▎ 摘　　要

NOVELTY - Modified rubber sealing material comprises 100 pts. wt. nitrile-butadiene rubber, 8-12 pts. wt. mesoporous molecular sieves, 5-9 pts. wt. graphene, 15-25 pts. wt. bentonite-calcium carbonate microspheres, 10-16 pts. wt. superabsorbent polymer (SAP) resin, 8-12 pts. wt. tackifying resin, 1-3 pts. wt. stearic acid, 4-6 pts. wt. N-phenyl-phenyl-beta-naphthylamine, and 1-3 pts. wt. silane coupling agent. The bentonite-calcium carbonate microsphere comprises 50-60 pts. wt. calcium chloride, 50-60 pts. wt. sodium carbonate, and 5-12 pts. wt. sodium dodecylsulfonate. USE - Modified rubber sealing material. ADVANTAGE - The modified rubber sealing material is water-proof, and has high chemical stability, high strength, durability, and re-usability. DETAILED DESCRIPTION - Modified rubber sealing material comprises 100 pts. wt. nitrile-butadiene rubber, 8-12 pts. wt. mesoporous molecular sieves, 5-9 pts. wt. graphene, 15-25 pts. wt. bentonite-calcium carbonate microspheres, 10-16 pts. wt. superabsorbent polymer (SAP) resin, 8-12 pts. wt. tackifying resin, 1-3 pts. wt. stearic acid, 4-6 pts. wt. N-phenyl-phenyl-beta-naphthylamine, and 1-3 pts. wt. silane coupling agent. The bentonite-calcium carbonate microsphere comprises 50-60 pts. wt. calcium chloride, 50-60 pts. wt. sodium carbonate, 5-12 pts. wt. sodium dodecylsulfonate, and 5-12 pts. wt. polyacrylamide. An INDEPENDENT CLAIM is included for a method for preparing a modified rubber sealing material, which involves: (A) adding 1-4 pts. wt. surfactant polyether P123 into distilled water, and adding mesoporous molecular sieves to obtain a mixed solution; (B) adding 1-2 molar hydrochloric acid solution to the mixed solution, adding 8-12 pts. wt. of 1-8 wt.% aqueous solution of graphene oxide, stirring for 2-3 hours, subjecting to aging and filtering, and drying in a vacuum oven to obtain a graphene-modified mesoporous molecular sieve; (C) preparing calcium chloride solution, sodium carbonate solution, sodium dodecylsulfonate solution, and aqueous polyacrylamide solution, where calcium chloride solution and calcium carbonate solution have the same concentration, that is 0.1-0.3mol/L, the molar concentration of the aqueous polyacrylamide solution is 1-3%, and the molar concentration of the aqueous polyacrylamide solutionis 10-20 mmol/L; (D) adding deionized water to bentonite, stirring uniformly, adding polyacrylamide aqueous solution along with stirring, and stirring uniformly at a temperature of 30-40 degrees C; (E) adding sodium dodecyl sulfate aqueous solution to the calcium chloride solution to obtain a mixed solution, subjecting to ultrasonic stirring at a temperature of 15-20 degrees C for 0.5-2 hours, adding sodium carbonate solution along with continued stirring for 2-4 hours, washing the mixture with deionized water, and drying to obtain bentonite-calcium carbonate microspheres, where the calcium chloride solution, sodium carbonate solution, sodium dodecylsulfonate aqueous solution, and aqueous polyacrylamide solution are in the volume ratio of 10:10:(1-3):(1-3); (F) mixing the graphene-modified mesoporous molecular sieve with the bentonite-calcium carbonate to obtain a bentonite-microsphere filler; (G) adding nitrile rubber, stearic acid, and N-phenyl-beta-naphthylamine to the mixer, and mixing at a controlled temperature of 100-140 degrees C for 3-8 minutes, adding the silane coupling agent and mixed filler, and performing kneading at a temperature of 140-180 degrees C for 60-90 minutes to obtain a kneaded mixture, which is placed in an open mill for cooling; (H) heating the mixture, and filtering through a plastic filter of 80-100 mesh obtain masterbatch; (I) adding the kneaded mixture into a kneader, adding tackifying resin, and kneading in a kneading chamber at a controlled temperature of 70-80 degrees C for 15-30 minutes, kneading with SAP resin for 40-90 minutes at a controlled temperature of 125-150 degrees C, dropping down the temperature of the kneading machine to 70-80 degrees C, and continuing kneading mixing for 20-30 minutes; and (J) discharging the kneading mixture by the lower part of the kneading machine screw, which is then subjected to filtering and nesting.