▎ 摘　　要

NOVELTY - Nylon fibers are prepared by (1) adding 12-16 pts. wt. graphene to 5-8 times its volume of 73-75 mass% concentrated sulfuric acid solution, ultrasonically treating, adding 65-68 mass% concentrated nitric acid solution, continuing ultrasonic treatment, stirring at 113-116 degrees C to reflux, cooling, pouring into distilled water, stirring, diluting, allowing to stand for 13-15 hours, filtering, washing precipitate with distilled water, baking at 40-45 degrees C, and drying; (2) modifying graphene to obtain modified graphene; (3) adding modified graphene to saturated ammonia water, stirring, adding zinc nitrate, stirring, warming to 70-80 degrees C, heating and stirring, cooling, allowing to stand, filtering, water-washing, and drying to obtain nano-zinc oxide-modified graphene composite; (4) drying nylon 6, mixing with composite, copper sulfate, and antioxidant, adding p-epoxyethylbenzene and glycerin, extruding, and granulating; and (5) melt-spinning to obtain nylon fibers. USE - Preparation of nylon fibers for down jacket fabrics (claimed). ADVANTAGE - The nylon fibers have high breaking strength and good mechanical properties and better acid and alkali resistance, which improves weather resistance and corrosion resistance of nylon fiber and prolongs its service life. DETAILED DESCRIPTION - Nylon fibers are prepared by (1) adding 12-16 pts. wt. graphene to 5-8 times its volume of 73-75 mass% concentrated sulfuric acid solution, ultrasonically treating at 50-55 kHz for 32-35 minutes, adding equal volume of 65-68 mass% concentrated nitric acid solution, continuing ultrasonic treatment for 40-50 minutes, stirring at 113-116 degrees C to reflux at a speed of 200-230 rpm for 2-3 hours, cooling, pouring resultant into distilled water with 15-20 times its volume, stirring, diluting, allowing to stand for 13-15 hours, filtering, washing precipitate with distilled water, baking at 40-45 degrees C, and drying; (2) modifying graphene to obtain modified graphene; (3) adding 12-16 pts. wt. modified graphene to a volume of 5-7 of saturated ammonia water, stirring at speed of 300-400 rpm for 5-10 minutes, adding 8-12 pts. wt. zinc nitrate, continuing to disperse and stir for 5-10 minutes, warming to 70-80 degrees C, heating and stirring for 1-2 hours, cooling, allowing to stand for 4-6 hours, filtering, washing with distilled water, and drying at 40-45 degrees C to obtain nano-zinc oxide-modified graphene composite; (4) drying 110-120 pts. wt. nylon 6 in an oven at 100-102 degrees C for 12-13 hours, mixing with 16-20 pts. wt. nano-zinc oxide-modified graphene composite, 8-10 pts. wt. copper sulfate, and 10-12 pts. wt. antioxidant in a high-speed mixer, pre-mixing at speed of 1800-2000 rpm for 20-30 minutes, adding 5-10 pts. wt. p-epoxyethylbenzene, 6-8 pts. wt. glycerin, stirring for 1-2 hours, sending to a twin-screw extruder, extruding, and granulating at 230-238 degrees C; and (5) boiling pellets in distilled water for 30-40 minutes, filtering, adding water, boiling, repeating this operation 3-5 times, heating obtained pellets to 245-250 degrees C to melt, and melt-spinning to obtain nylon fibers.