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A Low-Surface Tension Solvent Directly Filled Airgel with Low Cost and Rapid Preparation

A low surface tension, gas-filled technology, applied in chemical instruments and methods, silicon dioxide, inorganic chemistry, etc., can solve the problems of high material cost and long preparation time, simplify the preparation process, reduce the amount of alcohol solvent, shorten the The effect of the preparation process cycle

Active Publication Date: 2018-07-31
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a low-surface-tension solvent direct filling airgel low-cost rapid preparation method to solve the problems of long preparation time and high material cost in the prior art

Method used

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  • A Low-Surface Tension Solvent Directly Filled Airgel with Low Cost and Rapid Preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the content of the present invention, the contriver makes airgel 1, concrete steps are as follows:

[0036] (1) Measure 50ml of tetraethyl orthosilicate at a temperature of 30°C, add 15ml of absolute ethanol to dilute, add 4ml of water, and adjust the pH value of the sol to 2 with a mass concentration of 1% hydrochloric acid, at a temperature of 40°C Leave for 2 hours.

[0037] (2) Then add 60ml of n-hexane, add 5ml of water, and then add ammonia water to adjust the pH value of the sol to 8, stir for 2 minutes to cast, and place at 30°C for 4 hours.

[0038] (3) The prepared wet gel was transferred to a mixture of trimethylchlorosilane and n-hexane with a volume ratio of 1:10, and soaked at 30°C for 8 hours.

[0039] (4) Next, the modified wet gel was transferred to n-hexane, and soaked at 30° C. for 20 minutes.

[0040] (5) Finally, place the cleaned gel in an oven at 70° C. for 8 hours at normal pressure, and in an oven at 200° C. for 2 hours to prepare...

Embodiment 2

[0043] According to the content of the present invention, the contriver makes airgel 2, concrete steps are as follows:

[0044] (1) Measure 50ml of tetraethyl orthosilicate at 30°C, add 15ml of absolute ethanol to dilute, add 4ml of water, and adjust the pH value of the sol to 2 with hydrochloric acid with a mass concentration of 1%. Set aside for 2 hours.

[0045] (2) Then add 50ml of n-hexane, add 3ml of water, and then add ammonia water to adjust the pH value of the sol to 8, stir for 2 minutes to cast the mold, and place it at 30°C for 4 hours.

[0046] (3) The prepared wet gel was transferred to a mixture of trimethylchlorosilane and n-hexane with a volume ratio of 1:10, and soaked at 30°C for 8 hours.

[0047] (4) Next, the modified wet gel was transferred to n-hexane, and soaked at 30° C. for 20 minutes.

[0048](5) Finally, place the cleaned gel in an oven at 70° C. for 8 hours and at 200° C. for 2 hours under normal pressure to prepare the aerogel.

[0049] SiO pre...

Embodiment 3

[0051] According to the content of the present invention, the contriver makes airgel 3, concrete steps are as follows:

[0052] (1) Measure 50ml of tetraethyl orthosilicate at 30°C, add 15ml of absolute ethanol to dilute, add 4ml of water, and adjust the pH value of the sol to 2 with hydrochloric acid with a mass concentration of 1%. Set aside for 2 hours.

[0053] (2) Then add 40ml of n-hexane, add 3ml of water, and then add ammonia water to adjust the pH value of the sol to 8, stir for 2 minutes to cast, and place at 30°C for 4 hours.

[0054] (3) The prepared wet gel was transferred to a mixture of trimethylchlorosilane and n-hexane with a volume ratio of 1:10, and soaked at 30°C for 8 hours.

[0055] (4) Next, the modified wet gel was transferred to n-hexane, and soaked at 30° C. for 20 minutes.

[0056] (5) Finally, place the cleaned gel in an oven at 70° C. for 10 hours and at 200° C. for 2 hours under normal pressure to prepare an airgel.

[0057] SiO prepared in thi...

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Abstract

The invention discloses a low-cost rapid preparation method of low-surface-tension solvent direct filling aerogel. The method includes the following steps of mixing and hydrolyzing a silicon source, alcohol solvent, water and an acid catalyst according to ratio, sequentially adding low-surface-tension solvent, water and a basic catalyst for gel standing, transferring wet gel to be soaked in mixed liquid of a hydrophobic reagent and a low-surface-tension solution, and conducting surface washing and normal-pressure drying to obtain the aerogel. The method has the advantages that the replacement and ageing of the alcohol solvent are not needed, normal-pressure drying is conducted after surface modification, production time is saved, and continuous large-scale production can be conducted; the low-surface-tension solvent is placed in gel, the reaction of the alcohol solvent and the hydrophobic reagent during surface modification is reduced, and material cost can be saved; the consumption of the hydrophobic reagent in the preparation process is reduced; the reagent can be recycled and is beneficial to green production; controllability is achieved in the preparation process, and high-performance aerogel with stable physical parameters can be easily obtained.

Description

technical field [0001] The invention relates to the technical field of airgel preparation, in particular to the preparation technology of directly filling airgel with a low surface tension solvent. Background technique [0002] Airgel, as a new type of lightweight super thermal insulation material with good thermal insulation performance, has a nanoporous structure with a controllable structure. Due to its unique nanostructure, it has unique properties such as low thermal conductivity, low density and high specific surface area. Performance, in which the thermal conductivity can be as low as 0.013W / (m K), and the high specific surface area is about 500-1200m 2 / g, and also has the characteristics of corrosion resistance and high temperature resistance, and is an excellent heat insulation material. [0003] SiO 2 The conventional method of airgel is to prepare by supercritical drying method, generally using organic solvents such as alcohols, or CO 2 As a drying medium, air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/16
CPCC01B33/16C01B33/163C01P2006/10C01P2006/12C01P2006/14C01P2006/16C01P2006/32
Inventor 吴会军钟支葵陈奇良周孝清
Owner GUANGZHOU UNIVERSITY
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