Process for preparing structural components

US4394335A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Michael Roth
• Volker Frey · Burghausen, DE

Key dates

• Filing date: Nov 12, 1981
• Grant date: Jul 19, 1983
• Expiry date: Nov 12, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B24/42
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This invention relates to a process for preparing structural components which comprises preparing a slurry containing a hydraulic binding agent, water, additives and an organo(poly)siloxane of the general formula ##EQU1## 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 carbon 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, molding the slurry and thereafter exposing the molded slurry to aqueous steam.