The invention belongs to the field of polymer materials and relates to a low-density high-rigidity polyamide composite material and a preparation method thereof. The low-density high-rigidity polyamide composite material comprises, in parts by weight, 30-55 parts of polyamide, 10-40 parts of glass fiber, and 10-30 parts of modified hollow glass microspheres; the modified hollow glass microspheres are hollow glass microspheres whose surface is treated with a coupling agent, and the coupling agent is a silane graft coupling agent with butadiene as the skeleton. The preparation method comprises the following steps: first modifying the hollow glass microspheres, then feeding glass fiber into a twin-screw extruder from a side feeding port, feeding the modified hollow glass microspheres into the twin-screw extruder from a side feeding port of the last zone according to weight ratio, mixing other components uniformly and feeding them into the twin-screw extruder from a main feeding port, and performing melt extrusion and granulation to obtain the low-density high-rigidity polyamide composite material. The method of the invention is simple, and the prepared polyamide composite material has good mechanical strength, low specific gravity and excellent glue bonding performance.
Country Code: CN
Application Number: CN202311840272.8
