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Lignin/surfactant composite nanoparticle and preparation method thereof

A technology of composite nanoparticles and surfactants, applied in the field of nanomaterials, can solve the problems of easy agglomeration of lignin nanoparticles, poor water dispersibility, environmental hazards, etc. sexual effect

Active Publication Date: 2018-11-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Lignin/surfactant composite nanoparticle and preparation method thereof
  • Lignin/surfactant composite nanoparticle and preparation method thereof
  • Lignin/surfactant composite nanoparticle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Take 100 parts by mass of acid-analyzed lignin powder from wood pulp black liquor and use sodium hydroxide to prepare an aqueous solution with a concentration of 20 wt% and a pH of 12, add 15 parts by mass of epichlorohydrin, and crosslink at 95°C After reacting for 2 hours, the reaction liquid was dried by rotary evaporation to obtain high molecular weight lignin.

[0038] (2) Take 1 mass part of the above-mentioned high molecular weight lignin and add it to 100 mass parts of water, add an appropriate amount of sodium hydroxide to adjust the pH of the solution to 9 to completely dissolve the lignin, add 0.4 mass part of sodium dodecylbenzenesulfonate, and continue stirring Sodium dodecylbenzenesulfonate was completely dissolved to obtain a mixed solution.

[0039] (3) Add hydrochloric acid dropwise to the above mixed solution until the pH of the solution is 4, and continuously stir to obtain a dispersion of lignin / sodium dodecylbenzenesulfonate composite nanopartic...

Embodiment 2

[0041](1) Take 100 parts by mass of enzymatic lignin and use ammonia water to prepare an aqueous solution with a concentration of 30wt% and a pH of 10, add 20 parts by mass of epichlorohydrin, conduct a crosslinking reaction at 90°C for 2 hours, and dry the reaction solution by rotary evaporation Finally, high molecular weight lignin is obtained.

[0042] (2) Take 0.5 parts by mass of the above-mentioned high molecular weight lignin and add it to 100 parts by mass of water, add an appropriate amount of ammonia water to adjust the pH of the solution to 12 to completely dissolve the lignin, add 0.5 parts by mass of sodium oleate and 0.5 parts by mass of dodecylbenzenesulfonate Sodium Oleate, continue stirring to completely dissolve Sodium Oleate and Sodium Dodecylbenzene Sulfonate to obtain a mixed solution.

[0043] (3) Add sulfuric acid dropwise to the above mixed solution until the pH of the solution is 6, and continuously stir to obtain a dispersion of lignin / sodium oleate-s...

Embodiment 3

[0045] (1) Get 100 mass parts of acid-analyzed lignin powder from bamboo pulp black liquor and use sodium hydroxide to prepare an aqueous solution with a concentration of 40wt% and a pH of 9, add 10 mass parts of epichlorohydrin, and crosslink at 95°C After reacting for 3 hours, the reaction solution was dried by rotary evaporation to obtain high molecular weight lignin.

[0046] (2) Take 5 parts by mass of the above-mentioned high molecular weight lignin and add it to 100 parts by mass of water, add an appropriate amount of sodium hydroxide to adjust the pH of the solution to 11 to completely dissolve the lignin, add 2 parts by mass of sodium oleate, and continue stirring to completely dissolve the sodium oleate Dissolved to obtain a mixed solution.

[0047] (3) Add sulfuric acid dropwise to the above mixed solution until the pH of the solution is 5, and continuously stir to obtain a dispersion of lignin / sodium oleate composite nanoparticles.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08J3/24C08L97/00
CPCC08J3/03C08J3/24C08J2397/00
Inventor 庞煜霞王盛文邱学青杨东杰楼宏铭易聪华
Owner SOUTH CHINA UNIV OF TECH
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