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Nano cellulose based biological aerogel and preparation method and application thereof

A technology of nanocellulose and nanoscale cellulose, applied in chemical instruments and methods, colloid chemistry, colloid chemistry, etc., can solve the problems of easy re-dispersion, etc., and achieve the effect of strong practicability, high surface area and simple process

Inactive Publication Date: 2016-07-13
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the shape stability of nanocellulose-based bioaerogels. Among them, WeiZhang, YaanZhang, CanhuiLu, and YulinDeng disclosed an airgel formed by crosslinking nano / micro fibers in J.Mater.Chem. , the airgel solves the problem of easy redispersion of nanocellulose-based bioaerogels in water through polyamide epichlorohydrin wet strength agent (PAE), but since the paper uses polyamide epichlorohydrin wet strength agent Enhancer (PAE), is not a biocompatible substance, and requires a cross-linking reaction at a temperature above 100 ° C, and a fully biocompatible technology that can stabilize the shape of nanocellulose-based bioaerogels in water has not yet been developed. report

Method used

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  • Nano cellulose based biological aerogel and preparation method and application thereof
  • Nano cellulose based biological aerogel and preparation method and application thereof
  • Nano cellulose based biological aerogel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of bioaerogel of the present invention comprises the following steps:

[0036] (1) Fully bleached softwood pulp adopts chemical mechanical method to prepare nanocellulose dispersion;

[0037] Nano-scale cellulose dispersion: In this example, a chemical-mechanical method is used to prepare a nano-scale cellulose dispersion, and the fiber is first subjected to an appropriate oxidative degradation pretreatment using a chemical degradation method. For example, sodium hydroxide solution can be used for pretreatment, and then A high-pressure homogenizer is used for homogenization treatment to obtain the nanocellulose dispersion in this example.

[0038] (2) Chitosan is prepared into a 1% solution with 2% acetic acid solution;

[0039] The preparation method of chitosan: use clean shrimp and crab shells as raw materials, decalcify them with hydrochloric acid, and then digest them with caustic soda to deproteinize them to obtain chitin, and then use conc...

Embodiment 2

[0046] The preparation method of bioaerogel of the present invention comprises the following steps:

[0047] (1) The fully bleached broadleaf pulp is prepared by mechanical method and chemical combination method; the preparation method is the same as in Example 1.

[0048] (2) chitosan is prepared into 1% solution with 0.01mol / L hydrochloric acid solution;

[0049] The preparation method of chitosan: use clean shrimp and crab shells as raw materials, decalcify them with hydrochloric acid, and then digest them with caustic soda to deproteinize them to obtain chitin, and then use concentrated lye to deacetylate chitin to obtain the final Chitosan, and chitosan is prepared into 1% solution with 0.01mol / L hydrochloric acid solution, obtains the chitosan solution of the present embodiment.

[0050] (3) The cellulose in the nanoscale cellulose dispersion prepared in (1) is mixed with the chitosan in the chitosan solution prepared in (2) with a ratio of 1:0.05, mechanically stirred ...

Embodiment 3

[0055]The preparation method of bioaerogel of the present invention comprises the following steps:

[0056] (1) Unbleached broadleaf pulp adopts mechanical method to prepare micron cellulose dispersion;

[0057] In this embodiment, a high-pressure homogenizer is used to prepare a micron cellulose dispersion, that is, the reciprocating pump of the high-pressure homogenizer transports a certain concentration of fiber slurry to the working valve area, and the pressure drops rapidly. The strong cavitation effect similar to the explosion effect is generated in the narrow area composed of the former, and accompanied by the shearing action of the slurry passing through the slit between the valve core and the valve seat and the high-speed impact of the impact ring, the fiber Filaments are disintegrated and the fibers are miniaturized.

[0058] (2) Chitosan is prepared into 1% solution with 2% acetic acid solution (preparation method is identical with embodiment 1);

[0059] (3) The ...

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Abstract

The invention discloses nano cellulose based biological aerogel and a preparation method and an application thereof. The preparation method comprises the following steps: (1) taking plant cellulose pulp as a raw material, and preparing a nano / micron cellulose dispersion liquid by mechanical and chemical methods; (2) dissolving chitosan with an acid to prepare a solution; (3) mixing the nano / micron cellulose dispersion liquid of the step (1) and the solution of the step (2) with the mixed ratio of chitosan to nano cellulose of 1 to (0-0.4), and stirring; (4) carrying out centrifugal dehydration to form hydrogel; (5) carrying out freeze drying of the hydrogel of the step (4) to obtain the aerogel finished product. The aerogel preparation method has the advantages of simpleness, high practicality, and easy realization of industrialized production; and besides, the prepared biological aerogel is supported with nanoparticles, the particles are fine and are uniformly dispersed, and no particle agglomerating and caking phenomenon happens. The biological aerogel prepared by the method is completely biocompatible, has stable shape, is not easy to disperse, and is an excellent carrier for nanoparticles.

Description

technical field [0001] The invention relates to the technical field of nanocellulose application, in particular to a nanocellulose-based bioaerogel and its preparation method and application. Background technique [0002] Airgel is a highly porous material formed by removing the liquid solvent in the gel while maintaining the three-dimensional network structure of the gel. A large number of nano-sized open pore structures in the airgel endow the material with ultra-high porosity, high specific surface area, ultra-low density and other characteristics, making it have broad application prospects in many fields such as optics, electricity, acoustics, thermal and catalysis. . [0003] Nanocellulose is a cellulose with a diameter of nanometers obtained by silking plant cellulose. Due to the obvious advantages of rich raw materials, biocompatibility, and natural degradability, it has been widely studied. As a medical biomaterial, it is one of its main application fields. . Bioa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/09C08L1/02C08L5/08B01J13/00
Inventor 颜进华
Owner GUANGDONG IND TECHN COLLEGE
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