POLYMERIZATION METHOD OF POLYETHYLENE AND ETHYLENE COPOLYMER FOR EXTRUSION BLOW MOLDING

摘要

A method for preparing an ethylene polymer or ethylene copolymer for blow molding is provided to obtain an ethylene polymer or ethylene copolymer having excellent melt strength and appearance. A method for preparing an ethylene polymer or ethylene copolymer for blow molding uses two slurry phase polymerization reactors connected in series, wherein a first reactor is for preparing a low-molecular weight polymer and a second reactor is for preparing a high-molecular weight polymer. In the method, a solid complex titanium catalyst is used as a main catalyst, an organoaluminum compound is used as a cocatalyst, and ethyl aluminum sesquichloride is introduced in an amount corresponding to a molar ratio of 0.5-5.0 (aluminum/titanium in the main catalyst), and the main catalyst, cocatalyst and ethyl aluminum sesquichloride are introduced into the first reactor.