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Method for preparing carbon fibers from acrylic fibers

A technology of carbon fiber and acrylic fiber, which is applied in the field of carbon fiber preparation, can solve the problems of high corrosiveness of mixed acid equipment, inapplicability to actual production, and influence on the performance of carbon fiber, so as to reduce the initial temperature of thermal stabilization reaction, suitable for large-scale production, The effect of short modification time

Active Publication Date: 2015-07-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods have certain effects in improving the thermal properties of polyacrylonitrile precursors, the use of KMnO 4 solution, NiSO 4 The solution method introduces impurity ions, which are not easy to remove during the pre-oxidation and carbonization process and form defects, which affect the performance of carbon fibers; the method of mixed acid modification is easy to cause damage to the fiber surface and form defects, and the mixed acid is harmful to equipment. Corrosive, so these methods are not suitable for actual production

Method used

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  • Method for preparing carbon fibers from acrylic fibers
  • Method for preparing carbon fibers from acrylic fibers
  • Method for preparing carbon fibers from acrylic fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) adopt dry jet wet spinning or wet spinning technology to prepare acrylic fiber;

[0034] (2) configuration mass percentage concentration is the guanidine hydrochloride aqueous solution of 0.5%;

[0035] (3) Immerse a bundle of acrylic fibers prepared in step (1) into the guanidine hydrochloride aqueous solution, and keep it in a constant temperature water bath at 60° C. for 10 minutes, then take out the acrylic fibers and dry them at 60° C.

[0036] Adopt thermal analyzer (DSC) to carry out thermal performance analysis to the acrylic fiber that step (1) makes and the acrylic fiber after step (3) process, the result is as follows figure 1 shown, from figure 1 It can be seen from the figure that the thermal stabilization reaction initiation temperature of the acrylic fibers not modified by guanidine hydrochloride is 260°C, while the thermal stabilization reaction initiation temperature of the acrylic fibers modified by guanidine hydrochloride is greatly reduced, only...

Embodiment 2

[0041] (1) exactly the same as step (1) in embodiment 1, makes acrylic fiber;

[0042] (2) configuration mass percentage concentration is the ammonium acetate aqueous solution of 0.5%;

[0043] (3) Immerse a bundle of acrylic fiber in the ammonium acetate aqueous solution and keep it in a constant temperature water bath at 60°C for 10 minutes, then take out the acrylic fiber and dry it at 60°C.

[0044] Adopt thermal analyzer (DSC) to carry out thermal performance analysis to the acrylic fiber that step (1) makes and the acrylic fiber after step (3) process, the result is as follows image 3 shown, from image 3 It can be seen from the figure that the initial temperature of the thermal stabilization reaction of the acrylic fiber without ammonium acetate modification is 260°C, while the thermal stabilization reaction initiation temperature of the acrylic fiber modified with ammonium acetate is greatly reduced, only 200°C. up to 23%.

[0045] The non-ammonium acetate-modified...

Embodiment 3

[0050] (1) exactly the same as step (1) in embodiment 1, makes acrylic fiber;

[0051] (2) configuration mass percentage concentration is the ammonium formate aqueous solution of 1%;

[0052] (3) Immerse a bundle of acrylic fiber in the ammonium formate aqueous solution, and keep it in a constant temperature water bath at 80°C for 10 minutes, then take out the acrylic fiber and dry it at 80°C.

[0053] Adopt thermal analyzer (DSC) to carry out thermal performance analysis to the acrylic fiber that step (1) makes and the acrylic fiber after step (3) process, the result is as follows Figure 4 shown, from Figure 4 It can be seen from the figure that the thermal stabilization reaction initiation temperature of acrylic fiber without ammonium formate modification is 260°C, while the thermal stabilization reaction initiation temperature of acrylic fiber modified with ammonium formate is greatly reduced, only 200°C, lower The range is 23%.

[0054] The non-ammonium formate-modifi...

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Abstract

The invention provides a method for preparing carbon fibers from acrylic fibers. According to the method, the acrylic fibers are prepared by use of a dry-spraying wet spinning or wet spinning technique; the acrylic fibers are impregnated into an aqueous solution of ammonium acetate, ammonium formate, guanidine hydrochloride, ethylenediamine tetraacetic acid, triethylamine, urea, trimethylamine, dicyandiamide, normal hexyl amine, dihexylamine, cyanamide, amylamine, diethylamine, hexyldiamine, tert-butylamine or n-butylamine for modification for a certain time, and then dried, and finally, the acrylic fibers are pre-oxidized and carbonized to prepare the carbon fibers. Experiments prove that the modified acrylic fibers are capable of remarkably reducing the starting temperature of thermal stabilizing reaction of the acrylic fibers and expanding the exothermic peak, and therefore, the controllability of the pre-oxidation process can be improved, the low cost production of the carbon fibers is realized finally, and meanwhile, the strength and the elasticity modulus of the carbon fibers can be improved favorably to meet the requirements on the properties on the carbon fibers in the industrial areas.

Description

technical field [0001] The method relates to the technical field of carbon fiber preparation, in particular to a method for preparing carbon fiber by using acrylic fiber. Background technique [0002] Polyacrylonitrile (PAN)-based carbon fiber has a series of excellent properties such as light weight, high strength, high elastic modulus, corrosion resistance, high temperature resistance, and small thermal expansion coefficient. It has important application value in civil industry fields. However, the existing PAN-based carbon fiber production technology has the disadvantages of low output and high cost, which limits its application in the civil industry. Therefore, low cost has become one of the important directions of carbon fiber research and development today. [0003] In the production of PAN-based carbon fiber, the precursor accounts for about 51% of the total cost and is the most important factor affecting its cost. Therefore, the development of low-cost PAN precurso...

Claims

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Application Information

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IPC IPC(8): D01F9/22
Inventor 皇静欧阳琴管建敏王微霞钟俊俊李德宏杨建行
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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