| 초록 |
Isocyanate crosslinkers with blocking agents based on various derivatives were newly applied to clearcoat applications. Rheological and crosslinking characteristics of clearcoat coatings containing prepared blocked isocyanates (BIs) were scrutinized by comparing with those by the commercialized BI, Desmodur PL350, under thermal curing conditions. Urethane reaction between isocyanate group in BIs and hydroxyl group in a hydroxyl functionalized polyol binder within clearcoats was confirmed via FT-IR and real-time rheological tests. Also, surface mechanical properties of fully-cured clearcoat films were measured by nano-indentation and nano-scratch testers to address the crosslinked network formation affected by prepared BIs. Suggested BIs were found to be favorably applied to thermal curing process of clearcoats, based on their reactivity and curing performance. |
