초록 ▼

The invention relates to water-repellant liquid silicone compositions intended for impregnating porous building materials, such as mineral or (ligno)cellulosic materials And comprising epoxy functionalized polyorganosiloxanes as main active material in these water-repellant liquid silicone compositi

The invention relates to water-repellant liquid silicone compositions intended for impregnating porous building materials, such as mineral or (ligno)cellulosic materials And comprising epoxy functionalized polyorganosiloxanes as main active material in these water-repellant liquid silicone compositions. The invention also relates to a process for making said porous building materials, water-repellant with the aid of the above said liquid silicone composition, and a process for preparing this composition is also targeted by the invention.

대표청구항 ▼

The invention claimed is: 1. A process for making a porous mineral building material water-repellent, this process comprising the steps of: a) applying to said material a water-repellent liquid silicone composition comprising at least 50% by weight of a cyclic polyorganosiloxane bearing units: o

The invention claimed is: 1. A process for making a porous mineral building material water-repellent, this process comprising the steps of: a) applying to said material a water-repellent liquid silicone composition comprising at least 50% by weight of a cyclic polyorganosiloxane bearing units: or of a linear (POS) (I) having said units, of formula (I): wherein: the radicals R1 are identical to or different than each other and each represent an alkyl, an aryl, an arylalkyl or Y; the radicals R2 are identical to or different than each other and each represent an alkyl, an aryl or an arylalkyl; the radical R3 represents an alkyl, an aryl, an arylalkyl or Y; the radical Y is a functional radical carrying at least one epoxy unit; a and b are chosen such that: description="In-line Formulae" end="lead" 1≦a+b≦1 000description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"anddescription="In-line Formulae" end="tail" description="In-line Formulae" end="lead" 1/1 000≦b/(a+b)<1description="In-line Formulae" end="tail" if b equals to 0, at least one of the radicals R1 on each of the two terminal Si atoms of the POS of formula (I) represents Y, said cyclic or linear POS being capable by itself of crosslinking as soon as it comes into contact with the building material and or of reacting with said building material to bind thereto. b) impregnating and penetrating said composition into said material, and c) crosslinking and/or reacting said POS with said material, leading to the formation of bonds between the POS and the material. 2. The process as claimed in claim 1, wherein the (POS) is a linear (POS) (I) having units of formula (I), wherein: the radicals R1 are a linear or branched C1-C10 alkyl or a phenyl; the radicals R2 are a linear or branched C1-C10 alkyl or a phenyl; the radical R3 represents a linear or branched C 1-C10 alkyl or a phenyl; a and b are chosen such that: description="In-line Formulae" end="lead"50 ≦a+b≦100description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"anddescription="In-line Formulae" end="tail" 1/20≦b/(a+b)<쩐 and POS (I) representing at least 90% by weight of the active material. 3. The process as claimed in claim 1, wherein b is other than 0 in formula (I). 4. The process as claimed in claim 1, wherein the POS (I) is functionalized with at least one epoxy-functional radical Y, linked to the silicon of the POS via a divalent radical containing from 2 to 20 carbon atoms which optionally contain at least one hetero atom. 5. The process as claimed in claim 4, wherein Y is one of the following radicals: 6. The process as claimed in claim 1, wherein the water-repellent liquid silicone composition is an aqueous emulsion containing: b) one or more POS (I), c) one or more surfactants, and d) water. 7. The process as claimed in claim 1, wherein the composition is a solution of the (POS) (I) in an organic solvent. 8. The process as claimed in claim 1, wherein the porous mineral building material is selected from the consisting of: CaCO3-based minerals, SiO2-based minerals, aluminosilicate-based minerals, terracottas, and concretes/mortars. 9. The process as claimed in claim 1, wherein the POS (I) further contains radicals Y' bearing (di)carboxy, (di)carboxylate or anhydride units and wherein the porous building material is selected from minerals comprising CaCO3. 10. The process as claimed in claim 1, wherein the composition is free of functionalized or nonfunctionalized silane(s). 11. The process as claimed in claim 1, wherein the composition further comprises additives selected from the group consisting of: silicas, Lewis acids, silicone resins bearing siloxy units M, Q and/or T, alkylaminosilanes, and aminated additives. 12. The process as claimed in claim 11, wherein said additives are; colloidal silicas, sulfates, hydrogen sulfates, triflates, oxalates, silicates, or alkylaminosilanes of general formula (II) below: description="In-line Formulae" end="lead"R5--[Si]--[OR6]3 (II)description="In-line Formulae" end="tail" wherein: R5 is an aminoalkyl radical containing from 1 to 6 carbon atoms or a group of general formula: H2N--(CH2) xR7--(CH2)z--; with R7 representing O, S,--NH--or NH--CH2--CH2--NH--and x≦2, y≦2; or a group of general formula: (R6O)3--(CH2)x--NH--(CH2) x, with x as defined above; and R6 corresponding to CnH2n+1 with n is up to 10.