▎ 摘　　要

NOVELTY - Preparing beach umbrella multi-folded rib, comprises (i) taking aluminum, carbon fiber, magnesium, cobalt, copper, lanthanum, nickel, graphene nanosheets, silicon, iron, germanium, yttrium, tin, polypropylene, boron and dimethicone, (ii) preparing copper-coated carbon fiber, (iii) mixing and stirring magnesium, cobalt, lanthanum, nickel, silicon, iron, germanium, germanium, yttrium, tin and boron, smelting, casting and grinding into nano-alloy powder, (iv) dispersing graphene nanosheets into anhydrous ethanol, adopting ultrasonic vibration to fully disperse to form dispersion, then adding nano-alloy powder to it, transferring into a ball mill to obtain slurry, heating, ball milling, drying, (v) mixing slurry with polypropylene and dimethicone, heating, stirring and extruding, (vi) melt-mixing copper-coated carbon fiber and extruded material, pouring into umbrella rib mold and casting, and (vii) coating the surface of the umbrella rib model using umbrella rib surface coating material. USE - The method is useful for preparing beach umbrella multi-folded rib. ADVANTAGE - The method: utilizes carbon fiber into raw material to cooperate with the metal, which increases the anti-oxidation and ductility of the umbrella rib, and improves the tensile strength and hardness of the umbrella rib. DETAILED DESCRIPTION - Preparing beach umbrella multi-folded rib, comprises (i) taking 70-78 pts. wt. aluminum, 14-24 pts. wt. carbon fiber, 1-1.6 pts. wt. magnesium, 0.04-0.12 pt. wt. cobalt, 0.2-0.32 pt. wt. copper, 0.14-0.28 pt. wt. lanthanum, 0.1-0.3 pt. wt. nickel, 0.4-1.2 pts. wt. graphene nanosheets, 0.5-1.4 pts. wt. silicon, 0.2-0.5 pt. wt. iron, 0.3-0.8 pts. wt. germanium, 2.1-2.9 pts. wt. yttrium, 0.02-0.1 pt. wt. tin, 8-16 pts. wt. polypropylene, 0.04-0.12 pt. wt. boron and 2-6 pts. wt. dimethicone, (ii) heating the carbon fiber at 450-500degrees Celsius, maintaining the temperature for 40-60 minutes, naturally cooling to room temperature, then placing the cooled carbon fiber in 64-72 wt.% concentrated nitric acid and stirring for 55-75 minutes, and then placing the carbon fiber in sensitized liquid, sensitizing for 16-24 minutes, then placing the carbon fiber in the activation solution and stirring for 3-6 minutes, then placing the carbon fiber in the reducing solution and stirring for 1-3 minutes and placing under vacuum drying at 100-120degrees Celsius for 3-5 hours, melting the copper, spraying onto the treated carbon fiber and drying to obtain copper-coated carbon fiber, (iii) mixing and stirring magnesium, cobalt, lanthanum, nickel, silicon, iron, germanium, germanium, yttrium, tin and boron in a dry mixer at 300-500 revolutions/minute for 30-50 minutes, stirring uniformly, smelting by vacuum medium frequency induction, casting into ingots, and grinding into nano-alloy powder, (iv) dispersing graphene nanosheets into anhydrous ethanol with a volume of 6-22 times, and adopting ultrasonic vibration for 2-4 hours to fully disperse to form a dispersion, then adding the obtained nano-alloy powder to it, transferring into a ball mill for 12-24 hours to obtain slurry, heating the slurry to 80-100degrees Celsius, continuously ball milling until the absolute ethanol evaporates 82-92%, and then transferring into a blast drying oven and drying at 80-120degrees Celsius for 12-24 hours, (v) mixing slurry treated in step (iv) with polypropylene and dimethicone and stirring at 200-400 revolutions/minute for 1-3 hours, heating at 170-200degrees Celsius, continuously stirring for 15-30 minutes, and then transferring to a twin-screw extruder for extrusion to obtain extruded material, (vi) melt-mixing copper-coated carbon fiber obtained in step (ii) and extruded material obtained in step (v) at 850-900degrees Celsius, pouring into the umbrella rib mold and casting to obtain umbrella rib model, and (vii) coating the surface of the umbrella rib model by using umbrella rib surface coating material, allowing to stand and leveling, baking at 80-240degrees Celsius for 30-60 minutes to obtain finished rib with protective coating.