Method for preparing aerogel composite thermal insulation felt through normal pressure drying

A technology of atmospheric pressure drying and composite heat preservation, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of cumbersome graded replacement process, sodium salt impurity residue, energy waste, etc., to reduce the process flow and reduce organic Solvent loss, cost reduction effect

Inactive Publication Date: 2018-12-18
QINGDAO CREEK NEW ENVIRONMENTAL PROTECTION MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process uses cheap water glass as a raw material, it does not provide a treatment process for the impurity sodium salt existing in the water glass, which will cause a large amount of sodium salt impurities. In order to remove the remaining high surface tension water and wash away other residues at the same time acid, the process adopts a cumbersome graded replacement process, which causes a lot of energy waste and takes a long time

Method used

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  • Method for preparing aerogel composite thermal insulation felt through normal pressure drying
  • Method for preparing aerogel composite thermal insulation felt through normal pressure drying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Place 45m long, 1.2m wide, and 10mm thick glass fiber mats in the form of rolls in a suitable container, take water glass and deionized water and mix them uniformly at a volume ratio of 1:2 to obtain a silicon-containing solution, and mix the silicon-containing solution with Add ethanol and 1 mol / L sulfuric acid solution into a stirring tank at a volume ratio of 3:1:2 and mix evenly. After stirring for 30 min, pour the sol into a container where glass fiber felt is placed, and keep it warm at 40°C for 6 hours until it gels. After gelling, put the glass fiber mat and gel complex as a whole into the acid alcoholization solution, the amount of the acid alcoholization solution is at least less than the glass fiber mat and the gel complex as a whole, keep warm at 60°C, and the acid alcoholization solution is mixed with 40% sulfuric acid solution Prepare with absolute ethanol at a volume ratio of 1:8. After 6 hours, put the glass fiber mat and gel composite into a mixed soluti...

Embodiment 2

[0063] Place 45m long, 1.5m wide, and 10mm thick glass fiber mats in the form of rolls in a suitable container, take water glass and deionized water and mix them uniformly at a volume ratio of 1:1 to obtain a silicon-containing solution, and mix the silicon-containing solution with Add ethanol and 1 mol / L sulfuric acid solution into a stirring tank at a volume ratio of 1:1:1 and mix evenly. After stirring for 30 min, pour the sol into a container with glass fiber mats and keep it warm at 60°C for 6 h until it gels. After gelling, put the glass fiber mat and gel complex as a whole into the acid alcoholization solution, the amount of the acid alcoholization solution is at least less than the glass fiber mat and the gel complex as a whole, keep warm at 60°C, and the acid alcoholization solution is mixed with 40% sulfuric acid solution Prepare with absolute ethanol at a volume ratio of 1:4. After 6 hours, put the glass fiber mat and gel composite into a mixed solution containing he...

Embodiment 3

[0065] Place a 45m long, 1.5m wide, 10mm thick glass fiber mat in the form of a roll in a suitable container, take tetraethyl orthosilicate and deionized water and mix them uniformly at a volume ratio of 1:1 to obtain a silicon-containing solution. Add the silicon-containing solution, ethanol, and 1 mol / L sulfuric acid solution into the mixing tank at a volume ratio of 1:1:1 and mix evenly. After stirring for 30 minutes, pour the sol into the container where the glass fiber mat is placed, and keep it warm at 60°C for 6 hours. glue. After gelling, put the glass fiber mat and gel complex as a whole into the acid alcoholization solution, the amount of the acid alcoholization solution is at least less than the glass fiber mat and the gel complex as a whole, keep warm at 60°C, and the acid alcoholization solution is mixed with 40% sulfuric acid solution Prepare with absolute ethanol at a volume ratio of 1:4. After 6 hours, put the glass fiber mat and gel composite into a mixed solu...

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Abstract

The invention relates to a method for preparing an aerogel composite thermal insulation felt through normal pressure drying. The specific steps comprise: uniformly mixing a silicon source and deionized water to obtain a silicon-containing solution, uniformly mixing the silicon-containing solution, ethanol and an acidic catalyst, and stirring to obtain a sol; placing a composite material in a container, injecting the sol into the container loaded with the composite material, heating, and carrying out thermal insulation so as to wait gelation; placing the gel composite body obtained after the gelation into an acid alcoholization solution obtained by mixing anhydrous ethanol and sulfuric acid, heating, and carrying out thermal insulation; placing the gel composite body into a modified solution obtained by mixing a hydrophobic modifier and a solvent; and carrying out normal pressure drying on the modified gel composite body to obtain the aerogel composite thermal insulation felt material.According to the present invention, the technical scheme has advantages of low cost, less steps, less gel impurities, less energy consumption, simple equipment operation, and simple equipment maintenance.

Description

technical field [0001] The invention relates to the field of thermal insulation materials for industrial buildings, in particular to a method for preparing an airgel composite thermal insulation felt by drying under normal pressure. Background technique [0002] Airgel is a solid form of matter, one of the smallest solids in the world. The density is 3 kilograms per cubic meter. The common airgel is silica airgel, which was first made by American scientist Kistler. There are many types of aerogels, including silicon-based, carbon-based, sulfur-based, metal oxide-based, metal-based and so on. As long as the gel of any substance can be dried to remove the internal solvent, and can basically keep its shape unchanged, and the product has high porosity and low density, it can be called an aerogel. [0003] Porous materials mainly have solid phase, gas phase and thermal radiation heat transfer methods. As a typical porous material, SiO 2 Most of the space inside the airgel is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C01B33/158C04B111/40
CPCC01B33/158C04B30/02C04B2111/40C04B2201/20C04B2201/32C04B14/42
Inventor 翟传伟李壮贤刘建波刘静
Owner QINGDAO CREEK NEW ENVIRONMENTAL PROTECTION MATERIAL
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