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US 10,259,748 B2Granted
Use of aqueous emulsions based on propylethoxysilane oligomers as an additive in hydraulically setting cement compositions for reduction of shrinkage characteristics
AssigneeEvonik Degussa GmbH
InventorsMichael Schottler, Christine Fliedner, Thomas Roehrig
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Abstract
An aqueous oil-in-water emulsion containing a propylethoxysilane oligomer mixture or a mixture of a propylethoxysilane oligomer mixture and octyltriethoxysilane in a weight ratio of 3:1 to 1:3, at least one emulsifier or an emulsifier system, at least one content of a 2-aminoethanol and water is used as an addition in the production of hydraulically setting cement mixtures such as mortar, screed or concrete for reduction of the shrinkage characteristics.
Claims12
An aqueous emulsion, comprising:
- a propylethoxysilane oligomer mixture or a mixture of a propylethoxysilane oligomer mixture and octyltriethoxysilane in a weight ratio of 3:1 to 1:3,
- at least one emulsifier or an emulsifier system,
- at least one content of N,N-diethyl-2-aminoethanol, and
- water,
- wherein said emulsion has a pH of 8 to 12;
- and
- wherein, when added to a cement mixture, shrinkage of a hardened cement mixture is reduced relative to a hardened cement mixture which does not contain said emulsion
- wherein the emulsion has a content of propylethoxysilane oligomer mixture of 20% to 85% by weight, based on the total weight of the emulsion, wherein an oil phase totals 40% to 85% by weight, based on the total weight of the emulsion.
5 more elements
Dependencies are inferred from the claim text.