Abstract:
The invention relates to a method for producing a pigment paste by mixing at least one pigment, consisting of solid particles, with a grind resin in the presence of water and/or an organic liquid, wherein the grind resin comprises a dispersion of core-shell particles in an epoxide prepolymer which is liquid at 20° C., or consists of such a dispersion, and the core-shell particles have a silicone core and a polymer shell.The invention also relates to an aqueous electrocoat material, to the use thereof, to a method for cataphoretic electrocoating, and to a coated article.
Abstract:
The present invention relates to a method for at least partly coating an electrically conductive substrate with an electrocoat material, comprising at least contacting the substrate with an aqueous coating composition (A) as step (1), which is carried out in at least two successive stages (1a) and (1b), i.e., first at an applied voltage in a range from 1 to 50 V (1a), which is applied over a duration of at least 5 seconds, and then in a range from 50 to 400 V (1b), the voltage applied in (1b) being greater by at least 10 V than the voltage applied in (1a), with (A) comprising at least one cathodically depositable binder (A1), at least one organic monocarboxylic or polycarboxylic acid which has no nitrogen atom(s), and/or anions thereof (A3) and trivalent bismuth (A4), with (A3) and (A4) each being present in (A) in an amount such that their stoichiometry to one another allows at least 50 mol % of (A4) to be present in the form of a salt and/or complex of components (A3) and (A4), with the molar fractions of any zirconium ions and aminopolycarboxylic acids present in (A) to be lower by a factor in each case of 100 or of 15, respectively, than the molar fraction of (A4) present in (A); to a use of (A) for at least partly coating the substrate with an electrocoat material; to at least partly coated electrically conductive substrates obtainable by the method; and to articles or components produced from such substrates.
Abstract:
The present invention relates to a method for at least partly coating a metallic substrate, at least comprising at least partly coating the substrate with an autophoretically depositable coating composition (step (1)) and contacting, with an aqueous sol-gel composition, the substrate at least partly coated with the autophoretically deposited coating composition (step (2)), to an at least partly coated substrate obtainable by this method, and to the use of an aqueous sol-gel composition for aftertreating a coating composition applied to a substrate at least partly by autophoretic deposition, by contacting the autophoretically deposited coating composition with the aqueous sol-gel composition.