▎ 摘　　要

NOVELTY - A helmet comprises an outer helmet component and an inner lining component connected to the outer helmet component through a buffer bracket. The outer helmet component is prepared by mixing novolac epoxy resin, catalyst, and polymerization inhibitor, heating, adding solution of polyvinyl butyral and ethanol, and ethyl orthosilicate, reacting, adding dinonylnaphthalene disulfonic acid and mixed solution of 7-dimethyl-6-octenoic acid and acrylic acid, adding aniline and vegetable oleic acid, mixing to obtain a modified phenolic epoxy acrylic resin, preparing wire mesh, mixing acrylonitrile butadiene styrene, modified phenolic epoxy acrylic resin, maleic anhydride-grafted polyethylene, melt-extruding and granulating, laying the prepared wire mesh in the outer helmet mold, heating the extruded mixture to obtain a melt, and injecting the melt into mold. The inner liner is prepared using e.g. granite, quartz, carbonate, sulfate, and graphene, and polylactic acid polymer. USE - Helmet. ADVANTAGE - The helmet has excellent strength, pressure resistance, waterproof property, flame resistance, and radiation resistance, and has inner liner with improved tensile strength, mechanical properties, antibacterial property, and can be prepared by economical method. DETAILED DESCRIPTION - A helmet comprises an outer helmet component and an inner lining component connected to the outer helmet component through a buffer bracket. The outer helmet component is prepared by mixing 80-100 parts pts. wt. novolac epoxy resin, 1-2 pts. wt. catalyst, and 2-4 pts. wt. polymerization inhibitor, heating to 95-100 degrees C, adding 30-40 pts. wt. solution of polyvinyl butyral and ethanol in a weight ratio of 3:1, adding 5-7 pts. wt. ethyl orthosilicate, reacting, adding 2-4 pts. wt. 20 wt.% dinonylnaphthalene disulfonic acid and 20-30 pts. wt. mixed solution of 7-dimethyl-6-octenoic acid and acrylic acid in a ratio of 1:2, heat-preserving at 100-110 degrees C for 2-4 hours, cooling, adding 4-6 pts. wt. aniline and 3-5 pts. wt. vegetable oleic acid, mixing to obtain a modified phenolic epoxy acrylic resin, preparing wire mesh comprising 0.3-0.5 %mass silicon, 0.9-1.2 %mass magnesium, 0.1-0.2 %mass cerium, 0.5-0.7 %mass copper, 0.2-0.5 %mass manganese, 0.015-0.03 %mass titanium, 4-8 %mass zinc, 0.0006-0.0012 %mass boron, 0.025 %mass or less impurities, and remaining aluminum, by heating and melting aluminum ingot, adding magnesium ingot and zinc ingot, stirring and melting, adding cerium, heating to 870-940 degrees C, heat-preserving for melting, adding other components, obtaining an aluminum alloy base liquid, adding a refining agent, re-refining the aluminum alloy liquid by introducing argon gas, slagging, leaving still, adding to a groove, adding a grain refiner to perform on-line grain refining treatment, casting into a round ingot, extruding into thick wire, drawing into an alloy wire, weaving into a wire mesh having a density of 18-24 holes/cm2, mixing 50-60 pts. wt. acrylonitrile butadiene styrene, 20-30 pts. wt. modified phenolic epoxy acrylic resin, 2-5 pts. wt. maleic anhydride-grafted polyethylene, 7-9 pts. wt. flame retardant, 4-6 pts. wt. carbon fiber, 2-4 pts. wt. antibacterial agent, 0.5-1 pt. wt. inorganic filler, 0.5-1 pt. wt. antistatic agent, 0.2-0.4 pt. wt. dispersant, and 0.2-0.4 pt. wt. antioxidant, adding to a twin-screw extruder, melt-extruding and granulating, laying the prepared wire mesh in the middle of the outer helmet mold, stirring and heating the extruded mixture to obtain a melt, injecting the melt into mold at 80-90 degrees C and a back pressure of 6-7 MPa by using an injection pressure of 130 MPa, and pressure-preserving at 65-80 MPa for 0.5-0.9 second. The inner liner is prepared by mixing 20-30 pts. wt. granite, 10-20 pts. wt. quartz, 4-6 pts. wt. carbonate, 2-4 pts. wt. sulfate, and 3-5 pts. wt. graphene, passing into furnace, melting into a melt at a high temperature, ultrasonically oscillating, adding polylactic acid polymer, stirring at a normal temperature through a magnetic stirrer, ultrasonic vibrating to directly spray inorganic fibers through a metal nozzle, applying a layer of sizing agent on the surface of the fiber, depositing onto the receiving roller, passing the fiber composite material with uniform thickness into the oven for segmental drying, leaving still, immersing ultra-high-molecular-weight polyethylene in a concentrated sulfuric acid solution for 10-20 seconds, taking out, washing with water, drying, immersing in a modified graphene oxide solution, for 4-10 minutes, taking out, drying, placing in ethanol vapor for 50-100 minutes, taking out, drying, obtaining modified ultra-high-molecular-weight polyethylene, adding graphene oxide, sodium dodecylbenzene sulfonate, polyethylene glycol octyl phenyl ether, and a dispersing agent, to a mixed solution of cell pulverization or uniform dispersion in ultrasonic system in a mass ratio of 50:1.5:1:15, dripping 3 volume times 9 wt.% water-soluble polyamic acid solution in 0.5-1 hour, producing a sol, leaving the sol still for at least 12 hours, under an inert atmosphere, heating to 300 degrees C at 3 degrees C/minute, heat-preserving for 1-2 hours, heating continuously to 400 degrees C at 7 degrees C/minute, heat-preserving for 2-4 hours, subjecting the product to alkali washing under ultrasonic conditions, ultrasonically cleaning, acid-washing under ultrasonic conditions, drying and smashing, producing modified graphene oxide having a particle diameter of 0.2-0.4 mu m, heating 2-4 pts. wt. nano titanium dioxide, 3-5 pts. wt. silica, 1-3 pts. wt. fumed silica, 2-4 pts. wt. epoxy resin, 0.4-0.5 pt. wt. pentaerythritol stearate, 1-2 pts. wt. stearic acid, 6-8 pts. wt. acrylic acid, and 30-40 pts. wt. modified ultra-high-molecular-weight polyethylene, in a reaction vessel into a molten material, making the inorganic fiber and modified carbon fiber into a network in a weight ratio of 4:1 to obtain a fiber base layer, pouring the molten material the fiber reinforced base layer, by a forming extrusion device, extrusion-molding, and curing.