Premium
Deblocking of the water‐soluble isophorone diisocyanate blocked by sodium bisulfite and its application
Author(s) -
Zhou Zhengfa,
Lv Hongxiang,
Wang Xiaowen,
Ren Fengmei,
Xu Weibing
Publication year - 2012
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.38238
Subject(s) - isophorone diisocyanate , sodium bisulfite , polyurethane , isocyanate , fourier transform infrared spectroscopy , chemistry , curing (chemistry) , differential scanning calorimetry , nuclear chemistry , isophorone , polymer chemistry , organic chemistry , chemical engineering , physics , diamine , engineering , thermodynamics
A water‐soluble and low stimulation sodium bisulfite blocked isophorone diisocyanate (IPDI) has been prepared. The blocking and deblocking of the blocked IPDI is observed by hot‐stage Fourier transform infrared (FTIR) spectrophotometer. The experimental results reveal that IPDI is successfully blocked by sodium bisulfite and the blocked IPDI can regenerate isocyanate groups when the temperature is higher than 80°C. Differential scanning calorimetry analysis indicates that blocked IPDI deblocks initially at around 85°C and reaches the maximum deblocking rate at 117°C. The blocked IPDI in liquid and solid states are stable after being stored for 12 months at room temperature. The blocked IPDI is used as curing agent for waterborne hydroxyl polyurethane, which has good adhesive performance and long pot life. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013