A kind of high-strength high-modulus carbon fiber and its preparation method
A carbon fiber, high modulus technology, applied in the chemical characteristics of fibers, chemical post-processing of rayon, textiles and papermaking, etc., can solve the problems of different bulk density, gradient control differences, and difficulty in ensuring the heat resistance of linear molecular chains of fibers, etc. Achieve the effect of strong controllability and easy operation
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Embodiment 1
[0037] The preparation method of the high-strength and high-modulus carbon fiber of the present embodiment comprises the following steps:
[0038] (1) The 12K polyacrylonitrile fiber made by the laboratory is used for pre-oxidation treatment in the pre-oxidation furnace with 6 temperature zones. ℃, the fiber draft ratio in the first temperature zone is 2.0%, and the fiber draft ratio in the other temperature zones is -1.5%, the fiber residence time in each temperature zone is 16min, and the fiber body density after pre-oxidation is 1.380g / cm 3 .
[0039] (2) Use a low-temperature carbonization furnace to carry out low-temperature carbonization treatment on the pre-oxidized fibers in six temperature zones. The draft ratio is 4.0%, and the fiber residence time in each temperature zone is 40s;
[0040] Use a high-temperature carbonization furnace to carry out high-temperature carbonization treatment on pre-oxidized fibers in five temperature zones. The temperatures of high-temp...
Embodiment 2
[0044] The preparation method of the high-strength and high-modulus carbon fiber of the present embodiment comprises the following steps:
[0045] (1) The 12K polyacrylonitrile fiber made by the laboratory is used for pre-oxidation treatment in the pre-oxidation furnace with 6 temperature zones. ℃, the fiber draft ratio in the first temperature zone is 2.0%, and the fiber draft ratio in the other temperature zones is -1.5%, the fiber residence time in each temperature zone is 16min, and the fiber body density after pre-oxidation is 1.375g / cm 3 .
[0046] The operation process and parameters of steps (2)-(3) are the same as those in Example 1.
[0047] According to the national standard GB-T3362-2005, the fiber performance is tested, and the tensile curve is as follows image 3 As shown, the carbon fiber tensile strength is 4.52GPa, and the tensile modulus is 522GPa.
Embodiment 3
[0049] The preparation method of the high-strength and high-modulus carbon fiber of the present embodiment comprises the following steps:
[0050] (1) The 12K polyacrylonitrile fiber made by the laboratory is used for pre-oxidation treatment in the pre-oxidation furnace with 6 temperature zones. ℃, the fiber draft ratio in the first temperature zone is 2.0%, and the fiber draft ratio in the other temperature zones is -1.5%, the fiber residence time in each temperature zone is 16min, and the fiber body density after pre-oxidation is 1.370g / cm 3 .
[0051] The operation process and parameters of steps (2)-(3) are the same as those in Example 1.
[0052] According to the national standard GB-T3362-2005, the fiber performance is tested, and the tensile curve is as follows Figure 4 As shown, the carbon fiber tensile strength is 4.55GPa, and the tensile modulus is 534GPa.
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