TH17868B - A water-repellent mixture that is stable when stored. - Google Patents

Abstract

DC60 (18/05/42) disclosed a storage-stable mixture optimized for providing water-repellent properties to masonry building materials. The mixture consists of an aqueous emulsion with a continuous aqueous phase and a discrete organosilicon phase. The emulsion is formulated from a composition consisting of (A) an insoluble alkoxysilane with the average formula Rn-Si-R'(4-n), where n is a number from 1 to 2, R is a C5-C20 monovalent hydrocarbon radical, and R' is a C1 to C4 alkoxy group; and (B) a polysiloxane with hydrogen functional groups containing at least two hydrogen atoms linked by silicon per molecule. At least five siloxy units per molecule and a kinematic viscosity between 0.5 x 10⁻⁶ and 1,000 x 10⁻⁶ m²/s at 25 °C. (C) emulsifier and (D) water. A discrete organosilicon phase consists of components (A) and (B), and a continuous aqueous phase consists of water. Components (A) : (B) are present in the organosilicon phase in a weight ratio of (A):(B). Such an emulsion exhibits both physical and chemical stability after being stored at room temperature for six months or at 50 °C for six weeks. A stable mixture upon storage is revealed, which is optimized to provide water-repellent properties to masonry building materials. Such a mixture consists of an aqueous emulsion with a continuous aqueous phase and a discrete organosilicon phase. The emulsion is formulated from components consisting of (A) an insoluble alkoxysilane with a typical average formula. (A) a polysiloxane with at least two silicon-linked hydrogen functional groups per molecule, at least five siloxane units per molecule, and a dienematic viscosity between 0.5 x 10-6 and 1,000 x 10-6 m²/s at 25°C; (C) an emulsifier; and (D) water. The discrete organosilicon phase consists of components (A) and (B), and the continuous aqueous phase consists of water. Components (A) : (B) are present in the organosilicon phase in a weight ratio of (A); (B) such that the emulsion is both physically and chemically stable after being stored at room temperature for six months or at 50°C for six weeks.

Claims (15)

