| abstract |
The insulating material, in particular the breathable fire-insulating material comprising water glass and polystyrene, is formed by an air-curable mixture which contains 1 to 32.4% by weight. of expanded polystyrene, 57.5 to 96.0 wt. of aqueous sodium silicate solution, 2 to 6 wt. of aluminum hydroxide and 0.1 to 0.5 wt. water glass stabilizer. A process for the production of an insulating material is described, in particular a process for the production of a breathable fire-retardant insulation material comprising water glass and polystyrene, according to which polystyrene beads are first mixed with an aqueous solution with a concentration of 25% by weight. carbon black so that their entire surface is coated with carbon black, aluminum hydroxide is added and the whole is mixed to form an insulating mixture, a water glass stabilizer is added to the aqueous sodium silicate solution and then a water glass hardener is added to this solution, followed by the solution is stirred for 1 to 10 minutes to form a binder solution, the insulating mixture is placed in the binder solution while stirring, and the whole is mixed, and the resulting mixture is poured at the application site. |