Preparation method for spherical cellulose aerogel

A technology of cellulose airgel and cellulose hydrogel, which is applied in the field of airgel preparation, can solve the problems of structural collapse, low specific surface area of ​​airgel, volume shrinkage, etc., achieve low cost, overcome structural collapse, The effect of easy operation

Active Publication Date: 2013-09-25
NORTHEAST FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing spherical cellulose aerogels in order to solve the problems that the existing cellulose aerogels are prone to structural collapse and volume shrinkage, and the obtained aerogels have a low specific surface area

Method used

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  • Preparation method for spherical cellulose aerogel
  • Preparation method for spherical cellulose aerogel
  • Preparation method for spherical cellulose aerogel

Examples

Experimental program
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specific Embodiment approach 1

[0017] Specific embodiment one: the preparation method of spherical cellulose airgel in this embodiment is realized according to the following steps:

[0018] 1. Weigh 1.00~3.00g of plant fiber and put it into the mixed solution of urea and NaOH to obtain a mixed system. Put the mixed system at -18~-20℃ and freeze it for 2~4 hours, take it out, and thaw it at room temperature , and then stirred into a solution to obtain a plant fiber / alkali urea solution;

[0019] 2. Mix 100-200mL of chloroform and 100-200mL of ethyl acetate evenly, and then add 20-40mL of glacial acetic acid to obtain an organic solution of glacial acetic acid;

[0020] 3. Titrate the plant fiber / alkali urea solution obtained in step 1 into the organic solution of glacial acetic acid in step 2 with a titration device to form beads, then place the beads in the organic solution of glacial acetic acid in step 2 for aging for 5~ After 15min, a white spherical gel was obtained;

[0021] 4. Put the white spherica...

specific Embodiment approach 2

[0024] Embodiment 2: This embodiment is different from Embodiment 1 in that the plant fiber is bamboo fiber, wood fiber or straw fiber. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass ratio of NaOH, urea and water in the mixed solution of urea and NaOH in step 1 is 7:12:81. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a preparation method for a spherical cellulose aerogel, which relates to a preparation method for an aerogel. The objective of the invention is to overcome the problems that the phenomena of structure collapse and volume contraction of a conventional cellulose aerogel frequently occur and the specific surface area of an obtained aerogel is small. The method comprises the following steps: 1, putting vegetable fiber in a mixed solution of urea and NaOH and carrying out stirring after refrigeration for formation of a solution so as to obtain a vegetable fiber/alkaline urea solution; 2, mixing trichloromethane with ethyl acetate and then adding glacial acetic acid so as to obtain an organic solution; 3, titrating the vegetable fiber/alkaline urea solution into the organic solution of glacial acetic acid and carrying out ageing so as to obtain a gel; 4, putting the gel into a glacial acetic acid solution for solidification; and 5, replacing a hydrogel successively with absolute ethyl alcohol and tert-butyl alcohol and carrying out refrigeration and freeze-drying so as to obtain the aerogel. According to the invention, the phenomena of structure collapse and volume contraction of an aerogel in the process of drying are overcome, and the prepared cellulose aerogel has low density and a specific surface area of more than 240 m<2>/g.

Description

technical field [0001] The invention relates to a preparation method of airgel. Background technique [0002] Airgel is a highly dispersed solid material in which colloidal particles or polymer molecules aggregate into a nanoporous network structure, and the pores are filled with a gaseous dispersion medium. Common preparation methods mainly include sol-gel method and solution regeneration method. Compared with the solution regeneration method, the cost of the sol-gel method is relatively high. In addition, during the preparation process of airgel, phenomena such as structural collapse and volume shrinkage usually occur, which seriously damage the structure of the airgel, thereby affecting its high performance. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing spherical cellulose aerogels in order to solve the problems that the existing cellulose aerogels are prone to structural collapse and volume shrinkage, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/075C08L1/02
Inventor 刘志明杨少丽吴鹏李坚
Owner NORTHEAST FORESTRY UNIVERSITY
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