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Preparation method of quaternary ammoniated and modified polyacrylonitrile-based protofilaments and carbon fibers

A technology of polyacrylonitrile-based raw silk and carbon fiber, which is applied to the chemical characteristics of fibers, complete sets of equipment for producing rayon, and single-component synthetic polymer rayon, etc., can solve the problems of harsh process conditions and complicated process, and achieve Effects of high degree of homogenization, increased elongation at break, improved rheological properties and stability

Inactive Publication Date: 2013-07-10
XIAN KANGBEN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the cumbersome technological process and the harsh technological conditions existing in the prior art, the present invention proposes a method for preparing quaternary ammoniated modified polyacrylonitrile-based precursors and carbon fibers

Method used

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  • Preparation method of quaternary ammoniated and modified polyacrylonitrile-based protofilaments and carbon fibers

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Embodiment 1

[0035] This embodiment is a preparation method of a quaternary ammoniated modified polyacrylonitrile-based precursor and carbon fiber. The specific process is:

[0036] Step 1, the preparation of spinning solution

[0037] The spinning solution is a quaternary copolymerization spinning solution, which is prepared by free radical solution polymerization. Specifically, AN, MA, IA, AS and AIBN are used as solutes, and DMSO is used as a solvent to prepare a reaction solution. The weight ratio of AN, MA, IA, AS is 98.00:0.75:1.00:0.25; the concentration of AIBN in the solute is 0.9wt%; the concentration of the solute in the reaction solution is 21.6wt%.

[0038] The reaction solution is pumped into the polymerization kettle through the pipeline to carry out the polymerization reaction. During the whole polymerization process, ammonia gas with a pressure of 0.2Mpa was introduced into the polymerization kettle through the ammonia gas pipeline at the bottom of the polymerization kettl...

Embodiment 2

[0069] This embodiment is a preparation method of a quaternary ammoniated modified polyacrylonitrile-based precursor and carbon fiber. The specific process is:

[0070] Step 1, the preparation of spinning solution

[0071] The spinning solution is a quaternary copolymerization spinning solution, which is prepared by free radical solution polymerization. The specific method is to prepare a reaction solution by using AN, MA, IA, AS and AIBN as solutes and DMSO as a solvent. The weight ratio of AN, MA, IA, AS is 97.60:0.95:1.15:0.30; the concentration of AIBN in the solute is 0.9wt%; the concentration of the solute in the reaction solution is 21.0wt%.

[0072] The reaction solution is pumped into the polymerization kettle through the pipeline to carry out the polymerization reaction. During the whole polymerization process, ammonia gas with a pressure of 0.2Mpa was introduced into the polymerization kettle through the ammonia gas pipeline at the bottom of the polymerization ket...

Embodiment 3

[0100] This embodiment is a preparation method of a quaternary ammoniated modified polyacrylonitrile-based precursor and carbon fiber. The specific process is:

[0101] Step 1, the preparation of spinning solution

[0102] The spinning solution is a quaternary copolymerization spinning solution, which is prepared by free radical solution polymerization. The specific method is to prepare a reaction solution by using AN, MA, IA, AS and AIBN as solutes and DMSO as a solvent. The weight ratio of AN, MA, IA, AS is 98.00:0.80:0.95:0.25; the concentration of AIBN in the solute is 0.9wt%; the concentration of the solute in the reaction solution is 20.9wt%.

[0103] The reaction solution is pumped into the polymerization kettle through the pipeline to carry out the polymerization reaction. During the whole polymerization process, ammonia gas with a pressure of 0.2Mpa was introduced into the polymerization kettle through the ammonia gas pipeline at the bottom of the polymerization ket...

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Abstract

The invention provides a preparation method of quaternary ammoniated and modified polyacrylonitrile-based protofilaments and carbon fibers. The preparation method comprises the following steps of: preparing a reaction solution by taking AN (Acrylic Nitrile), MA, IA, AS and AIBN (2,2-azobisisobutyronitrile) as solutes and taking DMSO (Dimethylsulfoxide) as a solvent; carrying out polymerization reaction on the obtained reaction solution and carrying out vacuum dynamic monomer-removing and de-foaming to obtain a ammoniated and modified spinning solution; and carrying out condensation and molding, hot water stretching, three times of oil feeding, steam stretching and sizing, pre-oxidization and carbonization treatment on the obtained spinning solution to obtain the carbon fibers. According to the preparation method disclosed by the invention, a reasonable formula and reasonable technical parameters are adopted so that the homogenizing degree of the obtained raw spinning solution is high in the condensation and molding process, and the strength of the protofilaments is improved. According to the preparation method disclosed by the invention, the strength and the modulus of the carbon fibers are greatly improved, the variable coefficient becomes small and the hook strength of the carbon fibers is obviously improved.

Description

technical field [0001] The invention relates to the field of carbon fiber preparation, in particular to a method for preparing high-performance polyacrylonitrile-based (PAN) precursors and carbon fibers. Background technique [0002] Carbon fiber has comprehensive excellent properties such as light weight, high strength, high modulus, heat conduction, high temperature resistance, corrosion resistance, and low expansion. It is an ideal component of ablation-resistant functional composite materials and structural composite materials. Aerospace high-tech cutting-edge fields such as space shuttles and civil aircraft are playing an increasingly important role, and are important basic materials for the sustainable development of the national economy. [0003] PAN-based carbon fiber is the mainstream of current R&D, production and application, and high-quality PAN precursor is the key to the preparation of high-quality carbon fiber, because any surface or internal defects of the pr...

Claims

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Application Information

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IPC IPC(8): D01F6/38D01F11/06D01F9/22D01D13/00
Inventor 李崇俊张善营吴斌张鹏张玲
Owner XIAN KANGBEN MATERIAL
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