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Preparation method of cellulose nanofiber filament

A nanofibril and cellulose technology, which is applied in the post-processing of cellulose pulp, cellulose treatment with microorganisms/enzymes, and fiber raw material treatment, etc. problems, to achieve the effect of low cost of raw materials, promotion of high-value utilization, and improvement of crystallinity

Active Publication Date: 2019-02-01
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used methods for preparing cellulose nanofibrils mainly include acid hydrolysis and TEMPO oxidation. These methods consume a large amount of chemicals, and these chemicals are difficult to recycle and have adverse effects on the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing cellulose nanofibrils, the specific steps are as follows:

[0027] S1. Xylanase treatment

[0028] Take the unbleached bagasse pulp and place it in a polyethylene bag, add citric acid-sodium phosphate buffer and mix it well with the pulp, adjust the pH of the pulp to 6.0, and add 30IU / g Absolute dry pulp Add citric acid-sodium phosphate buffer to the slurry to adjust the mass concentration of the slurry to 8%, knead the slurry in the bag to fully mix the slurry with xylanase, and then place it at 50°C In the constant temperature water bath, rub the slurry in the bag every 15 minutes to make the slurry and xylanase fully react. After 2 hours of reaction, remove the polyethylene bag from the water bath, and use deionized water to clean the slurry to After the pH is neutral, pack the bag to balance the moisture.

[0029] S2. Cold alkali treatment

[0030] Weigh the xylanase-treated slurry into a polyethylene plastic bucket, and then add the concentration o...

Embodiment 2

[0034] A method for preparing cellulose nanofibrils, the specific steps are as follows:

[0035] S1. Xylanase treatment

[0036] Take the unbleached bagasse pulp and place it in a polyethylene bag, add citric acid-sodium phosphate buffer and mix it thoroughly with the pulp to adjust the pulp pH to 6.1, and add 65IU / g Absolute dry pulp Add citric acid-sodium phosphate buffer to the slurry to adjust the mass concentration of the slurry to 8%, knead the slurry in the bag to fully mix the slurry with xylanase, and then place it at 50°C In the constant temperature water bath, rub the slurry in the bag every 15 minutes to make the slurry and xylanase fully react. After reacting for 2 hours and 15 minutes, remove the polyethylene bag from the water bath and use deionized water to remove the slurry. After cleaning until the pH is neutral, pack the bag to balance the moisture.

[0037] S2. Cold alkali treatment

[0038] Weigh the xylanase-treated slurry into a polyethylene plastic bucket, an...

Embodiment 3

[0042] A method for preparing cellulose nanofibrils, the specific steps are as follows:

[0043] S1. Xylanase treatment

[0044] Take the unbleached bagasse pulp and place it in a polyethylene bag, add citric acid-sodium phosphate buffer and mix it thoroughly with the pulp, adjust the pulp pH to 6.2, and add 100IU / g Absolute dry pulp Add citric acid-sodium phosphate buffer to the slurry to adjust the mass concentration of the slurry to 8%, knead the slurry in the bag to fully mix the slurry with xylanase, and then place it at 50°C In the constant temperature water bath, rub the slurry in the bag every 15 minutes to make the slurry and xylanase fully react. After 2.5 hours of reaction, remove the polyethylene bag from the water bath, and use deionized water to clean the slurry to After the pH is neutral, pack the bag to balance the moisture.

[0045] S2. Cold alkali treatment

[0046] Weigh the xylanase-treated slurry into a polyethylene plastic bucket, and then add the concentration...

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PUM

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Abstract

The invention discloses a preparation method of a cellulose nanofiber filament. Unbleached bagasse pulp is used as a raw material, and the unbleached bagasse pulp is treated through combination of xylanase treatment and cold alkali treatment, and superfine grinding and high-pressure homogenization treatment are carried out in combination, so that the cellulose nanofiber filament is prepared. The diameter of the cellulose nanofiber filament prepared by the preparation method can be controlled to be 20-40 nm, and the maximum pyrolysis rate temperature reaches 355.7-360.2 DEG C. A new way is provided for promoting the high-value utilization of bagasse pulp.

Description

Technical field [0001] The invention belongs to the technical field of high-value utilization of lignocellulosic biomass, and specifically relates to a preparation method of cellulose nanofibrils. Background technique [0002] With the continuous development of human society, people's demand for energy and materials is increasing. The extensive use of traditional fossil energy has caused serious environmental problems, and the research on renewable resources has become particularly important. Cellulose is the most abundant natural polymer compound on the earth, with good biocompatibility, biodegradability and biosynthesis. With the rapid development of materials science, the research on cellulose-based materials has gradually become a hot topic. The application of nanotechnology has greatly expanded the application fields of cellulose-based materials. Cellulose nanofibrils (CNF) have high aspect ratio and net-like entangled structure, and their finished products have the chara...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21C9/00
CPCD21C5/005D21C9/004
Inventor 聂双喜张宸源张坤张月华张琦
Owner GUANGXI UNIV
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