煤沥青粉填充氯醋/聚氨酯复合材料的研究

以煤沥青粉为填充剂，与氯醋/ 聚氨酯预聚体进行常温溶液共混，合成煤沥青粉填充的氯醋/ 聚氨酯复合材料.研究了不同软化点的煤沥青粉、煤沥青粉平均粒径和质量含量对复合材料力学性能、电性能的影响.通过扫描电镜（SEM）、热失重（TG）测试手段，分析了煤沥青粉的微观颗粒形态对氯醋树脂/聚氨酯复合材料的作用机理，讨论了复合材料的热稳定性.结果表明：质量含量为10%~15 %的高温煤沥青粉可明显提高复合材料的力学、电绝缘性能；煤沥青粉粒径愈小，力学性能愈高；在煤沥青粒径为125 μm时，电绝缘性最佳；该复合材料初始分解温度为190 ℃，终止温度约在610 ℃，具有良好的热稳定性；煤沥青粉的加入同时可起到黑色着色剂与光屏蔽作用.

Study on a new type composite material of P(VC-co-VAC)/PU filled with coal-tar pitch

A coal tar pitch/ poly (vinyl chloride co vinyl acetate,VC co VAC)/polyurethane(PU) composite was obtained by adding coal tar pitch as filling agent to P(VC co VAC)/PU prepolymer. The  influences of the kinds, amounts and particle sizes of coal tar pitch on mechanical and dielectric properties of the composites were studied. Thermal stability was investigated with thermogravity technique(TG) under air. Using scanning electronic microscope(SEM), the granule pattern of coal tar pitch was obtained and  the machanism was discussed. The results show that when weight content of high temperature coal tar pitch is 10%~15% can greatly improve mechanical properties of composites，and the smaller the coal tar pitch particle size, the better the mechanical properties is. When coal-tar pitch partical size is 125 μm, dielectric properties is best.The initial decomposition temperature of composite is 190 ℃ and the termination temperature of composite is 610 ℃. The addition of coal tar pitch has no effect on the thermal stability of composites, and coal tar pitch also has ultra violet light screening action.