▎ 摘　　要

NOVELTY - Protective sheathing material comprises 0.1-0.2 pts. wt. of butyl acetate, 10-14 pts. wt. of octylphenol polyoxyethylene ether, 0.8-1 pts. wt. of 2-bromo-4-methylphenol, 6-10 pts. wt. of polyvinylidene chloride, 2-3 pts. wt. of potassium silicate, 10-13 pts. wt. of graphene oxide, 170-180 hydrazine hydrate, 20-30 pts. wt. of poly(epsilon-caprolactone), 5-6 pts. wt. of octamethylcyclotetrasiloxane, 2.5-3 pts. wt. of 1,3,5-tris((3,3,3-trifluoropropyl)methyl)cyclotrisiloxane and 0.8-1 pts. wt. of 1,1,3,3-tetramethyldisiloxane. USE - Protective layer sheathing material for steering wheel. ADVANTAGE - The protective layer sheathing material has very good surface strength, flexibility, good weather resistance, can completely meet the cold environment and has long service life. DETAILED DESCRIPTION - Protective sheathing material comprises 0.1-0.2 pts. wt. of butyl acetate, 10-14 pts. wt. of octylphenol polyoxyethylene ether, 0.8-1 pts. wt. of 2-bromo-4-methylphenol, 6-10 pts. wt. of polyvinylidene chloride, 2-3 pts. wt. of potassium silicate, 10-13 pts. wt. of graphene oxide, 170-180 hydrazine hydrate, 20-30 pts. wt. of poly(epsilon-caprolactone), 5-6 pts. wt. of octamethylcyclotetrasiloxane, 2.5-3 pts. wt. of 1,3,5-tris((3,3,3-trifluoropropyl)methyl)cyclotrisiloxane, 0.8-1 pts. wt. of 1,1,3,3-tetramethyldisiloxane, 0.1-0.15 pts. wt. of 95-98 % of sulfuric acid, 0.2-0.3 pts. wt. of 1-allyl-3-methylimidazole chloride, 6-9 pts. wt. of timellitate, 3-4 pts. wt. of calcium hydrogen phosphate, 7-10 pts. wt. of poly(polytetrahydrofuran carbonate) diol, 0.1-0.2 pts. wt. of hexamethylcyclotrisiloxane and 120-130 pts. wt. of toluene diisocyanate. An INDEPENDENT CLAIM is included for a method for preparing protective layer sheathing material which involves: (A) mixing 1-allyl-3-methylimidazole chloride and N, N-dimethyl formamide to obtain mixed solution; (B) mixing 2-bromo-4-methylphenol, trimellitate and anhydrous ethanol; (C) heating mixture at 80-90 degrees C for 3-4 minutes to obtain alcohol solution; (D) mixing calcium hydrophosphate, deionized water, octylphenol polyoxyethylene ether and polyvinylidene chloride; (E) heating mixture at 110-120 degrees C for 4-5 minutes in oil bath to obtain the polymer emulsion; (F) mixing alcohol solution, polymer emulsion and hexamethylcyclotrisiloxane with stirring for 20-30 minutes to obtain the modified polymer latex; (G) modifying graphene with hydrazine hydrate at 76-80 degrees C for 20-24 hours; (H) mixing potassium silicate, de-ionized water and modified graphene, with stirring; (I) drying at 80-90 degrees C until the water is dried; (J) drying at 110-120 degrees C centigrade for 1-2 minutes; (K) mixing octamethylcyclotetrasiloxane, tetramethyl disiloxane and concentrated sulfuric acid with stirring for 20-30 minutes; (L) heating at 50-60 degrees C; (M) dripping 1,3,5-tris((3,3,3-trifluoropropyl)methyl)cyclotrisiloxane; (N) reacting for 4-5 hours; (O) cooling to room temperature; (P) adjusting pH to 6-7; (Q) filtering to obtain fluorine-containing polysiloxane; (R) mixing obtained product with poly(epsilon-caprolactone), poly(polytetrahydrofuran carbonate) diol, 1,3,5-tris((3,3,3-trifluoropropyl)methyl)cyclotrisiloxane and butyl acetate; (S) heating at 60-65 degrees C for 20-30 minutes; (T) adding toluene diisocynate; (U) ball milling mixture (V) reacting for 3-4 hours at 80-85 degrees C; (W) filtering; and (X) drying product in vacuum to obtain desired sheath material.