A preparation method of high-strength lignin hydrogel with adjustable mechanical properties

A lignin and high-strength technology, applied in the field of preparation of high-strength lignin hydrogel, can solve the problems of poor mechanical strength and achieve the effect of overcoming poor mechanical properties

Active Publication Date: 2022-05-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of high-strength lignin hydrogel with adjustable mechanical properties, which solves the problem of poor mechanical strength of existing lignin hydrogel

Method used

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  • A preparation method of high-strength lignin hydrogel with adjustable mechanical properties
  • A preparation method of high-strength lignin hydrogel with adjustable mechanical properties
  • A preparation method of high-strength lignin hydrogel with adjustable mechanical properties

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Embodiment 1

[0047] The preparation method of a high-strength lignin hydrogel with adjustable mechanical properties of the present invention is specifically implemented according to the following steps:

[0048] Step 1, adding n-isopropylacrylamide into N,N-dimethylformamide, mixing evenly, then adding hydrogen peroxide, fully stirring to dissolve completely, and obtaining a polymer monomer solution;

[0049] Among them, the mass ratio of n-isopropylacrylamide, N,N-dimethylformamide and hydrogen peroxide is 10:1:0.001;

[0050] Step 2, the polymer monomer solution that obtains after step 1 is in N 2 The reaction is carried out in an atmosphere; the reaction temperature is 50°C-80°C, and the reaction time is 2h-4h; that is, free radical polymerization is carried out to obtain a long-chain polymer solution, and then the long-chain polymer solution is evaporated to dryness at a temperature of 25°C , to obtain polymer solids;

[0051] Step 3, adding alkali lignin to N,N-dimethylformamide to ...

Embodiment 2

[0056] The preparation method of a high-strength lignin hydrogel with adjustable mechanical properties of the present invention is specifically implemented according to the following steps:

[0057] Step 1, add methacrylic acid to N,N-dimethylformamide, mix well, then add ammonium persulfate, sulfate lignin and polyethylene glycol diglycidyl ether, stir well to dissolve completely , to obtain a polymer monomer solution;

[0058] Among them, the mass ratio of methacrylic acid, N,N-dimethylformamide, ammonium persulfate, sulfate lignin and polyethylene glycol diglycidyl ether is 10:10:0.002:1:0.1;

[0059] Step 2, the polymer monomer solution that obtains after step 1 is in N 2 The reaction is carried out in an atmosphere; the reaction temperature is 60°C, and the reaction time is 2.5h; that is, free radical polymerization (photoinitiated polymerization, thermally induced polymerization, redox polymerization) is carried out to obtain a long-chain polymer solution, and then the ...

Embodiment 3

[0065] The preparation method of a high-strength lignin hydrogel with adjustable mechanical properties of the present invention is specifically implemented according to the following steps:

[0066] Step 1, add dimethacrylic acid to N,N-dimethylacetamide, mix well, then add potassium persulfate, enzymatic lignin and N-hydroxysuccinimide, stir well to dissolve completely , to obtain a polymer monomer solution;

[0067] Among them, the mass ratio of dimethacrylic acid, N,N-dimethylacetamide, potassium persulfate, enzymatic lignin and N-hydroxysuccinimide is 10:50:0.005:2:0.2;

[0068] Step 2, the polymer monomer solution that obtains after step 1 is in N 2 The reaction was carried out in an atmosphere; the reaction temperature was 80°C, and the reaction time was 4 hours; that is, free radical polymerization (light-induced polymerization, heat-induced polymerization, redox polymerization) was carried out to obtain a long-chain polymer solution, and then the long-chain polymer so...

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Abstract

The invention discloses a preparation method of a high-strength lignin hydrogel with adjustable mechanical properties, specifically: firstly, adding a polymer monomer into a solvent A, and then adding an initiator, lignin and a crosslinking agent , stir to dissolve completely, and obtain a polymer monomer solution; put the polymer monomer solution in N 2 React in an atmosphere to obtain a polymer long-chain solution, and then evaporate the polymer long-chain solution to dryness to obtain a polymer solid; then add lignin to solvent B to obtain a lignin solution, and then add it to the polymer Dissolving in the solid matter, and evaporating the solvent after complete dissolution; finally adding the obtained lignin xerogel to deionized water for swelling to obtain a high-strength lignin hydrogel. The high-strength lignin hydrogel prepared by the method overcomes the disadvantages of poor mechanical properties of the traditional lignin hydrogel, the tensile stress can reach 0.1-5.0 MPa, and the strain can reach 200%-2000%.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrogel materials, and in particular relates to a preparation method of high-strength lignin hydrogel with adjustable mechanical properties. Background technique [0002] Hydrogel is a kind of soft material formed in water after cross-linking of hydrophilic polymers. Due to the high water content of hydrogel, it can be applied in many fields, such as tissue engineering, drug sustained release, flexible electronic devices and other fields. However, the poor mechanical properties of conventional hydrogels limit their applications to a large extent. [0003] Compared with traditional hydrogels, high-strength hydrogels not only maintain the advantages of high water content of hydrogel materials, but also improve their own mechanical properties, and have broad application prospects. During the preparation process, the researchers realized high-strength hydrogels enhanced by "semi-interpenetra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/24C08L97/00C08L71/02C08F289/00C08F220/54C08F220/06
CPCC08J3/075C08J3/24C08F289/00C08J2397/00C08J2471/02C08F220/54C08F220/06
Inventor 游翔宇王雪莲张慧洁
Owner SHAANXI UNIV OF SCI & TECH
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