This invention discloses a method for preparing micro-foamed bio-based plant fiber composite materials for automobiles, comprising the following steps: S1. Drying the resin base, natural fibers, foaming agent, reinforcing agent, silane coupling agent KH560, and foaming aid in a constant temperature drying oven; S2. Mixing the above materials uniformly in a high-speed mixer to obtain pre-treated material A; S3. Extruding pre-treated material A in a twin-screw extruder, and then granulating it using a granulator to obtain composite material masterbatch B; S4. Drying composite material masterbatch B in a constant temperature drying oven until its weight remains constant; S5. Mixing the dried composite material masterbatch B with a foaming agent in a certain proportion in a high-speed mixer to obtain mixture C; S6. Performing foam injection molding of mixture C in an injection molding machine to prepare the required standard test specimens of plant fiber-reinforced resin-based composite material. The method of this invention can effectively solve problems such as high density and low impact strength of composite materials.
Country Code: CN
Application Number: CN202311582649.4
