Functionalized graphene oxide nitrile rubber and tooth-scar-free tooth block

A functionalized graphene oxide nitrile rubber,

• comprising the following components in parts by weight:
• 100-140 parts of nitrile rubber, 30-90 parts of functionalized 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 which is a mixture of stearic acid, dibutyl phthalate and tricresyl phosphate with a mass ratio of 1.5-2.5:8-12:4-6, 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 functionalized graphene oxide in the functionalized graphene oxide nitrile rubber masterbatch is 30-57%;
• wherein, a preparation method of the functionalized graphene oxide nitrile rubber masterbatch comprises the following steps:
• dispersing the functionalized graphene oxide in a dispersant;
• ultrasonically dispersing for 60-90 minutes to obtain a functionalized 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 functionalized graphene oxide nitrile rubber masterbatch;
• wherein, the preparation method of the functionalized graphene oxide comprises the following steps:
• adding a graphene oxide and 3-Aminopropyltrimethoxysilane with a mass ratio of 1:2 into an anhydrous ethanol and ultrasonic stirring uniformly;
• heating to 70-80° C. in a water bath and refluxing for 4-6 hours;
• then adding distilled water to the mixture, centrifuging, washing and drying, obtaining Aminated Graphene.