Sol-gel coating from water-soluble oxalamides
View Patent ↗Coating compositions for producing sol-gel coatings that include: a) one or more alkoxysilyl-containing oxalamides of the general formula (II), where R″ is hydrogen or an organic C 1 -C 10 radical, R′ radicals are organic, optionally oxygen-attached C 1 -C 10 radicals, R is an oxygen-attached radical optionally containing one or more ether groups and having 1 to 30 carbon atoms and n is an integer between 0 and 2, b) optionally further crosslinkers, c) one or more catalysts and d) water. The sol-gel coatings are produced by a method that includes combining a silica sol and one or more alkoxysilyl-containing oxalamides. The sol-gel coatings obtained from the above-described coating compositions can be used to coat substrates.
1. A method of producing sol-gel coatings comprising combining a silica sol and one or more alkoxysilyl-containing oxalamides.
2. The method according to claim 1 , further comprising combining optionally further crosslinkers, one or more catalysts and water.
3. The method according to claim 2 , wherein the further crosslinkers include water-soluble or water-emulsifiable alkoxysilanes, water-soluble or water-emulsifiable organic polymers and/or aqueous or alcoholic silica sols.
4. The method according to claim 2 , wherein the catalyst includes p-toluenesulphonic acid.
5. The method according to claim 1 , wherein the one or more alkoxysilyl-containing oxalamides corresponds to the general formula (II),
where
R″ is hydrogen or an organic C 1 -C 10 radical,
R′ radicals are organic, optionally oxygen-attached C 1 -C 10 radicals,
R is an oxygen-attached radical optionally containing one or more ether groups and having 1 to 30 carbon atoms and
n is an integer between 0 and 2.
6. The method according to claim 5 , wherein the oxalamides are of the stated formula (II) where
R″ is hydrogen,
R′ is an optionally oxygen-attached methyl or ethyl group,
R is methoxy and
n is 0 or 1.
7. 501-gel coatings obtained from the method of claim 1 .
8. Substrates coated with sol-gel coatings according to claim 7 .
9. Coating compositions for producing sol-gel coatings comprising
a) one or more alkoxysilyl-containing oxalamides of the general formula (II),
where
R″ is hydrogen or an organic C 1 -C 10 radical,
R′ radicals are organic, optionally oxygen-attached C 1 -C 10 radicals,
R is an oxygen-attached radical optionally containing one or more ether groups and having 1 to 30 carbon atoms and
n is an integer between 0 and 2,
b) optionally further crosslinkers,
c) one or more catalysts and
d) water.
10. Coating compositions for producing sol-gel coatings according to claim 9 , wherein the oxalamides of component A) are of the stated formula (II) where
R″ is hydrogen,
R′ is an optionally oxygen-attached methyl or ethyl group,
R is methoxy and
n is 0 or 1.
11. Coating compositions for producing sol-gel coatings according to claim 10 , wherein the further crosslinkers in component b) include water-soluble or water-emulsifiable alkoxysilanes, water-soluble or water-emulsifiable organic polymers and/or aqueous or alcoholic silica sols.
12. Coating compositions for producing sol-gel coatings according to claim 10 , wherein the catalyst c) includes p-toluenesulphonic acid.
13. Coating compositions for producing sol-gel coatings according to claim 9 , wherein the further crosslinkers in component b) include water-soluble or water-emulsifiable alkoxysilanes, water-soluble or water-emulsifiable organic polymers and/or aqueous or alcoholic silica sols.
14. Coating compositions for producing sol-gel coatings according to claim 13 , wherein the catalyst c) includes p-toluenesulphonic acid.
15. Coating compositions for producing sol-gel coatings according to claim 9 , wherein the catalyst c) includes p-toluenesulphonic acid.
16. Sol-gel coating obtained from coating compositions according to claim 9 .
17. Substrates coated with sol-gel coatings according to claim 16 .
18. The coating compositions according to claim 9 , further comprising auxiliaries and additives selected from the group consisting of leveling assistants, light stabilizers, UV absorbers, pigments, dyes, and combinations thereof.
19. Sol-gel coatings obtained from combining a silica sol and one or more alkoxysilyl-containing oxalamides.
20. Substrates coated with sol-gel coatings according to claim 19 .