Process for hydrophobization of concrete
AssigneeBASF SE
InventorsUwe Gehrig, Alexander Assmann, Klaus Seip, Martin Pichler, Torben Gädt
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Abstract
A process for hydrophobization of concrete or mortar using an aqueous dispersion containing an alkylketene dimer, at least one emulsifier and a condensation product of phenol sulfonic acid and formaldehyde, naphthalene sulfonic acid and formaldehyde, or naphthalene sulfonic acid, phenol, formaldehyde and urea; and the concrete or mortar obtainable by the process. The process allows effective mass and surface hydrophobization of concrete.
Claims15
A process for preparing hydrophobized concrete or mortar comprising the steps of
- (A) providing a cement slurry suitable for concrete or mortar preparation;
- (B1) adding an alkylketene dimer in at least one of solid form or aqueous dispersion, the alkylketene dimer comprising
- (a) an alkylketene dimer of the formula (I)
- and/or of the formula (II)
- in which
- R1 and R2 are identical or different hydrocarbon radicals comprising 10 to 24 carbon atoms;
- (b) at least one emulsifier having a nitrogen content of ≤1% by weight selected from the group consisting of a starch, cellulose, starch derivative or cellulose derivative;
- (c) a condensation product of phenol sulfonic acid and formaldehyde, naphthalene sulfonic acid and formaldehyde or naphthalene sulfonic acid, phenol, formaldehyde and urea wherein the sulfonic acid groups may optionally be present in protonated or deprotonated or partly in protonated and partly in deprotonated form;
- wherein the dispersion has a charge density in the range from −5 to −150 μeq/g;
- and allowing the cement slurry to harden
- or
- (B2) allowing the cement slurry of step (A) to harden and applying said alkylketene dimer in aqueous dispersion to the surface of the hardened cement.
A process comprising hydrophobizing concrete or mortar, by addition or application thereto, utilizing an aqueous alkyl ketene dimer dispersion comprising
- (a) an alkylketene dimer of the formula (I)
- and/or of the formula (II)
- in which
- R1 and R2 are identical or different hydrocarbon radicals comprising 10 to 24 carbon atoms;
- (b) at least one emulsifier having a nitrogen content of ≤1% by weight selected from the group consisting of a starch, cellulose, starch derivative or cellulose derivative;
- (c) a condensation product of phenol sulfonic acid and formaldehyde, naphthalene sulfonic acid and formaldehyde or naphthalene sulfonic acid, phenol, formaldehyde and urea wherein the sulfonic acid groups may optionally be present in protonated or deprotonated or partly in protonated and partly in deprotonated form;
- wherein the dispersion has a charge density in the range from −5 to −150 μeq/g.
Dependencies are inferred from the claim text.