Production process of nano porous material with high temperature resistance

Abstract

The invention discloses a production process of a nano-porous material with high-temperature resistance, and relates to the field of materials. The production process comprises the steps: adding deionized water and absolute ethyl alcohol into a three-neck flask provided with a stirrer and a constant-pressure dropping funnel, adding a dispersing agent, stirring until the dispersing agent is completely dissolved to obtain a mixed solution A, adding aluminum chloride, stirring continuously to obtain a mixed solution B, adding tetraethyl orthosilicate, continuously stirring to obtain a mixed solution C, adding a gel accelerator into the mixed solution C, then adding reinforced fibers and continuing to stir and disperse to obtain gel D, aging the gel D, then placing the aged gel D in absolute ethyl alcohol for replacement to obtain gel E, and drying the gel E through a supercritical drying process. According to the production process, aluminum chloride is used as an aluminum source, tetraethyl orthosilicateis used as a silicon source, the nano-porous material which is good in high temperature resistance and good in mechanical property is prepared through sol-gel and supercritical drying processes, healthy and rapid development of the aerogel industry is promoted, and positive significance is achieved.

Description

technical field [0001] The invention relates to the field of materials, in particular to a production process of a nanoporous material with high temperature resistance. Background technique [0002] At present, airgel products on the market are basically made of silicon oxide, and their long-term working temperature is below 600°C, which cannot be applied to high-temperature environments. For high-temperature use scenarios such as ceramic kilns and metallurgical furnaces, the process temperature is generally 800°C. ℃, the highest can reach 1700 ℃ or even 2000 ℃, but at present, these high-temperature furnaces use insulation bricks, insulation cotton / fiber, amorphous castables, etc. for high-temperature insulation and heat insulation. Quality, mullite, zirconium, zircon, magnesia, etc., although it can meet various high-temperature insulation needs, but generally has high thermal conductivity, poor thermal shock resistance, and short service life. For example, the material w...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a production process of nanoporous materials with high temperature resistance: by adding deionized water and absolute ethanol to a three-necked flask equipped with a stirrer and a constant pressure dropping funnel Afterwards, add the dispersant and stir until it is completely dissolved to obtain a mixed solution A. Add aluminum chloride to the mixed solution A and continue to stir until it is completely dissolved to obtain a mixed solution B. Add tetraethyl orthosilicate dropwise while stirring Add it to the mixed solution B, continue to stir after the dropwise addition, to obtain the mixed solution C, add the gel accelerator to the mixed solution C, then add the reinforcing fiber and continue to stir and disperse to obtain the gel D, and age the gel D, Then place it in absolute ethanol for replacement to obtain gel E, and dry the gel E through a supercritical drying process to obtain the nanoporous material with high temperature resistance, which solves the problem of poor high temperature resistance of existing airgel products, The thermal insulation performance is poor and the process is complicated, so it is difficult to realize the problem of industrial production