Performance of Solvent and Water Based Primers in Epoxy Adhesive Systems

摘要

Adhesive bond primers are critical to the quality and performance of an adhesive system. Primers are used to enhance adhesion and to prevent corrosion of the metal surface. Most current primers do not meet the 240g/L compliance limit for volatile organic compounds (VOC's) and contain chromates. Waterborne primers, with reduced VOC levels, have been evaluated for future use as a replacement for these noncompliant primers. One primer being evaluated, BR (Trade name) 6757, is both a zero VOC and zero chromate primer. The object of this study is to compare the performance of the conventional solvent based primers (BR (Trade name) 27 Cytec and EA (Trade name) 9205 Dexter) with the recently developed and commercially qualified waterborne primers (BR (Trade name) 6757 Cytec, BR (Trade name) 6747 Cytec, BR (Trade name) 6747-1 Cytec, EA (Trade name) 9257 Dexter), when coupled with various epoxy adhesives that are frequently used on naval aircraft. The mechanical and qualitative properties of these adhesive systems were evaluated via floating roller peel (FRP), single lap sheer (SLS), and wedge crack extension (WCE) tests.