Construction material based on a mineral binder comprising synergistically effective hydrophobisation agent combinations

Patent metadata

Field	Value
Publication number	US-12577162-B2
Application number	US-202018038116-A
Country	US
Kind code	B2
Filing date	Nov 24, 2020
Priority date	Nov 24, 2020
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

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.

First claim

The invention claimed is:

1 . 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.

2 . The construction material according to claim 1 , wherein the fatty acid in the fatty acid salt-based hydrophobisation agent is a C 4 to C 30 fatty acid, preferably a C 8 to C 24 fatty acid and more preferably a C 12 to C 22 fatty acid, or a mixture of such acids.

3 . The construction material according to claim 1 , comprising a total content of 0.02 to 5 wt.-% and preferably 0.04 to 1 wt.-% of all hydrophobisation agents based on the dry weight of the construction material.

4 . The construction material according to claim 1 , wherein the mineral binder is a hydraulic binder, preferably the hydraulic binder comprises a calcium sulfate based binder and/or a cement binder, most preferably the calcium sulfate based binder comprises more than 60 wt.-% calcium sulfate based on the total weight of the mineral binder.

5 . 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.

Assignees

• Knauf Gips Kg

Inventors

• Gajski Jakub
• Bogobowicz Agnieszka
• Foltynska Katarzyna

Classifications

• C04B2103/0004

  Compounds chosen for the nature of their cations · CPC title

• C04B24/42

  Organo-silicon compounds · CPC title

• C04B24/08

  Fats; Fatty oils; Ester type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats · CPC title

• C04B22/066

  Magnesia; Magnesium hydroxide · CPC title

• C04B22/064

  of the alkaline-earth metals · CPC title