Abstract
Bio-mass based curable resins having triethoxysilyl groups (bio-mass based silane terminated resins) were synthesized from castor oil (bio-mass polyol) and 3-isocyanatopropyltriethoxysilane. Dibutyltin dimethoxide (DBTDM) or boron trifluoride-monoethylamine complex (BF3－MEA) as a curing catalyst was blended with the bio-mass based silane terminated resin and 3-aminopropyltriethoxysilane to afford curable compositions. The cured products of the compositions were exposed to water at 80℃. The hydrolytic degradation was evaluated by IR spectroscopy. It was found that the both ester and urethane bonds in the cured compositions using BF3－MEA were more stable than those using DBTDM even after exporsed to water at 80℃. It was also found that resins cured by DBTDM were more susceptible to hydrolysis than uncured resins. BF3－MEA exhibited high catalytic activity, and the obtained materials showed almost the same adhering properties as those cured by DBTDM. It was expected that BF3－MEA can be a promising catalyst for bio-mass based silane terminated resin, and widely applicable to adhesives, sealants, and coatings.
