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Preparation method of carbon fiber paper

A technology of carbon fiber paper and carbon fiber, which is applied in the direction of special paper, non-fiber pulp addition, fiber raw material processing, etc., can solve the problems of carbon fiber paper uniformity, production control difficulties, and limited dispersion, and achieve improved electrical conductivity and good dispersion , little negative effect

Pending Publication Date: 2021-11-02
浙江超探碳纤维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to improve the problems caused by limited dispersion in the carbon fiber papermaking process, the present invention adopts the method of adding aramid fiber and aramid pulp to improve the uniformity of carbon fiber paper and the shortcomings of difficult control in production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example is a comparative example.

[0032] Take 5mm chopped polyacrylonitrile carbon fiber, soak it in 6M NaOH solution at room temperature for 30min, then wash it with clear water and dry it, and use it as the raw material of chopped carbon fiber for making carbon fiber paper; Cut carbon fiber raw materials, disperse, and make paper to obtain carbon fiber base paper. The base paper is impregnated with phenolic resin ethanol solution, dried, and hot-pressed at 150°C and 0.8MPa for 30 minutes; the hot-pressed carbon fiber paper is cured at 200°C for 1 hour and placed in an inert carbonization treatment at 1000°C for 1 hour in an atmospheric carbonization furnace; and then graphitization at a temperature above 2000°C for 30 minutes in an inert atmosphere, thereby obtaining carbon fiber paper. The performance parameters of carbon fiber paper are: thickness 173±6μm, apparent density 0.43g / cm 3 , tensile strength 19.4MPa, thermal conductivity 13W / m.K, resistivity 6.9mΩ...

Embodiment 2

[0034] This example is a comparative example in which aramid fibers are added to improve the uniformity. Get 5mm chopped polyacrylonitrile carbon fiber, soak 30min at normal temperature in the NaOH solution of 6M, then wash with clear water, dry, as the chopped carbon fiber raw material of preparing carbon fiber paper; According to chopped polyacrylonitrile carbon fiber: chopped aramid Fiber = 1:0.1 The mass ratio is 3mm chopped aramid fiber, and the surface treatment of aramid fiber is 1.2×10 -3 The concentration of sodium dodecylbenzenesulfonate aqueous solution is soaked at 60 ℃ for 30 minutes, after the soaking is completed, it is washed with clean water and then dried as the raw material of chopped aramid fiber; according to the chopped polyacrylonitrile carbon fiber: aramid pulp = Take aramid pulp at a mass ratio of 1:0.05; use polyethylene oxide as a dispersant to disperse the above-mentioned chopped polyacrylonitrile carbon fiber, chopped aramid fiber and aramid pulp r...

Embodiment 3

[0036] Get 5mm chopped polyacrylonitrile carbon fiber, soak 30min at normal temperature in the NaOH solution of 6M, then wash with clear water, dry, as the chopped carbon fiber raw material of preparing carbon fiber paper; According to chopped polyacrylonitrile carbon fiber: chopped aramid Fiber=1:0.1 mass ratio takes 3mm chopped aramid fiber, and the surface treatment of chopped aramid fiber adopts 1.2×10 -3 The concentration of sodium dodecylbenzenesulfonate aqueous solution is soaked at 60 ℃ for 30 minutes, after the soaking is completed, it is washed with clean water and then dried as the raw material of aramid chopped fiber; according to the chopped polyacrylonitrile carbon fiber: aramid pulp = Aramid pulp is taken at a mass ratio of 1:0.05; the above-mentioned chopped polyacrylonitrile carbon fiber, chopped aramid fiber and aramid pulp raw material are dispersed in water with polyethylene oxide as a dispersant, and papermaking is carried out to obtain carbon fiber composi...

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Abstract

The invention belongs to the technical field of carbon fiber application, and discloses a preparation method of carbon fiber paper. The preparation method comprises the following steps: carrying out surface treatment on chopped carbon fibers and chopped aramid fibers; with the carbon fibers, the aramid fibers and the pulp as raw materials, conducting dispersion and papermaking to prepare carbon fiber base paper; and adding a mesophase pitch fiber layer on the surface of carbon fiber base paper by adopting a melt-blowing method, carrying out oxidation-crosslinking on mesophase pitch fibers at 200-350 DEG C by adopting air as an oxidizing agent so as to obtain composite carbon fiber base paper when a precursor is not molten, dipping the composite carbon fiber base paper in a thermosetting phenolic resin ethanol solution, and successively carrying out hot pressing, curing, carbonization and graphitization to obtain the carbon fiber paper. By adding the aramid fibers, the structural uniformity and strength of the carbon fiber paper are effectively improved; the introduction of mesophase pitch enables the carbon fiber paper to have higher electric conductivity and thermal conductivity; and the prepared carbon fiber paper can meet the preparation requirements of high-performance fuel cells, high-temperature filtration and advanced composite materials.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber application, and in particular relates to a preparation method of carbon fiber paper. Background technique [0002] Carbon fiber refers to a high-performance fiber with a carbon content greater than 90%. It has high tensile strength and modulus, low density, electrical conductivity, and thermal conductivity. It is widely used in high-tech technical fields. There are not many cases of direct application of carbon fiber tow, and more is the application of carbon fiber into a certain form of primary products, such as carbon cloth, carbon fiber paper and braided bodies. [0003] There are two main varieties of carbon fiber, polyacrylonitrile-based carbon fiber (PAN carbon fiber) and pitch-based carbon fiber. In comparison, polyacrylonitrile carbon fiber has advantages in terms of strength and cost, while pitch carbon fiber (generally referred to as mesophase pitch carbon fiber, that is, high-per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/00D21H13/50D21H15/02D21H13/26D21H19/14D21H17/48
CPCD21H27/00D21H13/50D21H15/02D21H13/26D21H19/14D21H17/48
Inventor 汪训国王波江旭
Owner 浙江超探碳纤维科技有限公司
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