The rubber composites with good thermal conductivity contribute to heat dissipation of tires. Graphite filled
natural rubber composites were developed in this study to provide good thermal conductivity. Graphite was
coated with polyacrylate polymerized bymonomers including methyl methacrylate, n-butyl acrylate and acrylic
acid. The ratios between a filler and acrylate polymerization emulsion and those between monomers were
varied. Eight types of surface modification formulas were experimentally investigated. Modification formula
can affect coating results and composite properties greatly. The best coating type was achieved by a ratio of
1:1 between methyl methacrylate and n-butyl acrylate. The coating of graphitewas thermally stable in a running
tire. Filled with modified graphite, the tire thermal conductivity reached up to 0.517–0.569 W·m−1·K−1. In
addition, the mechanical performance was improved with increased crosslink density, extended scorch time
and short vulcanization time.