有机磷酸盐与硅溶胶复配成核剂对PP性能的影响

利用偏光显微镜(PLM)、光电雾度仪、差热分析(DSC)及力学性能测试考察有机磷酸盐(NA-21)与硅溶胶复配成核荆对均聚聚丙烯(PP)透明性、结晶行为及力学性能的影响.研究结果表明:有机磷酸盐与硅溶胶有良好的协同异相成核作用;复配体系中,纳米微粒的分散性明显好于添加单一纳米成核剂的分散性;硅溶胶的添加量为0.15%,有机磷酸盐的添加量为0.35%时,成核PP的雾度降低到36.3%,结晶温度升高到132℃;与单-NA-21增透PP相比,复配成核荆增透PP的冲击强度与拉伸强度都有明显提高.

Effects of Compound Nucleating Agent of Organic Phosphate and Silicon Sols on Properties of Polypropylene

The effects of compound nucleating agent of organic phosphate and silicon sols on the crystallizing, transparency and mechanical properties of PP were investigated through differential scaning calorimetry ( DSC) , polarizing microscopy ( PLM) , photoelectricity opacimeter and mechanical properties testing. The experimental results showed that the heterogeneous effectiveness of silicon sols was more obvious than nano-SiO_2 because it was good dispersibility in PP matrix. Keeping the concentration of silicon sols as 0. 15 % ,as the concentration of organic phosphorus increased from 0 to 0. 35 % ,the haze of the nucleated polypropylene decreased to and the crystallization peak temperature increased to 132 ℃. Compared with transparent PP by single NA-21 ,the tensile strength and impact strength of transparent PP by composite nucleating agent were obviously increased.