Anode for cathodic electrocoating
AssigneeBASF SE
InventorsKlaus Boehlke, Fritz E. Kempter
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Abstract
Novel anodes consist of a mixture of from 30 to 95% by weight of nagnetite, lead dioxide, magnetite/natural graphite mixture or lead dioxide/natural graphite mixture and from 70 to 5% by weight of a plastic. They may be used for the surface-coating of metallic substrates by cathodic electrocoating.
Claims14
An anode for cathodic electrocoating, which comprises a mixture of
- (A) from 60 to 90% by weight of magnetite or a magnetite/natural graphite mixture and
- (B) from 40 to 10% by weight of a plastic.
A process for producing an anode for the electrocoating of metallic substrates in which the substrate, which has been made the cathode, and the anode are dipped into an aqueous bath which contains a heat-curable cationic organic binder, pigments and further additives, wherein the anode consists of a mixture of
- (A) from 30 to 95% by weight of magnetite, lead dioxide, a magnetite/natural graphite mixture or a lead dioxide/natural graphite mixture and
- (B) from 70 to 5% by weight of homo- or copolymers of ethylenically unsaturated organic compounds, which process comprises:
- (1) mixing finely divided components (A) and (B) in an extruder,
- (2) heating this mixture to a temperature of from 100.degree. to 300.degree. C.,
- (3) extruding the mixture,
- (4) cooling and granulating the extrudate, and
- (5) compression-molding the granules to form the anode.
Dependencies are inferred from the claim text.