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 non-compliant primers. One primer being evaluated, BR~R6757, is both a zero VOC and zero chromate primer. The objective of this study is to compare the performance of the conventional solvent based primers (BR~R 127 Cytec and EA~R9205 Dexter) with the recently developed and commercially qualified waterborne primers (BR~R 6757 Cytec, BR~R 6747 Cytec, BR~R 6747-1 Cytec, EA~R9257 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 shear (SLS), and wedge crack extension (WCE) tests.