Micro-nano lignocellulose as well as preparation method and application thereof

Abstract

The invention relates to a preparation method of micro-nano lignocellulose, which comprises the following steps: (1) dispersing a lignin-containing cellulose raw material in an aqueous solution with the temperature of 50 DEG C or above to obtain a raw material dispersion liquid; (2) stripping and grinding the raw material dispersion liquid obtained in the step (1) through mechanical pretreatment to obtain a pretreated product; and (3) carrying out high-pressure homogenization on the pretreated product obtained in the step (2) by using a high-pressure homogenizer to obtain a dispersion liquid of the micro-nano lignocelluloses; and optionally, removing the solvent of the dispersion of micro-nano lignocellulose to obtain micro-nano lignocellulose. The lignin-containing cellulose raw materialcan be directly stripped to obtain the micro-nano lignocellulose, the hydrophilic and oleophylic properties of the nano cellulose are improved due to the existence of the lignin, and the micro-nano lignin cellulose is endowed with compatibility with other materials, especially compatibility with hydrophobic materials.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer materials, and in particular 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 m...

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] CN101949103A discloses a method for preparing micro-nano cellulose, which is directly prepared by plant stalks, but still uses a delignification agent for delignification treatment; CN103194027A discloses a nano-cellulose / lignin light-blocking film The preparation method obtains nano-cellulose materials with high lignin content, but in the preparation process, it is necessary to remove and extract lignin and then perform cellulose nano-processing, and then mix lignin and nano-cellulose, and the preparation process is cumbersome and complicated; CN104693464A discloses A method for preparing lignocellulose-reinforced polylactic acid composite membranes, which uses sulfuric acid hydrolysis-high-pressure homogenization method to prepare lignocellulose nanocellulose. Sulfuric acid is used in this process, which has a great impact on the environment

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