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Rapid preparation method for A-grade noncombustible silica aerogel

A silica aerogel and aerogel technology, applied in the directions of silica and silicon dioxide, can solve the problems of excessive organic compound content, restricting the popularization and use of aerogel, and being unable to be widely used in the building exterior wall insulation industry, etc. To achieve the effect of saving consumption

Active Publication Date: 2015-09-09
IBIH ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although the prepared airgel material has hydrophobicity, due to the excessive content of organic compounds, it cannot meet the standard of Class A non-combustible materials, so it cannot be widely used in the building exterior wall insulation industry, which limits the popularization and use of airgel

Method used

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  • Rapid preparation method for A-grade noncombustible silica aerogel
  • Rapid preparation method for A-grade noncombustible silica aerogel
  • Rapid preparation method for A-grade noncombustible silica aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 500 grams of industrial methanol with a content of 90-95% is extracted, and 1 wt% aqueous hydrochloric acid solution is added dropwise to adjust the pH of the system to 1. After stirring evenly, add 150 grams of methyl orthosilicate (99%wt) and 50 grams of methyl triethoxysilane mixture dropwise at a constant speed, and after stirring at a constant speed for about 10-40 minutes, drop in 1% concentration of hydroxide The sodium aqueous solution is used to increase the pH value, stir evenly, and after standing for 10-60 minutes, a gel is formed. Supercritical drying can be performed after the gel is placed in an environment of 50°C for 5 hours of aging. Place the aged gel in an autoclave and seal it, and slowly inject liquid CO into the autoclave 2 , and raise the temperature in the kettle to about 60°C, at this time, the pressure in the kettle will rise to 10-15MPa, within this temperature and pressure range, use CO 2 Replace the methanol in the kettle, and after about...

Embodiment 2

[0033]Sol-gel preparation: extract 500 grams of industrial methanol with a content of 90-95%, add dropwise an aqueous solution of acetic acid with a concentration of 10 wt%, and adjust the pH of the system to 4. After stirring evenly, add 150 grams of methyl orthosilicate (99%wt) and 50 grams of methyl triethoxysilane mixture dropwise at a constant speed, and after stirring at a constant speed for about 10-40 minutes, drop in 1% concentration of hydroxide The sodium aqueous solution is adjusted to a pH value of 8, and the silica sol is prepared by stirring evenly. The silica sol is injected into a glass fiber blanket with a length, width, and thickness of 20cm, 20cm, and 1cm, and the gel is formed after standing for 10-60 minutes. Fiberglass blanket. Place the gel glass fiber mat in an environment of 50°C for 5 hours and then proceed to supercritical drying.

[0034] Supercritical drying: place the aged gel glass fiber blanket in an autoclave and seal it, inject liquid CO int...

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Abstract

The invention relates to an A-grade hydrophobic silica aerogel and aerogel composite material and a preparation method therefor. The preparation method comprises the steps of: (1) hydrolyzing a proportioning liquid of silicate ester and methylethoxysilane with an acid catalyst in alcohol to obtain sol; (2) adding an alkali catalyst into the sol to regulate the pH value of the sol to 6-10 so as to obtain alkali sol, and then forming wet gel by the alkali sol; or compounding the alkali sol with inorganic fibers to prepare a gel fiber composite material after obtaining the alkali sol; (3) putting aged wet gel or gel fiber composite material into a CO2 supercritical device to dry, and replacing alcohol in pores with CO2 to obtain dried silica aerogel; and (4) spraying a silane compound to the surface of a dried silica aerogel or oxygel fiber composite material, and heating a body of the silica aerogel or oxygel fiber composite material to carry out hydrophobic modification, thereby obtaining noncombustible hydrophobic silica aerogel.

Description

technical field [0001] The invention relates to the field of airgel production, in particular to a preparation method of Class A non-combustible silica airgel and to a non-combustible silica airgel product prepared by the method. Background technique [0002] Airgel is known as one of the ten most potential new materials in the future, due to its porosity as high as 90%, thermal conductivity and density as low as 0.01W / m.K and 0.03g / cm 3 , so it has unparalleled advantages in heat preservation, heat insulation, noise reduction, sound insulation, etc., and will definitely contribute to energy conservation and emission reduction in the future. [0003] Airgel was invented by Professor Kistler of Stanford University in 1931, using water glass as a silicon source, and aerogel was prepared by sol-gel process, but the process is complicated and has not been applied. [0004] In the 1960s, Nicolaon et al. used silicon alkoxide as a precursor to prepare wet gel by sol-gel process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 田雷董海兵
Owner IBIH ADVANCED MATERIALS CO LTD