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Preparation method of 48K polyacrylonitrile-based carbon fiber

A technology of polyacrylonitrile-based carbon fiber and manufacturing method, which is applied in the field of manufacturing 48K polyacrylonitrile carbon fiber, which can solve problems such as increased viscosity of the system, slow heat transfer rate, uneven carbonization, etc., and achieves conditions that are easy to control and heat transfer rate Fast, less fluffing effect

Inactive Publication Date: 2017-05-10
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a 48KPAN in order to solve the problems of slow heat exchange rate caused by the increase of system viscosity in the late stage of polymerization reaction, concentrated heat release and uneven carbonization in the process of pre-oxidation and carbonization in the existing carbon fiber preparation technology. Manufacturing method of base carbon fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Acrylonitrile monomer 50% (Wt%), methyl acrylate 5% (Wt%), itaconic acid 1.5% (Wt%), ammonium persulfate 0.15% (Wt%), ammonium bisulfite 0.70 % (Wt%) and deionized water 42.65 (Wt%) were added to the polymerization kettle, and reacted for 4h at 60°C, and the obtained product was obtained after single removal, washing, and drying to obtain PAN-based carbon fiber precursors for polymerization Powder.

[0026] The obtained PAN-based carbon fiber precursor polymer powder is mixed with DMAC solvent at -18°C to form a slurry with a solid content of 16% (Wt%), vacuumed to 45KPa, heated to 45°C, and dissolved Obtain solid content after 1 hour and be the spinning dope (this solution can preserve 24 hours) of 16% (Wt%); Spinning dope is extruded in the coagulation bath by 48000 hole spinnerets after being heated to 70 ℃, coagulation bath The temperature is 50°C, the draw ratio is 0.96, the obtained as-spun fiber is washed and drawn 6 times in hot water at 80°C, and then washed a...

Embodiment 2

[0033]According to 40% (Wt%) of acrylonitrile monomer, 6% (Wt%) of methyl acrylate, 2.5% (Wt%) of itaconic acid, 0.50% (Wt%) of ammonium persulfate, and 0.45% of ammonium bisulfite by metering pump % (Wt%) and 50.55% (Wt%) of deionized water were added to the polymerization kettle, and reacted for 6h at 55°C, and the obtained product was obtained after single removal, washing, and drying to prepare PAN-based carbon fiber precursors for polymerization Powder.

[0034] The obtained PAN-based carbon fiber precursor polymer powder is mixed with DMAC solvent at -18°C to form a slurry with a solid content of 16% (Wt%), vacuumed to 65KPa, heated to 45°C, and dissolved Obtain solid content after 1 hour and be the spinning dope (this solution can preserve 24 hours) of 16% (Wt%); Spinning dope is extruded in the coagulation bath by 48000 hole spinnerets after being heated to 70 ℃, coagulation bath The temperature is 50°C, the draw ratio is 0.92, the obtained as-spun fiber is washed in ...

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Abstract

The invention discloses a preparation method of 48K polyacrylonitrile-based carbon fiber and belongs to the preparation technology of fiber in the textile science art. The method comprises steps as follows: fiber bundles are spread by a yarn spreading device, and precursor fibers are preoxidized at four temperature zones by means of a preoxidation furnace; preoxidized fibers are carbonized at six temperature zones and four temperature zones respectively by the aid of a low-temperature carbonization furnace and a high-temperature carbonization furnace respectively; finally, the 48K polyacrylonitrile-based carbon fiber is obtained through an oiling and drying technology. The precursor fibers for T300-level 48 K carbon fiber are prepared with a ternary water phase suspension polymerization and wet-process two-step technology. The technology is convenient to operate, equipment is simple, the production cost is low, the problems of non-uniform oiling and inconsistent drafting in the production process of large-tow carbon fiber, concentrated heat release at the peroxidation and carbonization stage and the like are solved, and the method is applicable to engineering production of large-tow polyacrylonitrile-based carbon fiber to obtain mechanical property parameters of the material and reduce microscopical deformation, damage and breakage of the material.

Description

technical field [0001] The invention belongs to the technical field of manufacturing large tow carbon fibers, and in particular relates to a method for manufacturing 48K polyacrylonitrile carbon fibers. Background technique [0002] Polyacrylonitrile-based carbon fiber is a high-performance new fiber material. It has a series of excellent properties such as high specific strength, high specific modulus, small thermal expansion coefficient, low density, high temperature resistance, and chemical corrosion resistance. It is used in aerospace, industrial energy, biological It is widely used in fields such as medicine and sports entertainment. [0003] The price of large tow PAN-based carbon fiber is much cheaper than that of small tow, which can greatly reduce the cost of carbon fiber composite materials, so it has great application prospects in the civilian field. The performance of the PAN precursor determines the quality of the final carbon fiber. At present, the production ...

Claims

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Application Information

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IPC IPC(8): D01F9/22C08F220/44C08F220/14C08F222/02C08F2/18D01F6/40D01D5/06
CPCD01F9/225C08F2/18C08F220/44D01D5/06D01F6/40C08F220/14C08F222/02
Inventor 敖玉辉孙立浩尚垒
Owner CHANGCHUN UNIV OF TECH
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