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Polyurethane adhesivespecificmeans that the molecular chain contains carbamate groups (-NHCOO-) or isocyanate-based (-NCO) adhesives. Polyurethane adhesives are divided into two categories: polyisocyanate and polyurethane. Polyisocyanate molecular chains contain isocyano groups (-NCO) and carbamate groups (-NH-COO-), so polyurethane adhesives exhibit high activity and polarity. It has excellent chemical adhesion to substrates containing active hydrogen, such as…