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Abstract

A preparation for the water-repellant impregnation of porous, mineral building materials on the basis of organosilicon compounds is disclosed. The preparation is an emulsion containing alkoxy groups and consist of an emulsion containing a) 5 to 45% by weight of an alkoxysilane of the general formula R.sup.1 --Si--(OR.sup.2).sub.3 wherein R.sup.1 is an alkyl group with 1 to 16 carbon atoms and R.sup.2 is an alkyl group with 1 to 4 carbon atoms, b) 45 to 5% by weight of a mixture consisting of b1) a silane of the general formula R.sup.3 --Si--(OR.sup.2).sub.3, wherein R.sub.3 is an aminoalkyl group with 1 to 6 carbon atoms or a group of the general formula H.sub.2 N--(CH.sub.2).sub.x R.sup.4 --(CH.sub.2).sub.y --, in which R.sup.4 represents oxygen, sulfur, --NH-- or --NH--CH.sub.2 --CH.sub.2 --NH group and x.gtoreq.2 and y.gtoreq., or a group of the general formula (R.sup.2 O).sub.3 Si--(CH.sub.2).sub.x --NH--(CH.sub.2).sub.x --, in which R.sup.2 and x are defined as above, ##STR1## and n is a whole number from 1 to 5, and b2) a polysiloxane of the general formula ##STR2## wherein R.sup.5 is a methyl or phenyl group, with the proviso that at least 90% of the R.sup.5 groups are methyl group and m=20 to 250, the ratio of b1) to b2) being such that more than 1 and up to 3 OR.sup.2 groups of compound b1) corresponds to one SiOH group of compound b2), c) between about 0.5 to 10% by weight of an O/W emulsifier or emulsifier mixture and d) about between 40 to 49.5% by weight of water. The preparations have a high depth of penetration and produce an excellent water-repellent effect. A method of impregnating building materials in a water repellent manner is also disclosed.

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