Encapsulation of a Pigmented Curable High Temperature Sealant.

摘要

The purpose of the program was to demonstrate the merit and feasibility of encapsulating a two component curable high temperature sealant and coating the capsules on fasteners. Capsules containing RTV Silicone and FTV Silicone pigmented with BaCrO4have been formed possessing 80-88% internal phase and a capsule size of 75to 350microns. Coating techniques and materials were developed for adhering the sealant capsules to the surface of rivets. A topcoating of acrylic resin was applied to the surface of the adhered capsules to improve their handling characteristics. Environmental shelf-life studies on capsule coated rivets indicate excellent shelf-life under varying exposure conditions. Salt spray tests were conducted to evaluate the encapsulated silicone material on high temperature sealants in aircraft. (Author)