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A kind of functional cellulose airgel composite material and preparation method thereof

A technology of cellulose aerogel and composite material, applied in the field of functional cellulose aerogel composite material and its preparation, can solve the problems of complex modification process, unsatisfactory effect and high cost, and achieves overcoming high brittleness and high product cost. Controllable style and thickness for low-cost effects

Active Publication Date: 2021-11-30
闰镁科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art modification process is more complicated, the effect is not ideal, the cycle is long, and the cost is high

Method used

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  • A kind of functional cellulose airgel composite material and preparation method thereof
  • A kind of functional cellulose airgel composite material and preparation method thereof
  • A kind of functional cellulose airgel composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The following steps were used to prepare functional nanocellulose airgel composites:

[0041] (1) Preparation of cellulose hydrogel. Weigh nanocellulose, water, and wet strength agent with a mass ratio of 5:200:1, and ultrasonically stir in ice water to obtain cellulose hydrogel.

[0042] (2) Quickly freeze the above hydrogel in liquid nitrogen, transfer to freeze-drying equipment, pre-freeze at -30°C for 1 h, vacuumize for 0.5 h, set step temperature, and freeze-dry for 12 h to obtain nanocellulose aerogels.

[0043] (3) Prepare the sol of silicon oxide and titanium oxide. Weigh tetraethyl orthosilicate, ethanol, and water at a mass ratio of 4:12:1, and stir thoroughly at room temperature to form a colorless and transparent silicon solution. Weigh butyl titanate, ethanol, and water at a ratio of 3:10:1, and stir thoroughly at room temperature to form a colorless and transparent titanium solution. Mix the silicon-titanium solution, wherein the mass ratio of silicon o...

Embodiment 2

[0049] The following steps were used to prepare functional nanocellulose airgel composites:

[0050] (1) Preparation of cellulose hydrogel. Weigh nanocellulose, water, and wet strength agent with a mass ratio of 5:200:1, and ultrasonically stir in ice water to obtain cellulose hydrogel.

[0051] (2) Quickly freeze the above hydrogel in liquid nitrogen, transfer to freeze-drying equipment, pre-freeze at -30°C for 1 h, vacuumize for 0.5 h, set step temperature, and freeze-dry for 12 h to obtain nanocellulose aerogels.

[0052] (3) Prepare the sol of silicon oxide and titanium oxide. Weigh tetraethyl orthosilicate, ethanol, and water at a mass ratio of 4:12:1, and stir thoroughly at room temperature to form a colorless and transparent silicon solution. Weigh butyl titanate, ethanol, and water at a ratio of 3:10:1, and stir thoroughly at room temperature to form a colorless and transparent titanium solution. Mix the silicon-titanium solution, wherein the mass ratio of silicon o...

Embodiment 3

[0058] The following steps were used to prepare functional nanocellulose airgel composites:

[0059] (1) Preparation of cellulose hydrogel. Weigh nanocellulose, water, and wet strength agent with a mass ratio of 6:200:1, and stir them rapidly in ice water to obtain cellulose hydrogel.

[0060] (2) Quickly freeze the above hydrogel in liquid nitrogen, transfer to freeze-drying equipment, pre-freeze at -40°C for 1 h, vacuumize for 0.5 h, set step temperature, and freeze-dry for 12 h to obtain nanocellulose airgel.

[0061] (3) Preparation of silica sol. Weigh tetraethyl orthosilicate, ethanol, and water at a mass ratio of 4:12:1, and stir thoroughly at room temperature to form a colorless and transparent solution. Weigh methyltriethoxysilane, ethanol, and water at a ratio of 3:10:1, and stir thoroughly at room temperature to form a colorless and transparent solution. Mix the two solutions at a volume ratio of 3:1 and stir well.

[0062] (4) Mix and stir ammonia water and eth...

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Abstract

The invention provides a functional cellulose airgel composite material and a preparation method thereof. The functional cellulose airgel composite material includes interpenetrating nanometer cellulose airgel and inorganic aerogel, which include The components and their mass percentages are: CNF 10%~50%, SiO 2 40%~90%, TiO 2 0% to 20%. Adopting the technical solution of the present invention, through the organic-inorganic hybrid treatment, the high porosity of cellulose airgel is retained, its compressive strength and hydrophobicity are greatly enhanced, its adsorption capacity is strong, its thermal conductivity is low, and it also has photocatalytic performance; On the basis of maintaining the porous three-dimensional network skeleton structure characteristics of the cellulose airgel, the obtained composite material overcomes the high brittleness and hydrophilicity of the airgel material, and has simple process, easy control and low cost.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a functional cellulose airgel composite material and a preparation method thereof. Background technique [0002] Cellulose airgel not only has the excellent properties of traditional airgel materials, but also incorporates its own good flexibility, biocompatibility and biodegradability. In addition, the polyhydroxy structure and special hierarchical structure of cellulose , It also makes it possible to form new functional cellulose-based materials through surface chemical modification and compounding with other polymers or nano-inorganic substances. Fiber airgel has a very wide range of applications in the fields of heat insulation, heat preservation, sound insulation, noise reduction, and oil absorption. For example, in the Chinese patent CN103205015B, the ionic liquid is used as a solvent to dissolve and defoam the cellulose, and then regenerate it in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091C04B28/24C04B2201/32C04B24/38C04B14/305C04B24/023C04B38/0045C04B38/0054
Inventor 陈晓星
Owner 闰镁科技(深圳)有限公司
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