Method of taking micro-emulsion as precursor to rapidly prepare aerogel

Abstract

The invention relates to a method of taking micro-emulsion as the precursor to rapidly prepare aerogel. The method comprises the following steps: step one, measuring a special water soluble silicon source to prepare a quantitative water solution, adding a certain amount of surfactant and co-surfactant, and fully dissolving the surfactant and co-surfactant; step two, measuring a special active organic silicon compound and an auxiliary oil phase, adding the active organic silicon compound and the oil phase into the water solution, and stirring the solution at a high speed for a while so as to form a semi-transparent, uniform, and stable mixed solution, namely micro-emulsion; step three, compounding the micro-emulsion with inorganic additives and fiber felts for a while so as to form a solid phase, and carrying out aging and normal pressure (or supercritical) drying to obtain a fiber felt compounded aerogel material. The preparation technology is novel, the raw material cost is low, the application range is wide, a normal pressure drying method can be used, a supercritical drying technology can also be used, the obtained material has an excellent thermal insulation performance, the structural strength is high, and the long-term shrinkage rate is small.

Description

technical field [0001] The invention relates to a method for preparing airgel and its composite material using microemulsion as a precursor, in particular to a method for rapidly preparing hydrophobic airgel and its composite material by completing surface hydrophobization modification in a microemulsion system method. Background technique [0002] Silica airgel is a new type of lightweight porous material composed of nano-scale particles aggregated with air as the dispersion medium. Its porosity rate is as high as 80-99%, and the typical size of the pores is 1-100 nanometers. It has the advantages of low thermal conductivity, low acoustic impedance, low refractive index and strong adsorption performance. Showing unique properties, it has broad application prospects in the fields of aerospace, military industry, communication, medical treatment, materials, electronics, metallurgy, and chemical industry. In 2007, the British "Times" praised silica airgel as "a magical mater...

AI Technical Summary

Problems solved by technology

The difference between this method and the aforementioned process of preparing airgel from inorganic silicon sources is that the microemulsion method is used to prepare wet gel, and the follow-up process is still a traditional cumbersome treatment method. The amount of organic solvent used in the washing and replacement process is large, and the surface Modification treatment, the whole process is longer

Images