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Korrosionsschutzpigment mit Kern-Huelle-Struktur

Anticorrosive pigment having core-shell structure, useful as component of anticorrosive coating material e.g. powder lacquer, comprises a core comprising metal particles/alloy, and a shell comprising inner-, intermediate- and outer-layers
 
: Brinkmann, A.; Zockoll, A.; Redetzky, M.; Stenzel, V.; Scharf, S.

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DE 102009028667 A: 20090819
DE 102009028667 A: 20090819
C09C0001
German
Patent, Electronic Publication
Fraunhofer IFAM ()

Abstract
(A1) Die vorliegende Erfindung betrifft ein Korrosionsschutzpigment mit einer Kern-Huelle-Struktur, umfassend (I) einen Kern, umfassend oder bestehend aus einem oder mehreren Metall-Partikeln, und (II) eine den (I) Kern umschliessende und an die aeussere Oberflaeche des (I) Kerns gebundene Huelle, die auf ihrer Aussenseite hydrophobe Gruppen besitzt, wobei die (II) Huelle umfasst oder besteht aus - einer inneren, den (I) Kern umschliessenden und an die aeussere Oberflaeche des (I) Kerns gebundenen Schicht (A), - einer aeusseren Schicht (C) - sowie optional einer oder mehreren Zwischenschichten (Bn), angeordnet zwischen der inneren Schicht (A) und der aeusseren Schicht (C).

 

DE 102009028667 A1 UPAB: 20110331 NOVELTY - Anticorrosive pigment having a core-shell structure comprises: (a1) a core (I) comprising one or more metal particles, where the metal includes a metallic element of magnesium (Mg), zinc (Zn) or aluminum (Al) or a metal alloy with a main component of Mg, Zn or Al; and (b1) a shell (II) (that surrounds the core and has hydrophobic groups to its exterior) comprising an inner layer (A) that surrounds the core and is bound to the outer surface of the core, an outer layer (C) and optionally one or more intermediate layers (Bn) arranged between the inner and outer layers. DETAILED DESCRIPTION - Anticorrosive pigment having a core-shell structure comprises: (a1) a core (I) comprising one or more metal particles, where the metal includes a metallic element of magnesium (Mg), zinc (Zn) or aluminum (Al) or a metal alloy with a main component of Mg, Zn or Al; and (b1) a shell (II) (that surrounds the core, is bound to the outer surface of the core and has hydrophobic groups to its exterior) comprising an inner layer (A) that surrounds the core and is bound to the outer surface of the core, an outer layer (C) and optionally one or more intermediate layers (Bn) arranged between the inner and outer layers. INDEPENDENT CLAIMS are included for: (1) a powder comprising many anticorrosive pigments and optionally one or more additives; (2) an anticorrosive coating material comprising 20-98 wt.% of the above anticorrosive pigments, 2-60 wt.% of binder (including epoxide resin, polyurethane, acrylate, alkyd resin, formaldehyde condensation resin, polyester, polyether, polyethylene and polyvinyl chloride), 0-70 wt.% of inorganic solvent (including alcohol, glycol, ketone, ester and ether), 0-40 wt.% of water, and optionally one or more additives, preferably defoamer, deaerator, corrosion inhibitors, thickeners, dispersing agents, moistening agents, hydrophobic additives, reactive diluents, dewatering agents and wetting agents; (3) preparing the anticorrosive pigments, comprising (aa) providing the core, (bb) providing and binding a compound (Ia) to the surface of the core to form the inner layer of the shell, where the inner layer surrounds the core and bounds to the surface of the core, (cc) optionally providing and binding a compound (IIa) to the exterior of the inner layer or an intermediate layer (Bn-1) to form the intermediate layer (Bn) of the shell, and (dd) providing and binding hydrophobic group-containing compounds (IIIa) to the exterior of the inner layer or to the intermediate layer (Bn) to form the outer layer in which the hydrophobic groups are arranged on the side turned away from the core; and (4) improving the corrosion resistance of a metal, comprising applying the above anticorrosive coating material to the surface of the metal. USE - The anticorrosive pigment is useful as a component of an anticorrosive coating material, preferably powder lacquer or an aqueous coating agent for metals, preferably a water-dilutable lacquer (claimed). ADVANTAGE - The storage-stable, water-based anticorrosive pigment provides long lasting protection to metal from unwanted, premature corrosive reactions.

: http://publica.fraunhofer.de/documents/N-159210.html