1,3-ジオキサンによる天然ゴムの橋かけ反応

概要

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The cross-linking reaction of natural rubber with 1, 3-dioxan and SnCl2·2H2O was studied. It was found that the cross-linking of natural rubber was obtained using 1, 3-dioxan in the presence of SnCl2·2H2O at 160°C with a molar ratio of 1, 3-dioxan / SnCl2·2H2O at <5.0, the cyclization of rubber was made and as the result the physical properties of vulcanizate was decreased, but in the case of the molar ratio at>5.0, the rubber was softened and its physical properties decreased, because of side reaction to produce 1, 3-propandiol. The optimum condition of cross-linking was 5.0 molar ratio of 1, 3-dioxan / SnCl2·2 H2O. The properties of vulcanized rubber obtained at various conditions were measured. The optimum properties of the cross-linked rubber was obtained at 22 PHR of 1, 3-dioxan (SnCl2·2 H2O 11.3 PHR) in natural rubber.