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Preparation method of high-performance polyacrylonitrile-based carbon fibers

A polyacrylonitrile carbon fiber and pretreatment technology, applied in fiber treatment, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of carbon fiber mechanical properties and ablation resistance reduction, oxidative ablation, escape, etc.

Active Publication Date: 2013-12-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these modifiers all contain metal ions, they will escape or undergo oxidative ablation during high-temperature carbonization, resulting in a decrease in the mechanical properties and ablation resistance of carbon fibers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The preparation method of polyacrylonitrile precursor carbon fiber according to the present invention may comprise the steps of: first passing the polyacrylonitrile precursor through a modification bath containing the polyacrylonitrile precursor pretreatment reagent described in the present invention, and then proceeding sequentially Pre-oxidation treatment, low-temperature carbonization treatment, high-temperature carbonization treatment and other treatment methods.

[0039] Wherein, described pre-oxidation treatment, low-temperature carbonization treatment, and high-temperature carbonization treatment are conventional methods in this field, and can be carried out in commonly used equipment, devices or instruments, such as described pre-oxidation is pre-oxidation commonly used in this field Carry out in the furnace, described low-temperature carbonization treatment or high-temperature carbonization treatment are all carried out in the carbonization furnace commonly used...

Embodiment 1

[0057] Example 1: Carbon Fiber 1

[0058] The polyacrylonitrile precursor was passed through a modification bath, and the weight percentages of amino-modified silicone oil (purchased from Zhejiang Xinyue Fine Chemical Co., Ltd.) and ammonium pentaborate in the bath were 0.5% and 2%, respectively, and the rest was water. When passing through the bath, the temperature is 30°C and the residence time is 1min;

[0059] Then enter the preoxidation furnace, respectively stay 10min at 220, 230, 240, and 260° C., and the percentage of drawing is controlled at 5%, 3%, 1%, and 1% respectively;

[0060] Then carry out low-temperature carbonization treatment under nitrogen atmosphere at 300-800°C, and control the drafting percentage at 5%;

[0061] Then carry out high-temperature carbonization treatment under 1800 ° C nitrogen atmosphere, and the draft percentage is controlled at -3%;

[0062] The tensile strength of the obtained carbon fiber 1 is 5.5 GPa, and the tensile modulus is 290 ...

Embodiment 2

[0063] Example 2: Carbon Fiber 2

[0064] The polyacrylonitrile precursor was passed through a modification bath, and the weight percentages of epoxy-modified silicone oil (purchased from Ningbo Runhe Chemical Industry Co., Ltd.) and ammonium pentaborate in the bath were 5% and 6%, respectively, and the rest was water. When passing through the bath, the temperature is 30°C, and the residence time is 0.5min;

[0065] Then enter the preoxidation furnace, respectively stay 10min at 220, 230, 240, and 260° C., and the percentage of drawing is controlled at 5%, 3%, 1%, and 1% respectively;

[0066] Then carry out low-temperature carbonization treatment under nitrogen atmosphere at 300-800°C, and control the drafting percentage at 5%;

[0067] Then carry out high-temperature carbonization treatment under 1700 ° C nitrogen atmosphere, and the draft percentage is controlled at -3%;

[0068] The obtained carbon fiber 2 has a tensile strength of 5.3 GPa and a tensile modulus of 280 GP...

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Abstract

The invention relates to a preparation method of high-performance polyacrylonitrile-based carbon fibers. Specifically, the invention discloses a pretreatment reagent for polyacrylonitrile protofilament and a pretreatment method employing the same, wherein the reagent contains an oiling agent and ammonium pentaborate. The pretreatment method can effectively shorten the pre-oxidation time, and significantly improves the mechanical properties of the final carbon fibers.

Description

technical field [0001] The invention relates to the technical field of carbon fiber preparation, in particular to a method for preparing high-performance polyacrylonitrile-based carbon fibers, and more particularly to a pre-oxidation pretreatment method for polyacrylonitrile-based carbon fiber precursors. Background technique [0002] Carbon fiber has many excellent properties such as low density, high specific strength, high specific modulus, high temperature resistance and corrosion resistance, and has been widely used in various fields of aerospace, national defense and civilian industries. According to the raw material route, carbon fiber can be divided into three types: polyacrylonitrile (PAN)-based, pitch-based and viscose-based. Among them, PAN-based carbon fiber has become a carbon fiber with the fastest development, the highest output, the most varieties and the widest application due to its simple production process, low production cost and excellent mechanical pro...

Claims

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Application Information

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IPC IPC(8): D06M15/643D06M15/65D06M15/647D06M11/82D01F9/22
Inventor 欧阳琴陈友汜莫高明黄显雯马洪波杨建行
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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