Method for applying corrosion protection layers comprising thioamides to metallic surfaces
AssigneeBASF SE
InventorsMonica Fernandez Gonzalez, Markus Hickl, Cordula Mock-Knoblauch, Manfred Essig, Ingolf Hennig, Alexander Goethlich
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Abstract
Process for applying integrated pretreatment layers to metallic surfaces, particularly the surfaces of coil metals, by treatment with a composition comprising at least one binder, crosslinker, a finely divided inorganic filler, and compounds containing at least two thioamide groups or containing one thioamide group and at least one functional group. Integrated pretreatment layer obtainable by the process.
Claims28
A process for applying a corrosion preventive layer to a metallic surface comprising treating said surface with a formulation comprising a binder, a pigment and/or a filler and a corrosion preventive agent, wherein said corrosion preventive agent is at least one compound containing thioamide groups of the general formula (I) —C(S)NR1R2, selected from the group of
- (D1) thioamides of the general formula (II) R4n—R3—C(S)NR1R2, and
- (D2) thioamides containing at least 2 thioamide groups,
- wherein n is a natural number from 1 to 5, and the radicals R1, R2, R3 and R4 have the following definitions:
- R1 and R2 each independently are H or a linear or branched, optionally substituted, alkyl radical having 1 to 20 carbon atoms,
- R3 is an (n+1)-valent hydrocarbon radical having 1 to 30 carbon atoms, and
- R4 is a functional group.
A process for applying an integrated pretreatment layer to a metallic surface, comprising the steps of
- (1) treating the metallic surface with a crosslinkable formulation comprising at least
- (A) a binder,
- (B) crosslinkable components, which can be crosslinkable groups connected to the binder and/or can be at least one additionally employed crosslinker,
- (C) a pigment and/or filler,
- (D) a corrosion preventative, and
- (E) optionally a solvent, and
- (2) crosslinking the applied layer,
- wherein
- the amount of binder is from 20 to 70% by weight,
- the filler comprises from 20 to 70% by weight of at least one finely divided inorganic filler having an average particle size of less than 10 μm, and
- the corrosion preventative comprises from 0.25 to 10% by weight of at least one compound containing thioamide groups of the general formula (I) —C(S)NR1R2 and selected from the group consisting of
- (D1) thioamides of the general formula (II) R4n—R3—C(S)NR1R2, and
- (D2) thioamides containing at least 2 thioamide groups,
- wherein n is a natural number from 1 to 5 and the radicals R1, R2, R3 and R4 have the following definitions:
- R1 and R2 independently of one another are H or a linear or branched, optionally substituted, alkyl radical having 1 to 20 carbon atoms,
- R3 is an (n+1)-valent hydrocarbon radical having 1 to 30 carbon atoms, and
- R4 is a functional group,
- with the proviso that the percentages by weight are based on the sum of all of the components bar the solvent.
A formulation for applying a corrosion preventive layer to a metallic surface, comprising at least one binder, one pigment and/or one filler and one corrosion preventive agent, wherein said corrosion preventive agent is a compound containing at least one thioamide group of the general formula (I) —C(S)NR1R2, selected from the group of
- (D1) thioamides of the general formula (II) R4n—R3—C(S)NR1R2, and
- (D2) thioamides containing at least 2 thioamide groups,
- wherein n is a natural number from 1 to 5, and the radicals R1, R2, R3 and R4 have the following definitions:
- R1 and R2 each independently are H or a linear or branched, optionally substituted, alkyl radical having 1 to 20 carbon atoms,
- R3 is an (n+1)-valent hydrocarbon radical having 1 to 30 carbon atoms, and
- R4 is a functional group.
A formulation for applying integrated pretreatment layers to metallic surfaces, comprising the following components:
- (A) a binder,
- (B) crosslinkable components, which can be crosslinkable groups connected to the binder and/or can be at least one additionally employed crosslinker,
- (C) a pigment and/or filler,
- (D) a corrosion preventative, and
- (E) optionally a solvent,
- wherein
- the amount of the binder is from 20 to 70% by weight,
- the filler comprises from 20 to 70% by weight of at least one finely divided inorganic filler having an average particle size of less than 10 μm, and
- the corrosion preventative comprises from 0.25 to 10% by weight of at least one compound containing thioamide groups of the general formula (I) —C(S)NR1R2 and selected from the group consisting of
- (D1) thioamides of the general formula (II) R4n—R3—C(S)NR1R2, and
- (D2) thioamides containing at least 2 thioamide groups,
- wherein n is a natural number from 1 to 5 and the radicals R1, R2, R3 and R4 have the following definitions:
- R1 and R2 independently of one another are H or a linear or branched, optionally substituted, alkyl radical having 1 to 20 carbon atoms,
- R3 is an (n+1)-valent hydrocarbon radical having 1 to 30 carbon atoms, and
- R4 is a functional group,
- the percentages by weight being based on all of the components bar the solvent.
Dependencies are inferred from the claim text.