▎ 摘　　要

NOVELTY - Steering wheel protective layer hard sheath material comprises ammonium paratungstate, graphene oxide, hydrazine hydrate, octamethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane, tetramethyldisiloxane, toluene diisocyanate, butyl acetate, 1-allyl-3-methylimidazole, heavy calcium carbonate, AKD raw powder, dioctyl cinnamate, lithium naphthenate, poly- epsilon -caprolactone diol and sulfuric acid. USE - Used as steering wheel protective layer hard sheath material. ADVANTAGE - The material has high hardness, high impact strength, can absorb driver head and chest and collision energy, and increases safety. DETAILED DESCRIPTION - Steering wheel protective layer hard sheath material comprises 0.6-1 pts. wt. ammonium paratungstate, 10-13 pts. wt. graphene oxide, 20-30 pts. wt. hydrazine hydrate, 5-6 pts. wt. octamethylcyclotetrasiloxane, 2.5-3 pts. wt. trifluoropropylmethylcyclotrisiloxane, 0.8-1 pts. wt. tetramethyldisiloxane, 160-170 pts. wt. toluene diisocyanate, 10-14 pts. wt. butyl acetate, 0.2-0.3 pts. wt. 1-allyl-3-methylimidazole, 13-20 pts. wt. heavy calcium carbonate, 3-5 pts. wt. AKD raw powder, 5-8 pts. wt. dioctyl cinnamate, 0.3-1 pts. wt. lithium naphthenate, 180-200 pts. wt. poly- epsilon -caprolactone diol and 0.1-0.15 pts. wt. sulfuric acid (95-98%). An INDEPENDENT CLAIM is also included for preparing the material, comprising (i) adding heavy calcium carbonate into N,N-dimethylformamide (5-6 times), dissolving by stirring to obtain a dissolution liquid; (ii) adding ammonium paratungstate into 50-60 times of water, stirring at 80-90 degrees C for 7-10 minutes, adding heavy calcium carbonate and graphene oxide, heating to dryness, and drying in vacuum; (iii) adding the mixed material after uniformly grinding into 100-120 times of deionized water, carrying out ultrasonic dispersion for 5-7 minutes, adjusting pH to 10-12, adding dissolution liquid, stirring and mixing for 20-30 minutes, adding hydrazine hydrate, reacting at 76-80 degrees C for 20-24 hours, washing the product with deionized water and acetone in order to neutrality, drying in vacuum to obtain modified graphene; (iv) mixing the above-mentioned product with dioctyl decahydrate and N,N-dimethylformamide (2-3 times), stirring uniformly, adding AKD raw powder, raising temperature to 80-90 degrees C, maintaining heat and stirring for 10-20 minutes, and discharging to obtain ester solution; (v) mixing the above octamethyl cyclotetrasiloxane and tetramethyldisiloxane, stirring at 30-40 degrees C for 20-30 minutes, adding 95-98% concentrated sulfuric acid, raising the temperature to 50-60 degrees C, adding trifluoropropylmethyl cyclotrisiloxane dropwise, stirring while reacting for 4-5 hours, cooling to room temperature, adjusting pH to 6-7, and filtering to obtain fluorine-containing polysiloxane; (vi) taking 5-10% toluene diisocyanate, mixing with ester solution, uniformly stirring, adding lithium naphthenate and preheating at 40-50 degrees C for 30-40 minutes to obtain monomer; (vii) mixing poly- epsilon -caprolactone diol and fluorine-containing polysiloxane, stirring uniformly, adding butyl acetate, stirring the mixture at 60-65 degrees C for 20-30 minutes, and pretreating monomer and residues, adding the modified graphene and the remaining raw materials under agitation condition, reacting for 3-4 hours at 80-85 degrees C with nitrogen gas, filtering and vacuum drying.