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采用低密度聚乙烯/乙烯-醋酸乙烯/三元乙丙橡胶(PE-LD/EVA/EPDM)共混物为电缆护套料的基材,分别以复配的氢氧化镁/氢氧化铝[Mg(OH)2/Al(OH)3]和单组分的Mg(OH)2为阻燃体系,研究了这两种阻燃体系对材料的阻燃性能和力学性能的影响。结果表明,随着Mg(OH)2/Al(OH)3比例的增大,材料的拉伸强度和极限氧指数增加,但断裂伸长率不断下降;在以Mg(OH)2为阻燃剂的体系中,材料的极限氧指数与Mg(OH)2的添加量成正比,而拉伸强度和断裂伸长率与其成反比,当Mg(OH)2的添加量在40～50份时,材料的极限氧指数能够达到29%以上,力学性能也优于Mg(OH)2/Al(OH)3体系阻燃的材料。
The base materials of cable sheathing materials were blends of low density polyethylene / ethylene-vinyl acetate / ethylene-propylene-diene terpolymer (PE-LD / EVA / EPDM) Mg (OH) 2 / Al (OH) 3] and one-component Mg (OH) 2 as flame retardants. The effects of these two flame retardant systems on the flame retardancy and mechanical properties of the materials were investigated. The results show that the tensile strength and the limiting oxygen index increase with the increase of Mg (OH) 2 / Al (OH) 3 ratio, but the elongation at break decreases. Agent, the limiting oxygen index of the material is proportional to the addition of Mg (OH) 2, while the tensile strength and elongation at break are inversely proportional to the limiting oxygen index. When the addition amount of Mg (OH) 2 is between 40 and 50 , The limit oxygen index of the material can reach more than 29%, and the mechanical properties are superior to those of the Mg (OH) 2 / Al (OH) 3 system.