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Method for preparing lignin hydrogel

A technology of lignin and hydrogel, applied in the field of preparation of lignin hydrogel, can solve the problems of poor mechanical properties, poor dye adsorption performance, etc., achieve high compressive tensile strength, biocompatibility, environmental friendliness, and preparation short cycle effect

Pending Publication Date: 2019-02-19
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of traditional hydrogels such as poor mechanical properties and poor dye adsorption performance, and to provide a preparation method of lignin hydrogel for sewage treatment, using lignin nanoparticles as crosslinking points, The nanocomposite hydrogel is prepared by simple and easy-to-control in-situ free radical polymerization. The composite hydrogel has high compressive and tensile strength, and has excellent adsorption performance. The preparation method is simple and can be used for sewage treatment, etc. field

Method used

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  • Method for preparing lignin hydrogel
  • Method for preparing lignin hydrogel
  • Method for preparing lignin hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using the frequency of 25kHz, under the power of 800W, the lignin aqueous solution was subjected to ultrasonic treatment for 60 minutes by an ultrasonic probe (JY98-3D, Ningbo Xinzhi Biotechnology Co., Ltd.), to prepare a lignin nanoparticle suspension; 1.7g Acrylamide monomer and 0.01g N,N'-methylenebisacrylamide were mixed with 3mL lignin nanoparticle suspension, and after stirring the mixture for 15 minutes, 100μL ascorbic acid (AA, 6wt%) and 100μL Hydrogen peroxide (H 2 o 2 , 30wt%) aqueous solution as the initiator. The reaction was stirred for an additional 30 minutes in order to thoroughly mix the components. Finally, the uniformly mixed reaction solution was placed in a water bath environment at 70°C for free radical polymerization. After 9 hours of reaction, the prepared hydrogel was soaked in deionized water for 48 hours to remove unreacted monomers and other Impurities.

[0029] Scanning electron microscope analysis was performed on the lignin hydrogel ob...

Embodiment 2

[0032] Using a frequency of 25kHz and a power of 800W, an ultrasonic probe (JY98-3D, Ningbo Xinzhi Biotechnology Co., Ltd.) was used to ultrasonicate the lignin aqueous solution for 60 minutes to prepare multiple groups of lignin nanoparticle suspensions with different contents. liquid; mix 1.7g of acrylamide monomer and 0.01g of N,N'-methylenebisacrylamide with 3mL of lignin nanoparticle (4.5wt%) suspension, stir the mixture for 15 minutes, then add 100 μL of an aqueous solution of ammonium persulfate (6wt%) was used as an initiator; in order to fully mix the components, the reaction solution was stirred for another 30 minutes, and finally, the uniformly mixed reaction solution was placed in a water bath environment at 70°C for free radical polymerization , after reacting for 9 hours, the prepared hydrogel was soaked in deionized water for 48 hours to remove unreacted monomers and other impurities.

[0033] Replace the lignin nanoparticle suspensions with solid contents of 8....

Embodiment 3

[0037] Using the frequency of 25kHz, under the power of 800W, the lignin aqueous solution was subjected to ultrasonic treatment for 60 minutes by an ultrasonic probe (JY98-3D, Ningbo Xinzhi Biotechnology Co., Ltd.), to prepare a lignin nanoparticle suspension; 1.7g Acrylamide monomer and 0.01 g of N,N'-methylenebisacrylamide were mixed with 3 mL of lignin nanoparticle suspension, and after stirring the mixture for 15 minutes, 100 μL of potassium persulfate solution was added to the mixture as an initiator. The reaction was stirred for an additional 30 minutes in order to thoroughly mix the components. Finally, the uniformly mixed reaction solution was placed in a water bath environment at 70°C for free radical polymerization. After 9 hours of reaction, the prepared hydrogel was soaked in deionized water for 48 hours to remove unreacted monomers and other Impurities.

[0038]Compression performance tests were carried out on the lignin hydrogel prepared in this example and the ...

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Abstract

The invention discloses a method for preparing lignin hydrogel. The method has the advantages that lignin nanometer particles are used as cross-linking points, simple in-situ free radical polymerization reaction which is easy to control is carried out to prepare the lignin hydrogel, the lignin hydrogel which is composite hydrogel is high in compressive and tensile strength and excellent in adsorption performance, and the method is simple and can be used in the field of sewage treatment and the like; the lignin hydrogel is mainly prepared from lignin which is industrial waste, the lignin can come from extensive sources and is easy to acquire, and accordingly the lignin hydrogel is low in production cost; the method includes simple preparation steps and is short in preparation period and favorable for popularizing and utilizing the lignin hydrogel on a large scale.

Description

technical field [0001] The invention belongs to the technical field of biopolymer materials, and in particular relates to a preparation method of lignin hydrogel. Background technique [0002] Hydrogel refers to a kind of polymer material that can absorb and maintain a large amount of water but is insoluble in water and has a certain three-dimensional structure. It contains water-soluble polymers with a network structure, and there are hydrophobic groups and Hydrophilic groups combine with water molecules to connect water molecules inside the network, while hydrophobic groups swell with water to form a network structure that locks water molecules and keeps them at a certain water content. Due to the existence of the special three-dimensional network system of the hydrogel, it is soft in nature, can maintain a certain shape, and has a high water content. Therefore, it is widely used in drug carrier, tissue engineering, sewage treatment and other fields. However, the poor me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/56
CPCC08F289/00C08F220/56
Inventor 陈莹沈丽钰陈诗燕盛秋月付帅
Owner NANJING UNIV OF POSTS & TELECOMM
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