The manufacture of green tires with low heat build‐up has attracted extensive attention. Furthermore, the trouble to solve the problem of rubber failure caused by tires dynamic heat build‐up is a great challenge faced by the automotive tire industry. In this article, a method of preparing styrene butadiene rubber/carbon black/aramid pulp‐natural rubber latex (SBR/CB/AP‐NRL) composites was described in detail, which used AP coated with NRL to fill SBR/CB. A flexible interface layer was constructed between fibers and rubber matrix, making for forming a large specific surface area of the NRL. The mechanism of reducing heat build‐up of the rubber composite through “deforming transformation” in the flexible interface layer was discussed. In addition, the NRL interface layer contributed to the dispersion of the AP in the rubber matrix and the good interfacial bonding between AP and the rubber matrix. In the experiment of replacing a part of CB with a certain content of AP‐NRL, it was found that the temperature rise of the rubber composites decreased by 8.33% with 1 phr modified AP replacing 5 phr CB. The strategy of reducing dynamic heat build‐up of rubber composite provides a new idea for the development of green tire.

Natural rubber latex filled with silica can be used to prepare low-cost green tires with low rolling resistance. However, low mixing efficiency and reduction of properties have become the major difficulty in the industry, because there are many polar groups on the surface of silica, and it is difficult to produce a strong interaction with a nonpolar rubber. In this paper, natural rubber latex masterbatch with silica was prepared, and easily mixed with natural rubber (NR) to obtain NR/silica composites. The silica after NRL treated in the rubber matrix characterized with well dispersion, good compatibility with rubber, and composites had weaker Payne effect and higher wet-skid resistance. Meanwhile, the 100% and 300% tensile modulus increased by 8.5% and 14.47%, respectively, notably decreasing heat build-up by 41.88%, compared to the composite prepared by dry mixing technology. Overall, both the dispersion and interfacial adhesion of silica in the rubber matrix have a significant synergistic effect on the properties of rubber composites. The strategy of preparing NR/silica composites provides new research avenues for the preparation of green tires and other rubber industries in the future.

The composites with excellent mechanical, low rolling resistance, and low heat build‐up are the potential materials for preparing green tires. In this study, we prepared silica‐natural rubber latex (silica‐NRL) masterbatch, which improved the processing and dispersion properties of silica in the natural rubber, proved by the rheological properties of composites. Furthermore, the idea of partial replacement of silica with low content modified aramid pulp (AP) for preparing hybrid enhanced natural rubber with high mechanical properties and low heat build‐up was put forward and evaluated the feasibility of this strategy. We find that replacing 5 phr silica with 1 phr AP, the performances of the rubber composites were all superior to the composites with only filled 50 phr silica, and replacing 10 phr silica with 2 phr AP, the mechanical and fatigue property was improved remarkably and dynamic heat generation was reduced the most at same time. The strategy of preparing silica‐NRL masterbatch and partial replacement of silica with AP provides a novel reference for the preparation of low heat build‐up green tire.