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Lignin fiber aerogel as well as preparation method and application thereof

A technology of lignin fibers and aerogels, which is applied in the chemical characteristics of fibers, textiles and papermaking, hybrid capacitor electrodes, etc., can solve the problems of flammability and explosion of electrospinning devices, and achieve the effect of saving costs and resources

Active Publication Date: 2021-04-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lignin fiber airgel and its preparation in order to solve the problem that the existing electrospinning method for synthesizing lignin fiber requires the use of toxic solvents, and the electrospinning device is inflammable and explosive. Methods and Applications

Method used

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  • Lignin fiber aerogel as well as preparation method and application thereof
  • Lignin fiber aerogel as well as preparation method and application thereof
  • Lignin fiber aerogel as well as preparation method and application thereof

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preparation example Construction

[0027] The present invention provides a kind of preparation method of lignocellulosic airgel, the method comprises:

[0028] Step 1: Use a deep eutectic solvent to dissolve the linear polymer, and after mixing evenly, continue to dissolve the lignin to form a uniform solution as the electrospinning solution;

[0029] Described deep eutectic solvent is choline chloride base deep eutectic solvent or betaine base deep eutectic solvent; Described chloride choline base deep eutectic solvent is preferably choline chloride and malic acid, oxalic acid or A mixture of lactic acids. In the mixture of choline chloride and malic acid, oxalic acid or lactic acid, the molar ratio of choline chloride to malic acid, oxalic acid or lactic acid is preferably 1:2-10.

[0030] The betaine deep eutectic solvent is a mixture of betaine and lactic acid or malic acid; in the mixture of betaine and lactic acid or malic acid, the molar ratio of betaine and lactic acid or malic acid is preferably 1:2 ...

Embodiment 1

[0041] (1) Use the choline chloride-lactic acid deep eutectic solvent to dissolve the polyvinyl alcohol polymer, and after mixing evenly, continue to dissolve the lignin to form a uniform solution as the spinning solution for electrospinning. The mass ratio of deep eutectic solvent, polyvinyl alcohol, and lignin is 1:0.02:0.1, and the molar ratio of choline chloride and lactic acid in choline chloride-lactic acid is 1:2.

[0042] (2) Use a plastic syringe to inhale the spinning solution prepared in step (1), install a metal needle, set up the electrospinning device vertically, and spray filaments downward. The plastic basin filled with water is used as the receiving device (water bath) below, and the inside is covered with metal foil and grounded, and the stirring bar is placed under the water to stir slowly during the electrospinning process. The needle is 10cm above the water surface. During the electrospinning process, the voltage was set at 15 kV, the temperature was 25 °...

Embodiment 2

[0046] (1) Use the betaine-lactic acid deep eutectic solvent to dissolve the polyvinylpyrrolidone macromolecule, and after mixing evenly, continue to dissolve the lignin to form a uniform solution as the spinning solution for electrospinning. The content mass ratio of deep eutectic solvent, polyvinylpyrrolidone and lignin is 1:0.02:0.15, wherein the molar ratio of betaine and lactic acid in betaine-lactic acid is 1:2.

[0047] (2) Use a plastic syringe to inhale the spinning solution prepared in step (1), install a metal needle, set up the electrospinning device vertically, and spray filaments downward. The plastic basin filled with water is used as the receiving device (water bath) below, and the inside is covered with metal foil and grounded, and the stirring bar is placed under the water to stir slowly during the electrospinning process. The needle is 10cm above the water surface. During the electrospinning process, the voltage was set at 15 kV, the temperature was 25 °C, ...

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Abstract

The invention provides lignin fiber aerogel as well as a preparation method and application thereof, and belongs to the technical field of lignin fiber synthesis methods. The method comprises the following steps of: dissolving linear macromolecules by using a deep eutectic solvent, uniformly mixing, and continuing to dissolve lignin to form a uniform solution serving as a to-be-spun solution for electrospinning; carrying out electrospinning on the to-be-spun solution by adopting an electrospinning device, and performing receiving by adopting a water bath device below the electrospinning device to obtain a lignocellulose mixture; and finally, standing the obtained lignocellulose mixture, and carrying out post-treatment to obtain the lignin fiber aerogel. The invention also provides the lignin fiber aerogel prepared by the preparation method. The invention also provides an application of the lignin fiber aerogel in an electrode material of a supercapacitor. The lignin-based carbon fiber aerogel obtained by pre-oxidizing and carbonizing the lignin fiber aerogel has high relative specific surface area and porosity.

Description

technical field [0001] The invention belongs to the technical field of lignin fiber synthesis methods, and in particular relates to a lignin fiber airgel and its preparation method and application. Background technique [0002] Lignin is widely found in trees and other plants. It is a renewable resource. It is a polymer composed of three monomers (p-coumaryl alcohol, coniferyl alcohol and sinapyl alcohol). It is usually insoluble in water, ethanol and other common organic compounds. solvent. In the traditional paper industry, a large amount of lignin is used as waste to form "black liquor", which is discharged into rivers and water bodies by illegal enterprises, polluting the environment. The current mainstream way to deal with "black liquor" is to use alkali recovery to recover lignin and burn it as fuel, which does not fully utilize the value of lignin as a renewable resource. Lignin can be further processed into modified lignin such as alkaline lignin, which can be used...

Claims

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Application Information

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IPC IPC(8): C08L97/00C08L29/04C08L39/06C08J9/28D01F9/17D01F9/21D01F9/24H01G11/24H01G11/34H01G11/40
CPCC08J9/28D01F9/17D01F9/21D01F9/24H01G11/24H01G11/34H01G11/40C08J2205/026C08J2201/0484C08J2397/00C08J2429/04C08J2439/06Y02E60/13
Inventor 方幼兴董绍俊荣凯
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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