摘要：
In this paper, the silane cross-linking halogen-free flame-retardant polyolefin cable material was easy to absorb water, resulting in poor cross-linking and extrusion.The silane couple was compounded with magnesium hydroxide (MH) and aluminum hydroxide (ATH) flame retardant.Silane crosslinked LLDPE/LDPE/POE halogen-free flame retardant materials were prepared by melt blending.The effects of flame retardant on the processing properties before and after silane treatment and the effects of different ratios of MH and ATH on its mechanical properties, oxygen index and thermal elongation were investigated.The results showed that the surface of the hydroxide flame retardant treated by silane coupling was smoother than that of the untreated extruded composite sheet, and the rheological property was good.There was no pre-crosslinking.At this time, the balance torque dropped by 24.8％, and the melt flow rate increased by 23.5％.With the increased of MH/ATH ratio, the oxygen index and tensile strength of the composites increased firstly and then decreased, but the thermal elongation, permanent deformation rate and elongation at break showed a trend of decreasing firstly and then increased.When the ratio of MH/ATH was 2/1, the composite had the best performance after 8dof water resistance test.The tensile strength reached to 17.5MPa, the elongation at break reached to 349％, the oxygen index reached to 34.2％, the thermal elongation reached 17％, and the permanent deformation rate reached to 3.3％.%针对硅烷交联无卤阻燃聚烯烃电缆料易吸潮, 产生预交联导致挤出性差的问题, 将氢氧化镁 (MH)与氢氧化铝 (ATH)阻燃剂复配后硅烷偶联处理, 采用熔融共混的方式制备了硅烷交联LLDPE/LDPE/POE无卤阻燃材料.重点研究了阻燃剂硅烷处理前后对其加工性能的影响以及MH与ATH不同配比对其力学性能、氧指数、热延伸性能的影响.结果表明氢氧化物阻燃剂经硅烷偶联处理的比未处理的挤出的复合材料片材表面平整光滑, 流变性能好, 没有预交联.此时, 平衡扭矩下降了24.8％, 熔体流动速率提高了23.5％.随着MH/ATH配比的增加, 复合材料的氧指数、拉伸强度呈现出先升高后降低的趋势, 热延伸率、永久变形率、断裂伸长率呈现出先降低后升高的趋势.当MH/ATH配比为2/1时, 经过8d耐水实验, 复合材料性能最佳, 此时的拉伸强度为17.5MPa、断裂伸长率为349％、氧指数为34.2％、热延伸率为17％和永久变形率为3.3％.
