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Method for preparing nano cellulose fibril

A nanocellulose and fibril technology, applied in fiber raw material processing, textile and papermaking, etc., can solve the problems of high energy consumption, low product yield, and high energy consumption of nanocellulose, achieve efficient removal, and inhibit excessive hydrolysis. , the effect of preserving the shape

Inactive Publication Date: 2018-03-20
ZHEJIANG TEXTILE & FASHION COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the preparation of nanocellulose by mechanical method has high energy consumption, which is not suitable for large-scale production, high energy consumption and low product yield.

Method used

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  • Method for preparing nano cellulose fibril
  • Method for preparing nano cellulose fibril
  • Method for preparing nano cellulose fibril

Examples

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preparation example Construction

[0028] The invention provides a method for preparing nano cellulose filaments. The preparation method includes the following steps:

[0029] S1, provide the biomass material, and process the biomass material with NaOH solution to obtain the processed biomass material;

[0030] S2, mix choline chloride and sulfosalicylic acid in a molar ratio of 1:1 to 4:1, and heat to 50°C to 80°C to obtain an acidic eutectic salt solution; S3, combine the obtained in step 1) The treated biomass material is added to the acidic eutectic salt solution obtained in step 2), and the temperature is increased to 80°C to 120°C, and the mixture is kept and stirred for 4 hours to 6 hours to obtain a mixture;

[0031] S4, filtering the mixture obtained in step 3) to obtain nanocellulose fibrils.

[0032] In step S1, the biomass material includes wood, bamboo, bark, etc. Before the biomass material is treated with the NaOH solution, the biomass material is crushed into particles. Specifically, the biomass mate...

Embodiment 1

[0041] Extracting nano-cellulose from cork chips includes the following steps:

[0042] 1) Put it into a grinder and grind into particles, put it in NaOH solution and boil, the mass fraction of NaOH in NaOH solution is 3%, the ratio of biomass material to NaOH solution is 10g: 100mL, and wash with hydrochloric acid or phosphoric acid. Adjust the pH of the biomass material to neutral and dry it in vacuum for use;

[0043] 2) Mix choline chloride and sulfosalicylic acid at a molar ratio of 1:1, stir magnetically, and heat to 65°C to obtain an acidic eutectic salt solution;

[0044] 3) Add the treated biomass material obtained in step 1) to the acidic eutectic salt solution obtained in step 2), and raise the temperature to 80° C., heat and stir for 6 hours to obtain a mixture, and process in step 3) The ratio of the latter biomass material to the acidic eutectic salt solution is 15g: 100mL;

[0045] 4) Filter the mixture obtained in step 3) to obtain nanocellulose fibrils.

[0046] In st...

Embodiment 2

[0051] Extracting nano-cellulose from bamboo chips includes the following steps:

[0052] 1) Put it into a grinder to grind into particles, put it in NaOH solution and boil it, the mass fraction of NaOH in NaOH solution is 10%, the ratio of biomass material to NaOH solution is 1g: 100mL, and wash with hydrochloric acid or phosphoric acid. Adjust the pH of the biomass material to neutral and dry it in vacuum for use;

[0053] 2) Mix choline chloride and sulfosalicylic acid in a 4:1 molar ratio, stir magnetically, and heat to 65°C to obtain an acidic eutectic salt solution;

[0054] 3) Add the treated biomass material obtained in step 1) to the acidic eutectic salt solution obtained in step 2), and raise the temperature to 100° C., heat and stir for 5 hours to obtain a mixture, and process in step 3) The ratio of the latter biomass material to the acidic eutectic salt solution is 5g: 100mL;

[0055] 4) Filter the mixture obtained in step 3) to obtain nanocellulose fibrils.

[0056] In s...

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Abstract

The invention relates to the field of preparation of natural high polymer materials and in particular to a method for preparing nano cellulose fibril. The method comprises the following steps: 1) providing a biomass material, namely treating a biomass material with a NaOH solution so as to obtain a treated biomass material; 2) mixing choline chloride and sulfosalicylic acid in a mole ratio of (1:1)-(4:1), and heating to 50-80 DEG C so as to obtain an acid co-fused salt solution; 3) putting the biomass material treated in the step 1) into the acid co-fused salt solution, heating to 80-120 DEG C, keeping the temperature, and stirring for 4-6 hours so as to obtain a mixture; and 4) filtering the mixture obtained in the step 3), thereby obtaining the nano cellulose fibril. By adopting the method, the purposes of efficiently removing lignin and hemicelluloses and retaining the morphology of cellulose fibril are achieved, and the method is an effective way for preparing cellulose fibril.

Description

Technical field [0001] The invention relates to the field of preparation of natural polymer materials, in particular to a method for preparing nano cellulose filaments. Background technique [0002] Nano-cellulose filaments not only have the characteristics of wide sources, non-toxic, and degradable, but also have nano-scale, high specific surface area, and high aspect ratio (diameter 20-50nm, length> 2μm), low density, superior strength performance and low thermal expansion coefficient and other special nanostructures and properties. Nano cellulose filaments are widely used in biomedicine, paper packaging, optoelectronic materials and various composite materials. [0003] Biomass materials such as tree trunks, bark, bamboo and flax and other plants contain natural nano-cellulose filaments. Nano-sized cellulose filaments are usually tightly combined with hemicellulose and lignin in plant cell walls. The lignin and hemicellulose contained in biomass are the parts that need to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00C08H7/00
CPCC08H6/00D21C5/00
Inventor 陈海珍那海宁朱锦
Owner ZHEJIANG TEXTILE & FASHION COLLEGE
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