Water repellent organosilicon materials

Patent metadata

Field	Value
Publication number	US-9758431-B2
Application number	US-201314397653-A
Country	US
Kind code	B2
Filing date	May 2, 2013
Priority date	May 2, 2012
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A process for increasing the hydrophobicity of a porous product by treating the product, or a composition providing for the product, with a water repellent material, characterized in that the porous product or a composition providing the product, is treated with an aqueous suspension of microcapsules where the microcapsules comprise a water repellent organosilicon core material selected from an organosilane, a partially condensed organosilane and a branched siloxane resin, and a shell of a silicon-based network polymer comprising silica units.

First claim

The invention claimed is:

1. A process for increasing the hydrophobicity of a porous product by treating the product, or a composition providing for the product, with a water repellent material, characterised in that the porous product or a composition providing the product is treated with an aqueous suspension of microcapsules where the microcapsules comprise a water repellent organosilicon core material selected from the group consisting of an organosilane, a partially condensed organosilane, and a branched siloxane resin, and a shell of a silicon-based network polymer comprising silica units wherein the product is selected from the group consisting of cementitious substrates, cementious compositions, clay-based bricks, clay-based compositions, gypsum-based substrates, lime-based substrates, and wood-based substrates.

2. A process according to claim 1 wherein the water repellent organosilicon core material is an organosilane comprising at least one silicon-bonded alkyl group having 1 to 30 carbon atoms, or a partial condensation product of such an organosilane.

3. A process according to claim 2 wherein the water repellent organosilicon core material is an alkyltrialkoxysilane in which each alkoxy group has 1 to 4 carbon atoms.

4. A process according to claim 2 wherein the silicon-bonded alkyl group is an octyl group.

5. A process according to claim 1 wherein the water repellent organosilicon core material is a siloxane resin comprising siloxane units of the formula RSiO 3/2 where R represents an alkyl group.

6. A process according to claim 5 wherein the groups R in the siloxane units of the formula RSiO 3/2 comprise alkyl groups having 1 to 30 carbon atoms.

7. A process according to claim 1 wherein the water repellent organosilicon core material is a siloxane resin comprising siloxane units of the formula RSiO 3/2 where R represents an aryl group.

8. A process according to claim 1 where the microcapsules are obtained by the addition of tetraalkoxysilane to an aqueous emulsion of a water repellent organosilicon material selected from the group consisting of an organosilane, a partially condensed organosilane, and a branched siloxane resin, whereby the tetraalkoxysilane condenses and polymerises at the interface of droplets in the emulsion to form microcapsules.

9. A process according to claim 8 where a quaternised aminoalkylalkoxysilane is added to the aqueous emulsion before or simultaneously with the tetraalkoxysilane.

10. A process according to claim 1 wherein microcapsules comprising a water repellent organosilicon core material selected from the group consisting of an organosilane, a partially condensed organosilane, and a branched siloxane resin, and a shell of a silicon-based network polymer comprising silica units are added to the cementitious composition and the composition is shaped and hardened to form a cementitious product.

11. A process according to claim 10 for making a water repellent aerated cement product, wherein the microcapsules are added to a foamable cementitious composition.

12. A process according to claim 1 wherein microcapsules comprising a water repellent organosilicon core material selected from the group consisting of an organosilane, a partially condensed organosilane, and a branched siloxane resin, and a shell of a silicon-based network polymer comprising silica units are added to the clay based composition and the composition is shaped and hardened to form a brick or tile product.

Assignees

• Dow Corning

Inventors

• Campeol Frederick
• Galeone Fabrizio
• Lecomte Jean-Paul
• Marteaux Leon
• Sarrazin Marie-Jose
• Zimmerman Brett

Classifications

• C04B28/10

  Lime cements or magnesium oxide cements · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B41/64

  Compounds having one or more carbon-to-metal of carbon-to-silicon linkages · CPC title

• C04B41/502

  Water · CPC title

• C04B2111/27

  Water resistance, i.e. waterproof or water-repellent materials · CPC title