环保型城市轨道交通柔性耐火电缆的研制

The Development of Environment-friendly Flexible Fire-resistant Cable for Urban Rail Transit

研制了一种环保型柔性城市轨道交通耐火电缆,具有低烟无卤阻燃的特性,优化了现有柔性城市轨道交通耐火电缆的结构,其耐火层主要包括绕包在导体表面的云母带、填充在缆芯中的阻燃耐火无机材料和包覆在缆芯外的阻燃耐火包带和陶瓷化聚烯烃隔氧层。在常温下,这种结构的电缆柔软性好;在高温下,隔氧层中的陶瓷化聚烯烃经火焰烧蚀后形成坚硬的壳体,抗冲击、耐喷淋,保证电缆的完整性。

This paper developed an environment-friendly flexible fire-resistant cable for Urban Rail Transit,with low smoke halogen-free flame retardant characteristics.The structure of the existing flexible fire-resistant cable for Urban Rail Transit is optimized.The refractory layer mainly consists of mica tape wrapped on the surface of the conductor,flame retardant inorganic material filled in the cable core and the cable coated.At normal temperature,the cable of this kind of structure is soft.At high temperatures,the ceramicized polyolefin in the oxygen barrier layer is ablated by flame to form a hard shell which is impact resistant and spray resistant to ensure the integrity of the cable.