A kind of polyacrylonitrile base graphite fiber and preparation method thereof

A polyacrylonitrile-based, graphite fiber technology, applied in the field of fibers, can solve the problems of not being able to meet the high strength, high modulus mechanical performance indicators, low mechanical properties, and carbon fiber mechanical properties. Tensile strength decreased, etc., to achieve excellent dimensional stability. , The effect of low thermal expansion coefficient and tensile strength improvement

Active Publication Date: 2020-07-28
山西钢科碳材料有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, although graphitization of carbon fibers can greatly increase the tensile modulus of the fibers, it will lead to a significant decrease in other mechanical properties of carbon fibers, especially the tensile strength.
The so-called high-strength and high-modulus polyacrylonitrile-based carbon fibers in the prior art cannot simultaneously meet all the mechanical performance indicators of high strength and high modulus
For example, the mechanical indexes of polyacrylonitrile-based graphite fibers in the prior art are generally as follows: the linear density is 178-185g / km, the tensile strength is about 3.87GPa, and the tensile modulus is about 500GPa; The modulus of elongation meets the requirements of the high modulus index, and the indexes of other mechanical properties are low

Method used

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  • A kind of polyacrylonitrile base graphite fiber and preparation method thereof
  • A kind of polyacrylonitrile base graphite fiber and preparation method thereof
  • A kind of polyacrylonitrile base graphite fiber and preparation method thereof

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preparation example Construction

[0039] The preparation method of the above-mentioned polyacrylonitrile-based graphite fiber comprises the following steps: the raw silk is sequentially passed through an oxidation furnace, a low-temperature carbonization furnace, a high-temperature carbonization furnace, a graphitization furnace, electrolyte treatment, water washing, a drying furnace body 1, sizing, and a drying furnace body 2. Finally, the yarn is collected; each process section of the whole line is given proper drafting, which is realized through the transmission of the frequency conversion drafting machine. Continuous mass production can be realized; 5-100 bundles of raw silk can be run at the same time.

[0040] Specifically, the detailed preparation steps are as follows:

[0041] 1) Pre-oxidation: pre-oxidize the raw silk to obtain pre-oxidized fiber body.

[0042] In the pre-oxidation step, the raw silk is sequentially subjected to pre-oxidation treatment through 4 to 6 oxidation temperature zones; wher...

Embodiment 1

[0098] Choose a diameter of 9.0μm and a bulk density of 1.181g / cm 3 6K polyacrylonitrile fiber precursors with a linear density of 510g / Km, an average groove depth of 0.2 μm, an average width of 0.4 μm, and an average surface roughness Ra of 0.0182 μm;

[0099] The raw silk goes through oxidation furnace, low-temperature carbonization furnace, high-temperature carbonization furnace, graphitization furnace, electrolyte treatment, water washing, drying furnace body 1, sizing, drying furnace body 2, and finally winding and forming. Proper drafting is given to each process section of the whole line, which is realized through the transmission of the frequency conversion drafting machine. Specific steps are as follows:

[0100] 1) Pre-oxidation: Pre-oxidized fibers are obtained by making the precursor enter the first oxidation temperature zone of 195°C, the second oxidation temperature zone of 215°C, the third oxidation temperature zone of 227°C and the fourth oxidation temperature...

Embodiment 2

[0115] Choose a diameter of 9.0μm and a bulk density of 1.181g / cm 3 6K polyacrylonitrile fiber precursors with a linear density of 510g / Km, an average groove depth of 0.5 μm, an average width of 0.4 μm, and an average surface roughness Ra of 0.0194 μm;

[0116] The raw silk goes through oxidation furnace, low-temperature carbonization furnace, high-temperature carbonization furnace, graphitization furnace, electrolyte treatment, water washing, drying furnace body 1, sizing, drying furnace body 2, and finally winding and forming. Proper drafting is given to each process section of the whole line, which is realized through the transmission of the frequency conversion drafting machine. Specific steps are as follows:

[0117] 1) Pre-oxidation: Pre-oxidized fibers are obtained by making the precursor enter the first oxidation temperature zone of 195°C, the second oxidation temperature zone of 215°C, the third oxidation temperature zone of 227°C and the fourth oxidation temperature...

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Abstract

The invention discloses a polyacrylonitrile-based graphite fiber and a preparation method thereof. According to a main technical scheme, the polyacrylonitrile-based graphite fiber has the tension strength of 4.01-4.46GPa, a tension modus of 541-547PGa and a bulk density of 1.89-1.91g / cm<3>; and the linear density of a 6K polyacrylonitrile-based graphite fiber is 215-218g / km. The preparation methodof the polyacrylonitrile-based graphite fiber comprises the following step: carrying out pre-oxidation, low-temperature carbonization, high-temperature carbonization, graphitization and aftertreatment on protofilaments in sequence, so as to obtain the polyacrylonitrile-based graphite fiber, wherein the protofilaments are polyacrylonitrile fibers; the diameter of a single protofilament is 9-11mu m; the average groove depth of the protofilaments s 0.2-0.5mu m, the average groove width of the protofilaments is 0.1-0.4mu m, and the average surface roughness Ra of the protofilaments is 0.0182-0.0201mu m. The invention mainly aims to prepare the polyacrylonitrile-based graphite fiber which has an excellent mechanical property index such as strength and modi.

Description

technical field [0001] The invention relates to the field of fiber technology, in particular to a polyacrylonitrile-based graphite fiber and a preparation method thereof. Background technique [0002] High-strength and high-modulus polyacrylonitrile-based carbon fibers have the advantages of high tensile strength and high tensile modulus. Therefore, high-strength and high-modulus polyacrylonitrile-based carbon fibers can be used to manufacture rigid, thin, and dimensionally stable composite components; and These composite components are necessary special components for large aircraft, rockets, and space stations. [0003] In the prior art, the high-strength and high-modulus polyacrylonitrile-based carbon fibers are prepared by carbonizing the precursors and further subjecting them to high-temperature graphitization. Here, the graphitized polyacrylonitrile-based carbon fiber is also referred to as polyacrylonitrile-based graphite fiber. [0004] However, although the graphi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22
CPCD01F9/22
Inventor 吕春祥尹大宇孙同庆李永红
Owner 山西钢科碳材料有限公司
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