Method for producing polystyrene extruded sheet profiled bar through carbon dioxide foaming agent

The invention discloses a method for producing a polystyrene extruded sheet profiled bar through a carbon dioxide foaming agent. The method includes the following steps: taking a polystyrene melt as the main component, and taking carbon dioxide as a polymer melt of the foaming agent, and simultaneously adding the two objects into an extruder according to a certain proportion to form a polymer melt; injecting carbon dioxide from the middle section of the extruder to the melt through a foaming agent injection system to form foamable gelatin; along with the forward conveying of the melt, and under the shearing action of a screw, fully mixing the foaming agent with the polystyrene melt; performing mixing and temperature reduction and cooling to the polymer melt through a heat exchanger, so as to reduce the temperature of the gelatin to the optimal foaming temperature; extruding the cooled gelatin through a die with required shapes to form the polystyrene extruded sheet profiled bar. The method for producing the polystyrene extruded sheet profiled bar through the carbon dioxide foaming agent, provided by the invention, is economic and environment-friendly, is simple in technology, and has excellent market prospect.