Preparation method of mild and green lignin-containing nanocellulose fibrils and product

A technology of nanocellulose and lignin, which is applied to pulping of cellulose raw materials, single-component cellulose rayon, and rayon manufacturing, etc., can solve the problems of unfavorable LCNF preparation, low pulp whiteness, cumbersome process, etc. Achieve the effect of good application potential, reduced process and low energy consumption

Pending Publication Date: 2021-10-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In "NaOH pretreatment of bagasse and oxygen-alkali pulping", the temperature of oxygen-alkali pulping after alkali treatment is 130 ° C, and MgSO 4 The dosage is 2%, the process is cumbersome, the energy consumption is high, the pulp whiteness is low, and the viscosity is high, which is not conducive to the preparation of LCNF

Method used

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  • Preparation method of mild and green lignin-containing nanocellulose fibrils and product
  • Preparation method of mild and green lignin-containing nanocellulose fibrils and product
  • Preparation method of mild and green lignin-containing nanocellulose fibrils and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Accurately weigh 40.0g bagasse raw material to add water at a solid-to-liquid ratio of 1:10, and 23w% (mass ratio of bagasse raw material, the same below) NaOH, 0.5w% MgSO 4 well mixed;

[0037] (2) Put the above-mentioned raw materials mixed with chemicals in the rotary cooking system, then fill with 0.6MPa oxygen, set the heating time to 95°C for 30 minutes, and keep warm for 3 hours; after the chemical treatment, use a large amount of deionized Bagasse fiber can be obtained by washing with water several times;

[0038] (3) Disperse the bagasse fiber obtained in step (2) in a certain volume of aqueous solution to make its solid content 2%, then treat it with a wall breaker for 15 minutes and then use a 600W cell breaker for ultrasonication for 30 minutes;

[0039] (4) Store the obtained lignin-containing nanocellulose fibril solution in a refrigerator at 4° C. to prevent the cellulose solution from overheating and agglomerating.

[0040] The resulting AFM pictur...

Embodiment 2

[0042] (1) Accurately weigh 40.0g bagasse raw material to add water at a solid-to-liquid ratio of 1:10, and 18w% (mass ratio of bagasse raw material, the same below) NaOH, 0.5w% MgSO 4 well mixed;

[0043] (2) Put the above-mentioned raw materials mixed with chemicals in the rotary cooking system, then fill with 0.6MPa oxygen, set the heating time to 95°C for 30 minutes, and keep warm for 3 hours; after the chemical treatment, use a large amount of deionized Bagasse fiber can be obtained by washing with water several times;

[0044] (3) Disperse the bagasse fiber obtained in step (2) in a certain volume of aqueous solution to make its solid content 0.8%, then use a cell breaker to treat it for 15 minutes and then use a 600W cell breaker for ultrasonication for 30 minutes;

[0045] (4) Store the obtained lignin-containing nanocellulose fibril solution in a refrigerator at 4° C. to prevent the cellulose solution from overheating and agglomerating.

[0046] The resulting AFM pi...

Embodiment 3

[0048] (1) Accurately weigh 40.0g bagasse raw material to add water at a solid-to-liquid ratio of 1:10, and 18w% (mass ratio of bagasse raw material, the same below) NaOH, 0.5w% MgSO 4 well mixed;

[0049] (2) Put the above-mentioned raw materials mixed with chemicals in the rotary cooking system, then fill with 0.6MPa oxygen, set the heating time to 95°C for 30 minutes, and keep warm for 1 hour; after the chemical treatment, use a large amount of deionized Bagasse fiber can be obtained by washing with water several times;

[0050](3) Disperse the bagasse fiber obtained in step (2) in a certain volume of aqueous solution to make its solid content 0.8%, then use a cell breaker to treat it for 15 minutes and then use a 600W cell breaker for ultrasonication for 30 minutes;

[0051] (4) Store the obtained lignin-containing nanocellulose fibril solution in a refrigerator at 4° C. to prevent the cellulose solution from overheating and agglomerating.

[0052] The resulting AFM pict...

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Abstract

The invention discloses a preparation method of mild and green lignin-containing nanocellulose fibrils and a product. The method comprises the steps that straw raw materials are added with water and then placed in a cooking system, sodium hydroxide and magnesium sulfate are added, then oxygen is introduced, and raw material fibers are obtained through washing with deionized water after cooking treatment; and deionized water is added, and treaded by using a wall breaking machine, and then treated by using a cell crusher to obtain a lignin-containing nanocellulose fibril suspension. The bagasse, rice and wheat straw and other straws are used as raw materials, and the method has the characteristics of waste utilization, economy, environmental protection and easy application to industrial production; the film material is preliminarily prepared by utilizing the obtained LCNF, the film material has relatively high transmission in a visible light region, the transmissivity in an ultraviolet light region is close to 0, and due to the characteristic, the material has relatively good application potential in the fields of food packaging materials, electronic products and the like. The method of combining oxygen-alkali chemical pretreatment with mechanical treatment is adopted, and the preparation process has the advantages of environmental friendliness and low energy consumption.

Description

technical field [0001] The invention belongs to the fields of natural polymers, forestry engineering, packaging engineering and new materials, and in particular relates to a preparation method and product of mild and green lignin-containing nano-cellulose fibrils. Background technique [0002] Direct conversion of low-cost plant biomass resources into nanocellulose can generate a new type of nanocellulose material, termed lignin-containing nanocellulose fibrils (LCNF). LCNF has been proven to be a promising biomass-based material due to its high yield, low cost, and low environmental impact. The retained lignin in LCNFs is beneficial to the enhancement of hydrophobicity, decrease of polarity and enhancement of thermal stability of LCNFs. Most of the current LCNF preparation methods directly use unbleached pulp and then mechanically treat and nanonize it with high bonding strength. However, according to the performance characterization of LCNF with low lignin content, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/02D21B1/30D01F2/00D01F1/10
CPCD21C5/00D21C3/022D21C3/026D21B1/30D01F2/00D01F1/10
Inventor 岳凤霞姚露胡松楠林敏生
Owner SOUTH CHINA UNIV OF TECH
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