Self-healing coatings are made by incorporating microcapsules (60 - 150 microns in diameter) and nanocapsules (10-100 nanometers) that contain film-formers and lead dust suppression compounds into the paint primers at the time of coating application. When coating is scratched, the microcapsules break and spill their film formers, which protect the underlying substrates from damage, and repair some of the coating damage. Various types of inhibitors/film formers were tested, and three (3) different techniques for application of the coatings with microcapsules were evaluated. Self-healing coatings were developed for overcoating lead-based paint on wood for suppression of lead dust. Microcapsules containing calcium hydroxide and microcapsules containing polybutene were both evaluated, independently, when applied by drawdown method, brush or roller. The performance of microcapsules/nanocapsules evaluated in this study was found to be dependent on the method of application. Based on the laboratory results, field tests of these coatings were initiated.

Subject
Self-healing, External surfaces, Brushing, Primers, Coating application, Lead paints, Coatings, Overcoatings, Microcapsules, Mixtures, Lead, Equipment, Latex paints
Keywords:
coatings, self-healing, microcapsules, nanocapsules, lead-based paint, lead dust
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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