Reduced graphene oxide nitrile rubber and method for preparing tooth-scar-free tooth block

A reduced graphene oxide nitrile rubber, comprising the following components in parts by weight:

• 100-140 parts of nitrile rubber, 30-90 parts of reduced graphene oxide nitrile rubber masterbatch, 1.8-2.52 parts of vulcanizing agent, 1.2-1.68 parts of vulcanization accelerator, 5-7 parts of vulcanization activator, 17-23.8 parts of plasticizer, 2-2.8 parts of antioxidant, 59-86.6 parts of filler, 0.1-0.14 part of curing agent and 2-2.8 parts of dichlorophenol;
• wherein, a mass fraction of reduced graphene oxide in the reduced graphene oxide nitrile rubber masterbatch is 30-57%;
• the oxygen content in the reduced graphene oxide is 1.2-1.4%, the carbon content is 98-99%, and the specific surface area is 750-800 m2/g;
• wherein the preparation method of the reduced graphene oxide nitrile rubber masterbatch comprises the following steps;
• dispersing reduced graphene oxide in 1,4-butanediol glycidyl ether dispersant;
• ultrasonically dispersing for 60-90 minutes to obtain a reduced graphene oxide dispersion;
• adding nitrile rubber latex and stirring for 90-120 min to obtain a mixed solution;
• adding the mixed solution above to a mixed liquid of a calcium chloride aqueous solution and ethanol with a volume ratio of 1:2-4 used as a coagulation solution for demulsification, wherein the volume ratio of the mixed solution to the coagulation solution is 2-3:3-5;
• after suction filtration, washing and drying, obtaining a reduced graphene oxide nitrile rubber masterbatch.