Problems with reactive polyurethane hot melt adhesives

    

Although the performance characteristics of reactive polyurethane hot melt adhesives are very outstanding, there are still some technical problems to be solved.

1. Reduce melting temperature and melt viscosity.

2. Improve the initial adhesion and shorten the positioning time.

3. Enhance the flexibility, heat resistance and flame retardancy of the product.

4. The preparation process and equipment, gluing equipment, etc. are still lacking and imperfect, and the cost is relatively high.

5. Solvent-free, one-component type. Unlike solvent-based adhesives, which require a drying process, there is no problem of environmental pollution and poisoning due to solvents. The bonding process is simple, and sizing methods such as roller coating or spraying can be used, and it is suitable for various automatic assembly lines.

6. It can be glued at low temperature. The melting temperature of polyurethane reactive hot-melt adhesive is lower than the use temperature of general hot-melt adhesive (170-200°C), and it can be applied at low temperature, and can be used at 120-150°C. Save energy and reduce the corrosion of the gluing device, especially suitable for bonding heat-sensitive materials (such as plastics, etc.).

7. Operability is good. The two adherends can be fixed in a short time, so the assembly can be quickly transferred to the next processing procedure to improve work efficiency.

8. Long pot life: the pot life can reach 16h at 150°C, and 3 days at 90°C.

9. Excellent heat resistance, cold resistance, water vapor resistance, chemical resistance and solvent resistance. Compared with the original hot-melt adhesive, the listed properties are greatly improved due to the cross-linked structure of the reactive hot-melt adhesive.

10 Reactive polyurethane hot melt adhesive is irreversible after curing, that is, it will not dissolve when heated again after curing.

If you don't know enough about reactive polyurethane hot melt adhesives. It is recommended that you must give priority to choosing experienced hot melt adhesive manufacturers. Hot melt adhesive R&D and quality inspection teams are also very important. We are in China, know more about hot melt adhesives, and give the answer. Contact us now to learn about the story of our hot melt adhesives, understand the application of hot melt adhesives, and customize the most suitable and popular adhesives for you!