Epoxy resins are widely used in composite materials for aircraft applications. However, they are difficult to recycle, thus posing an increasing challenge to the aviation sector. By contrast, polyurethane resins (PUR) can be easily chemically recycled by solvolysis, but structural parts made of carbon fibre-reinforced polyurethanes (CF-PURs) are currently not in use in aircraft applications. This is due to a lack of knowledge about the properties of CF-PURs, especially during exposure to higher temperatures and to fire. To increase the recyclability of aircraft parts, for example interior structures like seats, there is a need for CF-PUR components which are able to fulfil the flame retardant regulations as well as the quality and production cycle time requirements of the aviation industry. It was found that a CF-PUR formulation processed by wet compression moulding containing 9 wt% of a phosphorous polyol is able to fulfil these requirements for aviation interior applications.

中文翻译：

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湿压成型生产的飞机用碳纤维增强聚氨酯树脂部件的阻燃性研究

环氧树脂广泛用于飞机应用的复合材料。然而，它们难以回收利用，从而对航空业提出了越来越大的挑战。相比之下，聚氨酯树脂 (PUR) 可以通过溶剂分解轻松进行化学回收，但由碳纤维增强聚氨酯 (CF-PUR) 制成的结构部件目前尚未用于飞机应用。这是由于缺乏对 CF-PUR 特性的了解，尤其是在暴露于较高温度和火灾期间。为了提高飞机部件（例如座椅等内部结构）的可回收性，需要能够满足阻燃法规以及航空业质量和生产周期要求的 CF-PUR 部件。