A kind of dialdehyde nanocellulose three-dimensional flexible material and its preparation method and application

A nanocellulose, three-dimensional technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., to achieve the effect of rich aldehyde group content, good compressibility and high stress retention rate

Active Publication Date: 2022-07-15
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies and reports on the direct preparation of pure nanocellulose gel materials with good water resistance and compression resilience by using low-concentration nanocellulose solutions.

Method used

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  • A kind of dialdehyde nanocellulose three-dimensional flexible material and its preparation method and application
  • A kind of dialdehyde nanocellulose three-dimensional flexible material and its preparation method and application
  • A kind of dialdehyde nanocellulose three-dimensional flexible material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) A cellulose nanofiber (CNF, Beijing North Tianchen Technology Co., Ltd., model: TC-UCN-001) aqueous dispersion with a concentration of 0.6 wt% was prepared. In the beaker, add sodium periodate (NaIO) with a mass of 1.5 g 4 ) and 50 mL of CNF aqueous dispersion, adjust the pH to 4 with 1% hydrochloric acid, stir for 10 minutes and mix well, and then ultrasonically disperse for 20 minutes. Then, the sol was placed in a water bath shaker in the dark, the reaction temperature was 40°C, and the reaction time was 5 hours. After the reaction, the initial hydrogel was repeatedly soaked in deionized water, and finally treated with liquid nitrogen, and dried in a freeze dryer for 48 hours to obtain an aerogel product.

[0054] (2) The obtained aerogel product was soaked in deionized water, repeatedly squeezed and washed with water to remove the reaction by-products remaining in the interior to obtain a dialdehyde nanocellulose hydrogel. The infrared spectrum is shown in im...

Embodiment 2

[0058] (1) The aqueous dispersion of cellulose nanofibers (CNF, Beijing North Tianchen Technology Co., Ltd., model: TC-UCN-001) with a concentration of 0.6 wt% was prepared, and sodium periodate (1.0 g) was added to the beaker. NaIO 4 ) and 50 mL of CNF aqueous dispersion, adjust the pH to 4 with 1% hydrochloric acid, stir for 10 minutes and mix well, and then ultrasonically disperse for 20 minutes. Then, the sol was placed in a water bath shaker in the dark, the reaction temperature was 40°C, and the reaction time was 10 hours. After the reaction, the initial hydrogel was repeatedly soaked in deionized water, and finally treated with liquid nitrogen, and dried in a freeze dryer for 48 hours to obtain an aerogel product.

[0059] (2) The obtained aerogel product is soaked in deionized water, squeezed and washed repeatedly, and the reaction by-products remaining in the interior are removed to obtain a dialdehyde nanocellulose hydrogel.

[0060] (3) The dialdehyde nanocellulos...

Embodiment 3

[0063] (1) A cellulose nanofiber (CNF, Beijing North Tianchen Technology Co., Ltd., model: TC-UCN-001) aqueous dispersion with a concentration of 1.0 wt% was prepared, and sodium periodate (3.0 g) was added to the beaker. NaIO 4 ) and 50 mL of CNF aqueous dispersion, adjust the pH to 4 with 1% hydrochloric acid, stir for 10 minutes and mix well, and then ultrasonically disperse for 20 minutes. Then, the sol was placed in a water bath shaker in the dark, the reaction temperature was 40°C, and the reaction time was 24 hours. After the reaction, the initial hydrogel was repeatedly soaked in deionized water, and finally treated with liquid nitrogen, and dried in a freeze dryer for 24 hours to obtain an aerogel product.

[0064] (2) The obtained aerogel product is immersed in deionized water, and repeatedly squeezed and washed to remove the reaction by-products remaining in the interior to obtain the desired hydrogel product.

[0065] (3) The dialdehyde nanocellulose hydrogel has...

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Abstract

The invention discloses a dialdehyde nanocellulose three-dimensional material and a preparation method and application thereof. The preparation method of the dialdehyde nanocellulose three-dimensional material of the present invention includes the following steps: (1) High oxidation of the matrix: mixing the nanocellulose dispersion with an oxidizing agent, adjusting the pH to an acidic value, mixing uniformly, and heating the reaction in the dark to obtain the initial hydrogel; (2) freeze-drying of the matrix: the initial hydrogel is washed with water, frozen in liquid nitrogen, freeze-dried in vacuum, and washed with water again to obtain a three-dimensional dialdehyde nanocellulose material. The material of the invention has a flexible network structure, has extremely high modification value, can still maintain its shape in a wet environment, has good compression resilience and water resistance; the surface also has abundant hydroxyl and aldehyde groups, which can be used as The active sites were further functionalized, and the obtained dialdehyde nanocellulose solid amine adsorbent could adsorb acid gases.

Description

technical field [0001] The invention relates to the technical field of nanocellulose derivatives, in particular to a three-dimensional flexible material of dialdehyde nanocellulose and a preparation method and application thereof. Background technique [0002] Cellulose is composed of linear chains of repeating β-d-glucopyranose units covalently linked by β-1,4 glycosidic bonds. It is the most widely distributed and abundant natural polymer in nature. It exists in plants and some bacteria. , algae, marine animals and fungi, and can also be obtained from unprocessed and processed waste containing lignocellulosic biomass. Functionalized cellulose products have high application value in the bioeconomy. However, cellulose is insoluble in most common solvents, making it difficult to design and assemble 3D functional materials from the bottom up. Nanocellulose having at least one nanoscale is formed from cellulose through mechanically and chemically induced deconstruction based o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J3/075C08L1/04B01J20/24B01J20/26B01J20/28B01J20/30
CPCC08J9/28C08J3/075B01J20/24B01J20/261B01J20/28047C08J2301/04C08J2205/026C08J2201/0484B01J2220/4825B01J2220/4812B01J2220/4806
Inventor 陈水挟邱显瑜
Owner SUN YAT SEN UNIV
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