| 摘要 |
Fireproof sealbag provided with external cover made of fireproof fabric, preferably textile glass, in given case with internal cover made of damp-proof foil, filled with stuffing containing thermo-swelling pad with 25-45 volume % sand or granular fireproof material of similar specific weight, and 20-40 volume % perlite or other heat insulator as filling material, and 20-40 volume % sodium enriched and dried silicic acid gel grains as swelling pad. The stuffing may contain in given case 2-5 % betonite to improve the density and space filling. To the course of producing the swelling pad according to the invention, first silicic acid gel is prepared by mixing 60-80 % waterglass and 40-20 % gel-forming additive, e.g. sodium chloride or sodium carbonate, then the gel is dried and grains are formed. The grains can be prepared by crushing the dried gel, or in given case by granulation of the still liquid gel in air jet or by other means. |
