Polyurethane adhesives refer to adhesives containing urethane groups (-NHCOO-) or isocyanate groups (-NCO)

Polyurethane adhesives refer to adhesives containing urethane groups (-NHCOO-) or isocyanate groups (-NCO) in the molecular chain. Polyurethane adhesives are divided into two categories: polyisocyanate and polyurethane. Polyisocyanate molecular chain contains isocyano group (-NCO) and urethane group (-NH-COO-), so Polyurethane Adhesive shows a high degree of activity and polarity. It has excellent chemical adhesion with substrates containing active hydrogen, such as foam, plastic, wood, leather, fabric, paper, ceramics and other porous materials, as well as metals, glass, rubber, plastics and other materials with smooth surfaces.

Regardless of the polyurethane adhesive, the isocyanate groups in the system react with the active hydrogen-containing substances in or outside the system to form polyurethane groups or polyurea, which greatly improves the strength of the system and achieves the purpose of bonding.

Polyurethane adhesives have excellent shear strength and impact resistance, are suitable for various structural bonding fields, and have excellent flexibility properties.
Polyurethane adhesive has excellent rubber properties and can adapt to the adhesion of substrates with different thermal expansion coefficients. It forms a soft-hard transition layer between the substrates, which not only has strong adhesion, but also has excellent cushioning and reducing Shock function. The low and ultra-low temperature properties of polyurethane adhesives exceed all other types of adhesives.
Waterborne polyurethane adhesives have the characteristics of low VOC content, low or no environmental pollution, non-combustibility, etc., which is the key development direction of polyurethane adhesives.
The diversity of polyurethane adhesives has prepared solutions for many bonding problems, and is especially suitable for places where other types of adhesives cannot be bonded or where bonding is difficult.
In addition, polyurethane adhesives also have the characteristics of adjustable toughness, simple bonding process, excellent low temperature resistance and excellent stability. It is precisely because of the excellent adhesion properties and adaptability of polyurethane adhesives to a variety of substrates that its application fields continue to expand, and it has become the fastest growing adhesive at home and abroad in recent years.