1. Storage-stable mixtures of aqueous emulsions defined as a continuous aqueous phase and a discontinuous organosilicon phase. Such emulsions are formulated from a composition consisting of (A) an insoluble alkoxysilane with the general average formula Ra-Si-R'(4-n), where n is a number from 1 to 2, R is a C5-C20 monovalent hydrocarbon radical, and R' is a C1 to C4 alkoxy group; (B) polysiloxanes with at least two silicon-linked hydrogen functional groups per molecule, with at least five siloxy units per molecule. The organosilicon phase consists of (A) and (B) emulsifier and (D) water. The discrete organosilicon phase contains components (A) and (B), and the continuous aqueous phase contains the water. Components (A) and (B) are present in the organosilicon phase in weight ratios of (A) and (B) such that the emulsion is physically and chemically stable after being stored at room temperature for six months or for six weeks at 50°C, and the organosilicon phase is present in the aqueous emulsion from approximately 10 to approximately 75 percent by weight. 2. A mixture according to claim 1 in which component (B) is a weight ratio of component (A)(B) from 10:90 to 90:10. 3. The mixture according to claim 1, in which the composition (B) is a dimethyl/methyl-hydrogen linear siloxane copolymer terminated with trimethylsiloxy containing three methyl-hydrogen siloxy groups and five dimethylsiloxy groups, and a dynetic viscosity of 10x10-6 m2/s. 4. A mixture according to claim 3 in which the weight ratio of components (A):(B) is from 10:90 to 90:10. 5. The mixture according to claim 1, in which the composition (B) is a dimethyl/methyl hydrogen linear siloxane copolymer terminated with trimethyl siloxane containing three methyl-hydrogen siloxane groups and five dimethyl siloxane groups, and a dimatic viscosity of 10x10-6/s. 6. A mixture according to claim 5 in which the weight ratio of component (A) : (B) is approximately 1:3. 7. A mixture according to claim 1 in which the emulsifier (C) has an HLB value of 2-20. 8. The mixture according to claim 7, in which the emulsifier (C) has an HLB value of 4-17. 9. The mixture according to claim 1, whereby the emulsifier is polyoxyethylene lauryl ether. 10. The mixture according to claim 1 shall be supplemented with a sufficient amount of acid to give the mixture a pH of 4-5. 11. The mixture according to claim 1, in which the organosilicon phase is present in the aqueous emulsion in an amount ranging from approximately 40 to approximately 60 percent by weight. 12. The building material consists of; a substrate brick, such substrate brick has at least one surface; at least one such surface is coated with a water-repellent glaze. Such water-repellent glaze is formed from an aqueous emulsion which is defined as a continuous aqueous phase and a discrete organosilicon phase; such emulsion is formulated from the following components: (A) an insoluble alkoxysilane with the average general formula Ra-Si-R'(4-n), where n is a number from 1 to 2, R is a C5-C20 monovalent hydrocarbon radical, and R' is a C1-C4 alkoxy group; (B) a polysiloxane containing a hydrogen functional group with at least two hydrogen atoms bonded to at least five silicon units per molecule. and kinematic viscosity between approximately 0.5 x 10-6 and 1,000 x 10-6 m²/s at 25 °C. (C) emulsifier; and (D) water. The discrete organosilicon phase consists of components (A) and (B), and the continuous aqueous phase consists of the said water; components (A) and (B) are present in the organosilicon phase in a weight ratio of (A):(B) such that the emulsion is physically and chemically stable when stored at room temperature for six months or for six weeks at 50 °C; and the organosilicon phase is present in the aqueous emulsion in amounts ranging from approximately 10 to approximately 75 percent by weight. 13. Method for the production of a storage-stable mixture consisting of an aqueous emulsion with a continuous aqueous phase and a discrete organosilicon phase, consisting of the following steps: (I) Mixing of components consisting of (A) an insoluble alkoxysilane with the general average formula Ra-Si-R''(4-n), where n is a number from 1 to 2, R is a C5-C20 monovalent hydrocarbon radical and R' is a C1 to C4 alkoxy group, and (B) a polysiloxane with a hydrogen functional group of at least two hydrogen atoms bonded with at least five silicon units per molecule and a dienematic viscosity. Between approximately 0.5 x 10-6 and 1,000 x 10-6 m²/s at 25 °C and (II) the combination of the mixture obtained in step (I) with (C) the emulsifier and (D) water and (III) the emulsifier of the mixture obtained in step (II) to form such an emulsion in which the discrete organosilicon phase consists of components (A) and (B) and the continuous aqueous phase consists of (D) and water. Components (A) and (B) are present in the organosilicon phase in a weight ratio of (A) : (B) such that the emulsion is physically and chemically stable after storage for six months at room temperature or six weeks at 50 °C and the organosilicon phase is present in the aqueous emulsion in an amount ranging from approximately 10 to approximately 75 percent by weight. 14. Methods for coating substrate bricks with water-repellent coatings, where the substrate brick has at least one surface, the method consists of a step of coating at least one such surface with an aqueous emulsion of a continuous aqueous phase and a discontinuous organosilicon phase; such emulsion is formulated from the following components: (A) an insoluble alkoxysilane with the average general formula Ra-Si-R'(4-n), where n is a number from 1 to 2, R is a C5-C20 monovalent hydrocarbon radical, and R' is an alkoxy group from C1 to C4; (B) a polysiloxane with at least two hydrogen atoms functional groups bonded with at least five silicon units per molecule and a kinematic viscosity between approximately 0.5 x 10-6 and 1,000 x 10-6 m²/s at 25 °C; (C) an emulsifier; (D) Water. The discrete organosilicon phase contains elements (A) and (B), and the continuous aqueous phase contains water; elements (A) and (B) are present in the organosilicon phase in a weight ratio of (A):(B) such that the emulsion is physically and chemically stable after being stored at room temperature for six months or for six weeks at 50°C; and the organosilicon phase is present in the aqueous emulsion in amounts ranging from approximately 10 to approximately 75 percent by weight. 15. Methods for providing constructible brick compounds with water-repellent properties; such methods consist of a process of combining such constructible brick compounds with an aqueous emulsion of a continuous aqueous phase and a discrete organosilicon phase; such emulsion is formulated from a composition consisting of (A) an insoluble alkoxysilane with the general average formula Ra-Si-R'(4-n), where n is a number from 1 to 2, R is a C5-C20 monovalent hydrocarbon radical, and R'' is a C1 to C4 alkoxy group; (B) a polysiloxane with a hydrogen functional group containing at least two silicon-linked hydrogen atoms per molecule, at least five siloxy units per molecule, and a dienematic viscosity between approximately 0.5 x 10-6 and 1,000 x 10-6 m²/s at 25 °C; (C) an emulsifier; (D) water. The discrete organosilicon phase contains elements (A) and (B), and the continuous aqueous phase contains water; elements (A) and (B) are present in the organosilicon phase in a weight ratio of (A):(B) such that the emulsion is physically and chemically stable after being stored at room temperature for six months or for six weeks at 50°C; and the organosilicon phase is present in the aqueous emulsion in amounts ranging from approximately 10 to approximately 75 percent by weight.