▎ 摘　　要

NOVELTY - A rubber composition containing grafted modified natural rubber comprises modifier, natural rubber latex, emulsifier, persulfate, reinforcing agent and carboxyl compound. The solid content of the natural rubber latex is 55-65 wt.%. The reinforcing agent is chosen from graphene or its derivative. USE - Rubber composition used for forming pneumatic tire sidewall, tread, bead filler and support rubber. ADVANTAGE - The rubber composition has excellent ozone aging resistance and heat aging resistance, and provides product having improved service life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of rubber composition, which involves (s1) adding the emulsifier, acrylate monomer and reinforcing agent into natural rubber latex, and stirring to obtain mixture (A), (s2) adding persulfate into the mixture, stirring for 15-30 minutes, heat-stirring for 18-22 hours to obtain mixture (B), and (s3) adding carboxyl compound into obtained mixture, solidifying, placing the solidified mixture into drying device, and drying.