Sprayable composition, its use and method for sealing openings or gaps in building components
Described is a sprayable, stable composition containing at least one organopolysiloxane containing hydroxyl groups and/or hydrolyzable groups, at least one cross-linking agent on the basis of a functionalized silane, at least one filler on the basis of silicon dioxide, and at least one condensation catalyst, the use of said composition as a coating, and a method for sealing openings or gaps in building components.
1. A sprayable, stable composition containing
at least one organopolysiloxane containing hydroxyl groups, hydrolyzable groups, or both,
at least one cross-linking agent on the basis of a functionalized silane,
at least one filler on the basis of silicon dioxide, and
at least one condensation catalyst,
wherein the composition is free of water and solvents, and
wherein the individual components in the composition are mixed and homogenized in one pot.
2. The composition as in claim 1 , wherein the composition has a dynamic viscosity of a maximum of 10,000 mPa·s (Brookfield DV-I+; Spindle 6; 25° C.; 100 rpm).
3. The composition as in claim 1 , wherein the at least one organopolysiloxane has a dynamic viscosity of a maximum of 10,000 mPa·s (Brookfield DV-II+; 25° C.; 100 rpm).
4. The composition as in claim 1 , wherein the at least one organopolysiloxane comprises one hydroxyl group on each chain end and does not contain any additional hydroxyl groups and hydrolyzable groups.
5. The composition as in claim 1 , wherein the cross-linking agent on the basis of a functionalized silane is selected from among organo-functional silanes.
6. The composition as in claim 5 , wherein the cross-linking agent is a combination of two or more organofunctional silanes of differing functionality.
7. The composition as in claim 1 , wherein the filler based on silicon dioxide is selected from the group comprising colloidal, pyrogenic, and precipitated silicic acid or a combination thereof.
8. The composition as in claim 7 , wherein the filler on the basis of silicon dioxide is surface-treated.
9. The composition as in claim 1 , wherein the composition contains a silicate-free filler.
10. The composition as in claim 9 , wherein the silicate-free filler is selected from the group comprising carbonates, pyrogenic, and/or precipitated metal and/or half metal oxides or hydroxides or mixed oxides thereof, with the exception of silicon compounds, sulfates, carbides, nitrides, carbon modifications, natural non-silicate minerals, or carbon types or a combination thereof.
11. The composition as in claim 9 , wherein the silicate-free filler is surface-treated.
12. The composition as in claim 1 , wherein the composition contains at least one additional organopolysiloxane that is free of hydroxyl groups, hydrolyzable groups, or both.
13. The composition as in claim 12 , wherein the one additional organopolysyloxane has a dynamic viscosity of 10 to 500 mPa·s (measured according to Brookfield DV-II+; 25° C.; 100 rpm).
14. The composition as in claim 1 , wherein the composition contains an adhesion promoter.
15. A method for sealing an opening or a gap in building components comprising the steps of:
(a) filling the opening or the gap with a carrier material,
(b) spraying a coating of a composition as in claim 1 , and
(c) allowing the coating to cure.
16. The method as in claim 15 , wherein the carrier material is selected from the group consisting of mineral wool, rock wool, glass wool, glass fibers, fiber glass or ceramic fibers, or a combination thereof.