (3000W / m·K) thermal conductivity. Excellent thermal conductivity makes graphene expected to be widely us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/50C04B35/83C04B35/622
Inventor 陈成猛高建国刘卓孔庆强张兴华李晓明蔡榕
Owner 山东热坤新材料有限公司
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