废聚氨酯泡沫的化学回收：醋酸锌催化下的高效酸解,ACS Sustainable Chemistry & Engineering

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废聚氨酯泡沫的化学回收：醋酸锌催化下的高效酸解
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-03-21 , DOI: 10.1021/acssuschemeng.2c07260
Huiwen He ₁ , Hang Su ₁ , Hanjing Yu ₁ , Kaiming Du ₁ , Fan Yang ₁ , Yifeng Zhu ₁ , Meng Ma ₁ , Yanqin Shi ₁ , Xiaojun Zhang ₂ , Si Chen ₁ , Xu Wang ₁

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酸解是一种有效的化学降解方法，可以将热固性聚氨酯完全解聚成可重复使用的单体。然而，能源消耗控制和回收产品的质量改进仍然是重大挑战。在此，发现醋酸锌是一种高性能催化剂，可促进聚氨酯泡沫（PUF）的快速高效酸解，并有助于实现无溶剂反应，显着提高可再聚合回收多元醇（RP）的质量。在酸解中，锌离子可以从尿素键和氨基甲酸酯键吸引羰基上的氧。同时，醋酸盐激活酸解剂，促进PUF更快更彻底的降解，降解度高（97%），降解速率快（200℃下3小时）。回收的多元醇可在柔性 PUF (RPUF) 的再生中用作原始多元醇（高达 40 wt%）的部分替代品，RPUF 的机械性能仍能满足商业要求。该研究提出了一种采用高性能催化剂的高效酸解方法，推动了PUF降解回收技术的发展，实现了反应的绿色、节能、RP的高值化利用，为产业化提供了理论支持。

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Chemical Recycling of Waste Polyurethane Foams: Efficient Acidolysis under the Catalysis of Zinc Acetate

Acidolysis is an efficient chemical degradation method that could completely depolymerize thermosetting polyurethanes into reusable monomers. However, energy consumption control and the quality improvement of recycled products remain significant challenges. Herein, zinc acetate is discovered as a high-performance catalyst, which promotes the rapid and efficient acidolysis of polyurethane foams (PUFs) and also helps realize a solvent-free reaction and significantly improves the quality of repolymerizable recovered polyols (RPs). In acidolysis, zinc ions could attract the oxygen on the carbonyl group from urea and carbamate bonds. Meanwhile, acetate activates the acidolysis agent and promotes faster and more thorough degradation of PUFs, with a high degradation degree (97%) and fast rate (3 h at 200 °C). The recycled polyols could be used as a partial substitute for virgin polyol (up to 40 wt %) in the reproduction of flexible PUFs (RPUFs), with mechanical properties of RPUFs still meeting the commercial requirements. This research presents an efficient acidolysis with a high-performance catalyst, which promoted the development of the technology for PUF degradation and recycling, realizing a green, energy-saving reaction, high-value utilization of RP, and providing theoretical support for industrialization.

更新日期：2023-03-21

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