Organically modified siloxanes and their use for producing preparations for water-repellent impregnations
View Patent ↗The invention relates to organomodified siloxane compounds of the general formula (I) the use of at least one of these compounds for producing aqueous preparations for the water-repellent impregnation of organic or inorganic materials.
1. An organomodified siloxane compound of the general formula (I),
where
the radicals R 1 are identical or different radicals selected from the group consisting of linear or branched, saturated or monounsaturated or polyunsaturated alkyl, aryl, alkylaryl, arylalkyl and haloalkyl groups having from 1 to 20 carbon atoms,
the radicals R 2 are identical or different organic radicals which have from 1 to 20 carbon atoms and may contain heteroatoms,
the radicals R 3 are organic radicals having carboxylic ester functions as shown in the formula (II),
where
the radicals R 6 are identical or different linear or branched, saturated or monounsaturated or polyunsaturated alkyl, aryl, alkylaryl or arylalkyl radicals having from 1 to 20 carbon atoms and
the radicals R 7 are identical or different linear or branched, saturated or monounsaturated or polyunsaturated alkyl, aryl, alkylaryl or arylalkyl radicals having from 1 to 20 carbon atoms and
q is from 0 to 11,
the radicals R 4 are each, independently of one another, R 1 , —R 2 —Si(R 5 ) 3 or R 3 ,
the radicals R 5 are identical or different, saturated or unsaturated alkyl, alkoxy, aryl or aryloxy radicals having from 1 to 20 carbon atoms, with the proviso that at least one radical R 5 is an alkoxy group,
n is from 1 to 200,
m is from 0 to 20, with the proviso that m is 0 only when R 4 is the radical —R 2 —Si(R 5 ) 3 and otherwise m≧1,
o is from 1 to 20,
r is from 0 to 100,
s is from 0 to 5,
where the units denoted by the indices m, n, o, r and s can be distributed in any order in the compounds.
2. The compound of claim 1 , characterized in that an average of ≧90% of the radicals R 1 are methyl groups and R 2 is an alkylene radical having from 1 to 5 carbon atoms.
3. The compound of claim 1 , characterized in that o has a value of from 1 to 5.
4. The compound of claim 1 , characterized in that all radicals R 5 are methoxy and/or ethoxy groups.
5. The compound according to claim 1 , characterized in that n has a value of from 5 to 100.
6. The compound of claim 1 , characterized in that q has a value of from 0 to 8.
7. The compound of claim 1 , characterized in that m has a value of from 0 to 10.
8. The compound of claim 1 , characterized in that the compounds have an average proportion of methanol and/or ethanol radicals of ≦10% by weight, based on the weight average molecular weight of the siloxane compounds.
9. The compound of claim 8 , have an average proportion of methanol and/or ethanol radicals from 5 to 10% by weight, based on the weight average molecular weight of the siloxane compounds.
10. The compound of claim 1 , wherein:
an average of ≧90% of the radicals R 1 are methyl groups;
R 2 is an alkylene radical having from 1 to 5 carbon atoms;
all radicals R 5 are methoxy and/or ethoxy groups;
m has a value of from 0 to 10;
n has a value of from 5 to 100;
o has a value of from 1 to 5;
q has a value of from 0 to 8; and
have an average proportion of methanol and/or ethanol radicals from 5 to 10% by weight, based on the weight average molecular weight of the siloxane compounds.
11. A method for producing aqueous preparations for the water-repellent impregnation of inorganic or organic substrates which comprises adding the compounds of claim 1 to an aqueous preparation.
12. A method for producing aqueous preparations for the water-repellent impregnation of porous mineral building materials which comprises adding the compounds of claim 1 to an aqueous preparation.
13. An aqueous preparation for the water-repellent impregnation of inorganic or organic substrates, which comprise
a) from 10 to 80 parts by weight of compounds according to claim 1 ,
b) from 0.5 to 10 parts by weight of an emulsifier or emulsifier mixture and
c) water.
14. The aqueous preparation according to claim 13 , characterized in that it contains from 0 to 0.5 part by weight of preservative.
15. The aqueous preparation according to claim 13 , characterized in that the proportion of water is from 10 to 89.5 parts by weight.
16. The aqueous preparation according to claim 13 , characterized in that they comprise
a) from 10 to 80% by weight of compounds according to claim 8 ,
b) from 0.5 to 10% by weight of an emulsifier or emulsifier mixture,
c) from 10 to 89.5% by weight of water and, if appropriate,
d) from 0 to 0.5% by weight of preservative.
17. A composition comprising a mixture of the organomodified siloxane compounds of claim 1 .