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Method for preparing lignocellulose aerogel by using ionic liquid

A technology of lignocellulose and ionic liquids, applied in the field of preparation of lignocellulose airgel, can solve the problems of out-of-shape macroscopic rubber blocks and complicated raw material processing, and achieve the effects of broadening applications, increasing use value, and reducing costs

Inactive Publication Date: 2012-10-03
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems that the macroscopic rubber blocks are not formed and the raw materials are processed complicatedly during the preparation process of airgel directly prepared by using wood in the existing method, and provides a method for preparing lignocellulose airgel by using ionic liquid

Method used

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  • Method for preparing lignocellulose aerogel by using ionic liquid
  • Method for preparing lignocellulose aerogel by using ionic liquid
  • Method for preparing lignocellulose aerogel by using ionic liquid

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specific Embodiment approach 1

[0015] Embodiment 1: The method for preparing lignocellulose aerogels using ionic liquids in this embodiment is carried out according to the following steps: 1. After the wood is pulverized, it is passed through a 60-200 mesh sieve to obtain wood powder, and the wood powder and ionic liquid are subjected to Vacuum drying, mix 1-4 parts of dried wood flour with 20-80 parts of dried ionic liquid, heat to 80-130°C, stir for 0.5-4 hours to obtain a mixed solution; 2. Then seal the mixed solution into a mold , freeze at -196~-20°C, the freezing time is 2~24h, and then thaw the frozen mixed solution at a temperature 5~40°C higher than the melting point of the ionic liquid for 1~10h; 3. Repeat step 2 1 ~9 times, then add replacement solution I to the mold, the replacement time is 8h, and the number of replacements is 3~8 times to obtain lignocellulose gel; 4. Carry out critical point drying or drying to the lignocellulose gel obtained in step 3 Freeze-drying to obtain lignocellulose ...

specific Embodiment approach 2

[0016] Embodiment 2: This embodiment differs from Embodiment 1 in that the wood described in step 1 is the processing residue of branch wood. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0017] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, the wood is pulverized and passed through a 120-mesh sieve. Others are the same as in the first or second embodiment.

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Abstract

A method for preparing lignocellulose aerogel by using ionic liquid relates to a method for preparing lignocellulose aerogel, and aims to solve the problems of the prior art that during the preparation of aerogel by directly using woods, macroscopic gommures can not be shaped, and treatment of the raw material is complicated. The method is realized through the following steps: step I, timbers are smashed and then sieved to obtain wood flour, the wood flour and the ionic liquid are dried and mixed, and the mixture is heated to 80-130 degree C and stirred to obtain a mixed solution; step II, the mixed solution is refrigerated and thawed; step III, the step II is repeated for 1 to 9 times, and then displacement liquid I is added, so that lignocellulose gel is obtained; and step IV, the lignocellulose gel is treated by means of critical point drying or freeze drying, so that the lignocellulose aerogel can be obtained.

Description

technical field [0001] The invention relates to a method for preparing lignocellulose airgel. Background technique [0002] Inorganic airgel (aerogel) is a kind of light porous amorphous state, and a highly dispersed solid material solid material filled with gaseous dispersion medium in the pores. The particle size is between 1 and 100nm. It is a typical nanomaterial. , and 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 drying process to...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/11C08L97/02
CPCY02P20/54
Inventor 卢芸李坚孙庆丰刘一星
Owner NORTHEAST FORESTRY UNIVERSITY
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