Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

Active Publication Date: 2020-08-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the short pre-oxidation period, although the degree of orientation can be effectively controlled, it is difficult to ensure that the linear molecular chains of the fiber are completely converted into a heat-resistant trapezoidal structure. Therefore, the performance of the prepared carbon fiber is 3.6GPa. Tensile strength, tensile modulus 240GPa , only reaching the level of high-strength medium-mold carbon fiber
[0005] The Chinese invention patent document with the application number 201410159117.4 discloses a carbon fiber acupuncture preform with a gradient change in volume density. The composition of each layer of prefabricated body is different due to the different carbon cloth layering methods, resulting in different bulk densities, so there is a significant difference from the gradient control in the fiber preparation process of this patent

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of high-strength high-modulus carbon fiber and its preparation method
  • A kind of high-strength high-modulus carbon fiber and its preparation method
  • A kind of high-strength high-modulus carbon fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-strength and high-modulus carbon fiber. A preparation method of the high-strength and high-modulus carbon fiber comprises the following steps: (1) carrying out six-temperature area pre-oxidation treatment on precursor fibers by using a pre-oxidation furnace with the bulk density of the fibers as a structural performance index to obtain pre-oxidized fibers; (2) carrying out six-temperature area low-temperature carbonization treatment on the pre-oxidized fibers in a low-temperature carbonization furnace, and carrying out five-temperature area high-temperature carbonization treatment on the low-temperature carbonized fibers in a high-temperature carbonization furnace to prepare carbon fibers; and (3) carrying out ultrahigh-temperature graphitization treatment onthe carbon fibers by adopting a high-temperature graphitization furnace to prepare the high-strength and high-modulus carbon fibers. The high strength, high modulus and stable performances of the carbon fibers are achieved by matching design of the pre-oxidation temperature, the low-temperature carbonization temperature, the high-temperature carbonization temperature, the graphitization temperature, the drafting ratio and the residence time in the continuous preparation process of the fibers; and the tensile strength of the carbon fibers prepared through the method is higher than 4.2 GPa, andthe tensile modulus of the carbon fibers is higher than 500 GPa.

Description

technical field [0001] The invention relates to the technical field of carbon fiber preparation, in particular to a high-strength and high-modulus carbon fiber and a preparation method thereof. Background technique [0002] Carbon fiber has a series of advantages such as high tensile strength, high tensile modulus, small thermal expansion coefficient, corrosion resistance, and electrical conductivity, so it has been widely used in aerospace, engineering applications, civil leisure and other fields. The usual processing process of carbon fiber includes precursor fiber preparation, pre-oxidation, low-temperature carbonization and high-temperature carbonization. According to the difference in fiber performance, carbon fiber can be divided into two types: high-strength medium-mode carbon fiber and high-strength high-mode carbon fiber. On the basis of carbon fiber, it is further obtained through ultra-high temperature graphitization treatment at 2000 ° C to 3000 ° C. After graphi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22D01F11/16
CPCD01F9/22D01F11/16
Inventor 钱鑫陈礼群支建海张永刚王雪飞李德宏宋书林
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products