Establishment of recovery method of available substances from polyurethane by chemical decomposition

化学分解回收聚氨酯有效物质方法的建立

• 批准号: 05555257
• 负责人: MITANI Tomoyo
• 金额: $ 1.6万
• 依托单位: Tokyo National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555257/
• 关键词: Polyurethane; Recycle; Chemical decomposition; Monoethanolamine; Isopropanolamine; Methylendiphenylisocyanate; ポリウレタンフォーム; 再発泡

The purpose of this study is to establish the recovery method of polyol from polyurethane foam by chemical decomposition. Methylendiphenylisocyanate (MDI) -based polyurethane foam was decomposed by monoethanolamine (MEA) or isopropanolamine (IPA) at 170ﾟC.The decomposing liquid was separated into two layrs regardless of decomposing agent. MEA was superior to IPA because polyol was contained only in the upper layr in the case of MEA decomposition, and was distributed in the both layrs for IPA decomposition.The upper layr obtained by MEA decomposition was extracted by hexane to raise the purity of polyol. The extracted liquid was separated into three layrs. A large amount of polyol existed in the middle layr, in which polyol was contained 72% by weight, hexane 20%, and by-products 8%. The by-products were found to be diphenylmethanediamine (DAM) or polymeric DAM, which were derived from MDI or polymeric MDI, by GPC, HPLC, and NMR analyzes.The recovered polyol containing hexane and by-products, was used for re-producing polyurethane foam by mixing in various ratios with virgin polyol. A good cellular structure foam was obtained with recovered polyol weight up to 30%.

本研究的目的是建立通过化学分解从聚氨酯泡沫中回收多元醇的方法。亚甲基二苯基异氰酸酯（MDI）基聚氨酯泡沫在170℃下用单乙醇胺（MEA）或异丙醇胺（IPA）分解。无论分解剂如何，分解液均分为两层。 MEA优于IPA，因为MEA分解时多元醇仅包含在上层，而IPA分解时多元醇分布在两层中。MEA分解得到的上层用己烷萃取，以提高多元醇的纯度。萃取液分离成三层。中间层存在大量多元醇，其中多元醇含量为72重量％，己烷为20％，副产物为8％。通过 GPC、HPLC 和 NMR 分析，发现副产物是二苯基甲烷二胺 (DAM) 或聚合 DAM，它们源自 MDI 或聚合 MDI。回收的含有己烷和副产物的多元醇，通过与原始多元醇以不同比例混合，用于再生聚氨酯泡沫。获得了良好的多孔结构泡沫，回收的多元醇重量高达30%。