Polyolefin resin and preparation method and application thereof

The invention discloses polyolefin resin and a preparation method and application thereof. The polyolefin resin comprises a monomeric unit derived from ethylene and at least one alpha-olefin monomeric unit derived from propylene or butane or methyl-1-pentene. The polyolefin resin is polymer, the polydispersity index (PDI) is smaller than 1.5, and the ash content of the polymer is lower than 10 ppm. Monodispersity of the polyolefin resin is good, and performance of the polyolefin resin can be fully achieved. The ash content of the resin is low, transparency of products is good, and anti-ageing capacity is high. The polyolefin resin is suitable for manufacturing products, like battery membrances, with special requirements for product transparency, insulating performance, service life and the like, and is also suitable for serving as an additive to be added into other polyolefin materials to improve product performance. 本发明公开了种聚烯烃树脂及其制备方法与应用。所述聚烯烃树脂，具有衍生自乙烯的单体单元与衍生自选自丙烯、丁烯或甲基-1-戊烯的至少种α-烯烃的单体单元，所述的聚烯烃树脂为聚合物，多分散系数