Polyurethane Adhesive is a high-performance adhesive with
Polyurethane Resin as its main base material. From a chemical composition perspective, it is mainly formed by the chemical reaction polymerization of isocyanates (such as MDI, TDI) and polyols (such as polyester, polyether).
The core feature of this type of adhesive lies in the presence of strong polar amine carbamate groups in its molecular chain. By adjusting the ratio of the soft segment (polyol) to the hard segment (isocyanate) in the formulation, its properties can be controlled over a wide range, enabling a transition from a soft elastomer to a high-hardness solid.
Key features include:
1. Wide bonding range: It has excellent adhesion to various materials such as metals, plastics, rubber, wood, ceramics, and fabrics, and is particularly adept at bonding different types of heterogeneous materials.
2. Excellent mechanical properties: After curing, it exhibits extremely high toughness and impact resistance, capable of withstanding dynamic loads and stress variations while maintaining good flexibility.
3. Outstanding low-temperature resistance: It maintains good elasticity even at extremely low temperatures and is less prone to cracking. This property is superior to that of many other types of adhesives.
4. Diverse processes: According to application requirements, it can be manufactured in single-component (curing by moisture) or two-component (curing by mixing) forms. It can also be classified as solvent-based, water-based, or solvent-free (hot melt) types.
In terms of application, it is widely used in various fields such as automotive manufacturing (windshield bonding), footwear materials (soles bonding), construction (composite panels), flexible packaging (food composite films), and the electronics industry.
