Preparation method of cellulose nanofiber biomass gel and aerogel

A nanofiber and cellulose technology, which is applied in the field of preparation of cellulose nanofiber biomass gel and aerogel, can solve the problems of complex preparation process, lack of research and reports, etc., and achieve low preparation cost, good shape, and low cost. cost effect

Inactive Publication Date: 2017-06-27
HEYE HEALTH TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art including the above-mentioned patented technology, the preparation process of cellulose nanofiber biomass gel is complex and lacks research and reports on the preparation of physical gel under low concentration (low concentration of cellulose nanofiber) conditions.

Method used

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  • Preparation method of cellulose nanofiber biomass gel and aerogel
  • Preparation method of cellulose nanofiber biomass gel and aerogel
  • Preparation method of cellulose nanofiber biomass gel and aerogel

Examples

Experimental program
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preparation example Construction

[0042] Preparation of Cellulose 1: Take the pulp and wash it to neutral with distilled water. Prepare a sodium chlorite solution with a mass fraction of 0.5%, and add the pulp into the sodium chlorite solution until the pulp is completely submerged. Add acetic acid solution to the sodium chlorite solution soaked in pulp to adjust the pH of the system to 3. Then the whole system was placed at 70°C for 2 hours, during which intermittent stirring was performed every 15-20 minutes. After completion, the pulp was washed with distilled water until neutral to obtain cellulose 1, which was stored in a refrigerator for later use.

[0043] Preparation of Cellulose 2: Take microcrystalline cellulose and wash it to neutral with distilled water. A sodium chlorite solution with a mass fraction of 0.2% was prepared, and microcrystalline cellulose was added into the sodium chlorite solution until the microcrystalline cellulose was completely submerged. Add acetic acid solution to the sodiu...

specific Embodiment 1

[0054] Preparation of cellulose nanofiber biomass gel 1: take 20mL of the cellulose nanofiber dispersion 1 and place it in a coagulation tank, and use a hydrochloric acid solution with a concentration of 5M to treat it in an acidic coagulation bath. Cellulose nanofiber biogels with high and low cellulose content1.

[0055] Preparation of cellulose nanofiber biomass airgel 1: freeze-dry the cellulose nanofiber biomass gel 1 to obtain cellulose nanofiber biomass airgel with good shape, high strength and low cellulose content Glue 1.

specific Embodiment 2

[0057] Preparation of cellulose nanofiber biomass gel 2: take 20mL of the cellulose nanofiber dispersion 2 and place it in a 50mL beaker, and pour 20mL of hydrochloric acid solution with a concentration of 7M into another 250mL beaker, and place the small beaker in the large Put the large beaker in the beaker and seal it with plastic wrap for acidic steam bath treatment, take out the small beaker after 6 hours of treatment, and prepare the cellulose nanofiber biomass gel 2 with good shape, high strength and low cellulose content.

[0058] Preparation of cellulose nanofiber biomass airgel 2: supercritically dry the cellulose nanofiber biomass gel 2 to obtain cellulose nanofiber biomass gas with good shape, high strength and low cellulose content gel2.

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Abstract

The invention relates to a preparation method of cellulose nanofiber biomass gel and airgel, comprising the following steps: (1) treating cellulose with a TEMPO / NaBr / NaClO oxidation system to prepare oxidized cellulose; (2) Mechanically treat oxidized cellulose in an aqueous solution or weakly alkaline aqueous solution to obtain a cellulose nanofiber dispersion; (3) process the cellulose nanofiber dispersion through an acidic coagulation bath or an acidic steam bath to obtain a raw cellulose nanofiber. (4) drying and dehydrating the cellulose nanofiber biomass gel to prepare the cellulose nanofiber biomass aerogel. The preparation method of a cellulose nanofiber biomass gel of the present invention is simple and easy to control, low in cost, and environmentally friendly, and can prepare biomass gels and aerogels with good shape, high strength, and low fiber content. Biocompatible, non-toxic and harmless; the prepared biomass gel and aerogel with negative electrical properties have better reactivity and biological activity.

Description

technical field [0001] The invention relates to the application field of cellulose, in particular to a preparation method of cellulose nanofiber biomass gel and airgel. Background technique [0002] Cellulose is one of the most abundant natural biomass polymers in nature. Cellulose mainly exists in the secondary walls of plant cell walls, such as wood, bamboo, rice straw, cotton and other biomass. Cellulose is a structural biomacromolecule connected by molecular chains to form highly crystalline fibers in the nanoscale range. According to different biological sources, the cross-sectional width of natural cellulose crystal fibers varies from 2nm to 20nm. Cellulose forms higher-order hierarchies in biomass and can be isolated into nanofibers. The development of nanomaterials and nanotechnology has set off an upsurge in the field of new material research. At present, bio-nanofiber material technology has become a research hotspot of key projects and cutting-edge technologies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08B15/02C08J9/28C08L1/04
CPCC08J3/075C08B15/02C08J9/28C08J2201/0504C08J2205/026C08J2301/04
Inventor 王志国胡立江李俊施少伟刘石林刘亮
Owner HEYE HEALTH TECH CO LTD
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