Polyurethane isocyanate reacts with urethane and urea groups

Carbamate and urea groups still contain activity Hydrogen can continue to react with isocyanate groups to form cross-linking bonds. The activity of urethane group and urea group is lower than that of alcohol, water, amine, phenol, etc., as shown in Table 2-4. Most tertiary amines do not show strong catalytic effects on these two reactions,…