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A kind of preparation method of lignin nanoparticle

A nano-particle and lignin technology is applied in the field of preparation of lignin nano-particles, which can solve the problems of difficulty in obtaining, expensive ionic liquid, and difficult to popularize the application of nano-lignin, and achieves improved performance, wide source, and improved application. range effect

Inactive Publication Date: 2014-10-29
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using ionic liquids as solvents can effectively shield the self-polymerization of phenolic hydroxyl groups of lignin during the treatment process, but ionic liquids are expensive and not easy to obtain, so it is difficult to promote the application of nano-lignins

Method used

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  • A kind of preparation method of lignin nanoparticle
  • A kind of preparation method of lignin nanoparticle
  • A kind of preparation method of lignin nanoparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of lignin nanoparticle of the present invention comprises the following steps:

[0026] (1) Pretreatment of lignin raw materials: Take 10 parts of ethanol lignin and dissolve it in 180 parts of glycerol organic solvent, heat to 30°C, stir for 2 hours to fully dissolve lignin, and filter to remove the lignin in the raw material Insoluble matter was obtained as a filtrate.

[0027] (2) Preparation of lignin sol: Take 10 parts by mass of the filtrate obtained in the above step (1), add hydrochloric acid dropwise thereto at a certain speed until pH=2, keep stirring to obtain lignin colloid.

[0028] (3) Cross-linking reaction: Take 50 parts by mass of the lignin colloid obtained in step (2), heat it in a water bath to 40°C, add 0.5 parts by mass of glutaraldehyde as a cross-linking agent dropwise, stir for 2 hours, and the lignin colloid Cross-linking reaction with glutaraldehyde, after the reaction is completed, cool to room temperature, add water d...

Embodiment 2

[0030] (1) Pretreatment of lignin raw materials: Take 15 parts of alkali lignin by mass and dissolve it in 270 parts of ethylene glycol and propylene glycol (60 / 40) organic solvent, heat to 50°C, stir for 1 hour to fully dissolve lignin , and filtered to remove insoluble matter in the raw material to obtain a filtrate.

[0031] (2) Preparation of lignin sol: Take 30 parts by mass of the filtrate obtained in the above step (1), add sulfuric acid and hydrochloric acid dropwise thereto at a certain speed until pH=2.5, keep stirring to obtain lignin colloid.

[0032] (3) Cross-linking reaction: Take 100 parts by mass of the lignin colloid obtained in step (2), heat it in a water bath to 30°C, add 1 part by mass of acetaldehyde and butyraldehyde (1:1) to it, and stir for 1.5 hours. The lignin colloid and the cross-linking agent undergo a cross-linking reaction. After the reaction is completed, cool to room temperature, add distilled water dropwise to it, so that the cross-linked pr...

Embodiment 3

[0034] (1) Pretreatment of lignin raw materials: Take 20 parts of alkali lignin by mass and dissolve it in 400 parts of dichloromethane and ethylene glycol (20 / 80) organic solvent, heat to 40°C, stir for 1 hour to make lignin The element was fully dissolved, and the insoluble matter in the raw material was removed by filtration to obtain a filtrate.

[0035](2) Preparation of lignin sol: Take 15 parts by mass of the filtrate obtained in the above step (1), add hydrochloric acid and phosphoric acid to it dropwise at a certain speed until pH=2.2, keep stirring to obtain lignin colloid.

[0036] (3) Cross-linking reaction: Take 50 parts by mass of the lignin colloid obtained in step (2), heat it in a water bath to 40°C, add 0.5 parts by mass of butyraldehyde and adipaldehyde (1:1) cross-linking agent to it, and stir After 1 hour, the lignin colloid and the cross-linking agent undergo a cross-linking reaction. After the reaction is completed, cool to room temperature, add water dr...

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Abstract

The invention discloses a preparation method of a lignin nanoparticle and belongs to the chemical field of nanometer materials. The preparation method comprises the following steps of: dissolving a lignin raw material through an organic solvent; removing impurities; dropwise adding a proper amount of inorganic acid into filtrate to form lignin colloid; adding a cross-linking agent to perform cross-linking reaction with the lignin colloid; and adding water and stirring to dialyze to form lots of lignin nanoparticles of which the particle size is between 20nm to 200nm. The prepared lignin nanoparticle is excellent in dispersing performance and absorbing performance, and is expected to be applied to dispersing agents for wastewater treatment, dye, pesticide, water-coal-slurry systems and the like. The preparation method, disclosed by the invention, is simple and feasible; all the adopted solutions can be recovered, no adverse impacts are brought to the environment, and good application prospect is provided.

Description

technical field [0001] The invention relates to the field of nanometer material chemistry, in particular to a method for preparing lignin nanoparticles. Background technique [0002] Lignin is the main component of the plant skeleton together with cellulose and hemicellulose, and its main function is to bind the cellulose together and provide support for plant growth. Lignin is the second most abundant biomass resource on earth after cellulose. The structure of lignin is very complex. It is a three-dimensional amorphous polymer. Its molecule has both benzene ring and carbon chain. The carbon chain usually contains hydroxyl, aldehyde, ketone, carboxyl, etc., and the benzene ring It also contains hydroxyl groups and a large number of methoxy groups. Industrial lignin mainly enters the environment as a by-product of the paper pulping industry and wood hydrolysis industry. If it is not used as a resource, it will pollute the environment. Therefore, no matter from resource uti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08J3/12C08L97/00C08K5/07
CPCY02P20/582C08L97/005C08H6/00
Inventor 李志礼葛圆圆肖多
Owner GUANGXI UNIV
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