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A kind of carbon nanotube/polyimide composite carbonized fiber and its production method

A carbon nanotube and carbonized fiber technology, which is applied in the field of textile fibers, can solve the problems of low mechanical properties of fiber membranes, limited PAA imidization conversion rate, difficult to dissolve, etc., and achieves the effect of improving mechanical properties and thermal stability.

Active Publication Date: 2022-01-21
福建莱茵丝防护科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain a good PI-based graphite film, it is necessary to prepare a PI fiber film first. Due to the high molecular weight of the PI film and the insoluble characteristics of PI, it is difficult to prepare a PI fiber film. At present, the commonly used method is to use PAA solution is spun into PAA fiber membrane, and then PI fiber membrane is prepared by thermal imidization, but the conversion rate of PAA imidization is limited, and the mechanical properties of fiber membrane are lower than theoretical

Method used

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  • A kind of carbon nanotube/polyimide composite carbonized fiber and its production method
  • A kind of carbon nanotube/polyimide composite carbonized fiber and its production method
  • A kind of carbon nanotube/polyimide composite carbonized fiber and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0029] The carbon nanotube / polyimide fiber and the carbon nanotube / polyimide composite carbonized fiber of Examples 1-8 were prepared according to the following methods.

[0030] Preparation of spinning yarn: using dimethylformamide as a solvent, prepare a polyamic acid (PAA) solution with a solid content of 15%. Weigh an appropriate amount of multi-walled carbon nanotubes (MWNTs) powder and add it to the PAA solution. .%, 1.5wt.%, 1.75wt.% MWNTs / PAA solution. After mechanical stirring for 6h, the MWNTs / PAA electrospinning solution was prepared.

[0031] Electrospinning: use MWNTs / PAA electrospinning solution to spin with electrospinning equipment to obtain carbon nanotube / polyamic acid fiber membrane (MWNTs / PAA).

[0032] Thermal imidization: In a box-type resistance furnace, the PAA fiber membrane and the composite fiber membrane MWNTs / PAA were subjected to thermal imidization respectively. ℃ (1h); 200°C (1h); 250°C (30min); 300°C (1h), and cooled to room temperature to o...

Embodiment 9-10

[0060] Compared with Example 3 (0.5wt.% MWNTs / PAA solution), the solid contents of the polyamic acid solutions of Example 9 and Example 10 were 17% and 20%, respectively.

[0061] Through a lot of research, it is found that when the solid content of the spinning dope is too low, the spinning effect is poor and it is easy to become particles; when the solid content of the spinning dope is too high, the spinning dope is too viscous and easy to block the metal needle. And the PI nanofiber membrane spun out feels hard. When the solid content of the spinning glue is 15-20wt%, the fiber film is flat, soft to the touch, evenly distributed in fibers, and has high spinnability.

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Abstract

The inventor provides a production method of carbon nanotubes / polyimide fibers, comprising the steps of: adding multi-walled carbon nanotubes to (amic acid) solution, and utilizing electrospinning equipment to make carbon nanotubes / polyamide acid fiber, and then heat it in a gradient stage, so that the polyamic acid / polyamic acid is dehydrated and cyclized to obtain carbon nanotubes / polyimide nanofibers; then the carbon nanotubes / polyimide nanofibers stage is heated to 900°C for carbonization treatment , to obtain carbon nanotube / polyimide composite carbonized fiber, the above method can effectively improve the mechanical properties and thermal stability of polyimide and carbonized polyimide materials.

Description

technical field [0001] The invention relates to a textile fiber, in particular to a carbon nanotube / polyamic acid composite carbonized fiber. Background technique [0002] Polyimide (PI) is a kind of engineering plastic with excellent performance. It has good mechanical and thermal properties, good radiation resistance and good dielectric properties. Therefore, PI is a kind of excellent comprehensive performance. organic polymer materials. PI is widely used in nanotechnology, aerospace technology, separation membrane technology, liquid crystal technology, laser technology, electronic substrates and other fields. In traditional industries, PI is used to make films, coatings, foam plastics, engineering plastics, etc. If it is made into fiber, its elastic modulus is almost the same as that of carbon fiber. It has good application in filter materials for radioactive substances and high-temperature media, and can also be used as bulletproof materials and fireproof fabrics. If ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94D01F1/10D01F9/24D01D5/00D01D10/02
CPCD01F6/94D01F1/10D01F9/24D01D5/0015D01D10/02
Inventor 严涛海时雅菁林瑜林雨玺王玉洁朱泽钦刘晓煜雷伏金
Owner 福建莱茵丝防护科技有限公司
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