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<p>Utilization of thermosetting polymeric waste by chemical depolymerization method and optimization of the process parameters is an important aspect in today’s era due to the excessive generation of post-consumer waste. Glycolysis of rigid polyurethane (PU) foam waste using diethylene glycol (DEG) was aimed for optimization in the microwave (MW) irradiation in terms of hydroxyl value and viscosity through subsequent exercises of filtration and vacuum distillation. Taguchi model of L9 (3 × 4) was selected as the optimization methodology where various parameters such as PU:DEG ratio, MW power, the concentration of the catalyst and reaction temperature were optimized. Based on the results, the recovered polyols were observed to provide minimal hydroxyl value in the range of 500–600&#xa0;mg KOH/g and viscosity around 800–900&#xa0;cP. The recovered polyol was further used in new rigid PU foam formulations. The reactivity parameters and the density measurements showed considerable results up to 60% replacement of recycled polyol (PUR 60) over virgin polyol (PUR 0) in new PU rigid foam formulations. The thermal conductivity and compressive strength of PUR 60 showed better results than that of the virgin ones (PUR 0).</p> Graphical abstract <p></p>

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Parametric optimization of depolymerization of rigid polyurethane foam using microwave irradiation by L9 Taguchi method

  • 期刊论文

  • 发表日期：

    2025年6月22日

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  • R. Pranavabalaji,
  • Devesh Sane,
  • Debarati Maity,
  • Anagha Sabnis

摘要

Utilization of thermosetting polymeric waste by chemical depolymerization method and optimization of the process parameters is an important aspect in today’s era due to the excessive generation of post-consumer waste. Glycolysis of rigid polyurethane (PU) foam waste using diethylene glycol (DEG) was aimed for optimization in the microwave (MW) irradiation in terms of hydroxyl value and viscosity through subsequent exercises of filtration and vacuum distillation. Taguchi model of L9 (3 × 4) was selected as the optimization methodology where various parameters such as PU:DEG ratio, MW power, the concentration of the catalyst and reaction temperature were optimized. Based on the results, the recovered polyols were observed to provide minimal hydroxyl value in the range of 500–600 mg KOH/g and viscosity around 800–900 cP. The recovered polyol was further used in new rigid PU foam formulations. The reactivity parameters and the density measurements showed considerable results up to 60% replacement of recycled polyol (PUR 60) over virgin polyol (PUR 0) in new PU rigid foam formulations. The thermal conductivity and compressive strength of PUR 60 showed better results than that of the virgin ones (PUR 0).

Graphical abstract