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Ultrasonic-assisted method for preparing hydrophobic silicon dioxide aerogel composite materials

A technology of hydrophobic silica and composite materials, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as high cost, unfavorable production and promotion, and achieve low cost, short preparation period, and controllable degree. high effect

Inactive Publication Date: 2017-06-09
ECONANO TECH LTD BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of this method is relatively high, which is not conducive to large-scale production and promotion.

Method used

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  • Ultrasonic-assisted method for preparing hydrophobic silicon dioxide aerogel composite materials
  • Ultrasonic-assisted method for preparing hydrophobic silicon dioxide aerogel composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for ultrasonically assisted preparation of hydrophobic silica airgel composites proposed by the present invention comprises the following steps:

[0029] S1, dilute the water glass with water, mix with acid solution and hydrolyze to obtain solution A;

[0030] S2, adding a basic catalyst to solution A, adjusting the pH value of the solution to 5, and obtaining solution B;

[0031] S3, adding the organic solvent into the solution B, stirring evenly and pouring it into a mold carrying a glass fiber mat to obtain a wet gel fiber mat;

[0032] S4, aging the wet gel fiber felt pad;

[0033] S5. Put the aged wet gel fiber mat in a container, add a silane modifier and an acid solution, then place the container in an ultrasonic generator for ultrasonic modification, and obtain the hydrophobic carbon dioxide after drying in an oven. Silicone airgel composite material, its relevant parameters are as follows: thermal conductivity is 0.0234W / (m K), hydrophobic angle is 1...

Embodiment 2

[0035] A method for ultrasonically assisted preparation of hydrophobic silica airgel composites proposed by the present invention comprises the following steps:

[0036] S1, dilute the water glass with water, mix with acid solution and hydrolyze to obtain solution A;

[0037] S2, adding a basic catalyst to solution A, adjusting the pH value of the solution to 3, and obtaining solution B;

[0038] S3, adding the organic solvent into the solution B, stirring evenly and pouring it into a mold carrying a glass fiber mat to obtain a wet gel fiber mat;

[0039] S4, aging the wet gel fiber felt pad;

[0040] S5. Put the aged wet gel fiber mat in a container, add a silane modifier and an acid solution, then place the container in an ultrasonic generator for ultrasonic modification, and obtain the hydrophobic carbon dioxide after drying in an oven. Silicone airgel composite material, its relevant parameters are as follows: thermal conductivity is 0.0237W / (m K), hydrophobic angle is 1...

Embodiment 3

[0042] A method for ultrasonically assisted preparation of hydrophobic silica airgel composites proposed by the present invention comprises the following steps:

[0043] S1. Dilute the water glass with water, and mix it with the acid solution for hydrolysis reaction to obtain solution A; wherein, the volume ratio of water glass and water is 1:1; during the mixed hydrolysis reaction, the temperature is 60°C, and the time is 10 minutes; The acid is hydrochloric acid, and the concentration of the acid solution is 12mol / L;

[0044] S2, adding a basic catalyst to the solution A, adjusting the pH value of the solution to 3 to obtain a solution B; wherein the basic catalyst is a sodium carbonate solution, and the concentration of the basic catalyst is 0.01mol / L;

[0045]S3, adding the organic solvent into the solution B, stirring evenly and then pouring it into a mold loaded with glass fiber felt to obtain a wet gel fiber felt pad; wherein, the organic solvent is ethanol, and the vol...

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Abstract

The invention discloses an ultrasonic-assisted method for preparing hydrophobic silicon dioxide aerogel composite materials. The ultrasonic-assisted method includes steps of diluting water glass by the aid of water and carrying out mixed hydrolysis reaction on the water glass and acid solution to obtain solution A; adding basic catalysts into the solution A, and regulating a pH (potential of hydrogen) value of the solution A until the pH value reaches 3-5 so as to obtain solution B; adding organic solvents into the solution B, uniformly stirring the organic solvents and the solution B to obtain mixtures and then pouring the mixtures into molds with glass fiber felt to obtain wet gel fiber felt pads; aging the wet gel fiber felt pads; placing the aged wet gel fiber felt pads in containers, adding silane modifiers and acid solution into the containers, placing the containers in ultrasonic generators, carrying out ultrasonic modification and carrying out oven drying to obtain the hydrophobic silicon dioxide aerogel composite materials. The ultrasonic-assisted method for preparing the hydrophobic silicon dioxide aerogel composite materials has the advantages of simple procedure, short cycle and low cost.

Description

technical field [0001] The invention relates to the technical field of thermal insulation and energy-saving materials, in particular to a method for ultrasonically assisted preparation of hydrophobic silica airgel composite materials. Background technique [0002] Silica airgel is a material with a unique nanoporous structure, and its internal three-dimensional network structure is randomly distributed. This special structure endows this material with excellent characteristics such as high porosity, high specific surface area, low density, multi-mesopority, and low thermal conductivity. Based on these excellent properties, silica airgel has received great attention and application in the fields of building sound insulation, catalyst carrier, especially thermal insulation. The large amount of mesoporous structure distributed inside the silica airgel prevents air from flowing freely inside, greatly reducing the heat exchange process. On the other hand, its criss-crossing thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/00C01B33/157C01B33/158
CPCC04B28/005C01B33/157C01B33/1585C04B2111/27C04B2111/40C04B2201/20C04B2201/32C04B14/42C04B38/0045
Inventor 潘月磊刘忠
Owner ECONANO TECH LTD BEIJING
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