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Method for extracting and preparing lignin composite nano fibers in situ

A technology of lignocellulose and lignin, which is applied to the chemical characteristics of fibers, conjugated artificial filaments, textiles and papermaking, etc., can solve the problems of not being able to obtain smooth fibers, complex extraction of industrial lignin, and unfavorable widespread use, and achieve Effects of reducing waste output, increasing added value, and improving efficiency

Inactive Publication Date: 2015-09-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the solvent used is toxic and the process is complicated, which is not conducive to widespread use
Kadla et al. (Dallmeyera I, Frank K, Kadlaa J.F.Journal of Wood Chemistry and Technology, 2012, 30(4): 315-329) conducted research on industrial lignin obtained from seven different materials and different preparation methods. No smooth fiber can be obtained by spinning any kind of industrial lignin, and the extraction of industrial lignin is complicated

Method used

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  • Method for extracting and preparing lignin composite nano fibers in situ
  • Method for extracting and preparing lignin composite nano fibers in situ
  • Method for extracting and preparing lignin composite nano fibers in situ

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Embodiment 1

[0037] The invention provides a method for in-situ extraction and preparation of lignin / synthetic polymer composite nanofibers using natural lignocellulosic biomass as raw material, which is carried out according to the following steps:

[0038] (1) Using natural lignocellulose as raw material;

[0039] (2) Dissolving natural lignocellulose in a blended electrolyte composed of ionic liquid and organic solvent;

[0040] (3) Precipitate cellulose and hemicellulose in lignocellulose with anti-solvent, separate and concentrate to obtain lignin electrolyte solution;

[0041] (4) The synthetic polymer added in the lignin electrolyte solution to obtain the lignin-synthetic polymer electrolyte spinning stock solution;

[0042] (5) Electrospinning the obtained lignin-synthetic polymer electrolyte spinning dope by electrospinning technology to obtain lignin blended nanofibers.

[0043] Specific technical process such as figure 1 .

Embodiment 2

[0045] Weigh 20 g of corn stalks with a particle size of 0.1 μm, and add them into a round-bottomed flask filled with 200 g of [Emim][Ac] / DMSO organic electrolyte solvent (the molar fraction of ionic liquid in the organic electrolyte is 20%) ([Emim] ][Ac]=1-methyl-3-ethyl-imidazole acetate), mechanically stirred and dissolved in a constant temperature oil bath at 80°C for 1h, then regenerated with 500ml of anti-solvent methanol, and filtered the filter residue with 300ml of Methanol was washed and stirred three times, so as to further remove the ionic liquid and DMSO residues in the regenerated biomass material. After removing the anti-solvent methanol in the filtrate with a rotary evaporator, a solution of extracted lignin [Emim][Ac] / DMSO with a dissolved mass concentration of 1.1 wt% was obtained. Add 7.7g PAN into this solution, dissolve and prepare lignin-PAN electrospinning stock solution. Pass the prepared corn stalk lignin / PAN spinning solution through a high-voltage e...

Embodiment 3

[0047] Weigh 20g of poplar wood powder with a particle size of 0.5 microns, and add it to a round-bottomed flask filled with 200g of [Emim][Ac] / DMF organic electrolyte solvent (the molar fraction of the ionic liquid in the organic electrolyte is 5%), 180 ℃ mechanical stirring and dissolving in a constant temperature oil bath for 3 hours, and then regenerated with 400ml of anti-solvent ethanol. After filtration, the filter residue was washed and stirred three times with 200ml of ethanol respectively, so as to further remove the ionic liquid and DMSO residue in the regenerated biomass material. After removing the anti-solvent ethanol in the filtrate with a rotary evaporator, a solution with a dissolved mass concentration of 1.9% extracted lignin [Emim][Ac] / DMF was obtained. Add 6.2g PAN into this solution, dissolve and prepare lignin-PAN electrospinning stock solution. Pass the prepared corn stalk lignin / PAN spinning solution through a high-voltage electrospinning machine, set v...

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Abstract

The invention provides a method for extracting and preparing lignin composite nano fibers in situ, which takes natural lignocellulose biomasses as raw materials. The method comprises the following steps: (1) taking natural lignocellulose as the raw materials; (2) dissolving the natural lignocellulose and extracting lignin by taking a commixed electrolyte solution composed of ion liquid / an organic solvent as a solvent; (3) precipitating cellulose and semi-cellulose in the natural lignocellulose by an anti-solvent, and separating to obtain a lignin electrolyte solution; (4) adding with synthesized polymers at different parts relative to the lignin into the obtained lignin electrolyte solution to obtain a lignin-synthesized polymer electrolyte electrostatic spinning raw solution; and (5) preparing the lignin composite nano fibers by using the spinning solution through an electrostatic spinning technology. According to the method provided by the invention, all components in corn straws can be efficiently utilized; a technological process is simple and the dissolving can be recycled; the method is pollution-free and environmentally friendly, and economical and energy-saving properties are realized; and the prepared lignin-based electrostatic spinning composite fibers are uniform and continuous, have good thermal stability and can be biologically degraded.

Description

technical field [0001] The invention relates to a new method for preparing lignin composite nanofibers by extracting lignin in situ, and belongs to the field of biomass utilization and new materials. Background technique [0002] In order to maintain the sustainable development of human civilization, human beings must find a substitute for fossil resources to meet the growing material culture and living needs of human beings. According to statistics, the annual global biomass production exceeds 2x1010 tons, of which 90% exists in the form of lignocellulose. According to statistics, by 2025, 25%-30% of the raw materials of the global chemical industry will come from biomass resources. Lignocellulose is mainly composed of cellulose (35-50%), hemicellulose (35%) and lignin (15-30%), and its chemical composition varies with the type of biomass, the place of origin and the stage of plant cell development different from each other. Cellulose and hemicellulose have been extensiv...

Claims

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Application Information

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IPC IPC(8): D01F8/18C08H7/00
CPCD01F9/17Y02P20/54
Inventor 谢海波赵宗保解相婧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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