This study proposes that the foaming pre‐dispersion technology is combined with the gas‐phase‐assisted spray technology, and a foaming agent potassium oleate is introduced. The volume expansion power generated by the bubbles promotes the dispersion of the filler. The uniformity of foaming promotes the chemical bridging of potassium oleate between rubber and silica. Then, with a large velocity difference between the compressed air and the emulsion, the gas‐phase‐assisted spray gun refines the emulsion and breaks the filler aggregates. Next, the atomized droplets splash on the surface of the high‐temperature roller, and then deposit on it to achieve instant drying, which reduces the loss of non‐rubber components, thereby improving the preparation efficiency and comprehensive properties of masterbatch. The Payne effect of the composite prepared by the FGS technology is weaker. The tensile strength, elongation at break, and tensile product of the vulcanizate prepared by the FGS technology with 7 phr PO have increased by 9%, 5%, and 15%, respectively, and the aging coefficient is 23% higher than that of the dry mixing.
The drying process of natural rubber latex significantly affects the structure of the raw rubber network and vulcanizate crosslinking network, resulting in various anti-aging performances. In the present study, a microwave generator was used as an efficient source of clean energy; potassium oleate was introduced as a foaming agent to increase the porosity and water loss channel of the latex system. Aiming at dehydrating and drying natural rubber latex efficiently, an aging resistant rubber composite was prepared. Meanwhile, the mechanism of the foaming agent-assisted microwave drying process on the raw rubber network and the cross-linking network was studied. The experimental results show that the prepared rubber using by this process has higher plastic retention and fluidity. Moreover, it contains more non-rubber components (e.g. protein and acetone extract) and better network structure of raw rubber and vulcanized rubber. It is found that applying this process increases the tensile product by 13.5% and the retention rate of the tensile product after aging by 15.3 times. This process is important for the development of the rubber industry in the direction of green environmental protection, energy conservation, and high efficiency.
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.