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Waterborne polyurethane adhesive properties and use

November 15, 2024

Polyurethane Adhesive refers to an adhesive containing a urethane group (-NHCOO-) or an isocyanate group (-NCO) in the molecular chain. It has excellent performance and should be widely used. According to Gunter Festel, a polyurethane adhesive specialist at Bayer in Germany, the diversity of polyurethane adhesives is almost a solution to every bonding problem.

Polyurethane adhesives are classified into two major categories: polyisocyanates and polyurethanes. They contain highly polar, highly chemically reactive isocyanate (-NCO) and urethane (-NHCOO-) groups, and materials that contain active hydrogen, such as Porous materials such as foam plastics, wood, leather, fabrics, paper, and ceramics, and materials with smooth surfaces such as metal, glass, rubber, and plastics all have excellent chemical adhesion. The effect of hydrogen generated between the polyurethane and the adhered material increases the cohesive force of the polymer. This will make the bond stronger. In addition, polyurethane adhesives also have the characteristics of adjustable toughness, simple bonding process, excellent low temperature resistance and excellent stability. In recent years, they have become the fastest growing adhesives at home and abroad.

 

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