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Two‐component modified polyurethane sealant for insulating glass: Design, preparation, and application
Author(s) -
Li Wan,
Liu Xingjiang,
Wu Jinbi,
Wu Linzhi,
Sun Ailing,
Wei Liuhe
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48219
Subject(s) - polyurethane , materials science , sealant , curing (chemistry) , polymer , polyamide , fourier transform infrared spectroscopy , composite material , isocyanate , polymer chemistry , chemical engineering , engineering
A new two‐component modified polyurethane (PU) sealant was designed and synthesized for insulating glass. This sealant was designed based on a crosslinked reaction between a p ‐chlorophenol‐blocked PU pre‐polymer (Pre‐polymer 2 ) in Component A and a poly‐functional hyperbranched polyamine polymer (polyamide resin 300 # ) in Component B. During the synthesis of Pre‐polymer 2 , Fourier transform infrared spectral analysis was used to track the process, and the optimal reaction time and temperature were 1.5 h and 80 °C, in the presence of 4, 4′‐diphenylmethane diisocyanate (MDI). Different curing agents also used as deblocking agents were screened and it was found that polyamide resin 300 # was a good candidate for the curing reaction. In addition, the low‐temperature curing rate was also improved by using dibutyltin dilaurate (DBTDL) and organobentonite together as a composite catalyst. Finally, the prepared two‐component modified PU sealant for insulating glass was successfully used in an assembly line with good performance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48219.