▎ 摘　　要

NOVELTY - Controllable cross-linked natural rubber of green and efficient one-step reduction and modification of graphene oxide comprises 100 pts. wt. natural rubber, 0-10 pts. wt. sulfide-modified reduced graphene oxide, 11-13 pts. wt. rubber additive, and 0-120 pts. wt. reinforcing filler. The sulfide-modified reduced graphene oxide is prepared by dropping slowly aqueous solution of aqueous-soluble sulfide to the graphene oxide aqueous dispersion, reacting at a certain temperature for a certain period of time, and cooling to room temperature naturally to obtain a sulfide-modified reduced graphene oxide aqueous dispersion. USE - Controllable cross-linked natural rubber of green and efficient one-step reduction and modification of graphene oxide. ADVANTAGE - The controllable cross-linked natural rubber of green and efficient one-step reduction and modification of graphene oxide can effectively improve the crosslinking density and the bonding glue content of the filled natural rubber composite material, and improves the heat conduction performance, the mechanical property and the wear resistance of a natural rubber product. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing controllable cross-linked natural rubber of green and efficient one-step reduction and modification of graphene oxide, which involves: (a)adding sulfide-modified reduced graphene oxide aqueous dispersion in the natural latex, mixing uniformly, so that the sulfide modified reduced graphene oxide particles form combined particle with the natural latex due to the positive ion electrostatic attraction of the protein-phospholipid membrane on the surface of the rubber particle, keeping stable; (b) adding the flocculant, because the negative charge repulsion force between particles which enable the rubber emulsion to keep stable is reduced to generate flocculation; (c) adsorbing mutually the rubber particles with the damaged protective layer and the sulfide modified reduced graphene oxide particle by pi-pi acting force, gathering orderly combined particle and the rubber particle in a aqueous phase; (d) precipitating out in a synergic manner, washing, dewatering, drying the obtained crude rubber to obtain sulfide modified reduced graphene oxide masterbatch; (e) adding the natural rubber block into the internal mixer, mixing for a certain time at a certain temperature, during which an anti-aging agent, an antioxidant, an activator, a softener and a reinforcing filler are added in order, mixing uniformly to obtain mixed rubber; (f) placing the obtained rubber compound into a double roller of an open mill, performing open milling at a certain temperature, adding the obtained sulfide modified reduced graphene oxide master batch; (g) adding a vulcanization accelerator and a vulcanizing agent, mixing uniformly, passing thinly the mixture until the rubber material has no bubbles to obtain the mixed rubber compound; (h) standing the obtained mixed rubber compound for a certain time, and vulcanizing at a certain temperature and pressure for a certain time, so that the rubber molecular chain can become macromolecule with a three-dimensional network structure by taking sulfides loaded on the reduced graphene oxide as crosslinking point to obtain controllable cross-linked natural rubber of green and efficient one-step reduction and modification of graphene oxide.