Preparation method of nanometer carbon fiber material containing polyvinylpyrrolidone

A polyvinylpyrrolidone and carbon nanofiber technology, applied in the field of materials, can solve the problems of affecting the dielectric constant, poor reactivity, and decreased performance, and achieve the effects of reducing costs, improving performance, and improving spinnability

Inactive Publication Date: 2012-08-15
李翠花
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot produce carbon nanofibers only with lignin, which only accounts for 25%
Moreover, due to the use of ordinary alkaline lignin, which contains more inorganic salt ash, especially non-wood alkali lignin, the ash will be mixed into the fiber during the spinning process, which will eventually affect the purity of carbon nanofibers, and then affect its dielectric constant. leading to a decrease in its performance
[0005] Although the preparation technology of plant-based carbon nanofibers can significantly reduce the cost of carbon nanofibers, due to the poor reactivity of natural macromolecules such as lignin, lignin macromolecules cannot directly replace traditional resources to prepare carbon fibers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 10g of rice straw lignin obtained by solvent cooking method, dissolve it in 100mL of acetic acid solution to fully dissolve, then use a 100-mesh filter to remove mechanical impurities, add 800ml of distilled water to the filtrate to precipitate lignin, then filter, and use lignin Wash with distilled water to pH 6, put the lignin in a drying oven at 50°C and dry for 7 hours, take out the lignin and pulverize it with a plant pulverizer, and store the powder in a desiccator.

[0022] Add 5g of purified lignin powder, 2g of polyvinyl alcohol, and 5g of polyvinylpyrrolidone into a 500ml reagent bottle, then add 100g of hexafluoroisopropanol to the reagent bottle, seal the glass bottle, and shake repeatedly until the solute is completely dissolved , to obtain a spinning solution.

[0023] The spinning solution was placed in the liquid storage container of the high-voltage electrospinning device, and was output from the container to the feeding needle of the high-voltage...

Embodiment 2

[0026] Weigh 40g of spruce lignin obtained by kraft cooking, dissolve it in 800mL of dimethyl sulfoxide and acetone solution, and then remove mechanical impurities with a 200-mesh filter, add 2500ml of distilled water to the filtrate to make the lignin Precipitate, then filter, wash the lignin with distilled water to pH 8, put the lignin in a drying oven at -50°C for 10 hours, take out the lignin and grind it with a plant pulverizer, and store the powder in a desiccator.

[0027] Add 30g of purified lignin powder, 5g of polyacrylate, and 10g of polyvinylpyrrolidone to a 500ml reagent bottle, then add 100g of 1,4-dioxane mixed solution to the reagent bottle, seal the glass bottle, and shake repeatedly , until the solute is completely dissolved to obtain a spinning solution.

[0028] The spinning solution was placed in the liquid storage container of the high-voltage electrospinning device, and was output from the container to the feeding needle of the high-voltage electrospinni...

Embodiment 3

[0031] Weigh 80g of masson pine lignin obtained by sulfite cooking, dissolve it in 400mL of chloroform solution, and then remove mechanical impurities with an 80-mesh filter, add 800ml of distilled water to the filtrate to precipitate the lignin, then filter, and the wood Wash the lignin with distilled water to pH 8, put the lignin in a drying oven at -35°C and dry it for 10 hours, take out the lignin and pulverize it with a plant pulverizer, and store the powder in a desiccator.

[0032] Add 50g of purified lignin powder and 10g of polyvinylpyrrolidone to a 500ml reagent bottle, then add 100g of acetone and tetrahydrofuran solution to the reagent bottle, seal the glass bottle, and shake repeatedly until the solute is completely dissolved to obtain a spinning solution.

[0033]The spinning solution was placed in the liquid storage container of the high-voltage electrospinning device, and was output from the container to the feeding needle of the high-voltage electrospinning dev...

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Abstract

The invention relates to a preparation method of a nanometer carbon fiber material containing polyvinylpyrrolidone, which is characterized in that wood fiber resources are used as raw materials, and the method comprises the following steps: extracting lignin from wood fibers by a boiling process, removing impurities in the lignin by an organic solvent extraction method, mixing the purified lignin, the organic solvent, and polyvinylpyrrolidone and dissolving, continuously injecting the mixed solution into a high pressure electrostatic spinning device, performing spinning to obtain nanometer fibers, finally preoxidizing the obtained nanometer fibers in air, and performing high temperature carbonization in the presence of protective gas to obtain the nanometer fibers. The invention has cheap and easily available raw materials, a simple preparation process, easy operations, and good repeatability, and is suitable for large scale production.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a method for preparing a polyvinylpyrrolidone-containing nano-carbon fiber material. Background technique [0002] Carbon nanofibers (CNFs) are carbon materials with a diameter of 50-200 nm, a length of 50-100 μm, and an aspect ratio of 100-500. CNFs fill the gaps in the size of conventional carbon fibers (7-10 μm in diameter), single-walled carbon nanotubes (SWNTs) (about 1 nm in diameter) and multi-walled carbon nanotubes (MWNTs) (1-50 nm in diameter). It has the characteristics of high strength and modulus, aspect ratio, thermal stability, chemical activity, electrical conductivity, etc., and also has the advantages of very small number of defects, large specific surface area, good electrical conductivity, and compact structure. It is expected to be used in catalysts and catalysts Carriers, lithium-ion secondary battery anode materials, electric double layer capacitor electrodes, hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/17D01D5/00
Inventor 陈洪章于彬王岚冯玉
Owner 李翠花
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