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Preparation method for polyacrylonitrile-based carbon fiber protofilament

A polyacrylonitrile-based carbon fiber, polyacrylonitrile technology, applied in spinning solution preparation, fiber processing, fiber chemical characteristics, etc., to achieve the effect of reducing usage, uniform structure, and small fineness

Inactive Publication Date: 2011-06-22
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But adopt this kind of method, need to transform the existing spinning device

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Raw material: polyacrylonitrile, viscosity average molecular weight is 7.2×10 4 , is a terpolymer, wherein the mass percent of acrylonitrile is 95.6%, the mass percent of the second monomer methyl acrylate is 3.4%, and the third monomer itaconic acid is 1.0% by mass. The organic solvent is DMSO, and the additive is water.

[0041]In the DMSO / water mixture containing 5% of water (accounting for the total mass percentage of DMSO and water), add 20% (based on the weight percentage of the sum of each substance) polyacrylonitrile powder, swell at 25°C for 2 hours, and at 65°C Dissolve for 5 hours, prepare spinning solution, defoam and filter at 65°C, measure by metering pump, extrude from spinneret, pass through 1cm air layer, enter 10°C DMSO concentration of 40% DMSO / Coagulate and form in an ethanol coagulation bath. The coagulated silk is stretched in air at 25°C and humidity 60%, and then washed with water at 40°C. The water-washed silk enters hot water baths at 65°C ...

Embodiment 2

[0042] Embodiment 2 (comparative example 1, water is as non-solvent component)

[0043] Raw material: polyacrylonitrile, viscosity average molecular weight is 7.2×10 4 , is a terpolymer, wherein the mass percent of acrylonitrile is 95.6%, the mass percent of the second monomer methyl acrylate is 3.4%, and the third monomer itaconic acid is 1.0% by mass. The organic solvent is DMSO, and the additive is water.

[0044] In the DMSO / water mixture containing 5% of water (accounting for the total mass percentage of DMSO and water), add 20% (based on the weight percentage of the sum of each substance) polyacrylonitrile powder, swell at 25°C for 2 hours, and at 65°C Dissolve for 5 hours, prepare spinning solution, defoam and filter at 65°C, measure by metering pump, extrude from spinneret, pass through 1cm air layer, enter 10°C DMSO concentration of 40% DMSO / Solidified in a water coagulation bath. The coagulated silk is stretched in air at 25°C and humidity 60%, and then washed wi...

Embodiment 3

[0045] Embodiment 3 (comparative example 2, water is as non-solvent component)

[0046] Raw material: polyacrylonitrile, viscosity average molecular weight is 7.2×10 4 , is a terpolymer, wherein the mass percent of acrylonitrile is 95.6%, the mass percent of the second monomer methyl acrylate is 3.4%, and the third monomer itaconic acid is 1.0% by mass. The organic solvent is DMSO, and the additive is water.

[0047] In the DMSO / water mixture containing 5% of water (accounting for the total mass percentage of DMSO and water), add 20% (based on the weight percentage of the sum of each substance) polyacrylonitrile powder, swell at 25°C for 2 hours, and at 65°C Dissolve for 5 hours, prepare spinning solution, defoam and filter at 65°C, measure by metering pump, extrude from spinneret, pass through 1cm air layer, enter 10°C DMSO concentration of 70% DMSO / Solidified in a water coagulation bath. The coagulated silk is stretched in air at 25°C and humidity 60%, and then washed wi...

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Abstract

The invention relates to a preparation method for a polyacrylonitrile-based carbon fiber protofilament, comprising the following steps: firstly, polyacrylonitrile / organic solvent spinning solution is prepared; secondly, after defoaming, filter and metering, the spinning solution forms a spinning solution trickle by being extruded through a spinneret, and enters a coagulation bath to be shaped by coagulation through an air layer; and thirdly, air stretching, washing, prestretching, main stretching, dry collapse and steam stretching are carried out. The invention efficiently enhances the draft ratio of a strand silk during spinning, and can carry out scale production on the prior spinning plant, therefore, the prepared protofilament has uniform structure, little fibrousness and high strength.

Description

technical field [0001] The invention belongs to the field of preparation of carbon fiber precursors, in particular to a preparation method of polyacrylonitrile-based carbon fiber precursors. Background technique [0002] High-performance polyacrylonitrile-based carbon fiber has excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and small thermal expansion coefficient, and is ideal for the development of nuclear weapons, strategic missiles, The most important key material for advanced weapons and equipment such as satellites and aerospace vehicles, it is also widely used in civilian fields such as civil aviation airliners, civil construction, and sporting goods. It is an extremely important dual-use material for military and civilian purposes. The preparation process of high-performance polyacrylonitrile-based carbon fibers i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/00D01D1/02D01D10/00D01D10/06D01F6/54D02J1/22
Inventor 张幼维赵炯心张舰张德刚吴承训
Owner DONGHUA UNIV
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