Reducing dynamic heat build‐up of styrene butadiene rubber/carbon black by filling aramid pulp coated with natural rubber latex

Abstract

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.

Hybrid enhancement of silica and aramid pulp on improving performance and reducing dynamic heat generation of natural rubber composites

“…After NRL treated, a flexible interfacial layer was constructed on the fiber surface. The “deformation transfer” is formed 26 . That is, because silica can only be diffused into the interfacial layer and the content of silica in the interfacial layer is low, so that the modulus and the heat build‐up of interfacial layer are lower than rubber matrix, when dynamic deformation occurred in the composite, because the modulus of AP with high length‐diameter ratio is significantly higher than that of the rubber matrix, contributing to the drastic stress concentration on the fiber surface and the greater stress in the fiber interfacial layer than that in the rubber matrix.…”

“…The "deformation transfer" is formed. 26 That is, because silica can only be diffused into the interfacial layer and the content of silica in the interfacial layer is low, so that the modulus and the heat build-up of interfacial layer are lower than rubber matrix, when dynamic deformation occurred in the composite, because the modulus of AP with high length-diameter ratio is significantly higher than that of the rubber matrix, contributing to the drastic stress concentration on the fiber surface and the greater stress in the fiber interfacial layer than that in the rubber matrix. Thus, the deformation of the interfacial layer is increased and the deformation of the rubber matrix is reduced, that is, part of the deformation of the matrix is transferred to the flexible interface layer with lower heat build-up.…”

“…The theory of "deforming transformation" is an novel approach to markedly reduce the heat build-up of rubber composites and it is demonstrated on carbon black/styrene butadiene rubber composites. 26 At present, the silica/NR composite is one of the main materials to prepare "green tires" and its heat build-up is lower than most CB/synthetic rubber, so that it is difficult to further reduce heat build-up of silica/NR composites. In this paper, aiming at improving the processability and dispersion of silica, the natural rubber latex (NRL) was used to treat for silica to prepare silica-NRL masterbatch.…”

“…In the previous study, we used natural latex to treat aramid pulp (AP) which is the fibrillated of aramid fiber with the purpose of constructing a flexible interface layer on the fiber surface, and filled in carbon black/styrene butadiene rubber composites, utilizing “deforming transformation,” effectively enhancing the mechanical properties and reducing the heat build‐up. The theory of “deforming transformation” is an novel approach to markedly reduce the heat build‐up of rubber composites and it is demonstrated on carbon black/styrene butadiene rubber composites 26 …”

A unique coupling agent for elastomer nanocomposites with better carbon black dispersion for higher abrasion resistance and lower rolling resistance

“…The friction between fillers and fillers and between fillers and rubber raise the temperature of the rubber composite. 51,52 Figure 7A shows the heat build-up of carbon black/rubber composites. The heat build-up decreased after the addition of M1, mainly because the polyether long chain was coated on the surface of carbon black, which promoted the dispersion of carbon black, thus reducing the friction between carbon black and between carbon black and rubber chain.…”