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Preparation method of elastic aerogel

An aerogel and elastic technology, applied in chemical instruments and methods, silica, inorganic chemistry, etc., can solve the problems of poor mechanical properties of products, complicated preparation process, small mass production, etc., and achieve good mechanical properties and preparation process. Easy and mass-produced effect

Inactive Publication Date: 2017-05-10
SHENZHEN AEROGEL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Airgel has the advantages of high temperature resistance and strong pressure resistance, and is often used in thermal insulation and fireproof materials by the people. However, it is used as a raw material to prepare products. The preparation process of the prior art is complicated, and the mass production is small, and the preparation is difficult. The product has poor mechanical properties and is fragile

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S1: Dissolve sodium lauryl sulfate in methanol and mix well, then add the mixed solution of ethyl orthosilicate and methyltrimethoxysilane drop by drop, and in the mixed solution, ethyl orthosilicate and methyltrimethoxysilane The molar volume ratio of oxysilane is 1:10 (and the molar ratio of ethyl orthosilicate to methanol is 1:20), stir evenly under the condition of 1500r / min, and then add the concentration of 0.01~0.5 under the condition of 30℃ mol / L of oxalic acid, and the amount of oxalic acid added makes the pH of the solution 2; stir at a stirring speed of 1100r / min to make it hydrolyze completely, and obtain a stable alcohol sol;

[0030] S2: Add ammonia water with a concentration of 1 to 10 mol / L dropwise into the alcohol sol prepared in step S1 under stirring, and add the amount of ammonia water so that the pH of the solution is 6, stir for 8 minutes, and age at 45°C for 12 to 72 hours. obtain a wet gel;

[0031] S3: Hydrophobically modify the wet gel obtain...

Embodiment 2

[0033] S1: Dissolve octylphenylpolyoxyethylene ether in methanol and mix evenly, then add the mixed solution of ethyl orthosilicate and methyltrimethoxysilane dropwise, and in the mixed solution, ethyl orthosilicate and methyl trimethoxysilane The molar volume ratio of trimethoxysilane is 1:5 (and the molar ratio of ethyl orthosilicate to methanol is 1:10), stir evenly under the condition of 500r / min, and then add the concentration of 0.01 ~0.5mol / L oxalic acid, and the amount of oxalic acid added makes the solution pH 3; Stir at 1500r / min stirring speed to make it completely hydrolyzed and obtain a stable alcohol sol;

[0034] S2: Add ammonia water with a concentration of 1 to 10 mol / L dropwise into the alcohol sol prepared in step S1 under stirring, and add the amount of ammonia water so that the pH of the solution is 7, stir for 20 minutes, and age at 75°C for 12 to 72 hours, obtain a wet gel;

[0035] S3: Hydrophobically modify the wet gel obtained in step S2 by mixing th...

Embodiment 3

[0037] S1: Dissolve polyethylene glycol 600 in methanol and mix well, then add the mixed solution of ethyl orthosilicate and methyltrimethoxysilane dropwise, and in the mixed solution, ethyl orthosilicate and methyltrimethoxysilane The molar volume ratio of base silane is 1:1 (and the molar ratio of ethyl orthosilicate to methanol is 1:1), stir evenly under the condition of 1000r / min, and then add the concentration of 0.01~0.5mol under the condition of 35℃ / L of oxalic acid, and the amount of oxalic acid added makes the pH of the solution 4; stir at a stirring speed of 1500r / min to make it hydrolyze completely, and obtain a stable alcohol sol;

[0038] S2: Add ammonia water with a concentration of 1 to 10 mol / L dropwise into the alcohol sol prepared in step S1 under stirring, and add the amount of ammonia water so that the pH of the solution is 5, stir for 14 minutes, and age at 100°C for 12 to 72 hours. obtain a wet gel;

[0039] S3: Hydrophobically modify the wet gel obtain...

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Abstract

The invention discloses a preparation method of elastic aerogel. The preparation method comprises the following steps: (S1) dissolving a surface modifier in methanol and mixing uniformly; dropwise adding a mixed solution of ethyl orthosilicate and methyl trimethoxy silane and stirring uniformly; and adding 0.01-0.5mol / L oxalic acid, and stirring till complete hydrolysis to obtain stable alcosol; (S2) dropwise adding 1-10mol / L ammonia water into the alcosol prepared in the step (S1), stirring and aging to obtain wet gel; and (S3) performing hydrophobic modification of the wet gel obtained in the step (S2) through the mixed solution, drying in a drying oven, and naturally cooling to obtain elastic aerosol. The preparation method disclosed by the invention has the following advantages: the whole preparation flow is easily controlled, elastic aerosol different in elasticity coefficient can be prepared according to the requirements, and mass production is promoted; and moreover, the specific surface area of the aerosol prepared by the method is 800-1,000m<2> / g, the density is 0.1-0.15g / cm<3>, the porosity is greater than or equal to 90%, the mechanical property is good, and the defect that aerogel is easily broken is improved.

Description

technical field [0001] The invention belongs to the technical field of airgel materials, in particular to a preparation method of elastic airgel. Background technique [0002] At present, due to the increasing attention to the fire protection of thermal insulation materials, the development of domestic thermal insulation materials is becoming more and more rapid. Airgel has the advantages of high temperature resistance and strong pressure resistance, and is often used by the people in thermal insulation and fireproof materials. However, it is used as a raw material to prepare products. The preparation process of the prior art is complicated, and the mass production is small, and the prepared The product has poor mechanical properties and is fragile. Contents of the invention [0003] In order to solve the above-mentioned technical defects, the present invention prepares a method for preparing an elastic airgel, so that the obtained product has elasticity, strong mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
CPCC01B33/163C01P2006/10C01P2006/12
Inventor 王天赋彭战军徐渊
Owner SHENZHEN AEROGEL TECH CO LTD
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