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Anisotropic nano-cellulose/montmorillonite composite aerogel and preparation method thereof

A technology of nanocellulose and composite airgel, which is applied in the field of nanocellulose/montmorillonite composite airgel and its preparation, and can solve the problems of limited application range, low thermal stability and brittleness of nanocellulose aerogel Large and other problems, to achieve the effect of improving thermal stability, good mechanical properties, good shape memory function

Inactive Publication Date: 2016-02-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nanocellulose airgel is mainly prepared by vacuum freeze-drying method. This kind of airgel shows a foam-like structure, uniform pore size and equal pore size, and has isotropic mechanical properties. At the same time, it has a large brittleness. , the disadvantage of poor stiffness, and as a biomass raw material, when the temperature reaches about 350 ° C, the nanocellulose airgel will undergo obvious thermal degradation, so its thermal stability is not high
This severely limits the scope of use of nanocellulose aerogels

Method used

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  • Anisotropic nano-cellulose/montmorillonite composite aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the anisotropic nano-cellulose / montmorillonite composite airgel, its step comprises:

[0027] (1) Take quantitative nanocellulose and configure it with deionized water to form a suspension of nanocellulose with a concentration of 0.5%, then stir it with a magnetic stirrer at room temperature for 18 hours, and finally ultrasonically disperse it at a power of 800W for 20 minutes to obtain a mass Nanocellulose suspension with a fraction of 0.3%;

[0028] Take a quantitative amount of sodium ion montmorillonite clay and put it in an oven to dry at 100±2°C for 2 hours, then use deionized water to prepare a suspension of montmorillonite with a concentration of 1%; after stirring for 1 week at room temperature with a magnetic stirrer , then ultrasonically treated for 2 hours at a power of 300W, and then centrifuged at 8000rpm for 8 minutes to obtain a montmorillonite suspension with a mass fraction of 0.3%;

[0029] (2) The montmorillonite suspension...

Embodiment 2

[0036] The preparation method of the anisotropic nano-cellulose / montmorillonite composite airgel, its step comprises:

[0037] (1) Take quantitative nanocellulose and configure it with deionized water to form a suspension of nanocellulose with a concentration of 1.5%, then stir it with a magnetic stirrer at room temperature for 36 hours, and finally ultrasonically disperse it at a power of 800W for 30 minutes to obtain a mass Nanocellulose suspension with a fraction of 1%;

[0038] Take a quantitative amount of sodium ion montmorillonite clay and put it in an oven and dry it at 100±2°C for 2 hours, then use deionized water to prepare a suspension of montmorillonite with a concentration of 0.5%; stir at room temperature for 140 hours with a magnetic stirrer, Ultrasonic treatment was performed for 3 hours at a power of 400W, and then centrifuged at 8000rpm for 10 minutes to obtain a montmorillonite suspension with a mass fraction of 0.1%.

[0039](2) The montmorillonite suspens...

Embodiment 3

[0046] The preparation method of the anisotropic nano-cellulose / montmorillonite composite airgel, its step comprises:

[0047] (1) Take quantitative nanocellulose and configure it with deionized water to form a nanocellulose suspension with a concentration of 1.0%, then stir it for 24 hours at room temperature with a magnetic stirrer, and finally ultrasonically disperse it at a power of 800W for 25 minutes to obtain a mass Nanocellulose suspension with a fraction of 1%;

[0048] Take a quantitative amount of sodium ion montmorillonite clay and put it in an oven and dry it at 100±2°C for 2 hours, then use deionized water to prepare a montmorillonite suspension with a concentration of 4%; after stirring for 1 week at room temperature with a magnetic stirrer , then sonicated for 2.5 hours at a power of 400W, and then centrifuged at 8000rpm for 15 minutes to obtain a montmorillonite suspension with a mass fraction of 2%;

[0049] (2) The montmorillonite suspension is added to the...

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Abstract

The invention discloses anisotropic nano-cellulose / montmorillonite composite aerogel. The aerogel is prepared by mixing a nano-cellulose suspension with a montmorillonite suspension and performing freeze casting. The invention further discloses a preparation method of the aerogel. The method comprises the following steps: (1) respectively preparing nano-cellulose suspension and montmorillonite suspension; (2) mixing the montmorillonite suspension with the nano-cellulose suspension to form uniformly dispersed nano-cellulose / montmorillonite suspension; (3) performing freeze casting on the nano-cellulose / montmorillonite suspension to obtain the nano-cellulose / montmorillonite composite aerogel. The rigidity and heat tolerance of the nano-cellulose aerogel are improved by adding the montmorillonite, and the anisotropic honeycomb shaped aerogel is prepared by means of a directional freeze drying method; and the mechanical performance of the anisotropic nano-cellulose / montmorillonite composite aerogel is superior to that of anisotropic foam-shaped nano-cellulose / montmorillonite composite aerogel prepared by a conventional freeze drying method since the stress of the aerogel mainly depends on cell wall stretching of the material rather than bending deformation of the material.

Description

technical field [0001] The invention relates to anisotropic nano-cellulose / montmorillonite composite airgel and a preparation method thereof, belonging to the fields of bioengineering and new materials. Background technique [0002] Airgel, also known as xerogel, refers to a bulk material in which most of the solvent in the gel is removed, so that the space network structure of the gel is filled with a gas medium. The raw materials for the preparation of traditional aerogels are mostly silicon materials and metal oxides. In recent years, the research on preparing aerogels using graphene and carbon nanotubes as structural units has been increasing. Due to the advantages of low density, high specific surface area and high porosity, aerogels have been widely used in the fields of catalysts, supercapacitors and adsorbents. [0003] As a renewable resource with high strength, good toughness and large specific surface area, nanocellulose has attracted more and more attention. N...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L1/02C08K3/34
Inventor 何文李吉平金辉田佳西
Owner NANJING FORESTRY UNIV
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