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US 10,882,960 B2Granted
Method for the hydrophobic impregnation of fired ceramic molded bodies
AssigneeWacker Chemie AG
InventorsHartmut Ackermann, Rudolf Hager
Life of this patent
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Abstract
Fired clay moldings are hydrophobicized by applying a long chain alkyl-substituted alkoxysilane or hydrolysate thereof having up to 5 silicon atoms, and an alkoxy-functional silicone resin. The moldings, which may be roof tiles, are hydrophobicized to a significant depth, without discoloration.
Claims13
A process for the hydrophobizing impregnation of fired clay moldings, comprising treating the fired clay moldings with an aqueous composition comprising:
- (A) at least one silane of the formula
- RaR1Si(OR2)3-a (I),
- in which
- R each independently, are monovalent, SiC-bonded hydrocarbon moieties having from 1 to 5 carbon atoms,
- R1 each independently, are monovalent, SiC-bonded hydrocarbon moieties having from 6 to 22 carbon atoms,
- R2 each independently, are hydrogen or monovalent hydrocarbon moieties and a is 0 or 1,
- and/or partial hydrolysates of the silanes of formula (I) which have at most 5 silicon atoms in the partial hydrolysate,
- (B) at least one siloxane (B2) comprising at least 10 siloxy units of the formula
- R3bR4c(OR5)dSiO(4-b-c-d)/2 (II),
- where
- R3 each independently, are monovalent, SiC-bonded, nitrogen-containing hydrocarbon moieties,
- R4 each independently, are monovalent, SiC-bonded hydrocarbon moieties which are unsubstituted or have halogen atoms as substituents,
- R5 each independently, are hydrogen or a monovalent hydrocarbon moieties,
- b is 0, 1, 2 or 3,
- c is 0, 1, 2 or 3 and
- d is 0, 1, 2 or 3,
- with the provisos that b+c+d≤3, that in at least one unit b is not 0, and in at least 50% of all of the units of the formula (II) in the siloxane (B2) b+c is equal to 2,
- (C) acid,
- (D) optionally, emulsifier(s),
- (E) water, and
- (F) optionally, other substances,
- wherein the aqueous composition is produced by, in a first step, homogeneously mixing the components (A), (B2), (C) and optionally (D) in a mixer and then heating to a temperature of from 60 to 140° C. for from 0.5 to 4 hours, and in a second step emulsifying the mixture obtained in the first step with water (E), optionally (D) and optionally (F).
19 more elements
A process for the hydrophobizing impregnation of fired clay moldings, comprising treating the fired clay moldings with an aqueous composition comprising:
- (A) at least one silane of the formula
- RaR1Si(OR2)3-a (I)
- in which
- R each independently, are monovalent, SiC-bonded hydrocarbon moieties having from 1 to 5 carbon atoms,
- R1 each independently, are monovalent, SiC-bonded hydrocarbon moieties having from 6 to 22 carbon atoms,
- R2 each independently, are hydrogen or monovalent hydrocarbon moieties and a is 0 or 1,
- and/or partial hydrolysates of the silanes of formula (I) which have at most 5 silicon atoms in the partial hydrolysate,
- (B) at least one siloxane (B2) comprising at least 10 siloxy units of the formula
- R3bR4c(OR5)dSiO(4-b-c-d)/2 (II)
- where
- R3 each independently, are monovalent, SiC-bonded, nitrogen-containing hydrocarbon moieties,
- R4 each independently, are monovalent, SiC-bonded hydrocarbon moieties which are unsubstituted or have halogen atoms as substituents,
- R5 each independently, are hydrogen or monovalent hydrocarbon moieties,
- b is 0, 1, 2 or 3,
- c is 0, 1, 2 or 3 and
- d is 0, 1, 2 or 3,
- with the provisos that b+c+d≤3, that in at least one unit b is not 0, and in at least 50% of all of the units of the formula (II) in the siloxane (B2) b+c is equal to 2,
- (C) acid,
- (E) water, and
- (F) optionally, other substances,
- wherein the aqueous composition is free from emulsifiers.
