Construction Material Based on a Mineral Binder Comprising Synergistically Effective Hydrophobisation Agent Combinations

Patent metadata

Field	Value
Publication number	US-2023365467-A1
Application number	US-202018038116-A
Country	US
Kind code	A1
Filing date	Nov 24, 2020
Priority date	Nov 24, 2020
Publication date	Nov 16, 2023
Grant date	—

Abstract

The invention concerns construction materials based on a mineral binder, which includes 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

1 . A construction material based on a mineral binder comprising a mineral binder and a synergistically effective mixture of a silicon-based hydrophobisation agent and a fatty acid salt-based hydrophobisation agent or precursors of a fatty acid salt-based hydrophobisation agent.

2 . The construction material based on a mineral binder comprising a mineral binder and a synergistically effective mixture of a hydroxide providing salt or compound and a silicon-based hydrophobisation agent in a ratio of 2:1 to 20:1.

3 . The construction material according to claim 2 , wherein the construction material further comprises a fatty acid salt-based hydrophobisation agent or precursors of a fatty acid salt-based hydrophobisation agent.

4 . The construction material according to wherein the hydroxide providing salt or compound is a calcium hydroxide, reactive calcium oxide or magnesium hydroxide.

5 . The construction material according to claim 1 , wherein the silicon-based hydrophobisation agent is selected from silanes, siloxanes and/or silicones.

6 . The construction material according to claim 1 , wherein the fatty acid in the fatty acid salt-based hydrophobisation agent is a C4 to C30 fatty acid, preferably a C8 to C24 fatty acid and more preferably a C12 to C22 fatty acid, or a mixture of such acids.

7 . The construction material according to claim 1 , wherein the fatty acid salt-based hydrophobisation agent comprises a mono-, di- or trivalent cation, preferably the cation is selected from Na + , NH + , Ca 2+ , Mg 2+ , Zn 2+ , Fe 2+ , Fe 3+ and/or Al 3+ .

8 . The construction material according to claim 1 , wherein the precursors of the fatty acid salt-based hydrophobisation agent combines with a cation of a cation providing salt or compound, preferably the cation providing salt or compound comprises a mono-, di- or trivalent cation, more preferably the cation providing salt or compound comprises Na + , NH + , Ca 2+ , Mg 2+ , Zn 2+ , Fe 2+ , Fe 3+ and/or Al 3+ .

9 . The construction material according to claim 1 , wherein the precursors of the fatty acid salt-based hydrophobisation agent combines with a cation of a cation providing salt or compound, preferably the cation providing salt or compound comprises alkaline earth metal oxides or hydroxides, aluminium hydroxide, zinc hydroxide, iron hydroxide or Portland cement.

10 . The construction material according to claim 1 , further comprising a hydroxide providing salt or compound in a ratio of 2:1 to 20:1 and preferably 5:1 to 16:1 relative to the combined weight of the silicon and fatty acid salt-based hydrophobisation agents, preferably the hydroxide providing salt or compound is an alkaline earth metal oxide or alkaline earth metal hydroxide or aluminium hydroxide, hydrated borate, hydrated phosphate, hydrated silicate, hydrated aluminosilicate, Portland cement or precipitated silica.

11 . 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.

12 . 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.

13 . 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 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.

14 . The 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 a hydroxide providing salt or compound and a silicon-based hydrophobisation agent in a ratio of 2:1 to 20:1 and optionally additional additives; (ii) shaping the construction material, and (iii) allowing the construction material to set.

15 . The method according to claim 14 , wherein the synergistically effective mixture in step (i) further comprises a fatty acid salt-based hydrophobisation agent or precursors of a fatty acid salt-based hydrophobisation agent.

16 . A method for the hydrophobisation of a construction material based on a mineral binder, comprising use of a synergistically effective mixture of a silicon-based hydrophobisation agent and a hydroxide providing salt or compound for said hydrophobisation to achieve an average total absorptivity measured according to EN520:2004, 5.9.2 of 10% or less and preferably 4% or less.

Assignees

• Knauf Gips Kg

Inventors

• Gajski Jakub
• Bogobowicz Agnieszka
• Foltynska Katarzyna

Classifications

• C04B28/14 Primary

  containing calcium sulfate cements {(gypsum-paper plates E04C)} · 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

• C04B22/064

  of the alkaline-earth metals · CPC title

• C04B22/066

  Magnesia; Magnesium hydroxide · CPC title

• C04B24/42

  Organo-silicon compounds · CPC title