Preparation Method of Aluminum Silicate Fiber-Reinforced Aerogel Felt and Impregnation Reactor

A preparation method of an aluminum silicate fiber-reinforced aerogel felt, comprising the following steps:

• (1) mixing orthosilicate, ethanol, and water evenly, adding an NH4F solution and ammonia water successively, and stirring evenly to obtain a silica sol;
• wherein the orthosilicate, the ethanol, and water have a molar ratio of 1:(4-12):(2-4);
• the NH4F solution is added with a molar ratio of NH4F and the orthosilicate at (0.002-0.01):1;
• and the ammonia water is added with a molar ratio of NH3 and the orthosilicate at (0.005-0.015):1;
• (2) winding an aluminum silicate fiber felt into a roll and mounting on a rotatable central shaft of a impregnation reaction kettle;
• wherein the central shaft is parallel to the ground and rotatable, and a plurality of injection holes are equidistantly provided on a surface of the reaction kettle;
• during impregnation, the central shaft of the reaction kettle drives the aluminum silicate fiber felt to rotate and slowly inject the silica sol obtained in step (1) is slowly injected into the surface of the fiber felt through the injection holes to conduct the impregnation;
• (3) allowing the fiber felt-gel composite obtained after being subjected to the impregnation in step (2) to stand to conduct aging at 30° C. to 60° C. for 8 h to 24 h;
• (4) placing the fiber felt-gel composite obtained in step (3) in absolute ethanol to conduct solvent replacement multiple times to remove excess water in the fiber felt-gel composite;
• and
• (5) drying the fiber felt-gel composite obtained in step (4) to obtain the aluminum silicate fiber-reinforced aerogel felt.