Polyurethane adhesives, as a high-performance adhesive, possess numerous outstanding properties due to their unique chemical structure and are widely used in industrial production and the flexible packaging industry. The following are its top ten outstanding advantages:
1. Outstanding bonding strength and toughness: Polyurethane adhesives not only achieve extremely high bonding strength, but also have both rigid and flexible segments in their molecular chains. This enables the adhesive layer to resist deformation when subjected to external forces, while also possessing excellent flexibility, impact resistance, and peel resistance, making it less prone to cracking.
2. Excellent low-temperature resistance: At extremely low temperatures, many adhesives become brittle and ineffective, but polyurethane adhesives can still maintain good elasticity and bonding strength, making them an ideal choice for deep cold environments (such as liquefied natural gas storage tanks and polar equipment).
3. Outstanding wear resistance and fatigue resistance: The cured
Polyurethane Adhesive layer features high elasticity and hardness, effectively absorbing and dispersing stress. Therefore, it is highly wear-resistant and can withstand repeated vibrations or bending, with a long fatigue life.
4. Outstanding chemical and weather resistance: It has excellent resistance to a variety of oils, solvents, ozone and radiation. Through formula adjustment, some types can also possess excellent hydrolysis resistance and UV aging resistance, making them suitable for harsh outdoor environments.
5. Efficient curing methods: It can be formed through various methods such as moisture curing, thermal curing or two-component reaction curing. Among them, the single-component moisture-curing type is extremely convenient to use. It can be directly taken out of the packaging and applied, and the curing can be completed relying on the moisture in the air.
6. Outstanding flexibility: Its adhesive layer can flexibly deform along with the expansion and contraction of the bonding material, effectively alleviating the internal stress caused by the different thermal expansion coefficients of the materials. It is particularly suitable for bonding materials of different properties.
7. Wide range of applicable materials: It shows excellent bonding effect on a variety of polar and non-polar materials, and can successfully connect metals, rubber, plastics, wood, fabrics, ceramics, glass, etc. It is truly a "universal adhesive".
8. Adjustable physical and chemical properties: By changing the raw material ratio and molecular design, its hardness, modulus, curing speed, flexibility, etc. can be precisely regulated, thereby customizing special adhesives that meet specific requirements.
9. Good filling and buffering performance: Before curing, it usually has appropriate thixotropy and workability, and can fill uneven bonding surfaces. After curing, its high elastomer properties can also provide excellent buffering and shock absorption effects.
10. Excellent electrical insulation: The cured polyurethane adhesive layer is an excellent electrical insulator, featuring high volume resistivity and breakdown voltage. Therefore, it is widely used in the bonding, sealing and potting of electronic components.
In conclusion, polyurethane adhesives integrate the advantages of high strength, high toughness, low-temperature resistance, and versatility in multiple materials. This balance of comprehensive performance makes them one of the indispensable key materials in modern industry.
