Construction material based on a mineral binder comprising synergistically effective hydrophobisation agent combinations
AssigneeKnauf Gips KG
InventorsJakub Gajski, Agnieszka Bogobowicz, Katarzyna Foltynska
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Abstract
The invention concerns construction materials based on a mineral binder, which include a synergistically effective hydrophobisation mixture. The invention also relates to methods for processing of such construction materials and the use of a synergistically effective mixture for the hydrophobisation of a mineral binder based construction material.
Claims5
A construction material based on a mineral binder comprising a mineral binder and a synergistically effective mixture of Ca(OH)2, a silicon-based hydrophobisation agent and a fatty acid salt-based hydrophobisation agent, or precursors of a fatty acid salt-based hydrophobisation agent,
- wherein Ca(OH)2 is present in a ratio of 2:1 to 20:1 relative to combined weight of said silicon-based hydrophobisation agent and said fatty acid salt-based hydrophobisation agent, and wherein the precursors of a fatty acid salt-based hydrophobisation agent is selected from fatty acid and esters thereof,
- wherein Ca(OH)2 is present in an amount of 1 wt. % to 15 wt. %, based on total dry weight of said construction material,
- wherein said silicon-based hydrophobisation 13 as agent is present in an amount of 0.01 wt. % to 4.99 wt. %, based on total dry weight of said construction material,
- wherein said fatty acid salt-based hydrophobisation agent, or precursors of said fatty acid salt-based hydrophobisation agent, is present in an amount of 0.01 wt. % to 4.99 wt. %. based on total dry weight of said construction material, and
- wherein said construction material has a lower average total absorptivity for water as determined in accordance with EN 520:2004 5.9.2, as compared to a comparable construction material that is free of Ca(OH)2, said silicon-based hydrophobisation agent, and said fatty acid salt-based hydrophobisation agent or precursors of said fatty acid salt-based hydrophobisation agent.
A method for the preparation of a construction material based on a mineral binder comprising the steps of:
- (i) mixing water with a mineral binder and a synergistically effective mixture of Ca(OH)2, a silicon-based hydrophobisation agent and a fatty acid salt-based hydrophobisation agent, or precursors of a fatty acid salt-based hydrophobisation agent and optionally additional additives;
- (ii) shaping the construction material, and
- (iii) allowing the construction material to set,
- wherein Ca(OH)2 is present in a ratio of 2:1 to 20:1 relative to combined weight of said silicon-based hydrophobisation agent and said fatty acid salt-based hydrophobisation agent, and wherein the precursors of a fatty acid salt-based hydrophobisation agent is selected from fatty acid and esters thereof,
- wherein Ca(OH)2 is present in an amount of 1 wt. % to 15 wt. %, based on total dry weight of said construction material,
- wherein said silicon-based hydrophobisation agent is present in an amount of 0.01 wt. % to 4.99 wt. %, based on total dry weight of said construction material,
- wherein said fatty acid salt-based hydrophobisation agent, or precursors of said fatty acid salt-based hydrophobisation agent, is present in an amount of 0.01 wt. % to 4.99 wt. %, based on total dry weight of said construction material, and
- wherein said construction material has a lower average total absorptivity for water as determined in accordance with EN 520:2004 5.9.2, as compared to a comparable construction material that is free of Ca(OH)2, said silicon-based hydrophobisation agent, and said fatty acid salt-based hydrophobisation agent or precursors of said fatty acid salt-based hydrophobisation agent.
Dependencies are inferred from the claim text.