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A kind of preparation method of airgel and its application

A technology of airgel and wet gel, which is applied in the field of preparation of inorganic nanomaterials, can solve the problems of unsatisfactory product drying process, long production cycle, complicated process, etc., and achieve large-scale industrial production, short production cycle, The effect of short process flow

Active Publication Date: 2021-12-24
徐州绿肯环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution has problems such as long production cycle, complex process and high cost
[0009] To sum up, the sol-gel method of the prior art has a relatively complicated process, and requires extremely high costs and a long production cycle, which leads to the preparation of silica airgel products, regardless of the selection of raw materials and the utilization of by-products, or the production of products. The drying process is still unsatisfactory, therefore, it is necessary to develop a new method to prepare silica airgel with better physical properties through a simpler process

Method used

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  • A kind of preparation method of airgel and its application

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preparation example Construction

[0034] Such as figure 1 A kind of preparation method of airgel shown, comprises the following steps:

[0035] (1) Prepare a mixed solution with alkoxysilane, alkoxy alcohol, deionized water and modifier to obtain silica sol;

[0036] (2) Prepare silica wet gel with silica sol as raw material;

[0037] (3) Aged silica wet gel;

[0038] (4) A two-step drying method in which supercritical drying is combined with atmospheric pressure drying is used to dry the silica wet gel;

[0039] (5) reclaim alkoxy alcohol.

[0040] Wherein, in step (1), alkoxysilane, alkoxy alcohol, deionized water and modifier are mixed according to the molar ratio of 1: (2-40): (4-25): (0.1-10) Prepare a mixed solution, preferably, alkoxysilane, alkoxy alcohol, deionized water and modifier are prepared as a mixed solution according to the molar ratio of 1:(6~18):(4~12):(0.5~9) solution; gradually add an acidic catalyst to the above mixed solution, adjust the pH value to 2.5-5.5, preferably adjust the pH ...

Embodiment 1

[0055] Prepare a solution by mixing tetraethoxysilane, ethanol, deionized water and trimethylchlorosilane in a specific molar ratio, and the molar ratio of tetraethoxysilane, ethanol, deionized water and trimethylchlorosilane is 1 : 8: 4: 0.5, stir for 20 minutes to mix evenly, keep stirring, then add acid catalyst hydrochloric acid drop by drop, adjust the pH value to 4, adjust the temperature to 50°C, and continue stirring for 40 minutes to fully hydrolyze tetraethoxysilane to obtain Silica sol, then keep the temperature at 40°C, let it stand for 120 minutes, then add an appropriate amount of alkaline catalyst ammonia water drop by drop while stirring, adjust the pH value of the silica sol to 7, and then let it stand for 40 minutes to make the silica sol gel and form Silica wet gel; after the wet gel is formed, slowly add aging solution along the wall of the device to soak the wet gel in it, seal it at 60°C, let it stand for aging for 100 hours, and obtain a silica wet gel wi...

Embodiment 2

[0058] Mix trimethoxysilane, methanol, deionized water and dimethyldimethoxysilane according to a specific molar ratio to prepare a solution. The molar ratio is 1:2:25:10, stir for 40 minutes to mix evenly, keep stirring, and then add the acidic catalyst CH dropwise 3 COOH, adjust the pH value to 5.5, adjust the temperature to 80°C, and keep stirring for 10 minutes to fully hydrolyze the trialkoxysilane to obtain silica sol, then keep the temperature at 50°C, let it stand for 60 minutes, and then add an appropriate amount of alkali drop by drop while stirring Catalyst KOH, adjust the pH value of the silica sol to 6, and then let it stand for 50 minutes to gel the silica sol and form a silica wet gel; after forming the wet gel, slowly add aging solution along the wall of the vessel to make The wet gel is soaked in it, sealed and aged for 60 hours at 30°C to obtain a silica wet gel with a more complete structure.

[0059] Transfer the above-mentioned silica wet gel to a supercr...

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Abstract

The invention discloses a preparation method and application of an airgel. Alkoxysilane is used as a raw material, which is hydrolyzed to form a sol, which is then modified and aged, and prepared through supercritical drying and normal pressure drying steps to obtain aerogel Silica airgel products, after hydrolysis by-product alkoxy alcohols are recovered, are recycled for the preparation of alkoxysilanes; the aerogels prepared by the method are used to prepare airgel composite fiber mats, airgel panels, Application in airgel glass and airgel ball raw materials. Adopting the technical scheme of the present invention, the preparation method is simple, the overall reaction is stable, the controllability is strong, the investment cost is low, the production cycle is short, and the process technology can realize continuous production, which is friendly to the environment; the prepared silicon dioxide gas condensation Rubber products have excellent thermal insulation performance and heat resistance performance, and have high processing performance.

Description

[0001] technology field` [0002] The invention belongs to the technical field of preparation of inorganic nanometer materials, and in particular relates to a preparation method and application of an airgel. Background technique [0003] Silica airgel is a typical three-dimensional nanoporous material, composed of more than 95% air and less than 5% Si skeleton, with an average pore size of 20-50nm and a very high specific surface area of ​​500-1200m 2 / g, very low density 0.003~0.10g / cm 3 And extremely low thermal conductivity 0.011 ~ 0.021W / m·K (at room temperature). High-purity silica airgel is widely used in the preparation of Cherenkov detectors, special optical equipment, supercapacitors, sound-absorbing and sound-absorbing materials, and drug carriers. However, due to its poor mechanical properties and the presence of -OH groups on the surface are hydrophilic When used in the thermal insulation market, silica airgel powder and particles need to be made, and then mixed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/158C01B33/152C07F7/02C07F7/04
CPCC01B33/1585C01B33/152C07F7/025C01P2006/32
Inventor 张建立佟峰蒋立民
Owner 徐州绿肯环保科技有限公司
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