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Method for preparing amorphous cellulose aerogel with ionic liquid

A technology of cellulose airgel and ionic liquid, which is applied in the production of bulk chemicals, etc., can solve the problems of inorganic aerogels being out of shape and poor toughness, and achieve the effects of improving use value, good mechanical strength, and broadening applications

Inactive Publication Date: 2012-05-09
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problems such as non-shaping and poor toughness in the preparation process of the existing inorganic airgel, and provides a method for preparing amorphous cellulose airgel by using ionic liquid

Method used

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  • Method for preparing amorphous cellulose aerogel with ionic liquid
  • Method for preparing amorphous cellulose aerogel with ionic liquid
  • Method for preparing amorphous cellulose aerogel with ionic liquid

Examples

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specific Embodiment approach 1

[0013] Specific embodiment one: utilize ionic liquid to prepare the method for amorphous airgel in this embodiment mode and carry out according to the following steps:

[0014] Step 1, drying the natural cellulose in vacuum;

[0015] Step 2, vacuum-dry the ionic liquid, then heat it to 80-150° C. with an oil bath, add the vacuum-dried natural cellulose, the vacuum-dried natural cellulose accounts for the vacuum-dried natural cellulose and the vacuum-dried natural cellulose 0.5% to 20% of the total mass of the liquid, stirred until a uniform transparent solution, the ionic liquid is chlorinated salts of quaternary ammoniums, dialkylimidazoles, N-alkylpyridines, carboxylates of quaternary ammoniums and Dialkylimidazoles, N-alkylpyridines, alkyl phosphate salts of quaternary ammoniums (such as 1-allyl-3-methylimidazolium chloride ionic liquid or 1-butyl-3-methylimidazolium Chloride salt ionic liquid), then cooled to room temperature, poured into the mold, and sealed;

[0016] S...

specific Embodiment approach 2

[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the natural cellulose in Step 1 comes from cotton, wood, bamboo, hemp, bagasse, straw or coconut shell. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that: in step 2, the oil bath is heated to 100-130°C. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a method for preparing an amorphous cellulose aerogel, and concretely relates to an amorphous cellulose aerogel with an ionic liquid. The invention aims to solve technical problems of shapelessness and bad toughness in present inorganic aerogel preparation processes. The method comprises the following steps: 1, dissolving cellulose in the ionic liquid, freeze-thawing multiple times, and displacing the ionic liquid out with a displacement liquid to obtain an amorphous cellulose hydrogel; and 2, carrying out supercritical drying and critical point drying on the hydrogelto obtain the amorphous cellulose aerogel. A novel cellulose material amorphous cellulose aerogel is prepared in the invention. The ionic liquid can be recovered and recycled, so a green preparation technology is realized, and the prepared aerogel has the advantages of nontoxicity, good shape and very good mechanical strength. The prepared new product cellulose aerogel can be applied to heat insulation, sound insulation, inorganic nanoparticle loading, virus filtration, biological scaffolds and the like, and the preparation method provides a new approach for the high efficiency utilization oflow quality biomass resources.

Description

technical field [0001] The invention relates to a preparation method of amorphous cellulose airgel. Background technique [0002] Inorganic airgel (aerogel) is a kind of light porous amorphous O, and a kind of highly dispersed solid material solid material whose pores are filled with gaseous dispersion medium. The particle size is between 1 and 100nm, which is a typical nanometer material, its porosity can reach 80% to 99.8%. Due to the specific porous nano-network structure of airgel, it has very excellent performance, and its density is as low as 1kg / m 3 , specific surface area up to 1000m 2 / g or more, the thermal conductivity is extremely low. These properties of airgel make it widely used in the fields of energy, electronics, environmental protection, medicine, aerospace, construction and scientific research. The preparation of airgel generally uses the sol-gel method to form a wet gel with a continuous dendritic network structure, and combined with an appropriate d...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/11C08L1/02
CPCY02P20/54
Inventor 卢芸孙庆丰刘一星于海鹏杨东江
Owner NORTHEAST FORESTRY UNIVERSITY
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