Device and method for preparing silicon dioxide aerogel felt and silicon dioxide aerogel felt

Abstract

The invention relates to a device and method for preparing a silicon dioxide aerogel felt and the silicon dioxide aerogel felt. The device comprises a gum dipping tank, and the gum dipping tank is provided with a compression roller; the liquid collecting tank is arranged on one side of the gum dipping tank, and the winding roller group is arranged above the liquid collecting tank; the drainage drying box is arranged above the liquid collecting tank, a felt inlet and a felt outlet are formed in the drainage drying box, and a tensioning mechanism and a drying assembly are arranged in the drainage drying box; the tensioning mechanism comprises a tensioning roller set, and the tensioning roller set is used for tensioning the gel felt located between the felt inlet and the felt outlet; the drying assembly comprises an air injection assembly communicated with the air inlet pipe, the air injection assembly comprises an air distribution row and a plurality of hot air knives communicated with the air distribution row, air outlets of the hot air knives are aligned with the tensioning gel felt, and the air injection assembly is used for injecting preheated nitrogen and a gas-phase hydrophobization reagent to the fiber felt body; an exhaust hole for exhausting gas is reserved in the hydrophobic drying box; therefore, hydrophobic and drying treatment of the silicon dioxide wet gel felt is achieved, and it is guaranteed that the formed hydrophobic silicon dioxide aerogel felt has high quality.

Description

technical field [0001] The invention belongs to the technical field of aerogel felt preparation, and particularly relates to a device and method for preparing a silica aerogel felt and a silica aerogel felt. Background technique [0002] Aerogel is a kind of gel material whose dispersion medium is gas, the interior is a highly cross-linked continuous three-dimensional network nano-hollow structure, and has a large specific surface area (500-1300m2). 2 / g), low density (30-150Kg / m 3 ), high porosity (85%-99%), small average pore size (2-50nm), and lower thermal conductivity (0.01-0.02W / m·K) than room temperature air. It is currently recognized as the solid material with the lowest thermal conductivity. Among them, silica aerogel and its felt have unique physical and chemical properties, and have achieved extensive research and application in aerospace, chemical industry, energy-saving buildings, thermal insulation, catalyst carriers, optics, acoustics, etc. [0003] The ex...

AI Technical Summary

Problems solved by technology

Although this method can obtain a hydrophobized silica airgel felt, it involves multiple solvent replacements in actual production, the reaction cycle is long, and the production cost is increased, and the gel is hydrophobized by self-infiltration. Modification treatment, resulting in uneven hydrophobization of the gel and low efficiency

Images