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Preparation method of cellulose nanofiber

A nanofiber and cellulose technology, applied in the field of agricultural engineering, can solve the problems of inability to obtain cellulose nanofibers, and achieve the effect of improving mechanical properties, thermal properties, and excellent dispersibility.

Active Publication Date: 2013-04-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the cellulose macromolecules in the solution are entangled with each other, in the above methods, the regeneration process of cellulose from the solution is very fast, and cellulose nanofibers cannot be obtained.

Method used

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  • Preparation method of cellulose nanofiber
  • Preparation method of cellulose nanofiber
  • Preparation method of cellulose nanofiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Cool the solvent system composed of 5-10wt% NaOH, 0.1-20wt% urea and the rest of water to 0-15°C, add cellulose and stir to dissolve to obtain 50g of 0.5wt% cellulose solution. Slowly add distilled water dropwise to the cellulose solution under stirring until the cellulose is completely regenerated from the solution to obtain a cellulose nanofiber suspension. The cellulose nanofiber suspension is placed in a dialysis bag and dialyzed to neutrality, and then treated with a cell disruptor for 10 minutes to obtain a cellulose nanofiber aqueous dispersion. After freeze-drying, white fluffy cellulose nanofibers were obtained.

Embodiment 2

[0034] Cool the solvent system composed of 5-10wt% NaOH, 0.1-20wt% urea and the rest of water to 0-15°C, add cellulose and stir to dissolve to obtain a 1wt% cellulose solution. Slowly add methanol dropwise to the cellulose solution under stirring until the cellulose is completely regenerated from the solution to obtain a cellulose nanofiber suspension. The cellulose nanofiber suspension is placed in a dialysis bag and dialyzed to neutrality, and then treated with a homogenizer for 10 minutes to obtain a cellulose nanofiber aqueous dispersion. After freeze-drying, white fluffy cellulose nanofibers were obtained.

Embodiment 3

[0036] Cool the solvent system composed of 5-10wt% NaOH, 0.1-20wt% urea and the rest of water to 0-15°C, add cellulose and stir to dissolve to obtain a 1wt% cellulose solution. Slowly add hydrochloric acid dropwise to the cellulose solution under stirring until the cellulose is completely regenerated from the solution to obtain a cellulose nanofiber suspension. The cellulose nanofiber suspension is placed in a dialysis bag and dialyzed to neutrality, and then treated with a homogenizer for 10 minutes to obtain a cellulose nanofiber aqueous dispersion. The white fluffy cellulose nanofibers were obtained by replacing the water with ethanol and drying at the critical point.

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Abstract

The invention discloses a preparation method of cellulose nanofiber. The method comprises the following steps of: dissolving cellulose to obtain a cellulose solution; slowly adding a nonsolvent into the cellulose solution under stirring, thus enabling the cellulose to gradually regenerate from the solution; removing substances except for the cellulose and water, and re-dispersing the solution to obtain cellulose nanofiber dispersion liquid; and removing dispersion media, thus obtaining the cellulose nanofiber. The cellulose nanofiber has a cellulose II type crystal structure, and the diameter of the nanofiber is less than 50 nanometers. The cellulose nanofiber prepared by the method is long and is high in strength.

Description

technical field [0001] The invention relates to a preparation method of cellulose nanofibers and cellulose nanofibers obtained by the method, which belong to the field of natural polymers and also belong to the field of agricultural engineering. technical background [0002] Cellulose is the most abundant renewable plant resource on earth. It is a natural polymer composed of β-(1→4)-D-glucose, which is the main component of plant cell walls. Cellulose has the characteristics of hydrophilicity, chemical reactivity, biocompatibility and biodegradability. In addition to inheriting the above properties of cellulose, nanocellulose also has a high specific surface area, crystallinity and modulus, and has long been regarded as a natural polymer fiber with excellent comprehensive properties. Compared with general inorganic nano-reinforcement materials, cellulose nanofibers have the characteristics of renewable, wide sources, low energy consumption, low cost, low density, etc., and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/02C08L1/02C08J3/03C08J3/09
Inventor 蔡杰黄俊超程丹张俐娜
Owner WUHAN UNIV
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