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Holocellulos composite aerogel and preparation method thereof

A composite airgel and whole cellulose technology, which is applied in the field of full cellulose composite airgel and its preparation, can solve the problems of high density, easy shrinkage, and low specific surface area of ​​cellulose-based airgel, and achieve wide application Foreground, stable properties, effect of huge specific surface area

Active Publication Date: 2019-12-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high density, low specific surface area and easy shrinkage in the preparation process of existing cellulose-based aerogels, and to provide a full cellulose composite aerogel and its preparation method

Method used

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  • Holocellulos composite aerogel and preparation method thereof
  • Holocellulos composite aerogel and preparation method thereof
  • Holocellulos composite aerogel and preparation method thereof

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Experimental program
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Embodiment 1

[0026] The preparation of embodiment 1 full cellulose composite airgel:

[0027] (1) Pour the ionic liquid into a round-bottomed flask, spin-evaporate at 60°C for 1 hour, put it in a vacuum drying oven, and dry it at 85°C for 1 day.

[0028] (2) Crush the cellulose with a pulverizer and pass it through a 200-mesh sieve to obtain cellulose raw material powder. The cellulose nanofibril water suspension is centrifuged, the water in the upper layer is removed, washed with dimethyl sulfoxide, and the obtained cellulose nanofibril is dispersed in dimethyl sulfoxide for subsequent use (cellulose nanofibril and di The mass ratio of methyl sulfoxide is 1:2).

[0029] (3) add 3wt% vacuum-dried cellulose powder in ionic liquid 1-allyl-3-methylimidazolium chloride, add dimethyl sulfoxide (the mass ratio of dimethyl sulfoxide and ionic liquid 1 :4), the oil bath was heated to 105° C. and magnetically stirred until the cellulose was completely dissolved.

[0030] (4) The solvent system t...

Embodiment 2

[0032] The preparation of embodiment 2 full cellulose composite airgel:

[0033] (1) Pour the ionic liquid into a round-bottomed flask, spin-evaporate at 60°C for 1 hour, put it in a vacuum drying oven, and dry it at 85°C for 1 day.

[0034] (2) Crush the cellulose with a pulverizer and pass it through a 200-mesh sieve to obtain cellulose raw material powder. The cellulose nanofibril water suspension is centrifuged, the water in the upper layer is removed, washed with dimethyl sulfoxide, and the obtained cellulose nanofibril is dispersed in dimethyl sulfoxide for subsequent use (cellulose nanofibril and di The mass ratio of methyl sulfoxide is 1:2).

[0035] (3) add 3wt% vacuum-dried cellulose powder in ionic liquid 1-butyl-3-methylimidazolium chloride, add dimethyl sulfoxide simultaneously (the mass ratio of dimethyl sulfoxide and ionic liquid is 1: 4), the oil bath was heated to 105°C and magnetically stirred until the cellulose was completely dissolved.

[0036] (4) The ...

Embodiment 3

[0038] The preparation of embodiment 3 full cellulose composite airgel:

[0039] (1) Pour the ionic liquid into a round-bottomed flask, spin-evaporate at 60°C for 1 hour, put it in a vacuum drying oven, and dry it at 85°C for 1 day.

[0040] (2) Crush the cellulose with a pulverizer and pass it through a 200-mesh sieve to obtain cellulose raw material powder. Centrifuge the aqueous suspension of cellulose nanofibrils, remove the water in the upper layer, wash with N,N-dimethylformamide, and disperse the obtained cellulose nanofibrils in N,N-dimethylformamide for later use (The mass ratio of cellulose nanofibrils to N,N-dimethylformamide is 1:5).

[0041](3) Add 3wt% vacuum-dried cellulose powder to the ionic liquid 1-allyl-3-methylimidazolium chloride, and simultaneously add N,N-dimethylformamide (N,N-dimethylformamide The mass ratio of amide to ionic liquid is 1:4), the oil bath is heated to 105°C and magnetically stirred until the cellulose is completely dissolved.

[004...

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Abstract

The invention discloses holocellulos composite aerogel and a preparation method thereof. Cellulose nano fibrils is added as a reinforcing phase in a conventional regenerated fiber aerogel preparationprocess, so that the problems that regenerated cellulose aerogel is high in density, low in specific surface area and liable to shrink in the preparation process can be solved. The preparation methodcomprises the following steps: firstly, dissolving cellulose by using a mixed system of an ionic liquid and a cosolvent; adding a cellulose nano fibrils / cosolvent suspension into the mixed system, performing uniform stirring, pouring the mixed system into a mold, further adding a regeneration solvent to form gel, performing washing by using the regeneration solvent so as to remove the ionic liquid, performing solvent exchange, and performing freeze drying or supercritical carbon dioxide, so as to obtain the aerogel. The holocellulos composite aerogel disclosed by the invention has a large specific surface area, good hydrophilcity, biocompatibility and biodegradability and stable chemical properties, and has wide application prospects in multiple fields such as biological medical materialssuch as wound repairing, antibacterial sterilization, cell culture, tissue engineering and medicine carriers.

Description

technical field [0001] The invention belongs to the technical field of cellulose-based airgel preparation, in particular to an all-cellulose composite airgel and a preparation method thereof. Background technique [0002] With increasing environmental concerns and dwindling petroleum resources, the development of biodegradable materials from natural resources as an alternative to petroleum-based polymers has attracted great interest. As the most abundant biopolymer on earth, cellulose is biodegradable, renewable and recyclable, which can meet the growing demand for environmentally friendly and biocompatible products. Natural cellulose is a macromolecular polysaccharide composed of D-glucose with β-1,4 glycosidic bonds. It stacks in parallel cellulose chains and forms cellulose I with a highly ordered structure. In the direction parallel to the chain axis, the fiber The elastic modulus of prime I can reach 138Gpa, with excellent mechanical properties, it is an ideal reinforc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/09C08L1/02
CPCC08J9/28C08J3/096C08J3/097C08J2205/026C08J2301/02C08J2401/02C08J2201/0482C08J2201/0484Y02P20/54
Inventor 王利军唐智光翁梦苓姜言
Owner GUANGXI UNIV
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