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Preparation process of mesophase pitch based protofilament continuous filament

A mesophase pitch and preparation process technology, which is applied in filament forming treatment, filament/wire forming, spinneret assembly, etc., can solve the difficulties of post-processing, low production efficiency of mesophase pitch, and low performance of raw silk and other problems, to achieve the effect of reducing hole defects, reducing friction, and reducing contact area

Inactive Publication Date: 2018-08-10
西安天运新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a mesophase pitch-based precursor continuous filament preparation process, based on high polymer melt spinning, to solve the technical problems of low mesophase pitch production efficiency, low precursor performance, and difficult post-processing

Method used

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  • Preparation process of mesophase pitch based protofilament continuous filament

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1: Grind and pulverize the mesophase pitch, and send it to the screw extruder through the feeder.

[0043] Step 2: The mesophase pitch is mixed and melted through multiple heating zones of the screw extruder, and the screw heating temperature of the extruder is 130-310°C. The temperature in the initial zone is 20°C lower than the temperature at which the mesophase pitch begins to oxidize, and the temperature in the final temperature zone is 310°C, which is higher than the softening point of the mesophase pitch and 20°C lower than the spinning temperature. After the final zone, a suction port is set, and the vacuum degassing after the final temperature zone of the screw extruder is opened, and the pressure of the degassing degassing is -0.1MPa.

[0044] Step 3: The screw extruder sends the melted and defoamed melt to the metering pump, and the pressure before the pump is kept between 1.5 and 2 MPa. The melt is accurately metered and delivered to the spinning assemb...

Embodiment 2

[0050] Step 1: Grind and pulverize the mesophase pitch, and send it to the screw extruder through the feeder.

[0051] Step 2: The mesophase pitch is mixed and melted through multiple heating zones of the screw extruder, and the heating temperature is 130-310°C. The temperature in the initial zone is 20°C lower than the temperature at which the mesophase pitch begins to oxidize, and the temperature in the final temperature zone is 310°C, which is higher than the softening point of the mesophase pitch and 20°C lower than the spinning temperature. After the final zone, a suction port is set, and the vacuum degassing after the final temperature zone of the screw extruder is opened, and the pressure of the degassing degassing is -0.1MPa.

[0052] Step 3: The screw extruder sends the melted and defoamed melt to the metering pump, and the pressure before the pump is kept between 1 and 1.3 MPa. The melt is accurately metered and delivered to the spinning assembly by a metering pump ...

Embodiment 3

[0067] Step 1: Send the pulverized mesophase pitch to the screw extruder through the feeder;

[0068] Step 2: The screw of the extruder heats the mesophase pitch, and sets an air extraction port after the final zone, and degasses under pressure during the operation of the screw; wherein, the heating temperature of the screw of the extruder is 140-300°C, and the temperature of the initial zone is less than The temperature at which the mesophase pitch begins to oxidize is 10°C, and the temperature in the final temperature zone is 300°C, which is higher than the softening point of the mesophase pitch and lower than the spinning temperature of 30°C. The pressure for defoaming is -0.05MPa.

[0069] Step 3: The screw extruder sends the melted and defoamed melt to the metering pump, and the pressure before the pump is kept between 1.5 and 2 MPa. The melt is accurately metered and delivered to the spinning assembly by a metering pump and pressurized. The molten and defoamed melt is ...

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Abstract

The invention discloses a preparation process of a mesophase pitch based a protofilament continuous filament. The preparation process comprises the following steps of sending mesophase pitch into a screw extruder through a feeder; heating, by a screw of the extruder, the mesophase pitch, and carrying out reduced pressure deaeration when the screw runs; conveying, by the screw extruder, a melted and deaerated melt into a spinning component through a metering pump, spreading the melt into a spinneret through a spure spreader of the spinning component, and extruding through spinneret orifices ofthe spinneret to carry out spinning; oiling an extrusion-molded fiber bundle, drawing by a drawing roll, and then collecting the filament. A reduced pressure deaeration opening in the preparation process is located behind a final zone; on one hand, the melt in a melting zone can be prevented from being evacuated and broken down to cause that a suction gas is dissolved in the melt. The mesophase pitch is completely molten after passing through a screw melting zone, and is uniformly mixed under the shearing action of a twin screw to be capable of forming a layer of thin and uniform melt in a tank; at the moment, gas bubbles in the interior of the melt can be completely separated through the reduced pressure deaeration. The preparation process is good in production efficiency, and moreover, the prepared mesophase pitch based protofilament is good in performance.

Description

technical field [0001] The invention relates to the melt-spinning, bundling, drafting and winding of a mesophase pitch-based precursor continuous filament, in particular to a preparation process for a mesophase pitch-based precursor continuous filament. Background technique [0002] Carbon fiber and its composite materials have a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, creep resistance, electrical conductivity, heat transfer and small thermal expansion coefficient. It can not only be used as a structural material to carry composite materials, but also as a functional material to play other functions. According to the raw materials, carbon fiber is mainly divided into two types: polyacrylonitrile-based carbon fiber and pitch-based carbon fiber. Compared with polyacrylonitrile-based carbon fiber, the raw material of pitch-based carbon fiber is easy to obtain, the cost is lower, an...

Claims

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Application Information

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IPC IPC(8): D01D5/08D01D5/16D01F9/00D01D1/10D01D4/00D01D5/096D01D7/00
CPCD01D1/103D01D1/106D01D4/00D01D5/08D01D5/096D01D5/16D01D7/00D01F9/00
Inventor 胡琪
Owner 西安天运新材料科技有限公司
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