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Preparation method of nano-cellulose aerogel

A nanocellulose and aerogel technology is applied in the field of preparation of nanocellulose aerogel, which can solve the problems of poor dispersibility of cellulose aerogel, and achieve the effects of low cost, simple preparation method and easy operation.

Inactive Publication Date: 2013-06-05
NORTHEAST FORESTRY UNIVERSITY +1
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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 provide a preparation method of nano-cellulose airgel in order to solve the problem of poor dispersion of existing cellulose airgel

Method used

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  • Preparation method of nano-cellulose aerogel
  • Preparation method of nano-cellulose aerogel
  • Preparation method of nano-cellulose aerogel

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Experimental program
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specific Embodiment approach 1

[0017] Specific embodiment one: the preparation method of nanocellulose airgel in this embodiment is implemented according to the following steps:

[0018] 1. Dissolve absorbent cotton in a sulfuric acid solution with a mass fraction of 55% and acidify it for 3 to 6 hours to obtain a nanocellulose suspension. Centrifuge the nanocellulose suspension at a speed of 6000 to 10000 r / min for 8 to 15 minutes to obtain a white sol precipitate. Use deionized water to repeatedly wash the white sol precipitation to neutrality to obtain nanocellulose sol precipitation;

[0019] 2. According to the volume ratio of nano-cellulose sol precipitation and organic solvent as 1: (10-50), add the nano-cellulose sol precipitation in step 1 into the organic solvent, stir at 800r / min-1000r / min for 8-15min Put it into an ultrasonic cleaner and disperse it ultrasonically at 45 Hz for 5-10 minutes to obtain a suspension of nanocellulose dispersed in an organic solvent;

[0020] 3. Freeze the nanocellul...

specific Embodiment approach 2

[0025] Embodiment 2: This embodiment differs from Embodiment 1 in that in Step 1, 2.0 g of absorbent cotton is dissolved in 100 mL of sulfuric acid solution with a mass fraction of 55% for acid hydrolysis. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0026] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 1, the absorbent cotton is dissolved in a sulfuric acid solution with a mass fraction of 55%, and acidolyzed at 50°C. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a preparation method of nano-cellulose aerogel and relates to the preparation method of the nano-cellulose aerogel. The preparation method aims at solving the problem of poor dispersion of the existing cellulose aerogel in an organic solvent. The preparation method comprises the following steps: 1) dissolving absorbent cotton in a sulfuric acid solution for acidolysis, centrifugalizing, and then washing a white sol precipitate with deionized water to be neutral; 2) adding the nano-cellulose sol precipitate into the organic solvent, uniformly stirring, and then placing into an ultrasonic cleaning instrument for ultrasonic dispersion; and 3) placing a nano-cellulose suspension at the temperature of minus 18-minus 25 DEG C for freezing, and then further placing into a freeze-drying machine for freeze-drying. The nano-cellulose aerogel prepared by the invention has obvious nano-microfibril and nano-porous structure and can be rapidly dispersed in the organic solvent, such as dimethylformamide, dimethylacetamide and the like, the particle size of dispersed cellulose is nano-scale, and the good dispersion is shown. The preparation method disclosed by the invention can be applied to catalyst carriers, adsorbents and other fields.

Description

technical field [0001] The invention relates to a preparation method of nano cellulose airgel. Background technique [0002] Organic airgel is a kind of organic solid material with porous structure, low solid content and uniform low density. Compared with inorganic aerogel, it is easier to process and has better toughness. It is an important development direction of airgel material research. Based on the fact that cellulose has many hydroxyl groups, the preparation process of the gel can be very simple, and the aerogel can be prepared by physical cross-linking through hydrogen bonds without the need for a cross-linking agent. Natural cellulose has a wide range of sources, is renewable, easy to degrade and is green. No pollution and other characteristics, the preparation of cellulose airgel materials from cellulose has aroused great interest. [0003] However, the existing cellulose aerogel preparation process is mainly to prepare cellulose aerogel by dissolving cellulose wi...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/11C08L1/02
Inventor 刘志明谢成王海英吴鹏
Owner NORTHEAST FORESTRY UNIVERSITY
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