Chrome free and zinc-poor, anti-corrosive pigment mixture and method for the production and use thereof
Chromium-free, low-zinc, corrosion-inhibiting pigment mixture (A) comprising (a1) 30% to 60% by weight of at least one calcium hydrogen phosphate pigment, (a2) 15% to 45% by weight of at least one amorphous, calcium-modified silicon dioxide, (a3) 5% to 25% by weight of at least one calcium borosilicate pigment, and (a4) 1% to 15% by weight of at least one zinc salt of an organic nitro compound with the proviso that the zinc content of (A) does not exceed 10% by weight; process for preparing it, and its use.
1. A chromium-free, low-zinc, corrosion-inhibiting pigment mixture (A) comprising
(a1) 30% to 60% by weight of at least one calcium hydrogen phosphate pigment,
(a2) 15% to 45% by weight of at least one amorphous, calcium-modified silicon dioxide,
(a3) 5% to 25% by weight of at least one calcium borosilicate pigment, and
(a4) 1% to 15% by weight of at least one zinc salt of an organic nitro compound
with the proviso that the zinc content of (A) does not exceed 10% by weight.
2. The pigment mixture (A) of claim 1 , comprising 35% to 55% by weight of (a1).
3. The pigment mixture (A) of claim 1 , comprising 20% to 40% by weight of (a2).
4. The pigment mixture (A) of claim 1 , comprising 10% to 20% by weight of (a3).
5. The pigment mixture (A) of claim 1 comprising 3% to 12% by weight of (a4).
6. The pigment mixture (A) of claim 1 , its zinc content not exceeding 7% by weight.
7. A process for preparing the chromium-free, low-zinc, corrosion-inhibiting pigment mixture (A) of claim 1 , comprising mixing its constituents (a1), (a2), (a3), and (a4) with one another to give a separate pigment mixture (A), or mixing its constituents (a1), (a2), (a3), and (a4) with other substances, to give a pigment mixture (A) in situ.
8. Curable materials comprising the chromium-free, low-zinc, corrosion-inhibiting pigment mixture (A) of claim 1 .
9. The curable materials of claim 8 , curable physically, thermally, with actinic radiation, or a combination thereof.
10. The curable materials of claim 8 , wherein the curable materials are priming materials.
11. The curable materials of claim 10 , wherein the priming materials are at least one of primers, primer-surfacers, surfacers, or putties.
12. The curable materials of claim 8 , wherein the curable materials are two-component systems or multicomponent systems.
13. The curable materials of claim 12 , wherein the two-component systems or multicomponent systems comprise
(I) at least one component comprising isocyanate-reactive functional groups, and
(II) at least one component comprising at least one polyisocyanate.
14. Cured materials produced by curing the curable materials of claim 8 .
15. The cured materials of claim 14 , wherein the cured materials are prime coats or intermediate coatings.
16. The curable materials of claim 8 , used in automotive refinish.