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Novel carbon fiber with spiral structure and preparation method thereof

A technology of helical carbon fiber and helical structure, which is applied in the fields of carbon fiber, fiber processing, textile and paper making, etc., can solve the problems of poor controllability, easy agglomeration, difficult to prepare in large quantities, etc., and achieve the effect of easy control, avoidance of agglomeration and low cost.

Inactive Publication Date: 2013-04-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current industrial application of helical carbon fibers still has technical defects such as difficulty in mass production, poor controllability during preparation, and easy agglomeration of helical carbon fibers when added to composite materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of Co 2+ An aqueous solution with a concentration of 0.05 mol / L and a urea concentration of 0.1 mol / L;

[0022] (2) Introduce the carbon fiber into the solution of step (1) and immerse for 1 hour, then place them together in a hydrothermal tank and heat them to 120°C for 3 hours, then cool the hydrothermal tank with cold water, take out the carbon fiber, and let it dry naturally in the shade;

[0023] (3) Place the dried carbon fibers in a CVD furnace and calcinate at 350°C for 1 hour under a nitrogen atmosphere, and then reduce them at 500°C for 0.5 hours under a hydrogen atmosphere;

[0024] (4) Continue to heat up to 750°C, feed acetylene and hydrogen as reaction gases, the total flow rate of reaction gases is 2.0 L / min, the flow ratio of acetylene and hydrogen is 1 / 4, and the gas pressure in the CVD furnace is kept at 60 KPa . After reacting for 60 min, the furnace and gas were shut down, and nitrogen was introduced to protect and cool.

Embodiment 2

[0026] (1) Preparation of Ni 2+ An aqueous solution with a concentration of 0.1 mol / L and a urea concentration of 0.24 mol / L;

[0027] (2) Introduce the carbon fiber into the solution of step (1) and immerse for 1 hour, then place them together in a hydrothermal tank for 3 hours at 130°C and react for 3 hours, then cool the hydrothermal tank with cold water, take out the carbon fiber, and let it dry naturally in the shade;

[0028] (3) Place the dried carbon fiber in a CVD furnace to calcinate at 400°C for 1 hour under a nitrogen atmosphere, and then reduce it at 450°C for 1 hour under a hydrogen atmosphere;

[0029] (4) Continue to raise the temperature to 650°C, feed acetylene and hydrogen as the reaction gas, the total flow rate of the reaction gas is 2.0 L / min, the flow ratio of acetylene and hydrogen is 1 / 3, and the gas pressure in the CVD furnace is kept at 110 KPa . After reacting for 60 min, the furnace and gas were shut down, and nitrogen was introduced to protect a...

Embodiment 3

[0031] (1) Preparation of Fe 3+ An aqueous solution with a concentration of 0.25 mol / L and a concentration of urea of ​​1.125 mol / L;

[0032] (2) Introduce the carbon fiber into the solution of step (1) and immerse for 1 hour, then put them together in a hydrothermal tank for 3 hours at 140°C and react for 3 hours, then cool the hydrothermal tank with cold water, take out the carbon fiber, and let it dry naturally in the shade;

[0033] (3) Place the dried carbon fiber in a CVD furnace and calcinate at 450°C for 1 hour under a nitrogen atmosphere, and then reduce it at 550°C for 2 hours under a hydrogen atmosphere;

[0034] (4) Continue to raise the temperature to 620°C, feed acetylene as the reaction gas, the total flow rate of the reaction gas is 5.0 L / min, and keep the gas pressure in the CVD furnace at 2 KPa. After reacting for 90 min, the furnace and gas were shut down, and nitrogen was introduced to protect and cool down.

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PUM

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Abstract

The invention discloses a novel carbon fiber with a spiral structure and a preparation method of the novel carbon fiber. The carbon fiber comprises a straight carbon fiber and a spiral carbon fiber, wherein the spiral carbon fiber is grown on the surface of the straight carbon fiber. The preparation method of the novel carbon fiber comprises the following steps of: (1) preparing an aqueous solution, wherein the total molar concentration of metal ions of the aqueous solution is 0.05-0.25 mol / L; (2) impregnating the carbon fiber in the aqueous solution prepared in the step (1); (3) calcinating the carbon fiber treated in the step (2) for 1-2 hours in a nitrogen or inert atmosphere at the temperature of 350-450 DEG C, and then introducing in hydrogen into the nitrogen or inert atmosphere to carry out reduction on the carbon fiber for 0.5-2 hours at the temperature of 450-550 DEG C; and (4) heating the carbon fiber treated in the step (3) to 620-750 DEG C, and feeding acetylene gas into the nitrogen or inert atmosphere to carry out reaction for 45-120 min at the pressure of 2-110 KPa, thereby obtaining a combination with a spiral carbon fiber grown on the surface of a straight carbon fiber. The carbon fiber with the spiral structure disclosed by the invention not only can improve the mechanical properties of a composite material, but also can endow the composite material with special functions. The method disclosed by the invention is advantageous to the large-scale preparation of spiral carbon fibers; and the method is simple in preparation process, easy to control, and low in cost.

Description

technical field [0001] The invention relates to a novel carbon fiber with a helical structure and a preparation method thereof. Background technique [0002] Helical carbon fiber refers to carbon fiber with a regular helical coil or twist structure. According to the size of the screw diameter, it can be divided into micro-helical carbon fibers with a screw diameter at the micron scale and helical carbon nanofibers with a screw diameter at the nanoscale. Helical carbon fiber not only has excellent properties similar to carbon nanofibers, but its unique helical structure also endows it with good elasticity, unique electromagnetic and biocatalytic properties. , high-performance and multi-functional composite materials have potential application prospects. However, the current industrial application of helical carbon fibers still has technical defects such as difficulty in large-scale preparation, poor controllability during preparation, and easy agglomeration of helical carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/83D06M13/432D06M11/01D06M13/03C08K9/02C08K7/06D06M101/40
Inventor 刘磊周科朝陈腾飞
Owner CENT SOUTH UNIV
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