Abstract—
The effect of vulcanization accelerators on the structure and properties of rubbers based on Hydrin T6000 epichlorohydrin rubber was studied. As accelerators, we used mercaptobenzthiazole (MBT) in the amount of 1.5 pts. wt., tetramethylthiuram disulfide (TMTD) in the amount of 0.5–1.5 pts. wt., and N,N'‑diphenylguanidine (DPG) in the amount of 0.5–1.5 pts. wt., which represent a triple system of accelerators. The choice of accelerators is based on the possibility of obtaining a vulcanization spatial structure of different sulfide content: thiuram group accelerators promote the formation of mono- and disulfide bonds; guanidine group, polysulfide bonds; and thiazole group, from carbon-carbon to polysulfide with varying degrees of sulfide. According to the results of the study of physical and mechanical properties, the determination of the parameters of the spatial grid, and the study of the dynamic behavior of rubber, differences were revealed owing to the formation of a spatial structure with different types of crosslinks and density. It is shown that rubber containing 1.5 pts. wt. MBT, 0.5 pts. wt. DFG, and 0.5–1.0 pts. wt. TMTD possess the best set of properties owing to the manifestation of a synergistic effect on the formation of a vulcanization network of a certain density and the ratio of poly-, di-, and monosulfide crosslinks. Thus, the use of a group of accelerators with different functional effects makes it possible to obtain vulcanizates with an optimal set of technological and operational properties.
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Funding
This study was carried out within the framework of the State Assignment of the Ministry of Science and Higher Education of the Russian Federation no. 122011100162-9, FWRS-2021-0004, using the scientific equipment of the Center for Collective Use of the FRC Yakut Science Center, Siberian Branch, Russian Academy of Sciences, grant no. 13, TsKP.21.0016.
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Davydova, M.L., Khaldeeva, A.R., Fedorova, A.F. et al. Choice of Accelerators of the Vulcanization Group for Rubbers Based on Epichlorohydrin Rubber. Inorg. Mater. Appl. Res. 14, 1321–1326 (2023). https://doi.org/10.1134/S2075113323050076
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DOI: https://doi.org/10.1134/S2075113323050076