Method for preparing of polybutadiene

Poly butadiene by minimizing plugging phenomena that occur during manufacture, and increase the conversion rate, a method for manufacturing a polybutadiene capable of improving the productivity is disclosed. A first polymer solution to the production method of the polybutadiene are respectively supplied, and polymerizing the raw material containing the butadiene, the polymerization catalyst and a solvent to a parallel arrangement of two first polymerization reactor to reduce the plugging phenomenon butadiene polymer the first polymerization step is made, and the gas produced by the heat polymerization in the first polymerization reactor is discharged to the condenser; Wherein that first polymerization in series placed in the reactor to at least one second polymerization reactor charge and polymerizing the first polymer solution to prepare a second polymer solution comprising a butadiene polymer, produced by the heat polymerization in the second polymerization reactor, the second polymerization step the gas is discharged to the condenser; And a step of discharging the second polymerization solution.