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A continuous preparation of boron-doped SiO 2 Airgel method

An aerogel and boron doping technology, which is applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of affecting the physical properties of silica aerogels, greatly affecting the thermal conductivity, and low porosity, achieving The effect of good light transmission, high continuity and high porosity

Inactive Publication Date: 2020-12-18
CANEW TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these substances exist between the aerogels in the state of larger particles, which seriously affect the physical properties of the silica airgel itself.
Make it denser and have lower porosity, which has a greater impact on its thermal conductivity

Method used

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  • A continuous preparation of boron-doped SiO <sub>2</sub> Airgel method
  • A continuous preparation of boron-doped SiO <sub>2</sub> Airgel method
  • A continuous preparation of boron-doped SiO <sub>2</sub> Airgel method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Take the modulus as 3.2, SiO 2 Content is 2842g of water glass of 72.14%, and with water glass, deionized water according to the ratio of molar ratio is 1:15 mixes evenly, carries out ion removal by cation exchange resin device, obtains silicic acid sol, then adds dehydrated alcohol, Methyltriethoxysilane, boric acid and hydrochloric acid solution are mixed, and the overall molar ratio of industrial water glass, deionized water, hydrochloric acid, boric acid, absolute ethanol and methyltriethoxysilane is 1:15:0.001:0.001: 10:0.1. After uniform mixing, measure the pH value of the mixed solution at this time to be 3.4, and let it stand for 1 hour. The amount of ammonia added is 5% of the molar amount of water glass, which is diluted and slowly added to the mixed sol, stirred while adding, and the amount of ammonia added is controlled by a flow rate meter. Carry out post-treatment of the gel according to the process of process 1. After the gel reaction occurs, extrude t...

Embodiment 2

[0059] Take the modulus as 3.2, SiO 2 Content is 2842g of water glass of 72.14%, and water glass, deionized water are mixed evenly according to the ratio of 1:10 according to molar ratio, carries out ion removal by cation exchange resin device, obtains silicic acid sol, then adds dehydrated alcohol, Methyltriethoxysilane, boric acid and hydrochloric acid solution are mixed, and the overall molar ratio of industrial water glass, deionized water, hydrochloric acid, boric acid, absolute ethanol and methyltriethoxysilane is 1:10:0.1:0.1: 10:1. After uniform mixing, measure the pH value of the mixed solution at this time to be 1.8, and let it stand for 1 hour. The amount of ammonia added is 25% of the molar weight of water glass, which is diluted and slowly added to the mixed sol, stirred while adding, and the amount of ammonia added is controlled by a flow rate meter. After the gel reaction occurs, follow-up treatment is carried out according to the process of process 2. Put th...

Embodiment 3

[0061] Take the modulus as 3.2, SiO 2 Content is 2842g of water glass of 72.14%, and with water glass, deionized water according to the ratio that molar ratio is 1:30, mixes evenly, carries out ion removal by cation exchange resin device, obtains silicic acid sol, then adds dehydrated alcohol, Methyltriethoxysilane, boric acid and hydrochloric acid solution are mixed, and the overall molar ratio of industrial water glass, deionized water, hydrochloric acid, boric acid, absolute ethanol and methyltriethoxysilane is 1:30:0.01:0.5: 30:0.5. After uniform mixing, measure the pH value of the mixed solution at this time to be 3.6, and let it stand for 1 hour. The add-on of ammonia water is 16.8% of the molar weight of water glass, it is slowly added in the mixed sol after diluting, stirs while adding, controls the add-on of ammonia water by flow velocity meter. After the gel reaction occurs, process 1 is used to carry out subsequent treatment on the gel. Extrude the gel into the m...

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Abstract

Provided is a method for continuously preparing boron-doped SiO2 aerogel. The device is arranged in layers and comprises: a raw material supply layer for supplying water glass, an organic silicon source, boron compounds, deionized water, inorganic acid, a surface modifier, a gel regulator and organic solvents; a gel preparation layer for mixing raw materials, forming gel and generating gel; an exchange layer for exchanging solvents for the gel; a drying layer for obtaining aerogel by using a common-pressure drying process; and a recycling layer for recycling waste organic solvents and waste steam. The aerogel process is continuous due the use of common-pressure drying. The prepared boron-doped silicon dioxide aerogel has a great mechanical strength, good light transmittance performance, a low thermal expansion coefficient and a high thermal stability.

Description

technical field [0001] The invention belongs to the field of preparation of novel inorganic porous materials, in particular to a method for continuously preparing boron-doped SiO with high mechanical strength, low thermal expansion coefficient, high light transmission performance and high thermal stability. 2 Airgel method. Background technique [0002] SiO 2 Airgel is a typical three-dimensional network structure nanomaterial with large specific surface area, high porosity, low density, low thermal conductivity and good dielectric properties. Its unique nanostructure makes it have broad application prospects in the fields of thermal insulation, energy saving, catalytic carrier, oil pollution adsorption and aerospace. [0003] Existing SiO 2 Airgel production mostly uses organosilicon (tetraethyl orthosilicate, methyl orthosilicate) as raw materials, and is dried and produced under supercritical conditions. For example, the production process of airgel has been disclosed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2006/10
Inventor 李蒙蒙陈晓星余永禄刘晓明
Owner CANEW TECH SHENZHEN CO LTD
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