▎ 摘　　要

NOVELTY - Preparing vulcanizing agent modified graphene particle involves aminating the spherical thermally conductive functional particles. The carboxyl groups and hydroxyl groups on the surface of graphene oxide form chemical bonds with the amino groups on the surface of the spherical thermally conductive functional particles. The graphene oxide is coated on the surface of the spherical thermally conductive functional particles to obtain three-dimensional graphene particles. The vulcanizing agent is adsorbed on the surface of the three-dimensional graphene particles through the pi-pi conjugation by the chemical in-situ deposition process to obtain the vulcanizing agent-modified graphene particles. USE - Method for preparing vulcanizing agent modified graphene particle used in preparing controllable cross-linked natural rubber composite material used as rubber additive (claimed). ADVANTAGE - The vulcanizing agent modified three-dimensional graphene particles effectively regulates and controls the crosslinking density and the crosslinking point position of the filled natural rubber composite material, so that the heat generation, heat conduction and mechanical properties of a natural rubber product are improved, and the service life of the natural rubber product is finally prolonged. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: a. controllable cross-linked natural rubber composite material, which comprises 100 pts. wt. natural rubber, 1-10 pts. wt. vulcanizing agent-modified graphene particles, 11-13 pts. wt. rubber auxiliary, and 0-120 pts. wt. reinforcing filler; b. a method for preparing the controllable cross-linked natural rubber composite material, which involves: i. preparing a dispersion solution from vulcanizing agent modified graphene particles and deionized water, adding natural latex, and uniformly mixing, where the vulcanizing agent modified graphene particles form combined particles with the rubber particles due to the positive ion electrostatic attraction of the protein-phospholipid membranes on the surfaces of the rubber particles and keep the combined particles stable; ii. adding the flocculating agent that reduces the negative charge repulsion among particles which enables the rubber emulsion to be kept stable to generate flocculation, and the rubber particles with the damaged protective layer and the vulcanizing agent modified graphene particles are further adsorbed mutually by pi-pi acting force, so that the combined particles and the rubber particles are orderly aggregated in a water phase and are synergistically precipitated; iii. washing, dewatering and drying the obtained crude rubber to obtain a vulcanizing agent modified graphene master batch; iv. adding natural rubber blocks into an internal mixer, mixing for a certain time at a certain temperature, sequentially adding an anti-aging agent, an antioxidant, an activating agent, a softener and a reinforcing filler, and uniformly mixing to obtain a rubber compound; v. placing the rubber compound into a double roller of an open mill, carrying out open milling at a certain temperature, firstly adding the vulcanizing agent modified graphene master batch, then adding a vulcanization accelerator and a vulcanizing agent, uniformly mixing, and passing the mixture until the rubber material has no bubbles to obtain the rubber compound; vi. allowing the rubber compound to rest for a certain time, and vulcanizing at a certain temperature and pressure for a certain time, so that the rubber molecular chains can form macromolecules with a three-dimensional network structure by taking a vulcanizing agent loaded on the graphene as a crosslinking point, for obtaining the controllable crosslinked natural rubber composite material of the vulcanizing agent modified graphene particles.