High-strength anisotropic aerogel type wood structure and preparation method thereof

An anisotropic, aerogel technology, applied in the direction of wood impregnation, wood treatment, impregnated wood, etc., to achieve the effects of high strength, increased specific surface energy, and high efficiency heat transfer performance

Active Publication Date: 2022-06-28
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the contradiction between the high specific surface area and high porosity of airgel in the prior art and the improvement of its structural strength, the present invention provides an airgel-type wood structure in which nanofiber networks are generated in situ in wood microchannels and its preparation method to improve the disorder of the airgel network structure, increase the porosity and specific surface area of ​​wood, and give full play to the excellent performance of wood microchannel anisotropy from top to bottom

Method used

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  • High-strength anisotropic aerogel type wood structure and preparation method thereof
  • High-strength anisotropic aerogel type wood structure and preparation method thereof
  • High-strength anisotropic aerogel type wood structure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0056] A preparation method of a high-strength anisotropic aerogel-type wood structure, comprising the following steps and process conditions:

[0057] 1) Preparation of wood: Cut the balsa wood into 40mm×40mm×5mm blocks according to the cross-sectional direction (along the direction of wood growth), and purify it in an ethanol bath at 60°C for 2 hours, and dry it in a vacuum drying oven at 40°C for 2 hours. Pretreatment every day to keep the moisture content less than 15%;

[0058] 2) Wood solvent infiltration: immerse the wood block in 1-methyl-3-propenylimidazole ionic liquid at 60°C;

[0059] 3) Preparation of wood structure containing cellulose sol: the infiltrated wood block is dissolved in the above-mentioned ionic liquid at a temperature of 80 ° C, and the inner wall of the wood cell cavity is partially dissolved in situ by ultrasound, so that the fibers are dissolved and filled. into the cell cavity;

[0060] 4) Preparation of fiber-containing hydrogel wood structur...

Embodiment 2

[0073] A preparation method of a high-strength anisotropic aerogel-type wood structure, comprising the following steps and process conditions:

[0074] 1) Material preparation of wood: cut poplar wood into 30mm×30mm×4mm blocks according to the cross-sectional direction, and pre-process by ultrasonic treatment with ethanol for 1 hour and drying at 40° C. to maintain a moisture content of 5-8wt%;

[0075] 2) Wood solvent infiltration: fully infiltrate the wood block in a DMAC / LiCl (LiCl mass fraction of 8%) mixed solvent at normal temperature and pressure;

[0076] 3) Preparation of wood structure containing cellulose sol: the infiltrated wood block is dissolved at a temperature of 80°C, and the inner wall of the wood cell cavity is partially dissolved in situ by ultrasound, so that the fibers are dissolved and filled into the cell cavity pores;

[0077] 4) Preparation of fiber-containing hydrogel wood structure: the wood sample treated in step 3) is placed in acetone:water=1:1 ...

Embodiment 3

[0081] A preparation method of a high-strength anisotropic aerogel-type wood structure, comprising the following steps and process conditions:

[0082] 1) Preparation of wood: Cut the beech wood into 50mm×40mm×3mm pieces according to the cross-sectional direction, and let it stand for 3-10 hours with acetone:ethanol=1:1, and dry it naturally for pretreatment to keep the moisture content in the 10% or so;

[0083] 2) Wood solvent infiltration: fully infiltrate the wood block in the mixed solvent of NaOH: urea: water=7:12:81 under normal temperature and pressure;

[0084] 3) Preparation of wood structure containing cellulose sol: dissolve the infiltrated wood block at a temperature of -11 °C, and ultrasonically promote the partial dissolution of the inner wall of the wood cell cavity in situ, so that the fibers are dissolved and filled into the cell cavity. ;

[0085] 4) Preparation of fiber-containing hydrogel wood structure: the wood sample treated in step 3) is placed in 90...

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Abstract

The invention discloses a high-strength anisotropic aerogel type wood structure and a preparation method thereof. The method comprises the following steps: cutting log wood into wood blocks according to the direction of a cross section or a longitudinal section, performing pretreatment through purification and drying processes, and keeping the water content at 5-50%; immersing the obtained wood block in a wood dissolving system; the infiltrated wood block is subjected to ultrasonic treatment, so that fiber parts on the inner walls of the cell cavities are dissolved out and filled into cell cavity pore channels; the dissolved wood is placed in a regeneration solvent to be subjected to regeneration treatment for 0.1-100 hours; and the obtained wood block is placed in a replacement solvent, drying treatment is conducted, and the aerogel type wood is obtained. According to the aerogel type wood structure, an original anisotropic micro-channel of wood is reserved, and meanwhile the micro-channel is filled with a large number of nanometer networks with the size within 100 nm; the elasticity modulus of the prepared aerogel type wood structure is 156.2 + / -18 MPa, and the elasticity modulus of natural wood is 99.07 MPa.

Description

technical field [0001] The invention relates to an aerogel-type wood, in particular to a high-strength anisotropic aerogel-type wood structure in which a nanofiber network is generated in situ and a preparation method thereof, and belongs to the technical field of new materials. Background technique [0002] Wood is a widespread, renewable and environmentally friendly biomass structural substrate with unique aesthetics, strong mechanical properties, and excellent anisotropic material properties. It has long been used by people to build houses, decorate and make furniture, etc. , in recent years, due to its unique natural isotropic structure and natural porosity, it has been widely studied in the fields of bioengineering, flexible electronics, clean energy and environment. Wood itself is a natural porous structure, mainly composed of cellulose, hemicellulose and lignin, of which cellulose is the skeleton material, hemicellulose is the filler material, and lignin is the bondin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/20B27K5/00
CPCB27K5/0065B27K5/00B27K3/20Y02P20/54
Inventor 刘德桃李杨沈浩宇吴培琳段雨龙崔结东刘超城钱志云
Owner SOUTH CHINA UNIV OF TECH
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