▎ 摘　　要

NOVELTY - Sheathing material includes 0.6-1 pt. wt. fulvic acid, 0.8-1 pt. wt. dodecyl dimethyl betaine, 10-13 pts. wt. graphene oxide, 20-30 pts. wt. hydrazine hydrate, 170-180 pts. wt. poly- epsilon -caprolactone diol, 5-6 pts. wt. octamethylcyclotetrasiloxane, 2.5-3 pts. wt. trifluoropropyl methyl cyclotrisiloxane, 0.8-0.1 pt. wt. tetramethyldisiloxane, 0.1-0.15 pt. wt 95-98% sulfuric acid, 120-130 pts. wt. toluene diisocyanate, 10-14 pts. wt. butyl acetate, 0.2-0.3 pt. wt. 1-allyl-3-methylimidazolium, 0.1-0.2 pt. wt. divinylbenzene, 2-3 pts. wt. ammonium metaborate, and 10-14 pts. wt. polystyrene. USE - Sheathing material used for crosslinked steering wheel protective layer (claimed). ADVANTAGE - The sheathing material has improved compatibility with polystyrene and polyurethane resin, improves dispersing effect, enhanced stability, and good strength. DETAILED DESCRIPTION - Sheathing material for crosslinked steering wheel protective layer comprises 0.6-1 pt. wt. fulvic acid, 0.8-1 pt. wt. dodecyl dimethyl betaine, 10-13 pts. wt. graphene oxide, 20-30 pts. wt. hydrazine hydrate, 170-180 pts. wt. poly- epsilon -caprolactone diol, 5-6 pts. wt. octamethylcyclotetrasiloxane, 2.5-3 pts. wt. trifluoropropyl methyl cyclotrisiloxane, 0.8-0.1 pt. wt. tetramethyldisiloxane, 0.1-0.15 pt. wt 95-98% sulfuric acid, 120-130 pts. wt. toluene diisocyanate, 10-14 pts. wt. butyl acetate, 0.2-0.3 pt. wt. 1-allyl-3-methylimidazolium, 0.1-0.2 pt. wt. divinylbenzene, 1-2 pts. wt. ricinoleic acid, 2-3 pts. wt. ammonium metaborate, 10-12 pts. wt. dimethyl fumarate, and 10-14 pts. wt. polystyrene. An INDEPENDENT CLAIM is included for preparation of sheathing material comprising adding 1-allyl-3-methylimidazolium chloride into 5-6 times N,N-dimethylformamide (DMF), and stirring to dissolve to obtain solution (i); adding graphene oxide into 100-120 times deionized water, ultrasonicating for 3-5 minutes, adjusting pH to 10-12, adding solution (i), stirring and mixing for 20-30 minutes, adding hydrazine hydrate, reacting at 76-80 degrees C for 20-24 hours, washing product with deionized water and acetone to neutrality, and drying in vacuum to obtain modified graphene; adding polystyrene into 3-4 times DMF, stirring uniformly, adding 30-40% of dimethyl fumarate, heating to 60-70 degrees C with stirring for 10-20 minutes, adding fulvic acid and divinylbenzene, reacting at similar temperature for 2-3 hours, and cooling to obtain crosslinked polystyrene; adding dodecyl dimethyl betaine in 20-30 times deionized water, stirring, adding ricinoleic acid and remaining dimethyl fumarate, placing in 70-80 degrees C water bath, stirring for 20-30 minutes, and cooling to obtain ester emulsion; mixing crosslinked polystyrene and ester emulsion, adding ammonium metaborate, stirring at 100-200 revolutions/minute for 30-40 minutes, dehydrating at 80-90 degrees C to obtain premixed emulsion; mixing octamethylcyclotetrasiloxane and tetramethyldisiloxane, stirring at 30-40 degrees C for 20-30 minutes, adding 95-98% concentrated sulfuric acid, heating to 50-60 degrees C, adding trifluoropropyl methyl cyclotrisiloxane dropwise, stirring to react for 4-5 hours, cooling to normal temperature, adjusting pH to 6-7, filtering to obtain fluorine-containing polysiloxane; and mixing poly- epsilon -caprolactone diol and fluorine-containing polysiloxane with uniform stirring, adding butyl acetate, heating mixture to 60-65 degrees C for 20-30 minutes, adding sequentially toluene diisocyanate and modified graphene with stirring, reacting at 80-85 degrees C for 3-4 hours, adding premixed emulsion and remaining raw materials, stirring at 200-300 revolutions/minute for 4-6 minutes, filtering and vacuum drying to obtain sheathing material.