Nanocellulose-based airgel based on electrostatic adsorption and chemical crosslinking enhancement and its preparation method

A technology of nanocellulose and chemical cross-linking, which is applied in the field of nanocellulose-based airgel and its preparation, can solve problems such as poor compatibility, easy aggregation of inorganic nanoparticles, and destruction of the airgel skeleton structure, and achieve improved stability Sexuality, low price, great potential for industrialization

Active Publication Date: 2021-10-08
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Airgel physical modification method is mainly to introduce different inorganic nanoparticles (such as graphite or graphene, CN108579626A) in the nanocellulose airgel skeleton, there are following problems in this modification mode: on the one hand these inorganic nanoparticles and The compatibility between the organic framework of nanocellulose is poor, and it cannot achieve a good modification and reinforcement effect; on the other hand, inorganic nanoparticles are easy to agglomerate, resulting in the destruction of the skeleton structure of the airgel
CN109180993A discloses a preparation method of fluorescent nanocellulose airgel material, which has no significant improvement in mechanical properties

Method used

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  • Nanocellulose-based airgel based on electrostatic adsorption and chemical crosslinking enhancement and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] At room temperature, 25 g of cationized cellulose nanocrystal suspension (1% by mass fraction), 75 g of cellulose nanocrystal microfibril suspension (1% by mass fraction), and 0.6 g of sodium alginate solid were mixed, and the resulting mixture was strongly mechanically After stirring for 3 hours, a well mixed suspension was obtained. The suspension was dried for 48 hours by freeze drying or supercritical carbon dioxide drying to obtain 1.6 g of composite airgel.

[0029] Weigh 4g HT, 0.12g trimethylamine, and 50g acetone to prepare a cross-linking solution, immerse 1.6g composite airgel in the cross-linking solution and react at 30°C for 48 hours, then wash repeatedly with acetone solution to remove the aerogel The unreacted cross-linking reagent on the surface is finally freeze-dried or supercritical carbon dioxide dried to obtain the target composite airgel product.

Embodiment 2

[0031] This example is basically the same as Example 1, except that the dosages of the cellulose nanocrystal suspension and the cellulose nanofiber suspension are changed from 25g and 75g to 50g and 50g respectively.

Embodiment 3

[0033] This example is basically the same as Example 1, except that the dosages of the cellulose nanocrystal suspension and the cellulose nanofiber suspension are changed from 25g and 75g to 75g and 25g respectively.

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Abstract

The invention relates to a nanocellulose-based aerogel based on electrostatic adsorption synergistic chemical crosslinking enhancement and a preparation method thereof. Firstly, cellulose nanocrystals and cellulose nanofibrils were extracted from biomass waste; then cellulose nanocrystals and cellulose nanofibrils were treated with 2,3-epoxypropyltrimethylammonium chloride and TMPEO, respectively. Modification treatment, so that the surface is respectively charged with sufficient positive and negative charges; then the modified cellulose nanocrystals, cellulose nanofibrils and sodium alginate with different charges are mixed to obtain a composite airgel; finally Chemical crosslinking of isocyanate compounds such as HT is sufficient. Under the combined effects of electrostatic adsorption, chemical cross-linking, and cellulose nanocrystal reinforcement, the composite airgel exhibits excellent mechanical properties, and its compressive modulus and compressive strength are three times higher than those of traditional nanocellulose-based aerogels. An order of magnitude, the problems of brittleness and disintegration have been completely solved.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a nanocellulose-based aerogel based on electrostatic adsorption and synergistic chemical crosslinking enhancement and a preparation method thereof. Background technique [0002] Airgel is one of the lowest density solid materials in the world. During the preparation of airgel, the liquid in the gel is generally removed by freeze-drying or supercritical carbon dioxide drying, while retaining the complete molecular network skeleton structure of the gel. In addition to the inherent advantages of ultra-low density and ultra-high specific surface area, different functional aerogels also have good antibacterial properties, heat resistance, high reactivity, and super adsorption capacity. Due to these excellent properties, aerogels have been widely used in various fields. [0003] Organic nanocellulose is a renewable, biocompatible, biodegradable, non-toxic biopolymer material, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/04C08L5/04C08J9/28C08J9/36
CPCC08J9/0061C08J9/28C08J9/36C08J2205/026C08J2301/04C08J2401/04C08J2405/04
Inventor 林宁陶晗
Owner WUHAN UNIV OF TECH
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