Cheap and efficient preparation method of hydrophobic silica aerogel

A technology of silica and hydrophobization, which is applied in the direction of chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of high cost and long cycle, achieve low price, reduce production cost, and speed up the effect of hydrophobization process

Active Publication Date: 2019-12-20
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the purpose of the present invention is to provide a cheap and efficient preparation method of hydrophobized silica airgel, which overcomes the problems of high cost and long period of traditional hydrophobization process

Method used

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  • Cheap and efficient preparation method of hydrophobic silica aerogel
  • Cheap and efficient preparation method of hydrophobic silica aerogel
  • Cheap and efficient preparation method of hydrophobic silica aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A cheap and efficient preparation method of hydrophobized silica airgel:

[0020] (1) Mix ethyl orthosilicate, absolute ethanol and water evenly, and then add 2 mol / L NH 4 F solution and 0.2moL / L ammonia water were stirred evenly to obtain a silica sol, and then aged at 30°C for 24 h to obtain a silica gel; wherein, in terms of molar ratio, ethyl orthosilicate: no Water ethanol: water = 1: 12: 4; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: ethyl orthosilicate = 0.008: 1, the amount of ammonia added is guaranteed to be calculated in molar ratio, NH 3 : tetraethyl orthosilicate = 0.01: 1;

[0021] (2) Put the silica gel in the modification solution for modification treatment for 16 h, then perform solvent replacement with absolute ethanol for 2 times, each replacement time is 24 h, and finally perform supercritical drying treatment to obtain Hydrophobic silica airgel; wherein, the modified liquid is a mixed liquid composed of absolute eth...

Embodiment 2

[0024] A cheap and efficient preparation method of hydrophobized silica airgel:

[0025] (1) Mix ethyl orthosilicate, absolute ethanol and water evenly, and then add 2 mol / L NH 4 F solution and 0.2moL / L ammonia water were stirred evenly to obtain a silica sol, and then aged at 60°C for 8 h to obtain a silica gel; wherein, in terms of molar ratio, ethyl orthosilicate: no Water ethanol: water = 1: 10: 3; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: tetraethyl orthosilicate = 0.01:1, the amount of ammonia added is guaranteed to be calculated in molar ratio, NH 3 : ethyl orthosilicate = 0.015: 1;

[0026] (2) Put the silica gel in the modification solution for modification treatment for 12 hours, then perform solvent replacement with absolute ethanol for 3 times, each replacement time is 12 hours, and finally supercritical drying treatment, that is, Hydrophobic silica airgel; wherein, the modified liquid is a mixed liquid composed of absolute ethan...

Embodiment 3

[0029] A cheap and efficient preparation method of hydrophobized silica airgel:

[0030] (1) Mix ethyl orthosilicate, absolute ethanol and water evenly, and then add 2 mol / L NH 4 F solution and 0.2moL / L ammonia water were stirred evenly to obtain a silica sol, and then aged at 50°C for 20 h to obtain a silica gel; wherein, in terms of molar ratio, ethyl orthosilicate: no Water ethanol: water = 1:8:3; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: tetraethyl orthosilicate = 0.006: 1, the amount of ammonia added is guaranteed to be calculated in molar ratio, NH 3 : ethyl orthosilicate = 0.012: 1;

[0031] (2) Put the silica gel in the modification solution for modification treatment for 8 h, then perform solvent replacement with absolute ethanol for 2 times, each replacement time is 20 h, and finally supercritical drying treatment, that is, Hydrophobic silica airgel; wherein, the modified liquid is a mixed liquid composed of absolute ethanol, hydro...

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Abstract

The invention belongs to the technical field of aerogel preparation, and discloses a cheap and efficient preparation method of a hydrophobic silica aerogel. A silica gel is first prepared by using a sol-gel method, and then placed in a modified solution for modification treatment for 8-16 h, then solvent replacement is carried out by using anhydrous ethanol, and finally drying treatment is carriedout to obtain the hydrophobic silica aerogel, wherein the modified solution is a mixed solution composed of anhydrous ethanol, hydroxyl silicone oil, and an alkaline catalyst according to a molar ratio of 1:(0.02-0.1):(0.0005-0.0008), and the alkaline catalyst is triethylenetetramine, diethylenetriamine, ethylenediamine, tetraethylenepentamine or sodium hydroxide. The method uses the low molecular weight hydroxyl silicone oil as a hydrophobic agent to prepare the silica aerogel, the production cost of the aerogel is reduced, and a production cycle is shortened. The hydrophobic aerogel prepared by the method has the advantages of simple process, low cost, and relatively good hydrophobic effects.

Description

technical field [0001] The invention belongs to the technical field of airgel preparation, and in particular relates to a cheap and efficient preparation method of hydrophobized silica airgel. Background technique [0002] Airgel is a kind of gel material whose dispersion medium is gas, and the interior is a highly cross-linked continuous three-dimensional network nano-hollow structure with a large specific surface area (500-1300 m 2 / g), low density (30-150 Kg / m 3 ), high porosity (85%-99%), small average pore size (2-50 nm), and lower thermal conductivity (0.01-0.02 W / m K) than air at room temperature, etc., are currently recognized thermal The solid material with the lowest conductivity is mainly used in aerospace, chemical engineering, energy-saving buildings, heat insulation, catalyst carrier, optics, acoustics, etc. [0003] The raw materials for preparing silica airgel usually include water glass, orthosilicate, silica sol, etc. In order to improve the product’s hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01B33/159
CPCC01B33/1585C01B33/159
Inventor 刘喜宗张继承姚栋嘉郭金建李静陈帅王红伟何凤霞董会娜
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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