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A kind of carbon fiber with high tensile strength and high tensile modulus and preparation method thereof

A high tensile modulus, high tensile strength technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problem of short pre-oxidation stage, only high tensile modulus of carbon fiber properties, and difficulty in fully forming heat resistance. The trapezoidal structure and other problems can achieve the effect of strong controllability and easy operation.

Active Publication Date: 2020-09-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can effectively control the degree of fiber orientation after pre-oxidation, it is difficult to completely form a heat-resistant trapezoidal structure because the pre-oxidation stage is too short, so the performance tensile modulus of the prepared carbon fiber is only higher than 240GPa

Method used

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  • A kind of carbon fiber with high tensile strength and high tensile modulus and preparation method thereof
  • A kind of carbon fiber with high tensile strength and high tensile modulus and preparation method thereof
  • A kind of carbon fiber with high tensile strength and high tensile modulus and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) The 6K polyacrylonitrile fibers made in the laboratory were pre-oxidized in 6 temperature zones using a pre-oxidation furnace to obtain pre-oxidized fibers. ℃, 245℃, the drafting ratio of 1 temperature zone is 1.5%, the drafting ratio of other temperature zones is -1.0%, the pre-oxidation time of each temperature zone is 15min, and the content of H element in the fiber after each temperature zone is 5.58% and 5.49% respectively , 5.22%, 4.94%, 4.48%, 4.15%;

[0040] (2) Low-temperature carbonized fibers are obtained from pre-oxidized fibers through low-temperature carbonization treatment in five temperature zones. The temperatures in each temperature zone are 300°C, 450°C, 550°C, 700°C, and 800°C. 5min;

[0041]The low-temperature carbonized fiber was subjected to high-temperature carbonization treatment in four temperature zones to obtain high-temperature carbonized fiber. The temperatures in each temperature zone were 1000°C, 1250°C, 1400°C, and 1500°C, the draft...

Embodiment 2

[0047] (1) The 6K polyacrylonitrile fiber made in the laboratory was pre-oxidized in 6 temperature zones using a pre-oxidation furnace to obtain pre-oxidized fibers. ℃, 247℃, the drafting ratio of 1 temperature zone is 1.5%, the drafting ratio of other temperature zones is -1.0%, the pre-oxidation time of each temperature zone is 15min, and the content of H element in the fiber after each temperature zone is 5.61% and 5.22% respectively , 5.10%, 4.72%, 4.52%, 4.30%.

[0048] The operation process and parameters of steps (2)-(3) are the same as those in Example 1.

[0049] According to the national standard GB-T3362-2005, the fiber performance is tested, and each group of tests measures 8 samples. The data of the 8 samples tested are shown in the following table 3, and the average value is taken to obtain the tensile strength of the carbon fiber with high tensile strength and high tensile modulus. The tensile strength was 4.74 GPa, and the tensile modulus was 549 GPa.

[0050...

Embodiment 3

[0053] (1) Pre-oxidize the 6K polyacrylonitrile fiber made in the laboratory by pre-oxidation treatment in 6 temperature zones to obtain pre-oxidized fiber. ℃, 245℃, the drafting ratio of 1 temperature zone is 1.5%, the drafting ratio of other temperature zones is -1.0%, the pre-oxidation time of each temperature zone is 15min, and the content of H element in the fiber after each temperature zone is 5.59% and 5.45% respectively , 5.21%, 4.93%, 4.68%, 4.28%.

[0054] The operation process and parameters of steps (2)-(3) are the same as those in Example 1.

[0055] According to the national standard GB-T3362-2005, the fiber performance is tested, and each group of tests measures 8 samples. The data of the 8 samples tested are shown in Table 4 below, and the average value is taken to obtain the tensile strength of high tensile modulus carbon fiber. The tensile strength was 4.72 GPa, and the tensile modulus was 546 GPa.

[0056] Table 4 Tensile properties of high tensile strengt...

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Abstract

The invention discloses a high-tensile strength high-tensile modulus carbon fiber. A preparation method comprises the following steps: (1) using the content of a H element in the fiber as a control index of a fiber structure, and pre-oxidizing the polyacrylonitrile fiber with a six-temperature zone by using a pre-oxidation furnace to obtain the pre-oxidized fiber with the H element content of 4.0to 4. 4%; (2) using a low-temperature carbonization furnace to carry out low-temperature carbonization treatment of the pre-oxidized fiber with a five-temperature zone, and then using the high-temperature carbonization furnace to carry out high-temperature carbonization treatment with a four-temperature zone; and (3) performing superhigh temperature graphitization treatment on high-temperature carbonized fiber by using a ultra-high temperature graphitization furnace to prepare the carbon fiber. In the continuous preparation process of fiber, the high tensile strength and high tensile modulus of carbon fiber are achieved by matching the temperature, drafting ratio and stay time of pre-oxidation, low-temperature carbonization, high-temperature carbonization and graphitization, and the carbonfiber prepared by the method of the present invention has a tensile strength higher than 4.5 GPa and a tensile modulus higher than 540 GPa.

Description

technical field [0001] The invention relates to the technical field of high-performance carbon fiber preparation, in particular to a carbon fiber with high tensile strength and high tensile modulus and a preparation method thereof. Background technique [0002] High tensile strength and high tensile modulus carbon fiber, also known as graphite fiber, is a carbon fiber with a carbon content of more than 99%. It has high tensile modulus, small thermal expansion coefficient, stable size, corrosion resistance, and electrical and thermal conductivity. Haowai has a series of excellent characteristics, especially the use of it to enhance the dimensional stability and rigidity of composite materials, so it has become a key raw material for aerospace products such as spacecraft. High-strength and high-modulus carbon fiber is obtained on the basis of high-strength medium-modulus carbon fiber through further ultra-high temperature graphitization treatment. Graphitization treatment can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22
CPCD01F9/22
Inventor 钱鑫王雪飞张永刚宋书林
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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