Polyurethane-polyisocyanurate (PUR-PIR) foams based on castor oil modified with tire rubber waste: Statistical-based analysis

This study explores the utilization of bio-polyol, derived from castor oil modified with waste tire rubber (WTR), in the synthesis of rigid polyurethane-polyisocyanurate foams. Two WTR concentrations (10% and 20%) were incorporated, investigating their impact on foaming, cellular structure, and various foam properties. Response surface methodology assessed the influence of polyol/isocyanate ratios and WTR content on thermal, physical, and mechanical responses. Results indicated significant effects of polyol/isocyanate ratios on thermal and density properties, while WTR content exhibited an opposite trend. Mechanical behavior showed a distinct pattern compared to thermal and physical aspects, suggesting no conclusive correlation between compressive stress variability and polyol/ isocyanate ratio or WTR content. Consequently, the application of these foams depends on specific property requirements, highlighting the potential of sustainable bio-polyols and recycled WTR in replacing conventional petroleum-based counterparts in polyurethane foam production. Highlights * Development of rigid polyurethane-polyisocyanurate foams based on castor oil. * Polyurethane-polyisocyanurate foams modified with waste tire rubber. * Increased isocyanate index impacts thermal stability and density. * Response surface methodology showed variability in compressive stress behavior and the polyol/isocyanate ratio. * For application of polyurethane-polyisocyanurate foams will depend on the desired properties. KEYWORDS castor oil, response surface methodology, rigid polyurethane-polyisocyanurate foams, tire rubber waste
1 | INTRODUCTION Improper disposal of solid waste is one of the main environmental problems currently faced. (1) With the increase in population and consumption, the amount of waste generated [...]