有机蒙脱土对乙烯-醋酸乙烯酯共聚物复合材料成瓷性能和阻燃性能的影响

Effects of organic montmorillonite on ceramifiable property and flame retardance of ethylene-vinyl acetate copolymer composites

将有机蒙脱土(OMMT)、硅灰石和磷酸盐玻璃粉添加至乙烯-醋酸乙烯酯共聚物(EVA)中,通过熔融共混的方式制备了可瓷化EVA复合材料。再将此复合材料分别在600、700、800、900和1 000℃下烧蚀30 min,制得了陶瓷化残余物。采用锥形量热仪和热分析(TGA)评价复合材料的阻燃性能和热稳定性能;通过陶瓷化残余物的致密性和弯曲强度的测试来评价复合材料的成瓷性能;采用X线衍射仪(XRD)表征复合材料的插层结构。结果表明:EVA和OMMT之间形成了有序插层结构;复合材料的热分解速率峰值和热释放速率峰值都随OMMT的增加而下降;残余物体积密度和弯曲强度随OMMT含量的增加而提高。

Ceramified ethylene vinyl acetate copolymer(EVA)composites filled with wollastonite,phosphate glass frits and organic montmorillonite(OMMT)were prepared by melt blending.Ceramic residues were formed when these composites were fired at600,700,800,900and1000℃for30min,respectively.Cone calorimeter and thermogravimetric analysis(TGA)were employed to evaluate the flame retardance and thermal stability of the composites,and the density and flexural strength of the residues were tested to evaluate ceramifiable properties of the composites.X ray diffractometer(XRD)was employed to characterize the intercalated structure between EVA and OMMT.Results showed that an ordered interaction structure between EVA and OMMT was formed,and the peak of thermal decomposition rate and the peak of heat release rate decreased with the increased content of OMMT,and the infiltration between ceramifiable fillers was facilitated,which leaded to the improvement in bulk density and flexural strength of the residues and the decreasing in their water absorption.