多段聚合法制备PE基高性能PE/PP合金  

Synthesis of high quality PE/PP in-reactor alloys with PE matrix by multi-stage polymerization

作　　者：傅智盛[1] 范志强[1] 

机构地区：[1]浙江大学高分子科学与工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2005年第4期534-537,共4页Journal of Zhejiang University：Engineering Science

基　　金：国家重点基础研究发展规划资助项目(G1999064803);国家自然科学基金资助项目(20274037).

摘　　要：用高效球形Ziegler-Natta催化剂,通过多段气相聚合的方法制备了一系列聚乙烯/聚丙烯(PE/PP)原位合金.该合金为粒径大且分布窄、流动性好、形貌好的球形颗粒,兼具很好的抗冲性能(67.3～143.9 kJ/m2)和很高的弯曲模量(1 233.6～2 633.5 MPa),所设计的三段聚合工艺(预聚、乙烯均聚和丙烯均聚)所制备的PE/PP合金中的丙烯质量分数范围很宽(8.7%～73.6%).试验发现聚合温度、聚合压力以及氢调都能有效地改变PE/PP合金的组成,其中以改变聚合温度最为有效.聚合条件对合金的机械性能也有很大的影响.抗冲强度随聚合温度的下降而下降,随聚合压力的下降而上升;弯曲模量受聚合温度的影响较小,随聚合压力的下降而大幅度的下降.A series of PE/PP in-reactor alloys-were synthesized using spherical high-yield supported Ziegler-Natta catalyst by gas-phase polymerization. The alloys were spherical particles with good flowablity, high impact strength (67.3-143.9 kJ/m2), high flexural modulus (1233.6-2633.5 MPa). The influence of reaction conditions on the composition and properties of the alloys were studied. The presented process can regulate the propylene mass fraction of the PE/PP alloys in a wide range of 8.7%-73.6% (proportion by weight). It was find that temperature, monomer pressure, and hydrogen can effectively influence the composition and mechanical properties of the alloys.

关 键 词：多段聚合法 制备方法 催化剂 聚乙烯 聚丙烯 原位合金 孔隙率 流动性 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]