METHODS OF TREATING SURFACES WITH IONIC ORGANOSILICON COMPOSITIONS

• US 20080026156A1
• Filed: 08/29/2006
• Published: 01/31/2008
• Est. Priority Date: 07/07/2006
• Status: Active Grant

• Current Assignee: Zydex Industries
• Original Assignee: Zydex Industries
• Inventors: Ranka, Ajay Ishwarlal, Mehta, Prakash Vithaldas
• Granted Patent: US 7,704,561 B2
• Time in Patent Office: Days
• US Class Current: 427/393.4
• CPC Class Codes: C04B 14/06 Quartz; Sand
• 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 41/4933 containing halogens, i.e. organohalogen silanes
• CPC Class Codes: C04B 41/4944 containing atoms other than carbon, hydrogen, oxygen, silicon, alkali metals or halogens, e.g. N-silyldisilazane: Image

Abstract

This invention is directed to methods of treating inorganic surfaces with aqueous compositions including ionic organosilicon compounds. Surprisingly, it has been found that the application of water soluble ionic organosilicon compounds, which until the present invention have only been used in small quantities to solubilize silanes, to inorganic surfaces provides the treated surface with an excellent hydrophobic property. The present invention exclusively utilizes ionic organosilicon compounds as the main or sole component for imparting water repellency upon surface treatment of inorganic substrates. The methods of the present invention comprise the application of ionic ogranosilicon compounds to inorganic surfaces whereby imparting water resistance to the substrate. After application, a treated surface may be characterized as having a long term water repellant property.

Claims

1. A method of treating a surface to render the surface water repellant comprising applying to the surface an aqueous solution consisting essentially of at least one ionic organosilicon compound.

2. The method according to claim 1;

wherein said ionic organosilicon compounds are selected from the group consisting of;

3. The method according to claim 1, wherein the step of applying an aqueous solution comprises applying only one ionic organosilicon compound of the formula:

4. The method according to claim 3, wherein said ionic organosilicon comprises between about 0.1 to about 10 weight percent of said aqueous solution.

5. The method according to claim 1, wherein said applying step comprises spraying said aqueous solution onto said surface.

6. The method according to claim 1;

wherein said applying step comprises applying the aqueous solution to an inorganic surface.

7. The method according to claim 6;

wherein said surface is selected from the group consisting of concrete, masonry products, gypsum, concrete blocks, cinder blocks, soft mud bricks, sand lime bricks, drain tiles, ceramic tiles, sandstone, plaster, clay bricks, natural stones and rocks, roofing tiles, calcium silicate bricks, cement articles, slag stones and bricks, stucco, limestone, macadam, marble, grouts, mortar, terrazzo, clinker, pumice, terra, cotta, porcelain, adobe, coral, dolomite and asphalt.

8. A method of treating a surface to render the surface water repellant comprising:

i) dissolving an ionic organosilicon compound in water to form an aqueous solution of the ionic organosilicon compound;

ii) applying the aqueous solution onto an inorganic surface; and

iii) allowing the aqueous solution to dry so that the ionic organosilicon compound bonds with reactive sites present on the inorganic surface to form a protective water repellant layer on said inorganic surface.

9. The method according to claim 8;

wherein said ionic organosilicon compound is selected from the formula;

10. The method according to claim 9, wherein said ionic organosilicon comprises between about 0.1 and 10 weight percent of said aqueous solution.

11. The method according to claim 10;

wherein said ionic organosilicon is at least one of 3-(trimethoxysilyl)propyldimethyloctadecyl ammonium chloride, 3-(trimethoxysilyl)propylmethyldidecyl ammonium chloride, and 3-(trimethoxysilyl)propyldimethylhexadecyl ammonium chloride.

12. The method according to claim 11;

wherein the step of applying said aqueous solution is selected from the group consisting of at least one of brushing, rolling and spraying said aqueous solution onto said surface.

13. A water repellant article comprising an inorganic surface having a water resistant layer bonded to said surface, said water resistant layer comprising a polycondensate of a water soluble ionic organosilicon compound.

14. The water repellant article of claim 13;

wherein said water resistant layer and said inorganic surface are attached by Si—

O—

Si bonds.

15. The water repellant article of claim 14;

wherein said water resistant layer further comprises long chain alkyl groups bonded to an ionic group.

16. The water repellant surface of claim 15;

wherein said long chain alkyl groups are located such that water cannot reach said ionic group.

17. The water repellant surface of claim 16;

wherein wherein said water resistant layer comprises a polycondensate of an ionic organosilicon compound of the formula;

18. The water repellant surface of claim 16;

wherein said water resistant layer comprises a polycondensate of at least one of 3-(trimethoxysilyl)propyldimethyloctadecyl ammonium chloride, 3-(trimethoxysilyl)propylmethyldidecyl ammonium chloride, and 3-(trimethoxysilyl)propyldimethylhexadecyl ammonium chloride.