The invention relates to the technical field of vacuum bag films for aeronautical manufacturing, and discloses an eleven-layer co-extruded film for aeronautical use and a preparation process thereof, and the preparation process specifically comprises the following steps: carrying out
grafting modification treatment on
polyamide acid by using a monoalkenyl diepoxy composite flexible compound through a carboxyl-
epoxy ring-opening reaction to prepare alkenyl functionalized processable
polyimide; the preparation method comprises the following steps: carrying out modification treatment on nylon 6 resin by using 3-
mercaptopropionic acid through an amino-carboxyl
condensation reaction to prepare mercapto functionalized nylon; under the hot melting condition, alkenyl functionalized processable
polyimide and sulfydryl functionalized nylon are induced to be subjected to reactive compounding through a free
radical initiator, PA-PI
alloy master batch is prepared, the master batch serves as a
functional modification component of copolymerized
polyamide 6 / 66 resin, an eleven-layer co-
extrusion film is prepared through an eleven-layer co-
extrusion blow molding process, and the eleven-layer co-
extrusion film is used as a
functional modification component of the copolymerized
polyamide 6 / 66 resin. The film product has excellent comprehensive performance and can be used as a high-temperature-resistant vacuum bag film for curing
aviation composite materials.