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通过喷雾干燥技术制备了一系列无机纳米粒子(凹凸棒土和/或二氧化硅)与有机磷酸盐类成核剂(NA11)复配的复合成核剂.研究了复合成核剂对聚丙烯力学性能与结晶行为的影响.采用透射电镜(TEM)、扫描电镜(SEM)、偏光显微镜(POM)、广角X射线衍射仪(WAXD)等对复合成核剂在聚丙烯中的分散和对结晶行为的影响进行了表征和分析,并且对复合成核剂改性聚丙烯的机理进行了探讨.结果表明,这种复合成核剂对聚丙烯力学性能的改善明显,聚丙烯的刚性迅速增加,其中三元成核剂对聚丙烯刚性的提高更显著,该成核剂在0.2%用量下对聚丙烯力学性能的改善效果,相当于同等添加量下纯NA11的改性效果.微观形态研究表明三元复合成核剂体系中,三组分形成了相互隔离的分散状态,使有机成核剂和无机纳米粒子可以在聚丙烯基体中实现良好分散.
A series of complex nucleating agents were prepared by spray drying technique, which were prepared by mixing inorganic nanoparticles (attapulgite and / or silica) with organophosphate nucleating agent (NA11) Mechanical properties and crystallization behavior of the composite nucleating agent in polypropylene were studied by means of TEM, SEM, POM and WAXD, Behavior of polypropylene was characterized and analyzed, and the mechanism of modified nucleating agent modified polypropylene was discussed.The results showed that this kind of composite nucleating agent improved the mechanical properties of polypropylene significantly, the rigidity of polypropylene increased rapidly, Among them, the ternary nucleating agent enhanced the rigidity of polypropylene more remarkably, the improving effect of the nucleating agent on the mechanical properties of polypropylene at 0.2% was equivalent to the modification effect of pure NA11 under the same adding amount. In the ternary complex nucleating agent system, the three components form a dispersed state separated from each other, so that the organic nucleating agent and the inorganic nanoparticles can be well dispersed in the polypropylene matrix.