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A kind of preparation method of functional nano-cellulose composite airgel

A technology of nano-cellulose and composite airgel, which is applied in the interdisciplinary fields of polymers, chemical engineering and nano-materials, can solve the problems of unstable cross-linked network structure, low mechanical properties, and unsatisfactory pore structure, and achieve easy control of the process , low production cost and simple method

Inactive Publication Date: 2019-02-12
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The preparation and modification of the above-mentioned nanocellulose composite airgel are mainly carried out by physical means, which limits the structure and strength properties of the nanocellulose composite airgel to a certain extent, such as low mechanical properties and unsatisfactory pore structure. , unstable cross-linked network structure, etc., which limit the application of aerogels to a certain extent

Method used

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  • A kind of preparation method of functional nano-cellulose composite airgel
  • A kind of preparation method of functional nano-cellulose composite airgel
  • A kind of preparation method of functional nano-cellulose composite airgel

Examples

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Effect test

Embodiment 1

[0029]Disperse 10g (dry weight) coniferous pulp plate in 500mL water, add 0.16g 2,2,6,6-tetramethylpiperidine-nitrogen-oxide and 1.6g sodium bromide at the same time, mix well and add 120mLNaClO Solution, mechanically stirred at room temperature, adjusted and controlled to pH 10.5 by 0.2mol / L NaOH solution, when the pH of the reaction mixture no longer increased, the reaction was stopped, and the resulting nanocellulose was acidified with 0.1mol / L HCl solution Vacuum filter and wash to neutral. The pH of the washed nanocellulose was adjusted to 10, ultrasonically dispersed in deionized water, and the concentration of the solution was adjusted to 1 wt%.

[0030] Put 12g of 1wt% nanocellulose solution and 0.48g of 25wt% polyethyleneimine aqueous solution in a specific mold, add water to dilute to 20mL, stir rapidly for 1h to disperse evenly. Stand at room temperature for 48 hours to obtain nanocellulose-polyethyleneimine hydrogel. Soak the above hydrogel in 0.1wt% glyoxal aque...

Embodiment 2

[0032] Disperse 10g (dry weight) coniferous pulp board in 400mL water, disperse for 10min at 3,000rpm with a deflaker, then process the dispersion at 1,440rpm for 30min to obtain a colloidal nanocellulose solution, adjust its concentration to 2wt% . Take 50g of the above-mentioned 2wt% nanocellulose solution and dilute it to a concentration of 1wt% with a buffer solution with a pH of 7.6, add 2.4g MgCl 2 and 2.8 g of adenosine triphosphate disodium (ATP), while adding hexokinase and controlling the concentration to 35 U / mL, the above mixed solution was reacted at 30° C. for 24 hours. After enzyme inactivation, the phosphorylated nanocellulose was repeatedly washed with deionized water (centrifuged at 6000 rpm for 4 min) until no ATP absorption was detected at a wavelength of 260 nm. The concentration of the washed phosphorylated nanocellulose was adjusted to 1% with deionized water.

[0033] Place 12g of 1wt% phosphated nanocellulose solution, 0.48g of 25wt% polyethyleneimin...

Embodiment 3

[0035] Fully bleached coniferous wood will be pulverized in a pulverizer and crossed a 20-mesh sieve, and the obtained cellulose powder (50.0g) is added to 500mL 64wt%H 2 SO 4 , heated to 45°C under stirring for 45 minutes, then added 10 times deionized water to dilute to terminate the reaction. The mixture was centrifuged at 5000rpm for 10min, and the supernatant was removed. The resulting precipitate was redispersed in deionized water and dialyzed with a regenerated cellulose membrane with a molecular weight cut-off of 12000-14000 for 7 days until the pH value remained unchanged. The dialyzed mixed solution was ultrasonically dispersed in an ice-water bath for 30 minutes, and the obtained sulfonic acid cellulose nanocrystal dispersion was treated with a mixed bed ion exchange resin, adjusted to 1 wt%, and stored in a refrigerator at 5°C.

[0036] Weigh 5g of dried chitosan powder into a four-necked flask, and add 100mL of isopropanol to swell for 30min; then slowly add 10g ...

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Abstract

The invention relates to a preparation method of functional nano-cellulose composite aerogel and belongs to the cross technical field of high-polymer chemistry and chemical engineering and nanometer materials. Firstly, hydrogel is formed through gelation in a water solution under electrostatic interaction between nano-cellulose and a cationic polymer, functional additives are supported in a gelation process, hydrogel with the functional additives supported is obtained and added to a chemical crosslinking agent solution for chemical enhanced crosslinking, and finally, the nano-cellulose composite aerogel is obtained through drying. The method adopts a simple preparation process, adopted raw materials for preparation are environmentally friendly and economic, and the prepared functional nano-cellulose composite aerogel is of a nano-mesoporous three-dimensional network structure, has higher porosity and is stable in structure and excellent in mechanical property.

Description

technical field [0001] The invention discloses a preparation method of functional nano-cellulose composite airgel, in particular relates to a preparation method of airgel which is gelled by physical electrostatic action and combined with chemical cross-linking enhancement, which belongs to polymer, chemical Chemical industry and nanomaterials intersect technical field. Background technique [0002] Airgel is a lightweight, porous, reticulated solid material, which is generally obtained by displacing the liquid in the wet gel with gas through a drying process (Du A, Zhou B, Zhang Z H, et al.Materials, 2013, 6:941-968.). Airgel materials have the characteristics of high specific surface area, high porosity, low density, and high adsorption. Nanocellulose is a cellulose aggregate array formed by separating microfibrils and extracting cellulose crystals, with a diameter of less than 100 nm and a length ranging from hundreds of nanometers to microns. Nanocellulose has the adva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/24C08K3/08C08K3/30C08K3/22C08L1/02C08L79/02C08L5/08C08L33/26
Inventor 吴伟兵左克曼宋如愿戴红旗
Owner NANJING FORESTRY UNIV
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