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B-Si doped asphalt-based carbon fibers and preparation method thereof

A technology of doping pitch and carbon fiber, which is applied in the fields of fiber chemical characteristics, rayon manufacturing, textiles and paper making, etc. It can solve the problems of complex process and high cost, and achieve the effect of simple process, low cost and uniform thickness

Active Publication Date: 2018-08-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the existing technologies have their own advantages, they all have problems such as high cost, complicated process, and special equipment required.

Method used

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  • B-Si doped asphalt-based carbon fibers and preparation method thereof
  • B-Si doped asphalt-based carbon fibers and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] A B-Si doped pitch-based carbon fiber and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0033] Step 1. According to the mass ratio of boron-containing organic precursor: silicon-containing organic precursor: asphalt as 1: (1~2): (16.5~18), the boron-containing organic precursor, the silicon-containing organic precursor The body is mixed with the asphalt to obtain an asphalt mixture.

[0034] The B content of the boron-containing organic precursor is 0.5~2wt%, and the boron-containing organic precursor is polyborazane; the Si content of the silicon-containing organic precursor is 10~18wt%, and the silicon-containing organic precursor is poly Carbosilane.

[0035] Step 2: Dissolving the asphalt mixture in the organic solvent according to the asphalt mixture:organic solvent mass ratio of 1:(1~1.5), and stirring for 2~3 hours to obtain the asphalt organic solvent mixture.

[0036] Step 3, move the asphalt-organic so...

Embodiment 2

[0044] A B-Si doped pitch-based carbon fiber and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0045]Step 1. According to the mass ratio of boron-containing organic precursor: silicon-containing organic precursor: asphalt is 1: (1.5~3): (15.5~17), the boron-containing organic precursor, the silicon-containing organic precursor The body is mixed with the asphalt to obtain an asphalt mixture.

[0046] The B content of the boron-containing organic precursor is 1.5 ~ 3wt%, and the boron-containing organic precursor is polyborosilazane; the Si content of the silicon-containing organic precursor is 18 ~ 25wt%, and the silicon-containing organic precursor is Polydimethylsilane.

[0047] Step 2: According to the asphalt mixture:organic solvent mass ratio of 1:(1.5-2), the asphalt mixture is dissolved in the organic solvent, and stirred for 2-3 hours to obtain the asphalt-organic solvent mixture.

[0048] Step 3, move the aspha...

Embodiment 3

[0056] A B-Si doped pitch-based carbon fiber and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0057] Step 1. According to the mass ratio of boron-containing organic precursor: silicon-containing organic precursor: asphalt is 1: (2.5~4): (14.5~16), the boron-containing organic precursor, the silicon-containing organic precursor The body is mixed with the asphalt to obtain an asphalt mixture.

[0058] The B content of the boron-containing organic precursor is 2.5 ~ 4wt%, and the boron-containing organic precursor is polyborazane; the Si content of the silicon-containing organic precursor is 25 ~ 32wt%, and the silicon-containing organic precursor is polyborazane. borosilazane.

[0059] Step 2: Dissolving the asphalt mixture in the organic solvent according to the asphalt mixture: organic solvent mass ratio of 1: (2-2.5), and stirring for 2-3 hours to obtain the asphalt-organic solvent mixture.

[0060] Step 3, move the ...

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Abstract

The invention relates to B-Si doped asphalt-based carbon fibers and a preparation method thereof. The method is characterized by comprising the following steps: blending a boron-containing organic precursor, a silicon-containing organic precursor and asphalt according to a mass ratio of 1 to (1-5) to (14-18), then dissolving the mixed asphalt mixture into an organic solvent, stirring, putting intoa reaction kettle, heating up to 200-400 DEG C in an inert atmosphere while stirring, carrying out heat preservation, and naturally cooling; after that, putting the cooled product into a melting cylinder of a melt spinning device, carrying out heat preservation in an inert atmosphere and at the temperature of 280-380 DEG C, spinning under the conditions that the temperature is 260-360 DEG C and the pressure is 0.2-0.8MPa, putting into a preoxidation furnace, and carrying out heat preservation at the temperature of 180-280 DEG C; finally, heating up to 500-1600 DEG C in a carbonization furnacein an inert atmosphere, and carrying out heat preservation for 1-2h to obtain the B-Si doped asphalt-based carbon fibers. The preparation method provided by the invention has the characteristics of being simple in process, low in cost and suitable for industrial production, and not needing special equipment; the prepared B-Si doped asphalt-based carbon fibers have good high temperature resistanceand oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of pitch-based carbon fibers. In particular, it relates to a B-Si doped pitch-based carbon fiber and a preparation method thereof. Background technique [0002] General-purpose pitch-based carbon fiber plays an important role in industry due to its simple process, wide range of sources and low cost. It is often used as high-temperature heat insulation materials, brake systems, cement reinforcements, capacitors, water purification, etc., and has a very wide range of applications. Application prospects (He Fu. Carbon fiber and its application technology [M]. Chemical Industry Press, 2004.). However, carbon fiber begins to oxidize in an aerobic environment above 400°C, and continuous oxidation will lead to a significant decrease in mechanical properties, limiting its service life and application environment. Therefore, the research on the oxidation resistance of carbon fiber is an urgent problem to be solved....

Claims

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Application Information

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IPC IPC(8): D01F9/15D01F9/155D01F1/10
CPCD01F1/10D01F9/15D01F9/155
Inventor 董志军杜力李轩科袁观明丛野
Owner WUHAN UNIV OF SCI & TECH