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Middle-modulus carbon fiber preparation method based on rapid spinning and high denier precursor

A carbon fiber and high denier technology, which is applied in the field of high-performance carbon fiber preparation, can solve the problems of lower tensile strength and high cost of carbon fiber in the middle mold, and achieve the effect of less holes, less surface defects, and rapid pre-oxidation

Inactive Publication Date: 2016-03-16
ZHONGFU SHENYING CARBON FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to aim at the defects and insufficiencies of the prior art, to provide a reasonably designed method for preparing medium-mode carbon fibers based on rapid spinning and high-denier filaments, to realize synchronous improvement of the tensile modulus and strength of carbon fibers, and to solve the problem of The key issues of low tensile strength and high cost of medium-molded carbon fiber

Method used

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specific Embodiment approach 1

[0019] The technical scheme that this specific embodiment adopts is: its preparation method is as follows:

[0020] Put the PAN precursor with a fineness of 1.05dtex and a specification of 12K into a pre-oxidation furnace for pre-oxidation. The pre-oxidation temperature is 260°C, the pre-oxidation time is 45 minutes, the pre-oxidation draft rate is -10%, and the stock solution is fine. After the stream is sprayed out, give it 2-5 times the positive draft, and the fine stream realizes the molecular chain orientation and fine denier under the action of the uniaxial draft force, and the density of the pre-oxidized fiber body is 1.342g / cm3; The pre-oxidized fiber body with a density of 1.342g / cm3 is placed in a low-temperature carbonization furnace for double diffusion and phase separation in a low-temperature, low-concentration coagulation bath. The time is 60s, and the grade of the obtained low-temperature carbonized fiber body is level 1; after washing, water drawing and densif...

specific Embodiment approach 2

[0022] The technical scheme that this specific embodiment adopts is: its preparation method is as follows:

[0023] Put the PAN precursor with a fineness of 1.16dtex and a specification of 12K into a pre-oxidation furnace for pre-oxidation. The density of the fiber body is 1.345g / cm3; put the pre-oxidized fiber body with a density of 1.345g / cm3 into a low-temperature carbonization furnace for low-temperature carbonization, the temperature of low-temperature carbonization is 780°C, the draft rate is 3%, and the low-temperature carbonization time is 60s, the obtained low-temperature carbonized fiber body paralleled grade is 1.5; put the 1.5-level low-temperature carbonized fiber body paralleled into a high-temperature carbonization furnace for high-temperature carbonization, the temperature of high-temperature carbonization is 1800 ° C, and the draft rate is -4.5% , the high temperature carbonization time is 70s, the tensile strength of the obtained carbon fiber is 4900Mpa, and ...

specific Embodiment approach 3

[0024] The technical solution adopted in this specific embodiment is: its preparation method is as follows: put the PAN precursor with a fiber size of 1.18dtex and a specification of 12K into a pre-oxidation furnace for pre-oxidation, the pre-oxidation temperature is 265°C, and the pre-oxidation The time is 45min, the pre-oxidation stretch rate is -8%, and the density of the pre-oxidized fiber body is 1.338g / cm3; the pre-oxidized fiber body with a density of 1.338g / cm3 is put into a low-temperature carbonization furnace for low-temperature carbonization, and the low-temperature carbonization The temperature is 760°C, the draft rate is 5%, and the low-temperature carbonization time is 60s. The grade of the obtained low-temperature carbonized fiber body is 2nd grade; put the 2nd-level paralleled low-temperature carbonized fiber body into a high-temperature carbonization furnace for high-temperature carbonization , the high temperature carbonization temperature is 1750°C, the draf...

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Abstract

The invention discloses a middle-modulus carbon fiber preparation method based on rapid spinning and high denier precursor, and belongs to the field of high-performance carbon fiber preparation method. The middle-modulus carbon fiber preparation method comprises following steps: PAN precursor is delivered into a pre-oxidation furnace for pre-oxidation so as to obtain a pre-oxidized fiber body with a density ranging from 1.33 to 1.36g / cm<3>; the pre-oxidized fiber body is delivered into a low temperature carbonization furnace for low temperature carbonization so as to obtain a low temperature carbonized fiber body; the low temperature carbonized fiber body is delivered into a high temperature carbonization furnace for high temperature carbonization, and the carbon fiber with tensile strength ranging from 4500 to 5100MPa, tensile modulus ranging from 270 to 310GPa, and filament diameter ranging from 6 to 10<mu>m is obtained via carbonization. The middle-modulus carbon fiber preparation method is capable of realizing synchronous increasing of carbon fiber tensile modulus and strength, and solving key problems that the tensile strength of middle-modulus carbon fiber is reduced, and cost is high.

Description

technical field [0001] The invention relates to the field of preparation methods of high-performance carbon fibers, in particular to a method for preparing middle-mold carbon fibers based on rapid spinning and high-denier filaments. Background technique [0002] Modulus is one of the most important performance indicators of carbon fiber. It is the primary consideration parameter for composite material design. As a reinforcing material, the modulus of composite material is mainly provided by carbon fiber, which directly determines the dimensional stability and deformation resistance of composite structural parts. There are many factors affecting the tensile modulus of carbon fibers, among which the degree of orientation of the precursor and the carbonization temperature have the greatest influence on the modulus. On the one hand, the precursors with high degree of orientation and regularity are easy to obtain carbon fibers with high modulus. On the other hand, The higher the ...

Claims

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Application Information

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IPC IPC(8): D01F9/22
CPCD01F9/22
Inventor 连峰郭鹏宗张家好杨平欧阳新峰
Owner ZHONGFU SHENYING CARBON FIBER
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