Lignin nanoparticles as well as preparation method and application thereof

A nanoparticle and lignin technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of environmental harm and consumption, and achieve the effect of low cost, cost reduction and small size

Active Publication Date: 2021-05-28
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the experiment requires the use of environmentally harmful chemicals such as acetyl bromide
In addition, in the prior art, in order to obtain a high-concentration nanoparticle dispersion, it also needs to consume energy to evaporate a large amount of water

Method used

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  • Lignin nanoparticles as well as preparation method and application thereof
  • Lignin nanoparticles as well as preparation method and application thereof
  • Lignin nanoparticles as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Such as figure 1 As shown, the present embodiment provides a method for preparing lignin nanoparticles, comprising the following steps:

[0060] Step A, using dragon bamboo biomass (with a lignin content of 22.8wt%) as raw material, air-dried, crushed, and sieved to obtain 40-60 mesh powder, dried in an oven at 60°C for 24 hours for later use, with a moisture content of 8% -12%.

[0061] Step B, mix choline chloride and p-hydroxybenzoic acid at a molar ratio of 3:2, heat in an oil bath at 100°C for 2 hours to obtain a homogeneous and transparent liquid, and store it for future use.

[0062] Step C, mix 4.0g dragon bamboo raw material with 40g choline chloride: p-hydroxybenzoic acid deep eutectic solvent, react the obtained solid-liquid mixture at 120°C for 6h, add 200mL acetone aqueous solution after the reaction is completed, and obtain pretreatment Mixture; the volume ratio of acetone to water in the acetone aqueous solution is 1:1.

[0063] Step D, use vacuum filt...

Embodiment 2

[0069] Such as figure 1 As shown, the present embodiment provides a method for preparing lignin nanoparticles, comprising the following steps:

[0070] Step A, using dragon bamboo biomass (with a lignin content of 22.8wt%) as raw material, air-drying, crushing, and sieving to obtain 40-60 mesh powder, drying in an oven at 60°C for 24 hours for later use, with a moisture content of 8%- 12%.

[0071] Step B, mix choline chloride and p-hydroxybenzoic acid at a molar ratio of 3:2, heat in an oil bath at 100°C for 2 hours to obtain a homogeneous and transparent liquid, and store it for future use.

[0072] Step C, mix 4.0g dragon bamboo raw material with 40g choline chloride: p-hydroxybenzoic acid deep eutectic solvent, react the obtained solid-liquid mixture at 140°C for 4h, add 200mL acetone aqueous solution after the reaction is completed, to obtain pretreatment mixture. The volume ratio of acetone to water in the acetone aqueous solution is 1:1.

[0073] Step D, use vacuum ...

Embodiment 3

[0079] Such as figure 1 As shown, the present embodiment provides a method for preparing lignin nanoparticles, comprising the following steps:

[0080] Step A, using dragon bamboo biomass (with a lignin content of 22.8wt%) as raw material, air-drying, crushing, and sieving to obtain 40-60 mesh powder, drying in an oven at 60°C for 24 hours for later use, with a moisture content of 8%- 12%.

[0081] Step B, mix choline chloride and p-hydroxybenzoic acid at a molar ratio of 3:2, heat in an oil bath at 100°C for 2 hours to obtain a homogeneous and transparent liquid, and store it for future use.

[0082] Step C, mix 4.0g dragon bamboo raw material with 40g choline chloride: p-hydroxybenzoic acid deep eutectic solvent, react the obtained solid-liquid mixture at 160°C for 3h, add 200mL acetone aqueous solution after the reaction is completed, and obtain pretreatment mixture. The volume ratio of acetone to water in the acetone aqueous solution is 1:1.

[0083] Step D, use vacuum...

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Abstract

The invention relates to lignin nanoparticles and a preparation method and an application thereof, the method comprises the following steps: mixing a hydrogen bond acceptor and a hydrogen bond donor, heating to obtain a homogeneous transparent eutectic solvent, and cooling to room temperature; uniformly mixing a lignocellulose raw material with a deep-eutectic solvent to form a solid-liquid mixture; carrying out heat treatment on the solid-liquid mixture to obtain a pretreated mixture; cooling and washing the pretreated mixture, then carrying out solid-liquid separation to obtain solid-phase pretreated cellulose residues and a liquid-phase component, drying the solid-phase pretreated cellulose residues, and collecting the dried solid-phase pretreated cellulose residues; evaporating and concentrating the liquid component, adding the liquid component into a reversed-phase solvent to precipitate lignin nanoparticles, centrifuging, drying and collecting; and step E, recovering the eutectic solvent in the centrifugate for recycling. The lignin nanoparticles have antioxidant activity comparable with that of a commercial antioxidant dibutylated hydroxytoluene, and have wide application prospects in the industries of food packaging materials, skin care medicine and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of natural polymer materials, and in particular relates to a lignin nanoparticle and its preparation method and application. Background technique [0002] Due to the excessive consumption of non-renewable petrochemical resources, energy and environmental problems are becoming more and more severe, and the development of bio-based materials, energy and chemicals that use renewable lignocellulosic biomass as raw materials has become a hot spot for scholars. Lignin is the most abundant renewable organic aromatic polymer compound in nature, its yield is second only to cellulose, and it widely exists in plant fiber raw materials. More than 70 million tons of lignin is separated as a by-product of the biomass energy industry every year, of which 95% of industrial lignin is burned, and only 5% is used to produce value-added chemicals. The difficulties and challenges in the research a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08L97/00B82Y30/00B82Y40/00A61K8/72A61Q19/08
CPCA61K8/72A61K2800/413A61K2800/522A61Q19/08B82Y30/00B82Y40/00C08J3/14C08J2397/00C08L97/005
Inventor 肖领平孙润仓李文欣李晓莹肖文哲郭延柱陈小红
Owner DALIAN POLYTECHNIC UNIVERSITY
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