摘要
为了探究柔性耐火电缆无机矿物质隔火层配方,文中分析了白云石、水玻璃、Mg(OH)_(2)、Al(OH)_(3)这4种无机矿物质材料,以及白云石含量对防火泥密度、黏度、热失重性能和隔热性能的影响,并通过将制备的防火泥灌浆挤出在成品电缆上验证了其隔热性能。结果表明:在白云石、水玻璃、Mg(OH)_(2)、Al(OH)_(3)这4种材料中,白云石协同水玻璃可分别通过吸热分解和形成致密壳层增强隔热性能;基于此核心材料体系,开展配比优化试验,当水玻璃和白云石的质量比为100∶200时,防火泥兼具优异隔热性和结构完整性;将研制出的防火泥灌浆挤出在成品电缆齿形隔离层上试制NGA BTLY电缆样品,在950℃下燃烧10 800 s后,电缆隔火层完好并通过耐压试验,表明研制出的防火泥在电缆燃烧过程中可起到较好的隔堵热氧屏障的作用。
To explore inorganic mineral layer formulation for flexible fire-resistant cables,effects of dolomite,sodium silicate,Mg(OH)_(2),Al(OH)_(3) and mass fraction of dolomite on the density,viscosity,thermogravimetric performance and thermal insulating properties of fire-resistant mud were investigated.Thermal insulating properties of the optimized fire-resistant mud was furtherly validated by encapsulating it onto finished cables.Results indicated that dolomite synergized with sodium silicate could enhance thermal insulating properties via endothermic decomposition and the formation of a dense shell structure respectively in the four materials.Based on this core material system,ratio optimization experiments revealed that when mass ratio of sodium silicate to dolomite was 100:200,the fire-resistant mud could achieve superior thermal insulation and structural integrity.Subsequently,developed coating was applied to the corrugated isolation layer of NG-A BTLY cable samples.After combustion at 950 °C for 10 800 s,the fire-resistant layer of the cable could remain intact,and the cable could pass the voltage withstand test,demonstrating that the developed fire-resistant mud could serve as an effective thermaloxygen barrier during combustion.
作者
王阳
WANG Yang(Jiangxi Copper Technology Research Institute Co.,Ltd.,Nanchang 330096,China)
出处
《电线电缆》
2025年第3期34-41,共8页
Wire & Cable
关键词
无机矿物质
防火泥
吸热反应
隔堵热氧
inorganic minerals
fire-resistant mud
endothermic reaction
thermal-oxygen barrier
