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Ultra-amphiphobic NFC (nano-fibrillated cellulose) aerogel based on directional freezing as well as preparation method and application of NFC aerogel

A nanocellulose, directional freezing technology, applied in the field of aerogel, can solve the problems of limited application range, high porosity and specific surface area, good hydrophilicity of nanocellulose aerogel, etc., to improve strength and application. performance effect

Active Publication Date: 2019-08-30
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the good hydrophilicity, high porosity and specific surface area of ​​nanocellulose airgel, the hydrophobicity and oil resistance are poor, which greatly limits its application range.

Method used

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  • Ultra-amphiphobic NFC (nano-fibrillated cellulose) aerogel based on directional freezing as well as preparation method and application of NFC aerogel
  • Ultra-amphiphobic NFC (nano-fibrillated cellulose) aerogel based on directional freezing as well as preparation method and application of NFC aerogel
  • Ultra-amphiphobic NFC (nano-fibrillated cellulose) aerogel based on directional freezing as well as preparation method and application of NFC aerogel

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing of description, the present invention will be further described.

[0032] The invention provides a method for preparing super-amphiphobic nano-cellulose airgel based on directional freezing, using nano-cellulose (NFC) as a raw material and dimethyl sulfoxide (DMSO) as an additive, and preparing cellulose air based on directional freezing Gel; and then using trichloro-(1H,1H,2H,2H-heptadecafluorodecyl)silane as a low surface energy modification agent, the super amphiphobic nano-cellulose airgel was prepared by chemical vapor deposition modification .

[0033] Concrete preparation method comprises the following steps:

[0034] 1) Prepare nanocellulose with a set concentration by TEMPO oxidation;

[0035] 2) adding dimethyl sulfoxide to the nanocellulose solution, stirring evenly to prepare a mixed solution;

[0036] 3) Inject the mixed liquid into the mold, then wrap the two sides of the mold filled with the mixed liquid w...

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Abstract

The invention discloses a preparation method of ultra-amphiphobic NFC (nano-fibrillated cellulose) aerogel based on directional freezing. The method comprises the steps as follows: preparing celluloseaerogel from NFC as a raw material and DMSO (dimethyl sulfoxide) as an additive by directional freezing; preparing the ultra-amphiphobic NFC aerogel from trichloro-(1H,1H,2H,2H-heptadecafluorodecyl)silane as a low surface energy modifier by chemical vapor deposition modification. The NFC mixed solution is solidified with a directional freezing method, the special hydrogen bond formed by DMSO andwater affects growth of liquid solvent ice crystals, so that micron-sized flaky and nano-fiber structures exist in the composite aerogel simultaneously, and an ideal micro / nano complex rough structureis formed; the surface energy is reduced by fluoroalkyl on the aerogel surface, the surface has the liquid repelling capability, and thus, the ultra-amphiphobic surface is generated, strength of theaerogel is improved, the aerogel has ultra-amphiphobic property, and practical application performance can be greatly improved.

Description

technical field [0001] The invention relates to a composite airgel, in particular to a superamphiphobic nano-cellulose airgel based on directional freezing, its preparation method and application, and belongs to the technical field of airgel. Background technique [0002] Nanocellulose airgel is a lightweight three-dimensional porous material with high specific surface area, high porosity, ultra-low density and excellent thermal insulation properties. However, due to the good hydrophilicity, high porosity and specific surface area of ​​nanocellulose airgel, the hydrophobicity and oil resistance are poor, which greatly limits its application range. Therefore, it is beneficial to improve the strength of nanocellulose aerogels and endow them with superamphiphobic properties (superhydrophobic and superoleophobic), thereby greatly improving the practical application performance of nanocellulose aerogels. . Contents of the invention [0003] The main purpose of the present inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08J9/28C08L1/02
CPCC08J9/36C08J9/28C08J2301/02C08J2201/0484
Inventor 吴伟兵吴晶晶左克曼戴红旗
Owner NANJING FORESTRY UNIV
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