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Solid wood fiber/SiO2 aerogel composite thermal insulation material and preparation method thereof

A technology of composite thermal insulation material and airgel, which is applied in the field of thermal insulation materials, can solve the problems of low mechanical strength and poor toughness of silica airgel, and solve the problems of easy water absorption and low utilization rate, increased hydrophobicity, and improved thermal insulation sexual effect

Active Publication Date: 2019-12-27
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of low mechanical strength and poor toughness of the existing silica airgel, and provides a method for preparing solid wood fiber / SiO by normal pressure drying. 2 The method of airgel composite insulation material

Method used

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  • Solid wood fiber/SiO2 aerogel composite thermal insulation material and preparation method thereof

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Embodiment 1

[0028] The solid wood fiber / SiO 2 The preparation method of the airgel composite thermal insulation material specifically comprises the following steps:

[0029] (1) Preparation of wood fiber matrix: 40g sodium hydroxide and 20.16g sodium sulfite were dissolved in 400ml water and mixed evenly to obtain NaOH (2.5mol / L) and NaOH 2 SO 3 (0.4mol / L) of the mixed solution A, the Balse wood block (20 × 20 × 20mm) was immersed in the mixed solution A and boiled for 16h, then it was taken out and rinsed with distilled water, and placed in 2.5mol / L H 2 o 2 Boil in medium until the yellow color disappears, take out and rinse with distilled water to obtain the balse fibrous matrix;

[0030] (2) Tetraethyl orthosilicate (TEOS), methyltrimethoxysilane (MTMS), absolute ethanol, deionized water, dimethylformamide (DMF) according to the ratio of 0.8:0.2:6:4:0.4 After the molar ratio is mixed uniformly, a colorless and transparent solution B is obtained, and then the balse fibrous matrix ob...

Embodiment 2

[0039] The solid wood fiber / SiO 2 The preparation method of the airgel composite thermal insulation material specifically comprises the following steps:

[0040] (1) Preparation of wood fiber matrix: 40g sodium hydroxide and 20.16g sodium sulfite were dissolved in 400ml water and mixed evenly to obtain NaOH (2.5mol / L) and NaOH 2 SO 3 (0.4mol / L) of the mixed solution A, the balse wood block (20 × 20 × 20mm) immersed in the mixed solution A boiled for 24h, took out and rinsed with distilled water, put it in H 2 0 2 (2.5mol / L) until the yellow disappears, take out and rinse with distilled water to obtain the Balse fibrous matrix;

[0041] (2) Tetraethyl orthosilicate (TEOS), methyltrimethoxysilane (MTMS), absolute ethanol, deionized water, dimethylformamide (DMF) according to the ratio of 0.8:0.2:6:4:0.4 After the molar ratio is mixed uniformly, a colorless and transparent solution B is obtained, and then the balse fibrous matrix obtained in the step (1) is fully immersed to ...

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Abstract

The invention provides a preparation method of a solid wood fiber / SiO2 aerogel composite thermal insulation material. The preparation method comprises the following steps: 1, immersing balsa wood in amixed solution of NaOH and NaSO3, boiling the liquid, moving out the balsa wood, washing the balsa wood with distilled water, adding H2O2, boiling the liquid, moving out the balsa wood, washing the balsa wood with distilled water to obtain a wood fiber substrate; 2, by means of tetraethoxysilane and methyltrimethoxysilane as a mixed silicon source and absolute ethyl alcohol as a solvent, uniformly mixing the components with water and the wood fiber substrate, adding hydrochloric acid until the pH value is 2-3, fully hydrolyzing the fiber substrate, adding ammonia water until the pH value is 8-9, performing standing treatment to form gel, and performing aging, surface modification, solvent exchange and normal pressure drying on the gel to obtain the solid wood fiber / SiO2 aerogel compositethermal insulation material. According to the method provided by the invention, the excellent properties of the balsa wood and the SiO2 aerogel are combined, so that the integrity of the SiO2 aerogelis improved, the problems that the fir absorbs water easily and the utilization rate is low are solved, and meanwhile, the heat preservation property of the balsa wood is improved. The preparation equipment is simple, convenient and low in cost, and has a good development prospect and further in-depth development and research value.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a solid wood fiber / SiO 2 Airgel composite thermal insulation material and preparation method thereof. Background technique [0002] Silicon dioxide (SiO 2 ) Airgel is a lightweight nanoporous amorphous solid material with a continuous three-dimensional network structure, composed of silica and air, with a porosity as high as 80%-99.8%, and mostly mesopores and macropores. Density can be as low as 3kg / m 3 , has excellent heat insulation and heat preservation properties, and the thermal conductivity at room temperature can be as low as 0.012W / (m·K). It is these properties that make airgel materials have broad application prospects in thermal, acoustic, optical, microelectronics, etc. However, the traditional preparation and drying method of silica airgel is to use supercritical fluid drying. The supercritical fluid drying process is complicated, the equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B38/08
CPCC04B30/02C04B2201/32C04B2201/20C04B18/265C04B14/064C04B38/08C04B38/0067
Inventor 宋伟杉刘士瑞孟杨陈瑶高建民
Owner BEIJING FORESTRY UNIVERSITY
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