Process for preparing structural components

Details Process for preparing structural components Process for preparing structural components

C - Chemistry, Metallurgy

04

B

261/50

C04B 24/42 (2006.01)

Patent

CA 1162204

ABSTRACT OF THE DISCLOSURE A process is provided herein for preparing structural components. The process includes first forming a slurry containing a hydraulic binding agent, water, additives and an organo(poly)siloxane of the general formula Image where at least 10 percent of the number of R radicals are the same or different alkyl radicals having at least 4 carbon atoms per radical and the other radicals when present are alkyl radicals having from 1 to 3 car- bon atoms per radical and/or phenyl radicals, R' represents the same or different alkyl radicals having from 1 to 4 carbon atoms per radical, x is 0, 1, 2 or 3, with an average of from 0.9 to 1.8, y is 0, 1, 2 or 3, with an average of 0.01 to 2.0 and z is 0, 1, 2 or 3, with an average of from 0.00 to 0.5, with the proviso that the sum of x + y + z may not exceed 3.5, preferably not more than 1.5. The slurry is then molded and, thereafter, the molded slurry is exposed to aqueous steam. With the same amount of organopolysiloxane, building blocks or structural components prepared as described above and bonded or hardened with the aid of aqueous steam, exhibit much improved hydrophobicity in which the hydrophobicity is more even distributed on the surface or within the structure of the building blocks or structural components. Moreover, the pores are better dis- tributed throughout the structural components and subsequent to bonding or hardening they can be more easily coated, for example with bitumen, than building blocks or structural components prepared heretofore containing silicone oil and then bonded or hardened with the aid of aqueous steam.

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