Anisotropic wood-based nanofiber aerogel and preparation method thereof

A nanofiber, anisotropic technology, applied in the field of anisotropic wood-based nanofiber aerogel and its preparation, can solve the problems of high specific surface area, high porosity, and high preparation cost, and achieve broad application prospects and good compression. The effect of performance and low preparation cost

Inactive Publication Date: 2019-04-12
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Although this "bottom-up" preparation method can obtain airgel materials with low density, high porosity, and high specific surface area, the commonly used structural unit of cellulose aerogels—nanocellulose (CNF) is mainly Separation and extraction from plant cell walls, the whole process requires complex chemical and mechanical treatment, consumes a lot of chemicals and energy, and its preparation cost is high, which limits the large-scale production of cellulose aerogels
In addition, at present, nanocellulose airgel is mainly prepared by vacuum freeze-drying method. The prepared airgel material generally has a disordered three-dimensional network structure (isotropic), and its mechanical properties are poor, and it is easy to damage, poor structural stability

Method used

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  • Anisotropic wood-based nanofiber aerogel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Prepare a sodium chlorite solution with a concentration of 2%, and adjust the pH to 4.5 with acetic acid, and make a balsa wood block with a size of 20mm×20mm×20mm (density about 90mg / cm 3 ) immersed in an acidic sodium chlorite solution and treated at 80°C for 8 hours;

[0030] Immerse the above treated wood in 25% hydrogen peroxide solution, heat treatment at 50°C for 10 hours;

[0031] The above-mentioned treated wood was further put into 8% sodium hydroxide solution, and treated at 70°C for 8 hours to obtain a wood-based nanofiber hydrogel material; the hydrogel material was repeatedly washed with distilled water to remove residual chemicals;

[0032] Soaking the above-mentioned nanofibrous hydrogel in a gradient solution of tert-butanol for 20 hours at room temperature to replace the water in the hydrogel to form a nanofibrillar sol;

[0033] The above-mentioned nanofiber alcohol sol was frozen in a refrigerator for 8 hours, and then moved to a vacuum freeze dryer...

Embodiment 2

[0035] Embodiment 2: A kind of preparation method of anisotropic wood-based nanofiber aerogel, the steps are as follows: (1) select density as 80~150mg / cm 3 The balsa wood is the initial raw material, washed with distilled water, and air-dried for subsequent use;

[0036] (2) Wood is immersed in acidic sodium chlorite solution to carry out delignification treatment, and the treatment time is 5 hours;

[0037] (3) Dip the above-mentioned treated wood in the hydrogen peroxide solution, and heat treatment;

[0038] (4) Immerse the above-mentioned treated wood in a sodium hydroxide solution, heat treatment at 80° C. for 6 hours to obtain a wood-based nanofiber hydrogel, and wash the hydrogel material with distilled water;

[0039] (5) Soak the above-mentioned nanofiber hydrogel in tert-butanol solutions with three concentration gradients sequentially at room temperature, and soak in each solution for 20 hours to obtain nanofiber alcohol sol;

[0040] (6) Vacuum freeze-drying the a...

Embodiment 3

[0041] Embodiment 3: A kind of preparation method of anisotropic wood-based nanofiber aerogel, the steps are as follows: (1) select density as 80~150mg / cm 3 The balsa wood is the initial raw material, washed with distilled water, and air-dried for subsequent use;

[0042] (2) Submerging the wood in an acidic sodium chlorite solution for delignification treatment, the treatment time is 3 to 9 hours;

[0043] (3) Dip the above-mentioned treated wood in the hydrogen peroxide solution, and heat treatment;

[0044] (4) Immerse the above-mentioned treated wood in a sodium hydroxide solution, heat treatment at 90° C. for 10 hours to obtain a wood-based nanofiber hydrogel, and wash the hydrogel material with distilled water;

[0045] (5) Soak the above-mentioned nanofiber hydrogel in tert-butanol solutions with three concentration gradients sequentially at room temperature, and soak in each solution for 22 hours to obtain nanofiber alcohol sol;

[0046] (6) vacuum freeze-drying the ...

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Abstract

The invention discloses an anisotropic wood-based nanofiber aerogel. The aerogel is obtained by the following steps: light wood with a density of 80-150 mg/cm<3> is adopted, delignification treatmentis performed, dehemicellulose treatment is performed to prepare a wood-based nanofiber hydrogel, water in the hydrogel is replaced to obtain a nanofiber alcohol sol, freeze drying is performed, and therefore the aerogel is obtained. The invention also discloses the specific preparation method. According to the method provided by the invention, the wood-based nanofiber aerogel prepared by the method has a low density, high porosity, good compression performance and elasticity, is a green environmentally-friendly aerogel material, has low preparation costs, can be produced in a large scale, andhas board application prospects in the fields of thermal insulation, noise insulation, adsorption catalysis, biomedicine, energy storage and the like.

Description

technical field [0001] The invention belongs to the technical field of nanofiber airgel; more specifically, it relates to an anisotropic wood-based nanofiber airgel and a preparation method thereof. Background technique: [0002] Airgel is a solid material with a three-dimensional porous network structure formed by removing the liquid solvent in the gel under the condition that the three-dimensional network structure of the gel is kept unchanged. Airgel materials usually have a large number of nano-sized pore structures, endowing the material with high porosity, high specific surface area, low density, and excellent sound and heat insulation properties. In 1931, American scientist Kistler prepared silicon dioxide (SiO2) for the first time by hydrolyzing water glass. 2 ) airgel. Since the 1970s, with the rapid development of sol-gel technology, SiO 2 The basic research and application development of synthetic polymer aerogels represented by resorcinol / formaldehyde and mela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/02D21C5/00
CPCC08J9/28C08J2301/02D21C5/00
Inventor 王小青管浩刘君良倪林程志泳孟军旺
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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