Effect of Adding MoDTC on the Properties of Carbon Black Rubber and the Friction and Wear of Metal during Mixing Process.

Yiren Pan,Chuansheng Wang,Lin Zhu,Meng Zhang,Huiguang Bian,Deshang Han,Wenwen Han

doi:10.3390/ma13051071

Yiren Pan, Chuansheng Wang + Show 5 more

Open Access

https://doi.org/10.3390/ma13051071

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Abstract

The gap between the rotor and the mixer chamber wall is an important factor in determining filler dispersion in rubber compounds. The inner wall of a mixer will wear after working for a long time, which will cause poor filler dispersion and affect the quality of rubber products. In this study, MoDTC was added to carbon black as a kind of filler, and the effect on filler dispersion, the properties of the rubber product, and the friction and wear of rubber and metal in the mixing process were examined. Experimental data showed that after adding 3 phr of MoDTC, carbon black dispersion was greatly improved, the curing time was shortened, and the performance remained stable. It was also found that the Mo element of the compound with 3 phr MoDTC dispersed better than that of the other compounds. Most importantly, adding 3 phr of MoDTC greatly reduced the amount of wear on the metal during the mixing process. However, the opposite effect occurred when the MoDTC content was high. The method proposed in this study can not only improve filler dispersion in rubber but also reduce metal wear to prolong the service life of the mixing chamber when applied to an actual mixing process.

Highlights

The gap between the mixer wall and the rotor is an important parameter of mixers, which affects the rubber quality and compound dispersion
Certain amounts of molybdenum dithiocarbamate (MoDTC) were added to the NR (Natural Rubber)/SBR(Polymerized Styrene
According to the determination of elements, it was found that adding 3 phr MoDTC resulted in more easy dispersion in rubber

Summary

Introduction

The gap between the mixer wall and the rotor is an important parameter of mixers, which affects the rubber quality and compound dispersion. Carbon black (CB) has widely been used as a principal reinforcement element in the rubber industry for more than a century [5], and a large amount of carbon black is added to the tire formula to improve tire performance. Other fillers are added or increased in the formula in order to enhance certain characteristics of rubber products according to the product performance requirements [6–8], which will cause friction and wear with the mixer wall [9], as shown in Figure 1 [10]. When the wear reaches a certain extent, the increased clearance between the mixer wall and the rotor will cause uneven dispersion of fillers, which will affect the comprehensive mechanical properties of the rubber.

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Conclusion