环氧氯丙烷橡胶硫化组促进剂的选择

M. Davydova, A. R. Khaldeeva, A. Fedorova, M. Sokolova
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摘要

研究了硫化促进剂对基于Hydrin T6000的环氧氯丙烷橡胶结构和性能的影响。巯基苯并噻唑(MBT),用量为1.5 pts.wt。,四甲基硫脲二硫化(TMTD) - 0.5 - 1.5 pst.wt。以N,N′-二苯基胍(DPG) - 0.5 ~ 1.5 pst.wt为促进剂。,它代表了一个三重加速器系统。促进剂的选择是基于获得不同硫化物含量的硫化空间结构的可能性:硫脲基促进剂促进单、二硫键的形成;胍-多硫化物键,和噻唑基团-从碳-碳到多硫化物具有不同程度的硫化物。根据橡胶的物理力学性能、空间网格参数的确定和动力学行为的研究结果,揭示了由于形成不同类型交联和密度的空间结构而产生的差异。结果表明,橡胶中含有1.5 pst。wt. MBT, 0.5 pst。wt. DFG和0.5 - 1.0 pst.wt。由于TMTD表现出协同效应,形成了一定密度的硫化网络和比例的聚、二、单硫化物交联。因此,使用一组具有不同功能效果的促进剂可以获得具有最佳技术和操作性能的硫化胶。
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Choice of accelerators of the vulcanization group for rubbers based on epichlorohydrin rubber
The effect of vulcanization accelerators on the structure and properties of rubbers based on Hydrin T6000 epichlorohydrin rubber has been studied. Mercaptobenzthiazole (MBT) in the amount of 1.5 pts.wt., tetramethylthiuram disulfide (TMTD) — 0.5 – 1.5 pst.wt. were used as accelerators and N,N’-diphenylguanidine (DPG) — 0.5 – 1.5 pst.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-, disulfide bonds; guanidine — polysulfide bonds, and thiazole groups — 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 due to the formation of a spatial structure with different types of cross-links and density. It is shown that rubber containing 1.5 pst. wt. MBT, 0.5 pst. wt. DFG and 0.5 – 1.0 pst.wt. TMTD due 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 cross-links. 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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