Self-healing coatings
AssigneeThe Johns Hopkins University
InventorsJason J. Benkoski, Rengaswamy Srinivasan, Jeffrey P. Maranchi
Life of this patent
Estimating the term…
Abstract
A metallic microcapsule containing a polymeric microcapsule having one or more polymeric precursors encapsulated therein; and a metallic shell enclosing a volume containing the polymeric microcapsule is disclosed. Also disclosed is a self-healing coating composition comprising (a) a film-forming binder; and (b) metallic microcapsules, the metallic microcapsules being the same or different and containing a polymeric microcapsule containing one or more polymeric precursors encapsulated therein; and a metallic shell enclosing a volume containing the polymeric microcapsule.
Claims19
A self-healing coating composition, comprising:
- (a) one or more film-forming binders;
- and
- (b) metallic microcapsules, the metallic microcapsules being the same or different and comprising (i) a polymeric microcapsule encapsulating one or more polymeric precursors in a liquid state therein;
- and (ii) a metallic shell enclosing a volume containing the polymeric microcapsule;
- said metallic shell comprises a metal comprising zinc;
- said one or more polymeric precursors encapsulated in the polymeric microcapsule being configured to form a solidified reaction product of a polymeric material when exposed to moisture upon rupture of the metallic microcapsule;
- wherein the metallic shell of each of the metallic microcapsules are present in the self-healing composition at an amount sufficient to provide galvanic protection to an exposed metal surface.
A method of providing corrosion protection for an exposed metal surface, comprising:
- (a) providing a self-healing coating on a substrate to form a coated metal surface, the self-healing coating comprises (i) one or more film-forming binders and (ii) a sacrificial anode comprising a plurality of metallic microcapsules, wherein the plurality of metallic microcapsules comprise a polymeric microcapsule encapsulating one or more polymeric precursors in a liquid state and a zinc-containing metallic shell enclosing a volume containing the polymeric microcapsule;
- said one or more polymeric precursors encapsulated in the polymeric microcapsule being configured to form a solidified reaction product of a polymeric material when exposed to moisture upon rupture of the metallic microcapsule;
- wherein the metallic shell of each of the metallic microcapsules are present in the self-healing coating at an amount sufficient to provide galvanic protection to said exposed metal surface;
- (b) subsequent to a metal-exposing event providing the exposed metal surface having an exposed area, allowing at least a portion of the metallic microcapsules to rupture and allowing the one or more polymeric precursors to flow into and seal the exposed area;
- and
- (c) galvanically protecting the exposed metal surface via the sacrificial anode comprising the plurality of metallic microcapsules prior to and during the step of allowing the one or more polymeric precursors to flow into and seal the exposed area.
Dependencies are inferred from the claim text.