The present invention discloses a method for preparing heat-insulating expanded polystyrene particles, falling within the field of foamed materials technology. The method comprises the following steps: Weighing raw materials according to the following weight ratios: polystyrene 100 parts, modified silica 8-10 parts, smoke suppressant 2-3 parts, foaming agent 5-6 parts; Mix all raw materials and blend using a high-speed mixer for 10 minutes, then pelletize using a twin-screw extruder; After pelletization, perform foaming extrusion using a single-screw extruder to obtain expanded polystyrene particles. This invention achieves excellent thermal insulation with minimal addition by incorporating modified silica into the raw materials. The modified silica consists of hollow silica microspheres grafted with organic molecular chains on their surfaces. Additionally, the grafted molecular chains contain phosphate ester groups, which function as flame-retardant components. Introducing these alongside the nano-silica into polystyrene effectively enhances the polystyrene's flame-retardant properties, broadening the application scope of expanded polystyrene.
Country Code: CN
Application Number: CN202211109486.3
