Preparation for the water-repellent impregnation of porous mineral building materials

• US 5,091,002 A
• Filed: 03/12/1990
• Issued: 02/25/1992
• Est. Priority Date: 04/08/1989
• Status: Expired due to Term

• Current Assignee: Evonik Goldschmidt GmbH (Rag-Stiftung)
• Original Assignee: Th. Goldschmidt AG (Rag-Stiftung)
• Inventors: Fritsch, Herwig, Schamberg, Eckehard, Sucker, Roland, Grasse, Manfred, Koerner, Gotz
• Primary Examiner(s): Dixon, Jr., William R.
• Assistant Examiner(s): Bonner, Carol
• Application Number:
  US07/492,086
• Time in Patent Office: 715 Days
• Field of Search: 106/2, 106/287.16, 106/287.14, 524/801, 524/837, 427/421, 427/136
• US Class Current: 106/2
• CPC Class Codes: C04B 2103/40 Surface-active agents, dispersants
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 41/009 characterised by the material treated
• CPC Class Codes: C04B 41/4539 as a emulsion, dispersion or suspension
• CPC Class Codes: C04B 41/4922 applied to the substrate as monomers, i.e. as organosilanes RnSiX4-n, e.g. alkyltrialkoxysilane, dialkyldialkoxysilane
• CPC Class Codes: C04B 41/4961 Polyorganosiloxanes, i.e. polymers with a Si-O-Si-O-chain; "silicones"
• CPC Class Codes: C04B 41/502 Water
• CPC Class Codes: C04B 41/64 Compounds having one or more carbon-to-metal of carbon-to-silicon linkages

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.

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

View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 12)

3. The composition of claim 1, in which the R² group is an ethyl group.

4. The composition of claim 1, in which the emulsifier is present in an amount of 0.01 to 0.5% by weight.

5. The composition of claim 1, in which the emulsifier is effective to emulsify the alkoxysilane and alkoxysiloxane with water.

6. The composition of claim 1, in which the emulsifier is a nonionic emulsifier.

7. The composition of claim 1, in which the sum of a+b is within the range of 1.2 to 2.4.

8. The composition of claim 1, which also contains a catalyst which is an emulsion of an organometallic compound.

9. The composition of claim 1, which is obtained by mixing an emulsion containing the alkoxysilane, with an emulsion, containing the alkoxysiloxane.

12. The composition of claim 1, further comprising 0.01 to 0.1% by weight of filler with an effective surface area of at least 40 m² /g.

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

View Dependent Claims (13)

13. The composition of claim 10 in which the filler is hydrophobic silica.

11. 01 to 5% by weight of an emulsifier, and 49.9 to 95.48% by weight of water.