The uniqueness of polyurethane adhesives

Polyurethane adhesives are high-molecular adhesives formed by polymerization of isocyanates and polyols as the main raw materials. Due to their strong adjustable molecular structure characteristics, they possess multiple excellent properties and are widely used in various fields. The core functional features of polyurethane adhesives are as follows: 

1.It has extremely strong bonding compatibility and can achieve firm bonding of various homogeneous and heterogeneous materials such as metals, plastics, rubber, wood, fabric, and leather. It compensates for the weak bonding force at the interface of different materials and meets the bonding requirements of complex composite structures. It is the core adhesive for soft packaging and composite material processing. 

2. The mechanical properties are highly balanced and excellent. After curing, the adhesive layer possesses both high strength and high toughness, with outstanding resistance to impact, bending, and peeling. It will not crack or detach due to external force impact or substrate deformation. Moreover, through formula adjustment, different hardness levels of adhesive layers ranging from flexible to rigid can be prepared to meet various application scenarios. 

3. Outstanding weather resistance and chemical resistance properties. The adhesive layer has good performance in withstanding high and low temperatures, and can maintain stable performance within a wide temperature range. At the same time, it possesses excellent water resistance, oil resistance, and resistance to weak acids and weak alkalis. In outdoor environments, humid conditions, and scenarios involving oil contamination, it can still maintain the bonding strength and structural integrity, and has a long service life. 

4. The process adaptability is flexible, and the product forms are diverse, including solvent-based, non-solvent-based, water-based, and hot-melt types, etc. They can be adapted to different construction processes such as spraying, scraping, and rolling. Among them, the non-solvent and water-based products conform to the environmental protection trend, have low VOC emissions, and meet the current requirements for green production control.