Anti-fragmentation preparation method of monolithic aerogel glass

Abstract

The invention provides an anti-fragmentation preparation method of monolithic aerogel glass. The preparation method comprises the following steps: adding an organic solvent into polyvinyl alcohol, dispersing, and completely drying at a certain temperature; weighing a proper amount of dried polyvinyl alcohol, and dissolving the polyvinyl alcohol in a dimethyl sulfoxide aqueous solution at a high temperature; taking orthosilicate and deionized water as raw materials and concentrated hydrochloric acid as a catalyst, adjusting the pH value to 1-4, and standing at a constant temperature for a certain time to obtain silica sol; heating silica sol to a relatively high temperature, adding the silica sol into the dissolved polyvinyl alcohol while the silica sol is hot, uniformly stirring, and cooling to room temperature to form a prepolymer; putting the prepolymer into a low-temperature freezing chamber, carrying out freezing-unfreezing circulation for 3-7 times, and immersing the prepolymer into dimethyl sulfoxide containing a small amount of ammonia water until the prepolymer is completely transparent; and finally, carrying out supercritical drying or freeze drying to obtain the complete non-fragmentation aerogel glass. The transparent polyvinyl alcohol gel and the silicon dioxide gel form a network mutual insertion structure so that the framework strength of the silicon dioxide gel is enhanced, and the gel is prevented from being broken in the drying process.

Description

technical field [0001] The invention relates to the field of airgel preparation methods, in particular to an anti-shatter preparation method of monolithic airgel glass. Background technique [0002] Airgel is a three-dimensional network porous solid material composed of nanoparticle clusters with a porosity greater than 90%. Airgel has the characteristics of low density, low thermal conductivity, and high specific surface area, and has great application prospects in the fields of thermal insulation, catalyst carrier, and environmental purification. [0003] Airgel glass is an aerogel with high visible light transmittance, low shading coefficient and low heat transfer coefficient. It can be used for indoor lighting and building energy saving and heat preservation. Glass airgel has been applied in interior decoration. [0004] The Chinese patent whose patent publication number is CN212053366U discloses a method for installing a breathing airgel glass curtain wall. Airgel glas...

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent whose patent publication number is CN212053366U discloses a method for installing a breathing airgel glass curtain wall. Airgel glass is prepared by filling airgel powder in the glass interlayer, which realizes energy saving and heat preservation; the patent publication number is CN109987861A, Chinese patents such as CN108060874A, CN109989507A, etc. disclose a scheme for the preparation of airgel glass by filling airgel powder or particles in the insulating glass interlayer and encapsulating them, but the airgel glass prepared by this method has low light transmittance and intergranular Porosity leads to higher thermal conductivity and other defects

Among them, airgel-filled glass and airgel-coated glass have relatively poor light transmission and heat insulation properties.

Monolithic airgel glass has the best performance, but its structural mechanical properties are poor, and it is easy to break and crack