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Structurally ordered chitosan/nanocellulose composite aerogel and preparation method thereof

A nanocellulose and composite aerogel technology, applied in aerogel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of poor mechanical properties, brittleness of aerogels, etc. The effect of excellent thermal properties, excellent mechanical and thermal insulation properties

Active Publication Date: 2020-05-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the technical deficiencies of existing airgel such as brittle fracture, poor mechanical properties, anisotropy, etc., to develop an airgel material with orderly structure, excellent mechanical properties and thermal insulation properties

Method used

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  • Structurally ordered chitosan/nanocellulose composite aerogel and preparation method thereof
  • Structurally ordered chitosan/nanocellulose composite aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 2g chitosan powder is dissolved in concentration and is 2% acetic acid solution, in the oil bath of 60 ℃, magnetic force stirs 60min, obtains the chitosan solution that concentration is 2%; The dialdehyde solution was aged for 20 hours to obtain chitosan hydrogel, which was washed with distilled water to neutrality; the hydrogel was oriented frozen in liquid nitrogen at a freezing rate of 10mm / min, and then the completely frozen solidified block was frozen at -50 ℃ freeze-drying for 48 hours to obtain long-range ordered chitosan airgel;

[0028] (2) Place the chitosan airgel in (1) in a nanocellulose dispersion with a concentration of 0.5%, freeze in a refrigerator for 24 hours, and freeze-dry at -50°C for 24 hours to obtain a shell with an ordered structure Polysaccharide / nanocellulose airgel.

Embodiment 2

[0030] (1) 1g chitosan powder is dissolved in the concentration of 2% acetic acid solution, in the oil bath of 60 ℃, magnetically stirred for 60min to obtain a concentration of chitosan solution of 1%; The dialdehyde solution was aged for 12 hours to obtain chitosan hydrogel, which was washed with distilled water until neutral; the hydrogel was oriented frozen in liquid nitrogen at a freezing rate of 5mm / min, and then the completely frozen solidified block was frozen at -50 ℃ freeze-drying for 48 hours to obtain long-range ordered chitosan airgel;

[0031] (2) Place the chitosan airgel in (1) in a nanocellulose dispersion with a concentration of 0.8%, freeze in a refrigerator for 24 hours, and freeze-dry at -50°C for 24 hours to obtain a shell with an ordered structure Polysaccharide / nanocellulose airgel.

Embodiment 3

[0033] (1) 1.5g chitosan powder is dissolved in concentration and is the acetic acid solution of 1.5%, in the oil bath of 60 ℃, magnetic force stirs 60min, obtains the chitosan solution that concentration is 2%; Add concentration is 1% Glutaraldehyde solution was aged for 24h to obtain chitosan hydrogel, which was washed with distilled water to neutrality; the hydrogel was oriented frozen in liquid nitrogen at a freezing rate of 10mm / min, and then the completely frozen solidified block was placed in- Freeze-drying at 50°C for 48 hours to obtain long-range ordered chitosan airgel;

[0034] (2) Place the chitosan airgel in (1) in a nanocellulose dispersion with a concentration of 1%, freeze in a refrigerator for 24 hours, and freeze-dry at -50°C for 24 hours to obtain a shell with an ordered structure Polysaccharide / nanocellulose airgel.

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Abstract

The invention discloses a structurally ordered chitosan / nanocellulose composite aerogel and a preparation method thereof. The preparation method comprises the following steps of: mixing a chitosan solution with a cross-linking agent, heating to form hydrogel, and carrying out oriented freezing on the chitosan hydrogel until the chitosan hydrogel is completely solid, then, performing drying to obtain chitosan aerogel, and soaking the chitosan aerogel in the nano-cellulose dispersion liquid, and carrying out freeze drying to obtain the chitosan / nano-cellulose composite aerogel constructed by a long-range ordered structure and a honeycomb structure. The chitosan / nanocellulose composite aerogel has an ordered structure combining long-range ordering and a honeycomb network, has the properties of small density, low thermal conductivity, excellent compression resilience and the like, belongs to the field of aerogel material preparation, and can be applied to the fields of thermal insulation,tissue engineering and the like.

Description

technical field [0001] The invention relates to a structurally ordered chitosan / nanocellulose composite airgel and a preparation method thereof, belonging to the technical field of new materials. Background technique [0002] Nanocellulose not only has the basic structure and excellent properties of cellulose, but also has the characteristics of nanoparticles such as large specific surface area, high degree of polymerization, high crystallinity, high Young's modulus, high strength, high reactivity and high strength. . Nanocellulose airgel prepared from nanocellulose has the characteristics of low density, high porosity, and high specific surface area. However, most single-component nanocellulose fiber airgel materials have poor mechanical properties, so The practical application of airgel materials is largely limited. [0003] Chitosan, as a renewable bio-alkaline polysaccharide polymer, is second only to cellulose in natural reserves. It is obtained by deacetylation of ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 刘丽芳张美玲降帅李萌萌王妮
Owner DONGHUA UNIV
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