低烟无卤阻燃护套电缆耐开裂性能影响因素分析

本文通过分析低烟无卤阻燃聚烯烃护套料的制造原理,结合不同材料厂家对低烟无卤阻燃材料性能试验,并外护套开裂多发生的钢带铠装结构的电缆外护套进行试验分析,结果表明低烟无卤阻燃材料中不同成分对温度的响应敏感程度不同,造成其生产的电缆耐热应力存在较大差异;同时,电缆铠装层所选用的结构形式以及电缆外护套的厚度是影响低烟无卤阻燃型电缆开裂的主要原因。

This paper analyzes the manufacturing principle of low smoke halogen-free flame retardant polyolefin sheathing materials,combined with the performance test of low smoke halogen-free flame retardant materials made by different manufacturers.The results show that the different components of low smoke halogen-free flame retardant materials have different sensitivity to temperature,and the temperature sensitivity of halogen-free flame retardant materials is higher than that of halogen-free flame retardant materials.At the same time,the structure of the cable armour layer and the thickness of the cable sheath are the main reasons that affect the cracking of the low smoke halogen-free flame-retardant cable.