PROCESS FOR THE PREPARATION OF HYDROPHOBIC AGENTS

• Main Authors: ROTH, MICHAEL, GOGOLOK, KONRAD
• Format: Patent
• Language: English; French
• Published: 06.01.1981
• Subjects: ADHESIVES; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DYES; LIME, MAGNESIA; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

A process is provided for preparing hydrophobic agents which may be combined with inorganic binding agents prior to molding. The process involves slaking caustic lime with an organopolysiloxane and water in which at least one mol of water is present for each mol of CaO, the organopolysiloxane in the emulsion having an average of from 0.8 to 1.8 SiC-bonded hydrocarbon radicals selected from the group consisting of alkyl radicals having from 1 to 16 carbon atoms and phenyl in the presence of a protective colloid and thereafter dried, the improvement which comprises: adding to the above mixture at least one alkyl metal salt of an acid having the formula R(O)aSO3H in which R is a monovalent hydrocarbon radical having up to 50 carbon atoms and which may also contain oxygen and nitrogen atoms and a is 0 to 1. The agents can be added to the inorganic binding agents at any time and can be uniformly dispersed without danger of demulsification. While they are easily wetted with water, the molded objects or coatings have a great degree of water repellency.