Self-curing behaviors of single pack aqueous-based polyurethane system

✍ Scribed by Guan-Nan Chen; Kan-Nan Chen

• Book ID: 101250766
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 365 KB
• Volume: 63
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970321)63:12<1609::aid-app12>3.0.co;2-v

✦ Synopsis

A di-or triaziridinyl compound served as the latent curing agent for the prepared carboxylic groups containing aqueous-based polyurethane (PU) dispersions. It was formulated as a single pack self-curable aqueous-based PU system. This system was stable under an alkaline environment and its curing reaction could be initiated by a pH control. A model reaction between a monoaziridinyl compound and formic acid was demonstrated and identified by infrared spectrophotometry. The stabilities of this convenient one-package PU system with a different dosage of di-or triaziridinyl latent curing agent were monitored by a particle sizer and fluorescence spectroscopy. The PU films were cast and self-cured from these single pack PU dispersions at ambient temperature. The physical and mechanical properties as well as thermal behaviors of each self-cured PU were evaluated.