Webevidenced by the dominance of blocked isocyanate patents in the related literature on the topic (Fig. 2).23–26 Measuring the deblocking temperature The temperature at which … WebMay 15, 2016 · Tricresol-blocked di- and polyisocyanates (BDPs) of variable structure are synthesized, and their main physicochemical and technological properties are defined. They have lower melting points and thermal dissociation (deblocking) temperatures than do the known BDPs based on ε-caprolactam, oximes, and secondary amines.. The new …
Supporting information for ON THE VERSATILITY OF …
WebWe also highlight the importance of matching the analytical technique to the application of the blocked isocyanate, with differences in material state and experimental parameters having a great impact on the deblocking temperature reported. U2 - 10.1039/c6py01776b. DO - 10.1039/c6py01776b. M3 - Article. SN - 1759-9954. VL - 7. SP - 7351. EP - 7364 WebFree isocyanate compounds, especially diisocyanate monomers, can be extremely hazardous to health Blocking technology was developed to overcome compound-ing limitations, and provide a safe working environment. The unblocking mechanism (1) is simply the reverse reaction of that used to manufacture the blocked isocyanate (2): … pennecon ltd
Blocked isocyanates: from analytical and experimental …
WebCertain catalysts were found to lower the deblocking temperature [13, 14]. Blocked isocyanates are particularly helpful in dual cure mechanisms. In one instance, UV light … WebJan 2, 2015 · Deblocking temperature and gel time of the blocked isocyanates based on N-methylaniline and N-methyl-o-toludine were lower than the blocked isocyanates with imidazole and methyl 4-methylaminobenzoate. WebJul 10, 2012 · 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. slide insurtech