Preparation for the water-repellent impregnation of porous mineral building materials
First Claim
1. A composition for the impregnation of porous mineral building materials to protect such materials against penetration by water comprising an emulsion of 2.5 to 25% by weight of an alkoxysilane of the formula
whereinR1 is an alkyl group with 3 to 12 carbon atoms andR2 is a methyl or ethyl group,2 to 20% by weight of an alkoxysiloxane of the formula ##STR7## wherein R3 is an alkyl group with 1 to 6 carbon atomsa is 0.8 to 1.2 andb is 0.2 to 1.2,
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Abstract
A composition is disclosed which is useful for the water-repellent impregnation of porous mineral building materials. The composition is based on organosilicon compounds which contain alkoxy groups and comprises an emulsion which contains 2.5 to 25% by weight of an alkoxysilane of the formula
R.sup.1 -Si(OR.sup.2).sub.3
wherein
R1 is an alkyl group with 3 to 12 carbon atoms and
R2 is a methyl or ethyl group, 2 to 20% by weight of an alkoxysiloxane of the formula ##STR1## wherein R3 is an alkyl group with 1 to 6 carbon atoms
a is 0.8 to 1.2 and
b is 0.2 to 1.2,
0.01 to 5% by weight of an emulsifier, 0.01 to 0.1% by weight of fillers with an effective surface area of at least 40 m2 /g and 49.9 to 95.48% by weight of water. The composition has a long shelf life and, due to its high penetration, a high water-repellent effect on the surface, as well as deep within, all mineral building materials.
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Citations
13 Claims
- 1. A composition for the impregnation of porous mineral building materials to protect such materials against penetration by water comprising an emulsion of 2.5 to 25% by weight of an alkoxysilane of the formula
- space="preserve" listing-type="equation">R.sup.1 -Si(OR.sup.2).sub.3
wherein R1 is an alkyl group with 3 to 12 carbon atoms and R2 is a methyl or ethyl group, 2 to 20% by weight of an alkoxysiloxane of the formula ##STR7## wherein R3 is an alkyl group with 1 to 6 carbon atoms a is 0.8 to 1.2 and b is 0.2 to 1.2, - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 12)
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2. 01 to 5% by weight of an emulsifier, 49.9 to 95.48% by weight of water.
- 10. A method for protecting porous mineral building materials against penetration by water comprising impregnating said porous mineral building materials with a composition comprising an emulsion of 2.5 to 25% by weight of an alkoxysilane of the formula
- space="preserve" listing-type="equation">R.sup.1 -Si(OR.sup.2).sub.3
wherein R1 is an alkyl group with 3 to 12 carbon atoms and R2 is a methyl or ethyl group, 2 to 20% by weight of an alkoxysiloxane of the formula ##STR8## wherein R3 is an alkyl group with 1 to 6 carbon atoms a is 0.8 to 1.2 and b is 0.2 to 1.2, - View Dependent Claims (13)
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11. 01 to 5% by weight of an emulsifier, and 49.9 to 95.48% by weight of water.
Specification