Cell Openness:
A higher cell openness in a product ensures a more uniform distribution of polymer within the naturally open-celled foam structure, resulting in increased resilience. On the contrary, a reduced cell openness leads to increased incompressibility of the complete cell walls in comparison to open-celled foam, resulting in decreased resilience.
To enhance the cell openness of polyurethane foam, you can fine-tune the foaming agent’s dosage and adjust the surface tension of the cell walls, thereby controlling the ease of cell wall rupture.
Cell Geometry:
Improving the regularity of cell shapes bolsters the resilience of polyurethane foam. Polyurethane foam with a spherical cell structure exhibits superior resilience. Needle-shaped cell structures are more susceptible to collapse, which can be mitigated by lowering the foaming temperature to prevent excessive expansion and deformation.
Foams with a higher proportion of smaller cells within the same system tend to possess greater resilience, but there exists an optimal cell size. Additionally, an appropriate amount of cell stabilizer can be incorporated to achieve the desired effect.
Polyurethane Raw Materials:
Within a specific range, elevating the relative molecular weight of polyether polyols enhances the flexibility and resilience of the foam. However, surpassing this range may result in a softer foam. When employing high molecular weight polyether polyols, it is advisable to include an appropriate amount of antioxidant to prevent degradation during polymerization.
Precise control of the Isocyanate Index (TDI index) is crucial. Within the range of TDI index 105 to 115, you can easily and safely adjust the foam’s hardness. Increasing the TDI index within this range can boost both hardness and resilience.
Polyurethane raw materials find widespread applications in various products, including PU synthetic leather, PU shoe soles, polyurethane elastomers (soft and hard foams), polyurethane coatings, adhesives, polyurethane fibers, and polyurethane resins. Polyurethane stands out as one of the most commonly used synthetic materials in this century, closely intertwined with daily life. We offer a variety of imported and domestic catalyst materials and foaming agents for these applications.