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Pretreatment method of polyacrylonitrile base carbon fiber precursor

A technology of polyacrylonitrile-based carbon fiber and polyacrylonitrile, which is applied in fiber processing, fiber chemical characteristics, textiles and papermaking, etc., can solve problems such as radiation hazards, heavy metal pollution, organic reagent pollution, etc., and reduce industrial energy consumption and reduce The effect of releasing heat and lowering the initial temperature

Inactive Publication Date: 2012-10-10
FUDAN UNIV
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  • Abstract
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Problems solved by technology

[0005] However, these pretreatment methods have certain shortcomings, that is, heavy metal pollution, organic reagent pollution and radiation hazards will be caused during the pretreatment process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 11

[0021] Soak the PAN precursor in a lysine solution with a mass percentage concentration of 7% for 10 minutes, the soaking temperature is 55°C, and then dry it under normal temperature and pressure;

[0022] Pre-oxidize the treated PAN precursor in the air atmosphere, the temperature rises from room temperature to 350°C, and the pre-oxidation time is controlled at about 0.5h;

[0023] The starting temperature of cyclization of polyacrylonitrile obtained by the above steps is 225.3° C., and the exothermic heat of preoxidation is 1072 J / g.

Embodiment 12

[0025] Soak the PAN precursor in a lysine solution with a mass percentage concentration of 7% for 30 minutes, the soaking temperature is 55°C, and then dry it under normal temperature and pressure;

[0026] Pre-oxidize the treated PAN precursor in the air atmosphere, the temperature rises from room temperature to 350°C, and the pre-oxidation time is controlled at about 0.5h;

[0027] The starting temperature of cyclization of polyacrylonitrile obtained by the above steps is 151.7° C., and the exothermic heat of preoxidation is 891.8 J / g.

Embodiment 13

[0029] Soak the PAN precursor in a lysine solution with a mass percentage concentration of 25% for 30 minutes, the soaking temperature is 85°C, and then dry it under normal temperature and pressure;

[0030] Pre-oxidize the treated PAN precursor in the air atmosphere, the temperature rises from room temperature to 350°C, and the pre-oxidation time is controlled at about 0.5h;

[0031] The starting temperature of polyacrylonitrile cyclization obtained according to the above steps is 139.4° C., and the exothermic heat of preoxidation is 754.8 J / g.

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Abstract

The invention belongs to the technical field of carbon fiber preparation, and particularly relates to a pretreatment method of polyacrylonitrile base carbon fiber precursor. In the method, the polyacrylonitrile base carbon fiber precursor needing pre-oxidation is soaked for a certain time in an amino acid solution with concentration of 7-30% by mass, wherein the amino acid comprises lysine and arginine, and the soaking temperature is 25-85 DEG C. Through the invention, the technical problems of complicated operation, environmental pollution and the like of the existing precursor pretreatment technology are solved. The method provided by the invention is simple to operate and pollution-free, can effectively reduce the starting temperature of the cyclization reaction, reduces the heat discharge in the pre-oxidation process, and avoids the fusion bonding of the precursor in the subsequent treatment processes.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber preparation, and in particular relates to a pretreatment method for polyacrylonitrile-based carbon fiber precursors. Background technique [0002] Carbon fiber is a new type of carbon material with many excellent properties, such as high tensile strength and high elastic modulus, high temperature and low temperature resistance, and very good acid and corrosion resistance. It has been widely used in the aerospace field, Civil engineering field, industrial field and leisure and entertainment field. Common raw materials for preparing carbon fibers are divided into three types: polyacrylonitrile precursors, viscose-based precursors and pitch-based precursors. Among them, polyacrylonitrile-based precursors are the most widely used and are often used to prepare high-performance carbon fibers. [0003] The preparation process of carbon fiber can be divided into three stages: pre-oxidation stage, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/342D06M13/432D01F9/22
Inventor 何军坡杨玉良马占玲
Owner FUDAN UNIV
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