Unlock instant, AI-driven research and patent intelligence for your innovation.

Large-tow asphalt-based carbon fiber and preparation method thereof

A pitch-based carbon fiber and large-tow technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, can solve the problem that there is no reasonable and effective method for preparing large-tow pitch-based carbon fibers, and the inability to prepare large-tow pitch-based carbon fibers, Problems such as the inability to prepare large tow raw silk, etc., to achieve the effect of continuous production, improved production efficiency, and smooth operation of the whole line

Active Publication Date: 2018-07-03
SHAANXI TIANCE NEW MATERIAL TECH
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the industrialization level of this industry is immature at present, and it is still impossible to prepare large-tow pitch-based carbon fibers with stable product performance. silk craft
2. Because the characteristics of asphalt raw materials determine the high temperature sensitivity in the spinning process, in the process of preparing pitch fiber precursors, it is impossible to prepare 6K, 12K, 24K large tow precursors like PAN precursors
3. There is currently no method for synthesizing large tows
In summary, there is currently no reasonable and effective method for preparing large-tow pitch-based carbon fibers

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
  • Large-tow asphalt-based carbon fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of the large tow pitch-based carbon fiber disclosed in the present invention, the basic technological process is:

[0025] Raw silk spinning - winding and winding - constant tension yarn release - air twisting - hot roller drying - non-melting treatment - carbonization treatment - graphitization treatment - untwisting - sizing treatment - drying - winding and winding.

[0026] see figure 1 , in order to realize the equipment block diagram of the above-mentioned technological process, wherein, 1 is a multi-station constant tension spinning machine; 2 and 3 are limit rollers; 4 is a twisting device (including 2 air interlacers); 5 is a heat Roll dryer (three rolls); 6 is a non-melting treatment furnace (chlorination furnace); 7 is a carbonization furnace; 8 is a graphitization furnace; 9 is an untwisting device (including 2 air interlacers); device; 11 is a drying device.

[0027] Taking 1K pitch-based raw silk as an example, the specific process ...

Embodiment 1

[0040] A preparation method of a large tow pitch-based carbon fiber, comprising the following steps:

[0041] 1) Using mesophase pitch as raw material, 1K pitch-based precursor fibers are prepared by melt spinning, with an average fiber diameter of 30 μm and a length of 5000 m;

[0042] 2) Unwinding through a 12-station constant tension unwinding machine (the unwinding tension is 200cN), limiting the width of the fiber through the limit roller (the width is controlled at 20mm), and the running speed of the whole line is controlled at 0.3m / min; use The air interlacer is used for twisting treatment (the number of air interlacers is 2), the compressed air flow is controlled at 0.8L / min, and the number of twists is controlled at 3 pieces / m; the twisted synthetic raw yarn is dried by hot rollers Treatment, the number of drying rollers is 3, the drying temperature is 150°C, 180°C, and 210°C, and the time is controlled at 900s;

[0043] 3) Non-melting treatment through three-roller ro...

Embodiment 2

[0052] A preparation method of a large tow pitch-based carbon fiber, comprising the following steps:

[0053] 1) Using mesophase pitch as raw material, 1K pitch-based precursor fibers are prepared by melt spinning, with an average fiber diameter of 15 μm and a length of 5000 m;

[0054] 2) Unwinding through a 12-station constant tension unwinding machine (the unwinding tension is 100cN), the width of the fiber is limited by the limit roller (the width is controlled at 20mm), and the running speed of the whole line is controlled at 0.3m / min; use The air interlacer is twisted (the number of air interlacers is 2), and the compressed air flow is controlled at 0.7m 3 / h, the number of twists is controlled at 2 / m; the twisted synthetic raw yarn is subjected to hot roller drying treatment, the number of drying rollers is 3, the drying temperature is 150°C, 180°C, and 210°C, and the time is controlled at 540s;

[0055] 3) Non-melting treatment by three-roller roller, starting tempera...

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
Tensile strengthaaaaaaaaaa
Modulusaaaaaaaaaa
Bulk densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a large-tow asphalt-based carbon fiber and a preparation method thereof, belonging to the technical field of preparation of carbon fibers. According to the adopted technical scheme, the method comprises the steps of after an asphalt-based raw thread is reeled, carrying out constant-tension thread release and air twisting treatment, and sequentially carrying out hot roll drying treatment, non-fusion treatment, carbonizing treatment, graphitization treatment, untwisting, sizing drying and final reeling on the twisted synthesized raw thread, so as to obtain the large-tow asphalt-based carbon fiber. According to the method, the operation is simple, integral operation is smooth and controllability is trong. The large-tow raw thread is synthesized in a carbonizing production process, so that the continuous production of a product is realized, the stability of the product is guaranteed, and the industrialization is realized.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber preparation, and in particular relates to a large tow pitch-based carbon fiber and a preparation method thereof. Background technique [0002] Pitch-based carbon fiber is a kind of mesophase pitch prepared by synthesis or pitch refining with naphthalene, petroleum pitch and coal pitch as raw materials, and then by spinning, non-melting, carbonization and graphitization, and the carbon content is more than 92%. special fibers. It has excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity and thermal conductivity, and is an indispensable engineering material in the aerospace industry. [0003] However, at present, the industrialization level of this industry is immature, and it is still impossible to prepare large tow pitch-based carbon fibers with stable product performance. si...

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
IPC IPC(8): D01F9/145
CPCD01F9/145
Inventor 康延涛
Owner SHAANXI TIANCE NEW MATERIAL TECH