A method for preparing high-yield cellulose nanofibrils using enzyme-assisted mechanical grinding with low energy consumption

A nano-microfibril and mechanical grinding technology, which is applied in fiber raw material treatment, pulp beating/refining method, papermaking, etc., can solve the problem of serious fiber hydrolysis, increase porosity and accessible surface area, improve reactivity, The effect of promoting enzymatic hydrolysis

Active Publication Date: 2021-07-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of combining biological enzymes with mechanical methods is to pretreat fibers with a single enzyme before mechanical grinding, but if the amount of enzymes used is low, it will have little effect on reducing energy consumption, and increasing the amount of enzymes will inevitably make fiber hydrolysis more efficient. serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for preparing high-yield cellulose nano-microfibrils with low energy consumption by enzyme-assisted mechanical grinding of the present invention, the specific steps are as follows:

[0022] 1) Preparation of fiber slurry

[0023] Take bleached coniferous wood pulp board as raw material, weigh 600g of pulp board, then tear the pulp board to a size of 1-6cm in length and 1-6cm in width, put it in a clean bucket, and adjust the concentration to 0.4wt% with deionized water , after soaking at normal temperature and pressure for 8 hours, use a standard pulp decomposer until the pulp does not flocculate, and finally wash it with deionized water for 3 times to obtain fiber pulp.

[0024] 2) Mechanical grinding

[0025] Dilute the fiber slurry with deionized water to a fiber suspension with a concentration of 2wt%, then let it stand at room temperature and pressure for 7 hours, then use a standard slurry decomposer for 30 minutes, and finally suspend the decomposed f...

Embodiment 2

[0030] The method for preparing high-yield cellulose nano-microfibrils by using enzyme-assisted mechanical grinding of the present invention, the specific steps are as follows:

[0031] 1) Preparation of fiber slurry

[0032] Take bleached coniferous wood pulp board as raw material, weigh 600g of pulp board, then tear the pulp board to a size of 1-6cm in length and 1-6cm in width, put it in a clean bucket, adjust the concentration to 0.4% with deionized water, After soaking at normal temperature and pressure for 8 hours, use a standard slurry decomposer to decompose the slurry until the slurry does not flocculate, and finally wash it with deionized water for 3 times to obtain fiber slurry.

[0033] 2) Enzyme pretreatment

[0034] First weigh 200 g of the fiber slurry sample (dry) and place it in a polyethylene bag, then measure 61.0 mL of Na with a concentration of 0.2 mol / L 2 HPO 4 12H 2 O solution and 39.0 mL of NaH with a concentration of 0.3 mol / L 2 PO 4 2H 2 After ...

Embodiment 3

[0041] The method for preparing high-yield cellulose nano-microfibrils with low energy consumption by enzyme-assisted mechanical grinding of the present invention, the specific steps are as follows:

[0042] 1) Preparation of fiber slurry

[0043] Take bamboo pulp board as raw material, weigh 500g of pulp board, then tear the pulp board to a size of 1-6cm in length and 1-6cm in width, put it in a clean bucket, adjust the concentration to 0.2% with deionized water, and keep it at room temperature After soaking for 8 hours under normal pressure, use a standard pulp decomposer until the pulp is not flocculated, and finally wash it with deionized water for 3 times to obtain fiber pulp.

[0044] 2) Enzyme pretreatment

[0045] First weigh 200 g of the fiber slurry sample (dry) and put it in a polyethylene bag, then measure 7.0 mL of NaAc solution with a concentration of 0.2 mol / L and 3.0 mL of HAc solution with a concentration of 0.3 mol / L and mix them evenly Add as a buffer solu...

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Abstract

The invention discloses a method for preparing high-yield cellulose nanofibrils with low energy consumption by using enzyme-assisted mechanical grinding, using mechanical grinding + enzyme post-treatment, enzyme pre-treatment + mechanical grinding + enzyme post-treatment or compound enzyme pre-treatment +Mechanical milling method with low energy consumption to prepare cellulose nanofibrils with high yield, smaller size and more uniform size. The present invention has the advantages of (1) greatly improving the yield of cellulose nano-microfibrils; (2) the prepared cellulose nano-microfibrils have smaller size and better size uniformity; ( 3) At the same time, the energy consumption of the mechanical grinding process is greatly reduced. In this way, industrialized, efficient, green and pollution-free production of nanocellulose with a more uniform size is realized.

Description

technical field [0001] The invention belongs to the technical field of nano-cellulose preparation, and in particular relates to a method for preparing high-yield cellulose nano-microfibrils by using enzyme-assisted mechanical grinding with low energy consumption. Background technique [0002] Due to its excellent properties such as biodegradability, large specific surface area, high aspect ratio, low density, high strength, good thermal stability, and wide range of sources, nanocellulose has been widely used, including barrier packaging materials, polymers, etc. Composite materials, conductive films, electronic substrates and other fields. The mechanical preparation of nanocellulose is considered to be the most potential method for large-scale production of nanocellulose because it does not require chemical reagents, is green and pollution-free, and has strong control over the size of fibers. [0003] However, when the fiber size is large, mechanical grinding is more effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21D1/30
Inventor 宋雪萍张彩红吴敏徐荧杨爽何辉聂双喜王双飞
Owner GUANGXI UNIV
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