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Nanocellulose and preparation method thereof

A nanocellulose and cellulose technology, applied in the field of cellulose, can solve the problems of difficult recovery, long reaction time, low reaction efficiency, etc., and achieve the effects of reducing energy consumption and production cost, good redispersibility, and broad application prospects.

Inactive Publication Date: 2017-10-10
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical methods mainly include high-pressure homogeneous method, micro-jet method, disc grinding and ultrasonic method, etc. The main disadvantage of physical method is high energy consumption, sometimes as high as 25kWh / kg
The chemical method uses inorganic strong acid and strong alkali to treat cellulose. Strong acid and strong alkali are corrosive to equipment and difficult to recycle. Waste liquid treatment is difficult and pollutes the environment.
Enzymes in biological methods are more expensive and the reaction conditions are harsh, and the reaction efficiency is low and the reaction time is long

Method used

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  • Nanocellulose and preparation method thereof
  • Nanocellulose and preparation method thereof
  • Nanocellulose and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 500ml of distilled water to a 1L beaker, add 2.5mmol TEMPO (2,2,6,6-tetramethylpiperidine nitrogen oxide), 40mmol NaBr, 10mmolNaIO 4 Add to beaker and stir vigorously with a magnetic stirrer for 5 minutes. While the magnetic stirrer was continuously stirring, 5 g of commercially available microcrystalline cellulose was added into the beaker. After stirring evenly, 40 mmol of NaClO was slowly added. The stirring reaction was continued for 9 hours. During the reaction period, the pH value was adjusted once every 1.0 hour with 2M NaOH, so that the pH value of the reaction solution was maintained at about 10.5. After reacting for 9 hours, 5 mL of absolute ethanol was added to terminate the reaction, and the reaction time was 10 minutes. The whole experiment operation was carried out in the dark. The reaction solution was centrifuged at low speed for 2 minutes to precipitate the supernatant with absolute ethanol, and then centrifuged. The precipitate was washed twic...

Embodiment 2

[0044] Add 500ml of distilled water to a 1L beaker, add 2.5mmol TEMPO (2,2,6,6-tetramethylpiperidine nitrogen oxide), 40mmol NaBr, 10mmolNaIO 4 Add to beaker and stir vigorously with a magnetic stirrer for 5 minutes. While the magnetic stirrer was continuously stirring, 5 g of commercially available microcrystalline cellulose was added into the beaker. After stirring evenly, 40 mmol of NaClO was slowly added. The stirring reaction was continued for 10 hours. During the reaction period, the pH value was adjusted once every 1.0 hour with 2M NaOH, so that the pH value of the reaction solution was maintained at about 10.5. After reacting for 9 hours, 5 mL of absolute ethanol was added to terminate the reaction, and the reaction time was 10 minutes. The whole experiment operation was carried out in the dark. The reaction solution was centrifuged at low speed for 2 minutes, the supernatant was precipitated with absolute ethanol, and then centrifuged. The precipitate was washed ...

Embodiment 3

[0046] Except that vacuum drying time is 8 hours, all the other operation methods are the same as embodiment 1, can make as Figure 6 The sheet-like nanocellulose shown.

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Abstract

The invention provides nanocellulose capable of being gel-like, particle-shaped, powder-like or sheet-like, and a preparation method of the nanocellulose. The preparation method comprises steps as follows: a cellulose raw material is added to a reaction solution and is continuously stirred and reacts for 4.5-18.0 h at a specific pH value, the reaction is stopped with absolute ethyl alcohol, gel-like nanocellulose can be prepared from a reaction product through centrifugation, precipitation with a precipitator, washing with a washing liquid and suction filtration by a filter membrane, and if the gel-like nanocellulose is subjected to vacuum freeze drying, particle-shaped, powder-like or sheet-like nanocellulose can be prepared, wherein the reaction solution is a mixed solution of free radicals of nitroxide, periodate, sodium bromide and sodium hypochlorite. The method is short in treatment time, adopts a simple process and is suitable for large-scale industrial production. The nanocellulose product contains high-concentration functional groups on the surface, has good redispersibility in dispersion liquids such as water, ethyl alcohol and the like, and has broad application prospect in the fields of nanocomposites, medical polymer materials, functional apparel, 3D printing, photoelectricity and the like.

Description

technical field [0001] The invention belongs to the technical field of cellulose, and in particular relates to a nano-cellulose and a preparation method thereof. Background technique [0002] Nanocellulose is a kind of cellulose material whose size in one of the three dimensions is less than 100nm. Nanocellulose has small size effect, surface interface effect and macroscopic quantum tunneling effect, and exhibits unique optical, electrical, magnetic and chemical properties. It has a broad application prospect in the field of new material research and new technology. [0003] Cellulose, the main component of plant cell walls, is one of the most abundant renewable organic resources on Earth. The use of cellulose can not only produce clean energy, but also produce high-performance materials and high value-added chemicals to replace products derived from fossil resources. Due to the chemical crosslinking or physical entanglement of adjacent cellulose microfibrils, efficient n...

Claims

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Application Information

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IPC IPC(8): C08B15/02C08B15/04
CPCC08B15/02C08B15/04
Inventor 孙孝政裴熙祥宋丽英
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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