Tarnish-resistant glass fiber reinforced flame retardant nylon resin composition and preparation method thereof

The invention belongs to the technical field of high-molecular composite materials, and discloses a nylon resin composition and a preparation method thereof. The composition is prepared by using the following components, by weight, 30-60 parts of a nylon 66 resin, 6-20 parts of a nylon 6 resin, 15-30 parts of a glass fiber, 15-17 parts of a flame retardant, 1-3 parts of a synergistic agent and 0.7-1.3 parts of a processing assistant. The preparation method comprises the following steps: adding 30-60 parts of the dried nylon 66 resin, 6-20 parts of the dried nylon 6 resin, 15-17 parts of the processed flame retardant, 1-3 parts of the synergistic agent and 0.7-1.3 parts of the processing assistant into a high-speed mixer, and stirring in the high-speed mixer for 3-5min; adding the obtained uniformly mixed materials into a feeding port of a double screw extruder; and adding 15-30 parts of the dried glass fiber from a lateral feeding port of the double screw extruder , carrying out melt extrusion through the double screw extruder, and granulating to obtain the nylon resin composition. The tarnish-resistant nylon resin composition prepared in the invention has high mechanical properties and a good flame retardation effect.