Method and apparatus for manufacturing aerogel sheet

A method for manufacturing an aerogel sheet, the method comprising:

• a step (a) of preparing silica sol;
• a step (h) of preparing a gelling catalyst;
• a step (c) of injecting the silica sol, which is prepared in the step (a), to a surface of a blanket disposed on a conveyor belt to impregnate the blanket with the silica sol, wherein the conveyor belt comprises a first scraper for adjusting a thickness of the silica sol injected to the surface of the blanket;
• a step (d) of injecting the gelling catalyst, which is prepared in the step (b), to the surface of the blanket, into which the silica sol is impregnated, to gelate the silica sol, wherein the conveyor belt comprises a second scraper adjusting a thickness of the gelling catalyst injected to the surface of the blanket;
• a step (e) of aging, the blanket in which the silica sol is gelated;
• a step (f) of injecting a coating solution to the aged blanket to modify a surface of the blanket, wherein the coating solution is prepared by mixing ethanol with ammonia water (NH4OH);
• the first scraper and the second scraper may have the same shape and be installed to be adjustable in height on a top surface of the conveyor belt to uniformly adjust the thickness of each of the silica sol and the gelling catalyst,
• wherein, in the step (d), the gelling catalyst is injected to the surface of the blanket 10 at a rate of 0.035 L/min to 0.012 L/min to leave the gelling catalyst for a time of 8 minutes to 12 minutes and thereby to gelate the silica sol.