Reheating decomposition process as chemical recycling for rigid polyurethane foam |
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Authors: | Taro Fukaya Hiroko Watando Shinetsu Fujieda Shioko Saya Cao Minh Thai Masaaki Yamamoto |
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Institution: | Corporate Research and Development Center, Toshiba Corporation, 1 Komukai-Toshiba-Cho, Saiwai-ku, Kawasaki 212-8582, Japan |
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Abstract: | We have found that a reheating process for the products in the chemical recycling of rigid polyurethane foam by an extruder with diethanolamine as a decomposing agent is effective for improving the product stability. The product with stable viscosity was obtained by the reheating process at 175-200 °C for 2 h, regardless of the extruding condition. An amine adduct, which is an intermediate, was found to be the cause of instability of the discharged product from the extruder. At the initial stage of reheating, the intermediate decomposed, releasing toluenediamine, which promoted further decomposition of the discharged products. We have succeeded in controlling the quality of the recycled products. |
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Keywords: | Rigid polyurethane Chemical recycling Reheating Decomposition process Extruder |
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