Stabilizers for silicate paints
The invention relates to a silicate coating containing (A) at least one compound of the formula (I), where R 1 represents H, C 1 -C 4 -alkyl, CH 2 CH 2 OH, or CH 2 CH(CH 3 )OH, (B) at least one silicate binder, (C) if appropriate, one or more polymer binders, (D) if appropriate, further additives usual for the production of silica coatings, and (E) water.
1. A dispersion comprising
(A) at least one compound of the formula (I)
in which R 1 is C 1 -C 4 , alkyl, CH 2 CH 2 OH or CH 2 CH(CH 3 )OH,
(B) at least one silicate binder,
(C) at least one polymeric binder,
and
(E) water.
2. The dispersion as claimed in claim 1 , further comprising as component (D) one or more of the constituents selected from the group consisting of pigments, dispersants, defoamers, coalescents, rheological additives, biocides, wetting agents, and alkalis.
3. The dispersion as claimed in claim 1 , wherein R 1 is methyl or CH 2 CH 2 OH.
4. The dispersion as claimed in claim 1 , wherein R 1 is methyl.
5. The dispersion as claimed in claim 1 , wherein the concentration of the compound of the formula (I) is 0.01 to 10 wt %.
6. The dispersion as claimed in claim 1 , wherein the concentration of the compound of the formula (I) is 0.02% to 5%.
7. The dispersion as claimed in claim 1 , which comprises a quaternary ammonium compound.
8. The dispersion as claimed in claim 7 , in which the quaternary ammonium compound is selected from the group consisting of compounds of the formulae (II a) and (II b)
in which
R 3 , R 4 , R 5 , and R 8 independently of one another are C 1 -C 6 alkyl;
R 2 is C 1 -C 2 alkyl, CH 2 CH 2 OH or CH 2 CH(CH 3 )OH;
R 6 and R 7 independently of one another are H or C 1 -C 4 alkyl;
n, x and y independently of one another are a number between 1 and 10, and
X is an anion selected from the group consisting of halides, nitrites, nitrates, carbonates, phosphates, phosphonates, hydroxides, sulfates and sulfonates.
9. The dispersion as claimed in claim 8 , in which the compounds of the formula (I) and (II) are used in a ratio of 0.5:1 to 1:0.5.
10. The dispersion as claimed in claim 8 , in which the compounds of the formula (I) and (II) are used in a ratio of 0.75:1 to 1:0.75.
11. The dispersion as claimed in claim 1 , further comprising a white or chromatic pigment in an amount from 10 to 70 wt %.
12. The dispersion as claimed in claim 1 , further comprising wetting agents or dispersants in an amount from 0.01 to 10 wt %.
13. The dispersion as claimed in claim 1 , further comprising defoamers in an amount from 0.01 to 5 wt %.
14. The dispersion as claimed in claim 1 , further comprising biocides in an amount from 0.01 to 5 wt %.
15. The dispersion as claimed in claim 1 , further comprising coalescents in an amount from 0.01 to 5 wt %.
16. The dispersion as claimed in claim 1 , further comprising rheological additives in an amount from 0.1 to 10 wt %.
17. The dispersion as claimed in claim 1 , comprising the polymeric binder (C) in an amount from 0.01 to 70 wt %.
18. The dispersion as claimed in claim 1 , comprising the polymeric binder (C) in an amount from 0.5 to 50 wt %.
19. The dispersion as claimed in claim 1 , further comprising alkali in an amount from 0.01 to 10 wt %.
20. The dispersion as claimed in claim 1 , comprising 0.1 to 40 wt % of constituent (B).
21. The dispersion as claimed in claim 1 , comprising 0.5 to 25 wt % of constituent (B).
22. The dispersion as claimed in claim 1 , comprising 1 to 80 wt % of water.
23. The dispersion as claimed in claim 1 , in which the compound of formula (I) is prepared from glucose.
24. A method for stabilizing silicatic coating which comprises at least one silicate binder, at least one polymeric binder, and water, comprising the step of adding at least one compound of the formula (I)
in which R 1 is C 1 -C 4 , alkyl, CH 2 CH 2 OH or CH 2 CH(CH 3 )OH to the silicatic coating.
25. The method as claimed in claim 24 , in which the compound of the formula (I) is combined with at least one quaternary ammonium compound.
26. The method as claimed in claim 25 , in which the quaternary ammonium compound corresponds to the formula (II a) and/or (II b)
in which
R 3 , R 4 , R 5 , and R 8 independently of one another are C 1 -C 6 alkyl;
R 2 is C 1 -C 2 alkyl, CH 2 CH 2 OH or CH 2 CH(CH 3 )OH;
R 6 and R 7 independently of one another are H or C 1 -C 4 alkyl;
n, x and y independently of one another are a number between 1 and 10, and
X is an anion selected from the group consisting of halides, nitrites, nitrates, carbonates, phosphates, phosphonates, hydroxides, sulfates and sulfonates.
27. The method as claimed in claim 26 , in which the compounds of the formula (I) and (II) are used in a ratio of 0.5:1 to 1:0.5.
28. The method as claimed in claim 26 , in which the compounds of the formula (I) and (II) are used in a ratio of 0.75:1 to 1:0.75.