| 摘要 |
A coating which is both a flexible sealant and a corrosion-inhibitive primer which can be used to protect the exterior skin and fastener patterns of high performance aircraft at low temperatures. The coating includes corrosion inhibitive pigmentation, resins, a curing agent, and a solvent blend permitting spray application of the coating. The two resins included in the coating are a reaction product of an epichlorohydrin and bisphenol A plus a polyurethane elastomer which is a reaction product of an aromatic isocyanate and a polyether glycol. The curing agent is a blocked diamine, i.e., a ketimine. The ketimine can be prepared by reacting a carbonyl compound and an aromatic diamine. Water is produced in this reaction. The reaction is reversible, so that as the ketimine absorbs atmospheric moisture, the aromatic diamine is released and in turn cures or cross-links the resins. The mixture of pigmentation, resins, ketimine, and solvent blend is a sprayable material that can be readily applied to surfaces using conventional spray equipment. After application, as the diamine is released, the coating is cured to a tough weather-resistant film. When utilized to protect exterior surfaces, a durable exterior coating can then be applied over the flexible sealant-primer to obtain a two-coat, all weather protective paint system.
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