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US 2017/0240468 A1Published application
A process for hydrophobization of concrete
AssigneeBASF SE
InventorsUwe GEHRIG, Alexander ASSMANN, Klaus SEIP, Martin PICHLER, Torben GÄDT
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Abstract
The invention relates to a process for hydrophobization of concrete or mortar using an alkylketene dimer dispersion and to the concrete or mortar obtainable by the process of the invention. The process allows to achieve 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 aqueous alkylketene 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, or the alkylketene dimer in solid form;
- (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 aqueous alkylketene dimer dispersion to the surface of the hardened cement.
9 more elements
A process comprising hydrophobizing concrete or mortar 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.
4 more elements
Dependencies are inferred from the claim text.