The invention discloses a flame-retardant PA6 composite material, a preparation method thereof, a phosphorus-nitrogen flame retardant and a preparation method thereof. The preparation method of the flame-retardant PA6 composite material comprises the following steps: placing dried PA6 at the main feeding port of a twin-screw extruder, placing phosphorus-nitrogen flame retardant and catalyst at the side feeding port, performing melt blending and in-situ reaction of PA6, phosphorus-nitrogen flame retardant and catalyst at an extruder temperature of 220-240°C and a screw speed of 80-85 rpm, and then performing extrusion through a die, cooling and pelletizing to obtain the flame-retardant PA6 composite material; the phosphorus-nitrogen flame retardant is a phosphorus-nitrogen flame retardant with terminal hydroxyl or terminal carboxyl groups. The invention realizes chemical bond connection between the flame retardant and PA6 molecular chains to obtain an intrinsically flame-retardant PA6 composite material, which improves the flame retardancy of the PA6 composite material while reducing the negative impact on the mechanical properties of the flame-retardant PA6 composite material.
Area Code: CN
Application Number: CN202411482556.9
