Enhanced and Eco-Friendly Recycling of Carbon-Fiber-Reinforced Plastics Using Water at Ambient Pressure,ACS Sustainable Chemistry & Engineering

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Enhanced and Eco-Friendly Recycling of Carbon-Fiber-Reinforced Plastics Using Water at Ambient Pressure
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-10 , DOI: 10.1021/acssuschemeng.9b06371
Doo Hun Kim _{1,

2,

3} , Miyeon Lee _{1,

2} , Munju Goh ₃

Affiliation

In general, the cross-linked epoxy resin is a thermosetting resin, which cannot be dissolved in an organic solvent. Therefore, materials containing epoxy resins, especially carbon-fiber-reinforced plastics (CFRPs), are difficult to recycle. In our study, we succeeded in dissolving the epoxy resin within 2 h at atmospheric pressure and a reaction temperature of 100 °C, which are optimal conditions for the depolymerization; this was achieved by using an aqueous NaOCl solution, which made it possible to recycle these CFRPs. Further, the depolymerization mechanism was determined, which involved the hydroxyl radicals generated from the aqueous NaOCl solution. We identified that an initial pH of 12.05 and a reaction temperature of 100 °C are optimal conditions for the depolymerization of CFRP. Moreover, the reclaimed carbon fibers (CFs) showed physical properties almost similar to those of virgin CFs. In addition, high value-added products were fabricated by using the CFs and resin decomposition products recovered after the decomposition of CFRPs. Thus, the recyclability of CFRPs was maximized to realize minimizing the generation of waste.

中文翻译：

在常压下使用水增强碳纤维增强塑料的环保回收

通常，交联环氧树脂是不能溶解在有机溶剂中的热固性树脂。因此，包含环氧树脂的材料，尤其是碳纤维增强塑料（CFRP），很难回收利用。在我们的研究中，我们成功地在常压和100°C的反应温度下2小时内将环氧树脂溶解，这是解聚的最佳条件。这可以通过使用NaOCl水溶液来实现，这可以回收这些CFRP。此外，确定了解聚机理，其涉及从NaOCl水溶液产生的羟基自由基。我们确定初始pH为12.05和反应温度为100°C是CFRP解聚的最佳条件。而且，回收的碳纤维（CFs）的物理性能几乎与原始CFs相似。另外，通过使用CFs和CFRPs分解后回收的树脂分解产物，可以制造高附加值的产品。因此，最大程度地提高了CFRP的可回收性，从而实现了废物产生的最小化。

更新日期：2020-01-10

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