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Method for preparing high-performance polyacrylonitrile-based carbon fiber protofilament through dry spraying and wet spinning

A polyacrylonitrile-based carbon fiber and polyacrylonitrile spinning technology, which is applied in wet spinning, spinning solution preparation, fiber treatment, etc., can solve the problems of not improving production efficiency, increasing production cost, and complicated spinning process, etc. problem, to achieve the effect of improving production efficiency, easy control and simple process

Inactive Publication Date: 2010-06-30
ZHONGFU SHENYING CARBON FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its spinning process is complex, including a series of processes such as filtration, coagulation molding, water washing, hot water drawing, primary oiling, primary drying and densification, secondary oiling, secondary drying and densification, steam drafting and drying heat setting. , which leads to a significant increase in production costs
On the other hand, the spinning stock solution it uses is polyacrylonitrile resin with a molecular weight of 160,000 to 180,000. The stock solution has a very high viscosity, which makes spinning difficult, and the spinning speed is low, which affects the output and makes the production efficiency not improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The viscosity average molecular weight obtained by solution polymerization is 1.2×10 5 The polyacrylonitrile spinning dope, wherein the weight content of the polyacrylonitrile polymer is 20%, the spinning dope temperature is 60° C., and is filtered through a filter material with a mesh size of 0.5 μm. Spinning is carried out by dry-jet wet spinning, and the spinning stock solution is extruded through a metering pump and a spinneret, and passes through an air section with a distance of 3 cm. The temperature is 20° C. and the relative humidity is 70%.

[0043] The spinning dope filament enters the coagulation bath, and the spinneret is drawn 1.5 times, wherein the temperature of the first coagulation bath is 10°C, and the content of dimethyl sulfoxide in the coagulation bath is 65%; the second coagulation bath The temperature is 30° C., the content of dimethyl sulfoxide in the coagulation bath is 45%, and coagulated filaments are obtained.

[0044] The resulting coagulat...

Embodiment 2

[0047] The viscosity average molecular weight obtained by solution polymerization is 1.5×10 5 The polyacrylonitrile spinning dope, wherein the weight content of the polyacrylonitrile polymer is 25%, the spinning dope temperature is 60° C., and is filtered through a filter material with a mesh size of 5 μm. The dry-jet wet-spinning method is used for spinning. The spinning stock solution is extruded through a metering pump and a spinneret, and passes through an air section with a distance of 10 cm. The temperature is 30° C. and the relative humidity is 95%.

[0048] The spinning dope filament enters the coagulation bath, and the spinneret is drawn 1.8 times, wherein the temperature of the first coagulation bath is 25°C, and the content of dimethyl sulfoxide in the coagulation bath is 70%; the second coagulation bath The temperature is 35° C., the content of dimethyl sulfoxide in the coagulation bath is 50%, and coagulated filaments are obtained.

[0049] The obtained coagulate...

Embodiment 3

[0052] The viscosity average molecular weight obtained by solution polymerization is 2×10 4 The polyacrylonitrile spinning dope, wherein the weight content of polyacrylonitrile polymer is 15%, the spinning dope temperature is 60° C., and is filtered through a filter material with a mesh size of 0.5 μm. Spinning is carried out by dry-jet wet spinning. The spinning stock solution is extruded through a metering pump and a spinneret, and passes through an air section with a distance of 1 cm. The temperature is 10° C. and the relative humidity is 50%.

[0053] The spinning dope filament enters the coagulation bath, and makes the spinneret positively drawn 2.5 times, wherein the temperature of the first-stage coagulation bath is 0°C, and the content of dimethyl sulfoxide in the coagulation bath is 40%; the second-stage coagulation bath The temperature is 10° C., the content of dimethyl sulfoxide in the coagulation bath is 20%, and coagulated filaments are obtained.

[0054] The res...

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Abstract

The invention relates to a method for preparing high-performance polyacrylonitrile-based carbon fiber protofilament through dry spraying and wet spinning, which comprises the following steps: preparing a polyacrylonitrile spinning stock solution; filtering and metering the polyacrylonitrile spinning stock solution after the demonomerization and deaeration; squeezing obtained materials through a spinning jet for forming fine spinning streams for entering a coagulating bath for coagulating forming through an air section; and carrying out drafting, water washing, drying densification, steam drafting and drying hot forming to obtain the high-performance polyacrylonitrile-based carbon fiber. The fiber firstly passes through a section of air layer, and then enters the coagulating bath for spinning forming by a wet method. The fine streams of the spinning solution is in a cylindrical shape after leaving spinneret orifices under the action of the gas-liquid interface tension, a primary cuticular layer is formed, and the cuticular structure is smooth. The method has the advantages of simple process, easy control and relatively low cost. In addition, the method also has the advantages that the spinning speed is high, the production efficiency can be improved, in addition, the surface of the obtained protofilament is smooth, the residual quantity of the solvents is greatly reduced, the quality homogenization degree of the protofilament is improved, and the mechanical property is excellent.

Description

[0001] Field [0002] The invention relates to a method for preparing fiber precursors, in particular to a method for preparing high-performance polyacrylonitrile-based carbon fiber precursors by dry spraying and wet spinning. Background of the invention [0003] Carbon fiber has a series of 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. It can be used not only as a reinforcing agent for structural materials, but also as a functional material. It is widely used in aerospace, construction, sports, automotive, medical and other fields. [0004] High-performance polyacrylonitrile-based carbon fiber precursor is the premise of producing high-performance carbon fiber, which is a conclusion recognized by scholars at home and abroad. As the polyacrylonitrile precursor of high-performance ...

Claims

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Application Information

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IPC IPC(8): D01D5/06D01D1/02D01D1/10D01D10/06D01D11/00
Inventor 张国良李怀京刘宣东金亮梁燕
Owner ZHONGFU SHENYING CARBON FIBER
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