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Preparation method of micro-nano lignocellulose composite material, composite material and application

A technology of lignocellulose and composite materials, which is applied in the field of preparation of micro-nano lignocellulose composite materials, can solve the problems of limiting the high-value utilization of lignocellulose, cumbersome grafting modification steps, and low reaction efficiency, and achieves good results. The effects of organic solvent dispersibility, easy operation of the method, and broad application prospects

Active Publication Date: 2021-07-20
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Chinese patent CN111825845A introduces a method of grafting polylactic acid onto wood fibers by adding an initiator and click chemistry under N,N-dimethylacetamide solvent, but the reaction process is all under harmful organic solvents carry out, there is greater pressure on the environment
However, the modification of micro-nano lignocellulose is usually carried out in the presence of organic solvents. The grafting modification steps are cumbersome and the reaction efficiency is low, which limits the high-value utilization of lignocellulose.

Method used

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  • Preparation method of micro-nano lignocellulose composite material, composite material and application
  • Preparation method of micro-nano lignocellulose composite material, composite material and application
  • Preparation method of micro-nano lignocellulose composite material, composite material and application

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preparation example Construction

[0038] Now in conjunction with accompanying drawing and specific embodiment the present invention is further described, as figure 1 As shown, according to the preparation method of the micro-nano lignocellulose composite material of the embodiment of the present invention, the method comprises the following steps:

[0039] S1, adding lignocellulose into a deep eutectic solvent for heating and swelling treatment, and then mechanically treating to obtain a micro-nano lignocellulose dispersion;

[0040] S2. Adding a catalyst to the micro-nano lignocellulose dispersion liquid, and preparing a micro-nano lignocellulose composite material containing self-polymer and graft polymerization-modified micro-nano lignocellulose through heating reaction.

[0041] In one embodiment, a polymerizable monomer is added to the micro-nano lignocellulose dispersion before the heating reaction.

[0042]In one embodiment, the polymerizable monomer includes but is not limited to at least one of acryl...

Embodiment 1

[0057] Take 3g of absolute dry cellulose, the lignin content is 0%, and it is decomposed into cotton flocs through a decomposer; the decomposed cellulose and lactic acid / choline chloride deep eutectic solvent are at a solid-to-liquid ratio of 1:8 (g / mL) were mixed evenly, heated and swelled in an oil bath at 100°C for 3 hours; the swollen cellulose was ground in a colloid mill for 40 minutes to obtain a micro-nanocellulose deep eutectic solvent dispersion with a diameter of 5nm- 40nm; Slowly add 2.5wt% stannous octoate catalyst relative to the mass of lactic acid to the dispersion, heat the dispersion in an oil bath at 100°C for 8 hours and stir mechanically to obtain a deep eutectic solvent autopolymer and graft polymerization modification Micro-nano cellulose mixture dispersion, the obtained mixture dispersion of deep eutectic solvent self-polymer and graft polymerization modified micro-nano cellulose can be processed into a composite material through a 3D printing process. ...

Embodiment 2

[0059] Get 3g of absolute dry lignocellulose, lignin content is 5.76%, decompose to cotton-wool shape through decomposer; The lignocellulose after decompression and lactic acid / choline chloride deep eutectic solvent are 1:10 ( g / mL) were mixed evenly, heated and swelled in an oil bath at 90°C for 1 h; the swollen lignocellulose was ground in a colloid mill for 40 min to obtain micro-nano lignocellulose deep eutectic solvent dispersion, micro-nano lignocellulose The diameter of the element is 5nm-40nm; slowly add 2.5wt% stannous octoate catalyst relative to the mass of lactic acid to the dispersion, heat the dispersion in an oil bath at 110°C for 12h and mechanically stir to obtain a deep eutectic solvent autopolymer and Graft polymerization modified micro-nano lignocellulose mixture dispersion, the prepared deep eutectic solvent autopolymer and graft polymerization modified micro-nano lignocellulose mixture dispersion can be processed into composite materials through injection ...

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Abstract

The invention discloses a preparation method of a micro-nano lignocellulose composite material, the composite material and application, the method comprises the following steps: S1, adding lignocellulose into a deep eutectic solvent for heating swelling treatment, and then carrying out mechanical treatment to obtain a micro-nano lignocellulose dispersion liquid; s2, adding a catalyst into the micro-nano lignocellulose dispersion liquid, and carrying out a heating reaction to prepare the micro-nano lignocellulose composite material containing the self-polymer and the graft polymerization modified micro-nano lignocellulose at the same time. The method has the beneficial effects that the micro-nano lignocellulose and the micro-nano lignocellulose composite material are efficiently prepared by a one-pot method under the eutectic solvent system; the method has the remarkable characteristics of environment-friendly and green preparation process, low solvent cost and the like, and also has the advantages of mild reaction conditions, high operability, no chemical pollution and the like; the prepared micro-nano lignocellulose composite material can be widely applied to the fields of engineering materials, packaging materials, biomedical materials and the like.

Description

technical field [0001] The invention relates to the field of graft polymerization modification of lignocellulose on the micro-nano scale, in particular to a preparation method, composite material and application of micro-nano lignocellulose composite materials. Background technique [0002] Lignocellulose is the most abundant renewable biomass resource on land, widely exists in various plant fiber raw materials, and is an important structure in plant cell walls. The traditional utilization methods of lignocellulose, such as the paper industry, usually have low added value, which is not conducive to the efficient utilization of lignocellulose. Lignocellulose can be chemically modified to give it different properties, thereby increasing its added value. Modified lignocellulose has been widely used in various fields, such as biofuels, hydrogels, 3D printing materials, nanocomposites materials etc. [0003] Graft copolymerization modification can improve the disadvantages of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H8/00C08F289/00C08F222/06C08F220/06C08F220/56C08F220/10C08F218/08C08F220/44C08F232/08C08F212/08
CPCC08H8/00C08F289/00C08F222/06C08F220/06C08F220/56C08F220/10C08F218/08C08F220/44C08F232/08C08F212/08
Inventor 王志国马若腾张莉莉范一民
Owner NANJING FORESTRY UNIV
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