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Micro-nano cellulose compound, preparation method and applications thereof

A technology of micro-nano cellulose and composites, which is applied in the field of nano-cellulose modification, can solve the problems of uneven agglomeration and dispersion, poor compatibility, cumbersome steps, etc., and achieve the goal of improving compatibility, promoting peeling, and weakening interaction Effect

Inactive 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 is impossible to prepare nanocellulose by simple direct mechanical exfoliation. Currently, there is no method for preparing nanocellulose with high lignin content.
In the prior art, it is still necessary to pretreat the plant fiber with acid and alkali 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 still causes environmental pollution certain pollution
[0005] In addition, the micro-nano cellulose composite prepared by the prior art has poor compatibility with oily substances (such as high molecular polymers or polymerized monomers), and there is a problem of uneven agglomeration and dispersion when compounded with high molecular polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing a micro-nano cellulose composite, comprising the steps of:

[0048] (1) 10g xylose residue (containing 70wt% cellulose, 28wt% lignin and 2wt% hemicellulose) and 0.5g graphene (the average thickness of the sheet is 5nm ) was dispersed in 200mL water, and mixed uniformly to obtain a dispersion;

[0049] (2) Put the dispersion liquid in a ball mill for pre-stripping to obtain a pre-stripping product dispersion (with a diameter of 200-1500nm for the peeling product);

[0050] (3) Place the pre-stripping product dispersion in a high-pressure homogenizer for 3 cycles of 130MPa cyclic peeling to obtain a nanocellulose composite dispersion with a diameter of 5 to 20 nm and a lignin content of 28%; the micro-nano fibers The concentration of the plain dispersion liquid is 4.8wt%, the diameter of the micro-nano cellulose is in the range of 3-7nm, and the range of the aspect ratio is 230-260.

Embodiment 2

[0052] The difference from Example 1 is that the equal mass replacement xylose residue is the xylose residue after extracting hemicellulose from corn stalks (containing 65wt% cellulose, 25wt% lignin, and 10wt% hemicellulose).

[0053] The concentration of the micro-nanocellulose dispersion obtained in Example 2 is 4.8 wt%, the diameter of the micro-nanocellulose is in the range of 20-40 nm, and the aspect ratio is in the range of 340-380.

Embodiment 3

[0055] The difference from Example 1 is that the equal mass replacement xylose residue is the xylose residue after extracting hemicellulose from wood (containing 65wt% cellulose, 30wt% lignin, and 5wt% hemicellulose).

[0056] The concentration of the micro-nanocellulose dispersion obtained in Example 3 is 4.5 wt%, the diameter of the micro-nanocellulose is in the range of 10-20 nm, and the aspect ratio is in the range of 240-250.

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Abstract

The invention relates to a micro-nano cellulose compound. The micro-nano cellulose compound comprises micro-nano lignocelluloses, and graphene material dispersed in the micro-nano lignocelluloses; themicro-nano lignocellulose comprises 10 to 35wt% of lignin. According to the preparation method, utilization of the thin layer characteristic of graphene material is adopted, the graphene material ismixed with the cellulose raw material containing lignin, so that intercalation of the graphene material into the cellulose raw material containing lignin is realized, synergistic lignin peeling is realized, and the micro-nano lignocelluloses is obtained. In the whole process, no chemical agent is used; operation is simple and easy to control; in the preparation method, graphene is adopted for intercalation, lignin degradation pre-treatment of the cellulose raw material containing lignin is not needed, and the micro-nano cellulose compound is obtained through direct peeling, the preparation isfriendly to the environment, and no pollution is caused. In the preparation method, mechanical pre-treatment and high pressure homogenizing are combined to prepare the micro-nano cellulose compound, so that blocking of high pressure homogenizers in crushing process can be avoided, and wearing is reduced.

Description

technical field [0001] The invention belongs to the field of nano-cellulose modification, and specifically relates to a micro-nano cellulose composite, a preparation method and an 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 modul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08L97/00C08K7/00C08K3/04
CPCC08L1/02C08L97/005C08K7/00C08K3/04
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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