Modification of Low-Smoke Halogen-Free Flame Retardant Thermoplastic Polyurethane Elastomer Sheath Material
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摘要: 为研究适用于低烟无卤阻燃线缆的热塑性聚氨酯弹性体(TPU),文中以TPU为基材,选用氢氧化铝(ATH)、二苯基磷酸酯(BDP)为阻燃剂,硼酸锌(ZB)、有机处理蒙脱土(OMMT)为阻燃协效剂,制备出低烟无卤阻燃TPU护套料,并通过垂直燃烧、极限氧指数(LOI)、NBS烟密度仪等手段,研究TPU护套料的阻燃及产烟性能。试验结果表明：表面处理ATH相比未处理ATH具有更高的机械性能;磷酸酯在提高材料阻燃性能的同时,还降低了改性过程对TPU的性能损伤;ZB、OMMT均能提高TPU的阻燃性能,降低材料的烟密度,但与ZB相比,OMMT对阻燃性能与烟密度的改进效果更佳。Abstract: To investigate thermoplastic polyurethane elastomers (TPU) for low-smoke halogen-free flame retardant cables, TPU was prepared by using aluminium hydroxide (ATH) and diphenyl phosphate (BDP) as flame retardants, zinc borate(ZB) and organically modified montmorillonite(OMMT) as synergists. Vertical burning test, limiting oxygen index (LOI) and NBS smoke density test were used to evaluate the performance of TPU sheath material for low-smoke halogen-free flame retardant cables. Results showed that surface treated ATH had higher mechanical properties than the untreated ATH. Phosphate ester improve flame retardant performance of the material, and also reduce performance damage to TPU in the modification process. ZB and OMMT could improve flame retardant performance of TPU, and reduce smoke density of the material, but improvement effect of OMMT on flame retardant performance and smoke density was better than that of ZB.
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