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Production method of carbon fiber

A production method, carbon fiber technology, applied in fiber chemical characteristics, wet spinning, textiles and papermaking, etc., can solve problems such as low apparent viscosity, low strength, and strict production requirements

Inactive Publication Date: 2013-11-27
THE NORTHWEST RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong effect of adjacent cyano groups in the highly regular PAN molecular chains, the molecular chains are arranged in a "helical" structure, and the structural arrangement is regular, so that the force between the molecular chains is reduced, and the apparent viscosity is small after being dissolved in DMSO. , poor spinnability, using nitric acid as a solvent will complicate the production process and have very strict requirements for production
[0005] In order to solve the technical problems that the high-regularity polyacrylonitrile polymer spinning process is complicated, and the thermal stability of the PAN precursor is not high in the pre-oxidation process, the carbonization yield of the final fiber is low and the strength is not high, so the present invention On the basis of summarizing the prior art, people have finally completed the present invention through a large number of experimental studies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Example 1: Production of carbon fibers

[0106] The implementation steps of this embodiment are as follows: The equipment used in this embodiment is the same as that of Embodiment 1.

[0107] A. Preparation of spinning solution

[0108] Let 17 parts by weight of high isotacticity polyacrylonitrile resin of 38% and 95 parts by weight of ordinary polyacrylonitrile resin in a high-speed mixer sold by German IKA company under the trade name LR-2.ST reactor at a rotating speed of 2800rpm. Pulverize and mix for 0.8 min under the conditions, then add 355 parts by weight of solvent dimethyl sulfoxide to the mixed resin, stir and mix, then swell for 6 hours at a temperature of 60 ° C, and then heat up to 70 ° C, dissolve at this temperature for 10 hours , then a mixed resin solution is obtained, and its solid content is 22% by the total weight of the mixed resin solution;

[0109] Next, use the defoaming kettle sold by Yangzhou Hengderong Equipment Manufacturing Co., Ltd. unde...

Embodiment 2

[0125] Example 2: Production of carbon fibers

[0126] The implementation steps of this embodiment are as follows:

[0127] The equipment used in this example is the same as that used in Example 1.

[0128] A. Preparation of spinning solution

[0129] 10 parts by weight of high isotacticity polyacrylonitrile resin with 38% isotacticity and 90 parts by weight of ordinary polyacrylonitrile resin were pulverized and mixed for 1.0min in a high-speed mixer at a speed of 3200rpm, and then 400 parts by weight were added to the mixed resin. 2 parts of solvent dimethyl sulfoxide, stirred and mixed, then swollen for 8 hours at a temperature of 52 °C, then heated to 68 °C, and dissolved for 8 hours at this temperature, so a mixed resin solution was obtained, and its solid content was mixed. The total weight of the resin solution is 20%;

[0130] Next, use a defoaming kettle to deaerate the mixed resin solution under a pressure of 3.2 kPa, and then use a candle wick filter to filter, a...

Embodiment 3

[0146] Example 3: Production of carbon fibers

[0147] The implementation steps of this embodiment are as follows:

[0148] The equipment used in this example is the same as that used in Example 1.

[0149] A. Preparation of spinning solution

[0150] 17 parts by weight of high isotacticity polyacrylonitrile resin with 38% isotacticity and 83 parts by weight of ordinary polyacrylonitrile resin were pulverized and mixed for 1.2min in a high-speed mixer at a speed of 3000rpm, and then 335 parts by weight were added to the mixed resin. 2 parts of solvent dimethyl sulfoxide, stirred and mixed, then swollen for 6 hours at a temperature of 56°C, then heated to 72°C, and dissolved at this temperature for 6 hours, thus obtaining a mixed resin solution, the solid content of which was based on the mixed resin. The total weight of the solution is 23%;

[0151] Next, use a defoaming kettle to deaerate the mixed resin solution under a pressure of 3.4kPa, and then use a candle wick filte...

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Abstract

The invention relates to a production method of a carbon fiber. The production method comprises the following steps of: preparing a spinning solution; carrying out wet spinning; solidifying; previously oxidizing primary polyacrylonitrile resin fibers; carrying out low-temperature carbonization; carrying out high-temperature carbonization, and the like. The production method disclosed by the invention can be used for enhancing the regularity of a fiber molecular chain by mixing high-regularity polyacrylonitrile resin and common polyacrylonitrile resin, thereby enhancing the fiber crystallinity, enhancing the fiber compact degree, increasing the carbon network length of the final fiber molecular chain and enhancing the fiber strength. Compared with the carbon fiber in the prior art, the carbon fiber obtained by adopting the production method has the advantage that the tensile strength and the carbonization yield are respectively improved by more than 19.7% and 26.0%.

Description

【Technical field】 [0001] The invention belongs to the technical field of carbon fiber preparation. More specifically, the present invention relates to a method for producing carbon fibers. 【Background technique】 [0002] Carbon fiber is a new type of carbon material with a carbon content of more than 90% converted from organic fibers after a series of heat treatments. Carbon fiber not only has a series of excellent properties such as high specific strength and specific modulus, high electrical conductivity, low thermal expansion coefficient, high temperature resistance, corrosion resistance, creep resistance and self-lubrication, but also has the characteristics of flexibility and weaving of fibers. As a reinforcement of advanced composite materials, it has an irreplaceable role in defense fields such as aerospace, nuclear energy equipment, and stealth weapons. It has also been widely used in civil industries such as civil construction, transportation, and sports and leisur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F6/38D01D5/06
Inventor 张力陈黎张晓利王小安
Owner THE NORTHWEST RES INST OF CHEM IND
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