Method for enhancing water-repellency treatment of mineral hydraulic binder compositions and compositions obtainable by said method and their uses
View Patent ↗The invention concerns a method for enhancing water-repellency repellency treatment of mineral hydraulic binder compositions and compositions obtainable by said method and their uses in the building sector, said method comprising the step of adding a sufficient amount of at least one monovalent cation salt of a carboxylic acid to said composition.
1. A method for enhancing the water repellency of an inorganic hydraulic binder composition, comprising the step of adding a sufficient amount of at least one monovalent cation salt of a carboxylic acid to said composition, said acid having an hydrocarbon chain optionally having halogens, hydroxyl groups, ether groups, thioether groups, ester groups, amide groups, carboxyl groups, sulfonic acid groups, carboxylic anhydride groups or carbonyl groups
wherein the monovalent cation salt of a carboxylic acid has the formula C n H (2n-1) OO − X + wherein n=4 to 18 and X is an alkali metal.
2. The method as claimed in claim 1 , wherein the monovalent cation salt of a carboxylic acid is in the form of a powder in the inorganic hydraulic binder composition.
3. The method as claimed in claim 1 , wherein the amount is between 0.001% and 3% by dry weight of the monovalent cation salt of a carboxylic acid, with respect to the total weight of the composition.
4. The method as claimed in claim 3 , wherein the amount is between 0.01% and 0.5%.
5. The method as claimed in claim 4 , wherein the amount is between 0.03% and 0.15%.
6. The method as claimed in claim 1 , further comprising the step of premixing the monovalent cation salt of a carboxylic acid with a latex composition.
7. The method as claimed in claim 6 , wherein the amount of the monovalent cation salt of a carboxylic acid, with respect to the total weight of dry latex, is between 0.1 and 20% by weight, with respect to the weight of the dry latex.
8. The method as claimed in 6 , wherein the monovalent cation salt of a carboxylic acid is added in the powder form to the latex composition in the form of a redispersible powder.
9. The method as claimed in claim 6 , wherein the monovalent cation salt of a carboxylic acid is added in the powder or solution form to the latex composition in the form of an aqueous dispersion during the polymerization or at the end of the polymerization.
10. The method as claimed in claim 6 , wherein the monovalent cation salt of a carboxylic acid is added in the powder form to the latex composition during a further step of drying by atomization of the latex.
11. The method as claimed in claim 6 , wherein the latex composition comprises:
at least one water-insoluble polymer,
from 0 to 35% by weight, with respect to the total weight of the polymer, of at least one protective colloid,
from 0 to 30% by weight, with respect to the total weight of the polymer, of anticaking agents, and
from 0.1 to 20% by weight, with respect to the total weight of the polymer, of at least one monovalent cation salt of a carboxylic acid.
12. The method as claimed in claim 11 , wherein the water-insoluble polymer is obtained by polymerization of vinyl esters, alkyl acrylates, alkyl methacrylates, whose alkyl group has from 1 to 10 carbon atoms, and/or vinylaromatic monomers.
13. The method as claimed in claim 12 , wherein the water-insoluble polymer is obtained by polymerization of monomers selected from the group consisting of: vinyl acetate,
methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, methyl acrylate, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, and styrene.
14. The method as claimed in claim 12 , wherein the monomers are further copolymerized with other monomers possessing ethylenic unsaturation being olefins, vinyl esters of saturated, branched or unbranched, monocarboxylic acids having from 1 to 12 carbon atoms, esters of branched C 9 -C 11 acids, vinyl pivalate or vinyl laurate; esters of unsaturated mono- or dicarboxylic acids having 3 to 6 carbon atoms with alkanols having 1 to 10 carbon atoms, vinylaromatic monomers, vinyl halides, diolefins, (meth)allyl esters of (meth)acrylic acid; (meth)allyl esters of the mono- and diesters of maleic, fumaric and itaconic acids; or alkene derivatives of amides of acrylic and methacrylic acids.
15. The method as claimed in claim 11 , wherein the anticaking agents are aluminum silicates, calcium carbonates, magnesium carbonates, silicas, aluminum hydrate, bentonite, talc, kaolin, barium sulfate, titanium oxide, or calcium sulfoaluminate (satin white).
16. The method as claimed in claim 1 , wherein the monovalent cation salt of a carboxylic acid has the formula C n H (2n-1) OO − X + wherein n=4 to 18 and X is sodium, potassium, lithium, ammonium or quaternary amines.
17. The method as claimed in claim 16 , wherein n=8 to 16.
18. The method as claimed in claim 1 , wherein the monovalent cation salt of a carboxylic acid is sodium laurate and/or potassium laurate.
19. The method as claimed in claim 1 , wherein the hydraulic binder is a cement, cement of Portland, high-alumina cement, blast-furnace cement, fly ash, calcined shale or pozzolan.
20. A grout, mortar or concrete comprising an inorganic hydraulic binder composition made by the process of claim 1 .
21. A method for enhancing the water repellency of an inorganic hydraulic binder composition, comprising the step of adding a sufficient amount of at least one monovalent cation salt of a carboxylic acid to said composition, said acid having an hydrocarbon chain optionally having halogens, hydroxyl groups, ether groups, thioether groups, ester groups, amide groups, carboxyl groups, sulfonic acid groups, carboxylic anhydride groups or carbonyl groups and the step of premixing the monovalent cation salt of a carboxylic acid with a latex composition
wherein the latex composition comprises:
at least one water-insoluble polymer,
from 0 to 35% by weight, with respect to the total weight of the polymer, of at least one protective colloid,
from 0 to 30% by weight, with respect to the total weight of the polymer, of anticaking agents wherein the anticaking agents are aluminum silicates, calcium carbonates, magnesium carbonates, silicas, aluminum hydrate, bentonite, talc, kaolin, barium sulfate, titanium oxide or calcium sulfoaluminate (satin white), and
from 0.1 to 20% by weight, with respect to the total weight of the polymer, of at least one monovalent cation salt of a carboxylic acid.