A method for improving the dispersion of silica airgel in aqueous phase by atomization adsorption

Abstract

The invention discloses a method for improving silicon dioxide aerogel water phase dispersibility through atomization absorption. The method comprises the following steps of fining and sieving silicon dioxide aerogel powder to obtain refined aerogel; atomizing organic solvents with the density being greater than the density of the water; forming a film coating reagent in a sealed container; uniformly dispersing the refined aerogel into a sealed container to form powder fog; adsorbing the film coating reagent by the powder fog to obtain coated aerogel; charging dispersing agent water solution into the bottom of a sealed container, wherein the sealed container is provided with a stirring device and an air blowing device; after the coated aerogel sinks down to the surface of the dispersing agent water solution, stirring and dispersing the coated aerogel with the density being greater than or equal to the density of the water into the water solution; blowing up the coated aerogel with the density being smaller than the density of water so that the coated aerogel is in contact with the film coating reagent again for adsorption. The method for improving silicon dioxide aerogel water phase dispersibility through atomization absorption provided by the invention has the advantages that the inherent structure and characteristics of the silicon dioxide aerogel are remained; the stable dispersion of the silicon dioxide aerogel in the water phase is realized; the work procedures are simple; the cost is low.

Description

technical field [0001] The invention relates to the technical field of hydrophobic silica aerogels, in particular to a method for improving the dispersibility of the silica airgel by atomization adsorption. Background technique [0002] Silica airgel has good thermal insulation properties. Compared with traditional inorganic thermal insulation materials and organic thermal insulation materials in the field of building energy-saving thermal insulation, airgel has more obvious advantages in civil thermal insulation materials, especially external wall thermal insulation. Silica airgel has a nanoporous and three-dimensional network skeleton structure, and has the advantages of low density, small pore size, high porosity, large specific surface area, and low thermal conductivity. Moreover, cheap water glass, rice husk ash, etc. can be used as raw materials for preparation, and the preparation cost is low. Silica aerogels are gradually being used in building envelopes, coatings a...

AI Technical Summary

Problems solved by technology

Silica aerogels are gradually being used in building envelope structures, coatings and concrete. However, due to the strong hydrophobicity of the airgel surface, the water contact angle is 140-150°, and the density is very small, about 0.02-0.25g / mL, it is difficult to achieve uniform dispersion in aqueous phase materials

However, in commonly used construction materials, such as the doping and use process of airgel in water-based paint, composite materials or chemical methods will increase the production cost and complexity of the process, and even destroy the inherent structure and characteristics of the airgel itself , and the introduction of organic moieties will reduce the combustion performance of airgel materials and increase their fire hazards