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Stabilization of polyol for PU flexible foams: anti-scorch packages performance and case studies

von Cinzia Tartarini, Kristin Poljan

Polyurethane flexible foams represent one of the major segments of the polyurethane market. Their manufacture in a variety of shapes by cutting or molding, as well as the ability to produce them in different densities, makes flexible foams well-suited for industries like bedding, furniture and transportation. The exothermic reaction taking place during flexible foam production and the slow heat dissipation through the foam bun can cause polyurethane degradation (scorch), resulting in discoloration, loss of mechanical properties, and, in extreme cases, fire. In order to preserve a foam’s mechanical properties and aesthetics, the use of anti-scorch stabilizers is required. These anti-scorch stabilizers are based on synergistic combinations of antioxidants and process stabilizers. The selection of the most suitable anti-scorch package is highly dependent on the foam end-use application, which determines the processing conditions and the industry parameters that the foam must meet. This paper illustrates how anti-scorch stabilizers prevent polyurethane degradation and how an optimized package enables flexible foams to meet industry requirements.