Hydrophobizing construction elements comprising mineral fibers
View Patent ↗Water repellents based on reactive siloxanes with polyfunctional silylalkoxy modification of the siloxane backbone and processes for hydrophobizing mineral fiber components.
1. A process for hydrophobizing mineral fiber components, characterized in that, in the production of the mineral fiber components, siloxanes of the general Formula (I) are added
M a M′ b D c D′ d D alkoxy e T f Q g (I)
in which
M=(R 1 3 SiO 1/2 ),
M′=(R 1 2 R 2 SiO 1/2 )
D=(R 1 2 SiO 2/2 ),
D′=(R 1 R 3 SiO 2/2 ),
D alkoxy =(R 1 R 4 SiO 2/2 ),
T=(R 1 SiO 3/2 ),
Q=(SiO 4/2 )
a=0-22,
b=0-22,
c=5-400,
d=0-20,
e=0-40,
f=0-10,
g=0-10,
with the proviso that a+b is greater than or equal to 2 and b+e is greater than or equal to 2,
R 1 =identical or different, aliphatic or aromatic hydrocarbon radicals which optionally have ether functions and/or ester functions and optionally carry halogen atoms,
R 2 =identical or different radicals from the group R 3 , R 4 ,
for e less than or equal to 1, R 2 =R 4 ,
R 3 =identical or different polyether radicals or H,
R 4 =identical or different radicals of the general Formula (III)
—(CH 2 ) k —Si(R 6 ) l (OR 6 ) 3-l (III)
k=2-12,
l=0-2,
R 6 =identical or different alkyl or aryl radicals.
2. The process according to claim 1 , in which
a=0-10, b=0-10, c=10-200, d=0-10, e=0-30, f=0-4, g=0-4.
3. The process according to claim 1 , in which
a=0-2, b=0-2, c=15-150, d=0, e=0-20, f=0, g=0.
4. The process according to claim 1 , in which
R 1 =identical or different, aliphatic or aromatic hydrocarbon radicals having 1 to 20 carbon atoms or H.
5. The process according to claim 4 , in which R 1 =methyl, phenyl or H.
6. The process according to claim 1 , in which
R 3 =identical or different polyether radicals of the general Formula (II) or H,
—CH 2 CH 2 CH 2 h —O CH 2 CH 2 O i — CH 2 CH(CH 3 )O j —R 5 (II)
h=0-10, i=0-60, j=0-60 and i+j is greater than or equal to 3, and
R 5 =corresponds to identical or different radicals from the group consisting of alkyl, aryl, H or —C(O)R 6 .
7. The process according to claim 6 , in which
h=1, i=0-40, j=0-40, i+j is greater than or equal to 3 and R 5 ═H, methyl, ethyl, phenyl or acetyl.
8. The process according to claim 1 , in which
k=2-3, l=0-1 and R 6 =methyl, ethyl, propyl, butyl or phenyl.
9. The process according to claim 1 , in which
k=2, l=0 and R 6 =methyl or ethyl.
10. The process according to claim 1 , characterized in that the water repellent of the Formula (I) is added in pure form, as a solution or as an emulsion to the binder solution or is applied via a separate spray apparatus.
11. Hydrophobized mineral fibers, produced by one of the processes according to claim 1 .
12. Hydrophobized mineral fiber components according to claim 11 , comprising
30-75% by weight of mineral fibers,
20-40% by weight of clay and
3-4% by weight of starch and
optionally, fiber component constituents, loading materials and auxiliaries.