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Treatment method for surface modification of high thermal conductivity carbon fiber

A treatment method and surface modification technology, which is applied in fiber treatment, carbon fiber, textiles and papermaking, etc., can solve the problems of increased surface graphitization order, poor wettability, and increased difficulty, so as to improve the treatment effect, The effect of increasing wettability and improving uniformity

Active Publication Date: 2019-09-06
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The increase of the thermal conductivity of carbon fiber is accompanied by the gradual increase of the degree of crystallization, the order of graphitization on the surface increases, the polarity decreases, and the wettability with water becomes worse, which makes the electrochemical oxidation treatment of high thermal conductivity carbon fiber more difficult.

Method used

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  • Treatment method for surface modification of high thermal conductivity carbon fiber

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Effect test

Embodiment 1

[0015] The 1.5K mesophase pitch-based carbon fiber obtained by heat treatment at 2800°C was electrochemically treated by constant current anodic oxidation technology. The electrolyte configuration method was as follows: 30g ammonium bicarbonate, 10g ammonium acetate and 10g ammonium dihydrogen phosphate were dissolved in 400g deionized water, Then add 50g of acetone and mix well. With carbon fiber as the anode and stainless steel plate as the cathode, the carbon fiber is subjected to constant current oxidation treatment at 50°C, and the current density is 2mA / cm 2 . The surface-treated carbon fiber was tested for thermal conductivity and ILSS respectively. The ILSS test sample was obtained by compounding the surface-treated carbon fiber with bisphenol A epoxy resin 6101. The volume ratio of carbon fiber to resin was 6:4, and the curing agent was Triethylenetetramine, curing temperature 80°C, curing time 2 hours. The test results are shown in Table 1.

Embodiment 2

[0017] Replace the acetone in embodiment 1 with 50g isopropanol, and others are the same as embodiment 1. The test results are shown in Table 1.

Embodiment 3

[0019] The electrolytic solution preparation method is as follows: 30g of ammonium bicarbonate, 10g of ammonium acetate and 10g of ammonium dihydrogen phosphate were dissolved in 420g of deionized water, and then 30g of acetone was added and mixed evenly. Others were the same as in Example 1. The test results are shown in Table 1.

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Abstract

The invention relates to a treatment method for surface modification of high thermal conductivity carbon fiber. In the treatment method the surface activity of the thermal conductivity carbon fiber isimproved by constant electrolytic oxidation in low polar electrolyte solution, the electrolyte solution consists of a solvent and electrolyte, the solvent is a low polar mixed solvent with organic reagents and water, and the organic reagents are reagents of ethanol, acetone isopropanol, n-butanol, acetic acid and the like which are soluble in water and have lower polar than water; the electrolyteis preferably one or more of ammonium acid carbonate, ammonium bisulfate, ammonium carbonate, ammonia sulfate, ammonium acetate, ammonium tertiary phosphate, ammonium dibasic phosphate and ammonium biphosphate. With the method, the surface activity of the high thermal conductivity carbon fiber can be improved obviously, the adhesion between the carbon fiber and resin matrix is improved, and meanwhile, the thermal conductivity of the fiber cannot be decreased.

Description

technical field [0001] The invention belongs to the field of electrochemistry and fiber materials, and in particular relates to a treatment method for surface modification of high thermal conductivity carbon fibers. Background technique [0002] High thermal conductivity carbon fibers represented by mesophase pitch-based carbon fibers have excellent thermal conductivity, mechanical properties and stability, and have attracted much attention in high-tech fields such as aerospace. Early high thermal conductivity carbon fibers were mainly used in the preparation of carbon / carbon composite materials and carbon / ceramic composite materials. With the advancement of technology, they gradually expanded to the field of resin-based composite materials. When used as a reinforcement of resin-based composites, the surface activity of carbon fibers directly affects the interfacial bonding properties of composites. After high-temperature heat treatment, high thermal conductivity carbon fib...

Claims

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Application Information

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IPC IPC(8): D06M11/74C08K9/02C08K7/06C08L63/00C08J5/06D06M101/40
CPCC08J5/06C08J2363/00C08K7/06C08K9/02D06M11/74D06M2101/40
Inventor 田艳红张学军
Owner BEIJING UNIV OF CHEM TECH
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