Use of polyol for reducing shrinkage of construction chemical compositions
AssigneeSika Technology AG
InventorsMarkus Knoebel, Nick Schneider
Life of this patent
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Abstract
The use of polyol having a functionality of 4 or less and an OH group density of at least 0.033 mol OH per g polyol as a composition for reducing shrinking of construction chemicals on the basis of a hydraulic binder comprising a) alumina cement and/or calcium sulfoaluminate cement, b) calcium sulfate, and c) optionally Portland cement.
Claims17
A method for reducing the shrinkage of a construction chemical composition based on a hydraulic binder, the method comprising
- (i) adding at least one polyol having a functionality of 4 or less and an OH group density of at least 0.033 mol OH per g polyol to the construction chemical composition, wherein the polyol is selected from erythritol,
- (ii) adding water to the dry construction chemical composition,
- (iii) mixing the construction chemical composition, and
- (iv) applying the construction chemical composition to a substrate,
- wherein the hydraulic binder comprises
- a) aluminate cement and/or calcium sulfoaluminate cement,
- b) calcium sulfate, and
- c) optionally portland cement.
A reduced-shrinkage construction chemical composition comprising
- a) a hydraulic binder comprising
- a1) aluminate cement and/or calcium sulfoaluminate cement,
- a2) calcium sulfate, and
- a3) optionally portland cement, and
- b) at least one polyol having a functionality of 4 or less and an OH group density of at least 0.033 mol OH per g polyol, wherein the polyol is selected from erythritol.
A reduced-shrinkage construction chemical composition comprising, in each case based on the total dry mass of the construction chemical composition,
- a) 5-70% by weight of a hydraulic binder comprising
- a1) aluminate cement and/or calcium sulfoaluminate cement,
- a2) calcium sulfate, and
- a3) optionally portland cement,
- b) at least one polyol having a functionality of 4 or less and an OH group density of at least 0.033 mol OH per g polyol, wherein the polyol is selected from erythritol,
- c) 10-80% by weight of aggregates, and
- e) optionally additives selected from the group consisting of accelerators, retardants, flow aids, rheological aids, thickeners, pigments, and biocides.
A method for reducing the shrinkage of a construction chemical composition based on a hydraulic binder, the method comprising
- (i) adding at least one polyol having a functionality of 4 or less and an OH group density of at least 0.033 mol OH per g polyol to the construction chemical composition,
- (ii) adding water to the dry construction chemical composition,
- (iii) mixing the construction chemical composition, and
- (iv) applying the construction chemical composition to a substrate,
- wherein the hydraulic binder comprises
- a) aluminate cement,
- b) calcium sulfate, and
- c) portland cement,
- wherein a weight ratio of aluminate cement to portland cement of from 10:1 to 1:1, and
- wherein the at least one polyol is used in an amount of between 1.2% by weight to 2% by weight, based on the amount of aluminate cement.
A reduced-shrinkage construction chemical composition comprising, in each case based on the total dry mass of the construction chemical composition,
- a) 5-70% by weight of a hydraulic binder comprising
- a1) aluminate cement,
- a2) calcium sulfate, and
- a3) portland cement,
- b) at least one polyol having a functionality of 4 or less and an OH group density of at least 0.033 mol OH per g polyol,
- c) 10-80% by weight of aggregates, and
- e) optionally additives selected from the group consisting of accelerators, retardants, flow aids, rheological aids, thickeners, pigments, and biocides,
- wherein a weight ratio of aluminate cement to portland cement of from 10:1 to 1:1, and
- wherein the at least one polyol is used in an amount of between 1.2% by weight to 2% by weight, based on the amount of aluminate cement.
Dependencies are inferred from the claim text.