磷酸金属盐类成核剂调控制备高流动抗冲共聚聚丙烯的研究

Preparation of high-flow impact polypropylene in presence of metal phosphates nucleating agents

考察了金属盐类成核剂TD-531和NA-11对煤基高流动抗冲聚丙烯K7760H的结晶性能、力学性能及熔融指数等的影响。结果表明,成核剂NA-11和TD-531的引入均可以有效促进K7760H的结晶过程,且低浓度下成核效果更加明显;添加250μg/g成核剂TD-531和NA-11时,成核聚丙烯体系的结晶温度分别从空白聚丙烯的121.6℃提升至129.8℃和125.3℃。2种成核剂均可有效改善聚丙烯K7760H的拉伸强度且提升效果相当,而TD-531对弯曲模量的提升效果明显优于NA-11;但2种成核剂均使聚丙烯的冲击强度略有下降。添加成核剂使聚丙烯K7760H的熔融指数略有提高,表明成核剂对聚丙烯的流动性有一定提升作用。

The effects of metal salt nucleating agents TD-531 and NA-11 on the crystallization performance,mechanical properties and melt index of coal-based high-flow impact polypropylene K7760 H are studied.The results show that the addition of both NA-11 and TD-531 can effectively promote the crystallization process of K7760 H,and the nucleation effect is more obvious at low concentration.The crystallization temperature of the nucleated polypropylene system increases from 121.6℃of pure polypropylene to 129.8℃and 125.3℃,respectively when 250μg·g^(-1)of TD-531 and 250μg·g^(-1)of NA-11 is added.Both NA-11 and TD-531 can effectively improve the tensile strength of polypropylene K7760 H,while the improvement effect by TD-531 in flexural modulus is significantly better than that by NA-11.Both NA-11 and TD-531 can make the impact strength of polypropylene reduce slightly.Finally,the addition of nucleating agent slightly increases the melt index of polypropylene K7760 H,indicating that the nucleating agent has a certain effect on improving the fluidity of polypropylene.