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首页> 外文会议>Global Symposium on Recycling, Waste Treatment and Clean Technology; 20040926-29; Madrid(ES) >CHEMICAL RECOVERY OF POLYETHER POLYOLS FROM FLEXIBLE POLYURETHANE FOAM WASTES: CATALYST INFLUENCE
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CHEMICAL RECOVERY OF POLYETHER POLYOLS FROM FLEXIBLE POLYURETHANE FOAM WASTES: CATALYST INFLUENCE

机译：柔性聚氨酯泡沫废料中聚乙烯的化学回收：催化剂的影响

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摘要

Polyurethanes represent one of the most important groups of plastics, so the increasing quantity of wastes makes its recycling an urgent task. The general purpose of polyurethane chemical recycling is to recover the polyol, a valuable raw material. Most of these processes yield a liquid mixture, which can only be used blended with raw materials to obtain middle quality products. Nevertheless, better quality products can be achieved from flexible polyurethane foams using a two-phase glycolysis. In this study, glycolysis reactions of flexible polyurethane foams in "split phase" were conducted with different glycols and catalysts, in order to study their activity and select a system which allows the obtaining of a quality recycled polyol. Reaction kinetics were investigated using GPC, glycolysis products were analysed by FT-IR and their properties measured according to standard methods. Diethylene glycol was probed to be the most suitable glycol to obtain a high quality recovered polyol. Diethanolamine and titanium butoxide showed a suitable catalytic activity. Times to reach complete conversion, chemical properties of the polyol phase and its purity depend on the glycol and catalyst employed. The recovered polyol obtained with DEG and DEA as catalyst has proved to be an economic alternative to organometallic catalysts as titanium compounds and presents good expectations to be successfully applied in new PU flexible foams synthesis.
机译：聚氨酯代表了最重要的塑料类别之一，因此废物数量的增加使得其回收成为当务之急。聚氨酯化学循环的一般目的是回收多元醇，一种有价值的原料。这些过程大多数都会产生液体混合物，只能与原材料混合使用以获得中等质量的产品。然而，使用两阶段糖酵解，可以从软质聚氨酯泡沫中获得更高质量的产品。在这项研究中，使用不同的二元醇和催化剂在“分裂相”中进行软质聚氨酯泡沫的糖酵解反应，以研究其活性并选择一种体系，该体系可得到优质的循环多元醇。使用GPC研究反应动力学，通过FT-IR分析糖酵解产物，并根据标准方法测量其性质。发现二甘醇是最合适的二醇，以获得高质量的回收多元醇。二乙醇胺和丁氧基钛表现出合适的催化活性。达到完全转化的时间，多元醇相的化学性质及其纯度取决于所用的乙二醇和催化剂。事实证明，以DEG和DEA为催化剂获得的回收多元醇是有机金属催化剂（如钛化合物）的经济替代品，并有望成功应用于新型PU柔性泡沫合成。

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