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Lignin-base nano carbon fibre and preparation method thereof

A nano-carbon fiber and lignin-based technology, applied in the field of nano-carbon fiber and its preparation, can solve the problems of difficult mass production of nano-carbon fiber

Inactive Publication Date: 2007-11-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is to overcome the disadvantages of low-cost mass production of nano-carbon fibers in the prior art, and provide a lignin-based carbon nano-fiber with a wide range of raw material sources and a simple and fast production process.

Method used

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  • Lignin-base nano carbon fibre and preparation method thereof
  • Lignin-base nano carbon fibre and preparation method thereof

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Embodiment 1

[0018] Alkali lignin powder and polybutylene terephthalate were pre-crystallized in a drying oven for 8h at a temperature of 80°C, and the alkali lignin powder and polybutylene terephthalate were mixed in a ratio of 25 / 75 (mass ratio), put it into a vacuum drying oven and dry for 48h at a temperature of 120°C. Blending and banburying in a twin-screw blender, slicing, and obtaining blended slicing. Blended fibers are obtained by melt spinning. It was placed in a protective atmosphere furnace and pre-oxidized in air at a heating rate of 3°C / min to 250°C for 1 hour. Carbonization was carried out under the protection of nitrogen gas flow. The heating rate is 3°C / min, the temperature is raised to 1000°C, and the carbonization process is 3 hours. Cool to room temperature to obtain carbon nanofibers. SEM analysis showed ( FIGS. 1 and 2 ) that the obtained carbon nanofibers had a diameter of 50-200 nm and a length of 5-10 μm.

Embodiment 2

[0020] Alkali lignin powder and polypropylene were pre-crystallized in a drying oven for 8 hours at a temperature of 100°C. The alkali lignin powder and polypropylene were taken in a ratio of 25 / 75 (mass ratio), and dried in a vacuum drying oven for 48 hours at a temperature of 150°C. Blending and banburying in a twin-screw blender, slicing, and obtaining blended slicing. Blended fibers are obtained by melt spinning. It was placed in a protective atmosphere furnace and pre-oxidized in air at a heating rate of 3°C / min to 200°C for 3 hours. Carbonization was carried out under the protection of nitrogen gas flow. The heating rate is 3°C / min, the temperature is raised to 1000°C, and the carbonization process is 5 hours. Cool to room temperature to obtain carbon nanofibers. The obtained carbon nanofibers have a diameter of 50-200 nm and a length of 5-10 μm.

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Abstract

The invention provides a nanophase carbon fiber based on the lignin which has wide material source and simple producing process. It is made by the lignin and the compound macromolecule with the 50-300nm diameter and 1-20 mu m length. The preparation method includes the process: (1) mixing the lignin and the compound macromolecule according to some ratio, then to cut sheet which is dried in vacuum; (2) the lignin / compound macromolecule mixing fiber is get by fusing filature method; (3) the mixing fiber is set in the drying box with protecting gas and preoxidation in air; it is carbonized in inert gas; then cool to room temperature and get the product.

Description

technical field [0001] The invention relates to nano-carbon fibers and a preparation method thereof, in particular to lignin-based nano-carbon fibers using lignin from a wide range of sources as a carbon source and a preparation method thereof. Background technique [0002] Carbon nanofibers (CNFs) refer to carbon fibers with a nanometer scale, which can be divided into carbon nanotubes, namely hollow carbon nanofibers and solid nanocarbon fibers, according to their structural characteristics. Solid carbon nanofibers refer to carbon nanofibers with a solid structure and a fiber diameter of less than 1000 nm. At present, the mature technologies for preparing solid nano-carbon fibers are mainly chemical vapor deposition (CVD) and electrospinning. [0003] The CVD method is to grow CNFs in the gas phase on the catalyst surface, and high-purity CNFs can be prepared, but the preparation of nano-scale catalyst particles is difficult, and the particle diameter is generally large (...

Claims

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Application Information

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IPC IPC(8): D01F9/17D01F9/26
Inventor 沈青张涛许园
Owner DONGHUA UNIV
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