Curing of silylated polyurethane with BF3-monoethylamine complex as moisture-curable adhesives and their properties

Boron trifluoride monoethylamine complex (BF3-MEA) was evaluated as one of the curing catalyst, for the moisture-curable adhesive based on the polyurethane end-capped with trimethoxysilane (silylated polyurethane). BF3-MEA worked as the catalyst of condensation reaction of trimethoxysilyl groups in silylated polyurethane to give the corresponding networked polymer. The curing speed, the bond strength, and the heat resistance of the crosslinked adhesives with BF3-MEA were compared with dibutyltin dimethoxide. It was found that BF3-MEA was a good curing catalyst, which showed the same performance in the bond strength and remarkable advantages in the curing speed and the heat resistance, compared with organotin compound. (c) 2007 Wiley Periodicals, Inc.