Lignin/surfactant composite nanoparticle and preparation method thereof

Abstract

The invention belongs to the technical field of nanomaterials and discloses a lignin/surfactant composite nanoparticle and a preparation method thereof. The preparation method comprises the followingsteps: (1) dispersing 100 parts by mass of lignin into alkaline liquid, adjusting the pH value of the system to 9-12, adding 10-25 parts by mass of epoxy chloropropane, carrying out cross-linking reaction at 80-95 DEG C for 1-3 hours, so as to obtain high molecular weight lignin; (2) adding high molecular weight lignin, alkali and a surfactant into water, so as to obtain a mixed solution with thepH value of 9-12; and (3) adding acid into the mixed solution until the pH value of the mixed solution is 4-6, and stirring, so as to obtain a water dispersion solution of the lignin/surfactant composite nanoparticle. The lignin/surfactant composite nanoparticle prepared by virtue of the preparation method has excellent water dispersion performance, the hydrodynamic radius is 40nm-500nm, and the lignin/surfactant composite nanoparticle can be very stably dispersed into water and can be easily mixed with other components.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a lignin / surfactant composite nanoparticle well dispersed in water and a preparation method thereof. Background technique [0002] Nanoparticles are very valuable materials. At present, most of the nanoparticles are prepared from inorganic materials. Inorganic nanoparticles, especially those made of metal or mineral materials, can exist in the environment stably for a long time. to sustained damage. Moreover, since most inorganic materials are not biocompatible and biodegradable, which limits their applications in many fields, only a few kinds of inorganic nanoparticles can be used in food, medicine, and cosmetics. Biomass materials have advantages that traditional inorganic materials do not have, such as renewability, biocompatibility, and biodegradability. [0003] Lignin is the second most abundant natural macromolecular chemical after cellulose and the most abun...

AI Technical Summary

Problems solved by technology

The large amount of organic solvent used in the solvent method is likely to bring potential environmental hazards, and due to the residue of harmful organic solvents, the application of the prepared lignin nanoparticles will also be limited

The physical methods for preparing lignin nanoparticles mainly include high-pressure shearing method, spray drying method, and ultrasonic method. Compared with solvent methods, the dependence on chemical reagents can be greatly reduced, and the prepared lignin particles have low toxicity. However, these methods generally have the disadvantages of strict operating conditions and high energy consumption, and the prepared lignin nanoparticles are easy to agglomerate and have poor water dispersion performance.

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