Mixing is the most important production process in rubber production and processing. Essentially, mixing is the technique of uniformly dispersing fillers and small materials in raw rubber, which directly determines the performance and durability of rubber products. This study focuses on overcoming the limitations of the batch mixing technique by combining the wet mixing and continuous mixing techniques, such that their advantages complement each other. In addition, this paper proposes a full formula wet mixing technique, wherein wet continuous mixing used full formula of carbon black to resolve the issue of carbon black flying, which occurs due to the small size of carbon black particles and causes pollution in the air and harmful effects in humans. Based on experimental datasets, it can be inferred that there is desirable mutual synergy between the full formula wet process and the continuous mixing technique, which can simplify the process of adding small materials during the mixing process and improve the quality of mixed rubber as well as promote continuous rubber production. Furthermore, the basic physical properties such as tensile and tear and dynamic mechanical properties of the produced rubber are significantly improved compared with those of the rubber produced by conventional mixing.

Carbon black uses nonrenewable resources (e.g., petroleum and natural gas) as raw materials, which not only causes dust pollution, but also has poor wet traction and high-heat generation of rubber. Wollastonite is a polar filler, it requires surface modification to improve its hydrophobicity. In this paper, potassium oleate was introduced as an environment-friendly modifier to decrease the polarity of the wollastonite, and a series of properties of the rubber composites with modified wollastonite replacing different parts of carbon black were studied. The experimental results show that the interfacial contact angle of the modified wollastonite changes from 0 to 51 , resulting in a weaker polarity. When 10 phr POmodified wollastonite were used to replace 10 phr carbon black filled with natural rubber, the processing safety is better, the Payne effect is effectively weakened and the rolling resistance is reduced, the tensile product reached 15573.98, which was 12.95% higher than that of the composites filled with full carbon black, resulting in the best comprehensive properties. This study verified the feasibility of replacing part of carbon black with potassium oleate modified wollastonite to prepare "green tire," reduce the consumption of fossil energy, promote sustainable development, and provide reference for actual industrial production.

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This paper focused on adding a suitable lubrication effect at the interface between the rubber and mixer chamber wall on reducing the surface wear rate of the mixer chamber wall. In the research process, the contact model between the compound and internal mixer chamber wall was simplified to the pin-on-disc experimental model. The experimental results showed that the friction coefficient and the metal surface wear rate of the mixer chamber were reduced (by approximately 24%) by adding an appropriate amount of antifriction agent in the mixing process, while the comprehensive properties of the compound showed an improvement trend. By analyzing the surface elements of the rubber compound, the MoS2 with an anti-wear effect on the surface of the rubber compound can form a lubrication mechanism between the rubber, filler, and mixer chamber wall metal. Combined with the result of the comprehensive properties of rubber, which showed that although the appropriate amount of antifriction agent formed a lubrication protection mechanism between the rubber and the inner mixing chamber wall, the mechanism did not affect the friction behavior required for mixing. The study can effectively enhance the effective friction mixing and reduce the wear and power consumption of the mixing chamber caused by excess friction during the mixing process.