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Preparation method of self-hydrophobic silicon dioxide aerogel composite material

A technology of silica and composite materials, which is applied in the field of preparation of self-hydrophobic silica airgel composite materials, can solve the problems of complex hydrophobic modification process, achieve uniform distribution of pore structure, easy control, and simplify the process flow Effect

Inactive Publication Date: 2019-03-08
GUIZHOU AEROSPACE WUJIANG MACHINERY & ELECTRICITYEQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of self-hydrophobic silica airgel composite material, to solve the problem of the complexity of the hydrophobic modification process of silica airgel composite material, to reduce its production cost and realize industrialization The purpose of mass production is to broaden the application range of silica airgel composite materials, so as to overcome the shortcomings of existing technologies

Method used

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preparation example Construction

[0027] A kind of preparation method of self-hydrophobic silica airgel composite material of the present invention, the method comprises the following steps:

[0028] 1) The preparation of the sol, the sol is prepared by including silicon source precursors, hydrophobic modifiers, solvents, water and hydrolysis catalyst raw materials; the silicon source precursors include ethyl orthosilicate, methyl orthosilicate, methyl triethyl Oxysilane, methyltrimethoxysilane, trimethylchlorosilane or a mixture of two or more, the hydrophobic modifier includes methyltriethoxysilane, methyltrimethoxysilane One or two combinations, the hydrolysis catalyst includes hydrochloric acid, oxalic acid, nitric acid, sulfuric acid, acetic acid, one or more combinations of ammonia, ammonium carbonate, ammonium bicarbonate, the water is pure water or ultrapure Water, the solvent includes one or more combinations of methanol, ethanol, butanol, and linear alcohols with a mass fraction of more than 96%, and...

Embodiment 1

[0034] The preparation method of the self-hydrophobic silica airgel composite material comprises the following steps: preparation of sol→compounding of sol and matrix material to prepare alcohol gel→aging of alcohol gel→drying→detection. Prepare the sol according to the following molar ratio components: ethyl orthosilicate: methyltriethoxysilane: 99% industrial methanol: water=1:0.57:39.55:0.77, and the volume addition of the hydrolysis catalyst is the total volume of the above mixed solution 0.33‰. Reaction time 5h. Add an appropriate amount of basic catalyst to the above sol, adjust the PH value to 7~9, inject and lay a layer with a thickness of 10mm and a density of 165kg / m 3In the shallow groove of the glass fiber needle mat, the glass fiber mat is saturated to absorb the glue solution, the glass fiber mat has no bubbles or depressions, and the upper and lower surfaces are even and flat, and the conveyor belt is started to obtain the glass fiber mat airgel wet material. ...

Embodiment 2

[0037] The preparation method of the self-hydrophobic silica airgel composite material comprises the following steps: preparation of sol→compounding of sol and matrix material to prepare alcohol gel→aging of alcohol gel→drying→detection. Prepare the sol according to the following molar ratio components: ethyl orthosilicate: methyltriethoxysilane: 99% industrial methanol: water=1:0.57:39.55:0.77, and the volume addition of the hydrolysis catalyst is the total volume of the above mixed solution 0.33‰. Reaction time 5h. Add an appropriate amount of basic catalyst to the above sol, adjust the pH value to 7-9, inject and lay a layer with a thickness of 10mm and a density of 185kg / m 3 In the shallow groove of the ceramic fiber felt, the ceramic fiber felt is saturated to absorb the glue, the ceramic fiber felt has no bubbles or depressions, and the upper and lower surfaces are even and smooth, and the conveyor belt is started to obtain the ceramic fiber felt airgel wet material. T...

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Abstract

The invention discloses a preparation method of a self-hydrophobic silicon dioxide aerogel composite material. The method comprises the following steps of (1) sol preparation: preparing the sol from raw materials comprising silicon source precursors, hydrophobic modifiers, solvents, water and hydrolysis catalysts; (2) alcogel preparation by compounding sol and substrates; (3) aging of alcogel; (4)silicon dioxide aerogel composite material preparation by supercritical CO2 drying of aged alcogel; (5) aerogel composite material finished product correlation performance detection. The prepared self-hydrophobic silicon dioxide aerogel composite material has the excellent heat insulation performance, waterproof performance, fireproof and mechanical performance; the construction is convenient. The preparation method avoids a single hydrophobic modification step; the technical production steps are simplified; the operation is simple and easy; the process is controllable; the production continuity is realized.

Description

technical field [0001] The invention relates to a preparation method of a self-hydrophobic silica airgel composite material, belonging to the technical field of nanocomposite material production. Background technique [0002] SiO 2 Airgel is a light nanoporous amorphous solid material with controllable structure, its porosity is as high as 80%-99.8%, the pore size is 1-100nm, and the high specific surface area is 200-1000 m 2 / g, low density change range 3~500kg / m 3 , The thermal conductivity at normal temperature and pressure is less than 0.013 W / m.K, which is lower than that of still air (0.026 W / m.K), and it is the solid material with the lowest thermal conductivity at present. [0003] At present, the main problems faced by the industrialization of silica airgel include: complex preparation process, long preparation cycle, expensive raw materials, large solvent consumption, and many waste liquids, etc., which seriously limit the popularization and application of airgel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B111/27C04B111/28C04B111/40
CPCC04B30/02C04B2111/27C04B2111/28C04B2111/40C04B2201/20C04B2201/32C04B14/064C04B14/42C04B24/42C04B14/46
Inventor 曹勇朱成业宋大为
Owner GUIZHOU AEROSPACE WUJIANG MACHINERY & ELECTRICITYEQUIP
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