18 more elements
A process for the hydrophobizing impregnation of fired clay moldings, comprising treating the fired clay moldings with an aqueous composition comprising:
- (A) at least one silane of the formula
- RaR1Si(OR2)3-a (I)
- in which
- R each independently, are monovalent, SiC-bonded hydrocarbon moieties having from 1 to 5 carbon atoms,
- R1 each independently, are monovalent, SiC-bonded hydrocarbon moieties having from 6 to 22 carbon atoms,
- R2 each independently, are hydrogen or monovalent hydrocarbon moieties and
- a is 0 or 1,
- and/or partial hydrolysates of the silanes of formula (I) which have at most 5 silicon atoms in the partial hydrolysate,
- (B) at least one siloxane (B2) comprising at least 10 siloxy units of the formula
- R3bR4c(OR5)dSiO(4-b-c-d)/2 (II)
- where
- R3 each independently, are monovalent, SiC-bonded, nitrogen-containing hydrocarbon moieties,
- R4 each independently, are monovalent, SiC-bonded hydrocarbon moieties which are unsubstituted or have halogen atoms as substituents,
- R5 each independently, are hydrogen or monovalent hydrocarbon moieties,
- b is 0, 1, 2 or 3,
- c is 0, 1, 2 or 3 and
- d is 0, 1, 2 or 3,
- with the provisos that b+c+d≤3, that in at least one unit b is not 0, and in at least 50% of all of the units of the formula (II) in the siloxane (B2) b+c is equal to 2,
- (C) acid,
- (D) optionally, emulsifier(s),
- (E) water, and
- (F) optionally, other substances,
- wherein component (F) is selected from the group consisting of thickeners, organosilicon compounds other than components (A) and (B2), substances for adjusting pH, fragrances, dyes, colored pigments, alcohols, and antifreezes, and no components other than components (A) through (F) are present.
20 more elements
A process for the hydrophobizing impregnation of fired clay moldings, comprising treating the fired clay moldings with an aqueous composition consisting essentially of:
- (A) at least one silane of the formula
- RaR1Si(OR2)3-a (I)
- in which
- R each independently, are monovalent, SiC-bonded hydrocarbon moieties having from 1 to 5 carbon atoms,
- R1 each independently, are monovalent, SiC-bonded hydrocarbon moieties having from 6 to 22 carbon atoms,
- R2 each independently, are hydrogen or monovalent hydrocarbon moieties and
- a is 0 or 1,
- and/or partial hydrolysates of the silanes of formula (I) which have at most 5 silicon atoms in the partial hydrolysate,
- (B) at least one siloxane (B2) comprising at least 10 siloxy units of the formula
- R3bR4c(OR5)dSiO(4-b-c-d)/2 (II)
- where
- R3 each independently, are monovalent, SiC-bonded, nitrogen-containing hydrocarbon moieties,
- R4 each independently, are monovalent, SiC-bonded hydrocarbon moieties which are unsubstituted or have halogen atoms as substituents,
- R5 each independently, are hydrogen or monovalent hydrocarbon moieties,
- b is 0, 1, 2 or 3,
- c is 0, 1, 2 or 3 and
- d is 0, 1, 2 or 3,
- with the provisos that b+c+d≤3, that in at least one unit b is not 0, and in at least 50% of all of the units of the formula (II) in the siloxane (B2) b+c is equal to 2,
- (C) acid,
- (D) optionally, emulsifier(s),
- (E) water, and
- (F) other substances selected from the group consisting of thickeners, organosilicon compounds other than components (A) and (B2), substances for adjusting pH, fragrances, dyes, colored pigments, alcohols, and antifreezes.
19 more elements
Dependencies are inferred from the claim text.