云母粉对水镁石基阻燃剂/混合塑料复合材料性能的影响

Effects of Modified Mica on the Properties of Brucite-matrix Flame Retardant/EVA Composites

以水镁石、多聚磷酸、十二胺为主要原料,对水镁石颗粒进行表面改性制备水镁石/多聚磷酸胺复合阻燃剂,与改性的云母粉混合后填充于混合塑料。通过扫描电镜、力学性能测试、热重分析、极限氧指数测试、UL94测试等表征手段考察了改性云母粉对复合材料的阻燃性能与力学性能的影响。研究结果发现改性后的云母能够均匀的分散在基体中,当复合阻燃剂质量分数为46%,改性云母粉的质量分数为4%,混合塑料的质量分数为50%时,复合材料的拉伸强度为9.96MPa、断裂伸长率为637.3%及LOI为33.2,达到UL94 V-0级别。

Brucite/ammonium polyphosphate composite particles were synthesized from brucite,Polyphosphoric acid anddodecylamine by layer-by-layer coating method.Furthermore,modified mica was employed to enhance the mechanical properties by physical mixing with brucite/ammonium polyphosphate/mixed plastic composite.The flame-retardant resistance and thermal stability were evaluated by the rmogravimetry（TG）,limiting oxygen index（LOI） and UL94 rating test.When the mass ratio of flame retardant,modified mica,mixed plastic are 46∶ 4∶ 50,the tensile strength,the elongation at break,the LOI are 9.96 MPa,663.7%,33.2,respectively.The UL94 rating of the composites can be in accordance with the level of UL94V-0.