Method for producing expandable polystyrene beads which have excellent thermal insulation properties

A method for producing expandable polystyrene beads comprising: obtaining suspendable homogenous micropellets from a mixed composition prepared by mezclarparticulas graphite with a styrene-based resin and extruding the composition; and carrying out seed polymerization by suspending graphite-containing micropellets in water and anadirun styrene-based monomer and an aromatic hydrocarbon having 6 to 10 carbon atoms seselecciona the group consisting of benzene, toluene, p-xylene, or xylene, m-xylene, ethylbenzene, propylbenzene, and i-propylbenzene, and impregnation by adding a blowing agent, wherein the hidrocarburoaromatico having 6 to 10 carbon atoms is used in an amount of 0.1 to 5% by weight with relational total weight of the expandable polystyrene beads containing graphite that.