一种长链支化无规共聚聚丙烯及其制备方法

Long chain branching polypropylene random copolymer and preparation method thereof

Abstract

本发明公开了一种长链支化无规共聚聚丙烯及其制备方法,将β成核剂分散于溶剂中形成第一分散液,与无规共聚聚丙烯混合均匀形成混合物,待溶剂挥发后,通过熔融挤出制得β母料;将长链支化单体和自由基引发剂分散于溶剂中形成第二分散液,与β母料、无规共聚聚丙烯混合均匀并挥发溶剂后,通过熔融反应挤出制得β晶含量≥60%的长链支化无规共聚聚丙烯,其具有较低的熔体流动速率和较高的冲击强度、拉伸强度、断裂伸长率,加工性能和力学性能俱佳,适用于发泡、热成型、薄膜吹塑及挤出涂覆等应用领域。
The invention discloses long chain branching polypropylene random copolymer and a preparation method thereof. The method includes the steps of dispersing a beta nucleating agent in solvent to form first dispersion liquid, evenly mixing the first dispersion liquid with polypropylene random copolymer to form a mixture, obtaining a beta material batch through melting extrusion after the solvent is evaporated, dispersing long chain branching monomers and free radical initiator in solvent to form second dispersion liquid, evenly mixing the second dispersion liquid with the beta material batch and polypropylene random copolymer, and preparing the long chain branching polypropylene random copolymer with the beta crystal content larger than or equal to 60% through a melting reaction and extrusion after solvent is evaporated. The long chain branching polypropylene random copolymer has the low melt flow rate and high impact strength, tensile strength and elongation at break, is excellent in both processing performance and mechanical property, and is suitable for the application fields of foaming, thermal forming, thin film blow molding, extrusion coating, and the like.

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