A kind of kelp cellulose nanofiber and preparation method thereof

A nanofiber and cellulose technology, applied in nanotechnology and other directions, can solve problems such as unfriendly, corrosive environment of reagents, etc., and achieve the effect of simple production process and increased charge density.

Active Publication Date: 2020-10-09
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is more economical and quicker, the reagents used are corrosive and environmentally unfriendly.

Method used

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  • A kind of kelp cellulose nanofiber and preparation method thereof
  • A kind of kelp cellulose nanofiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 0.5g of kelp cellulose CNC in 500mL of ultrapure water, stir magnetically at room temperature for 30min to fully swell;

[0027] (2) The swollen CNF in step (1) is placed in an ultrasonic cell disrupter for 10 minutes and the power is 150W to fully disperse the CNC;

[0028] (3) Add 0.008g TEMPO, 0.05gNaBr, 2.87gNaClO in step (2) under the condition of ice bath (0-5℃);

[0029] (4) Adjust the pH of the solution in step (3) with 0.1mol / L NaOH and 0.1mol / L HCl, so that the pH value is controlled at about 10;

[0030] (5) Until the pH value of the solution does not change in step (4), adjust the pH value of the solution to 7, and add 3ml of absolute ethanol to terminate the reaction;

[0031] (6) The CNF suspension obtained in step (5) was heated at 5000 g Centrifuge 3 times under certain conditions, and wash the supernatant 3 times in a Buchner funnel;

[0032] (7) The CNF suspension obtained in step (6) was placed in an ultrasonic cell disruptor for 5 min an...

Embodiment 2

[0035] (1) Weigh 0.5g of kelp cellulose CNC in 500mL of ultrapure water, stir magnetically at room temperature for 30min to fully swell;

[0036] (2) The swollen CNF in step (1) is placed in an ultrasonic cell disruptor for 10 minutes and the power is 150W to fully disperse the CNF;

[0037] (3) Add 0.008g TEMPO, 0.05gNaBr, 3.6gNaClO in step (2) under the condition of ice bath (0-5℃);

[0038] (4) Adjust the pH of the solution in step (3) with 0.1mol / L NaOH and 0.1mol / L HCl, so that the pH value is controlled at about 10;

[0039] (5) Until the pH value of the solution does not change in step (4), adjust the pH value of the solution to 7, and add 3ml of absolute ethanol to terminate the reaction;

[0040] (6) The CNF suspension obtained in step (5) was heated at 5000 g Centrifuge 3 times under certain conditions, and wash the supernatant 3 times in a Buchner funnel;

[0041] (7) The CNF suspension obtained in step (6) was placed in an ultrasonic cell disruptor and sonicated...

Embodiment 3

[0044] (1) Weigh 0.5g of kelp cellulose CNC in 500mL of ultrapure water, stir magnetically at room temperature for 30min to fully swell;

[0045] (2) The swollen CNF in step (1) is placed in an ultrasonic cell disruptor for 10 minutes and the power is 150W to fully disperse the CNF;

[0046](3) Add 0.008g TEMPO, 0.05gNaBr, 4.32gNaClO in step (2) under ice bath (0-5°C);

[0047] (4) Adjust the pH of the solution in step (3) with 0.1mol / L NaOH and 0.1mol / L HCl, so that the pH value is controlled at about 10;

[0048] (5) Until the pH value of the solution does not change in step (4), adjust the pH value of the solution to 7, and add 3ml of absolute ethanol to terminate the reaction;

[0049] (6) The CNF suspension obtained in step (5) was heated at 5000 g Centrifuge 3 times under certain conditions, and wash the supernatant 3 times in a Buchner funnel;

[0050] (7) The CNF suspension obtained in step (6) was placed in an ultrasonic cell disruptor and sonicated for 5 minutes w...

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Abstract

The invention provides kelp cellulose nanofiber (CNF) and a preparation method thereof. The kelp cellulose nanofiber (CNF) comprises the following main components: cellulose nanocrystal (CNC), TEMPO,NaBr, NaClO and ultrapure water which are dispersed by using an ultrasonic cell disruptor; the mass ratio of the CNC to the TEMPO to the NaBr to the NaClO to the ultrapure water is 0.5: 0.008:0.05:(2.87 to 4.32):500. The method disclosed by the invention is simple to operate, energy-saving and economical, and the prepared kelp cellulose nanofiber is relatively small in particle size and good in stability.

Description

technical field [0001] The invention belongs to the field of nanocellulose preparation, and in particular relates to a kelp cellulose nanofiber (CNF) and a preparation method thereof. Background technique [0002] Cellulose is a high molecular polymer composed of amorphous and crystalline regions, widely distributed in plants. It is also a linear homopolymer composed of multiple D-glucopyranose units linked by β-(1,4) glycosidic bonds. Inside the cellulose, hydrogen bonds are relatively strong, and the existence of this rigid hydrogen bond network preserves the integrity of the excellent mechanical properties of cellulose. But this rigid structure also makes the personalized release of nanofibers difficult, requiring complex processing to become nanocellulose. The preparation of CNF requires further release of the rigid structure of cellulose. To solve this obstacle, the mainstream CNF preparation method is acid hydrolysis. Although this method is more economical and qui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/02B82Y40/00
CPCB82Y40/00C08B15/02
Inventor 汪少芸朱文进伍久林陈立
Owner FUZHOU UNIV
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