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A kind of preparation method of cellulose nanofiber

A technology of nanofibers and cellulose, applied in the direction of artificial filaments in cellulose solution, single-component cellulose artificial filaments, nanotechnology, etc., can solve problems such as unseen reports

Inactive Publication Date: 2018-03-09
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many other functional polymer materials have been prepared by nano-template method (Wu H, Su Z, Takahara A. Isotactic polystyrene nanorods with gradient crystallite states[J]. Soft Matter, 2012, 8(11): 3180-3184) , but the preparation of cellulose nanofiber materials by nano-template method has not been reported so far

Method used

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  • A kind of preparation method of cellulose nanofiber
  • A kind of preparation method of cellulose nanofiber
  • A kind of preparation method of cellulose nanofiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0030] (1) Take 1g of crushed commercial bamboo pulp (bamboo pulp is selected from Sichuan Tianzhu Bamboo Resources Development Co., Ltd., and its cellulose content is ≥ 95wt.%), soak it in 1000mL water for one day, and add the filtered product to Soak in 500mL DMAc solvent, filter, repeat three times. Then add it to 15mL LiCl / DMAc solution with a concentration of 8 wt.% (the mass ratio of LiCl solid to DMAc liquid is 2:23), heat to 60°C and stir vigorously to dissolve the cellulose, and obtain the cellulose LiCl / DMAc DMAc solution.

[0031] (2) Add the cellulose LiCl / DMAc solution prepared in step (1) dropwise to the upper surface of the anodized aluminum template with a nanopore diameter of 300 nm, and then apply a vacuum on the lower surface, and the cellulose solution enters the template under negative pressure conditions inside the nanopore.

[0032] (3) repeatedly immersing and washing the template containing the cellulose LiCl / DMAc solution in step (2) with water, rem...

Embodiment 2

[0035](1) Take 1g of crushed commercial bamboo pulp (bamboo pulp is selected from Sichuan Tianzhu Bamboo Resources Development Co., Ltd., and its cellulose content is ≥ 95wt.%), and add it to 15mL of NMMO aqueous solution with a concentration of 70wt.%. Stir vigorously and heat to 110°C to dissolve the cellulose to obtain a cellulose NMMO solution.

[0036] (2) Add the NMMO cellulose solution prepared in step (1) dropwise to the upper surface of the anodized aluminum template with a nanopore diameter of 300 nm, and then apply a vacuum on the lower surface, and the NMMO cellulose solution enters the template under negative pressure conditions in the nanopore.

[0037] (3) Repeatedly soaking and washing the template containing the NMMO cellulose solution in step (2) with ethanol, removing the NMMO, and drying to obtain cellulose nanofibers in the nanopores;

[0038] (4) Place the sample obtained in step (3) in a 5wt.% phosphoric acid solution, dissolve the alumina template, was...

Embodiment 3

[0040] (1) Take 1g of crushed commercial bamboo pulp (bamboo pulp is selected from Sichuan Tianzhu Bamboo Resources Development Co., Ltd., and its cellulose content is ≥95wt.%), and add it to 60mL dimethyl sulfoxide and 6.6g In the mixed solution of tetrabutylammonium fluoride trihydrate, stir at room temperature for 20 minutes to dissolve the cellulose, and obtain the cellulose DMSO / TBAF·3H 2 O solution.

[0041] (2) The cellulose DMSO / TBAF·3H prepared in step (1) 2 The O solution is added dropwise to the upper surface of the anodized aluminum template with a nanopore diameter of 300 nm, and the cellulose solution wets the template through capillary force and enters the nanopores in the template.

[0042] (3) Fill step (2) with cellulose DMSO / TBAF·3H 2 The template of O solution was soaked and washed repeatedly with water and ethanol to remove DMSO / TBAF·3H 2 O, dry, obtain the cellulose nanofiber in the nano hole;

[0043] (4) Place the sample obtained in step (3) in 5wt....

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Abstract

The invention discloses a preparation method of cellulose nano fibers. The preparation method comprises the following steps: (1) crushing cellulose raw materials, and dissolving the raw materials with a homogeneous phase dissolving reagent to prepare a cellulose solution; (2) injecting the cellulose solution prepared by the step (1) into nano pores in a porous template; (3) washing the porous template injected with the cellulose solution in the step (2) by using a solvent, and then removing a cellulose solvent in the nano pores of the porous template to obtain cellulose nano fibers fixed in the nano pores; and (4) dissolving the porous template in the step (3) with a solvent to obtain cellulose nano fibers with an array structure. The material has the characteristics of light weight, high specific surface area, high strength and elasticity, high biocompatibility and biodegradability and the like, and can be used for a plurality of fields including chemical engineering, spinning, biology, medicine and the like.

Description

technical field [0001] The invention relates to the field of nanofiber materials, in particular to a cellulose nanofiber array and a preparation method thereof. Background technique [0002] Cellulose nanofibers (CNF) generally refer to ultrafine cellulose fibers with a fiber diameter of less than 100 nm. Within the cell walls of plants, it consists of many cellulose chains crystallized by intermolecular and intramolecular hydrogen bonds. Its strength is about 2 to 3 GPa, which is 5 times that of steel, but its mass is only 1 / 5 of that of steel. It has excellent properties such as light weight, high specific surface area, high strength and elasticity, biocompatibility and degradability. The methods for preparing cellulose nanofibers mainly include chemical methods, mechanical methods, and biological treatment methods. Cellulose nanofibers with a diameter of 3-15 nm can be obtained by dismantling cellulose bundles in raw materials such as wood and cotton through chemical a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F2/00D01F2/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00D01F2/00D01F2/02
Inventor 吴慧李国炜巫龙辉张君宇林新兴黄六莲陈礼辉
Owner FUJIAN AGRI & FORESTRY UNIV