Preparation method of aluminum silicate fiber-reinforced aerogel felt and impregnation reactor

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

• (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 reaction kettle;
• wherein the central shaft is parallel to the ground and rotatable, and a plurality of injection holes are provided on a surface of the reaction kettle;
• rotating the central shaft to drive the aluminum silicate fiber felt to rotate, and injecting the silica sol into the reaction kettle through the plurality of injection holes to impregnate the aluminum silicate fiber felt, a fiber felt-gel composite being obtained after the aluminum silicate fiber felt being impregnated;
• (3) making the fiber felt-gel composite obtained in (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 (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 (4) to obtain the aluminum silicate fiber-reinforced aerogel felt.