Polyurethane adhesives, as a high-performance adhesive, are widely used in many fields due to their unique chemical structure. Its advantages are mainly reflected in the following aspects:
1. Excellent bonding performance and wide applicability
The most prominent advantage of polyurethane adhesives is their excellent bonding ability to a variety of materials. It can not only firmly bond polar materials with high surface energy such as metal, glass and stone, but also bond non-polar materials with low surface energy such as plastic, rubber, wood, leather and fabric excellently. Even for bonding between different materials (i.e., "bonding of different materials"), it performs exceptionally well. This "universal" bonding property makes it the preferred choice in industries such as composite packaging, automotive manufacturing, footwear, and furniture.
2. Excellent flexibility and fatigue resistance
The molecular chain of the cured
Polyurethane Adhesive contains soft carbamate segments, which endow its adhesive layer with excellent elasticity and flexibility. This characteristic enables it to effectively absorb and disperse stress, making it particularly suitable for bonding components that operate under conditions of thermal expansion and contraction, vibration or impact. It will not crack like rigid adhesives, thus having excellent fatigue resistance and impact resistance, which greatly enhances the service life and reliability of the products.
3. Good low-temperature resistance and chemical resistance
In low-temperature environments, many adhesives become brittle and ineffective, but polyurethane adhesives can still maintain good bonding strength and elasticity in extremely cold conditions of minus tens of degrees Celsius. This feature makes them indispensable in extreme environments such as refrigeration equipment and aerospace. Meanwhile, it also has certain oil resistance, grease resistance, ozone resistance and solvent resistance, and can adapt to relatively complex usage environments.
4. Adjustable processability and diverse curing methods
The formula design of polyurethane adhesives is flexible. By adjusting the raw materials, its curing speed, viscosity, initial adhesion and final performance can be precisely controlled to meet the requirements of specific applications. Its curing methods are also extremely diverse, including moisture curing, thermal curing, room temperature curing, etc., providing users with great process convenience. For instance, single-component moisture-curing products are easy to use, do not require mixing, and can cure when exposed to air.
Polyurethane adhesives, with their outstanding universal bonding properties, excellent flexibility, superior low-temperature resistance and flexible adjustability, have become a category of adhesives with extremely prominent comprehensive performance, playing an irreplaceable role in modern industrial production and daily life.
