| 摘要 |
The method for extrusion of foamed plates made of polystyrene, comprises mixing the molten polystyrene in an extruder, so that the molten polystyrene causes a foaming of the melt after discharging the melt from the extruder. A hydro-fluoro-olefin is used as propellent, where the propellent portion of the hydro-fluoro-olefin is 5-12 wt.% related to the entire used mixture for the extrusion. The total propellent quantity is 15 wt.% related to the entire used mixture for the extrusion. Water and/or carbon dioxide are admixed as co-propellent for adjusting the cell size of the polystyrene foam. The method for extrusion of foamed plates made of polystyrene, comprises mixing the molten polystyrene in an extruder, so that the molten polystyrene causes a foaming of the melt after discharging the melt from the extruder. A hydro-fluoro-olefin is used as propellent, where the propellent portion of the hydro-fluoro-olefin is 5-12 wt.% related to the entire used mixture for the extrusion. The total propellent quantity is 15 wt.% related to the entire used mixture for the extrusion. Water and/or carbon dioxide are admixed as co-propellent for adjusting the cell size of the polystyrene foam foamed with hydro-fluoro-olefin. The water portion is 0-2 wt.% related to the entire used mixture for the extrusion. The carbon dioxide portion is 0-2 wt.% related to the entire used mixture for the extrusion. Acetone is admixed as co-propellent for improving the solubility of the propellent in the melt, where the acetone portion is 0-2 wt.% related to the entire used mixture for the extrusion. A talk is used as nucleating agent, where the talk portion is 0-2 wt.% related to the entire used mixture for the extrusion. An independent claim is included for a method for producing a foamed plate. |
