Mg(OH)_2阻燃热塑性聚烯烃弹性体的研究

Study on Thermoplastic Polyolefin Elastomer Flame Retardant with Mg(OH)_2

采用5种表面处理剂对氢氧化镁(Mg(OH)2)进行表面改性,并以热塑性聚烯烃弹性体(TPO)为基体树脂,制备了TPO/Mg(OH)2阻燃材料。通过氧指数(OI)、垂直燃烧和拉伸性能测试,研究了表面处理剂的种类、Mg(OH)2用量和粒径等对TPO/Mg(OH)2阻燃材料燃烧性能和力学性能的影响。OI测试结果表明,钛酸酯改性的粒径为2μm的Mg(OH)2使体系的OI达27.8%;改性Mg(OH)2用量为70份时成为难燃材料。垂直燃烧测试结果表明,100份改性Mg(OH)2使材料的燃烧等级达到FV-0级,无法引燃。力学性能测试结果表明,钛酸酯改性的粒径为2μm的Mg(OH)2使材料保持较高的应变;70份的Mg(OH)2使阻燃材料的拉伸屈服应力和拉伸断裂应力达到最大值。

The flame retardant composites were prepared with thermoplastic polyolefin elastomer （TPO） served as matrix, and Mg（OH）2 as flame retardant, which was modified with 5 kinds of coupling agents. The influences of different coupling agents, using amount of Mg（OH）2 and the size of particles on the flam-retardant properties and mechanical properties of the composites were studied by means of LOI, Vertical burning test and tensile testing. The OI testing results showed that the LOI of the composites reached to 27.8%, when the particle size of Mg（OH）2 was 2pm which modified with titanate coupling agent. When the using amount of Mg（OH）2 was 70phr, the composite was difficult to burn. The vertical burning test results showed that the composites reached to the scale of burning of FV-0, when the using amount of modified Mg（OH）z was 100phr. The mechanical properties results showed that the higher strain of the composites could obtain, which filled with Mg（OH）2 modified by titanate coupling agent, and the particle size of Mg（OH）2 was 2pm. The tensile yield stress and tensile breaking stress of the composites filled with 70phr Mg（OH）2 reached maximum.