A method for preparing a uniformly-cured solid loading tire from a high-modulus graphene oxide/natural rubber composite, raw materials of the high-modulus graphene oxide/natural rubber composite comprising 100 parts by weight of a natural rubber, 40-120 parts by weight of a carbon black, 0.5-5 parts by weight of a graphene oxide, 1-20 parts by weight of an activator, 1-20 parts by weight of a softener, 1-10 parts by weight of an anti-aging agent, 1-10 parts by weight of an antioxidant, 1-20 parts by weight of a vulcanization accelerator, 1-20 parts by weight of a vulcanizing agent, and 1-20 parts by weight of an interface modifying agent;
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- the method comprising:
- (S1) adding deionized water into a graphene oxide slurry, followed by ultrasonic dispersion to obtain a graphene oxide aqueous dispersion;
- (S2) adding the graphene oxide aqueous dispersion obtained in step (S1) into a natural rubber latex followed by stirring to obtain a mixed emulsion;
- adding a flocculant to the mixed emulsion for demulsification to obtain a crude rubber;
- and subjecting the crude rubber to water washing and drying to obtain a graphene oxide/natural rubber masterbatch;
- (S3) subjecting the graphene oxide/natural rubber masterbatch obtained in step (S2) to internal mixing at 110-120° C. in an internal mixer, and sequentially adding the carbon black, the interface modifying agent, the anti-aging agent, the antioxidant, the vulcanization accelerator, the activator, and the softener, followed by internal mixing for 5-12 min to produce a first rubber mixture;
- removing the first rubber mixture from the internal mixer, followed by cooling to room temperature;
- subjecting the first rubber mixture to open milling in an open mill at 50-80° C. for 6-15 min, and adding the vulcanizing agent followed by mixing and mill run until the first rubber mixture is freed of bubbles, so as to obtain a high-modulus graphene oxide/carbon black/natural rubber mixture;
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- pressing the high-modulus graphene oxide/carbon black/natural rubber mixture into a first rubber mixture sheet;
- (S4) subjecting the graphene oxide/natural rubber masterbatch obtained in step (S2) to internal mixing in the internal mixer at 110-120° C., and sequentially adding the carbon black, the interface modifying agent, the anti-aging agent, the antioxidant, the vulcanization accelerator, the activator, and the softener, followed by internal mixing for 5-12 min to produce a second rubber mixture;
- removing the second rubber mixture from the internal mixer, followed by cooling to the room temperature;
- subjecting the second rubber mixture to open milling in the open mill at 50-80° C. for 15-25 min, and adding the vulcanizing agent followed by mixing and mill run until the second rubber mixture is free of bubbles, so as to obtain a high-viscosity graphene oxide/carbon black/natural rubber mixture;
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- pressing the high-viscosity graphene oxide/carbon black/natural rubber mixture into a second rubber mixture sheet;
- (S5) sandwiching the first rubber mixture sheet obtained in step (S3) between two second rubber mixture sheets obtained in step (S4) to form a rubber mixture laminate with a sandwich structure;
- leaving the rubber mixture laminate to stand;
- and processing the rubber mixture laminate into a rubber mixture strip with a sandwich structure, wherein a width of the rubber mixture strip is less than a width of a metal hub of a loading wheel;
- (S6) coating a surface of the metal hub with an adhesive, followed by drying;
- and winding the rubber mixture strip prepared in step (S5) around the surface of the metal hub, wherein a winding thickness of the rubber mixture strip is a design thickness of a rubber layer of the loading wheel;
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- (S7) transferring the metal hub wound with the rubber mixture strip to a mold of the loading wheel, followed by a first vulcanization at a first temperature for a first preset time and a second vulcanization at a second temperature for a second preset time to obtain the uniformly-cured solid loading tire, wherein the first temperature is higher than the second temperature.