新型低烟无卤阻燃电缆料的研究

Study of a New Low Smoke Halogen-Free Flame Retardant Cable Compound

采用改性纳米氢氧化镁Mg（OH）2、微胶囊化红磷（MRP）和热塑性酚醛树脂（PF—T）与低密度聚乙烯（LDPE）复配成低烟无卤阻燃电缆料。通过反复试验得出基料LDPE为100份（质量份），（PF—T）、MRP和纳米Mg（OH），的份数比为25：8：40时协同效果最佳，其氧指数达到36，水平燃烧通过FH-1，拉仲强度达13MPa，断裂伸长率为370％。热失重结果表明，协效阻燃体系提高了该复合材料的质量保持率，失重速率明显降低；流变试验表明，添加了PF—T后复合材料的平衡扭矩明显降低；用电子扫描显微镜对复合材料的微观结构分析发现，PF—T和LDPE相容性很好，没有界面产生，无机材料在基料中有很好的分散性。

A new low smoke halogen-free flame retardant cable eompound was prepared by compounding modified nano-magnesium hydroxide（ Mg（ OH）2 ） , miero-eneapsulated red phosphorus（MRP）, thermoplastic phenol-formalde- hyde resin（PF-T） and low density polyethylene（LDPE）. Repeated tests showed the best synergy was obtained by u- sing 100 parts（mass） LDPE and 25 ： 8 ： 40 parts ratio for PF-T ： MRP ： nano-Mg（OH）2 where LOI reaehes 36, the horizontal flame test FH-1 is satisfied, the tensile strength reaches 13 MPa and the elongation at break is 370%. Mass loss test showed the synergized flame retardant system raised the remnant mass of the composite material and remarkably reduced the mass loss rate. The rheological test showed that the balancing torque of the composite material decreased remarkably by adding PF-T, The analysis of the microstmcture of the material by SEM indicated good compatibility（ no interface） between PF-T and LDPE and good dispersion of the inorganic components in the snbstrate.