Polyacrylonitrile-based hollow carbon fiber precursor and preparation method thereof

A polyacrylonitrile-based, carbon fiber precursor technology, applied in the direction of hollow filament manufacturing, rayon manufacturing, fiber chemical characteristics, etc., can solve the problem of limiting the output of hollow carbon fiber precursor and hollow carbon fiber, not being able to spin bundles, and not suitable Carbon fiber and other problems, to achieve the effect of large hollowness, good stability and excellent performance

Active Publication Date: 2010-07-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, one of the disadvantages of this method is that it uses a double-ring sleeve-shaped spinneret, which cannot be spun into bundles, which severely limits the o

Method used

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  • Polyacrylonitrile-based hollow carbon fiber precursor and preparation method thereof
  • Polyacrylonitrile-based hollow carbon fiber precursor and preparation method thereof
  • Polyacrylonitrile-based hollow carbon fiber precursor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A. According to the mass ratio of 98.8% acrylonitrile and 1.2% itaconic acid, put comonomer into the polymer kettle, then add solvent dimethyl sulfoxide (DMSO), control the mass concentration of monomer acrylonitrile in the polymerization system 22%, add initiator azobisisobutyronitrile (AIBN), the molar ratio of it and itaconic acid is 0.25: 99.75, react at a temperature of 60 ℃ for 24 hours, the polymer obtained is through de-monolysis and degassing, Made into spinning solution.

[0042] B. Conventionally extrude the spinning solution at 60°C±2°C, pass through a candle-shaped filter, and pass through a double C-shaped circular arc slit spinneret (the outer diameter of the spinneret hole is 480 μm, and the inner diameter of the spinneret hole is 320 μm) , the width at the center of the slit gap is the same as the width of the slit, and the number of holes is 94), the primary fiber is sprayed out, the coagulation draft is controlled at 0.7 times, and it is solidified in...

Embodiment 2

[0047] A, by mass ratio 94.3% acrylonitrile, 3.2% methyl acrylate and 2.5% itaconic acid, drop into comonomer in polymer still, add solvent dimethyl sulfoxide (DMSO) again, control monomer acrylonitrile The mass concentration of the polymerization system is 22%, adding the initiator azobisisobutyronitrile (AIBN), the molar ratio of it and itaconic acid is 0.25: 99.75, reacting at a temperature of 60° C. for 24 hours, and the polymer obtained by Single-degassing and degassing to make spinning solution.

[0048] B. The spinning solution is routinely extruded at 60°C ± 2°C, through a candle filter, from the double C-shaped circular arc slit spinneret (same as described in Example 1), the as-spun fibers are ejected and solidified The stretching is controlled at 0.8 times, and it enters into a coagulation bath with a temperature of 30°C±2°C for coagulation and molding, and the coagulation bath is the same as in Example 1.

[0049] C. According to step C of Example 1, polyacrylonit...

Embodiment 3

[0053] A, spinning solution preparation is the same as embodiment 1.

[0054] B. Conventionally extrude the spinning solution at 60°C±2°C, pass through a candle-shaped filter, and pass through a single C-shaped circular arc slit spinneret (the outer diameter of the spinneret hole is 480 μm, and the inner diameter of the spinneret hole is 320 μm) , the width at the center of the slit gap is the same as the width of the slit, and the number of holes is 94.), the primary fiber is sprayed out, the coagulation draft is controlled at 0.8 times, and it is coagulated into a coagulation bath with a temperature of 25 ° C ± 2 ° C. The coagulation bath is the same as Example 1.

[0055] C. After pre-drawing with hot water at 100°C, washing with water, drying, and then drawing with water vapor at 120°C, the total drafting of the two times is controlled at 12 times, and the polyacrylonitrile-based hollow carbon fiber precursor is obtained through heat setting.

[0056] The obtained hollow ...

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Abstract

The invention relates to a polyacrylonitrile-based hollow carbon fiber precursor and a preparation method thereof. The polyacrylonitrile-based hollow carbon fiber precursor of the invention can be used for preparing polyacrylonitrile-based hollow carbon fibers. An acrylonitrile binary copolymerization system containing itaconic acid or an acrylonitrile ternary polymerization system containing itaconic acid and methyl acrylate is adopted for spinning by a wet spinning process matched with a circular arc slit spinneret plate, and multiple filament bundles of the hollow carbon fiber precursor can be obtained, wherein the dimension of the outer diameter and the structure of the precursor meet the requirement of a conventional preoxidation carburizing process for precursor fibers, and the groove structure on the surface of the fiber is favorable for improving the interface performance of composite materials.

Description

Technical field: [0001] The invention relates to a polyacrylonitrile-based hollow carbon fiber precursor and a preparation method thereof. The polyacrylonitrile-based hollow carbon fiber precursor of the invention can be used for the preparation of polyacrylonitrile-based hollow carbon fibers. Background technique: [0002] Compared with solid carbon fiber prepared from the same raw material, hollow carbon fiber has light weight, good heat insulation, good insulation, high specific strength and large specific surface area, which can increase the bonding force between fiber and matrix, and the composite material reinforced with it has superior mechanical properties , is a promising functional structural reinforcement fiber. Polyacrylonitrile fiber is one of the most important precursors for manufacturing high-performance carbon fibers. At present, the mass production of solid polyacrylonitrile-based carbon fibers has been realized in serial products, and the technology is q...

Claims

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Application Information

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IPC IPC(8): D01F6/38D01F1/08D01F9/22D01D5/06D01D5/24
Inventor 徐樑华于洋李常清童元建赵振文杨新民
Owner BEIJING UNIV OF CHEM TECH
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