Use of zinc salts in combination with alkyl amines in cement-based dry mortar mixtures

1. A binder composition comprising

i) 0.1° A to 99.9% by weight of Portland cement,

ii) 0.1% to 99.9% by weight of alumina cement,

iii) optionally 0.1% to 99.0% by weight of calcium sulfate,

iv) 0.01% to 10.0% by weight of at least one zinc salt, and

v) 0.01% to 10.0% by weight of at least one alkylamine, based on the total weight of the binder composition.

2. The binder composition according to claim 1 , wherein the at least one zinc salt is selected from the group consisting of zinc oxide, zinc hydroxide, zinc chloride, zinc iodide, zinc bromide, zinc phosphate, zinc hydrogen phosphate, zinc dihydrogen phosphate, zinc carbonate, zinc hydrogen carbonate, zinc nitrate, zinc nitrite, zinc sulfate, zinc thiosulfate, zinc hydrogen sulfate, zinc sulfite, zinc sulfide, zinc formate, zinc acetate, zinc gluconate, zinc stearate, zinc tartrate, zinc citrate, and mixtures thereof.

3. The binder composition according to claim 2 , wherein the at least one zinc salt is zinc citrate and/or zinc sulfate.

4. The binder composition according to claim 1 wherein the at least one alkylamine is an amino alcohol and/or a salt thereof.

5. The binder composition according to claim 4 , wherein the amino alcohol is selected from the group consisting of tris(hydroxymethylamino)methane, diethanolamine, triethanolamine, triisopropanolamine or salts thereof and mixtures thereof.

6. The binder composition according to claim 1 further comprising up to 10.0% by weight, based on the total weight of the binder composition, of at least one additive selected from the group consisting of thickeners, water-retention agents, pH modifiers, accelerators, retarders, rheology modifiers, hydrophobizing agents, pigments, organic or inorganic fibers, and mixtures thereof.

7. The binder composition according to claim 1 further comprising up to 10.0% by weight of at least one surface-active substance, based on the total weight of the binder composition.

8. The binder composition according to claim 7 , wherein the at least one surface-active substance is selected from the group consisting of air-entraining agents, defoamers, wetting additives, superplasticizers, surfactants, and mixtures thereof.

9. The binder composition according to claim 1 further comprising at least one dispersion powder selected from the group consisting of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl acetate (PVAc), polyvinyl alcohol (PVOH), polystyrene (PS), polyacrylate (PAc), polybutadienes (BR), vinyl esters, Versatates, and copolymers and/or mixtures thereof.

10. The binder composition according to claim 1 further comprising at least one latently hydraulic and/or pozzolanic component selected from the group consisting of natural or thermally activated rock powders, microsilica, metakaolin, aluminosilicates, fly ashes, volcanic ashes, trass, rice-husk ash, activated clay, pozzolans, slag sand, burnt oil shale, and mixtures thereof.

11. An article comprising the binder composition according to claim 1 .

12. The article according to claim 11 , wherein the article is a dry-mortar mixture.

13. The article according to claim 11 , further comprising at least one filler.

14. The article according to claim 13 , wherein the filler is at least one from the following series: chalk, quartz sand, quartz powder, rock powders, lightweight fillers, calcite, dolomite, talc, kaolin, mica, heavy spar, pumice powder, perlite, mineral foam, foam beads, pumice, foam glass, hollow-glass spheres, vermiculite, and calcium silicate hydrate.

15. A method of achieving high early strengths in a binder composition, the method comprising adding 0.01% to 10.0% by weight of at least one zinc salt and 0.01% to 10.0% by weight of at least one alkylamine to a hardenable binder composition comprising components i), ii), and iii) according to claim 1 .