Ethylene propylene diene polymethylene (EPDM) rubber is one of the fastest growing synthetic rubbers in the market. It is widely used in many fields due to its easy processing and high resistance against outdoor conditions compared to other rubber types. However, like all organic compounds, over time it is degraded under weathering conditions such as radiation, heat, ozone and chemical media, all of which can contribute to loss of bulk properties and reduce its service life. Cracks, discoloration, breakage, or staining can occur on the surface of visible automotive profiles due to the effect of UV light. These phenomena are definitely undesirable. In this study, five different EPDM rubber compounds (control and four different Flamestab® NOR 116 concentrations) were produced. The effects of the Flamestab NOR 116 were investigated by mechanical and rheological tests and ageing using the internationally recognised Florida artificial weathering test. The aged surfaces were visually scrutinised and surface morphological changes were examined via scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analyses. The results obtained showed that Flamestab® NOR 116 can be used as a UV stabiliser for EPDM rubber applications if it is added in amounts of between 1.25 and 2.0 phr.

中文翻译：

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Flamestab®NOR 116对基于EPDM的汽车密封型材的影响

乙丙二烯聚亚甲基（EPDM）橡胶是市场上增长最快的合成橡胶之一。与其他类型的橡胶相比，由于其易于加工且对室外条件具有较高的抵抗力，因此被广泛用于许多领域。但是，像所有有机化合物一样，随着时间的流逝，它会在诸如辐射，热量，臭氧和化学介质等气候条件下降解，所有这些都会导致整体性能下降并缩短其使用寿命。由于紫外线的作用，可见的汽车轮廓表面可能会出现裂纹，变色，破裂或变色。这些现象绝对是不可取的。在这项研究中，生产了五种不同的EPDM橡胶混合物（对照和四种不同的Flamestab®NOR 116浓度）。Flamestab NOR 116的效果通过机械和流变测试以及使用国际认可的佛罗里达州人工耐候性测试进行了老化测试。目视检查老化的表面并检查表面形态变化通过扫描电子显微镜（SEM）和能量色散X射线（EDX）分析。获得的结果表明，如果添加的量为1.25至2.0 phr，Flamestab®NOR 116可以用作EPDM橡胶应用的紫外线稳定剂。