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Spinning solution of polyacrylonitrile-based carbon fibers

A technology of polyacrylonitrile-based carbon fiber and spinning dope, which is applied in the direction of spinning solution preparation, fiber chemical characteristics, single-component synthetic polymer rayon, etc., can solve problems such as gel and high viscosity of spinning dope, and achieve The effect of less gel content

Active Publication Date: 2012-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the existing spinning stock solution, when the content of the copolymer in the stock solution is 25-35%, there are problems such as high viscosity of the spinning stock solution and serious gel phenomenon. Spinning dope of acrylonitrile-based carbon fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Stock solution preparation method: the spinning stock solution involved in the present invention is prepared by the following method, adding the solvent, the first monomer acrylonitrile, the second monomer itaconic acid, and the initiator into the reaction kettle, and the reaction substance is protected by an inert gas. The reaction is carried out, and then the residual monomer and air bubbles are removed to obtain a polyacrylonitrile copolymer spinning dope.

[0017] The obtained polyacrylonitrile-based carbon fiber spinning dope consists of: 75% N, N-dimethylformamide as a solvent, 25% acrylonitrile and itaconic acid copolymer, wherein acrylonitrile accounts for 99% of the total monomer %, itaconic acid accounted for 1% of the total monomer, and the copolymer was initiated with 0.6% azobisisoheptanonitrile. The spinning stock solution has a molecular weight of 63,000, a molecular weight distribution of 2.71, a spinning stock solution viscosity of 91 Pa·s, and a low ge...

Embodiment 2

[0019] The stock solution prepared according to the preparation method of Example 1 is composed of: 70% of N,N-dimethylformamide as solvent, 30% of acrylonitrile and itaconic acid copolymer, wherein acrylonitrile accounts for the total monomer 99%, itaconic acid accounted for 1% of the total monomers, and the copolymer was initiated with 0.6% azobisisoheptanonitrile. The spinning stock solution has a molecular weight of 73,000, a molecular weight distribution of 2.53, a spinning stock solution viscosity of 132 Pa·s, and a low gel content in the spinning stock solution, which can be filtered through a 1 μm filter membrane.

Embodiment 3

[0021] The stock solution prepared according to the preparation method of Example 1 is composed of: 65% of N,N-dimethylformamide as solvent, 35% of acrylonitrile and itaconic acid copolymer, wherein acrylonitrile accounts for the total monomer 99%, itaconic acid accounted for 1% of the total monomers, and the copolymer was initiated with 0.6% azobisisoheptanonitrile. The spinning stock solution has a molecular weight of 75,000, a molecular weight distribution of 2.76, a spinning stock solution viscosity of 146 Pa·s, and a low gel content in the spinning stock solution, which can be filtered through a 1 μm filter membrane.

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PUM

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Abstract

The invention relates to a novel spinning solution of polyacrylonitrile-based carbon fibers to mainly problems of too large viscosity and easy gel generation of spinning solutions in the prior art. The spinning solution of the polyacrylonitrile-based carbon fibers comprises the following components, by weight, 65-75 parts of N,N-dimethyl formamide, and 25-35 parts of a copolymer, wherein the copolymer is obtained through carrying out a one step method on a first monomer acrylonitrile and a second monomer itaconic acid in the presence of an initiator azobisisoheptonitrile. The solution prepared through adopting above technical scheme well solves the problems, and can be applied to the industrial production of carbon fiber precursors.

Description

technical field [0001] The invention relates to a spinning stock solution of polyacrylonitrile-based carbon fiber. Background technique [0002] Polyacrylonitrile (PAN)-based carbon fiber is a new type of material developed rapidly in the 1960s, because of its light weight, high specific strength, high specific modulus, high temperature resistance, corrosion resistance, wear resistance, fatigue resistance, electrical conductivity, thermal conductivity, etc. It is widely used in military industries such as satellites, launch vehicles, tactical missiles, and spacecraft, and has become an indispensable material in the aerospace industry. Excellent carbon fiber precursors should have the characteristics of high heat resistance, less pore structure, less surface defects, dense structure, and good stretchability. [0003] The initial copolymer structure and properties determine the final carbon fiber structure and properties. Therefore, starting from the synthesis of polyacrylon...

Claims

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Application Information

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IPC IPC(8): D01F6/38D01F9/22C08F220/46D01D1/02
Inventor 屠晓萍沈志刚史纪友周文乐
Owner CHINA PETROLEUM & CHEM CORP