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Method for preparing nanocellulose by using homogeneous method

A nano-cellulose, homogeneous method technology, applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of high production costs, difficult recovery of acid-base reagents, high energy consumption, etc., to achieve easy recycling and large-scale industrialization The effect of production

Active Publication Date: 2012-06-20
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the dense supramolecular structure of cellulose itself and the interaction between intermolecular hydrogen bonds and van der Waals forces, the attack efficiency of various biochemical reagents is hindered, making it difficult for cellulose to be hydrolyzed and refined. Micron-scale, uneven structure, and a large amount of acid-base reagents are not easy to recycle, resulting in high production costs, high energy consumption, environmental pollution, etc., becoming a bottleneck in the field of nanocellulose preparation

Method used

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  • Method for preparing nanocellulose by using homogeneous method
  • Method for preparing nanocellulose by using homogeneous method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Sodium hydroxide solution (volume concentration of 3%) was added to bagasse and treated at 80°C for 60 min, wherein the mass ratio of bagasse to sodium hydroxide solution was 1:15.

[0026] The treated bagasse is pulverized and passed through a 60-100 mesh sieve. Then add 1-butyl-3-methylimidazolium chloride ionic liquid to it, and place it in a microwave device with a power of 500w, under the condition of 140 oC, mechanically stir for 60min to obtain a cellulose homogeneous solution, the sugarcane The mass ratio of slag to 1-butyl-3-methylimidazolium chloride ionic liquid is 1:99. The obtained homogeneous solution was homogenized 10 times at 100 MPa in a shearing homogenizer. The obtained solution was poured into ethanol while stirring to precipitate cellulose, the volume ratio of the solution to ethanol was 1:4, centrifuged for precipitation, washed with ethanol for several times, and spray-dried to obtain nanocellulose. The length of the nanocellulose obtained in t...

Embodiment 2

[0029] Sodium hydroxide solution (volume concentration of 5%) was added to bagasse, and treated at 90°C for 60 min, wherein the mass ratio of bagasse to potassium hydroxide solution was 1:10.

[0030] The treated bagasse is pulverized and passed through a 60-100 mesh sieve. Then add 1-butyl-3-methylimidazolium chloride ionic liquid to it, and place it in a microwave device with a power of 400w, under the condition of 120oC, mechanically stir for 110min to obtain a homogeneous solution of cellulose, the bagasse The mass ratio with 1-butyl-3-methylimidazolium chloride ionic liquid is 1:20. The obtained homogeneous solution was added to a shearing homogenizer and homogenized 20 times at 80 MPa. The obtained solution was poured into water while stirring to precipitate cellulose, and the volume ratio of the solution to water was 1:8, centrifuged for precipitation, washed with water for several times, and vacuum freeze-dried to obtain nanocellulose. The length of the nanocellulose...

Embodiment 3

[0033] Potassium hydroxide solution (volume concentration of 2%) was added to the cotton pulp, and treated at 85oC for 90 minutes, wherein the mass ratio of cotton pulp to potassium hydroxide solution was 1:15.

[0034] The treated cotton pulp is pulverized and passed through a 60-100 mesh sieve. Then add 1-butyl-3-methylimidazolium chloride ionic liquid to it, and place it in a microwave device with a power of 400w, under the condition of 130 oC, mechanically stir for 100min to obtain a homogeneous solution of cellulose, the cotton The mass ratio of pulp to 1-butyl-3-methylimidazolium chloride ionic liquid was 1:15. The obtained homogeneous solution was added to a shearing homogenizer and homogenized 15 times at 120 MPa. The obtained solution was poured into ethanol while stirring to precipitate cellulose, and the volume ratio of the solution to ethanol was 1:6, centrifuged for precipitation, washed with ethanol for several times, and vacuum freeze-dried to obtain nanocellul...

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Abstract

The invention discloses a method for preparing nanocellulose by using a homogeneous method, relating to a method for preparing modified cellulose, i.e., the nanocellulose. The method comprises the following steps of: adding ionic liquid into crushed wood fibers to ensure that the mass percentage of the cellulose is 1-15%; carrying out microwave heating, and meanwhile, continuously stirring for 1-5h; then, carrying out high-pressure homogenization treatment; regenerating the obtained solution and drying to obtain the nanocellulose. The wood fibres being used as the raw materials in the method and belonging to a regenerative resource of waste crops are prepared into the nanocellulose, and the nanocellulose can be widely applied to the aspects such as medicines, fine chemistry and preparation of novel materials, and a new method can be provided for the efficient utilization of the regenerative resource.

Description

Technical field [0001] The present invention relates to a preparation method of modified cellulose, namely nanocellulose. Background technique [0002] Nanocellulose refers to cellulose crystals with nanometer dimensions. Its particle size is generally 30-100nm. It has a huge specific surface area and surface atomic number. It can be used as a drug carrier, coating thickener, nano-enhancer, dispersant, etc. Food additives, cosmetic matrix, membrane filters, etc., are widely used in medicine, fine chemicals, and preparation of new materials. [0003] At present, the conventional method for preparing nanocellulose is to use microcrystalline cellulose or natural cellulose as raw materials, and use chemical acid-base hydrolysis, physical and mechanical methods, biological and bacterial synthesis, chemical artificial synthesis or electrospinning to prepare one-dimensional cellulose. Nanocellulose with a scale of 1-100 nm. However, due to the dense supramolecular structure of c...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 李积华魏晓奕陈家翠唐永富黄茂芳付调坤
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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