Batch-type stirrer for suspension polymerization of polyvinyl chloride resin, and batch-type suspension polymerization reactor using same

A batch suspension polymerization method for preparing a vinyl chloride resin, the method comprising performing a reaction by adding a monomer, wherein a batch suspension polymerization reactor for preparing a vinyl chloride resin includes a paddle type agitator having two or more stages of impellers, in the agitator, an angle (pitched angle) of blades of a top impeller is 5 to 20° with respect to an agitator shaft and an angle of blades of the other lower impellers except the top impeller is 0° with respect to the agitator shaft in a vertical direction, and the top impeller of the agitator is disposed in a lower portion of a liquid interface inside the reactor and a position of the top impeller satisfies a relationship between a distance (t) between an upper portion of blades of the top impeller and the liquid interface inside the reactor and a reactor diameter (D) which is t/D=0.22 to 0.3.

An agitator for batch suspension polymerization for preparing a vinyl chloride resin, the agitator comprising:

• a jacket, a baffle, and a reflux condenser, wherein the agitator is a paddle type agitator having two stages of more of impellers, and in the agitator, an angle (pitched angle) of blades of a top impeller is tilted at 5 to 20° with respect to an agitator shaft and an angle of blades of the other lower impellers except the top impeller is 0° with respect to the agitator shaft.