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Micro-nano lignocellulose, preparation method and applications thereof

A lignocellulose, micro-nano technology, applied in the fields of cellulose pulp post-treatment modification, fiber raw material treatment, textiles and papermaking, etc., can solve the problems of cumbersome and complicated preparation process, large environmental impact, cumbersome steps, etc., and achieve application Wide range, strong continuity, and the effect of weakening the hydrogen bond

Active Publication Date: 2019-07-26
山东省圣泉生物质石墨烯研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the hard lignin is interwoven in the middle of the cellulose, it cannot be directly mechanically peeled off to prepare nanocellulose. There is no method for preparing nanocellulose with high lignin content in the current method of preparing nanocellulose.
In the prior art, it is still necessary to pretreat the plant fiber with acid, alkali or organic solvent to remove lignin and hemicellulose, and then perform mechanical peeling. The steps are cumbersome, and the acid, alkali or organic solvent used in the pretreatment process is still cause some pollution to the environment
[0005] CN 101949103A discloses a method for preparing micro-nano cellulose, which is directly prepared by plant straw, but still uses a delignification agent for delignification treatment; CN 103194027A discloses a nano-cellulose / lignin light-blocking The preparation method of the membrane obtains nano-cellulose materials with high lignin content, but in the preparation process, it is necessary to remove and extract lignin, then perform cellulose nano-processing, and then mix lignin and nano-cellulose, and the preparation process is cumbersome and complicated; CN104693464A Disclosed is a method for preparing lignocellulose-reinforced polylactic acid composite membranes, which adopts sulfuric acid hydrolysis-high-pressure homogenization method to prepare lignocellulose. Sulfuric acid is used in this process, which has a great impact on the environment

Method used

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  • Micro-nano lignocellulose, preparation method and applications thereof
  • Micro-nano lignocellulose, preparation method and applications thereof
  • Micro-nano lignocellulose, preparation method and applications thereof

Examples

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Embodiment 1

[0059] In this embodiment, the lignin content in the micronano lignocellulose is 22%, the cellulose diameter is 110 nm, and the aspect ratio is 212. The lignin is combined with the cellulose in the form of hydrogen bonds and chemical bonds.

[0060] Its preparation method specifically comprises the following steps:

[0061] (1) Take by weighing 10g xylose residue (wherein the lignin content in the xylose residue is 25wt%, the cellulose content is 70wt%, and the hemicellulose content is 5wt%) and is dissolved in 490mL 5mol / L urea aqueous solution, is heated to 72 °C and stir evenly to obtain a raw material dispersion of xylose residue;

[0062] (2) Place the xylose residue raw material dispersion liquid obtained in step (1) in a sand mill, and keep the temperature of the raw material dispersion liquid at 72° C. and circulate sand mill once to obtain a peeled object with a diameter of about 500 nm;

[0063] (3) Transfer the exfoliation prepared in step (2) to a high-pressure ho...

Embodiment 2

[0066] In this embodiment, the lignin content in the micronano lignocellulose is 25%, the cellulose diameter is 69nm, and the aspect ratio is 351. The lignin is combined with the cellulose in the form of hydrogen bonds and chemical bonds.

[0067] Its preparation method specifically comprises the following steps:

[0068] (1) Take by weighing 10g xylose residue (wherein the lignin content is 25wt% in the xylose residue, the cellulose content is 70wt%, and the hemicellulose content is 5wt%) and is dissolved in 490mL 10mol / L urea aqueous solution, is heated to 80 °C and stir evenly to obtain a raw material dispersion of xylose residue;

[0069] (2) Put the xylose residue raw material dispersion liquid obtained in step (1) in a sand mill, and keep the temperature of the raw material dispersion liquid at 80° C. and circulate sand mill once to obtain a stripped object with a diameter of about 500 nm;

[0070] (3) Transfer the exfoliated material prepared in step (2) to a high-pres...

Embodiment 3

[0072] In this embodiment, the lignin content in the micronano lignocellulose is 28%, the cellulose diameter is 88nm, and the aspect ratio is 298. The lignin is combined with the cellulose in the form of hydrogen bonds and chemical bonds.

[0073] Its preparation method specifically comprises the following steps:

[0074] (1) Weigh 10g of xylose residue (wherein the lignin content in the xylose residue is 28wt%, and the cellulose content is 72wt%), dissolve it in 490mL 5mol / L urea aqueous solution, heat to 80°C and stir evenly to obtain the xylose residue raw material dispersion;

[0075] (2) Place the xylose residue raw material dispersion liquid obtained in step (1) in a sand mill, and keep the temperature of the dispersion liquid at 80° C. and circulate sand mill once to obtain a stripped object with a diameter of about 400 nm;

[0076] (3) Transfer the exfoliation prepared in step (2) to a high-pressure homogenizer, and under the pressure of 60MPa, keep the solution tempe...

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Abstract

The invention provides micro-nano lignocellulose, a preparation method and applications thereof. The micro-nano lignocelluloses contain lignin structures; lignin is bonded with cellulose through hydrogen bonds and chemical bonds. The preparation method comprises following steps: a lignin containing cellulose raw material is dispersed in a hot urea aqueous solution so as to obtain a cellulose raw material dispersion liquid; mechanical pre-treatment is adopted for peeling and grinding so as to obtain a pre-treatment product; and the pre-treatment product is subjected to high pressure homogenizing using a high pressure homogenizer so as to obtain a micro-nano lignocelluloses dispersion liquid. According to the preparation method, removing of the lignin in the lignin containing cellulose raw material is not needed, the hot urea aqueous solution is combined with mechanical pre-treatment and high pressure homogenizing so as to prepare the product; the diameter of the obtained micro-nano lignocelluloses ranges from 5 to 180nm; the length / diameter ratio is 200 or larger; the lignin content ranges from 10 to 35wt%; micro-nano cellulose performance is improved; and the application prospect is promising.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and relates to a micronano lignocellulose and its preparation method and application. Background technique [0002] With the continuous development of social economy, non-renewable resources such as petroleum and coal are increasingly scarce, and problems such as environmental pollution have become increasingly prominent. The application of renewable resources in various fields has attracted more and more attention. Plant fiber raw material is the most important biomass resource on the earth, and its efficient and comprehensive utilization will occupy an extremely important position in the entire biomass industry. Plant fibers are mainly composed of cellulose, lignin and hemicellulose. Cellulose is a ubiquitous and renewable resource on earth. Nanocellulose prepared from natural cellulose not only has huge specific surface area, high hydrophilicity, high Young's modulus, high strength, g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21H11/16C08L23/12C08L97/02
CPCC08L23/12D21C5/00D21H11/16C08L97/02
Inventor 张金柱王鹏辉唐地源张安刘顶梁蒙蒙
Owner 山东省圣泉生物质石墨烯研究院
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